JP5057345B2 - Microphone device, mobile phone, and sound guide member in electronic device - Google Patents

Description

  The present invention relates to a microphone device, a mobile phone, and a sound guide member in an electronic device.

  2. Description of the Related Art Conventionally, a so-called double microphone structure microphone device using two microphone units is mounted on a mobile phone or an acoustic device.

  For example, in a video camera, two microphone units are arranged so that a vibration film faces upward and no gap is generated. Pipes are provided to connect the sound holes of the two microphone units to the space outside the unit case. Accordingly, the distance between the openings of the two pipes can be set to be larger than the distance between the two sound holes of the microphone unit, and the stereo microphone can be miniaturized (Patent Document 1).

  In addition, in a mobile phone, in order to clearly collect the user's speech, two microphone units are used to receive the sound from the front case side and the sound from the rear case side to reduce ambient noise. Canceling has been done.

  FIG. 16 is a front view of a case KTKj on the fixed side of the conventional mobile phone 1j, and FIG. 17 is a front view showing a microphone device MCj provided inside the case KTKj.

  16 and 17, the casing KTKj is configured by being coupled with screws in a state where the front case KKFj and the rear case KKRj are combined.

  The front case KKFj is provided with a first sound hole 81 for transmission on substantially the center in the width direction, that is, on the center line TS along the longitudinal direction of the casing KTKj. The rear case KKRj is also provided with a second sound hole 82 at a position substantially in the center in the width direction and slightly shifted downward from the first sound hole 81.

  In FIG. 17, two microphone units UM1j and UM2j are mounted on the printed circuit board KBj in accordance with the positions of the first sound hole 81 and the second sound hole 82. Since these two microphone units UM1j and UM2j receive the environmental sound in the opposite phase to each other, most of the environmental sound, that is, noise can be eliminated by adding these output signals.

JP-A-6-288494

  However, in the conventional microphone device MCj shown in FIGS. 16 and 17, since the two microphone units UM1j and UM2j are arranged in the vertical direction at the center in the width direction of the front case KKFj, the length dimension of the mobile phone 1j is small. As a result, the size became large, which was a major limitation in miniaturization.

  If the positions of the microphone units UM1j and UM2j are changed and the positions of the first sound hole 81 and the second sound hole 82 are changed accordingly, the noise cancellation effect may be reduced. In addition, there is a possibility that a directivity characteristic changes between a right-effect user and a left-effect user, causing a problem in terms of usability. In addition, in the cellular phone 1j that is increasingly mounted with higher functionality and more functions in recent years, how to arrange the two microphone units is an extremely important problem in mounting.

  The present invention has been made in view of the above-described problem, and an object of the present invention is to reduce the size of the apparatus without reducing the noise canceling effect.

  The microphone device according to the present embodiment includes a front case and a rear case that form at least a part of a housing, a first sound hole provided substantially at the center in the width direction of the front case, and the rear case. A second sound hole provided at a position substantially in the center in the width direction of the first sound hole and shifted in the longitudinal direction of the housing with respect to the first sound hole, and a sound received from the first sound hole. A first microphone unit disposed inside the housing in a direction toward the front case so as to make a sound, and a position shifted in the width direction with respect to the first microphone unit, in a direction toward the rear case. A second microphone unit disposed inside the housing; and a sound guide member having a sound path that guides the sound entering from the second sound hole so that the second microphone unit receives the sound.

  According to the present invention, it is possible to reduce the size of the apparatus without reducing the noise cancellation effect.

It is a front view which shows the external appearance of the mobile telephone which concerns on one Embodiment of this invention. It is the disassembled perspective view seen from the front case side of the receiver side of the mobile phone. It is the disassembled perspective view seen from the front case side of the transmitter side of the mobile phone. It is a rear view on the transmitter side of the mobile phone. FIG. 2 is a cross-sectional view taken along line AA in FIG. 1. It is a figure which expands and shows the principal part of FIG. It is the figure which looked at the right side in the longitudinal section of the center of FIG. It is the front view which looked at a part of printed circuit board by the side of a transmitter from the rear case side. It is the front view, left view, and bottom view of a sound guide member. It is the right view and right side sectional drawing of a sound guide member. It is a rear view of a sound guide member. It is a perspective view of a sound guide member. It is a figure which shows the arrangement | positioning relationship of a microphone apparatus. It is a figure which shows the example of the circuit of a microphone apparatus. It is a figure which shows the directivity of the horizontal direction of a microphone apparatus. It is a front view of the housing | casing of the stationary side of the conventional mobile telephone. It is a front view which shows the conventional microphone apparatus.

  1 to 4, the cellular phone 1 according to the present embodiment is a folding type in which a transmitter side (fixed side) SG and a receiver side (movable side) JG are rotatably connected by a hinge HJ. is there. The case KTS of the transmitter side SG includes a front case 11 having an operation unit SB provided on the front surface, and a rear case 12 disposed in contact with the back side of the front case 11. The front case 11 and the rear case 12 are each manufactured by molding (molding) of a synthetic resin such as polycarbonate or ABS resin. The front case 51 and the rear case 52 of the receiver side JG are similarly manufactured by resin molding.

  Various operation buttons 20 for inputting a telephone number and other information are arranged on the operation unit SB so as to protrude from a hole provided in the front case 11 to the front surface (front surface). By pressing, a contact, a sensor, or the like provided on the printed circuit board 31 described later is configured to detect it.

  In addition, a battery housing portion RD is provided inside the rear case 12, and the surface thereof is a detachable battery lid 24. The front case 11 and the rear case 12 are integrated by four screws 41, 41... Inserted from the side of the rear case 12 and screwed. After the screws 41, 41... Are tightened, the screw concealment members 42, 42, 43, 43 are inserted, and the surface is finished smoothly.

  As shown in FIG. 3, a numeric keypad BS1, a dome sheet BS2, a printed circuit board 31, a flexible cable BS3, a hinge flex BS4, a fixed frame BS5, a SIM tray BS6, A component BS8 such as a substrate BS7, a sound guide member 34, and an adhesive tape 35a, a component BS9, and the like are incorporated.

  Returning to FIG. 1, the housing KTJ of the receiver side JG includes a front case 51 and a rear case 52 arranged in contact with the back side of the front case 51. A main display 61 made of a color LCD is provided on the surface of the front case 51, and an earpiece pad 63 is provided above the main display 61 for transmitting the sound output from the inner receiving speaker.

  As shown in FIG. 2, there are a receiver sheet 64, a one-touch key BJ3, a one-touch flexible module BJ4, a one-touch tape BJ5, an LCD protective panel BJ6, and an LCD protection panel. Packing BJ7, speaker 65, camera 66, holder 67, main display 61, sub display BS9, printed circuit board 62 (BJ10), frame BJ11, sub LCD packing BJ12, sub LCD protective panel BJ13, rear panel tape BJ14, etc. It has been incorporated.

  The front case 51 and the rear case 52 are integrated by four screws 71, 71... Inserted from the front case 51 side and screwed.

  Various signals are transmitted and received by the flexible cable BS4 between the printed circuit board 31 on the transmitter side SG and the printed circuit board 62 on the receiver side JG. The flexible cable BS4 is arranged in a state of being bent through the internal space of the hinge HJ, and has bending resistance that can withstand bending at the hinge HJ.

  Next, the microphone device MC provided in the casing KTS of the transmitter side SG of the mobile phone 1 will be described.

  Referring to FIG. 1 and FIGS. 4 to 8, the microphone device MC has a first sound hole 21 a provided at a substantially center in the width direction of the front case 11 and a substantially center in the width direction of the rear case 12. In addition, the second sound hole 21b is provided at a position shifted downward in the longitudinal direction of the housing KTS with respect to the first sound hole 21a. That is, the first sound hole 21a and the second sound hole 21b are provided on the center line TS along the longitudinal direction of the housing KTS. The first sound hole 21a and the second sound hole 21b are circular through holes having a diameter of, for example, several tenths of a millimeter to 1 millimeter.

  Then, the first microphone unit 32 disposed inside the housing KTS so as to receive the sound entering from the first sound hole 21a, the housing at a position shifted in the width direction with respect to the first microphone unit 32. A second microphone unit 33 disposed inside the KTS and a sound guide member 34 having a sound path SD for guiding the sound entering from the second sound hole 21b to be received by the second microphone unit 33 are provided. It has been.

  The first microphone unit 32 has a sound receiving diaphragm directed toward the front case 11, and the second microphone unit 33 has the sound receiving diaphragm directed toward the rear case 12. ing. That is, the first microphone unit 32 and the second microphone unit 33 are opposite in direction of sound reception.

  A plurality of dummy microphone holes 22 are provided below the first sound hole 21 a in the front case 11. The dummy microphone hole 22 is closed by an adhesive tape attached to the back surface.

  As shown in FIGS. 6 and 7, the first microphone unit 32 and the second microphone unit 33 are mounted on the surface of the printed circuit board 31 on the rear case 12 side, that is, on the same side of each other. Yes. The printed circuit board 31 is provided with a third sound hole 21c for guiding sound to the first microphone unit 32 at a position corresponding to the first sound hole 21a. A gasket 36 is provided between the front case 11 and the printed board 31 to guide the sound entering from the first sound hole 21a to the third sound hole 21c.

  The gasket 36 is a thin plate having a rectangular outer shape made of synthetic rubber such as urethane rubber or synthetic resin, a circular hole 36a is provided in the center, and a mesh 36b is attached to the hole 36a. Become.

  The printed circuit board 31 has circuit elements, arithmetic elements, memory elements, other LSIs, connectors, and the like necessary for the function of the mobile phone 1 on the same surface as the first microphone unit 32 is mounted. Electronic components are mounted using surface mounting technology or the like.

  6 and 9 to 12, the sound guide member 34 is manufactured by molding a synthetic resin such as an ABS resin. The sound guide member 34 faces the inner surface of the rear case 12 and faces the surface of the second microphone unit 33 and the large pad portion 34a provided with a hole 341 so as to surround the second sound hole 21b. It has a small pad portion 34b and a peripheral wall portion 34c that connects the large pad portion 34a and the small pad portion 34b to form the sound path SD.

  The outer shape of the large pad portion 34a is oval, and the outer shape of the small pad portion 34b is rectangular. The inner peripheral surface of the peripheral wall portion 34c has a tapered surface shape extending from the hole 341 of the large pad portion 34a to the hole 342 of the small pad portion 34b, that is, a deformed conical surface shape. The sound guide member 34 is attached to the rear case 12 in a state where the axial center line along the longitudinal direction of the large pad portion 34a is inclined with respect to the width direction line of the housing KTS.

  The rear case 12 is provided with a holding wall portion 121 for holding the sound guide member 34 by fitting the large pad portion 34a. That is, the holding wall portion 121 is formed in an oval shape as a whole so as to surround the outer periphery of the large pad portion 34a. Protrusions 343 to 346 for being held in a normal posture by the holding wall portion 121 are provided on the peripheral wall portion 34 c of the sound guide member 34. The holding wall 121 is cut out in accordance with the positions of the protrusions 343 to 346 so that all or a part of the holding wall 121 fits in well.

  In other words, these protrusions 343 to 346 are correctly held in posture so that the direction and posture of the sound guide member 34 are not mistaken when assembled in the holding wall portion 121 of the rear case 12 and are attached. It is provided as follows.

  Note that adhesive tapes 35a and 35b are respectively attached to the surface of the large pad portion 34a and the surface of the small pad portion 34b. With these adhesive tapes 35 a and 35 b, the sound guide member 34 is fixed in close contact with the surface of the rear case 12 and the surface of the second microphone unit 33.

  Therefore, the sound entering from the first sound hole 21a vibrates the diaphragm of the first microphone unit 32 through the mesh 36b, the hole 36a, and the third sound hole 21c. Further, the sound entering from the second sound hole 21 b is guided by the sound path SD of the sound guide member 34 and vibrates the diaphragm of the second microphone unit 33.

  In FIG. 13, both the first sound hole 21a and the second sound hole 21b are provided on the center line TS of the housing KTS, and they are shifted from each other by a distance L2 in a front view. The first microphone unit 32 and the second microphone unit 33 are arranged so that the directions of sound reception are opposite to each other on the same plane in the depth direction of the housing KTS. The first microphone unit 32 is close to the user's mouth, which is the target sound source, and the second microphone unit 33 is far from the target sound source. In addition, it can be said that the first microphone unit 32 and the second microphone unit 33 have substantially the same conditions for environmental sound (noise).

  Since the first microphone unit 32 and the second microphone unit 33 receive sound in opposite directions, environmental sound, that is, noise is received in opposite phases. Therefore, by adding the output signals of the first microphone unit 32 and the second microphone unit 33, most of the environmental sound, that is, noise can be eliminated.

  That is, in FIG. 14, the output signal S1 of the first microphone unit 32 and the output signal S2 of the second microphone unit 33 are amplified by the amplifiers 321 and 322 and quantized by the AD converters 323 and 324, respectively. Thereafter, the two signals S1a and S2a are added at an appropriate level by the synchronous subtraction unit 325, and the audio signal S3 in which noise is suppressed is output.

  As shown in FIG. 15, the audio signal S3 has high directivity with high sensitivity to the target sound source and low sensitivity with respect to the sound source in the reverse direction. Therefore, good directivity can be obtained for the voice produced by the user, and the noise canceling effect is great for the sound source of the environmental sound. In addition, the directivity is almost symmetrical, and the usability does not change between right-handed users and left-handed users.

  Thus, in the mobile phone 1 of the present embodiment, by mounting the microphone device MC having a double microphone structure, ambient noise can be suppressed and the user's voice can be clarified. Since the first microphone unit 32 and the second microphone unit 33 are disposed at positions shifted from each other in the width direction and the sound is guided to the second microphone unit 33 using the sound guide member 34, the noise canceling effect is reduced. Without this, the length of the mobile phone 1 can be shortened to reduce the size of the device. In addition, since the first microphone unit 32 and the second microphone unit 33 are mounted on the same surface of the printed circuit board 31, the printed circuit board 31 can be easily designed, mounted, and assembled.

  In the embodiment described above, various types of first microphone unit 32 and second microphone unit 33 can be used. The microphone units 32 and 33 shown in the figure are rectangular in front view, but may be various other shapes such as a circle, an ellipse, and a polygon. Moreover, it can be set as various appropriate also about those dimensions.

  In the embodiment described above, the shapes of the front case 11 and the rear case 12 may be various shapes other than those described above. For example, the front case 11 and the rear case 12 may be flat. These front-view shapes may be rectangular, egg-shaped, elliptical, oval, polygonal, or other various shapes. A structure in which another member is interposed between the front case 11 and the rear case 12 may be employed.

  In the above-described embodiment, the front case 11, the rear case 12, the printed circuit board 31, the sound guide member 34, the microphone device MC, the configuration of the whole or each part of the mobile phone 1, the structure, the shape, the dimensions, the molding method, the production The method, arrangement, number, material, position and the like can be variously changed in addition to those described above.

  In the example described above, the foldable mobile phone 1 has been described. However, the mobile phone is not a foldable mobile phone, various mobile terminals other than the mobile phone, fixed telephones, communication devices, computer devices, game devices, and other electronic devices. The present invention can also be applied to the above.

The embodiment described below is also included in this embodiment.
(Appendix 1)
In microphone devices in electronic equipment,
A front case and a rear case forming at least a part of the housing;
A first sound hole provided at substantially the center in the width direction of the front case;
A second sound hole provided at a position approximately in the center of the width direction of the rear case and shifted in the longitudinal direction of the housing with respect to the first sound hole;
A first microphone unit disposed inside the housing in a direction toward the front case so as to receive sound entering from the first sound hole;
A second microphone unit disposed inside the housing in a direction toward the rear case at a position shifted in the width direction with respect to the first microphone unit;
A sound guide member having a sound path that guides the sound from the second sound hole so that the second microphone unit receives the sound;
A microphone device in an electronic apparatus.
(Appendix 2)
The sound guide member is
A large pad portion provided with a hole so as to face the inner surface of the rear case and surround the second sound hole;
A small pad portion facing the surface of the second microphone unit;
A peripheral wall portion that connects between the large pad portion and the small pad portion to form the sound path;
Having
A microphone device in the electronic apparatus according to appendix 1.
(Appendix 3)
A board on which electronic components are mounted is disposed inside the housing,
The first microphone unit and the second microphone unit are mounted on the same surface of the substrate;
A microphone device in the electronic apparatus according to appendix 1 or 2.
(Appendix 4)
The first microphone unit and the second microphone unit are mounted on a surface of the substrate on the rear case side,
The board is provided with a third sound hole for guiding sound to the first microphone unit at a position corresponding to the first sound hole,
Between the front case and the substrate, there is provided a gasket for guiding sound entering from the first sound hole to the third sound hole,
The microphone device in the electronic device according to attachment 3.
(Appendix 5)
The large pad portion has an oval outer shape,
The peripheral wall portion has a tapered surface shape whose inner peripheral surface extends from the hole of the large pad portion to the hole of the small pad portion,
The axial center line along the longitudinal direction of the large pad portion is attached to the rear case in a state of being inclined with respect to the width direction line of the housing.
The microphone device in the electronic device according to attachment 2.
(Appendix 6)
The rear case is provided with a holding wall portion for holding the sound guide member by fitting the large pad portion.
The peripheral wall portion of the sound guide member is provided with a protrusion for being held in a normal posture by the holding wall portion,
The microphone device in the electronic device according to appendix 5.
(Appendix 7)
In a mobile phone in which at least a part of a housing is formed by a front case and a rear case,
A first sound hole provided at substantially the center in the width direction of the front case;
A second sound hole provided at a position approximately in the center of the width direction of the rear case and shifted in the longitudinal direction of the housing with respect to the first sound hole;
A first microphone unit disposed inside the housing so as to receive sound entering from the first sound hole;
A second microphone unit disposed inside the housing at a position displaced in the width direction with respect to the first microphone unit;
A sound guide member having a sound path that guides the sound from the second sound hole so that the second microphone unit receives the sound;
A mobile phone having.
(Appendix 8)
The sound guide member is
A large pad portion provided with a hole so as to face the inner surface of the rear case and surround the second sound hole;
A small pad portion facing the surface of the second microphone unit;
A peripheral wall portion that connects between the large pad portion and the small pad portion to form the sound path;
Having
The mobile phone according to appendix 7.
(Appendix 9)
A board on which electronic components are mounted is disposed close to the inner surface of the front case,
The first microphone unit and the second microphone unit are mounted on the surface of the substrate on the rear case side,
The board is provided with a third sound hole for guiding sound to the first microphone unit at a position corresponding to the first sound hole,
Between the front case and the substrate, there is provided a gasket for guiding sound entering from the first sound hole to the third sound hole,
The mobile phone according to appendix 7 or 8.
(Appendix 10)
A first sound hole and a second sound hole provided at substantially the center in the width direction on the front side and the rear side of the housing are provided, and on the front side so as to receive sound entering from the first sound hole. It is used for a double microphone structure in which a first microphone unit is arranged in a direction toward and a second microphone unit is arranged in a direction toward the rear side at a position shifted in the width direction with respect to the first microphone unit. A sound guide member,
A large pad portion provided with a hole so as to face the inner side surface on the rear side of the housing and surround the second sound hole;
A small pad portion facing the surface of the second microphone unit;
A peripheral wall portion that connects between the large pad portion and the small pad portion to form a sound path that guides the sound that enters from the second sound hole so that the second microphone unit receives the sound; and
A sound guide member for a double microphone structure.

1 Mobile phone (electronic equipment)
11 Front case 12 Rear case 21a First sound hole 21b Second sound hole 21c Third sound hole 31 Printed circuit board (board)
32 First microphone unit 33 Second microphone unit 34 Sound conducting member 34a Large pad portion 34b Small pad portion 34c Peripheral wall portion 341 Hole 343 to 346 Protrusion 36 Gasket 121 Holding wall portion 343 to 346 Protrusion MC Microphone device KTS Housing SD Sound road

Claims (7)

In microphone devices in electronic equipment,
A front case and a rear case forming at least a part of the housing;
A first sound hole provided at substantially the center in the width direction of the front case;
A second sound hole provided at a position approximately in the center of the width direction of the rear case and shifted in the longitudinal direction of the housing with respect to the first sound hole;
A first microphone unit disposed inside the housing in a direction toward the front case so as to receive sound entering from the first sound hole;
A second microphone unit disposed inside the housing in a direction toward the rear case at a position shifted in the width direction with respect to the first microphone unit;
A sound guide member having a sound path that guides the sound from the second sound hole so that the second microphone unit receives the sound;
A microphone device in an electronic apparatus. The sound guide member is
A large pad portion provided with a hole so as to face the inner surface of the rear case and surround the second sound hole;
A small pad portion facing the surface of the second microphone unit;
A peripheral wall portion that connects between the large pad portion and the small pad portion to form the sound path;
Having
The microphone device in the electronic apparatus according to claim 1. A board on which electronic components are mounted is disposed inside the housing,
The first microphone unit and the second microphone unit are mounted on the same surface of the substrate;
The microphone device in the electronic apparatus according to claim 1 or 2. The first microphone unit and the second microphone unit are mounted on a surface of the substrate on the rear case side,
The board is provided with a third sound hole for guiding sound to the first microphone unit at a position corresponding to the first sound hole,
Between the front case and the substrate, there is provided a gasket for guiding sound entering from the first sound hole to the third sound hole,
The microphone device in the electronic device according to claim 3. The large pad portion has an oval outer shape,
The peripheral wall portion has a tapered surface shape whose inner peripheral surface extends from the hole of the large pad portion to the hole of the small pad portion,
The axial center line along the longitudinal direction of the large pad portion is attached to the rear case in a state of being inclined with respect to the width direction line of the housing.
The microphone device in the electronic apparatus according to claim 2. In a mobile phone in which at least a part of a housing is formed by a front case and a rear case,
A first sound hole provided at substantially the center in the width direction of the front case;
A second sound hole provided at a position approximately in the center of the width direction of the rear case and shifted in the longitudinal direction of the housing with respect to the first sound hole;
A first microphone unit disposed inside the housing so as to receive sound entering from the first sound hole;
A second microphone unit disposed inside the housing at a position displaced in the width direction with respect to the first microphone unit;
A sound guide member having a sound path that guides the sound from the second sound hole so that the second microphone unit receives the sound;
A mobile phone having. A first sound hole and a second sound hole provided at substantially the center in the width direction on the front side and the rear side of the housing are provided, and on the front side so as to receive sound entering from the first sound hole. A sound guide member in which a first microphone unit is disposed in a direction toward the second microphone unit, and a second microphone unit is disposed in a direction toward the rear side at a position shifted in the width direction with respect to the first microphone unit;
A large pad portion provided with a hole so as to face the inner side surface on the rear side of the housing and surround the second sound hole;
A small pad portion facing the surface of the second microphone unit;
A peripheral wall portion that connects between the large pad portion and the small pad portion to form a sound path that guides the sound that enters from the second sound hole so that the second microphone unit receives the sound; and
A sound guide member.

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