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JP2004200836

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DESCRIPTION JP2004200836
An acoustic apparatus comprising a speaker capable of being attached to a small space and
capable of listening to voice even when the user is away from the user, and a microphone
capable of acquiring voice even if the voice is small. provide. SOLUTION: A voice emitted from a
user 50 is reflected by a concave surface 11 of a reflecting plate 10 in a portable telephone 100
and is acquired by a microphone of a sound collecting unit 41 of an acoustic device 1. Further,
the sound emitted from the speaker is outputted to the sound generation unit 21 toward the user
reflected by the concave surface 11. Since directivity is narrow in time of sound collection, it is
possible to obtain a low voice in a clear state. In addition, since the directivity at the time of
pronunciation becomes wide, the user can hear the voice. [Selected figure] Figure 3
Sound equipment
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an
acoustic device mounted on a small portable terminal such as a portable telephone, and more
particularly to an acoustic device provided with a speaker and a microphone. 2. Description of
the Related Art In recent years, portable terminals such as portable telephones and PHS capable
of transmitting and receiving still images and moving pictures as well as voices have become
widespread. In such a portable terminal, for example, an image on the other side of the
communication is displayed on a monitor provided substantially in front of the portable
telephone. Further, the image on the user side is transmitted via a camera provided in the vicinity
of the monitor. Furthermore, a speaker for generating the voice of the other party, a microphone
for collecting the voice of the user, and the like are provided around the monitor, and the user
communicates while watching the image of the other party displayed on the monitor. It is
possible to enjoy conversation with the other party. Patent Document 1: JP-A-2002-58094
SUMMARY OF THE INVENTION A state in which various operation buttons, the camera, etc. are
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concentrated on the front of a portable telephone provided with the monitor. It is common to be
placed at Therefore, if the space occupied by the speaker and the microphone can be reduced, it
is possible to install a monitor of a large size. However, if the size of the microphone is too small,
the sensitivity is likely to be reduced, and if the size of the speaker is small, it is difficult to listen
to conversations. When talking while viewing a screen projected on a monitor, it is general to
move the mobile phone forward from the user's body to make the monitor easy to see. However,
at this time, the distances between the user's ear and the speaker and between the user's mouth
and the microphone are also separated at the same time, so that the user can not clearly hear the
sound emitted from the speaker. Or the microphone can not normally acquire the voice emitted
from the user. On the other hand, such a problem may be considered to be achieved by using an
auxiliary device such as an earphone with a microphone, but when such an auxiliary device is
provided as an accessory, the number of parts increases and the cost becomes high. . Further,
using an auxiliary device as an optional device sold separately imposes an excessive burden on
the user side, which is not preferable.
The present invention is intended to solve the above-mentioned conventional problems, and can
be mounted in a relatively small space, and clear voice can be obtained even when the distance
between the user and the portable terminal is increased. It is an object of the present invention to
provide an audio device including a speaker capable of emitting sound and a microphone capable
of acquiring normal sound. SUMMARY OF THE INVENTION The present invention is an acoustic
device having a sound producing portion and a reflector, wherein an imaginary center line
perpendicular to a certain imaginary plane is taken as an axis. The reflector has a concave
surface formed symmetrically with respect to the axis, and the sound producing portion is
provided on the axis, and the sound generation direction is directed to the concave surface. It is
said that. In the present invention, the sound output from the speaker is emitted toward the back
of the device, which is the opposite side to the user side. Then, the sound is reflected at the
concave surface of the reflector provided on the rear side of the device, and is finally directed to
the user side. The directivity of sound can be broadened by increasing the curvature of the
concave surface, and the directivity can be narrowed by decreasing the curvature. Then, when
the concave surface is set to the optimum curvature, the user can hear the voice in a clear state
since the voice of the optimum state can be given to the user's ears on both sides. In order to give
such sound, it is preferable that the concave surface of the reflector is the paraboloid. It is
preferable that a sound collecting unit be provided on the axis of the virtual center line and at a
position where the concave surface is in focus. In the above configuration, the sound emitted by
the user can be concentrated on the focal point of the reflector and can be acquired by the
microphone provided on the focal point. Therefore, even a small microphone with low sensitivity
can obtain clear sound. In this case, it is preferable that the sound generation area of the sound
generation unit is larger than the sound collection area of the sound collection unit. Furthermore,
it is preferable that the sound producing unit and the sound collecting unit be integrally
provided. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT FIG. 1 is a cross-sectional
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view of the main part of an acoustic device according to an embodiment of the present invention,
FIG. 2 is a perspective view showing a state in which the audio device is mounted on a portable
telephone, FIG. 3 is a cross-sectional view taken along the line III-III in FIG. 2 and showing a
relationship with a user. The audio device 1 of the present invention is mounted on a portable
terminal such as a portable telephone 100 (see FIG. 3).
As shown in FIG. 1, the acoustic device 1 is composed of a reflector 10 and an acoustic member
20 in which a speaker as a sound producing unit 21 and a microphone as a sound collecting unit
41 are integrally provided. . The reflector 10 is provided on the bottom surface 31 of the housing
30 of the mobile phone 100. Further, the acoustic member 20 is provided on the back surface of
the grill 32 provided on the surface of the housing 30 and at a position facing the reflector 10.
That is, the acoustic member 20 is installed in a state of being directed to the reflector 10. The
grill 32 is formed of a thin metal plate, and the grill 32 has a plurality of opening holes 32a. One
surface of the reflector 10 (the surface on the Y2 side facing the acoustic member 20) is formed
with a concave surface 11 that is concave in the Y1 direction. The concave surface 11 is formed
in axial symmetry with respect to an imaginary center line Y which intersects the bottom surface
31 perpendicularly. The concave surface 11 will be described in detail. First, as shown in FIG. 1, a
cross section of an arbitrary virtual plane parallel to the bottom surface 31 and perpendicularly
intersecting the imaginary center line Y (Y axis) in the reflector 10 is an imaginary horizontal line
X (X axis) as shown in FIG. A cross section formed by the virtual center line Y and the virtual
horizontal line X is taken as an XY cross section, and a point at which the virtual center line Y
intersects with the virtual horizontal line X is taken as an origin O. At this time, the contour of the
cross section of the concave surface 11 forms a part of the parabola 11 a consisting of Y = a · X
<2> + b · X + c (where a, b and c are arbitrary rational numbers or irrational numbers) The
concave surface 11 is formed of a paraboloid that is produced when the parabola 11a is rotated
about the virtual center line Y as an axis. The apex of the paraboloid that is the concave surface
11 is in contact with the virtual horizon X at the origin O. The sound member 20 is integrally
provided with a sound producing unit 21 functioning as a speaker and a sound collecting unit 41
functioning as a microphone, and the sound collecting unit 41 is installed at the center of the
sound producing unit 21. The sound generator 21 has a base 22. The base 22 is, for example, a
printed wiring board or the like, and the sound generation unit 21 is fixed on the printed wiring
board by soldering. A lower yoke 23 formed of a magnetic material such as iron or ferrite is fixed
to the base 22. The lower yoke 23 is formed in a ring shape, and an opposing yoke 24 extending
in a cylindrical shape in the Y1 direction is integrally formed with the lower yoke 23 on the
lower yoke 23 and at an edge on the inner peripheral side. .
A ring-shaped magnet M formed of a permanent magnet is fixed to the surface of the lower yoke
23 on the Y1 side. However, the magnet M is positioned on the lower yoke 23 so that a fixed gap
(gap G) is formed between the inner peripheral surface Ma of the magnet M and the outer
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peripheral surface 24 a of the opposing yoke 24. It is fixed to A ring-shaped upper yoke 26 made
of a magnetic material is fixed to the surface on the Y1 side of the magnet M. In the upper yoke
26, the height position of the upper surface on the Y1 side and the height position of the upper
surface on the Y1 side of the opposing yoke 24 are set substantially the same, and the inner
peripheral surface 26a of the upper yoke 26 opposes the upper surface. A predetermined gap G
is formed between the yoke 24 and the outer peripheral surface 24 a of the yoke 24. A support
26 b is formed on the outer peripheral edge of the upper yoke 26 so as to protrude toward the Y
1 side. Further, a cylindrical support 27 is fixed on the base 22 on the inner peripheral side
relative to the opposing yoke 24 and the height position of the upper surface of the support 27
on the Y1 side and the Y1 side of the support 26b. And the height position of the upper surface
of are set equal to one another. A thin film vibrating member 28 is provided between the support
26 b and the support 27. The vibrating member 28 is formed in a ring shape by a paper material,
a laminate material of a paper material and a resin film, a paper material impregnated with a
resin, or the like. The vibrating member 28 is fixed to the upper surfaces of the support 26 b and
the support 27 on the Y 1 side with an adhesive or the like at the outer peripheral edge thereof.
The inner diameter of the support 27 and the inner diameter of the hole formed at the center of
the vibrating member 28 are the same. Therefore, in the acoustic member 20 of the present
embodiment, a cylindrical recess space 22 a is formed at the center of the vibrating member 28
(inside of the support 27). A cylindrical bobbin 29 made of paper or the like is fixed to the lower
surface of the vibrating member 28 on the Y2 side, and a voice coil C is wound around the outer
peripheral surface thereof. The bobbin 29 having the voice coil C is disposed in the gap G.
Therefore, in the acoustic member 20 of the present embodiment, when the magnet Y on the Y1
side is magnetized as the N pole and the Y2 side as the S pole on the magnet M, the N pole on the
Y1 side of the magnet M, upper yoke A magnetic circuit (magnetic path) is formed, which is a
path that sequentially passes through the outer edge portion 26, the gap G, the voice coil C, the
opposing yoke 24, the lower yoke 23 and the S pole of the magnet M in order.
A protective plate 25 is provided on the surface on the Y 1 side of the vibrating member 28. A
circular through hole 25a is formed at the center of the protection plate 25, the inner peripheral
edge thereof is fixed to the support 27 and the outer peripheral edge is fixed to the support 26b.
Therefore, the recessed portion space 22 a is not blocked by the protective plate 25. As shown in
FIG. 1, between the support 26 b and the support 27, the protective plate 25 is raised to the Y 1
side in the figure, and between the protective plate 25 and the vibrating member 28. A minute
gap is formed. A plurality of round holes 25 b aligned at equal intervals in the circumferential
direction are formed in the protection plate 25 of the raised portion. The sound collection unit
41 is provided inside a recess space 22 a formed at the center of the sound generation unit 21,
and is fixed on a printed wiring board which is the base 22. Inside the sound collection unit 41, a
vibrating body 41a is provided perpendicular to the virtual center line Y (parallel to the virtual
horizontal line X). It is preferable that the center of the vibrating body 41 a be disposed so as to
coincide with the focal point F of the paraboloid which is the concave surface 11 of the reflector
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10. When the distance between the origin O and the focal point F is f, the coordinates of the focal
point F can be represented by (f, 0) on the plane of the XY section, but the focal point F is It is a
point that satisfies X <2> = 4 · f · Y. As the sound collection unit 41, for example, a dynamic
microphone utilizing generation of an electromotive force in a coil provided on a diaphragm
(diaphragm film) vibrating in a magnetic field, a diaphragm based on sound pressure, and an
electrode Use of a known microphone such as a condenser microphone that detects a change in
electrostatic capacitance as a change in voltage, a crystal microphone that uses an electromotive
force of a piezoelectric element deformed by sound pressure as an output, or a directional
microphone with excellent directivity Is possible. The operation of the above-described audio
device will be described. (When Functioning as a Speaker) In the sound generation unit 21, when
a current based on sound information flows in the voice coil C, the bobbin 29 moves in the Y1-Y2
direction. By this movement operation, the vibrating member 28 vibrates in the Y1-Y2 direction
and a sound is emitted. The sound is output in the direction of the bottom surface 31 (in the Y1
direction in the drawing) of the mobile phone 100 through a plurality of round holes 25b formed
in the protective plate 25. Since the reflector 10 is provided at the back of the protective plate 25
(in the Y1 direction), the sound is reflected by the concave surface 11 of the reflector 10 and
passes through the opening 32a of the grille 32 (in the Y2 direction). Is emitted to the outside of
the mobile phone 100.
As shown in FIG. 2, the acoustic device 1 is mounted near the monitor 110 of the mobile phone
100. A camera 120 is provided at the top of the monitor 110. As shown in FIG. 3, the sound
emitted from the sound generation unit 21 of the acoustic device 1 is reflected by the concave
surface 11 of the reflector 10 and emitted toward the front (direction Y2 in the figure) of the
mobile phone 100. At this time, the voice is output radially. Therefore, as shown in FIG. 3, the
voice output from the acoustic device 1 is used in a state where the user 50 is viewing with the
monitor 110 provided on the mobile phone 100 in front of him or the like. It is possible to give
to the ears 51, 51 on both sides of the person 50. Thus, the user 50 can clearly hear the voice
emitted by the communication partner. (When Functioning as a Microphone) On the other hand,
when talking while viewing an image projected on the monitor 110 provided in the mobile
telephone 100, the sound emitted from the user 50 is of the grill 32. It is provided inside the
mobile phone 100 through the opening 32a. At this time, the sound passes through the acoustic
member 20 and is reflected by the concave surface 11 of the reflector 10 provided in the rear
(direction Y1 in the drawing) to be directed to the sound collection unit 41. Therefore, the sound
collection unit 41 can efficiently acquire voice by the vibrating body 41 a provided at the focal
point F. At this time, the concave surface 11 is formed by a paraboloid, and the vibration body 41
a is clear because it has an excellent ability to collect most of the sound on the focal point F
(sound collecting power). Sound can be acquired. Therefore, even when the communication
partner speaks in a low voice, the voice can be easily acquired, and the sensitivity of the sound
collection unit 41 can be improved. Alternatively, in the case of using a microminiature
microphone with low sensitivity, even voices that could not be acquired can be easily acquired.
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By the way, the mouth that emits the voice is located at one place in the center of the face, while
the ears that listen to the voice are located on both sides of the face. Therefore, it is preferable
that the directivity of the sound given from the sound producing unit 21 to the ears on both sides
be wider than the directivity of the sound outputted from the mouth to the sound collecting unit
41. In the above embodiment, the sound collecting area of the sound collecting unit 41 (the area
of the vibrating body 41 a) of the sound generating area (the area of the vibrating member 28) of
the sound generating unit 21 on the speaker side is the microphone side. It is wider than).
Therefore, since a voice having wide directivity can be generated at the time of sound generation
as described above, the user 50 can easily hear the voice output from the sound generation unit
21. Further, at the time of sound collection, even with the narrow sound collection unit 41 as
described above, it is possible to acquire the sound emitted from the mouth of the user 50. Then,
when directivity is given to the sound generation unit 21 and the sound collection unit 41 in this
way, the sound collection unit 41 mainly acquires the voice emitted by the user even when used
in a noise area, for example. It will be. Also, the user can easily hear the sound output from the
sound generator 21 even in the noise area. In the above embodiment, since the sound collecting
unit 41 is provided at the center of the inside of the sound generating unit 21, the size of the
acoustic member 20 can be miniaturized. Further, in the audio device 1 of the present invention,
since the conversation can be performed even in the state where the mobile phone 100 is
separated from the user's ear or mouth, as in the prior art, a sound generator is provided on the
upper end side of the mobile phone There is no need to separately arrange the sound collecting
units at the lower end side. Then, as shown in FIG. 2, the integrated acoustic device 1 may be
disposed at one place in the mobile phone 100, so the mounting space of the audio device 1
occupied in the mobile phone 100 can be reduced. Therefore, the mobile phone 100 can be
miniaturized. In the above embodiment, although the case where the concave surface 11 of the
reflector 10 is a paraboloid has been described, the present invention is not limited to this and,
for example, it may be formed of a substantially elliptical surface. It may be Further, although the
above embodiment has been described using a mobile phone, the present invention can be used
for a transceiver, a door phone, etc. in addition to this. As described above, according to the
present invention, it is possible to mount in a relatively small space, and to hear voice clearly
even when the distance to the user is increased. It is possible to provide an acoustic device
provided with an intelligent speaker and a microphone that can acquire even small voices. BRIEF
DESCRIPTION OF THE DRAWINGS FIG. 1 is a cross-sectional view of a main part of an audio
device as an embodiment of the present invention, FIG. 2 is a perspective view showing a state in
which the audio device is mounted on a mobile phone, FIG. III-III line cross-sectional view of FIG.
2 showing the relationship with the user [Description of the code] 1 acoustic device 10 reflector
20 acoustic member 21 sound generation unit 41 sound collector 50 user 100 mobile phone
110 monitor X virtual horizontal line ( X axis) Y virtual center line (Y axis)
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