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JP2014068342

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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
financial decisions, should not be based on machine-translation output.
DESCRIPTION JP2014068342
Abstract: To provide a speaker for a hearing impaired person with high original sound
reproduction ability while amplifying sound pressure. In the speaker 10, an end of the bobbin 24
opposite to the wound side of the coil 48 is expanded radially outward of the bobbin 24, and a
flange portion 52 which is the expanded portion is It is bonded to the vibrating portion 21 by the
adhesive BND. For this reason, if the adhesive BND is thinly applied only to the portion
sandwiched between the flange portion 52 and the contact portion 21 in the vibrating portion
21, sufficient bonding strength can be secured. [Selected figure] Figure 2
Deaf person support speaker
[0001]
The present invention relates to a technology for improving hearing loss for hearing loss and
hearing aid wearers.
[0002]
FIG. 16A is a view showing an example of the structure of a conventional sealed speaker 70. As
shown in FIG.
In the speaker 70 of FIG. 16A, an annular magnet 73 and an annular plate 74 surrounding the
center pole 72 of the plate 71 are disposed on the back plate 71. The neck portion of the frame
75 is fixed to the front of the annular plate 74. A portion of the voice coil bobbin 76 around
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which the coil 77 is wound is accommodated in a magnetic gap GP1 which is a gap between the
inner peripheral surface of the annular plate 74 and the outer peripheral surface of the center
pole 72. The neck portion of the diaphragm 78 is joined to a portion slightly away from the tip of
the outer peripheral surface of the voice coil bobbin 76. Further, the peripheral edge of the cap
79 is bonded to the slightly outer side of the neck portion on the surface (sound emitting surface)
of the diaphragm 78. The diaphragm 78 and the voice coil bobbin 76 are covered by the inner
peripheral surface of the frame 75, and a damper 80 is bridged between the outer peripheral
surface of the bobbin 76 and the inner peripheral surface of the frame 75. The configuration of
this type of speaker is disclosed, for example, in Patent Document 1.
[0003]
JP 2003-116197 A
[0004]
As shown in the enlarged view of FIG. 16 (B), in the joint portion of the diaphragm 78 and the
bobbin 76 in this type of speaker, the tip of the neck portion of the diaphragm 78 is in line
contact with the outer peripheral surface of the bobbin 76 The joint portion between the cap 79
and the diaphragm 78 has a configuration in which the periphery of the cap 79 is in line contact
with the surface of the diaphragm 78.
However, in such a configuration, if a sufficient amount of adhesive BND is not applied to the
front and back sides of each line contact portion, that portion is easily peeled off. For this reason,
in the conventional speaker of this type, there is a problem that the usage fee of the adhesive,
which is a substance causing the sound turbidity, increases, and it is difficult to improve the
original sound reproducing capability.
[0005]
The present invention has been made in view of such problems, and it is an object of the present
invention to provide a speaker with high original sound reproduction capability.
[0006]
In order to solve the above problems, a speaker according to a preferred embodiment of the
present invention has an enclosure having an opening and a cavity communicating with the
opening, a vibrating portion supported on the inner periphery of the opening, and a magnetic
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gap. A magnetic circuit supported on the cavity side so as to direct the magnetic gap to the
vibrating portion, and a coil is wound around the outer peripheral surface of one end, and the
end of the coil wound is the magnetic And an end of the bobbin which is accommodated in the
gap and opposite to the end where the coil is wound is bonded to the vibrating portion, and an
end of the bobbin opposite to the end where the coil is wound. A portion extending radially
outward of the bobbin, and the expanded portion is bonded to the vibrating portion.
[0007]
In this speaker, the end of the bobbin opposite to the one on which the coil is wound is expanded
outward in the radial direction of the bobbin, and the expanded portion is bonded to the
diaphragm.
For this reason, sufficient bonding strength can be secured if the adhesive is thinly applied only
to the portion sandwiched between the portion of the vibrating portion and the radially outward
portion of the bobbin.
Therefore, according to the present invention, the usage of the adhesive can be suppressed more
than the speaker having a configuration in which the tip of the neck portion of the diaphragm is
in line contact with the outer peripheral surface of the bobbin. Therefore, according to the
present invention, it is possible to provide a speaker having an original sound reproducing
capability higher than that of a speaker in which the tip of the neck portion of the diaphragm is
in line contact with the outer peripheral surface of the bobbin.
[0008]
According to another preferred embodiment of the present invention, there is provided a hearing
aid speaker comprising: an enclosure having an opening and a cavity communicating with the
opening; a vibrating portion supported with a sound emitting surface facing the opening; and a
magnetic gap A magnetic circuit supported on the cavity side so as to direct the magnetic gap to
the vibrating portion, and a coil is wound around the outer peripheral surface of one end, and the
end of the coil wound is the magnetic A bobbin housed in a gap and a coupler having a shape in
which one end side of a cylinder is expanded outward, and the side of the bobbin opposite to the
side on which the coil is wound on the inner circumference of the coupler The end portion is
adhered, and the outside spread portion of the coupler includes the coupler adhered to the
vibrating portion, the inner wall surface of the enclosure is curved in an egg shape, and the
vibrating portion is Hollow honeycomb structure And a two-piece aluminum film sandwiching
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the honeycomb core from both sides.
[0009]
In the hearing aid speaker, the inner wall of the enclosure is curved in an egg shape.
When the inner wall surface of the enclosure is curved in an egg shape, standing waves are less
likely to be generated in the cavity. For this reason, it becomes difficult to happen that the
standing wave generated in the enclosure makes the sound muddy and the intelligibility is
lowered. Therefore, by installing and using the deaf person support speaker in the examination
room of the medical institution, it is possible to make the dialogue between the doctor and the
deaf person more smoothly.
[0010]
It is a front view of the speaker which is a 1st embodiment of the present invention. They are an
A-A 'line sectional view of Drawing 1, and a figure which expanded a part of this sectional view. It
is the side view and perspective view of the bobbin in the speaker of FIG. It is a front view and a
side view of a deaf person support speaker which is a 2nd embodiment of the present invention.
It is a figure which shows the method of utilization of the deaf person support speaker of FIG. It
is the C-C 'line sectional view of Drawing 4 (A). They are a front view, a bottom view, a sectional
view, and a back view of a speaker unit in the deaf person supporting speaker of FIG. It is a figure
which shows the content of verification of the effect of 2nd Embodiment of this invention. It is a
figure which shows the content of verification of the effect of 2nd Embodiment of this invention.
It is a figure which shows the result of verification of 2nd Embodiment of this invention. It is a
figure which shows the result of verification of 2nd Embodiment of this invention. It is a figure
which shows the result of verification of 2nd Embodiment of this invention. It is a figure which
shows the content of verification of the effect of 2nd Embodiment of this invention. It is a figure
which shows the result of verification of 2nd Embodiment of this invention. It is a figure which
shows the result of verification of 2nd Embodiment of this invention. It is sectional drawing of
the conventional speaker, and the figure which expanded a part of this sectional view.
[0011]
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Hereinafter, embodiments of the present invention will be described with reference to the
drawings. First Embodiment FIG. 1 is a front view of a speaker 10 according to a first
embodiment of the present invention. FIG. 2A is a cross-sectional view taken along line A-A 'of
FIG. The enclosure 11 of the speaker 10 has an opening 12 and a cavity 13 in communication
with the opening 12. The enclosure 11 has a substantially egg shape. The thickness of the shell
wall surrounding the cavity 13 in the enclosure 11 is uniform. The inner wall surface 14 of the
enclosure 11 is curved such that the cavity 13 has a substantially oval shape. Legs 16 are fixed
to the outer wall surface 15 of the enclosure 11. The opening 12 of the enclosure 11 has a true
circular shape. The speaker unit 20 is fitted in the opening 12.
[0012]
The speaker unit 20 is a device that emits a given electrical signal as a sound wave which is a
compression wave of air. The speaker unit 20 includes a vibrating portion 21, a frame 22 which
covers the vibrating portion 21 from the side of the cavity 13, a magnetic circuit 23 provided at
an end of the frame 22 opposite to the vibrating portion 21, and vibration in the frame 22. The
bobbin 24 is interposed between the portion 21 and the magnetic circuit 23.
[0013]
The vibrating portion 21 has a honeycomb core 25 having a hollow honeycomb structure, and
two aluminum films 26 and 27 covering the honeycomb core 25 from both sides. The films 26
and 27 of the vibrating portion 21 have a perfect circular shape having a diameter slightly
smaller than that of the opening 12. The outer periphery of the film 26 of the vibrating portion
21 is supported by the inner periphery of the opening 12 via the edge portion 49.
[0014]
The frame 22 has a substantially conical shape. There are perfectly circular openings on one side
and the other side of the frame 22 in the axial direction. The frame 22 is fixed to a portion of the
inner periphery of the opening 12 of the enclosure 11 with the larger diameter of the two
openings directed to the vibrating portion 21.
[0015]
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The magnetic circuit 23 is a member in which the yoke 28, the permanent magnet 29, and the
plate 30 are integrated. The magnetic circuit 23 is supported on the cavity 13 side of the
magnetic portion GP so as to direct the magnetic gap GP2 to the vibrating portion 21. More
specifically, the yoke 28 of the magnetic circuit 23 has a center pole portion 32 sharing a central
axis with the disc portion 31 and the portion 31. The cross section (cross section shown in FIG.
2A) obtained by cutting the surface passing through the central axes of the disk portion 31 and
the center pole portion 32 in the yoke 28 has a convex shape.
[0016]
The permanent magnet 29 has an annular shape. The permanent magnet 29 has an N pole on
one of the end faces (for example, the end face 42) of the end faces 42 and 43 facing in the
thickness direction, and an S pole on the other end face (for example, the end face 43). The inner
circumferential diameter of the hole in the permanent magnet 29 is larger than the outer
circumferential diameter of the center pole portion 32. The end face 42 of the permanent magnet
29 is fixed to the end face 41 of the disc portion 31 on the side where the center pole portion 32
is located. The center pole portion 32 projects toward the end face 43 of the permanent magnet
29 through the approximate center of the hole in the permanent magnet 29.
[0017]
The plate 30 has an annular shape thinner than the permanent magnet 29. The inner
circumferential diameter of the hole in the plate 30 is larger than the outer circumferential
diameter of the center pole portion 32 and smaller than the inner circumferential diameter of the
hole in the permanent magnet 29. One end face 44 of the plate 30 is fixed to the end face 43 of
the permanent magnet 29. The other end 45 of the plate 30 is fixed to the end 46 surrounding
the smaller diameter opening in the frame 22. The inner peripheral surface of the hole in the
plate 30 surrounds the outer peripheral surface of the portion of the center pole portion 32
which protrudes from the permanent magnet 29. The gap between the inner peripheral surface
of the plate 30 and the outer peripheral surface of the center pole portion 32 forms a magnetic
gap GP2.
[0018]
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The bobbin 24 winds the coil 48 around the outer peripheral surface of one end of the
cylindrical tubular portion 51 (FIG. 2B), and the end opposite to the side where the coil 48 is
wound is a flange portion 52. As shown in FIG. 2 (B), it is expanded outward in the radial
direction of the bobbin 24. A damper 47 is bridged between the outer peripheral surface of the
cylindrical portion 51 of the bobbin 24 and the inner peripheral surface of the frame 22. FIG. 3
(A) is an enlarged view of the bobbin 24 of FIG. 2 (A). FIG. 3 (B) is a perspective view of FIG. 3 (A).
As shown in FIGS. 3A and 3B, the flange portion 52 of the bobbin 24 has an annular shape. The
dimension in the radial direction of the flange portion 52 (the dimension in the width direction
from the center of the flange portion 52 toward the outer peripheral surface of the flange portion
52) is smaller than the diameter of the cylindrical portion 51. Further, the end faces 61 and 62
opposite to each other in the thickness direction of the flange portion 52 are orthogonal to the
extending direction of the cylindrical portion 51.
[0019]
As shown in FIG. 2A, the end of the bobbin 24 on which the coil 48 is wound is accommodated in
the magnetic gap GP2 of the magnetic circuit 23. Further, as shown in the enlarged view of FIG. 2
(B), the end face 62 of the flange portion 52 which is the end opposite to the wound side of the
coil 48 in the bobbin 24 is a vibrating portion by the soft adhesive BND. It is adhered to a film 27
of 21. The end face 62 of the flange portion 52 of the bobbin 24 and the film 27 of the vibrating
portion 21 face each other in parallel. A soft adhesive BND is applied with a substantially uniform
thickness between the end face 62 of the flange 52 and the film 27 of the vibrating part 21.
[0020]
In the magnetic circuit 23, magnetic lines of force generated by the permanent magnet 29 make
a circuit around the yoke 28 and the plate 30, and the magnetic lines of force cross the magnetic
gap GP2. For this reason, when a current of a sound signal is supplied to the coil 48 of the
bobbin 24, a driving force is applied to the bobbin 24 in a direction orthogonal to the extending
direction of the coil 48, and a vibrating portion in which the bobbin 24 and its end are bonded
21 vibrates. A compressional wave of air generated by the vibration of the vibrating portion 21 is
radiated forward as a sound wave.
[0021]
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The above is the details of the configuration of the present embodiment. According to the present
embodiment, the following effects can be obtained. First, in the present embodiment, the end of
the bobbin 24 opposite to the wound side of the coil 48 extends outward in the radial direction
of the bobbin 24, and the flange portion 52 which is the expanded portion. Are bonded to the
vibrating portion 21. For this reason, if the adhesive BND is thinly applied only to the portion
sandwiched between the vibrating portion 21 and the flange portion 52 of the bobbin 24,
sufficient bonding strength can be secured. Therefore, according to the present embodiment, the
usage fee of the adhesive can be suppressed more than a speaker having a configuration in
which the tip end of the neck portion of the vibrating portion is in line contact with the outer
peripheral surface of the bobbin. Therefore, according to the present embodiment, it is possible
to provide a speaker having an original sound reproducing capability higher than that of a
speaker in which the tip of the neck portion of the vibration unit is in line contact with the outer
peripheral surface of the bobbin.
[0022]
Second, in the present embodiment, the vibrating portion 21 is composed of a honeycomb core
25 having a hollow honeycomb structure, and two aluminum films 26 and 27 sandwiching the
honeycomb core 25 from both sides. For this reason, the high sound reproduction capability can
be made higher than a speaker having a vibration unit having another configuration.
[0023]
Thirdly, in the present embodiment, a portion of the end of the bobbin 24 that extends outward
in the radial direction of the bobbin 24 forms an annular flange portion 52, and the flange
portion 52 and the film 27 face each other in parallel. doing. Therefore, the thickness of the
adhesive BND applied between the flange 52 and the film 27 can be easily made uniform.
Therefore, according to the present embodiment, the unevenness of the adhesive BND in the joint
portion between the bobbin 24 and the vibrating portion 21 is reduced, and the bobbin 24
becomes more difficult to peel off.
[0024]
Fourth, in the present embodiment, the inner wall surface 14 of the enclosure 11 is curved such
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that the cavity 13 has a substantially oval shape. Therefore, according to the present
embodiment, the sound wave emitted from the vibrating portion 21 to the cavity 13 does not
reciprocate in the inner wall surface 14. Therefore, according to the present embodiment, the
generation of the standing wave in the cavity 13 can be suppressed.
[0025]
Second Embodiment Next, a hearing aid speaker 10A according to a second embodiment of the
present invention will be described. FIG. 4A is a front view of the hearing aid speaker 10A. FIG. 4
(B) is a side view of the hearing aid speaker 10A. The hearing aid support speaker 10A supports
the dialogue between the doctor and the deaf in the examination room of the medical institution.
FIG. 5 is a diagram showing how to use the hearing aid speaker 10A. As shown in FIG. 5, the
hearing aid speaker 10 </ b> A is attached to the leg 201 and placed on a platform 202 in front
of the sitting position of the hearing impaired person in the examination room. The hearing aid
support speaker 10A is connected to the microphone 203 near the sitting position of the doctor
via a cable (not shown). The microphone 203 picks up the voice uttered by the doctor and
outputs a sound signal, and the deaf person support speaker 10A emits the sound signal to the
deaf person.
[0026]
6 is a cross-sectional view taken along the line C-C 'of FIG. As shown in FIGS. 4 (A), 4 (B) and 6,
the hearing aid speaker 10A has an enclosure 111 and a speaker unit 120 housed therein. The
enclosure 111 is formed by joining two rods 211 and 212 in a hollow oval shape as a whole. The
diameter of the outer peripheral surface of the housings 211 and 212 forming the enclosure 111
has a maximum width φ1 (φ1 = 108.01 mm) at the joint portion Z of the both. The diameter of
the outer peripheral surface of the housing 211 is gradually reduced as it goes away from the
joint Z. The diameter of the outer peripheral surface of the casing 211 has a minimum width φ2
(φ2 = 20.00 mm) at a position separated by a distance W2 (W2 = 103.12 mm) rearward from
the joint portion Z. The inner wall surface 114 facing the cavity 113 in the rod body 211 has an
egg shape (more specifically, a shape obtained by dividing an egg into halves).
[0027]
A hole 204 is bored in the housing 211 between the rear end surface and the internal cavity 113.
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The holes 204 are for inserting a cable into the enclosure 111. The outer shell of the casing 211
has a recessed portion 205 recessed toward the cavity 113 side. Enclosure 111 has a hole 206
extending from recess 205 through housing 211 to housing 212. The recess 205 and the hole
206 are for mounting the leg 201 (FIG. 5).
[0028]
The diameter of the outer peripheral surface of the housing 212 gradually decreases with
distance from the joint Z toward the front. The diameter of the outer peripheral surface of the
housing 212 has a minimum width φ3 (φ3 = 77.09 mm) at a position spaced forward by a
width W3 (W3 = 44.90 mm) from the joint portion Z. In the casing 212, a hole 207 which
extends in a straight tubular shape toward the cavity 113 with the front end of the casing 212 as
the opening 112 is bored. The hole 207 has dimensions of diameter φ4 (φ4 = 61.89 mm) and
depth width W4 (W4 = 30.00 mm).
[0029]
The speaker unit 120 is fixed to the edge of the hole 207 opposite to the opening 112 with the
vibrating portion 121 directed to the opening 112. FIG. 7A is a front view of the speaker unit
120. FIG. FIG. 7B is a view (bottom view) of FIG. 7A as viewed in the direction of arrow B. FIG. 7C
is a cross-sectional view taken along the line C-C ′ of FIG. FIG. 7 (D) is a rear view of FIG. 7 (A).
As shown in FIGS. 7A, 7B, 7C, and 7D, the vibrating portion 121 is embedded in the front surface
of the frame 122 of the speaker unit 120. The vibrating portion 121 is supported by the opening
of the front surface of the frame 122 via the edge 149.
[0030]
The vibrating portion 121 has a honeycomb core 125 and two sheets of aluminum films 126 and
127 covering the honeycomb core 125 from both sides. The two films 126 and 127 in the
vibrating portion 121 are attached to the honeycomb core 125 by an adhesive. As shown in the
enlarged frame of FIG. 7, the honeycomb core 125 of the vibrating portion 121 has a regular
hexagonal shape. The length of one side of this regular hexagon is 1 mm.
[0031]
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Behind the vibrating portion 121 in the frame 122, a magnetic circuit 123 is supported. The
magnetic circuit 123 integrates the pot yoke 128, the permanent magnet 129, and the pole piece
130. A magnetic gap GP3 (an annular gap between the pole piece 130 and the pot yoke 128) of
the magnetic circuit 123 is directed to the vibrating portion 121.
[0032]
The bobbin 124 and the coupler 199 are connected between the magnetic circuit 123 and the
vibrating portion 121 in the frame 122. Unlike the first embodiment, the bobbin 124 has a
tubular shape. The coupler 199 has such a shape that one end of a cylinder having a height
sufficiently smaller than that of the bobbin 124 is expanded radially outward. The diameter of
the inner peripheral surface of the coupler 199 is the same as the diameter of the outer
peripheral surface of the bobbin 124. A coil 148 is wound around one end of the bobbin 124.
The end of the bobbin 124 on which the coil 148 is wound is accommodated in the magnetic gap
GP3. The end of the bobbin 124 opposite to the side on which the coil 148 is wound is
accommodated in the coupler 199. The contact portion between the inner peripheral surface of
the coupler 199 and the outer peripheral surface of the bobbin 124 is bonded. The radially
outwardly extending portion of the coupler 199 is bonded to the vibrating portion 121. A
damper 147 is bridged between the outer peripheral surface of the bobbin 124 and the inner
peripheral surface of the frame 122.
[0033]
The frame 122 is provided with a plus electrode 207 and a minus electrode 208. The plus
electrode 207 and the minus electrode 208 are connected to one end and the other end of the
coil 148 wound around the bobbin 124, respectively. In addition, each wire in the cable drawn
into the cavity 113 from the hole 204 is connected to the plus electrode 207 and the minus
electrode 208.
[0034]
The above is the details of the configuration of the present embodiment. According to the present
embodiment, the following effects can be obtained. First, in the present embodiment, the inner
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wall surface of the enclosure 111 of the hearing aid speaker 10A is curved in an egg shape. As
described above, when the inner wall surface of the enclosure 111 is curved in an egg shape,
standing waves are less likely to be generated in the cavity 113. For this reason, in the present
embodiment, it is less likely that the standing wave generated in the enclosure 111 makes the
sound muddy and the clarity is reduced. Therefore, according to the present embodiment, the
dialogue between the doctor and the deaf person can be performed more smoothly.
[0035]
Second, in the present embodiment, the end of the bobbin 124 opposite to the end on which the
coil 148 is wound is bonded to the inner peripheral surface of the coupler 199, and the portion
extending to the outside of the coupler 199 is a vibrating portion It is adhered to 121. As
described above, when the coupler 199 is interposed between the bobbin 124 and the vibrating
portion 121, since the bobbin 124 and the vibrating portion 121 do not need to be in line
contact with each other, the use of the adhesive which is a substance causing the sound turbidity
The amount is reduced. Therefore, according to the present embodiment, it is possible to further
improve the clarity of the sound to be heard by the deaf person.
[0036]
Thirdly, in the present embodiment, the vibrating portion 121 has a honeycomb core 125 having
a hollow honeycomb structure, and two aluminum films 126 and 127 sandwiching the
honeycomb core 125 from both sides. Here, in the cone-type speaker unit, the diaphragm (corn
paper) and the cap vibrate to generate a sound wave. On the other hand, in the speaker unit of
the hollow honeycomb structure, the film on the front side, the film on the back side, and the
honeycomb core vibrate to produce sound waves. Therefore, if the area of the radiation surface
of the sound seen from the front is the same, the area of the part contributing to the generation
of the sound wave is larger in the hollow honeycomb speaker unit than in the cone type speaker
unit, and the rear side The volume velocity of the sound also increases by the area equivalent of
the film and the honeycomb core. Therefore, according to the present embodiment, it is possible
to provide a compact and easy-to-carry deaf person supporting speaker that is capable of
emitting sound with a sound pressure level sufficient for the hearing impaired person to hear.
[0037]
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Fourth, in the present embodiment, the vibrating portion 121 is supported at a recessed position
inside the cavity 113 than the opening 112 in the hole 207 of the enclosure 111. The directivity
of the sound becomes stronger than that in the case where the vibrating portion 121 is installed
at the back of the opening 112 than that in the case where the vibrating portion 121 is installed
substantially flush with the opening 112. Distance attenuation is reduced. Therefore, in the
present embodiment, when the deaf person support speaker 10A is installed with the front facing
the deaf person, the deaf person can hear a sound with a high sound pressure level. Therefore,
according to the present embodiment, it is possible to provide a speaker for a hearing impaired
person with low power consumption while being able to emit a sound with a sound pressure level
sufficient for the hearing impaired person to listen.
[0038]
Fifth, in the present embodiment, the honeycomb core 125 of the vibrating body has a regular
hexagonal shape, and one side of the regular hexagon is 1 mm. Here, in the vibrator having a
hollow honeycomb structure, the volume velocity of sound is increased by the area equivalent of
the honeycomb core, so from the viewpoint of improvement of the sound pressure level, it is
possible to have hexagonal eyes of the honeycomb core. It is advantageous to make the area as
small as possible. However, since an adhesive is used to bond the honeycomb core and the film in
the vibrator, if the honeycomb core hexagonal eye is too fine, the adhesive is clogged in the space
between the two films in the honeycomb core. There is a risk of making the sound muddy. The
inventors of the present application changed the dimensions of the honeycomb core variously
and examined the intelligibility of the sound, and confirmed that the lower limit of the dimension
capable of securing the intelligibility of the sound is 1 mm. Therefore, according to the present
embodiment, it is possible to further enhance the ease of hearing the sound of the deaf person.
[0039]
Here, the inventors of the present invention consider that the ease of listening to the utterance
sound emitted from the microphone via the speaker depends on two factors, the sound pressure
(dB) of the sound at the listening point and the intelligibility of the sound. thinking. The inventors
of the present application conducted the following four verifications in order to confirm the
effect of the present embodiment under such a thought. In the first verification, the inventors
compare two speakers, a speaker having a honeycomb flat speaker unit mounted in an eggshaped enclosure and a speaker having a cone-shaped speaker unit mounted in a rectangular
enclosure, as comparison targets. did.
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[0040]
In addition, four deaf people are the subjects, and each speaker is a speaker of 57-S words
(numeric word table defined by the Japanese Aegology Association and a phonetic examination
term table consisting of 50 words of Japanese monosyllables) The sound was emitted at the same
sound pressure level, each subject was asked to answer the type of phoneme, and correctness
was recorded. In this test, in all four subjects, there were more types of sounds that were
successfully heard when using an egg-shaped speaker. In addition, all four subjects described the
impression that the egg-shaped speaker was easy to hear. According to the result of this test, the
hearing aid support speaker 10A of the present embodiment is a conventional general acoustic
speaker (one having a cone-shaped speaker unit mounted in a rectangular parallelepiped
enclosure) in terms of ease of listening to sound. It is corroborated to be superior.
[0041]
In the second verification, as shown in FIG. 8, the inventors of the present invention have a
speaker SP 21 in which a honeycomb flat speaker unit is substantially flush with the opening of
the front face of a rectangular parallelepiped enclosure, and an oval enclosure. Two speakers of
the speaker SP22 in which the honeycomb flat type speaker unit was attached substantially flush
to the opening on the front face were compared. The areas of the sound emitting surfaces of the
speaker units of the two speakers SP21 and SP22 were substantially the same, and the volumes
of the cavities in the enclosure were also substantially the same.
[0042]
Furthermore, the inventors set two positions of the microphone MIC at a point 1 meter away
from the center of the vibrating portion of each of the two loudspeakers SP21 and SP22 and a
point 5 meters away from the center of each vibrating portion (measurement The average sound
pressure level at the measurement point was measured when sine waves of 400 Hz and 800 Hz
were input to each of the speakers SP21 and SP22. The averaging time of the time-averaged
sound pressure level was 10 seconds. The measurement results are as shown in the following
table.
[0043]
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In this measurement result, the time average sound pressure level is higher in the speaker SP22
for both the point 1 meter apart and the point 5 meters apart. According to this measurement
result, it is supported that when the enclosure of the speaker is an oval, the sound pressure level
at each listening point in the front direction becomes high.
[0044]
In the third verification, as shown in FIG. 9, the inventors of the present application have installed
the speaker SP31 having the same structure as that of the hearing aid speaker 10A of the second
embodiment and the mounting position of the speaker unit 120 rather than this speaker SP31.
Two speakers SP32, which were 25 mm forward, were used as comparison targets.
[0045]
In addition, the inventors of the present invention have three points of points 1 meter away, 4
meters away, and 5 meters away in the front direction from the center of the vibrating portion of
each of the two speakers SP 31 and SP 32. The sound pressure level when a sine wave of each
frequency between 20 Hz and 20000 Hz was input to the input terminals of the speakers SP31
and SP32 was measured as the installation position (measurement point) of the microphone MIC.
[0046]
FIG. 10A is a graph LPS (SP31) of the measurement value of the sound pressure level of the
sound of the speaker SP31 when the distance between the speaker SP31 and the microphone
MIC is 1 meter.
FIG. 10B is a graph LPS (SP32) of the measurement value of the sound pressure level of the
sound of the speaker SP32 when the distance between the speaker SP32 and the microphone
MIC is 1 meter.
FIG. 10C is a graph in which the two graphs LPS (SP31) and LPS (SP32) in FIGS. 10A and 10B are
superimposed on the same frequency axis.
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[0047]
FIG. 11A is a graph LPS (SP31) of measurement values of sound pressure levels of the sound of
the speaker SP31 when the distance between the speaker SP31 and the microphone MIC is 4
meters. FIG. 11B is a graph LPS (SP32) of measurement values of sound pressure levels of the
sound of the speaker SP32 when the distance between the speaker SP32 and the microphone
MIC is 4 meters. FIG. 11C is a graph in which the two graphs LPS (SP31) and LPS (SP32) of FIGS.
11A and 11B are superimposed on the same frequency axis.
[0048]
FIG. 12A is a graph LPS (SP31) of measurement values of sound pressure levels of sound of the
speaker SP31 when the distance between the speaker SP31 and the microphone MIC is 5 meters.
FIG. 12B is a graph LPS (SP32) of measurement values of sound pressure levels of the sound of
the speaker SP32 when the distance between the speaker SP32 and the microphone MIC is 5
meters. FIG. 12C is a graph in which the two graphs LPS (SP31) and LPS (SP32) of FIGS. 12A and
12B are superimposed on the same frequency axis.
[0049]
In this measurement result, the sound pressure level of 1 kHz to 2 kHz is considered to be easily
affected by the deafness of the deaf person at any of the three measurement points of 1 m, 4 m
and 5 m. It is higher. According to this measurement result, it is supported that the sound
pressure level of the band that contributes to the ease of hearing the sound in the front direction
becomes high when the speaker unit is provided behind the opening of the enclosure.
[0050]
In the fourth verification, as shown in FIG. 13, the inventors of the present invention have the
same two speakers SP 31 (speakers having the same structure as the hearing aid speaker 10 A)
and SP 32 (speaker unit positions) as in the third verification. The speaker was moved by 25 mm
in advance to be compared.
[0051]
11-05-2019
16
Furthermore, the inventors set two positions of the microphone MIC at two points that are 1
meter away and 4 meters away from the center of the vibrating portion of each of the two
speakers SP31 and SP32. Measurement point).
Then, white noise is input to the input terminals of the speakers SP31 and SP32, FFT (Fast
Fourier Transform) is applied to the sound signal of the sound collected by the microphones MIC
at each measurement point, and the sound of the center frequency of 1/3 octave band The
pressure level was determined.
[0052]
FIG. 14A is a graph LPN (SP31) of measurement values of sound pressure levels of sound of the
speaker SP31 when the distance between the speaker SP31 and the microphone MIC is 1 meter.
FIG. 14B is a graph LPN (SP32) of measurement values of sound pressure levels of sound of the
speaker SP32 when the distance between the speaker SP32 and the microphone MIC is 1 meter.
FIG. 14 (C) is a graph in which the two graphs LPN (SP31) and LPN (SP32) of FIGS. 14 (A) and 14
(B) are superimposed on the same frequency axis.
[0053]
FIG. 15A is a graph LPN (SP31) of measurement values of sound pressure levels of sound of the
speaker SP31 when the distance between the speaker SP31 and the microphone MIC is 4 meters.
FIG. 15B is a graph LPN (SP32) of measurement values of sound pressure levels of sounds of the
speaker SP32 when the distance between the speaker SP32 and the microphone MIC is 4 meters.
FIG. 15C is a graph in which the two graphs LPN (SP31) and LPN (SP32) of FIGS. 15A and 15B
are superimposed on the same frequency axis.
[0054]
In this measurement result, the sound pressure level of 1 kHz to 2 kHz is considered to be higher
in the speaker SP31, which is considered to easily affect the hearing ability of the deaf person at
any of the two measurement points of 1 m and 4 m. It has become. This measurement result also
supports that the sound pressure level of the band that contributes to the ease of hearing the
11-05-2019
17
sound in the front direction is high when the speaker unit is provided behind the opening of the
enclosure.
[0055]
As mentioned above, although 1st and 2nd embodiment of the present invention was described,
the following modification may be added to this embodiment. (1) In the first embodiment, the
enclosure 11 has a substantially egg shape. However, the enclosure 11 may be rectangular.
[0056]
(2) In the first embodiment, the vibrating portion 21 is composed of the honeycomb core 25 and
the films 26 and 27. However, this vibrating portion 21 may be replaced with one composed of
cone paper and a cap. In this case, the direction of diffusion of the flange portion 52 which is the
end of the bobbin 24 (the end opposite to the direction in which the coil 48 is wound) may be the
same as the angle of the tapered surface forming the outer periphery of the cone paper. .
[0057]
DESCRIPTION OF SYMBOLS 10, 70 ... Speaker 11, 11, 111 ... Enclosure, 12, 112 ... Opening, 13,
113 ... Cavity, 14 ... Inner wall surface, 15 ... Outer wall surface, 16, 201 ... Leg, 21, 121 ...
Vibrating part, 22, 122 ... frame, 23123 ... magnetic circuit, 24, 76, 124 ... bobbin, 25, 125 ...
honeycomb core, 26, 27, 126, 127 ... film, 28 ... yoke portion, 29, 129 ... permanent magnet, 30 ...
plate, 31 ... disk portion 32, 32, center pole portion 48, 148, 49 49 edge portion 51, cylinder
portion 52, flange portion 71, back plate 78, diaphragm plate 79, cap.
11-05-2019
18
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