JP2010034684A - Waterproof acoustic structure, and electronic apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent failure in emission or collection of sounds even if water permeates into an opening portion of a sound processing section having a primary diaphragm in an acoustic device such as a loudspeaker and a microphone. <P>SOLUTION: The acoustic device is provided with: a sound processing section 52 having a primary diaphragm for emitting or collecting sounds; a secondary diaphragm 54 provided to be waterproof on the sound processing section 52 and vibrating in response to a sound from the sound processing section 52 or the outside; and a movable cover 56 on the secondary diaphragm 54 and allowing a space formed between itself and the secondary diaphragm 54 to be movable depending on the presence or absence of the action of an external force. Drainage channels 42, 43 for draining water permeating the space between the movable cover 56 and the secondary diaphragm 54 by depressing the movable cover 56 is provided around the movable cover 56. In more detail, the drainage channels 42, 43 are formed between the movable cover 56 and an upper case 14 having an opening portion 41 in which the movable cover 56 is movably incorporated. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a waterproof acoustic structure provided in a sound processing unit having a primary diaphragm for sound generation or sound collection, and an electronic device including the waterproof acoustic structure.

For example, there is one in which a waterproof secondary diaphragm is provided on the upper part of a speaker having a non-waterproof primary diaphragm (see Patent Document 1).
Japanese Patent Laid-Open No. 11-69472

However, in Patent Document 1, a waterproof secondary diaphragm is provided on the upper part of a speaker having a non-waterproof primary diaphragm, but water droplets remain on the secondary diaphragm. In some cases, there was a risk of noise.
Further, when water enters the opening of the speaker or microphone, there is a risk that sound generation or sound collection may be impossible.

  An object of the present invention is to prevent sound generation and sound collection failure even in the case where water enters the opening of a sound processing unit having a primary diaphragm in an acoustic device such as a speaker or a microphone.

  In order to solve the above-mentioned problems, the invention according to claim 1 is characterized in that a sound processing unit having a primary diaphragm for sound generation or sound collection, and a sound processing unit provided on the sound processing unit in a waterproof manner. A movable cover that changes the space formed between the secondary diaphragm that vibrates by the processing unit or external sound and the secondary diaphragm, depending on the presence or absence of an external force. And a waterproof acoustic structure.

  The invention according to claim 2 is the waterproof acoustic structure according to claim 1, wherein water that has entered the space between the secondary diaphragm and the periphery of the movable cover is pushed into the movable cover. It is characterized by providing the drainage channel for making it discharge by.

  Invention of Claim 3 is the waterproof acoustic structure of Claim 2, Comprising: The said drainage channel is between the said movable cover and the upper case which has an opening part in which the said movable cover is incorporated movably. It is formed.

  The invention according to claim 4 is the waterproof acoustic structure according to any one of claims 1 to 3, wherein an opening is formed in the center of the movable cover.

  The invention according to claim 5 is the waterproof acoustic structure according to any one of claims 1 to 4, wherein the movable cover is formed of an inelastic member, and the movable cover is formed from the secondary diaphragm. It is characterized by comprising a spring that urges in the direction of separation.

  Invention of Claim 6 is the waterproof acoustic structure as described in any one of Claim 1-5, Comprising: The said movable cover is formed with the elastic member, and was spaced apart from the said secondary diaphragm. It is arranged at a position.

  The invention according to claim 7 is the waterproof acoustic structure according to any one of claims 1 to 6, further comprising a protrusion that holds the periphery of the secondary diaphragm, and the secondary vibration. A backup member for suppressing resonance of the plate is provided, and the movable cover is formed with a recess corresponding to the protrusion around the secondary diaphragm held over the protrusion of the backup member. It is characterized by being.

  Invention of Claim 8 is an electronic device provided with the sound processing part which has a primary diaphragm for sound-producing or collecting sound, Comprising: The waterproof acoustic structure as described in any one of Claim 1 to 7 is provided. Features electronic equipment.

  According to the present invention, water droplets and the like can be easily drained even when the electronic device is submerged. Therefore, it is possible to prevent the occurrence of sound generation / sound collection with a speaker, a receiver, a microphone, or the like.

Hereinafter, the best mode for carrying out the present invention will be described in detail with reference to the drawings.
FIG. 1 shows a mobile phone as a configuration of an embodiment of an electronic apparatus to which the present invention is applied. 1 is a waterproof casing, 2 is a waterproof display unit, 3 is a waterproof operation unit, 4 is a waterproof receiver unit, 5 Is a waterproof microphone part, and 6 is a waterproof connector part.

The waterproof housing 1 has a seal structure between the upper and lower housings. The waterproof display unit 2 and the waterproof operation unit 3 are integrally formed of an elastic member and have a waterproof structure. The waterproof receiver unit 4 and the waterproof microphone unit 5 are waterproof while maintaining acoustic performance by insert molding a secondary diaphragm in the sound processing unit. Connection to the outside is made by the waterproof connector portion 6.
In the illustrated example, an integrated mobile phone is shown, but a foldable mobile phone or a slide mobile phone may be used.

  In the following embodiment, a secondary diaphragm structure that vibrates by sound waves is set as the waterproof / pressure-resistant structure of the waterproof microphone section 5, and the air is transmitted between the primary diaphragm and the secondary diaphragm structure of the waterproof microphone section 5. Use as a medium to generate (sound) or collect (collect) sounds. And when water infiltrates into the opening of the soundproof microphone 5, the sound can be generated and collected by simply draining.

(Embodiment 1)
FIG. 2 is an exploded view of the end including the waterproof microphone 5 of FIG. 1 as a configuration of the waterproof acoustic structure according to the first embodiment to which the present invention is applied. 11 is a lower casing, 12 is an upper casing, Reference numeral 13 is a lower case, 14 is an upper case, 41 is an opening, 44 is a drain, 54 is a secondary diaphragm, 55 is a yoke, 56 is a movable cover, and 57 is a spring.

  That is, the waterproof housing 1 is formed by combining the upper housing 12 with the upper surface of the lower housing 11 via a sealing structure and screwing, and further assembling the lower case 13 and the upper case 14 by a claw structure or screwing. Composed. The upper case 14 is formed with a circular opening 41 and an end drainage port 44.

  In addition, a secondary diaphragm 54 is insert-molded integrally with a circular opening formed in the upper housing 12 via a yoke 55 that is an elastic holding member around the secondary diaphragm 54. Thereby, waterproofing at the opening of the upper housing 12 is achieved. A movable cover 56 is provided above the secondary diaphragm 54 and the surrounding yoke 55. The movable cover 56 is formed of a non-elastic member, is biased upward via a coiled spring 57, and is assembled with the opening 41 of the upper case 14 being prevented from coming off upward. In addition, the spring 57 is formed in a cone shape so as to reduce the dimension in the thickness direction during compression.

  3 and 4 show the assembled state of the waterproof microphone portion 5 of FIG. 2 in cross section, 42 is a drainage channel, 43 is a drainage channel, 51 is a substrate, 52 is a microphone, and 53 is a cylindrical case. .

  That is, in the upper case 14, a drainage channel 42 is formed by an annular groove around the opening 41, and a drainage channel 43 is formed by a straight groove that connects the drainage channel 42 and the drainage port 44. . In the lower housing 11, a microphone 52 that is a sound processing unit on the substrate 51 and a cylindrical case 53 that surrounds the microphone 52 are arranged.

  The cylindrical case 53 forms an opening 531 with a plurality of small circular holes penetrating in the center of the upper surface portion, and forms an annular protrusion 532 protruding upward around the upper surface portion, while penetrating in the upper portion of the peripheral surface portion. A radial passage 533 is formed. The upper surface portion of the cylindrical case 53 is a backup structure portion when an external force is applied to the secondary diaphragm 54 and the surrounding yoke 55.

  The yoke 55 around the secondary diaphragm 54 has an annular protrusion 552 that overlaps the protrusion 532 on the upper surface of the cylindrical case 53. Resonance of the secondary diaphragm 54 is suppressed by the annular protrusion 552 curved above the yoke 55.

  In addition, the movable cover 56 forms a circular opening 561 penetrating in the center, and an annular recess 562 corresponding to the protrusion 552 of the yoke 55 that overlaps the protrusion 532 of the cylindrical case 53 around the lower surface. On the other hand, a flange 563 is formed on the outer periphery. The flange 563 prevents the upper case 14 from coming off upward with respect to the opening 41.

  As described above, the yoke 55 around the secondary diaphragm 54 is integrally formed in the circular opening of the upper housing 12, thereby providing a reliable waterproof structure that is kept airtight from the outside.

  And between the primary diaphragm of the microphone 52 and the secondary diaphragm 54, the sealed waterproof space which communicates via the opening part 531 by the several small hole formed in the upper surface part of the cylindrical case 53 is formed. Has been. Further, a radial passage 533 of the cylindrical case 53 is located on the outer peripheral portion of the primary diaphragm of the microphone 52. Therefore, in the sealed waterproof space between the primary diaphragm and the secondary diaphragm 54 of the microphone 52, the surplus pressure is released to the inside of the housing 1 by the passage 533 with respect to the air that fluctuates due to the temperature. Prevents deterioration of characteristics.

As described above, according to the waterproof acoustic structure of the waterproof microphone portion 5 of the embodiment, the microphone 52 having the primary diaphragm can be provided with a waterproof function with a simple configuration. Moreover, since the yoke 55 and the secondary diaphragm 54 that is connected to the yoke 55 and vibrates by external sound are provided, sound collection can be performed efficiently.
Furthermore, by providing a backup structure when a high external pressure is applied to the secondary diaphragm 54 on the upper surface of the cylindrical case 53, a stable acoustic structure that is not damaged even at a high external pressure can be obtained.

  In addition, the mobile phone is provided with a movable cover 56 and a spring 57 that are formed on the secondary diaphragm 54 so that a space formed between the secondary diaphragm 54 and the secondary diaphragm 54 can be changed depending on the presence or absence of an external force. In the case where water is immersed, water droplets and the like that have entered the secondary diaphragm 54 and the surrounding yoke 55 can be easily drained from the circular opening 561 penetrating through the central portion of the movable cover 56. .

That is, as shown in FIGS. 5 to 6, when the movable cover 56 is pushed downward with a fingertip against the bias of the spring 57, the lower surface around the opening 561 at the center of the movable cover 56 becomes the secondary diaphragm 54. In close contact with the upper surface of the water, the water that has entered between them moves to the inner peripheral side and the outer peripheral side.
And the water which moved to the inner peripheral side is discharged | emitted from the center opening part 561 to the upper exterior as shown by the arrow in FIG.

Further, the water that has moved to the outer peripheral side moves to the annular protrusion 552 of the yoke 55 that overlaps the annular protrusion 532 on the upper surface of the cylindrical case 53, and around the lower surface of the movable cover 56 on the protrusion 552. The annular recess 562 closely contacts, and the water therebetween moves further to the outer peripheral side of the annular protrusion 552.
Then, in the periphery of the movable cover 56, the flange 563 around the movable cover 56 overlaps the upper surface around the opening of the upper housing 12 via a spring 57 that is elastically deformed in a flat shape. Thus, the upper case 14 moves to the drainage channel 42 formed by the annular groove around the opening 41.

Thus, the water moved to the drainage channel 42 is further drained to the outside through the drainage channel 43 by the straight groove and from the drainage port 44 at the end of the upper case 14.
The above-described pushing of the movable cover 56 is repeated several times until there is no water.
Accordingly, it is possible to prevent the sound collection of the microphone 52 from being poor.

  Further, the water discharged to the drainage channel 42 by the annular groove permeates into the inner peripheral side due to the presence of the annular protrusion 552 of the yoke 55 that overlaps the annular protrusion 532 on the upper surface of the cylindrical case 53. Be blocked.

  In the first embodiment, the diameter of the opening 561 at the center of the movable cover 56 is greatly changed upward in FIGS. 5 and 6 as the opening 561 having a uniform diameter in FIGS. 3 and 4. Although the opening 561 is used, any of them may be adopted.

(Embodiment 2)
7 and 8 show the waterproof microphone portion 5 of FIG. 1 as the configuration of the embodiment 2 of the waterproof acoustic structure to which the present invention is applied. Like the embodiment 1 described above, 11 is a lower housing, 12 is Upper housing, 13 lower case, 14 upper case, 41 opening, 42 drainage channel, 43 drainage channel, 44 drainage port, 51 substrate, 52 microphone, 53 cylindrical case, 531 Opening, 532 is a protrusion, 533 is a passage, 54 is a secondary diaphragm, 55 is a yoke, 552 is a protrusion, 58 is a movable cover, 581 is an opening, 582 is a recess, 583 is a flange, 584 Is a drainage channel.

  The second embodiment is different from the first embodiment in that a movable cover 58 made of a flexible elastic member having flexibility is used instead of the movable cover 56 and the spring 57 made of a non-elastic member in the first embodiment. Therefore, hereinafter, the configuration of the movable cover 58 made of an elastic member will be described, and the configuration of the other members is the same as in the first embodiment described above, and the description thereof will be omitted.

That is, the movable cover 58 is formed of an elastic member having flexibility, and similarly to the movable cover 56 of the inelastic member of the first embodiment, a circular opening 581 penetrating the center is formed, and the lower surface portion is formed. Around the periphery, an annular recess 582 corresponding to the protrusion 552 of the yoke 55 that overlaps the protrusion 532 of the cylindrical case 53 is formed, while a flange 583 is formed on the outer periphery.
Further, on the lower surface of the flange 583, a drainage channel 584 is formed by a plurality of radial grooves (four in the cross direction in FIG. 8). The lower surface of the flange 583 overlaps the upper surface around the opening of the upper housing 12.

  As described above, the waterproof acoustic structure of the waterproof microphone portion 5 of the second embodiment also includes the movable cover 58 made of an elastic member that can change the space formed between the secondary diaphragm 54 and the presence or absence of an external force. Therefore, as in the case of the first embodiment, when the mobile phone is submerged, the circular diaphragm 581 penetrating through the central portion of the movable cover 58 by the elastic member passes through the inner secondary diaphragm 54 and the surrounding yoke 55. Water droplets that have penetrated into can be easily drained.

That is, as shown in FIGS. 9 to 10, when the movable cover 58 is pushed downward with its fingertip by its elastic force, the lower surface around the central opening 581 of the movable cover 58 is brought into close contact with the upper surface of the secondary diaphragm 54. In the meantime, the water that has entered in the meantime moves to the inner peripheral side and the outer peripheral side.
And the water which moved to the inner peripheral side is discharged | emitted from the center opening part 581 to the upper exterior as shown by the arrow in FIG.

Further, the water that has moved to the outer peripheral side moves to the annular protrusion 552 of the yoke 55 that overlaps the annular protrusion 532 on the upper surface of the cylindrical case 53, and around the lower surface of the movable cover 58 on the protrusion 552. The annular recess 582 is brought into close contact, and the water therebetween moves further to the outer peripheral side of the annular protrusion 552.
Then, as indicated by an arrow in FIG. 10, it passes through a drainage channel 584 formed by a radial groove on the lower surface of the flange 583 around the movable cover 58 and moves to a drainage channel 42 formed by an annular groove around the opening 41 of the upper case 14. .

Thus, the water moved to the drainage channel 42 is further drained to the outside through the drainage channel 43 by the straight groove and from the drainage port 44 at the end of the upper case 14.
The above-described pushing of the movable cover 58 is repeated several times until there is no water.
Accordingly, it is possible to prevent the sound collection of the microphone 52 from being poor.

Other functions and effects are the same as those in the first embodiment described above, and a description thereof is omitted.
In the second embodiment, the upper case 14 and the movable cover 58 are separated from each other. However, if the upper case 14 is a flexible elastic material, the movable cover 58 may be integrated with the upper case 14.

(Modification)
In the above embodiment, the shape of the waterproof microphone is not limited to a circle, and may be any shape such as an ellipse, a quadrangle, a triangle, and the like.
In addition to the microphone, the sound processing unit may be a receiver or a speaker.
Furthermore, the sound processing unit is not limited to a small one, and may be, for example, a large speaker or an outdoor speaker.
Further, it may be a flat acoustic unit without a backup structure.
Furthermore, the movable cover may have a structure in which a bellows portion is provided to give elasticity.

(Other variations)
In the above embodiment, the cellular phone is used. However, the present invention is not limited to this, and all electronic devices such as a digital camera, a video camera, a PDA, a notebook computer, a wearable computer, a calculator, and an electronic dictionary are used. Can be used.
Further, the material and shape of each part are arbitrary, and it is needless to say that other specific detailed structures can be appropriately changed.

1 is a perspective view showing a configuration of an embodiment of an electronic apparatus to which the present invention is applied, showing a mobile phone. BRIEF DESCRIPTION OF THE DRAWINGS The structure of Embodiment 1 of the waterproof acoustic structure to which this invention is applied is shown, and it is a disassembled perspective view of the edge part containing the waterproof microphone part of FIG. It is the vertical side view which showed the assembly | attachment state of the waterproof microphone part of FIG. It is the perspective view seen from the left end part of FIG. It is the figure which showed the upper half part of the waterproof microphone part of FIG. It is the figure which showed the time of pushing in the movable cover of FIG. The structure of Embodiment 2 of the waterproof acoustic structure to which this invention is applied is shown, and it is the perspective view which showed the assembly | attachment state of the waterproof microphone part of FIG. 1 with the longitudinal cross-section. It is the perspective view which showed the movable cover and its periphery from the arrow X direction of FIG. It is the longitudinal cross-sectional view which showed the upper half part of the waterproof microphone part of FIG. It is the figure which showed the time of pushing in the movable cover of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Waterproof housing | casing 2 Waterproof display part 3 Waterproof operation part 4 Waterproof receiver part 5 Waterproof microphone part 6 Waterproof connector part 11 Lower housing | casing 12 Upper housing | casing 13 Lower case 14 Upper case 41 Opening part 42 Drainage channel 43 Drainage channel 44 Drainage port 51 Substrate 52 Sound Processing Unit 53 Backup Member 531 Opening Portion 532 Protruding Portion 533 Passage 54 Secondary Diaphragm 55 Elastic Holding Member 552 Protruding Portion 56 Movable Cover 561 Opening Portion 563 Recessed Portion 563 Flange 57 Spring 58 Movable Cover 581 Opening Portion 582 Recessed Portion 583 Flange 584 Drainage channel

Claims (8)

A sound processing unit having a primary diaphragm for sound generation or sound collection;
A secondary diaphragm that is provided on the sound processing unit and is provided with waterproofing, and vibrates due to the sound processing unit or external sound;
A waterproof acoustic structure comprising: a movable cover which is on the secondary diaphragm and which can change a space formed between the secondary diaphragm and the action of an external force.   2. The waterproof sound according to claim 1, further comprising a drainage channel around the movable cover for discharging water that has entered the space between the movable diaphragm and the secondary diaphragm by pressing the movable cover. Construction.   The waterproof acoustic structure according to claim 2, wherein the drainage channel is formed between the movable cover and an upper case having an opening in which the movable cover is movably incorporated.   The waterproof acoustic structure according to any one of claims 1 to 3, wherein an opening is formed at a center of the movable cover. The movable cover is formed of an inelastic member,
The waterproof acoustic structure according to any one of claims 1 to 4, further comprising a spring that urges the movable cover in a direction away from the secondary diaphragm.   The waterproof acoustic structure according to claim 1, wherein the movable cover is formed of an elastic member and is disposed at a position spaced apart from the secondary diaphragm. A protrusion that holds the periphery of the secondary diaphragm, and includes a backup member for suppressing resonance of the secondary diaphragm;
The concave part corresponding to the protrusion around the secondary diaphragm held on the protrusion of the backup member is formed in the movable cover. The waterproof acoustic structure according to claim 1. An electronic device including a sound processing unit having a primary diaphragm for sound generation or sound collection,
An electronic apparatus comprising the waterproof acoustic structure according to any one of claims 1 to 7.

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