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JPWO2017018074

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This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
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DESCRIPTION JPWO2017018074
Abstract Improve acoustic characteristics without increasing manufacturing cost and increasing
size. A drive unit having a yoke formed of a magnetic material, a magnet attached to the yoke, a
coil to which a drive current is supplied, and an armature provided with a vibrating portion that
vibrates when the drive current is supplied to the coil; And a film attached to the holding frame
in a state covering the holding frame having the opening and the opening frame, and a
transmission beam for transmitting the vibration of the diaphragm and the vibrating portion held
inside the holding frame in a state attached to the film to the diaphragm And the entire periphery
of the outer periphery of the diaphragm is separated from the entire periphery of the inner
periphery of the holding frame.
Sound converter and voice output device
[0001]
The present technology relates to the technical field of an acoustic conversion device that
transmits the vibration of a vibration unit in an armature to a diaphragm by a transmission beam,
and an audio output device including the same.
[0002]
JP, 2012-4850, A JP, 2012-4851, A JP, 2012-4852, A JP, 2012-4853, A
[0003]
There is a sound conversion device which has a vibrator called an armature, which is
incorporated in various sound output devices such as headphones, earphones, and hearing aids,
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1
and functions as a small-sized speaker.
[0004]
In such an acoustic conversion device, the drive unit having the armature and the diaphragm unit
having the diaphragm are accommodated in the storage case, and when the vibrator of the
armature vibrates, the transmission beam transmits the vibration to the diaphragm, A voice
corresponding to the vibration of the diaphragm is output (see, for example, Patent Documents 1
to 4).
[0005]
In the acoustic conversion device described in Patent Document 1 to Patent Document 4, the
resin film is attached to the holding frame, the diaphragm is attached to the resin film, and one
end of the diaphragm is held by the adhesive. It is fixed to
A beam (transmission beam) is bent from the other end of the diaphragm to be integrally formed
with the diaphragm, and the tip of the beam is fixed to the tip of the vibrating part of the
armature by an adhesive.
[0006]
Therefore, when a current is supplied to the coil and the vibrating portion vibrates, the vibration
of the vibrating portion is transmitted from the transmission beam to the vibrating plate to
vibrate the vibrating plate, and a sound corresponding to the vibration of the vibrating plate is
output.
At this time, since the diaphragm is fixed to the holding frame by the adhesive at one end, it
vibrates in a cantilever state with the bonded portion as a fulcrum.
By vibrating with the portion to which the diaphragm is bonded as a fulcrum in this manner, the
variation in sound pressure particularly in the high frequency region is suppressed, and a stable
sound pressure can be obtained.
10-05-2019
2
[0007]
Incidentally, since the acoustic conversion device is used not only in the high frequency region
but also in the low frequency region, it is desirable that the acoustic characteristics in the low
frequency region be improved.
[0008]
As means for improving the acoustic characteristics not only in the high frequency region but
also in the low frequency region, for example, there is a means for increasing the amplitude of
the drive unit in the armature, but in this case, the input voltage and conversion efficiency need
to be raised Power consumption may increase.
[0009]
Further, as a means for improving the acoustic characteristics not only in the high frequency
region but also in the low frequency region, for example, there is a means for increasing the area
of the diaphragm, but in this case the holding frame etc. It is necessary to increase the size of the
other members, which may lead to an increase in the size of the sound conversion apparatus and
the sound output apparatus including the sound conversion apparatus.
[0010]
SUMMARY OF THE INVENTION An object of the present invention is to solve the abovementioned problems and to improve the acoustic characteristics without increasing the
manufacturing cost and increasing the size.
[0011]
First, an acoustic transducer according to the present technology vibrates when a yoke formed of
a magnetic material, a magnet attached to the yoke, a coil to which a drive current is supplied,
and the coil are supplied with the drive current. A holding frame having an opening, a film
attached to the holding frame in a state covering the opening, and a holding frame having an
opening, and a state of the holding frame being attached to the film A diaphragm unit having a
diaphragm held inside and a transmission beam for transmitting the vibration of the vibrating
portion to the diaphragm, wherein the entire periphery of the diaphragm is the entire periphery
of the inner periphery of the holding frame It was separated from
[0012]
As a result, the diaphragm is held by the film inside the inner periphery of the holding frame, and
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3
when vibration is transmitted from the transmission beam to the diaphragm, the diaphragm is
easily translated in the thickness direction.
[0013]
Second, in the above-described acoustic conversion device, it is desirable that the distance
between the entire periphery of the outer periphery of the diaphragm and the entire periphery of
the inner periphery of the holding frame be constant.
[0014]
Thereby, the distance between the outer periphery of the diaphragm and the inner periphery of
the holding frame becomes constant over the entire periphery.
[0015]
Third, in the above-described acoustic conversion device, it is desirable that the inner periphery
of the corner portion of the holding frame is formed in a curved shape.
[0016]
Thus, when the diaphragm vibrates, stress concentration does not occur at the corner portions of
the holding frame.
[0017]
Fourth, in the above-described acoustic conversion device, it is desirable that the outer periphery
at the corner portion of the diaphragm is formed in a curved shape.
[0018]
Thus, when the diaphragm vibrates, stress concentration does not occur at the corner portions of
the diaphragm.
[0019]
Fifth, in the above-described acoustic conversion device, it is preferable that the transmission
beam is formed by being bent from the diaphragm.
[0020]
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4
Thereby, the transmission beam and the diaphragm are integrally formed.
[0021]
Sixth, in the above-described acoustic conversion device, the transmission beam includes a base
continuous with the diaphragm and a connecting portion continuous with the base and
connected to the vibrating portion, and the width of the base is the connection It is desirable to
be larger than the width of the part.
[0022]
As a result, the width of the continuous portion of the transmission beam with the diaphragm
increases and the strength of the transmission beam increases.
[0023]
Seventh, in the above-described acoustic conversion device, it is preferable that the width of the
base and the width of the connecting portion be each made constant.
[0024]
As a result, the base and the connecting portion have the same strength regardless of their
positions in the continuous direction.
[0025]
Eighth, in the above-described acoustic conversion device, it is desirable that a reinforcing rib be
formed on the diaphragm.
[0026]
Thereby, the strength of the diaphragm is increased, and the deflection of the diaphragm is
suppressed at the time of vibration.
[0027]
Ninth, in the above-described acoustic conversion device, it is preferable that a rib is formed on
the transmission beam.
[0028]
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5
As a result, the strength of the transfer beam is increased, and the deflection of the transfer beam
is suppressed at the time of vibration.
[0029]
Tenthly, in the above-described acoustic conversion device, there is provided a case body for
accommodating the drive unit and the diaphragm unit, and a cover body, and an audio output for
outputting an audio generated when a vibration is transmitted to the diaphragm. It is desirable to
have a storage unit in which a hole is formed.
[0030]
Thus, the drive unit and the diaphragm unit are protected by the storage unit.
[0031]
Eleventh, an audio output device according to the present technology includes a first acoustic
conversion device and a second acoustic conversion device, and both the first acoustic
conversion device and the second acoustic conversion device are magnets and A drive unit
having a coil to which a drive current is supplied and an armature provided with a vibrating
portion that vibrates when the drive current is supplied to the coil, a holding frame having an
opening, and the holding in a state covering the opening A diaphragm unit having a film affixed
to a frame, a diaphragm held inside the holding frame in a state of being affixed to the film, and a
transmission beam for transmitting the vibration of the vibrator to the diaphragm; The first
acoustic transducer is spaced from the entire circumference of the inner periphery of the holding
frame in the outer circumference of the diaphragm, and the second acoustic transducer holds the
one end of the diaphragm in the holding state Inner circumference of the frame Those fixed to.
[0032]
Thus, in the first acoustic transducer, the diaphragm is held by the film inside the inner periphery
of the holding frame, and when vibration is transmitted from the transmission beam to the
diaphragm, the diaphragm is easily translated in the thickness direction Become.
[0033]
Twelfth, in the sound output apparatus described above, in both the first acoustic conversion
device and the second acoustic conversion device, the transmission beam is formed by being bent
from the diaphragm, and the first sound is generated. Preferably, the width of the bent portion of
the transmission beam from the diaphragm in the conversion device is larger than the width of
the bent portion of the transmission beam from the diaphragm in the second acoustic transducer.
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[0034]
As a result, the transmission beam of the first acoustic conversion device and the transmission
beam of the second acoustic conversion device are formed to have suitable strength in the low
frequency region and the high frequency region, respectively.
[0035]
Thirteenth, in the sound output apparatus described above, it is desirable that the thickness of
the diaphragm in the first acoustic conversion device be thicker than the thickness of the
diaphragm in the second acoustic conversion device.
[0036]
Thereby, the diaphragm of the first acoustic conversion device and the diaphragm of the second
acoustic conversion device are formed to have suitable strength in the low frequency region and
the high frequency region, respectively.
[0037]
In the present technology, the diaphragm is held by the film inside the inner periphery of the
holding frame, and the diaphragm is easily translated in the thickness direction when the
vibration is transmitted from the transmission beam to the diaphragm. Therefore, the acoustic
characteristics can be improved without increasing the manufacturing cost and increasing the
size.
[0038]
FIGS. 2 to 18 show an embodiment of an acoustic conversion device and an audio output device
according to the present technology, and this figure is an exploded perspective view of the
acoustic conversion device.
It is an expansion perspective view of an acoustic converter.
It is an expanded sectional view of an acoustic converter.
10-05-2019
7
It is an enlarged front view which shows the state with which the drive unit and the diaphragm
unit were couple | bonded.
It is an expansion disassembled perspective view of a drive unit.
It is an expansion perspective view of a drive unit.
It is an enlarged plan view of a diaphragm unit.
It is an expansion perspective view of a diaphragm and a transmission beam.
It is an expansion perspective view showing the state where the diaphragm unit was fixed to the
drive unit.
It is a disassembled perspective view which shows the state in which the drive unit and the
diaphragm unit were accommodated in the case body.
It is an expanded sectional view showing the state before loading the 1st seal agent into the
maintenance frame of a diaphragm unit.
It is an expanded sectional view which shows the state in which the cover body was mounted in
the film.
It is an expanded sectional view which shows the state by which the 1st sealing agent loaded by
the holding frame of the diaphragm unit was filled in clearance gap.
It is a conceptual diagram which shows the state which the diaphragm vibrates and translates.
10-05-2019
8
It is a graph which shows the result of having measured about acoustic characteristics.
It is a conceptual diagram of an audio output device.
It is an enlarged plan view of the diaphragm unit in a 2nd acoustic converter.
FIG. 6 is an enlarged perspective view of a diaphragm and a transmission beam in a second
acoustic transducer.
[0039]
Hereinafter, embodiments of an acoustic conversion device and an audio output device of the
present technology will be described according to the attached drawings.
[0040]
In the following description, it is assumed that the direction in which the sound is output is
upper, indicating the front, rear, upper, lower, left, and right directions.
In addition, the directions of front and rear, upper and lower, right and left shown below are for
convenience of explanation, and it is not limited to these directions about implementation of this
art.
[0041]
<Overall Configuration> The acoustic conversion device 1 comprises a drive unit 2, a diaphragm
unit 3 and a storage unit 4 (see FIGS. 1 to 3).
The sound conversion device 1 is used by being incorporated into various sound output devices
such as, for example, headphones, earphones, and hearing aids.
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9
[0042]
The drive unit 2 includes a yoke 5, a pair of magnets 6 and 6, a coil 7, connection terminals 8
and 8, and an armature 9 (see FIGS. 1 and 3).
[0043]
The yoke 5 is formed of a magnetic material, and is formed by coupling a flat plate-shaped first
member 10 facing in the vertical direction and a U-shaped second member 11 opened upward.
The second member 11 is composed of a bottom surface portion 11a facing in the vertical
direction and side surface portions 11b and 11b projecting upward from the left and right end
portions of the bottom surface portion 11a.
[0044]
The left and right side surfaces of the first member 10 are attached to the inner surfaces of the
side surface portions 11 b and 11 b of the second member 11 by, for example, welding or
adhesion.
The yoke 5 is formed in a rectangular tube shape in which the first member 10 and the second
member 11 are combined and penetrated back and forth.
[0045]
The magnets 6 and 6 are disposed in a state of being separated and opposed in the vertical
direction, and the poles on the opposite side are different.
The upper magnet 6 is attached to the lower surface of the first member 10, and the lower
magnet 6 is attached to the upper surface of the bottom surface 11a of the second member 11
(see FIG. 4).
10-05-2019
10
[0046]
The coil 7 is wound around a coil bobbin 12 (see FIGS. 1 and 3).
The coil bobbin 12 has a coil winding portion 13 which is open at the top and bottom and
penetrates back and forth, and a terminal holding portion 14 which protrudes rearward from an
upper end portion of the rear surface of the coil winding portion 13.
At the front end portion of the coil winding portion 13, receiving protrusions 13a, 13a are
provided which are projected leftward and rightward.
[0047]
The coil 7 is wound around the coil winding portion 13 in a state in which the axial direction is in
the front-rear direction.
[0048]
The connection terminals 8, 8 are held by the terminal holding portion 14 of the coil bobbin 12
in a state of being aligned left and right.
The connection terminal 8 includes a buried portion 8a which is buried and held in the terminal
holding portion 14, a coil connection portion 8b which protrudes laterally from the buried
portion 8a, and a terminal portion 8c which protrudes rearward from the buried portion 8a. The
coil connection portion 8 b protrudes laterally from the side surface of the terminal holding
portion 14, and the terminal portion 8 c protrudes rearward from the rear surface of the terminal
holding portion 14.
[0049]
Both ends of the coil 7 are respectively connected to coil connection portions 8 b and 8 b of
connection terminals 8 and 8.
10-05-2019
11
The terminal portions 8c, 8c are connected to an input signal source (not shown).
Therefore, an input signal is supplied to the coil 7 from the input signal source via the connection
terminals 8, 8.
[0050]
The armature 9 is integrally formed of magnetic metal materials.
The armature 9 is projected forward from the left and right end portions of the base portion 15
formed in a horizontally long shape facing in the vertical direction and the vibrating portion 16
projecting forward from the central portion in the left and right direction of the base portion 15
The fixed parts 17, 17 are integrally formed.
The vibrating portion 16 is formed in a plate shape facing in the up-down direction, and the fixed
portions 17, 17 are formed in a plate shape facing in the left-right direction.
The upper surfaces of the fixed portions 17 and 17 are formed as fixing surfaces 17a and 17a,
respectively.
[0051]
The coil bobbin 12 is attached to the armature 9 by adhering the coil 7 to the inner surfaces of
the fixed portions 17 (see FIGS. 3 and 5).
[0052]
In a state where the coil bobbin 12 is attached to the armature 9, the vibrating portion 16 is
penetrated through the coil winding portion 13 of the coil bobbin 12 and a part thereof is
projected forward from the coil 7 (see FIG. 3).
10-05-2019
12
At this time, the intermediate portions of the fixed portions 17, 17 are placed on the receiving
protrusions 13a, 13a of the coil bobbin 12, respectively, and positioning of the armature 9 with
respect to the coil bobbin 12 is performed (see FIG. 5).
[0053]
In the acoustic conversion device 1, the fixed portions 17 and 17 to which the coil 7 is attached
and the vibrating portion 16 penetrating the coil bobbin 12 are both provided in the armature 9.
Therefore, the position of the vibrating portion 16 with respect to the coil bobbin 12 and the coil
7 can be secured with high accuracy, and the positional accuracy of the vibrating portion 16 with
respect to the coil bobbin 12 and the coil 7 can be improved.
[0054]
The armature 9 is fixed to the outer surfaces of the side portions 11b of the yoke 5 by adhesion,
welding or the like in a state where the coil bobbin 12 is attached to the armature 9 (see FIGS. 4
and 6). .
[0055]
In a state where the armature 9 is fixed to the yoke 5, the fixing surfaces 17a, 17a of the
armature 9 are respectively located above the upper surfaces of the side portions 11b, 11b of the
yoke 5 (see FIG. 4).
[0056]
The diaphragm unit 3 comprises a holding frame 18, a film 19, a diaphragm 20 and a
transmission beam 21 (see FIGS. 1 and 3).
As the film 19, for example, a resin film or a paper film is used.
[0057]
10-05-2019
13
For example, the holding frame 18 is formed in a substantially rectangular frame shape in which
the length in the front-rear direction is made longer than the length in the left-right direction by
metal material, and the width in the left-right direction is made substantially the same as the
width in the left-right direction of the armature 9 ing.
The lower surface of the holding frame 18 is a first bonding surface 18a, and the upper surface is
a second bonding surface 18b.
[0058]
The film 19 has the same size as the outer shape of the holding frame 18, and is pasted by
adhesion or the like on the second joint surface 18b of the holding frame 18 so as to close the
opening 18c of the holding frame 18 (FIG. 3). reference).
[0059]
The holding frame 18 is formed so that four corner portions 22, 22, 23, 23 are rounded and not
angular (see FIG. 7).
The outer peripheries 22a, 22a of the front corner portions 22, 22 and the outer peripheries
23a, 23a of the rear corner portions 23, 23 are formed in an arc shape having the same
curvature.
Further, the inner circumferences 22b, 22b of the front corner portions 22, 22 are formed in an
arc shape having a curvature larger than the outer circumferences 22a, 22a, and the inner
circumferences 23b, 23b of the rear corner portions 23, 23 are the outer circumferences 23a, It
is formed in an arc shape having a curvature larger than that of 23a.
[0060]
The diaphragm 20 is formed in a substantially rectangular shape whose outer shape is one size
smaller than the inner shape of the holding frame 18.
10-05-2019
14
The vibration generated in the vibrating portion 16 of the armature 9 is transmitted to the
diaphragm 20 via the transmission beam 21.
[0061]
The diaphragm 20 is formed of a thin metal material such as aluminum or stainless steel.
The diaphragm 20 has a thickness T (see FIG. 3) of, for example, about 50 μm, and a width L in
the left-right direction (see FIG. 7) of, for example, about 2.3 mm.
[0062]
Weight reduction can be achieved by forming the diaphragm 20 of aluminum.
On the other hand, by forming the diaphragm 20 of stainless steel, the strength can be increased
to improve the transmission efficiency of the vibration from the vibrating portion 16 to the
diaphragm 20.
[0063]
The diaphragm 20 is provided with reinforcing ribs 20a, 20a, 20a extending longitudinally and
spaced apart from each other, and the reinforcing ribs 20a, 20a, 20a are formed in a shape
which is punched upward or downward (see FIG. 8).
[0064]
The diaphragm 20 is, for example, in a state of being attached to the film 19 from the lower side
(see FIG. 3).
[0065]
The diaphragm 20 is formed such that the four corner portions 24, 24, 25, 25 are rounded and
10-05-2019
15
not angular (see FIG. 7).
The outer peripheries 24a, 24a of the front corner portions 24, 24 are formed in an arc shape
having a curvature larger than the inner peripheries 22b, 22b of the front corner portions 22, 22
of the holding frame 18, respectively. The center and the centers of the arcs of the inner
circumferences 22b, 22b coincide with each other.
Further, the outer peripheries 25a, 25a of the rear corner portions 25, 25 are formed in an arc
shape having a curvature larger than the inner peripheries 23b, 23b of the rear corner portions
23, 23 of the holding frame 18, respectively. The center of the arc of 25a and the center of the
arc of the inner circumferences 23b, 23b are matched with each other.
[0066]
Thus, in the diaphragm unit 3, the outer shape of the diaphragm 20 is made smaller by one turn
than the inner shape of the holding frame 18, and the center of the arc of the outer periphery
24a, 24a and the center of the arc of the inner periphery 22b, 22b are They are respectively
matched, and the center of the arc of the outer circumferences 25a, 25a and the center of the arc
of the inner circumferences 23b, 23b are respectively matched.
[0067]
Therefore, the distance M between the inner shape of the holding frame 18 and the outer shape
of the diaphragm 20 is set to a certain size in the part excluding the entire circumference.
As will be described later, since the transmission beam 21 is formed by bending from the
diaphragm 20 and the bent part is positioned inside the other part of the outer periphery of the
diaphragm 20, the bent part and the vibration are vibrated. The distance M1 with the inner
periphery of the plate 20 is larger than the distance M2 between the unbent portion and the
inner periphery of the diaphragm 20. However, by changing the bending position of the
transmission beam 21 from the diaphragm 20, the distance M1 may be made the same size as
the distance M2 and the distance M may be made the same size all around.
[0068]
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16
The transmission beam 21 is integrally formed with the diaphragm 20, and is formed, for
example, by being bent downward from the diaphragm 20 (see FIG. 8). The transmission beam
21 is formed by being bent downward from the central portion in the left-right direction of the
front edge of the diaphragm 20. The bent portion 21 a in which the transmission beam 21 is
bent from the diaphragm 20 is positioned inside the other portion of the outer periphery of the
diaphragm 20. The width H in the left-right direction of the bent portion 21a is, for example,
about 1.1 mm.
[0069]
The transmission beam 21 may be formed separately from the diaphragm 20 and may be
attached to the diaphragm 20 by adhesion or welding. However, when the transmission beam 21
is formed separately from the diaphragm 20, it is desirable that the transmission beam 21 be
attached to the diaphragm 20 by welding in order to improve the strength.
[0070]
Further, the transmission beam 21 may be formed of, for example, a round shaft-shaped metal
column having a diameter of about 1 mm.
[0071]
The transmission beam 21 is formed in a plate shape facing in the front-rear direction, and
includes a base 26 connected to the diaphragm 20 and a connecting part 27 connected to the
lower end of the base 26.
The base 26 has a constant width in the left-right direction, and the side edges 26a, 26a are
formed in a straight line extending vertically. The connecting portion 27 has a constant width in
the lateral direction, and a width in the lateral direction is smaller than a width in the lateral
direction of the base 26. The connecting portion 27 is formed in a linear shape in which the side
edges 27a, 27a extend vertically, and the side edges 27a, 27a are positioned inside the side
edges 26a, 26a of the base portion 26, respectively.
[0072]
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17
A rib 21 b is formed on the transmission beam 21 so as to extend from the lower end to a
substantially central portion in the vertical direction of the base 26. The rib 21b is formed in a
shape that is punched forward or backward.
[0073]
As described above, in the acoustic conversion device 1, the transmission beam 21 has the base
portion 26 continuous to the diaphragm 20 and the connecting portion 27 continuous to the
base portion 26 and connected to the vibrating portion 16. The width is made larger than the
width of the connecting portion 27.
[0074]
Therefore, the width of the continuous portion (bent portion 21a) of the transmission beam 21
with the diaphragm 20 is increased, and the strength of the transmission beam 21 is increased,
and the transmission efficiency of the vibration from the vibration unit 16 to the diaphragm 20 is
improved. Can be
[0075]
Further, since the width of the base portion 26 and the width of the connecting portion 27 are
made constant, the base portion 26 and the connecting portion 27 have the same strength
regardless of their positions in the continuous direction (vertical direction). The transmission
efficiency of the vibration from the vibration plate 16 to the diaphragm 20 can be further
improved.
[0076]
Furthermore, since the reinforcing ribs 20a, 20a, 20a are formed on the diaphragm 20, the
strength of the diaphragm 20 is increased, and the deflection of the diaphragm 20 is suppressed
at the time of vibration, and the diaphragm 20 is displaced in the thickness direction. It becomes
easy to translate, and the favorable vibration state of the diaphragm 20 can be ensured.
[0077]
Furthermore, since the rib 21b is formed on the transmission beam 21, the strength of the
transmission beam 21 is increased, and the deflection of the transmission beam 21 is suppressed
at the time of vibration, so that the transmission efficiency of the vibration from the vibrating
portion 16 to the diaphragm 20 can be reduced. Further improvement can be achieved.
10-05-2019
18
[0078]
The diaphragm unit 3 is fixed to the drive unit 2 from above, for example, by adhesion or laser
welding (see FIGS. 3 and 9).
The diaphragm unit 3 is fixed by joining the first joint surface 18 a of the holding frame 18 to
the fixing surfaces 17 a formed on the fixed parts 17 of the armature 9.
[0079]
At the time of fixing the drive unit 2 to the diaphragm unit 3, the lower end of the transmission
beam 21 is fixed to the front end of the vibrating portion 16 in the armature 9 by the adhesive
28 (see FIGS. 3 and 4).
[0080]
As described above, since the transmission beam 21 is formed by being bent from the diaphragm
20, the transmission beam 21 and the diaphragm 20 are integrally formed, and only by fixing the
lower end portion of the transmission beam 21 to the vibration portion 16 The diaphragm 20
and the armature 9 are connected via the transmission beam 21, and the work efficiency in the
connection work of the diaphragm 20, the transmission beam 21 and the armature 9 can be
improved.
[0081]
In addition, since the transmission beam 21 is bent from the diaphragm 20 and formed, the
transmission beam 21 and the diaphragm 20 are integrally formed, and the lower end of the
transmission beam 21 is fixed to the vibrator 16 of the armature 9. There is no need to attach the
upper end of the transmission beam 21 to the diaphragm 20.
Therefore, it is not necessary to attach the upper end portion of the transmission beam 21 to the
diaphragm 20 by grooving, the shift of the connection position of the transmission beam 21 to
the diaphragm 20, the deformation of the transmission beam 21, the bending of the transmission
beam 21 to the diaphragm 20, etc. It is possible to improve the yield without causing it.
10-05-2019
19
[0082]
Furthermore, since the transmission beam 21 and the diaphragm 20 are integrally formed, the
number of parts in the acoustic conversion device 1 can be reduced, and at the same time, the
transmission efficiency of vibration from the vibrating portion 16 to the diaphragm 20 can be
improved. Can be
[0083]
The storage unit 4 is composed of a box-like case 29 opened upward and a shallow box-like
cover 30 opened downward (see FIGS. 1 to 3).
[0084]
The case body 29 is formed with an insertion notch 31 a opened at the upper end portion of the
rear surface portion 31 upward.
On the inner surface side of the upper end portion of the front surface portion 32 and the rear
surface portion 31 of the case body 29, there are formed mounting step surfaces 29a, 29a, 29a
facing upward.
[0085]
An audio output hole 30 a is formed in the cover body 30.
The sound output hole may be formed in the case body 29.
[0086]
As described above, in the drive unit 2 and the diaphragm unit 3, the first joint surface 18 a of
the holding frame 18 is joined to the fixed surfaces 17 a and 17 a of the armature 9, and the
lower end portion of the transmission beam 21 is the vibrating portion in the armature 9. It is
connected by being attached with adhesive 28 to the front end of 16.
10-05-2019
20
[0087]
The drive unit 2 and the diaphragm unit 3 thus combined are accommodated in the case body 29
from above (see FIG. 10).
[0088]
The diaphragm unit 3 housed in the case body 29 is positioned with the front and rear end
portions of the holding frame 18 mounted on the mounting step surfaces 29a, 29a, 29a of the
case body 29 (see FIG. 3).
At this time, a predetermined gap is formed between the lower surface of the drive unit 2 and the
upper surface of the bottom surface of the case body 29.
[0089]
In a state where the drive unit 2 and the diaphragm unit 3 are housed in the case body 29, the
second joint surface 18b of the holding frame 18 is positioned below the eyebrow directly inside
the upper end face 29b of the case body 29 (see FIG. See Figure 11).
At this time, a gap S is formed between the outer surface 18 d of the holding frame 18 and the
inner surface 29 c of the case body 29.
[0090]
Further, in a state where the drive unit 2 and the diaphragm unit 3 are housed in the case body
29, each part of the connection terminals 8, 8 is projected rearward from the insertion notch 31a
of the case body 29 (FIG. 3). And FIG. 10).
[0091]
The cover body 30 is placed on the outer peripheral portion of the upper surface 19a of the film
19 (see FIG. 12).
10-05-2019
21
[0092]
In a state where the cover 30 is placed on the upper surface 19a, the first sealing agent 33 is
loaded on the outer surface side of the cover 30 (see FIG. 13).
The first sealing agent 33 also has an adhesive function.
The first sealing agent 33 intrudes between the outer surface 18 d of the holding frame 18 and
the inner surface 29 c of the case body 29 and between the outer surface 30 b of the cover body
30 and the inner surface 29 c of the case body 29 and the gap S is sealed. The cover body 30 is
fixed to the case body 29 at the same time.
[0093]
Further, the second sealing agent (adhesive agent) 34 is applied to the gap between the opening
edge of the insertion notch 31a in the case body 29 and the connection terminals 8 and 8 for
sealing and bonding (FIG. 3). reference).
[0094]
As described above, in the sound conversion device 1, the drive unit 2 and the diaphragm unit 3
are housed in the housing unit 4 having the case body 29 and the cover body 30 and the audio
output hole 30a formed therein. Therefore, the drive unit 2 and the diaphragm unit 3 are
protected by the storage unit 4, and damage and breakage of the drive unit 2 and the diaphragm
unit 3 can be prevented.
[0095]
<Acoustic Characteristics> In the acoustic conversion device 1, when current is supplied to the
coil 7, the vibrating portion 16 of the armature 9 located between the pair of magnets 6 and 6 is
magnetized, and the polarity of the vibrating portion 16 is a magnet 6, 6 are repeatedly changed
at the position opposite to 6.
As the polarity is repeatedly changed, a minute vibration is generated in the vibrating portion 16,
and the generated vibration is transmitted from the transmission beam 21 to the diaphragm 20,
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and the transmitted vibration is amplified in the diaphragm 20 and converted into voice. It is
outputted from the sound output hole 30 a of the cover body 30.
[0096]
At this time, in order to suppress the variation in sound pressure in the frequency range of the
sound to be output and improve the acoustic characteristics, it is necessary to secure a good
vibration state of the diaphragm 20.
In particular, in order to improve the acoustic characteristics in the low frequency region, it is
desirable that the diaphragm 20 be displaced in the thickness direction and be translated.
[0097]
In the acoustic conversion device 1, as described above, the distance M is formed between the
entire periphery of the outer periphery of the diaphragm 20 and the entire periphery of the inner
periphery of the holding frame 18.
[0098]
Therefore, when the diaphragm 20 is held by the film 19 inside the inner periphery of the
holding frame 18 and vibration is transmitted from the vibrating portion 16 to the diaphragm 20
via the transmission beam 21, the diaphragm 20 translates in the thickness direction It is
exercised (see FIG. 14).
[0099]
As described above, in the acoustic conversion device 1, the amplitude M of the drive unit 16 is
increased because the distance M is formed on the entire circumference between the diaphragm
20 and the holding frame 18 to translate the diaphragm 20. It is possible to translate the
diaphragm 20 without increasing the area of the diaphragm 20.
[0100]
Accordingly, it is possible to improve the acoustic characteristics, in particular, in the low
frequency region, without increasing the manufacturing cost and increasing the size.
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[0101]
Hereinafter, the result of measuring the acoustic characteristic will be described (see FIG. 15).
[0102]
FIG. 15 is a graph showing frequency (Hz) on the horizontal axis and sensitivity (dB) on the
vertical axis.
[0103]
In FIG. 15, A indicates the frequency characteristic of the acoustic conversion device 1 in which
the distance M is formed on the entire circumference between the diaphragm 20 and the holding
frame 18, and B indicates one end (rear end) of the diaphragm as the holding frame. The
frequency characteristic of an acoustic transducer (acoustic transducer 1A described later) in
which the diaphragm is displaced in a cantilever state with one end as a fulcrum is shown.
[0104]
From the comparison of A and B in FIG. 15, it is understood that the sensitivity of the acoustic
conversion device 1 is higher than that of the conventional acoustic conversion device in the
frequency region of about 2000 Hz or less.
[0105]
From the above measurement results, it was confirmed that the acoustic conversion device 1 has
high sensitivity in the low frequency region, and the acoustic characteristics are improved.
[0106]
In particular, in the acoustic conversion device 1, as described above, since the magnitude of the
distance M is constant over the entire circumference, the distance between the outer
circumference of the diaphragm 20 and the inner circumference of the holding frame 18 is
constant. A stable balance with respect to the holding frame 18 of the diaphragm 20 is secured,
and the diaphragm 20 can be more easily translated, and a favorable vibration state of the
diaphragm 20 can be ensured.
[0107]
Further, since the inner circumferences 22b, 22b, 23b, 23b at the corner portions 22, 22, 23, 23
of the holding frame 18 are formed in a curved shape, the corner angles of the holding frame 18
when the diaphragm 20 vibrates. Stress concentration does not occur in the portions 22, 22, 23,
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23. Thus, it is possible to secure a better vibration state of the diaphragm 20.
[0108]
Furthermore, since the outer peripheries 24a, 24a, 25a, 25a at the corner portions 24, 24, 25, 25
of the diaphragm 20 are also formed in a curved shape, the corner portions of the diaphragm 20
when the diaphragm 20 vibrates. Stress concentration does not occur in the regions 24, 24, 25
and 25, and a better vibration state of the diaphragm 20 can be secured.
[0109]
<Audio Output Device> As shown in FIG. 15, in the acoustic conversion device 1, there is a
possibility that sufficient sensitivity may not be secured in the high frequency region.
[0110]
In this case, for example, in addition to the sound conversion device 1, the sound conversion
device 1A for high sound which can ensure high sound characteristics in a high frequency region
is incorporated into the sound output device 100 such as a headphone, earphone or hearing aid.
(See Figure 16).
The acoustic conversion device 1 is used as a first acoustic conversion device, and the acoustic
conversion device 1A is used as a second acoustic conversion device.
The acoustic conversion device 1A may be used as a device corresponding to the full range.
[0111]
The acoustic conversion device 1A includes, for example, the drive unit 2, the diaphragm unit 3A,
and the storage unit 4, and includes the diaphragm unit 3A having a configuration that is
partially different from the diaphragm unit 3 of the acoustic conversion device 1 17 and 18).
The acoustic conversion device 1A differs from the diaphragm unit 3A only in the partial
configuration of the diaphragm unit 3A, so the following description of the acoustic conversion
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device 1A will be described in detail only for the different configuration.
[0112]
The diaphragm unit 3A comprises a holding frame 18, a film 19, a diaphragm 20A and a
transmission beam 21A.
[0113]
The diaphragm 20A has the same width in the left-right direction as the diaphragm 20, but the
length in the front-rear direction is made longer and the thickness TA is reduced.
The diaphragm 20 has a thickness TA of, for example, about 30 μm, and is thinner than the
thickness T of the diaphragm 20.
[0114]
The rear end portion of the diaphragm 20A is fixed to the inner peripheral portion of the holding
frame 18 by a fixing adhesive 35.
[0115]
The transmission beam 21A is integrally formed with the diaphragm 20A, and is formed, for
example, by being bent downward from the diaphragm 20A.
The width HA in the left-right direction of the bent portion 21a bent from the diaphragm 20A of
the transmission beam 21A is, for example, about 0.7 mm, which is smaller than the width H of
the bent portion 21a of the transmission beam 21.
[0116]
The transmission beam 21A may be formed of, for example, a round axis metal column.
[0117]
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In the acoustic conversion device 1A, when current is supplied to the coil 7 and the vibrating
portion 16 vibrates, the vibration of the vibrating portion 16 is transmitted from the
transmission beam 21A to the vibrating plate 20A to vibrate the vibrating plate 20A, thereby
vibrating the vibrating plate 20A. The voice according to is output.
At this time, since one end of the diaphragm 20A is fixed to the inner peripheral portion of the
holding frame 18, the diaphragm 20A vibrates in a cantilever state with the bonded portion as a
fulcrum.
By vibrating with the portion to which the diaphragm 20A is bonded as a fulcrum as described
above, particularly, the variation of the sound pressure in the high frequency region is
suppressed, and a stable sound pressure can be obtained.
[0118]
Accordingly, the acoustic conversion device 1 having the diaphragm 20 whose entire outer
periphery is separated from the entire periphery of the inner periphery of the holding frame 18
and the acoustic transducer 1 having the diaphragm 20A whose one end is fixed to the inner
periphery of the holding frame 18 By using the conversion device 1A, it is possible to improve
the acoustic characteristics without increasing the manufacturing cost and increasing the size in
the entire region of the audio output region of the low frequency region and the high frequency
region.
[0119]
Further, since the width H of the bent portion 21a of the transmission beam 21 in the acoustic
conversion device 1 is larger than the width HA of the bent portion 21A of the transmission
beam 21A in the acoustic conversion device 1A, the strength of the transmission beam 21 is the
transmission beam It becomes higher than the strength of 21A.
[0120]
Therefore, the transmission beam 21 and the transmission beam 21A are formed to have suitable
strengths in the low frequency region and the high frequency region, respectively, to further
improve the acoustic characteristics in the entire sound output region of the low frequency
region and the high frequency region. be able to.
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[0121]
Furthermore, since the thickness T of the diaphragm 20 in the acoustic conversion device 1 is
greater than the thickness TA of the diaphragm 20A in the acoustic conversion device 1A, the
strength of the diaphragm 20 is higher than the strength of the diaphragm 20A.
[0122]
Therefore, the diaphragm 20 and the diaphragm 20A are formed to have suitable strengths in
the low frequency region and the high frequency region, respectively, to further improve the
acoustic characteristics in the entire region of the audio output region in the low frequency
region and the high frequency region. Can be
[0123]
By configuring the audio output device 100 using the acoustic conversion device 1 and the
acoustic conversion device 1A, the acoustic conversion device 1A differs from the diaphragm unit
3 only in the configuration of a part of the diaphragm unit 3A. With regard to the device 1 and
the acoustic conversion device 1A, parts other than the diaphragm unit 3 and 3A can be made
common.
[0124]
Therefore, the design of the audio output device 100 can be simplified and the manufacturing
cost can be reduced.
[0125]
Incidentally, by incorporating a low pass filter in the acoustic conversion device 1 and
incorporating a high pass filter in the acoustic conversion device 1A, the overlap between the
high and low tones is suppressed and good acoustics in the low frequency region and the high
frequency region are obtained. It is also possible to secure the characteristics.
[0126]
The present technology can be configured as follows.
[0127]
(1) A yoke formed of a magnetic material, a magnet attached to the yoke, a coil to which a drive
current is supplied, and an armature provided with a vibrating portion that vibrates when the
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drive current is supplied to the coil A drive frame having a holding frame having an opening, a
film attached to the holding frame in a state of covering the opening, and a diaphragm held
inside the holding frame in a state of being attached to the film; And a diaphragm unit having a
transmission beam for transmitting the vibration of a part to the diaphragm, wherein an entire
periphery of the outer periphery of the diaphragm is separated from an entire periphery of an
inner periphery of the holding frame.
[0128]
(2) The acoustic conversion device according to (1), wherein the distance between the entire
periphery of the outer periphery of the diaphragm and the entire periphery of the inner
periphery of the holding frame is constant.
[0129]
(3) The acoustic conversion device according to (1) or (2), wherein an inner periphery of a corner
portion of the holding frame is formed in a curved shape.
[0130]
(4) The acoustic conversion device according to any one of (1) to (3), wherein the outer periphery
of the corner portion of the diaphragm is formed in a curved shape.
[0131]
(5) The acoustic conversion device according to any one of (1) to (4), wherein the transmission
beam is formed by being bent from the diaphragm.
[0132]
(6) The transmission beam includes a base continuous with the diaphragm and a connecting part
continuous with the base and connected to the vibrating part, wherein the width of the base is
larger than the width of the connecting part The acoustic converter according to any one of 1) to
5).
[0133]
(7) The acoustic conversion device according to (6), wherein the width of the base and the width
of the connecting portion are each made constant.
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[0134]
(8) The acoustic conversion device according to any one of (1) to (7), wherein a reinforcing rib is
formed on the diaphragm.
[0135]
(9) The acoustic conversion device according to any one of (1) to (8), in which a rib is formed on
the transmission beam.
[0136]
(10) A storage unit including a case body for storing the drive unit and the diaphragm unit, and a
cover body and having an audio output hole for outputting an audio generated when vibration is
transmitted to the diaphragm The acoustic conversion device according to any one of (1) to (9).
[0137]
(11) A first acoustic conversion device and a second acoustic conversion device, the first acoustic
conversion device and the second acoustic conversion device both have a magnet and a coil to
which a drive current is supplied, and the coil A drive unit having an armature provided with a
vibrating portion that vibrates when the drive current is supplied, a holding frame having an
opening, a film attached to the holding frame in a state covering the opening, and the film A
diaphragm unit having a diaphragm held inside the holding frame in a state of being attached to
the support frame and a transmission beam for transmitting the vibration of the vibration unit to
the diaphragm; The entire circumference of the outer periphery of the diaphragm is separated
from the entire periphery of the inner periphery of the holding frame, and the second acoustic
transducer is an audio device in which one end of the diaphragm is fixed to the inner periphery
of the holding frame Output device
[0138]
(12) In each of the first acoustic conversion device and the second acoustic conversion device,
the transmission beam is formed by being bent from the diaphragm, and the vibration of the
transmission beam in the first acoustic conversion device is formed. The acoustic conversion
device according to (11), wherein the width of the bent portion from the plate is larger than the
width of the bent portion from the diaphragm of the transmission beam in the second acoustic
conversion device.
[0139]
(13) The acoustic conversion device according to (11) or (12), wherein a thickness of the
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diaphragm in the first acoustic conversion device is larger than a thickness of the diaphragm in
the second acoustic conversion device.
[0140]
DESCRIPTION OF SYMBOLS 1 ... Sound conversion apparatus, 2 ... Drive unit, 3 ... diaphragm unit,
4 ... storage unit, 5 ... Yoke, 6 ... Magnet, 7 ... Coil, 9 ... Armature, 16 ... Vibration part, 18 ...
Holding frame, 18c ... Openings 19 film 20 diaphragms 20a reinforcing ribs 21 transmission
beams 21a bent portions 21b ribs 22 corner portions 22b inner circumference 23 23 corner
portions 23b Inner circumference, 24: corner part, 24a: outer circumference, 25: corner part,
25a: outer circumference, 26: base, 27: connection part, 29: case body, 30: cover body, 30a:
voice output hole, 1A: Sound conversion device, 3A ... diaphragm unit, 20A ... diaphragm, 21A ...
transmission beam, 100 ... sound output device
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