WO2013099068A1

WO2013099068A1 - Portable electronic apparatus

Info

Publication number: WO2013099068A1
Application number: PCT/JP2012/006389
Authority: WO
Inventors: 健史伊藤; 大澤　貴久
Original assignee: Ｎｅｃカシオモバイルコミュニケーションズ株式会社; Ｎｅｃアクセステクニカ株式会社
Priority date: 2011-12-28
Filing date: 2012-10-04
Publication date: 2013-07-04

Abstract

[Problem] To reduce, in a cellular phone, the space taken up by a microphone in the directions orthogonal and parallel to the thickness direction of a case. [Solution] An inner surface of a front case (1), said inner surface being at the periphery of the innermost portion of a sound path (11), is formed as a tilted surface (1a), which is tilted approximately 45° with respect to the thickness direction of the front case (1), and a microphone unit (21) is fixed to the tilted surface (1a) with a water-resistant film unit (12) therebetween. As a result, compared with when a microphone (25), including a water-resistant film unit (22), is disposed such that a sound collecting surface of the microphone is orthogonal or parallel to the thickness direction of the front case (1), the space taken up by the microphone (25) including the water-resistant film unit (22) can be reduced in the directions orthogonal and parallel to the thickness direction of the front case (1).

Description

Portable electronic devices

The present invention relates to a portable electronic device such as a cellular phone.

Some conventional mobile phones reduce noise entering the microphone by preventing direct exposure of the microphone (for example, see Patent Document 1). In the mobile phone described in Patent Document 1, a sound hole is provided on one surface in the thickness direction of the case. A sound path forming member having a sound path made of a groove is provided inside the sound hole portion of the case. One end of the sound path communicates with the sound hole. A microphone is attached to a microphone attachment portion provided at the other end of the sound path forming member. In this mobile phone, the exhaled air entering from the sound hole enters the microphone through the sound path, so that the exhaled air does not directly hit the microphone.

JP-A-7-202997

By the way, it is conceivable that the microphone is fixed to the inner surface of the case via a double-sided adhesive tape, instead of attaching the microphone to the microphone mounting portion provided at the other end of the sound path forming member. However, in this case, there is a problem that the space occupied in the direction orthogonal to the thickness direction of the microphone case including the double-sided adhesive tape becomes relatively large.

Therefore, an object of the present invention is to provide a portable electronic device that can reduce not only the space in the direction perpendicular to the thickness direction of the microphone case but also the space in the parallel direction.

A portable electronic device according to the present invention includes a case having a sound hole, a microphone provided in the case so that a sound collection surface is inclined with respect to a thickness direction of the case, the sound hole, And a sound path provided between the microphone and the sound collection surface.

According to the present invention, the space occupied in the direction parallel to the direction perpendicular to the thickness direction of the microphone case can be reduced as well as the space occupied in the parallel direction.

1 is a perspective view of a mobile phone as a first embodiment of the present invention. The perspective view which notched some mobile phones shown in FIG. FIG. 3 is an enlarged perspective view of a notched portion in FIG. 2. Sectional drawing which looked at the notched part of FIG. 3 from the right side. Sectional drawing similar to FIG. 4 shown in order to demonstrate the case where a thin rod-shaped foreign material is inserted in the sound hole. The perspective view of a part shown in order to demonstrate incorporation of a microphone unit. The perspective view similar to FIG. 6 which shows the state which incorporated the microphone unit. FIG. 5 is a cross-sectional view similar to FIG. 4 for explaining the reason why the mobile phone shown in FIG. 4 can be thinned. Sectional drawing similar to FIG. 4 of the mobile telephone as 2nd Embodiment of this invention. Sectional drawing similar to FIG. 4 of the mobile telephone as 3rd Embodiment of this invention.

(First embodiment)
FIG. 1 shows a perspective view of a mobile phone as a first embodiment of the present invention, FIG. 2 shows a perspective view in which a part of the mobile phone shown in FIG. 1 is cut out, and FIG. 3 shows a cutout in FIG. The enlarged perspective view of a part is shown. In this mobile phone, a rear case 2 is provided below the front case 1, and a battery cover 3 is provided below a predetermined part of the rear case 2. The front case 1, the rear case 2, and the battery lid 3 are made of polycarbonate or the like. A display unit 4, a touch panel 5 and a screen glass 6 are provided on the upper surface of the front case 1. In FIGS. 1 and 2, a rectangular area indicated by reference numeral 7 is a display unit. A sound hole 8 is provided on the right side of the front side wall of the front case 1.

Next, FIG. 4 shows a cross-sectional view of the notched portion of FIG. 3 as viewed from the right side. A sound path 11 made of a cavity is provided at a predetermined location of the front case 1. The sound path 11 communicates with the sound hole 8 and is formed in a first sound path 11a that is substantially orthogonal to the thickness direction of the front case 1 (vertical direction in FIG. 4), and at the back of the first sound hole 11a. The second sound path 11b that communicates and extends downward in parallel with the thickness direction of the front case 1 is formed to be bent in an approximately L shape.

The inner surface of the front case 1 around the back of the second sound path 11b is an inclined surface 1a that is inclined at approximately 45 ° with respect to the thickness direction of the front case 1. A waterproof membrane unit 12 is fixed to the inclined surface 1a. The waterproof membrane unit 12 has a structure in which double-sided

adhesive tapes

14 and 15 are affixed to the outer periphery of the upper surface and the outer periphery of the lower surface of the sheet-like waterproof film 13. The waterproof film 13 is formed of a resin such as polyethylene terephthalate that allows air to pass but not water.

Openings

16 and 17 are provided in the center portion of the double-sided

adhesive tapes

14 and 15, that is, the portion corresponding to the back portion of the second sound path 11b.

The upper surface of the upper double-sided adhesive tape 14 is fixed to the inclined surface 1a of the front case 1. A microphone unit 21 is fixed to the lower surface of the lower double-sided adhesive tape 15. In the microphone unit 21, the upper surface of one end portion of the flexible wiring board 23 is fixed to the lower surface of the reinforcing plate 22 via an adhesive (not shown), and the microphone is attached to the lower surface of one end portion of the flexible wiring board 23 via a double-sided adhesive tape 24. The sound collecting surface side of 25 is fixed. An opening (reference numeral omitted) is provided in the central portion of the reinforcing plate 22, the flexible wiring board 23 and the double-sided adhesive tape 24, that is, the portion corresponding to the opening 17 of the double-sided adhesive tape 15.

The inner surface of the rear case 2 at a portion facing the inclined surface 1a of the front case 1 is an inclined surface 2a parallel to the inclined surface 1a of the front case 1. A sheet-like cushion member 26 made of foamed urethane rubber or the like is fixed to the inclined surface 2a. When the front case 1 and the rear case 2 are integrated with screws (not shown), the lower surface (non-sound collecting surface) of the microphone 25 is pressed against the cushion member 26, and the reinforcing plate 22 is bonded on both sides. It is pressed against the tape 15 to stabilize the fixing of the microphone 25.

A waterproof groove 31 is provided in a ring shape on the outer periphery of the lower surface of the front case 1 (see FIG. 3). A sealing member 32 made of silicone rubber or the like is press-fitted inside the waterproof groove 31. A protrusion 33 is provided in a ring shape at a portion corresponding to the waterproof groove 31 in the outer peripheral portion of the upper surface of the rear case 2. In a state in which the front case 1 and the rear case 2 are integrated with screws (not shown), the protrusion 33 is pressed against the seal member 32 to seal between the front case 1 and the rear case 2. ing.

In FIG. 4, what is indicated by reference numeral 34 is a double-sided adhesive tape for fixing the outer peripheral portion of the lower surface of the touch panel 5 to the upper surface of the front case 1. What is indicated by reference numeral 35 is a sealing member for sealing between the rear case 2 and the battery lid 3.

As described above, in this mobile phone, the inner surface of the front case 1 around the back of the second sound path 11b is an inclined surface 1a that is inclined at approximately 45 ° with respect to the thickness direction of the front case 1, Since the microphone unit 21 is fixed to the inclined surface 1 a via the waterproof membrane unit 22, the microphone 25 in both

cases

1 and 2 has a sound collection surface of approximately 45 ° with respect to the thickness direction of the front case 1. It will be arranged to incline.

As a result, the thickness of the front case 1 of the microphone 25 is compared with the case where the microphone 25 is disposed so that the sound collection surface thereof is orthogonal to the thickness direction of the front case 1 and parallel. The space occupied in the direction orthogonal to the direction and the space occupied in the parallel direction can be reduced.

Here, the width of the double-sided adhesive tape 14 on the waterproof membrane unit 12 needs to be about 1 to 1.5 mm in order to obtain waterproof reliability. Therefore, the size of the microphone 25 including the waterproof membrane unit 12 is relatively large. Therefore, when the microphone 25 including the waterproof membrane unit 12 is disposed in both the

cases

1 and 2 so that the sound collection surface is inclined by approximately 45 ° with respect to the thickness direction of the front case 1, the microphone including the waterproof membrane unit 22 is disposed. The space occupied in the direction orthogonal to the thickness direction of the 25 front cases 1 and the space occupied in the parallel direction can be reduced.

Further, in this mobile phone, the sound path 11 is communicated with the sound hole 8, and the first sound path 11 a that is substantially orthogonal to the thickness direction of the front case 1 and the back of the first sound path 11 a. The second sound path 11b that is communicated and extends downward substantially parallel to the thickness direction of the front case 1 is formed so as to be bent substantially in an L shape. For example, as shown in FIG. Even if a thin rod-like foreign material 41 is inserted from the sound hole 8, the sound collecting surface of the waterproof film 23 and the microphone 25 can be prevented from being damaged.

Further, in this mobile phone, as shown in FIG. 1, since the sound hole 8 is provided on the right side of the front side wall of the front case 1, the sound hole 8 is blocked by a cheek or a finger in a normal call state. Therefore, it is possible to avoid the possibility that the telephone call becomes difficult unintentionally by the user.

Next, the case of incorporating the microphone unit 21 will be described with reference to a partial perspective view shown in FIG. First, the front case 1 is turned over, and the inclined surface 1a is set to the upper side. In this case, positioning concave portions 42 are provided on the inner surface of the front case 1 on both the left and right sides of the inclined surface 1a. Next, the microphone unit 21 is prepared by attaching the double-sided adhesive tape 15 of the waterproof membrane unit 12 to the lower surface of the microphone unit 21. In this case, positioning protrusions 43 are provided on both left and right ends of the reinforcing plate 22.

Next, when the double-sided adhesive tape 14 of the waterproof membrane unit 12 is attached to the inclined surface 1a of the front case 1 while the positioning protrusion 43 of the microphone unit 21 is fitted in the positioning recess 42 of the front case 1, as shown in FIG. Thus, the microphone unit 21 is incorporated. In this case, since the double-sided adhesive tape 14 can be affixed to the inclined surface 1a from above, the workability is good and the double-sided adhesive tape 14 can be pressed with the intended load for the intended time, Adhesion of the double-sided adhesive tape 14 can be made favorable. Note that only the waterproof membrane unit 12 may be attached to the inclined surface 1 a of the front case 1, and then the microphone unit 21 may be fixed to the waterproof membrane unit 12.

By the way, this cellular phone can be made thinner. That is, as shown in FIG. 8, when the sound path 11 is a cavity that connects the sound hole 8 and the opening 16 of the double-sided adhesive tape 14 of the waterproof unit 12 with an oblique straight line, the front in the vicinity of the sound path 11 is used. The thickness of the waterproof groove 31 of the case 1 becomes extremely thin. A portion of the waterproof groove 31 of the front case 1 in the vicinity of the sound path 11 receives pressure accompanying compression of the seal member 32, and therefore needs a certain degree of rigidity, that is, thickness.

Therefore, if the thickness of the waterproof groove 31 of the front case 1 is increased to some extent, the rear case 2 is inevitably shifted to the lower side in FIG. 8 and the thickness is increased accordingly. On the other hand, in FIG. 4, the sound path 11 is formed as a cavity bent in a substantially L shape, and a part of the seal member 32 is disposed inside the sound path 11 bent in a substantially L shape. A sufficient thickness of the waterproof groove 31 of the front case 1 in the vicinity of the road 11 can be secured, and as a result, the thickness can be further reduced.

(Second Embodiment)
FIG. 9 is a sectional view similar to FIG. 4 of a mobile phone as a second embodiment of the present invention. This cellular phone is different from the cellular phone shown in FIG. 4 in that the sound path 11 is not bent in a substantially L shape but is bent in a substantially arc shape. In this case as well, as in the case shown in FIG. 5, even if a thin stick-shaped foreign object 41 is inserted from the sound hole 8, the sound collecting surfaces of the waterproof film 23 and the microphone 25 can be prevented from being damaged. In addition, by arranging a part of the seal member 32 inside the sound path 11 bent in a substantially arc shape, a sufficient thickness of the waterproof groove 31 of the front case 1 in the vicinity of the sound path 11 is ensured. Can do.

(Third embodiment)
FIG. 10 is a sectional view similar to FIG. 4 of a mobile phone as a third embodiment of the present invention. This cellular phone is greatly different from the cellular phone shown in FIG. 4 in that the sound hole 8 and the sound path 11 are provided not in the front case 1 but in the rear case 2. Therefore, the microphone unit 21 is fixed to the inclined surface 2 b provided in the rear case 2 around the back of the sound path 11 via the waterproof unit 12. A cushion member 51 is provided on the inclined surface 1 b provided on the front case 1 in a portion facing the inclined surface 2 b of the rear case 2.

In this case, a waterproof groove 52 is provided in a ring shape on the outer periphery of the upper surface of the rear case 2. A seal member 53 is press-fitted inside the waterproof groove 52. A protrusion 54 is provided in a ring shape at a portion corresponding to the waterproof groove 52 in the outer peripheral portion of the lower surface of the front case 1. In a state where the front case 1 and the rear case 2 are integrated with screws (not shown), the projection 54 is pressed against the seal member 53 to seal between the front case 1 and the rear case 2. ing.

The present invention is not limited to a mobile phone, but also applies to portable electronic devices such as PHS (Personal Handyphone System), PDA (Personal Data Assistance, Personal Personal Digital Assistance), and notebook personal computers. be able to.

Hereinafter, various aspects of the present invention will be collectively described as supplementary notes.

(Appendix 1)
The invention of Supplementary Note 1 includes a case having a sound hole, a microphone provided in the case so that a sound collection surface is inclined with respect to a thickness direction of the case, and a sound collection of the sound hole and the microphone. A portable electronic device comprising a sound path provided between a surface and a sound path.

(Appendix 2)
The invention of appendix 2 is the portable electronic device according to appendix 1, wherein the sound collection surface of the microphone is inclined by 45 ° with respect to the thickness direction of the case.

(Appendix 3)
The invention according to appendix 3 is the invention according to

appendix

1 or 2, wherein the case includes a front case and a rear case, and the sound hole and the sound path are provided in either the front case or the rear case. A portable electronic device is provided.

(Appendix 4)
The invention according to appendix 4 is the invention according to appendix 3, wherein a cushion member is provided in a portion of the other of the front case and the rear case facing a non-sound collecting surface opposite to the sound collecting surface of the microphone. A portable electronic device is provided in pressure contact with a non-sound collecting surface of the microphone.

(Appendix 5)
The invention of appendix 5 is the portable electronic device according to appendix 3, wherein the sound hole is provided on a side wall of one of the front case and the rear case. .

(Appendix 6)
The invention of appendix 6 is the portable electronic device according to appendix 5, wherein the sound path is bent.

(Appendix 7)
The invention according to appendix 7 is the invention according to appendix 6, wherein a part of a sealing member for sealing between the front case and the rear case is provided inside the bent portion of the sound path. A portable electronic device.

(Appendix 8)
The invention according to appendix 8 is the portable electronic device according to any one of appendices 1 to 7, wherein a waterproof film is provided between the sound path and the sound collecting surface of the microphone. is there.

DESCRIPTION OF SYMBOLS 1 Front case 2 Rear case 3 Battery cover 8 Sound hole 11 Sound path 12 Waterproof membrane unit 13 Waterproof membrane 21 Microphone unit 25 Microphone 26 Cushion member 32 Seal member

Claims

A case having a sound hole, a microphone provided in the case so that a sound collecting surface is inclined with respect to a thickness direction of the case, and provided between the sound hole and the sound collecting surface of the microphone A portable electronic device, comprising:
2. The portable electronic device according to claim 1, wherein a sound collection surface of the microphone is inclined by 45 ° with respect to a thickness direction of the case.
3. The invention according to claim 1, wherein the case includes a front case and a rear case, and the sound hole and the sound path are provided in one of the front case and the rear case. A portable electronic device characterized by
According to the third aspect of the present invention, a cushion member is disposed at a portion of the other of the front case and the rear case that faces the non-sound collecting surface opposite to the sound collecting surface of the microphone. A portable electronic device characterized by being provided in pressure contact with a sound surface.
4. The portable electronic device according to claim 3, wherein the sound hole is provided on a side wall of one of the front case and the rear case.
6. The portable electronic device according to claim 5, wherein the sound path is bent.
The invention according to claim 6 is characterized in that a part of a seal member for sealing between the front case and the rear case is provided inside the bent portion of the sound path. Portable electronic devices.
The portable electronic device according to any one of claims 1 to 7, wherein a waterproof film is provided between the sound path and a sound collecting surface of the microphone.