JP4127184B2 - Speaker, speaker module and electronic device using the same - Google Patents

Description

  The present invention relates to a speaker, a speaker module, and an electronic device such as a mobile phone or a game device using the speaker module, which are used in various acoustic devices and information communication devices.

  The prior art will be described with reference to FIG. FIG. 4 is a cross-sectional view of a conventional speaker. As shown in FIG. 4, a magnetized magnet 1 is sandwiched between an upper plate 2 and a yoke 3 to form an internal magnet type magnetic circuit 4, and a frame 6 is coupled to the yoke 3 of the magnetic circuit 4. A first diaphragm 7 is attached to the peripheral edge of the frame 6, and a voice coil 8 is coupled to the first diaphragm 7 and is coupled so as to fit into the magnetic gap 5 of the magnetic circuit 4. ing.

  Further, a panel 9 is coupled to the peripheral edge of the frame 6, and a substantially planar second diaphragm 10 is coupled to the panel 9 with an adhesive 12, and the first diaphragm 7 and the second diaphragm 10 are coupled. A speaker 13 is configured by acoustically coupling between the two by a sealed space 11.

For example, Patent Document 1 is known as prior art document information relating to the invention of this application.
JP 2003-179988 A

  The above-mentioned speaker is an acoustic coupling type speaker configured by having two diaphragms and coupling between them in a sealed space. Therefore, in order to ensure the acoustic characteristics of the acoustic coupling type speaker 13, it can be realized by ensuring the airtightness of the sealed space 11 between the two diaphragms.

  However, due to variations in production such as the application amount and the application position of the adhesive 12, the airtightness of the sealed space 11 cannot be ensured completely, and air leakage may occur.

  In addition, when a solvent-based adhesive is used, due to the lot-to-lot variation in the ratio of the solvent and the solid content of the adhesive 12, when the solid content remaining when the adhesive 12 is dry-cured is small, Air leakage may occur from the gap generated by the adhesive 12 being thinned, and the airtightness of the sealed space 11 may not be ensured.

  In these cases, the airtightness of the sealed space 11 cannot be ensured due to air leakage, and the acoustic coupling state of the two diaphragms is lowered to deteriorate the acoustic characteristics. Therefore, there has been a problem that acoustic characteristic defects occur and the characteristics vary greatly depending on the production lot of speakers.

  An object of the present invention is to solve the above-mentioned problems and to provide an excellent speaker capable of realizing good acoustic characteristics by ensuring the airtightness of a sealed space.

  In order to achieve the above object, the present invention has the following configuration.

According to the first aspect of the present invention, there is provided a frame coupled to a magnetic circuit, a first diaphragm coupled to an outer peripheral portion of the frame, coupled to the first diaphragm, A voice coil partially fitted in a magnetic gap of a magnetic circuit, a panel is coupled to the frame, a sealed space is provided, and a second diaphragm is coupled to the panel, whereby the first diaphragm and the second diaphragm a vibration plate an acoustic bound speaker, coupling at least the base of the panel and the second diaphragm, coupled to the coupling member consisting of a pressure-sensitive adhesive provided on both surfaces of the substrate structure and, while securing a clearance of the enclosed space by the substrate, by the adhesive, but with improved airtightness of the sealed space. With this configuration, the effect of the pressure-sensitive adhesive having a high production method accuracy and a solid content of almost 100% prevents air leakage and improves airtightness. By securing the airtightness, a speaker having good acoustic characteristics can be realized.

In addition , since the substrate includes not only the pressure-sensitive adhesive, the clearance of the sealed space can be arbitrarily ensured, and the characteristics of the acoustic coupling type speaker can be optimized.

In the invention according to claim 2 of the present invention, the base material of the bonded body is composed of a film material. With this configuration, by using a film material with high material thickness accuracy for the base material, the clearance of the sealed space can be ensured with high accuracy, and the characteristics of the acoustic coupling type speaker can be stabilized.

In the invention according to claim 3 of the present invention, the base film material of the bonded body is composed of polyethylene terephthalate (PET). With this configuration, the gap between the panel and the second diaphragm can be stably configured in terms of temperature characteristics, and an acoustic coupling type speaker having stable characteristics that are not affected by the ambient temperature can be realized.

The invention according to claim 4 of the present invention is constructed by using a double-sided tape for the bonded body. With this configuration, the material cost and the production cost can be reduced, and the cost of the acoustic coupling type speaker can be reduced.

According to a fifth aspect of the present invention, the first diaphragm is configured to be smaller than the second diaphragm. With this configuration, it is possible to further reduce the size of the speaker and the speaker module and electronic device using the speaker and improve the degree of design freedom.

According to a sixth aspect of the present invention, the second diaphragm is constituted by a sheet-like transparent film. With this configuration, even if a display object is placed under the second diaphragm, it can be visually recognized through a transparent film. Modules and electronic devices using this speaker can be further reduced in thickness, size, and design flexibility. Improvements can be realized.

The invention according to claim 7 of the present invention, which is constituted by a transparent material panel. With this configuration, even if a display object is arranged under the panel, it can be visually recognized through the second diaphragm made of a transparent film and the transparent panel. Further thinning, downsizing, and improvement in design flexibility can be realized.

In the invention according to claim 8 of the present invention, the adhesive of the bonded body is made of a transparent material. With this configuration, even if the display object is disposed under the second diaphragm or the combined body of the panels, the display object is visually recognized through the second diaphragm made of a transparent film, the transparent panel, and the transparent adhesive. Therefore, it is possible to realize further thinning, downsizing, and improvement in design flexibility of modules and electronic devices using the speaker.

According to the ninth aspect of the present invention, the base material of the bonded body is made of a transparent material. With this configuration, even if the display object is arranged under the second diaphragm or the combined body of the panels, the second diaphragm made of a transparent film, the transparent panel, the transparent adhesive, and the transparent substrate The module and electronic equipment using the speaker can be further reduced in thickness, reduced in size, and improved in design freedom.

The invention according to claim 10 of the present invention is a speaker module covering the front surface of the display unit in the second diaphragm of the speaker according to any one of claims 1 to 9. With this configuration, the display unit and the speaker can be reduced in thickness and size and configured as an integrated module.

According to an eleventh aspect of the present invention, an electronic apparatus includes the module according to the tenth aspect and an operation unit. With this configuration, the electronic device can be reduced in thickness and size.

  As described above, according to the present invention, the first diaphragm, the second diaphragm, and the panel are coupled to the panel that supports the second diaphragm and the second diaphragm by the combination having at least an adhesive. The space constituted by and is surely sealed to improve the airtightness. With this configuration, air leakage from the gap between the panel supporting the second diaphragm and the second diaphragm is prevented, and the airtightness of the sealed space is improved. A combined type speaker can be realized.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

(Embodiment 1)
Hereinafter, with reference to the first embodiment will be described for the invention of claim 9, especially from claim 1 of the present invention.

  FIG. 1 is a cross-sectional view of a speaker according to an embodiment of the present invention. As shown in FIG. 1, a magnetized magnet 21 is sandwiched between an upper plate 22 and a yoke 23 to form an internal magnet type magnetic circuit 24, and a frame 26 is coupled to the yoke 23 of the magnetic circuit 24. The outer periphery of the first diaphragm 27 is bonded to the peripheral edge of the frame 26, and one end of the voice coil 28 is coupled to the first diaphragm 27, and the opposite end is connected to the magnetic gap 25 of the magnetic circuit 24. It is combined and configured so as to fit in.

  Further, the frame 29 is coupled to the panel 29, and the substantially planar second diaphragm 30 is coupled to the panel 29 via the sealed space 31, whereby the first diaphragm 27 and the second diaphragm 30 are coupled. A speaker 40 is configured by acoustic coupling with the diaphragm 30.

  Here, when the substantially planar second diaphragm 30 is coupled to the panel 29 via the sealed space 31, the speaker 40 is coupled by a coupled body having at least an adhesive 32 as the coupling means. It is.

  In this embodiment, the bonded body is of a type constituted by a base material 33 and an adhesive 32, and this base material 33 is made of a film material of polyethylene terephthalate (PET).

  The first diaphragm 27 is configured to be smaller than the second diaphragm 30, and the second diaphragm 30, the panel 29, the adhesive 32, and the base material 33 are formed of a transparent material. With this configuration, the airtightness is improved by improving the airtightness by the effect of the pressure-sensitive adhesive having a high production method accuracy and a solid content of almost 100%, and the sealed space 31 having two diaphragms. By securing the airtightness of the speaker, a speaker with good acoustic characteristics can be realized.

  That is, it is possible to eliminate air leakage from the gaps caused by the solid content leaning due to solvent volatilization after drying and curing such as a solvent-based adhesive. Furthermore, by providing not only the adhesive 32 but also the base material 33 and adjusting the thickness of the base material 33 arbitrarily, the clearance of the sealed space 31 can be arbitrarily secured, and the characteristics of the acoustic coupling type speaker can be secured. Optimization and adjustment of acoustic characteristics can be achieved.

  Then, the base material 33 of the combined body is made of a film material made of polyethylene terephthalate (PET), so that the temperature characteristics are stabilized and the clearance of the sealed space 31 is ensured with high accuracy by the film material having high material thickness accuracy. Thus, the characteristics of the acoustic coupling type speaker can be stabilized.

  In addition, since the display object is arranged under the combined body of the second vibration plate and the panel by using the transparent material, the film, the second vibration plate, the panel, and the adhesive made of the transparent material are arranged. The module and electronic device using the speaker can be visually recognized through the agent and the base material, and further miniaturization, thickness reduction, and improvement in design freedom can be realized with improvement in sound pressure level.

  In addition, a double-sided tape can be used as the coupling body. In this case, if a commercially available double-sided tape is used, the material cost and production cost can be reduced, and the cost of the acoustic coupling type speaker can be reduced. Can be achieved.

  In this embodiment, the bonded body is composed of the base material 33 and the pressure-sensitive adhesive 32. However, the bonded body may be formed of only the pressure-sensitive adhesive 32.

(Embodiment 2)
The second aspect of the present invention will be described below with reference to the tenth aspect of the present invention.

  FIG. 2 is a cross-sectional view of the speaker module according to the embodiment of the present invention. FIG. 2 shows a speaker module including at least a display unit 41 and a speaker 40. The second diaphragm 30 of the speaker according to claim 1 is placed on the front surface of the display unit 41. 41 is a speaker module 50 arranged and mounted in a shape covering 41.

  At this time, the second diaphragm 30, the panel 29, the adhesive 32, and the base material 33 are also made of a transparent material. Thus, by setting the display unit 41 in the lower space of the second diaphragm 30 and modularizing it, the second diaphragm 30 and the adhesive and base material portions can be seen through.

  With this configuration, the acoustic coupling type speaker module can be reduced in size, thickness, and design freedom. Furthermore, by modularizing in this way, it is possible to reduce the process during set production and rationalize at the parts distribution stage, and it is possible to realize cost reduction.

  Here, the arrangement location of the display unit 41 of the module 50 may be directly under the transparent film sheet as the second diaphragm 30 or may be arranged under the transparent panel 29 as in this example. good.

(Embodiment 3)
Hereinafter, the invention described in claim 11 of the present invention will be described using the third embodiment.

  FIG. 3 is a cross-sectional view of a main part of a mobile phone device on which the speaker module according to one embodiment of the present invention is mounted. FIG. 3 shows a mobile phone device 51 including a speaker module 50 including at least a display unit 41 and a speaker 40 and an operation unit 42.

  The cellular phone device 51 is configured by using the speaker module 50 described in the second embodiment. The speaker module 50 is coupled to the outer case 52, and the operation unit 42 is coupled to the side of the speaker module 50. Is configured.

  With this configuration, as in the second embodiment, the display unit 41 is set in the lower space of the second diaphragm 30, the adhesive and the base material, and the operation unit 42 is set next to the display unit 41. Things can be seen through, and the mobile phone device 51 can be made smaller, thinner, and improved in design freedom.

  Further, although this embodiment has been described with reference to application to a mobile phone device, the present invention is not limited to this embodiment, and is not limited to this embodiment. Application to equipment can also be widely developed.

  The speaker and the speaker module according to the present invention can be provided with a display function to enable miniaturization by using a transparent film and a transparent panel in addition to the function of producing sound, and can emit sound from the display unit. It can be applied to audiovisual equipment, information communication equipment, game equipment and the like.

Sectional drawing of the speaker in one embodiment of this invention Sectional drawing of the speaker module in one embodiment of this invention Sectional drawing of the principal part of the electronic device in one embodiment of this invention Sectional view of a conventional acoustic coupling type speaker

Explanation of symbols

DESCRIPTION OF SYMBOLS 21 Magnet 22 Upper plate 23 Yoke 24 Magnetic circuit 25 Magnetic gap 26 Frame 27 1st diaphragm 28 Voice coil 29 Panel 30 2nd diaphragm 31 Sealed space 32 Adhesive 33 Base material 40 Speaker 41 Display part 42 Operation part 50 Speaker module 51 Mobile phone device 52 Exterior case

Claims (11)

A frame coupled to the magnetic circuit, a first diaphragm coupled to the outer periphery of the frame, and a first diaphragm coupled to the first diaphragm, and a part thereof being fitted into the magnetic gap of the magnetic circuit A voice coil, a panel coupled to the frame, and the first diaphragm are coupled, and at least a part thereof is coupled to the sealed space surrounded by the panel and the sealed space surrounded by the panel. A speaker comprising a second diaphragm, wherein the panel and the second diaphragm are coupled by a combined body comprising at least a base material and an adhesive provided on both surfaces of the base material. The speaker in which the clearance of the sealed space is secured by the base material and the airtightness of the sealed space is improved by the adhesive . The speaker according to claim 1, wherein the base material of the combined body is made of a film material. The speaker according to claim 1, wherein the base film material of the combined body is polyethylene terephthalate (PET). The speaker according to claim 1, wherein the combined body is a double-sided tape. The speaker according to claim 1, wherein the first diaphragm is smaller than the second diaphragm. The speaker according to claim 1, wherein the second diaphragm is made of a transparent film. The speaker according to claim 1, wherein the panel is made of a transparent material. The speaker according to claim 1, wherein the adhesive of the combined body is made of a transparent material. The speaker according to claim 1, wherein the base material of the combined body is made of a transparent material. The speaker module which covered the front surface of the display part with the 2nd diaphragm of the speaker as described in any one of Claims 1-9. An electronic device comprising the speaker module according to claim 10 and an operation unit.

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