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JPH0580774

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This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
complete, reliable or fit for specific purposes. Critical decisions, such as commercially relevant or
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DESCRIPTION JPH0580774
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to the
improvement of thin buzzers, particularly small and thin buzzers mounted directly on a printed
circuit board.
[0002]
2. Description of the Related Art Although various electronic components are standardized as
chip components in order to enable automatic assembly of electronic components, printed circuit
boards for use as call buzzers for portable small receivers such as pagers. Thin buzzers directly
mounted on the surface are also developed as surface mount buzzers which can be mounted on a
printed circuit board by applying cream solder or the like as in the case of such chip parts.
[0003]
Japanese Patent Application Laid-Open No. 2-34900 (Japanese Patent Application No. 63185061) shows an example of such a buzzer with a surface mounting terminal, and it is possible
to automatically assemble the buzzer onto a printed circuit board by the surface mounting
terminal provided on the base of the buzzer. It becomes possible.
[0004]
Therefore, according to such a surface mounted buzzer, like other chip electronic components,
the buzzer can be easily assembled on a desired printed circuit board by a series of automatic
assembly lines, and the range of use thereof can be significantly expanded. .
03-05-2019
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[0005]
However, in the above-mentioned conventional apparatus, the thickness of the buzzer can not be
reduced, and the thickness of the buzzer becomes thicker than that of other chip electronic
components. Therefore, an apparatus incorporating such a printed circuit board There is a
problem that the miniaturization of the
Also, conventionally, a small and light buzzer used for a wireless calling receiver is shown as
Japanese Utility Model Application Publication No. 63-33197.
However, in this conventional device, the structure for connecting the external connection
terminal and the exciting coil terminal tends to increase the thickness of the buzzer, and a
necessary thin buzzer can not be obtained.
[0006]
That is, in the conventional excitation coil end processing, the buzzer case opening is passed
through the external connection terminal, and the guided coil end is soldered to the terminal, and
then the opening is sealed with a sealing adhesive. In this case, depending on the amount of
solder buildup and variations in the amount of buildup of the sealing adhesive, these may
protrude outside the buzzer case.
As a result, there has been a problem that the entire buzzer ascends from the substrate at the
time of mounting on a circuit substrate, or positioning by the mounter on the substrate becomes
difficult.
[0007]
Further, as a conventional general buzzer structure, for example, Japanese Utility Model
Application Publication Nos. 54-178522, 57-105700, and 57-153398 are known, and in these
conventional apparatuses, the excitation coil terminal is used as a buzzer. Although the structure
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to process in an assembly is shown, it had the subject that the workability was very bad in the
process, since between a terminal and a coil terminal was close. Furthermore, since such a
conventional device has a general buzzer structure, it can not be applied as it is to a surface
mounted buzzer as in the present invention.
[0008]
The present invention has been made in view of the above-mentioned conventional problems,
and the object of the present invention is a small-sized, thin, mass-produced small-sized and thin
buzzer capable of easily connecting an exciting coil terminal to an external connection terminal.
Another object of the present invention is to improve the reliability of the buzzer positioning and
fixing operation to the substrate with a structure capable of maintaining the dimensional
accuracy of the buzzer as well as providing it.
[0009]
SUMMARY OF THE INVENTION In order to achieve the above object, the present invention
incorporates a buzzer assembly including an exciting coil, and a buzzer case provided with a lead
connection chamber adjacent to the buzzer assembly. And an external connection terminal
integrally fixed to the buzzer case, having one end exposed to the outside and the other end
extended to the lead connection chamber, the exciting coil terminal being a lead connection
chamber in the buzzer case It is characterized in that it is connected to the external connection
terminal.
[0010]
Therefore, according to the present invention, the buzzer case and the lead connection chamber
adjacent thereto are disposed in the buzzer case, and the exciting coil terminal is drawn from the
buzzer assembly to the lead connection chamber in the buzzer case, Since the lead connection
chamber has a large space, electrical connection with the external connection terminal can be
easily made.
Therefore, according to the present invention, the lead connection chamber is solder or a sealing
adhesive for sealing a coil terminal, a coil lead-out opening, etc. which secures an electrical
connection when connecting the exciting coil terminal to the external connection terminal. There
is an advantage that it fits and does not appear outside the buzzer.
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[0011]
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A preferred embodiment of the
present invention will be described below with reference to the drawings.
[0012]
FIGS. 1 to 4 show a first preferred embodiment of a thin buzzer according to the present
invention.
[0013]
In the figure, the buzzer case 10 is formed by plastic injection molding, the buzzer assembly 11 is
incorporated therein, and the lead connection chamber 12 is provided adjacent to the buzzer
assembly 11.
In the present invention, a space for connecting the exciting coil terminal to the external
connection terminal in the inside of the buzzer case 10 is secured in the lead connection
chamber to improve the workability, and the protrusion of the solder etc. to the outside of the
buzzer case 10 is removed. can do.
Furthermore, in the following embodiments, the lead connecting chamber 12 is also effective for
forming an effective resonance space at the time of sound generation.
[0014]
The external connection terminals 13 and 14 are fixed to the lead connection chamber 12, and
as is clear from FIG. 4, one end 14a of the external connection terminal 14 is exposed to the
outside for surface mounting, and the other end 14b extends into the lead connection chamber
12 of the buzzer case 10, and the exciting coil terminal of the buzzer assembly 11 can be
connected inside the buzzer case as described later.
[0015]
In the embodiment, the external connection terminals 13 and 14 are integrally formed on the
buzzer case 10 by insert molding.
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[0016]
Next, the buzzer assembly 11 of the present embodiment will be described.
[0017]
In the embodiment, the buzzer assembly 11 includes an iron core 15 and a yoke base 16 fixed to
the iron core 15 by caulking. The iron core 15 and the yoke base 16 are both made of a high
permeability material. It is similarly insert-molded in the buzzer case 10.
Therefore, in the present embodiment, the yoke base 16 forms a part of the buzzer case 10 by
insert molding.
[0018]
An exciting coil 17 is adhesively fixed around the iron core 15, and the exciting coil terminals
17a and 17b are connected to the external connection terminals 13 and 14 described above.
[0019]
A magnet 18 is disposed around the exciting coil 17. In the illustrated embodiment, the magnet
18 is a ring-shaped magnet. In the present invention, the magnet 18 is segmented or rectangular
in the circumferential direction. It is also possible to form a combination magnet divided into a
plurality of pieces.
Further, in the present invention, the diaphragm support frame 19 is disposed further around the
magnet 18.
In the embodiment, the diaphragm support frame 19 is integrally formed with the buzzer case
10, and as a result, the magnet 18 is fixed and supported along the inner wall of the diaphragm
support frame 19.
The magnet 18 attracts the diaphragm 20 mounted on the diaphragm support frame 19 and
firmly positions the diaphragm 20 on the support frame 19, and applies a bias magnetic force to
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the iron piece 21 fixed to the diaphragm 20.
In the embodiment, the magnet or the combination magnet 18 and the diaphragm support frame
19 have a ring shape, and the diaphragm 20 itself has a disk shape.
[0020]
The iron piece 21 constitutes a magnetic circuit of a buzzer and determines a buzzer resonance
frequency, and the diaphragm 20 is not necessarily made of a high magnetic permeability
material when the iron piece 21 is used.
[0021]
In the buzzer case 11, a plurality of, in the embodiment, six ribs 10b are provided around the
diaphragm support frame 19, and the diaphragm 20 placed on the support frame 19 is a
plurality of ribs It will be positioned firmly by 10b.
[0022]
As described above, the buzzer assembly 11 is incorporated in the buzzer case 10, and the lid 22
is firmly fixed to the buzzer case 10 by ultrasonic bonding or the like in the embodiment.
Further, in the buzzer of the embodiment, as a part of a housing composed of the buzzer case 10
and the lid 22 is indicated by a reference numeral 23, the opening 23 forms a sound generation
opening.
[0023]
In the buzzer assembly 11 according to the embodiment, as described above, the speaker unit 10
forms the first resonance space by the buzzer case 10, the vibrator support frame 19 and the
diaphragm 20, and a slight excitation current is generated. It is possible to secure the necessary
volume by
Furthermore, in the embodiment, the lead connection chamber 12 forms a second resonance
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space to achieve better sound emission efficiency.
[0024]
What is characterized in the present invention is that in the apparatus in which the buzzer
assembly 11 and the lead connection chamber 12 are provided in the buzzer case 10, the
external connection terminals 13 and 14 ensure the terminal of the exciting coil 17 easily and
easily. In the structure leading to For this purpose, according to the present invention, the inner
surface of the buzzer case 10 is provided with a lead groove 10a for guiding the exciting coil
terminals 17a and 17b. Further, in the present embodiment, since the yoke base 16 also forms a
part of the buzzer case 10, the notch portion 16a shown in a substantially rectangular shape in
FIG. 1 through which the exciting coil terminals 17a and 17b pass also in the yoke base 16 Is
provided.
[0025]
In the embodiment, since the diaphragm support frame 19 is integral with the buzzer case 10,
the support frame 19 is also provided with a through hole 19a at a portion corresponding to the
lead groove 10a.
[0026]
Therefore, the exciting coil terminals 17a and 17b are pulled out to the lead connection chamber
12 through the notch portion 16a of the yoke base 16, the lead groove 10a provided on the
inner surface of the buzzer case 10, and the through hole 19a of the support frame 19. After
that, the exciting coil 17 is adhesively fixed to the iron core 15.
Then, in this state, the magnet 18 of the embodiment is fixed to the inner wall of the support
frame 19.
[0027]
The exciting coil terminals 17a and 17b drawn to the lead connection chamber 12 are connected
to the external connection terminals 13 and 14 by cream solder or the like.
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[0028]
The lead groove 10 a is sealed by an adhesive 24.
In the embodiment, this sealing simultaneously seals the through holes 19a of the support frame
19, and as a result, the resonance space of the buzzer assembly 11 is fully closed.
[0029]
As described above, according to the first embodiment, the exciting coil terminals 17a and 17b of
the buzzer assembly 11 are pulled out to the lead connection chamber 12 through the notch
portion 16a, the lead groove 10a and the through hole 19a, extremely easily. The connection
process of the exciting coil terminal is performed.
[0030]
The small and thin buzzer thus formed can be easily assembled by cream solder or the like on a
printed circuit board (not shown) on which the external connection terminals 13 and 14 exposed
to the circuit are not shown.
[0031]
In the embodiment, the pins 10c and 10d provided on the lower surface of the buzzer case 10
are used for positioning with the printed circuit board.
A dummy terminal 25 is insert-molded on the buzzer case 10 in the same manner as the external
connection terminals 13 and 14 and serves as a reinforcement for mounting the buzzer by the
external connection terminals 13 and 14.
[0032]
The second embodiment of the present invention is shown in FIGS. 5 to 7 and is similar to the
first embodiment described above, so the corresponding members are indicated by adding 100 to
the reference numerals of the first embodiment, and the details will be detailed. I omit
explanation.
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[0033]
In the second embodiment, the diaphragm support frame 119 of the buzzer assembly 111 is a
ring-shaped member separate from the buzzer case 110 and is incorporated into the buzzer case
110 together with the magnet 118 after the exciting coil 117 is incorporated.
Further, according to the second embodiment, as is apparent from FIG. 6, the iron core 115 and
the yoke base 116 are integrally formed.
[0034]
In order to position the support frame 119, the buzzer case 110 is provided with a buzzer
assembly support portion 110e, and the support portion 110e is provided with a notch groove
110f for guiding the exciting coil terminal 117a (117b).
[0035]
The exciting coil terminals 117a and 117b are guided from the notch groove 110f provided in
the buzzer case 110 to the lead connection chamber 112 after the exciting coil 117 is adhered
and fixed to the iron core 115, and reliably and easily to the external connection terminals 113
and 114. Connected to
Next, the diaphragm support frame 119, the magnet 118, and the diaphragm 120 are disposed
in the buzzer case 110, and the lead groove 110a is sealed by the sealing adhesive 124 to secure
the resonance space of the buzzer assembly 111. Can.
Of course, in the present invention, the exciting coil terminals 117a and 117b are temporarily
pulled out from the notch groove 110f provided in the buzzer case 110 to the lead connection
chamber 112, and in this state the diaphragm support frame 119, the magnet 118 and the
diaphragm 120 are buzzer case It is also preferable to connect the excitation coil terminals 117a
and 117b, which are attached to 110 and drawn out to the lead connection chamber 112 after
completing the buzzer assembly 111, to the external connection terminals 113 and 114.
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[0036]
In addition, after the excitation coil end connection is completed, the lead groove 110 a is sealed
by the adhesive 124 so that the resonance space of the buzzer assembly 111 can be secured.
[0037]
In the second embodiment, as shown in FIG. 7, the external connection terminals 113 and 114
extend toward the lid 122 and are connected to the printed circuit board on the lid side.
The reference numeral 125 is similar to the dummy terminal 25 shown in the first embodiment,
and serves as a reinforcement for surface mounting of a thin buzzer.
[0038]
The third embodiment of the present invention is shown in FIGS. 8 and 9 and is similar to the
first embodiment described above, so the corresponding members are indicated by adding 200 to
the reference numerals of the first embodiment, and the detailed description will be given. Is
omitted.
[0039]
In the third embodiment, the buzzer case 210 is formed of a substantially flat plate, which is
different from the box-shaped case structure in each of the above-described embodiments.
In the third embodiment, the lid 222 has a box shape, and as a result, in the third embodiment,
when the coil terminals 217a and 217b of the exciting coil 217 are soldered and fixed to the
external connection terminals 213 and 214. There is an advantage that the workability of is
good. That is, in the third embodiment, since the buzzer case 210 is substantially flat, there is no
side wall of the buzzer case 210 at the time of drawing of the coil end, soldering, etc., so there is
an advantage that fine work can be easily performed. There is.
[0040]
Further, as apparent from the third embodiment, the sounding opening 223 is narrower than the
other embodiments according to the shape of the lid 222, and the volume or frequency
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characteristic of sounding can be arbitrarily adjusted by the shape of the opening 223. There is
an advantage.
[0041]
In each of the embodiments described above, the magnet and the diaphragm support frame are
formed separately from each other, but in the present invention, they may be integrated and the
diaphragm may be held using a part of the magnet. It is.
[0042]
In the embodiment described above, the external connection terminal is provided as a surface
mounting terminal and can be soldered and fixed to the printed circuit board as it is, but this
external connection terminal is a terminal pin protruding downward from the buzzer case and is
used for It is also possible to make it the structure which inserts.
[0043]
Further, according to the present invention, the buzzer assembly may be closed type or open
type, and this portion may be opened without sealing the opening for the coil end drawn from
the buzzer assembly to the lead connection chamber with an adhesive or the like. A buzzer
assembly having a sound generation opening can be used, and such an opening type buzzer
assembly can make the sound generation frequency characteristics relatively broad band
characteristics, and make the excitation current to the excitation coil an AC drive type, By
covering the sound generation frequency widely and changing the tone quality of the buzzer or
by using a speaker type, it is also possible to provide a thin buzzer capable of sound generation.
[0044]
As described above, according to the present invention, the buzzer can be reduced in size and
thickness, and the excitation coil terminal forming the buzzer assembly is connected externally in
a wide space outside the buzzer assembly inside the buzzer case. Since the coil terminal
processing can be performed in the buzzer case by guiding to the terminal and utilizing the wide
space, the connection work is simplified.
Also, as in the conventional case, the solder swells to the outside of the case of the buzzer which
occurs when the coil is connected to the external connection terminal, or a seal for sealing the
coil guide path guided outward from the inside of the buzzer assembly. Since the buildup of the
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sealing adhesive to the outside can be removed, and the structure does not affect the external
accuracy of the buzzer case, there is an advantage that the automatic assembly accuracy can be
maintained and soldering defects are less likely to occur.
In addition, it is possible to provide a mass-produced, stable, low-quality buzzer.
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