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DESCRIPTION JP2004320399

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DESCRIPTION JP2004320399
The present invention provides an acoustic device capable of preventing occurrence of howling
in the case of downsizing by integrating a microphone at the center of a speaker with a simple
configuration. SOLUTION: A second area B on the lower side of the sound generation plate 14
and a third area C in which a sound collection unit 20 is provided are provided in the second
support portion 3b on the center side to which the sound generation plate 14 is fixed. Since the
passage 3c to be connected is formed, a sound P1 generated on the upper surface of the sound
generation plate 14 and reaching the third region C through the first region A etc. is generated
on the lower surface of the sound generation plate 14 and the third sound It is possible to cancel
out with the sound P2 reaching the area C. Therefore, the occurrence of howling can be
prevented. [Selected figure] Figure 2
Acoustic device and communication device equipped with the device
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an
integrated acoustic apparatus in which a microphone is mounted at the center of a speaker, and
in particular, to an acoustic apparatus capable of preventing occurrence of howling and the
apparatus mounted. Call equipment. 2. Description of the Related Art When the microphone and
the speaker are stored in a state in which they are brought close to each other in one case, the
microphone collects the sound (vibration) emitted from the speaker and the sound is converted
into an electric signal to be converted to the speaker. (Howling) occurs, repeating the
phenomenon that the microphone collects the sound. For this reason, in a conventional
communication device such as a mobile phone, means for separating the microphone and the
speaker as much as possible and avoiding the howling by preventing the microphone from
picking up the sound emitted from the speaker. Is taken. Alternatively, measures have been taken
to provide dedicated electronic circuits and software inside a speech apparatus such as a mobile
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phone to prevent the howling. However, when the means for separating the distance between the
microphone and the speaker is used, there is a problem that it is difficult to miniaturize a
communication device such as a portable telephone. In particular, if the microphone and the
speaker can be integrated without occurrence of howling, the size of the communication device
such as a portable telephone can be dramatically reduced. However, in the case of a mobile
phone in which a microphone and a speaker are integrated, the microphone side is usually
separated from the mouth and provided near the ear. In order to detect voice at this position, it is
necessary to increase the sensitivity and gain of the microphone, but at this time, extra external
noise is easily picked up, and the problem of poor sound quality remains. Further, in the means
using a dedicated electronic circuit for preventing howling, there is a problem that it is difficult to
miniaturize and difficult to reduce the manufacturing cost because the number of parts is
increased. Furthermore, in the means using software, there is also a problem that the amount of
memory that can be used by the user is reduced because it is necessary to reserve dedicated
memory. The present invention is intended to solve the above-described conventional problems,
and it is an acoustic system in which the microphone is integrally disposed at the center of the
speaker to miniaturize the microphone and the occurrence of howling can be prevented with a
simple configuration. An object of the present invention is to provide an apparatus and a
communication apparatus on which the apparatus is mounted.
Another object of the present invention is to provide an audio device and a communication
device on which the above-described device is mounted, which can prevent deterioration of
sound quality even when the microphone and the speaker are integrated. Patent Document 1:
Japanese Patent Application Laid-Open No. 8-317041 SUMMARY OF THE INVENTION In the
present invention, a sounding plate having an opening formed at its center is vibrated to direct
sound outward. Sound generation unit, a support unit for supporting the center side of the sound
generation plate, a support unit for supporting the outer periphery side, and a sound collection
plate provided at the center of the sound generation unit and vibrating based on an external
sound In an acoustic device provided with a sound collecting unit for taking in as a signal, a
passage for guiding a sound generated on the other surface of the sound generation plate to the
sound collecting unit on a support unit on the center side facing the sound collecting unit. The
sound guided by the passage and the sound generated on one surface of the sound generation
plate and directly guided to the sound collecting portion are between the sound collecting
portion and the support on the center side. It is characterized in that they are offset by each
other. More specifically, a portion for guiding a sound generated on one surface of the sound
generation board to the sound collection unit is surrounded by the first region, the other surface
of the sound generation board, and the two support portions. When the part is a second area and
the part where the sound collecting portion is provided is a third area, the passage guides the
sound generated in the second area to the third area, The sound generated in the first area and
the sound generated in the second area are offset in the third area. According to the present
invention, even if the sound producing unit and the sound collecting unit are simultaneously
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operable, sounds emitted from the upper and lower surfaces of the sound producing plate of the
sound producing unit cancel each other before reaching the sound collecting unit. Therefore, the
sound collecting plate of the sound collecting unit is not vibrated or the sound collecting plate is
not greatly vibrated. As a result, a comfortable simultaneous call can be made without generating
howling between the sound collection unit and the sound generation unit. In the above, it is
preferable that the passage is provided in a polar pattern range that indicates the directivity of
the sound collection unit. According to the above means, since it is possible to prevent the mixing
of unnecessary external noise, the sound collecting unit can acquire good quality voice. The
passage may be formed continuously in the circumferential direction or intermittently at a
predetermined pitch angle (pitch width) on the cylindrical support portion on the center side. In
the above configuration, the directivity of the sound collection unit is uni-directional, and also
emitted from the upper surface and the lower surface of the sounding board, even if the
directivity is omnidirectional or omnidirectional (all-directional). Can offset each other's sounds.
[0020] Further, according to the present invention, in the communication device on which the
sound device according to any one of the above is mounted, the sound collecting unit has single
directivity, and the sound generating plate of the sound generating unit is on the ear of the user.
When it is turned on, the direction of the sound collecting plate of the sound collecting unit is set
so that the user's mouth side is located within the range of polar pattern showing the
unidirectionality. It is a feature. With the means as described above, for example, when
incorporated in a mobile phone etc., it becomes possible to reliably collect the sound emitted
from the user's mouth in the sound collecting unit provided near the ear . FIG. 1 is a plan view of
the acoustic device of the present invention as viewed from the front, and FIG. 2 is a sectional
view taken along the line 2-2 of FIG. The grille cover 30 provided in FIG. 2 is omitted in FIG. The
acoustic device 1 shown in FIGS. 1 and 2 is assumed to be mounted on a mobile phone, and has a
frame 3 formed of metal or synthetic resin. A cylindrical first support 3a is formed on the
outermost periphery of the frame, and a cylindrical second support 3b is also formed at a
position closer to the center than the first support 3a. ing. As shown in FIG. 2, a lower yoke 11 is
provided between the second support 3 b and the second support 3 b. The lower yoke 11 has an
L-shaped cross section and a center hole is formed at the center thereof, and the second support
portion 3b is inserted in the center hole and positioned. A magnet 12 formed in an annular shape
is provided on the outer periphery of the second support portion 3 b and on the upper portion of
the lower yoke 11. Further, an upper yoke 13 similarly formed in an annular shape is provided
on the upper part of the magnet 12. The lower yoke 11 and the upper yoke 13 are formed of a
magnetic material such as iron or ferrite, and the magnet 12 provided between them is
magnetized, for example, with the N pole at the upper side and the S pole at the lower side. . The
gap between the lower yoke 11 and the upper yoke 13 is a gap G, and the magnetic field
generated from the N pole of the magnet 12 is a magnetic field of upper yoke → gap G → lower
yoke 11 → S pole of the magnet 12 It forms a road. That is, the lower yoke 11, the magnet 12,
the upper yoke 13 and the gap G constitute a magnetic field generating portion. On the end face
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of the first support portion 3a and the end face of the second support portion 3b, a sound
generation plate 14 having an opening 14a at its center is provided.
That is, the edge on the outer peripheral side of the sound generation plate 14 is fixed to the end
face of the first support portion 3a, and the edge on the center side is fixed to the end face of the
second support portion 3b. As a result, inside the frame 3, it is surrounded by the first region A
which is closer to the upper portion (Z1) than the sound generation plate 14, the first support
portion 3 a and the second support portion 3 b. A second area B which is closer to the lower
portion (Z2) than the sound generation plate 14 is formed. A space at the center of the frame 3
surrounded by the second support 3b is a third area C. The sounding plate 14 is made of, for
example, a laminate of a paper material and a resin film, or a paper material impregnated with a
resin. A cylindrical bobbin 15 extending toward the second area B is fixed to the lower surface of
the sounding plate 14, and a voice formed by winding a wire such as an enameled wire at the
lower end of the bobbin 15 A coil 16 is provided. The bobbin 15 and the voice coil 16 are
provided in the gap G between the lower yoke 11 and the upper yoke 13, and can freely move in
the gap G in the Z1-Z2 direction in the drawing. It is made possible. When an audio signal is
given to the wire material forming the voice coil 16, an electromagnetic force is generated in the
voice coil 16 by the current of the audio signal and the magnetic field passing through the gap G
in the magnetic field generation unit. Therefore, the bobbin 15 is vibrated in the Z1-Z2 direction
with the sound generation plate 14 in the figure. At this time, a sound corresponding to the audio
signal is emitted from the sound generation plate 14. That is, on the outer peripheral side of the
frame 3 (between the first support portion 3a and the second support portion 3b), a dynamic
type moving coil type magnetic drive means is provided. The magnetic drive means together with
the sound generation plate 14 constitute a sound generation unit 10. On the other hand, a sound
collecting unit 20 is provided in a third area C at the center of the frame 3. The sound collecting
unit 20 has a case 21, and inside thereof, a sound collecting plate 22 is provided which is
vibrated in the X1-X2 direction (vibration direction) in the figure when receiving a sound (sound
pressure) generated outside. . As a configuration of the sound collecting unit 20, for example, a
microphone adopting a dynamic moving coil method such as the sound emitting unit 10 may be
used, or a microphone of a well-known capacitor type electret method may be used. The sound
collecting unit 20 shown in this embodiment has directivity (unidirectionality) which is
perpendicular to the surface of the sound collecting plate 22 and is unidirectional (X1 direction
in FIG. 1). doing.
Then, in the acoustic device 1 shown in FIGS. 1 and 2, the sound collecting plate 22 is fixed to
the third area C of the frame 3 so that the sound collecting plate 22 is oriented perpendicularly
to the sound generating plate 14 of the sound generating unit 10. ing. Therefore, the sound
collection unit 20 has a polar pattern Pt which exhibits single directivity in the X1 direction,
which is indicated by an alternate long and short dash line in FIG. That is, the sound collecting
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unit 20 mainly collects the sound generated in the X1 direction indicated by the polar pattern Pt,
and the sounds generated in the other directions hardly collect any sound. As shown in FIGS. 1
and 2, the second support portion 3 b provided at the front (X1 direction) position in the
vibration direction opposite to the sound collecting plate 22 includes the second support 3 b in
the frame 3. A passage 3c connecting the second region B and the third region C is formed. The
passage 3c is formed by a hole penetrating the second support portion 3b, and continuously
along the second support portion 3b or at a predetermined pitch angle (pitch width). It is formed
intermittently. The overall length in the circumferential direction in which the passage 3c is
formed is preferably formed based on the directivity characteristic of the sound collecting unit
20, and the passage 3c shown in FIG. 1 is within the range of polar pattern Pt showing the single
directivity. It is provided. As shown in FIG. 2, at the top of the acoustic device, a grill cover 30 is
provided to cover the surface of the sound generating plate 14. An opening 31 is formed at the
center of the grille cover 30, and the upper end of the sound collecting unit 20 protrudes from
the opening 31 to the outside of the acoustic device 1. As shown in FIGS. 1 and 2, a plurality of
holes 32 are formed in the circumferential direction at positions of the grill cover 30 facing the
sound emitting portion 10. When an audio signal is given to the voice coil 16 in the sound
generation unit 10 and the sound generation plate 14 is vibrated, sounds are generated from
both the upper surface and the lower surface of the sound generation plate 14. Most of the
sound P1 generated from the upper surface of the sound generation plate 14 is emitted from the
first area A to the outside of the acoustic device 1 through the plurality of holes 32 formed in the
grill cover 30. A part reaches the sound collecting unit 20 in the third area C directly from the
first area A to the sound collecting unit 20 or around the outside of the grille cover 30 through
the central opening 31. Further, the sound P2 generated from the lower surface of the sound
generation plate 14 reaches the sound collection unit 20 in the third area C from the second area
B via the passage 3c. Here, the phase of the sound P1 generated from the upper surface of the
sound generation plate 14 and the sound P2 generated from the lower surface of the sound
generation plate 14 are different by 180 degrees.
Moreover, since the sound P1 and the sound P2 are the same amount of energy generated
simultaneously on the front and back of the sound generating plate 14, the sound P1 and the
sound P1 are located at a position in front of the sound collecting plate 22 as shown in FIG. The
sounds P2 offset each other. Therefore, the substantial sensitivity of the sound collection unit 20
to the sound emitted by the sound generation plate 14 can be reduced. Therefore, the sound
collection unit 20 can not pick up and vibrate the sound emitted by the sound generation unit
10, so that the generation of howling can be prevented. Therefore, in the audio device 1
according to the present embodiment, even if the sound producing unit 10 and the sound
collecting unit 20 can be operated simultaneously, the respective functions can be exhibited
individually without causing howling. FIG. 3 is a view showing a state of use in which the audio
device is mounted on the communication device. In the mobile phone (calling device) 40 shown
in FIG. 3, the acoustic device 1 is built in a case 40a. The acoustic device 1 is fixed on a
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predetermined circuit of a printed wiring board (not shown) provided in the case 40a. The
installation position of the sound device 1 in the mobile phone 40 is set so that the sound
generation plate 14 of the sound generation unit 10 faces the ear M1 of the user M. At this time,
the sound collection unit 20 is attached so that the center line Pt1-Pt1 of the polar pattern Pt of
the sound collection unit 20 shown in FIG. 1 faces the direction of the mouth M2 of the user M.
Therefore, when the sound generation plate 14 of the portable telephone 40 is made to face the
ear M1, the direction of the sound collection plate 22 is directed to the direction of the user's
mouth M2. Thus, the voice V emitted from the user's mouth M2 can be reliably collected, and the
sound emitted by the sound generation plate 14 is not picked up. Therefore, it is possible to
obtain a high quality sound with little howling and extraneous external noise. As described above,
in the mobile phone 40 according to the present embodiment, the internal circuit configuration is
simplified because it is not necessary to separately provide the sound emitting unit 10 serving as
a speaker (receiver) and the sound collecting unit 20 serving as a microphone. Be able to In
particular, since it is not necessary to use a dedicated electronic circuit for howling prevention,
the number of parts can be reduced and the manufacturing cost can be reduced. Further, it
becomes possible not only to integrate the microphone and the speaker, but also to prevent the
occurrence of howling with the simple configuration as described above even when the
microphone and the speaker are integrated. It becomes possible to miniaturize the size of 40.
Although the sound collecting unit 20 having a single directivity (polar pattern Pt) has been
described in the above embodiment, the present invention is not limited to this, and the sound
collecting unit 20 has two directivity. Also in the case of non-directionality, the same effect
(howling preventing effect etc.) is expected by forming the channel 3c formed in the second
support portion 3b within the range of the directivity. it can. In the case of the nondirectional
sound collecting unit 20, in particular, the passage 3c is intermittently formed at a
predetermined pitch angle over the entire circumference of the second supporting unit 3b to
prevent the generation of howling. can do. Further, in the above embodiment, the directivity of
the sound collection unit 20 is set by arranging the sound collection plate 22 of the sound
collection unit 20 to be vertically-placed (vertically oriented) with respect to the horizontal sound
generation plate 14. Although description has been made of one in which the direction of sex is
oriented in a predetermined direction, the present invention is not limited to this. That is, in the
case where the sound collection unit 20 exhibits predetermined directivity (for example, unidirectionality, bi-directionality or non-directionality) in a state where the sound collecting unit 20
is not horizontally disposed as in FIG. In addition, it may be provided in the third area C in a state
of being placed horizontally. In this case, it is possible to use, for example, a door phone. As
described above, according to the acoustic device of the present invention, even when the
microphone and the speaker are integrated, it is possible to provide the acoustic device in which
the occurrence of howling is prevented. In particular, since howling can be prevented with a
simple configuration without increasing the number of parts, the acoustic device can be
miniaturized, and the manufacturing cost can also be reduced. In addition, in the communication
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device in which the above-mentioned audio device is mounted, it becomes possible to prevent the
mixing of unnecessary noise, and the sound emitted from the user's mouth is assured in the
sound collection unit provided in the vicinity of the ear It is possible to collect sound into BRIEF
DESCRIPTION OF THE DRAWINGS FIG. 1 is a plan view of the acoustic device of the present
invention as viewed from the front, and FIG. 2 is a sectional view taken along line 2-2 of FIG. Fig.
3 is a view showing a usage state where the audio device is mounted on the communication
device; Description of symbols 1 audio device 3 frame 3a first support portion (support portion
on outer peripheral side) 3b second support portion (center side) Support part of 3c Passage 10
Sounding part 11 Lower yoke 12 Magnet 13 Upper yoke 14 Sounding board 14a Opening 15
Bobbin 16 Voice coil 20 Sound collecting part 22 Sound collecting board 40 Cell phone A First
area B Second area C Third area G gap
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