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DESCRIPTION JP2003348679

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DESCRIPTION JP2003348679
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
small speaker device used for portable electronic devices such as portable telephones and
personal digital assistants (PDAs).
[0002]
2. Description of the Related Art Heretofore, there have been such small speaker devices as
shown in FIGS. 6A to 6C. When assembling the conventional small speaker apparatus as shown
to FIG. 6 (A)-(C), the yoke 2 was insert-molded to the flame | frame 1 formed in the side view
reverse convex shape shape, and both were shape | molded integrally Thereafter, the magnet 3
and the plate 4 are placed in the recess 2 a of the yoke 2. Next, the voice coil 6 is attached to the
diaphragm 5, and the voice coil 6 is fitted to the step portion 1a of the frame 1 so that the
peripheral edge of the diaphragm 5 is fixed with an adhesive. Furthermore, after the terminal 7
of the voice coil 6 is electrically connected to the lead substrate 8 formed on the back surface of
the frame 1, a case cap 9 having a large number of vent holes 9a is attached to the frame 1. A
plurality of back holes 1b for adjusting the back pressure of air against the vibration of the
diaphragm 5 are provided on the back of the frame 1 at regular intervals in the circumferential
direction except for the portion where the lead substrate 8 is formed. It is set up.
[0003]
By the way, since the frame 1 is formed in a convex shape in a side view, the conventional small
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speaker device is used by providing a box (cabinet) as a separate member when attaching it to a
portable electronic device.
[0004]
However, in the above-described conventional small-sized speaker device, in the case of a boxtype speaker device, the frame 1 is formed in the shape of a reverse convex shape in a side view.
Needs to be provided with a separate box.
Therefore, the number of mounting steps and the number of parts of the box increase, and it
takes time and effort to manufacture the box, and there is a problem that the assembling
efficiency as the speaker device is low.
[0005]
Further, in the conventional small speaker device, since the lead substrate 8 is directly formed on
the back surface of the frame 1, the back substrate hole is formed on the back plate 1 for
adjusting the back pressure of air to the diaphragm 5. It can be drilled only in the circumferential
direction excluding the above-mentioned part. As a result, an imbalance in back pressure of air
occurs with respect to the diaphragm 5, which is one of the causes such as rolling that occurs
due to the diaphragm 5 not vibrating properly, and a speaker device with stable performance is
provided. There was a problem of being unable to
[0006]
The present invention has been made in consideration of the above circumstances, and an object
of the present invention is to provide a small speaker device which does not require the provision
of a separate box on the back of the frame.
[0007]
Another object of the present invention is to provide a compact speaker apparatus with stable
performance.
[0008]
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SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the invention
according to claim 1 is a magnetic circuit section comprising a voice coil attached to a
diaphragm, a soft magnetic member and a magnet and having a magnetic gap. And a frame for
supporting the periphery of the diaphragm and the magnetic circuit portion, and a lead terminal
electrically connected to the terminal of the voice coil, and integrally with the frame at least from
the vicinity of the outer periphery of the frame. A side wall portion extending to the magnetic
circuit portion side is formed, and the inside of the side wall portion is sealed by a sealing means
to form a cabinet space.
[0009]
According to the first aspect of the present invention, the side wall portion extending toward the
magnetic circuit portion from at least the periphery of the frame integrally with the frame is
formed, and the inside of the side wall portion is sealed by the sealing means to form a cabinet
space. It is not necessary to provide a separate box on the back of the frame, and the assembly
efficiency as a speaker device can be greatly improved.
[0010]
The invention according to claim 2 is characterized in that, in the small speaker device according
to claim 1, the sealing means is a cover for sealing.
[0011]
According to the second aspect of the invention, by forming the sealing means as the sealing
cover, the inside of the side wall portion of the frame can be easily made into the cabinet space.
[0012]
The invention according to claim 3 is characterized in that, in the small-sized speaker device
according to claim 1, the sealing means is either a housing to which the speaker device main
body is attached or a main body substrate.
[0013]
According to the third aspect of the present invention, by making the sealing means any of the
housing and the main body substrate to which the speaker device main body is attached, the
inside of the side wall portion of the frame is made a cabinet space without newly providing the
sealing means. be able to.
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[0014]
The invention according to claim 4 is characterized in that, in the small speaker device according
to claim 1 or 2, the lead terminal is a lead substrate formed on the back surface of the sealing
cover.
[0015]
According to the fourth aspect of the present invention, by forming the lead terminal as the lead
substrate formed on the back surface of the sealing cover, the lead substrate is not formed on the
back surface of the frame, and air can be applied to the diaphragm. The back holes for adjusting
the back pressure can be arranged evenly in the circumferential direction, and causes such as
rolling can be reduced.
[0016]
The invention according to claim 5 is characterized in that, in the small speaker device according
to claim 1, the lead terminal is provided on a side wall portion of the frame.
[0017]
According to the fifth aspect of the present invention, by providing the lead terminals on the side
wall portion of the frame, it is not necessary to form the lead substrate on the back surface of the
frame as in the fourth aspect of the invention. Thus, the back holes for adjusting the back
pressure of air can be evenly arranged in the circumferential direction, and causes such as rolling
can be reduced.
[0018]
According to a sixth aspect of the present invention, in the small speaker device according to the
first or second aspect, the lead terminal is provided so as to be separated from the side wall of
the frame with respect to the back of the frame and extend in the inner circumferential direction.
It is characterized by
[0019]
According to the sixth aspect of the present invention, the lead terminals are spaced apart from
the side wall portion of the frame with respect to the rear face of the frame and extend in the
inner circumferential direction, thereby providing the rear face of the frame in the same manner
as the fourth aspect. Since the lead substrate is not formed on the diaphragm, the back holes for
adjusting the back pressure of air can be evenly arranged in the circumferential direction with
respect to the diaphragm, and the causes such as rolling can be reduced.
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[0020]
The invention according to claim 7 is characterized in that, in the small-sized speaker device
according to claim 1, the magnetic circuit unit is any of an internal magnet type and an external
magnet type.
[0021]
According to the seventh aspect of the present invention, by making the magnetic circuit unit
either of the internal magnet type or the external magnet type, it is possible to apply to either the
internal magnet type or the external magnet type magnetic circuit unit, It is possible to provide a
highly versatile compact speaker device.
[0022]
The invention according to claim 8 is characterized in that the small speaker device according to
claim 1 is a box type speaker such as a sealed type or a bass reflex type by a cabinet space.
[0023]
According to the eighth aspect of the present invention, by making the cabinet space into a
sealed type or a bass reflex type box type speaker, it is possible to greatly improve the assembly
efficiency as the speaker device.
[0024]
BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be
described below with reference to the drawings.
[0025]
(First Embodiment) FIGS. 1A to 1C are a plan view, a cross sectional view and a rear view
showing a first embodiment of a small speaker device according to the present invention.
[0026]
As shown in FIGS. 1A to 1C, the small speaker device of the present embodiment has a frame 10,
which is integrally formed of plastic in a planar circular shape and has an inner wall 11 having a
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hole at the center. And a side wall portion 14 continuously provided to the inner wall portion 11
via the flat portion 12 and the step portion 13 and formed on the outer peripheral edge of the
frame 10 and a front surface side of the side wall portion 14 A projecting portion 14 a, a stepped
portion 14 b formed on the back side of the side wall portion 14, and a large number of back
holes 15 are formed in the flat portion 12 at regular intervals in the circumferential direction.
A tone and tuning cloth (not shown) made of non-woven fabric is adhered to these back holes 15,
and the pressure in the diaphragm described later is adjusted by this tuning cloth.
[0027]
In the frame 10, a yoke 16 formed in a dish shape by drawing a soft magnetic member is
integrally formed by insert molding, and a permanent magnet 17 and a soft magnetic member
are formed on the recess 16a of the yoke 16. A disc-shaped plate 18 pressed out is sequentially
placed.
Here, the yoke 16, the permanent magnet 17, and the plate 18 constitute a magnetic circuit
portion 19, and the side surface of the plate 18 and the rising portion of the yoke 16 constitute a
magnetic gap.
[0028]
Furthermore, the peripheral edge of the diaphragm 20 which is formed into a desired shape by
heating, for example, a polyester sheet material is placed on the step portion 13 of the frame 10,
and the contact surface is fixed by an adhesive. A U-groove 20a of a plane circular shape is
formed on the inside of the U-groove 20a, and a voice coil 21 which is wound in a hollow
cylindrical shape and subjected to a fixing process and is solidly integrated is fixed by an
adhesive.
Then, a notch groove 23 for passing an end 22 of the winding of the voice coil 21 is formed in a
part of the side wall portion 14 of the frame 10.
[0029]
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In addition, a sealing cover 24 as a sealing means is fitted to the stepped portion 14b formed on
the back side of the side wall 14, and the side wall 14 is sealed. A voice coil is formed on the back
of the sealing cover 24. Two lead substrates 25 as lead terminals electrically connected to the
end 22 of the winding 21 are formed apart from each other.
The lead substrate 25 is electrically connected to a main substrate (not shown) or the like.
[0030]
On the other hand, a case cap 26 in which a large number of vent holes 26a are bored is
attached to a projecting portion 14a formed on the front side of the side wall portion 14, and the
case cap 26 and the projecting portion 14a of the side wall portion 14 are attached. The contact
surfaces of are bonded by an adhesive.
[0031]
As described above, in the present embodiment, the side wall portion 14 extending from the
outer periphery of the frame 10 to the magnetic circuit portion 19 side is formed integrally with
the frame 10 and the inside of the side wall portion 14 is sealed by the sealing cover 24. Form.
[0032]
Next, the assembly order of the small speaker device of the present embodiment configured as
described above will be described.
[0033]
First, the yoke 16 is integrally formed on the frame 10 by insert molding, and the permanent
magnet 17 and the plate 18 are sequentially mounted and fixed on the recess 16 a of the yoke
16.
Then, after the periphery of the diaphragm 20 is fitted to the step 13 of the frame 10 and the
contact surface is fixed with an adhesive, the voice coil 21 solidly integrated in the U groove 20a
of the diaphragm 20 is It is fixed by an adhesive.
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[0034]
Further, the sealing cover 24 is engaged with the stepped portion 14b formed on the rear surface
side of the side wall portion 14 of the frame 10 to be sealed.
Then, the end 22 of the winding of the voice coil 21 is guided in the outer peripheral direction
along the shape of the diaphragm 20 from the mounting position of the voice coil 21, and then
the notch groove 23 formed in the side wall portion 14 of the frame 10 is used. Then, the lead
substrate 25 is electrically connected.
[0035]
Next, a case cap 26 is attached to a projecting portion 14a formed to project from the front side
of the side wall portion 14. A contact surface between the case cap 26 and the projecting portion
14a of the side wall portion 14 is adhered by an adhesive.
[0036]
As described above, according to the present embodiment, the side wall portion 14 extending
from the outer periphery of the frame 10 toward the magnetic circuit portion 19 is formed
integrally with the frame 10 and the inside of the side wall portion 14 is sealed by the sealing
cover 24. By forming the space, it is not necessary to provide a separate box on the back of the
frame 10.
As a result, the number of attachment steps and the number of parts of the box can be reduced,
and the assembly efficiency as a speaker device can be greatly improved.
[0037]
Further, in the present embodiment, by using the sealing cover 24, the inside of the side wall
portion 14 of the frame 10 can be easily made into a cabinet space, and a closed type or a bath
reflex cabinet (hereinafter abbreviated as a bass reflex, a ventilating hole) It can be used as a box
speaker of the type which is also referred to as a baffle.
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[0038]
Furthermore, in the present embodiment, the lead terminal is made to be the lead substrate 25
formed on the back surface of the sealing cover 24, so that the lead substrate is not formed on
the back surface of the frame 10. The back holes 15 for adjusting the pressure can be arranged
evenly in the circumferential direction, and causes such as rolling can be reduced.
[0039]
In the present embodiment, the side wall portion 14 is formed on the outer peripheral edge of
the frame 10, but the side wall portion 14 may be formed at least in the vicinity of the outer
periphery of the frame 10 avoiding the back surface hole 15.
[0040]
Second Embodiment FIGS. 2A to 2C are a plan view, a sectional view and a rear view showing a
second embodiment of the small speaker device according to the present invention.
In the same or corresponding parts as in the first embodiment, the same reference numerals as in
FIG. 1 will be used to explain only the configuration different from the first embodiment.
The other embodiments are the same.
[0041]
As shown in FIGS. 2A to 2C, in the small-sized speaker device of the present embodiment, the
back side of the side wall portion 14 of the frame 10 is formed in a square unlike the small-sized
speaker device of the first embodiment. At the same time, the sealing cover 24 as a sealing
means is also formed in a square shape.
The other configuration and operation are the same as those of the first embodiment, and thus
the description thereof is omitted.
[0042]
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As described above, according to the present embodiment, since the back side of the side wall
portion 14 of the frame 10 is formed in a square shape, the dead space can be reduced when the
speaker device body is mounted on the main body substrate or the like.
[0043]
Third Embodiment FIGS. 3A to 3C are a plan view, a cross sectional view and a rear view showing
a third embodiment of the small speaker device according to the present invention.
[0044]
As shown in FIGS. 3A to 3C, the small-sized speaker device of the present embodiment differs
from the small-sized speaker device of the first embodiment in that a stepped portion 27 is
formed on the front outer periphery of the side wall portion 14 of the frame 10. Is formed, and a
notch 28 is formed in which a part thereof is largely cut out on the inner peripheral side.
Further, on the inner peripheral side of the stepped portion 27, a projecting portion 14a formed
to project on the front side of the side wall portion 14 is provided, and a case cap 26 in which a
large number of air holes 26a are formed in the projecting portion 14a. It is applied.
The other configuration and operation are the same as those of the first embodiment, and thus
the description thereof is omitted.
[0045]
As described above, according to the present embodiment, the end 21 of the winding of the voice
coil 20 is formed on the lead substrate 25 by forming the cutout groove 28 in which a part of the
side wall portion 14 of the frame 10 is largely cut away on the inner peripheral side. The work
that leads to
[0046]
Further, according to the present embodiment, the case 14 is attached by providing the
protrusion 14a to which the case cap 26 is attached to the inner periphery of the stepped portion
27 formed on the front outer periphery of the side wall 14 The peripheral edge of the cap 26 is
less likely to interfere with other members, and the case cap 26 can be prevented from coming
off unexpectedly.
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[0047]
Fourth Embodiment FIGS. 4A to 4C are a plan view, a cross sectional view and a rear view
showing a fourth embodiment of the small speaker device according to the present invention.
[0048]
As shown in FIGS. 4A to 4C, the small speaker device of the present embodiment is different from
the small speaker device of the first embodiment in that the side wall portion 14 is not sealed by
the sealing cover 24 and the speaker device is A cabinet space is formed by directly attaching the
main body to a housing or main body substrate as a sealing means (not shown).
[0049]
Further, a lead terminal 29 is provided in the cutout groove 23 formed in the side wall portion
14 of the frame 10, and the terminal 22 of the winding of the voice coil 21 is electrically
connected to the lead terminal 29.
The lead terminal 29 is electrically connected directly to the wiring pattern of the main body
substrate, or connected to a lead wire to the lead terminal 29 and electrically connected to the
wiring pattern of the main body substrate or the housing through the lead wire. Be done.
The other configuration and operation are the same as those of the first embodiment, and thus
the description thereof is omitted.
[0050]
As described above, according to the present embodiment, the sealing means for sealing the side
wall portion 14 of the frame 10 is either the housing to which the speaker device main body is
attached or the main body substrate, thereby providing the frame without newly providing
sealing means. The inside of the side wall portion 14 of 10 can be a cabinet space, and can be a
closed or bass reflex box speaker.
[0051]
Further, according to the present embodiment, since the lead terminals 29 are provided on the
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side wall portion 14 of the frame 10, there is no need to form a lead substrate on the back
surface of the frame 10, and the back pressure of air against the diaphragm 20 can be obtained.
The back holes 15 for adjustment can be evenly arranged in the circumferential direction, and
causes such as rolling can be reduced.
[0052]
Fifth Embodiment FIGS. 5A to 5C are a plan view, a sectional view and a rear view showing a fifth
embodiment of the small speaker device according to the present invention.
[0053]
As shown in FIGS. 5A to 5C, in the small speaker device of the present embodiment, the side wall
portion 14 is not sealed by the sealing cover 24 as in the small speaker device of the fourth
embodiment. The cabinet body is formed by directly attaching the apparatus main body to a
housing or main body substrate as a sealing means (not shown).
[0054]
Further, in the present embodiment, the end 22 of the winding of the voice coil 21 is guided to
the notch groove 23 of the side wall portion 14 of the frame 10, and this end 22 is separated
from the side wall portion 14 of the frame 10 with respect to the back surface of the frame 10. It
is connected to two metal lead terminals 30 extending in the inner circumferential direction.
The lead terminals 30 are directly electrically connected to the wiring pattern of the main body
substrate when the speaker device main body is attached to the main body substrate (not shown).
The other configuration and operation are the same as those of the fourth embodiment, and thus
the description thereof is omitted.
[0055]
As described above, according to the present embodiment, the lead terminal 30 is provided apart
from the side wall portion 14 of the frame 10 with respect to the back surface of the frame 10
and extends in the inner circumferential direction. No lead substrate is formed on the back
surface of the disc, and the back holes 15 for adjusting the back pressure of air to the diaphragm
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20 can be evenly disposed in the circumferential direction, thereby reducing causes such as
rolling Can.
[0056]
Further, according to the present embodiment, the sealing means for sealing the side wall portion
14 of the frame 10 is either the housing to which the speaker device main body is attached or
the main body substrate, thereby newly sealing means as in the fourth embodiment. In the side
wall part 14 of the flame | frame 10, it can be set as cabinet space, and it can be set as a closed
type or a bass reflex type box speaker.
[0057]
The present invention is not limited to the above embodiments, and various modifications can be
made.
For example, although the magnetic circuit portion 19 is of the internal magnet type in the above
embodiments, the shape of the yoke 16 may be changed to be of the external magnet type.
As a result, in the present invention, the present invention can be applied to any of the magnetic
circuit units of the inner magnet type and the outer magnet type, and a compact speaker device
with high versatility can be provided.
[0058]
As described above, according to the first aspect of the present invention, the side wall portion is
formed integrally with the frame and extends at least from the vicinity of the outer periphery of
the frame to the magnetic circuit portion side. Because the cabinet space is hermetically sealed, it
is not necessary to provide a separate box on the back of the frame, and the assembly efficiency
as a speaker device can be significantly improved.
[0059]
According to the second aspect of the invention, in addition to the effects of the first aspect of
the invention, the inside of the side wall portion of the frame can be easily made a cabinet space
by making the sealing means a sealing cover.
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[0060]
According to the third aspect of the present invention, in addition to the effect of the first aspect
of the present invention, the sealing means is newly provided by setting either the housing to
which the speaker device main body is attached or the main body substrate. Therefore, the inside
of the side wall of the frame can be made into a cabinet space.
[0061]
According to the invention of claim 4, in addition to the effect of the invention of claim 1 or 2,
the lead terminal is a lead substrate formed on the back surface of the sealing cover, so that the
lead substrate is formed on the back surface of the frame. It is possible to evenly arrange the
back holes for adjusting the back pressure of air with respect to the diaphragm, thereby reducing
causes such as rolling.
As a result, it is possible to provide a small speaker device with stable performance.
[0062]
According to the invention of claim 5, in addition to the effect of the invention of claim 1, the
lead terminals are provided on the side wall portion of the frame, whereby the leads on the back
of the frame are the same as the invention of claim 4. There is no need to form a substrate, the
back holes for adjusting the back pressure of air to the diaphragm can be arranged evenly in the
circumferential direction, and causes such as rolling can be reduced.
As a result, it is possible to provide a small speaker device with stable performance.
[0063]
According to the invention of claim 6, in addition to the effect of the invention of claim 1 or 2,
the lead terminal is provided so as to extend from the side wall of the frame to the back of the
frame and extend in the inner circumferential direction. Accordingly, the lead substrate is not
formed on the back surface of the frame as in the invention according to claim 4, and the back
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holes for adjusting the back pressure of air are evenly arranged in the circumferential direction
with respect to the diaphragm. Can reduce the causes such as rolling.
As a result, it is possible to provide a small speaker device with stable performance.
[0064]
According to the seventh aspect of the present invention, in addition to the effects of the first
aspect, any of the inner magnetic type and the outer magnetic type can be obtained by making
the magnetic circuit portion either an inner magnetic type or an outer magnetic type. The
present invention can also be applied to any magnetic circuit unit, and a highly versatile compact
speaker device can be provided.
[0065]
According to the eighth aspect of the present invention, as in the first aspect, by making the
cabinet space into a sealed type or a bass reflex type box type speaker, the assembly efficiency as
a speaker device is greatly improved. be able to.
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