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JP2007124200

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This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
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DESCRIPTION JP2007124200
An object of the present invention is to reduce the number of parts for mounting a piezoelectric
diaphragm and to maintain an appropriate contact state between the piezoelectric diaphragm
and a hollow portion. SOLUTION: A piezoelectric diaphragm 11 having a piezoelectric element
11b formed on one side of a flat plate 11a, a housing 50 (75) of the electronic device 10 and a
cover body 20 having a cavity 21 resonating with the piezoelectric diaphragm. Mounting
structure 90 for holding the piezoelectric diaphragm between the housing and the cover as a
connecting structure 91 for connecting the housing and the cover together. The configuration is
such that the facing portions 26 and 92 are formed in such a positional relationship that the
movement of the housing and the cover body in the direction away from each other is prevented.
[Selected figure] Figure 7
Mounting structure of piezoelectric diaphragm
[0001]
The present invention relates to an attachment structure in the case of attaching a piezoelectric
diaphragm to a housing of an electronic device.
[0002]
The piezoelectric diaphragm is generally stored in a case body for generating resonance and
circulated as an electronic buzzer.
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1
The case body has a cylindrical portion whose one end is closed and the other end is open, and a
piezoelectric diaphragm is attached to the open end side so as to cover and close the open end,
and a sound is transmitted to the closed end side. A sound emitting hole is formed. And when
attaching such a piezoelectric diaphragm to an electronic device, it is screwed to the case wall
surface of an electronic device using the screw penetration hole of the attachment seat provided
in the outer periphery of the case body (for example, patent) Reference 1). Japanese Utility Model
Application Publication No. 4-78895
[0003]
However, in the above-mentioned prior art, when attaching to an electronic device, a set screw is
required, and there is a problem that the number of parts increases. Furthermore, there is a
problem that screwing work is required, and the mounting work is complicated. Further, in the
above-mentioned prior art, the case body may be bent due to the fastening of the screw, and as a
result, the contact state between the cylindrical portion of the case body and the piezoelectric
vibration plate fluctuates, for example, the planned sound pressure is not obtained. Etc, there was
a possibility that sound would not be emitted properly.
[0004]
An object of the present invention is to reduce the number of parts required for mounting a
piezoelectric diaphragm. Another object of the present invention is to simplify and facilitate
attachment work of a piezoelectric diaphragm. Furthermore, another object of the present
invention is to maintain a proper contact state between a piezoelectric diaphragm and a
configuration for causing resonance.
[0005]
The invention according to claim 1 is a piezoelectric vibrator for holding a piezoelectric vibrating
plate having a piezoelectric element formed on one side of a flat plate between a housing of an
electronic device and a cover body having a hollow portion resonating with the piezoelectric
vibrating plate. It is an attachment structure of a diaphragm, and the housing and the cover are
mutually connected by the sliding operation of the cover on each of the housing and the cover as
a connecting structure for connecting the housing and the cover to each other. The configuration
is such that an opposing portion is formed in a positional relationship that prevents movement in
the direction of separation.
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[0006]
In the above configuration, the piezoelectric diaphragm is attached by connecting the cover body
to the wall surface of the case using the connection structure portion in a state where the
piezoelectric vibration plate is disposed between the wall surface of the case and the cover body.
The connection structure portion is configured to include an opposing portion formed on the
housing side and an opposing portion formed on the cover body side. At the time of installation
work, when the cover body is slid from the state where the opposing parts do not face each
other, they are in the state of facing each other, and when trying to move the cover body away
from the housing, It has become. That is, the facing portion of the housing is positioned in the
separation direction of the facing portion of the cover body. Thus, the cover body is not
separated from the housing unless the cover body is operated in the direction opposite to the
slide operation direction, and the connected state is maintained. The sliding operation direction
preferably does not coincide with the direction in which the cover body and the housing are
separated, and more preferably the direction orthogonal to the separated direction. Furthermore,
it is desirable that the sliding operation direction be a direction in which the cover body is slid
along the wall surface of the housing. Further, the slide operation direction is not limited to the
linear direction, and may be a curved direction or a rotational direction.
[0007]
The invention according to claim 2 has the same configuration as the invention according to
claim 1, and at least one of the facing portions of the housing or the cover body has an inclined
surface inclined with respect to the sliding operation direction of the cover body. The
composition is taken. In the above configuration, by providing the inclined surface at the
opposing portion of at least one of the housing and the cover body, the transition from the nonopposing state to the opposing state is smoothly performed along the inclined surface by the
slide operation. The inclined surface is preferably inclined so as to guide the opposing portion of
the other member in such a positional relationship as to prevent movement of the housing and
the cover in the direction in which the housing and the cover separate from each other.
[0008]
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The invention according to claim 3 has the same configuration as the invention according to
claim 1 or 2 and, as a connecting structure, the cover or the case moved to at least one of the
case or the cover by a sliding operation. The structure which forms the stopper which prevents
the return movement of the opposing part is taken. In the above configuration, by providing a
stopper on at least one of the housing and the cover, the movement of the facing portion on the
cover or the housing side from the facing state to the non-facing state is restricted, and the cover
is mounted on the housing The state is maintained.
[0009]
The invention according to claim 4 has a configuration similar to the invention according to any
one of claims 1 to 3, and a contact portion brought into pressure contact with the piezoelectric
diaphragm in a state where the housing and the cover body are connected. Is provided on both
the housing and the cover body. In the above configuration, since the contact portion pressed
against the piezoelectric diaphragm is provided on both the housing and the cover, the
piezoelectric diaphragm is held between the housing and the cover in a sandwiched state, and
stable holding is achieved. It will be.
[0010]
The invention according to claim 5 is a piezoelectric vibrator for holding a piezoelectric vibrating
plate having a piezoelectric element formed on one side of a flat plate between a housing of an
electronic device and a cover body having a hollow portion resonating with the piezoelectric
vibrating plate. An attachment structure of a diaphragm, including a connecting structure for
connecting a housing and a cover to each other, wherein the cover comprises a plurality of platelike parts integrally formed, and any one adjacent to each other The structure which provides the
reinforcing rib integrally formed with the said each plate-like part in the boundary of the platelike-part is employ | adopted.
[0011]
In the above configuration, the piezoelectric diaphragm is mounted by connecting the cover to
the housing using the connection structure portion in a state where the piezoelectric diaphragm
is disposed between the wall surface of the housing and the cover.
And by the reinforcement rib being provided in the boundary of two adjacent plate-like parts
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among a plurality of plate-like parts which constitute a cover body, the crossing angle of at least
those plate-like parts is maintained by a reinforcement rib Ru. Therefore, even when an external
force is applied when the cover is attached to the housing, the occurrence of bending or
distortion is suppressed, and thereby, the contact between the hollow portion and the
piezoelectric diaphragm at the time of attachment of the cover. State fluctuations or anomalies
are suppressed. The reinforcing rib is a flat plate-like structure facing in a direction intersecting
with any of the two plate-like portions, and is perpendicular to or close to both of the two platelike portions. Is desirable.
[0012]
The invention according to a sixth aspect comprises the same configuration as the invention
according to the fifth aspect, and the cover body is bent as a plate-like part at a leg extending to
the housing side and a tip of the leg. The structure has a configuration in which a reinforcement
rib is provided between the leg portion and the engagement portion. In the above configuration,
the leg portion of the cover body is directed to the housing side, and the cover body is coupled to
the housing by the engagement portion formed at the tip thereof. And since a reinforcing rib is
provided between the leg portion and the engaging portion, bending and deformation of the leg
portion and the engaging portion are suppressed at the time of connecting work between the
cover body and the housing and further after connection. The fluctuation or abnormality of the
contact state between the hollow portion and the piezoelectric diaphragm is suppressed.
[0013]
The invention according to claim 7 has the same configuration as the invention according to any
one of claims 1 to 6, and the cover body is a small diameter cylindrical portion forming a hollow
portion, and one end of the small diameter cylindrical portion A circular flat plate portion facing
the piezoelectric diaphragm and having a sound output hole, a large diameter cylindrical portion
surrounding the piezoelectric diaphragm, and an annular flat plate portion connecting the
respective cylindrical portions are integrally formed. A configuration is adopted in which a
reinforcing rib formed integrally with the small diameter cylindrical portion and the annular flat
plate portion is provided on the outer side and at the boundary between the small diameter
cylindrical portion and the annular flat plate portion.
[0014]
In the above configuration, since the reinforcing rib is provided between the small diameter
cylindrical portion and the annular flat plate portion, bending and deformation of the small
diameter cylindrical portion and the annular flat plate portion are further performed at the time
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of connecting the cover body and the housing. Is suppressed, and fluctuation or abnormality of
the contact state between the hollow portion and the piezoelectric diaphragm is suppressed.
[0015]
The invention according to claim 8 has the same configuration as the invention according to
claim 7, and the large diameter cylindrical portion and the annular flat plate are provided inside
the cover body and at the boundary between the large diameter cylindrical portion and the
annular flat plate portion. The structure of providing the reinforcing rib integrally formed with
the part is adopted.
In the above configuration, since the reinforcing rib is provided between the large diameter
cylindrical portion and the annular flat portion, the deflection of the large diameter cylindrical
portion and the annular flat portion is further performed at the time of connecting the cover
body and the housing. The deformation is suppressed, and the fluctuation or abnormality of the
contact state between the hollow portion and the piezoelectric diaphragm is suppressed.
[0016]
According to the first aspect of the present invention, facing portions integrally formed on each
of the cover body having a cavity portion for causing resonance and the housing are provided,
and the housing and the cover body are connected by each facing portion. Since the piezoelectric
diaphragm is held, it is possible to eliminate the need for a set screw and reduce the number of
parts as in the prior art.
Further, since the cover body serves as both the means for generating resonance and the means
for holding the piezoelectric diaphragm, the number of parts can be further reduced.
Furthermore, since the cover body is attached to the housing by the connecting structure by the
slide operation of the cover body, it is possible to eliminate complicated work such as screwing
and simplify and speed up the attachment work of the piezoelectric diaphragm. It becomes
possible.
[0017]
According to the second aspect of the present invention, since at least one of the facing portions
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of the housing or the cover body has an inclined surface, the transition from the non-facing state
to the facing state is smoothly performed by the slide operation. It is possible to further simplify
and smooth the installation work of
[0018]
In the invention according to claim 3, since the stopper is provided on at least one of the housing
and the cover body, the movement of the cover body or the facing portion on the housing side to
the non-facing state is restricted, and the cover for the housing It is possible to maintain the
wearing state of the body, maintain the holding state of the piezoelectric diaphragm, and
suppress accidental detachment.
[0019]
In the invention according to the fourth aspect, since the contact portion is brought into pressure
contact with the piezoelectric vibrating plate in the connected state of the case and the cover
body, the piezoelectric vibrating plate is held between the case and the cover body. The
diaphragm can be held.
[0020]
According to the fifth aspect of the invention, since the reinforcing rib is provided at the
boundary between the plate-like portions adjacent to each other in the cover body, each plate is
subjected to an external force even when the cover body is attached to the housing. The crossing
angle of the protuberances is maintained by the reinforcing ribs to suppress the occurrence of
bending or distortion of the cover body.
Therefore, the variation or abnormality of the contact state between the hollow portion and the
piezoelectric vibrating plate during attachment of the cover body is suppressed, and the proper
contact state between the hollow portion and the piezoelectric vibrating plate is maintained. It
becomes possible to make the occurrence favorable and appropriate.
[0021]
According to the sixth aspect of the invention, since the reinforcing rib is formed between the leg
portion and the engaging portion of the cover body which connects the cover body and the
housing, at the time of connecting the cover body and the housing Deflection and deformation
between the leg and the engaging part after connection are suppressed, and the proper contact
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state between the cavity and the piezoelectric diaphragm is maintained more effectively, and
generation of sound by resonance of the piezoelectric diaphragm is better Can be done properly.
[0022]
According to the seventh aspect of the invention, since the reinforcing rib is formed between the
small diameter cylindrical portion and the annular flat plate portion of the cover body, the small
diameter cylindrical portion and the annular shape at the time of and after the connection
operation of the cover body and the housing Deflection and deformation with the flat plate can
be suppressed, and the proper contact between the cavity and the piezoelectric diaphragm can
be maintained more effectively, and sound can be generated better and properly by resonance of
the piezoelectric diaphragm. It becomes.
[0023]
In the invention according to claim 8, since the reinforcing rib is formed between the large
diameter cylindrical portion and the annular flat portion of the cover body, the large diameter
cylindrical portion at the time of and after the connection operation of the cover body and the
housing Deflection and deformation of the flat plate portion and the annular flat plate portion are
suppressed, and a proper contact state between the cavity portion and the piezoelectric
diaphragm is maintained more effectively, and sound generation by resonance of the
piezoelectric diaphragm is performed better and properly. Is possible.
[0024]
(Overall Configuration of Fire Alarm) A fire alarm 10 according to an embodiment of the present
invention will be described with reference to FIGS. 1 to 12.
FIG. 1 is a perspective view showing the front side of the fire alarm 10, FIG. 2 is a perspective
view showing the back side, and FIG. 3 is an exploded perspective view.
The fire alarm 10 is installed on the ceiling or wall of a building indoors, and performs alarm
notification by sensing smoke generated by a fire.
Here, in the following description, when installing the fire alarm 10, the surface facing the plane
or wall of the ceiling of the building is the back of the fire alarm 10, and the opposite surface is
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8
the front of the fire alarm 10. I assume.
In the following description, the direction toward the front side is referred to as the front, and the
direction toward the back side is as the rear.
[0025]
As shown in FIG. 3, the fire alarm 10 is based on the smoke sensing means 45 (see FIG. 6) for
sensing smoke at the time of fire occurrence, the dark box 30 for storing the smoke sensing
means 45, and the smoke sensing means 45. A circuit board 40 mainly composed of a circuit for
sounding the piezoelectric diaphragm 11, a housing 50 incorporating the above-described
components, and a mounting structure 90 for mounting the piezoelectric diaphragm 11 in the
housing 50 There is.
Hereinafter, each part will be described in detail in order.
[0026]
(Case) FIG. 4 is a cross-sectional view of the fire alarm 10 taken along line X-X shown in FIG. The
housing 50 will be described based on FIGS. 1 to 4. As shown in FIGS. 3 and 4, the case 50
mainly includes a circular base body 60 located on the back side, a circular case cover 70 located
on the front side, the base body 60 and the case cover 70. And a partition plate 75 for dividing
the inside of the housing 50 into two sections on the front side and the back side.
[0027]
The housing cover 70 has a circular front portion 71, a cylindrical portion 72 forming a side wall
surface extending from the peripheral portion of the front portion 71, and a substantially
cylindrical convex portion 73 provided at the central portion of the front portion 71. , Which are
integrally molded of a white resin material. The convex portion 73 is disposed concentric with
the front portion 71 and has a plate-like top plate 73a having a diameter smaller than that of the
front portion 71, and four ribs 73b connecting the top plate 73a and the front portion 71. And.
04-05-2019
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[0028]
Four ribs 73b are provided at uniform intervals in the peripheral portion of the top plate 73a,
and a wide opening is provided between the ribs 73b. As shown in FIG. 4, since the dark box 30
for storing the smoke sensing means 45 is disposed inside the convex portion 73, by making the
space between the ribs 73b an opening 73c, the smoke is made in the dark box 30. The structure
is easy to guide.
[0029]
The top plate 73a is provided with an operation display portion 73d which is a circular through
hole at the center position thereof. The light guide member 12 for transmitting the red light of
the LED 41 provided on the circuit board 40 described later is fitted in the operation display
portion 73 d so that the transmitted red light is emitted toward the front side. It has become.
[0030]
The central portion of the front surface portion 71 of the housing cover 70 is opened with
substantially the same size as the top plate 73 a of the convex portion 73, and the dark box 30 is
disposed in a loosely inserted state. Furthermore, at one end of the front surface portion 71, a
button input portion 71a which is configured as a separate member and supported to be pushed
backward is provided. The button input unit 71a is in contact with a test push button (not shown)
mounted on the circuit board 40 located on the back side, and pushing the button input unit 71a
backward allows the test push button to be pressed. It is possible to perform input operation. The
test push button is for testing the operation confirmation of the piezoelectric diaphragm 11, and
the circuit of the circuit board 40 causes the piezoelectric diaphragm 11 to sound regardless of
smoke detection when input operation is performed. It is configured. Reference numeral 71c
denotes an input string connected to the back side of the button input unit 71a. By pulling this
input string 71c, it is possible to press the test push button via the button input unit 71a. There
is.
[0031]
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10
Further, in the front part 71, at a position opposite to the button input part 71a with respect to
the convex part 73, an alarm output part 71b consisting of a plurality of slits formed through the
front part 71 is provided. There is. The piezoelectric diaphragm 11 is disposed in the vicinity of
the alarm output unit 71b in the housing 50, and emits an alarm sound to the outside of the
housing 50 through the alarm output unit 71b when operating.
[0032]
The rear surface side of the cylindrical portion 72 of the housing cover 70 is widely open, and
the partition plate 75 set to an outer diameter that can be inserted into the cylindrical portion 72
is inserted and closed. That is, as shown in FIGS. 3 and 4, the housing cover 70 and the partition
plate 75 form a storage space for the piezoelectric diaphragm 11, the dark box 30 and the circuit
board 40. The partition plate 75 is also integrally formed of a white resin material, similarly to
the case cover 70. During storage, the dark box 30 is connected to the circuit board 40 by the
two claws 30a, the dark box 30 is disposed on the case cover 70 side, and the circuit board 40 is
disposed on the partition plate 75 side. In the partition plate 75, a pair of projections 76, 76 for
positioning the circuit board 40 is formed on the surface facing the circuit board 40, and a
positioning hole 42, which is formed through the circuit board 40, By inserting the circuit board
42, the circuit board 40 is properly positioned, and the circuit board 40 is held so as not to rattle.
That is, when the partition plate 75 is inserted from the rear end of the cylindrical portion 72 of
the housing cover 70 while the circuit board 40 integrally connected to the dark box 30 is
positioned by the protrusions 76, 76, the dark box 30 and the circuit board 40 is stably held by
being held between the case cover 70 and the partition plate 75 in the front-rear direction, and is
stably held by the projections 76, 76 in the planar direction of the circuit board 40. The
piezoelectric diaphragm 11 and its mounting structure 90 are provided on the front side of the
partition plate 75, but the details will be described later. Further, the housing cover 70 and the
partition plate 75 are fixedly connected by a set screw (not shown).
[0033]
The base body 60 is a disk having an outer diameter equal to the outer diameter of the housing
cover 70, and is connected via the partition plate 75 so as to be concentric with the housing
cover 70. Also, the base body 60 is also integrally formed of a white resin material. On the back
side of the base body 60, as shown in FIG. 2, an insertion hole 61 of a long hole-like or keyholelike screw for screwing the installation wall of the fire alarm 10 is provided through ing. In
addition, a wall hooking ring 62 for suspending the fire alarm 10 on a hook or the like provided
on a wall surface is integrally formed on the base body 60. The wall hanging ring 62 is cut off
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when the fire alarm 10 is installed by hanging it on a wall, and its base end is attached to the
mounting hole 65 and used.
[0034]
Further, a pair of L-shaped connecting hooks, each having an end facing inward, are formed at
positions on the back surface side of the partition plate 75 that are both end portions of a
predetermined diameter. A pair of L-shaped hooks are formed on the front side of the base body
60 at positions corresponding to both end portions of a predetermined diameter, with their tips
directed outward. Then, the base body 60 and the partition plate 75 are connected by rotating
the base body 60 with respect to the partition plate 75 so that the tip end portions of the
respective connection hooks are inserted into the inside of the other. It is supposed to be. An area
between the base body 60 and the partition plate 75 is utilized as a storage space of a battery
(not shown).
[0035]
(Smoke Detection Means) The smoke detection means 45 is composed of a light emitting element
46 (for example, a light emitting diode) provided in the dark box 30 and a light receiving element
47 (for example, a photodiode). That is, the light emitting element 46 is disposed in the dark box
30 in a state where the irradiation range is limited, and the light receiving element 47 is disposed
in the dark box 30 in a state where the light receiving range is limited so that the inspection light
is not directly incident See Figure 6). Furthermore, in the dark box 30, the light emitting element
46 and the light receiving element 47 are arranged such that the irradiation area and the light
receiving area partially overlap, and smoke is generated in the overlapping area (referred to as a
smoke detection area A). When entering, the smoke scatters the light emitted from the light
emitting element 46 and enters the light receiving element 47, so that the smoke can be sensed.
[0036]
(Circuit board) The circuit board 40 is connected to the light emitting element 46 and the light
receiving element 47 of the smoke sensing means 45 described above, and the piezoelectric
diaphragm 11 (not shown) for emitting an alarm sound. An LED 41 as a light source indicating
an operating state and the above-described test push button are mounted. The LED 41 is
mounted on a surface of the circuit board 40 to which the dark box 30 is attached and hidden
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behind the dark box 30.
[0037]
Then, as the first function of the circuit board 40, when the light emitting element 46 is turned
on and the light receiving element 47 performs detection at a light intensity equal to or more
than a predetermined value at the time of turning on, the circuit board 40 executes a process of
ringing the piezoelectric diaphragm 11. Circuits are configured. Further, as a second function, a
circuit is configured to execute a process of causing the piezoelectric diaphragm 11 to ring when
the test push button is pressed, regardless of whether the light receiving element 47 is detected.
Further, as a third function, the circuit board 40 is normally turned on, and the light emitting
element 46 and the light receiving element 47 of the smoke detecting means 45 can detect
smoke (in operation). At a certain time, a circuit that executes a process of lighting the LED 41 is
configured.
[0038]
(Light Guide Member) The light guide member 12 includes a first light guiding portion 12a
formed in a round bar shape and a second light guiding portion 12b formed in a flat plate shape,
and these are light transmissive It is integrally formed of a high transparent material (for
example, resin). Then, the round bar-shaped first light guiding portion 12 a penetrates the dark
box 30, and the lower end thereof faces the LED 41 provided on the substrate 40, and the red
light of the LED 41 is disposed on the dark box 30. The light is transmitted to the second light
guide 12b. The second light guide portion 12b extends to the operation display portion 73d at
the front center of the housing cover 70 described above, and transmits the red light transmitted
from the first light guide portion 12a from the operation display portion opening 73d. It is
designed to emit towards the outside.
[0039]
(Dark Box) FIG. 5 is a perspective view of the dark box 30, and FIG. 6 is a cross-sectional view
showing the internal structure of the dark box 30. As shown in FIG. The dark box 30 has a
circular front plate 31 on the front side in the housing 50, a circular back plate 32 on the back
side, and the front plate 31 or the back plate 32 between the front plate 31 and the back plate
32. And an insect repellent net (not shown) covering the outer periphery of the dark box 30. The
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front plate 31, the back plate 32, and various structures integrally formed with these are all
formed of a black resin with high light absorbability.
[0040]
The front plate 31 and the back plate 32 are disks of equal outer diameter, and are connected to
each other in a concentric manner. Further, as shown in FIG. 6, between the front plate 31 and
the back plate 32, a light emitting element holding portion 33 for holding while covering the
periphery except for the front of the light emitting element 46 of the smoke sensing means 45; A
light receiving element holding portion 34 for holding while covering the periphery except the
front of the light receiving element 47 of the sensing means 45, a labyrinth portion 35 for
preventing intrusion of external light near the outer periphery of the dark box 30, and irradiation
light of the light emitting element 46 Shield plate 36 that prevents light from directly entering
the light receiving area of light receiving element 47, and the light emitted from light emitting
element 46 and collected on the outside of the smoke detection area A set by light emitting
element 46 and light receiving element 47 And a reflecting plate 37.
[0041]
The light emitting element holding portion 33 holds the light emitting element 46 in the center
direction, and includes an aperture portion 33 b that restricts the irradiation range. The light
receiving element holding portion 34 holds the light receiving element 47 in the center direction,
and includes a diaphragm portion 34 b that regulates the light receiving range. The shielding
plate 36 is disposed between the light emitting element holding portion 33 and the light
receiving element holding portion 34, and limits the irradiation range of the light emitting
element 46 so as to be away from the light receiving element 47 side. The overlapping area of
the irradiation area defined by the light emitting element holding portion 33 and the shielding
plate 36 and the light receiving area defined by the light receiving element holding portion 34 is
the smoke detection area A, and the smoke intrudes into the smoke detection area A. As a result,
the scattered light is sensed by the light receiving element 47.
[0042]
The reflection plate 37 has a concave surface for reflecting the irradiation light from the light
emitting element 46, condenses the irradiation light from the light emitting element 46 to the
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outside of the dark box 30, and suppresses the influence of disturbance light other than scattered
light at the time of smoke detection. And the S / N ratio can be improved. The labyrinth portions
35 are wall surfaces of various shapes disposed so as to surround the smoke detection area A,
and are arranged so as to engage with each other while forming a gap through which the smoke
passes, the exterior to the smoke detection area A It prevents the penetration of light. Reference
numeral 38a is a hole through which the first light guide 12a of the light guide member 12
formed through the dark box is inserted.
[0043]
(Piezoelectric Vibrating Plate and Mounting Structure Thereof) FIG. 7 is an exploded perspective
view of a mounting structure 90 of the piezoelectric vibrating plate 11 provided on the partition
plate 75, and FIG. 8 is a front view of the partition plate 75. First, the piezoelectric diaphragm 11
mainly includes a metal disk 11a and a piezoelectric element 11b having a smaller diameter than
this (see FIG. 10), and the piezoelectric element 11b is provided concentrically on one side of the
metal disk 11a. It is done. Then, by energizing the piezoelectric element 11b from the circuit
board 40 described above, the vibration can be generated to generate vibration noise.
[0044]
The attachment structure 90 of the piezoelectric diaphragm 11 is connected to the partition plate
75 of the housing 50, and the cover body 20 for holding the piezoelectric diaphragm 11 between
the partition plate 75, the partition plate 75, and the cover body 20 And a connecting structure
91 for connecting the two.
[0045]
9A is a perspective view illustrating the front side of the cover body 20, FIG. 9B is a perspective
view illustrating the back side, and FIG. 10 is a cross-sectional view taken along the line Y-Y in
FIG.
The cover body 20 as a whole is composed of a plurality of plate-like portions integrally formed
of resin. That is, the cover body 20 has a small diameter cylindrical portion 21 forming a hollow
portion resonating with the piezoelectric vibration plate 11, a circular flat plate portion 22 facing
the piezoelectric vibration plate 11 at one end of the small diameter cylindrical portion 21, and
the piezoelectric vibration plate 11. Large diameter cylindrical portion 23 surrounding the ring,
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an annular flat plate portion 24 connecting the cylindrical portions 21 and 23, a pair of legs 25
and 25 extending toward the partition plate 75, and the legs 25 and 25 In addition, engaging
portions 26 and 26 are provided to be bent at the tip of the guide and to be engaged with the
partition plate 75, and each of these portions is formed in a planar or curved plate shape.
[0046]
The small diameter cylindrical portion 21 is closed at its front end by a circular flat plate portion
22. A sound emitting hole 22a for emitting a sound when the piezoelectric diaphragm 11
vibrates is formed in the circular flat plate portion. The rear end of the small diameter cylindrical
portion 21 is wide open, and the outer diameter of the small diameter cylindrical portion 21 is
set to be substantially uniform in the central axis direction and smaller than the outer diameter
of the piezoelectric diaphragm 11 There is. Then, in a state where the cover body 20 is mounted
on the partition plate 75, the piezoelectric diaphragm 11 is disposed so as to close the open end
of the small diameter cylindrical portion 21. In this state, the piezoelectric vibration plate 11
faces the inner surface of the circular flat plate portion 22 via the small diameter cylindrical
portion 21, and a cylindrical hollow portion is formed by the piezoelectric vibration plate 11, the
small diameter cylindrical portion 21, and the circular flat plate portion 22. Be done. The inner
diameter of the small diameter cylindrical portion 21, the entire length, the inner diameter of the
sound output hole 22a of the circular flat plate portion 22, and the wall thickness of the small
diameter cylindrical portion 21 and the circular flat portion 22 are at the time of vibration of the
piezoelectric diaphragm 11 (during sound generation). The sound is set so as to cause resonance,
and when the piezoelectric diaphragm 11 is energized, a sound with a larger sound pressure is
emitted from the sound output hole 22a.
[0047]
The front end of the large diameter cylindrical portion 23 is connected to the opening end of the
small diameter flat plate portion 21 through the annular flat plate portion 24, and the rear end is
widely open. The inner diameter of the large diameter cylindrical portion 23 is set to be slightly
larger than the outer diameter of the piezoelectric diaphragm 11, and the piezoelectric
diaphragm 11 can be stored inside thereof. Further, as shown in FIG. 11, the opposite end of the
small diameter cylindrical portion 21 slightly protrudes to the back side more than the annular
flat plate portion 24, and in a state where the protruding open end is in contact with one surface
The diaphragm 11 is housed and held in the large diameter cylindrical portion 23. Further, two
notches 23a and 23b are formed on the circumferential surface of the large diameter cylindrical
portion 23 (FIG. 9). The cover 20 is attached to and detached from the partition plate 75 by
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sliding in the rotational direction. That is, in the slide operation of attachment / detachment, the
end of each of the notches 23a and 23b abuts on the projections 77 and 78 as stoppers provided
on the front side of the partition plate 75, thereby performing the rotation operation. It is for
limiting to the appropriate range (FIG. 7).
[0048]
Leg portions 25, 25 are formed at both end portions in the diameter direction of the open end
portion of the large diameter cylindrical portion 23. Each of the legs 25, 25 is integrally formed
on the same circumferential surface as the circumferential surface of the large diameter
cylindrical portion 23, and from the end face of the open end of the large diameter cylindrical
portion 23 toward the cylinder center line direction It is formed in a protruding state (along the
direction of the cylinder center line). Further, plate-like engaging portions 26, 26 are formed at
the tip end portions of the legs 25, 25 so as to be substantially perpendicular to the plate
surfaces of the legs 25, 25. The respective engaging portions 26, 26 extend outward in the radial
direction of the large diameter cylindrical portion 23. The legs 25 and 25 and the engaging
portions 26 and 26 constitute a part of a connecting structure 91 described later.
[0049]
In the cover body 20, any plate-like portion adjacent to each other, that is, the boundary between
the small diameter cylindrical portion 21 and the annular flat portion 24, the boundary between
the annular flat portion 24 and the large diameter cylindrical portion 23, and the leg 25
Reinforcing ribs 27, 28, 29 are provided integrally with the plate-like parts at the boundaries
between the two and the engaging parts 26. Each of the reinforcing ribs 27, 28, 29 is a plate-like
body that is oriented substantially perpendicular to the plate surface of the flat plate portion
positioned on each of the two sides. Since the reinforcing ribs 27, 28, 29 are integrally formed at
the boundary between the flat plate portion and the flat plate portion, even when an external
force is applied to the cover body 20, the angle at which the flat plate portion and the flat plate
portion intersect. Of the cover body 20 is suppressed, distortion of the cover body 20 is
suppressed, and the original shape can be maintained. Further, the reinforcing ribs 27 provided
at the boundary between the small diameter cylindrical portion 21 and the annular flat plate
portion 24 are provided as a pair at both end portions in the diameter direction of the small
diameter cylindrical portion and formed so as to protrude in a square shape outward in the
diameter direction. It is done. As described above, since the cover body 20 is slid in the rotational
direction at the time of its attachment and detachment, the pair of reinforcing ribs 27 also
function as a knob at the time of the rotational slide operation, and the operability at the time of
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mounting operation Can be improved. In addition, the plate surface shape, arrangement, and
number of individuals of the reinforcing ribs 27, 28, 29 are not particularly limited, except for
the case where the function other than reinforcement is given as in the case of the reinforcing rib
27 described above. It is desirable that the necessary and sufficient number of individuals be
obtained by an arrangement that is effective for suppressing deflection and distortion of the flat
plate portion. Further, with regard to the reinforcing rib 28, when the piezoelectric vibration
plate 11 vibrates, it is more preferable to arrange the reinforcing rib 28 at a height that does not
disturb the vibration.
[0050]
11 is a cross-sectional view taken along the line Z-Z in FIG. 10, and FIG. 12 is an enlarged
perspective view of the connecting structure 91. As shown in FIG. As shown in FIG. 8 and FIG. 10
to FIG. 12, the connecting structure portion 91 engages with the leg portion 25 and the engaging
portion 26 of the cover body 20 described above and the engaging portion 26 provided on the
partition plate 75. An engaged portion 92 and a stopper 93 for maintaining the engaged state of
the engaging portion 26 and the engaged portion 92 are provided. The engaged portion 92 and
the stopper 93 correspond to the leg portion 25 and the engaging portion 26 of the cover 20,
and the diameter of the large diameter cylindrical portion 23 described above on the flat surface
on the front side of the partition plate 75. The two are separated by a distance approximately
equal to. The engaged portions 92 and the stoppers 93 are integrally formed of the same
material as the partition plate 75.
[0051]
Each of the engaged portions 92 is formed in a plate shape so as to cover a part of the long hole
portion 94 formed by penetrating the partition plate 75 from the front surface to the back
surface side from the front surface side. More specifically, each elongated hole portion 94 is
formed in an arc shape on the same circumference of a diameter substantially equal to that of the
large diameter cylindrical portion 23, and each leg portion 25 and the engaging portion 26 of the
cover body 20 are front The long holes 94 are inserted from the side. Further, inside each long
hole portion 94, a step portion 95 on which the engaging portion 26 is mounted is formed. The
stepped portion 95 prevents the legs 25 and the engagement portion 26 of the cover 20 from
invading too deeply into the long hole portion 94. The cover body 20 is slid on in the direction of
rotation along the circumferential direction of the large diameter cylindrical portion, and
mounted on the partition plate 75. And each engaging part 26 will move inside the long hole part
94 at the time of the said slide operation. The elongated hole portion 94 is set to have a length
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exceeding at least twice the width of the engaging portion 26 in the slide operation direction.
[0052]
As shown in FIGS. 8 and 12, the engaged portion 92 is a half of the sliding operation direction
downstream side of the elongated hole portion 94 only, that is, the sliding operation direction in
the longitudinal direction of the elongated hole portion 94 (strictly, it is half And a half range
(substantially a quarter range substantially) of the arc-shaped elongated hole portion 94 is
covered from the front side. Then, when mounting the cover body 20 on the partition plate 75,
the engaging portion 26 is inserted into the long hole portion 94 from the upstream side in the
slide operation direction where the engaged portion 92 does not cover, The plate-like engaging
portion 26 is inserted to the back side of the engaged portion 92 by rotating the plate. At this
time, as shown in FIG. 11, the front surface of the engaging portion 26 and the back surface of
the engaged portion 92 are in contact with each other, and the engaged portion 92 partitions the
cover body 20 with respect to the engaging portion 26. It will be in the state located in the
direction (front side) spaced apart from board 75. Therefore, the cover body 20 can be mounted
on the partition plate 75 by the engagement between the engaging portion 26 and the engaged
portion 92. That is, the engaging portion 2 and the engaged portion 92 "have a positional
relationship in which the sliding operation of the cover 20 prevents the wall surface of the
partition plate 75 of the housing 50 and the cover 20 from moving away from each other. It will
function as "the opposite part".
[0053]
Further, inclined surfaces 26a and 92a are formed on the front end of the engaging portion 26 at
the upstream end in the slide operation direction and at the rear surface of the engaged portion
92 at the downstream end in the slide operation direction. There is. The inclined surface 26a of
the engaging portion 26 is inclined so as to guide the engaged portion 92 in a positional
relationship that prevents movement of the engaged portion 92 in the direction in which the
housing and the cover body are separated from each other when moving by sliding operation.
ing. That is, the inclined surface 26 a is inclined in the direction of guiding the engaged portion
92 to the front side of the engaging portion 26 by the sliding movement of the engaging portion
26. Further, the inclined surface 92 a is inclined in the direction of guiding the engaging portion
26 to the back side of the engaged portion 92 by the sliding movement of the engaging portion
26.
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[0054]
The stopper 93 is cantilevered in the elongated hole portion 94 from the upstream end of the
elongated hole portion 94 in the sliding operation direction. That is, the stopper 93 is capable of
bending the end portion on the downstream side in the sliding operation direction by elastic
deformation, and has a protruding portion projecting to the front side at the tip end portion.
Then, in the process of moving the inside of the long hole 94 from the upstream side to the
downstream side by the sliding operation, the engaging portion 26 of the engaged portion 92
does not push the distal end of the stopper 93 back. The stopper 93 is provided so that it can not
be moved to the back side. Then, when the engaging portion 26 is moved to the back side of the
engaged portion 92, the engaging portion 26 completely passes through the stopper 93, and the
stopper 93 returns to the original position. The tip end portion abuts on the upstream end of the
engaging portion 26 in the sliding movement direction to restrict reverse movement to the
upstream side.
[0055]
Further, at the holding position of the piezoelectric diaphragm 11 at the front of the partition
plate 75, four contact protrusions 96 that contact the back surface side of the piezoelectric
diaphragm 11 are integrally formed on the partition plate 75 (FIG. 7, FIG. 10). In the state where
the piezoelectric diaphragm 11 is attached to the partition plate 75 by the mounting structure
90, each of the abutment projections 96 has the respective abutment projections 96 and the rear
end of the small diameter cylindrical portion 21 of the cover 20. And a height (protrusion
amount) that can be pressed and held by the That is, the rear end portion of the small diameter
cylindrical portion 21 and the contact protrusions 96 function as contact portions that are in
pressure contact with the piezoelectric diaphragm 11 when the partition plate 75 of the housing
50 and the cover body 20 are connected.
[0056]
(Description of Operation of Fire Alarm) First, an operation for attaching the piezoelectric
diaphragm 11 to the partition plate 75 will be described. The respective engaging portions 26 of
the cover body 20 are inserted into the elongated hole portion 94 of the partition plate 75 in a
state where the piezoelectric diaphragm 11 is stored in the large diameter cylindrical portion 23
of the cover body. Then, by sliding the cover body 20 in a predetermined rotational direction
(clockwise direction in FIG. 8) in such a state, the engaging portion 26 enters the back side of the
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engaged portion 92 and is not moved in the reverse direction by the stopper 93 Locked on
Further, in the process of the slide operation, the engaging portion 26 is guided by the inclined
surfaces 26a and 92a of the engaging portion 26 and the engaged portion 92 so as to move in
the direction in which the engaging portion 26 sinks back. The engaging portion and the
engaged portion are in pressure contact with each other, and the piezoelectric vibrating plate 11
is pressed from both the front side and the back side by the rear end of the small diameter
cylindrical portion 21 and each contact projection 96 Hold is performed. In addition, when
rotating the cover body 20, if the rotating operation is performed by pinching the reinforcing
ribs 27, 27 described above, the mounting is very easy.
[0057]
Further, the operation of the assembled fire alarm 10 will be described. The fire alarm 10 is
attached to the rear surface of the housing 50 in close contact with the ceiling surface of the
building or in close contact with a vertical wall. When the circuit board 40 is connected to a
battery which is a power supply, the circuit board 40 performs predetermined initialization, and
then lights the light emitting element 46 of the smoke sensing means 45 and lights the LED 41
indicating normal operation of the smoke sensing means 45 . Also, when smoke is generated due
to a fire, the smoke intrudes into the smoke detection area A from the opening 73 c of the
housing 50 through the labyrinth portion 35 of the dark box 30. Then, the irradiation light of the
light emitting element 46 is scattered and received by the light receiving element 47, and the
circuit board 40 squeezes the piezoelectric diaphragm 11 from the light sensing of the light
receiving element 47. Fire detection is thereby performed.
[0058]
(Effects of the Embodiment) In the above fire alarm 10, as the attachment structure 90 of the
piezoelectric diaphragm 11, the engaging portion 26 is formed on the cover 20 and the engaged
portion 92 on the partition plate 75, which are the cover Since 20 is mounted and held on the
partition plate 75 by a slide operation, the piezoelectric diaphragm 11 can be held without using
a fixing tool such as a screw, and the number of parts can be reduced. Further, since the cover
body 20 has both the function of forming a cavity to cause resonance and the function of holding
the piezoelectric diaphragm 11, the number of parts can be further reduced as compared with
the case where these are implemented by separate members. Is possible.
[0059]
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In addition, since the mounting of the piezoelectric diaphragm 11 is easily performed by the
rotational slide operation of the cover 20, the work can be simplified and speeded up. In
particular, since both the engaging portion 26 and the engaged portion 92 have the inclined
surfaces 26a and 92a, the transition to the mounting state of the cover body 20 by the slide
operation is smoothly performed, and the piezoelectric diaphragm It is possible to further
simplify and smooth the mounting work of 11.
[0060]
Furthermore, since the stopper 93 is provided on the partition plate 75, the movement of the
engagement portion 26 of the cover body 20 in the direction to release the engaged state from
the engaged portion 92 is restricted. It is possible to maintain the mounting state of the cover
body 20, maintain the holding state of the piezoelectric diaphragm 11, and suppress accidental
detachment.
[0061]
Further, in the state where the cover body 20 is mounted on the partition plate 75, since the
small diameter cylindrical portion 21 for pressing the piezoelectric diaphragm 11 from both
directions and the contact projection 96 are provided, holding the piezoelectric diaphragm 11 in
a sandwiched state As a result, the piezoelectric diaphragm 11 can be held stably.
[0062]
Further, since the reinforcing ribs 27, 28 and 29 are provided on each part of the cover body 20,
even when the cover body is attached to the housing or when an external force is received after
the attachment, the respective planes in which the ribs intervene The crossing angles of the two
are maintained by the reinforcing ribs 27, 28 and 29 to suppress the occurrence of bending and
distortion of the cover body 20.
Therefore, fluctuation or abnormality of the contact state between the small diameter cylindrical
portion 21 and the piezoelectric vibrating plate 11 when the cover body 20 is attached is
suppressed, and the appropriate contact state between the small diameter cylindrical portion 21
and the piezoelectric vibrating plate 11 is maintained. It becomes possible to properly and
properly generate sound due to the resonance of the diaphragm 11.
04-05-2019
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[0063]
(Others) In the present embodiment, the case where the piezoelectric diaphragm 11 is attached
to the fire alarm 10 is illustrated, but the target to which the piezoelectric diaphragm 11 is
attached is not limited thereto, and the piezoelectric diaphragm The mounting structure shown in
this embodiment can be applied to any electronic devices required.
Further, the stopper provided on the side of the partition plate 75 may be provided only on the
cover 20 or on the cover 20.
[0064]
It is a perspective view showing the front side of a fire alarm which is an embodiment of the
invention. It is a perspective view which shows the back side of a fire alarm. It is a disassembled
perspective view of a fire alarm. It is sectional drawing of the fire alarm which followed XX line
shown in FIG. It is a perspective view of a dark box. It is sectional drawing which shows the
internal structure of a dark box. It is a disassembled perspective view of the attachment structure
of the piezoelectric diaphragm provided in the partition plate. It is a front view of a partition
plate. FIG. 9A is a perspective view illustrating the front side of the cover body, and FIG. 9B is a
perspective view illustrating the back side of the cover body. It is sectional drawing along the YY
line in FIG. It is sectional drawing along the ZZ line in FIG. It is an expansion perspective view of a
connection structure part.
Explanation of sign
[0065]
DESCRIPTION OF SYMBOLS 10 fire alarm (electronic device) 11 piezoelectric diaphragm 11a
metal disk (flat plate) 11b piezoelectric element 20 cover body 21 small diameter cylindrical part
(hollow part) 22 circular flat plate part 22a sound emitting hole 23 large diameter cylindrical
part 24 annular flat plate part 25 leg 26 engagement portion (opposite portion) 26a inclined
surface 27, 28, 29 reinforcement rib 50 housing 90 attachment structure 92 engaged portion
(opposite portion) 91 connection structure portion 92a inclined surface 93 stopper 96 abutment
projection Contact part)
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