JP4302015B2 - Diaphragm assembly and speaker-integrated image display apparatus having the same - Google Patents

Description

  The present invention relates to a diaphragm assembly that is a constituent element of a speaker unit disposed so as to cover a display screen of an image display, a speaker-integrated image display device including the diaphragm assembly, and a mobile phone including the display device And electronic devices such as digital cameras.

As shown in FIG. 15, a conventional speaker-integrated image display device has an image display (5) provided at the center of a frame (10), and a transparent vibration disposed so as to cover the image display (5). It comprises a plate (6) and a drive unit (4) disposed on the outer periphery of the diaphragm (6), and passes through the diaphragm (6) from an opening (14) provided on the upper surface of the frame (10). The image of the image display (5) can be visually recognized, and the diaphragm (6) vibrates by supplying a drive current to the drive unit (4) to generate sound (see Patent Document 1). .
Utility Model Registration No. 3078022

FIG. 12 shows a speaker-integrated image display device (not disclosed) proposed by the patent applicant. The frame (1a) is provided with a rectangular concave surface (12), and an image display (5) and a diaphragm (6) are disposed in the concave surface (12). The upper surface of the frame (1a) and the central part (65) of the diaphragm (6) are located on substantially the same plane, the outer peripheral part (61) of the diaphragm (6) is curved, and the outer peripheral edge is the frame ( It abuts on the outer peripheral part of the concave surface (12) of 1a) and is attached to the outer peripheral part with an adhesive. On the frame (1a), a driving device (4) for vibrating the diaphragm (6) is disposed opposite to the outer peripheral portion (61) of the diaphragm (6).
The diaphragm (6) satisfies the speaker characteristics required for a diaphragm used in a general speaker unit, and the image of the image display (5) is visually perceived through the diaphragm (6). It is also necessary to satisfy the optical characteristics. Therefore, the material constituting the diaphragm (6) needs to be a flexible material having a high light transmittance, and a film-like transparent resin is used.
Further, in order to improve the bass characteristic particularly in the speaker characteristics, it is necessary to make the thickness t1 of the outer peripheral part (61) of the diaphragm (6) as thin as possible as shown in FIG. The thickness t2 of 65) needs to be a certain thickness or more in order to maintain the strength of the diaphragm.

  The above-described diaphragm (6) can be manufactured by rolling and thinning the outer peripheral portion of a transparent resin film having a uniform thickness equal to the thickness t2 of the central portion (65). However, in this manufacturing method, it is difficult to make the thickness of the outer peripheral portion (61) less than half the thickness of the central portion (65). there were. Further, since the thickness of the outer peripheral portion (61) varies, there is a problem that the speaker characteristics of the diaphragm (6) are not stable, and the sound quality and pressure are not stable. Furthermore, other molding methods such as injection molding have problems such as processing accuracy and yield reduction, and it has been difficult to produce the above-described diaphragm (6) by integral molding.

  In order to solve this problem, as shown in FIG. 14, the patent applicant further integrally molded a diaphragm (6) having a uniform thickness t1, and transparently formed on the surface of the central portion (65) of the diaphragm (6). A diaphragm assembly (69) is proposed in which a reinforcing plate (67) is fixed by an adhesive layer (66). According to the diaphragm assembly (69), the thickness of the central portion (65) can be set to an arbitrary size depending on the thickness of the reinforcing plate (67). However, the central portion (65) of the diaphragm assembly (69) has a laminated structure of the diaphragm (6), the adhesive layer (66), and the reinforcing plate (67). There has been a problem that the image quality of the image display (5) viewed through the central portion (65) is deteriorated due to a decrease in transmittance.

  SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a diaphragm assembly, a speaker-integrated image display apparatus including the diaphragm assembly, and an electronic device including the display apparatus. Is to keep the quality of the image being played.

  A diaphragm assembly, which is a component of a speaker unit to be placed over the display screen of the image display device (5) according to the present invention, has an outer periphery having an opening (26) having a shape corresponding to the display screen at the center. Consists of a diaphragm (20) and a transparent central diaphragm (30) that is fixed by overlapping the outer diaphragm (20) by closing the opening (26) of the outer diaphragm (20). The central diaphragm (30) vibrates due to elastic deformation of the diaphragm (20).

According to the diaphragm assembly of the present invention, an opening having a shape corresponding to the display screen of the image display (5) is provided at the center of the outer peripheral diaphragm (20). The displayed image will be viewed only through the transparent central diaphragm (30). Accordingly, it is possible to prevent the light transmittance in the region from being lowered due to the outer peripheral diaphragm (20) and the central diaphragm (30) overlapping in the region corresponding to the display screen of the image display (5). The central diaphragm (30) can satisfy the required optical characteristics by selecting an optimal optical synthetic resin. On the other hand, since the light transmittance of the outer peripheral diaphragm (20) does not affect the image quality, an optimum material can be selected to further improve the speaker characteristics.
Furthermore, since the central diaphragm (30) and the outer peripheral diaphragm (20) of the diaphragm assembly (2) are configured separately, the central diaphragm (30) and the outer peripheral diaphragm (20) are respectively provided. It can be formed to a suitable thickness, whereby the bass characteristics of the diaphragm assembly (2) can be improved while maintaining the strength of the diaphragm assembly (2) at a required magnitude.

In a specific configuration, the outer peripheral diaphragm (20) and the central diaphragm (30) are each integrally molded products of synthetic resin.
According to the specific configuration, the central diaphragm (30) and the outer peripheral diaphragm (20) can be easily formed into a thin film shape, which makes it possible to reduce the weight.

In a specific configuration, the outer peripheral diaphragm (20) is formed thinner than the central diaphragm (30).
The outer peripheral diaphragm (20) is made of a synthetic resin having a smaller elastic coefficient than the synthetic resin forming the central diaphragm (30).

  According to the specific configuration, the diaphragm assembly (2) is composed of the outer peripheral diaphragm (20) that is flexible and easily elastically deformed, and the central diaphragm (30) having high rigidity. The bass characteristic of the diaphragm assembly (2) can be improved while maintaining the strength of 2) at a required level.

  In a more specific configuration, the outer peripheral diaphragm (20) has an annular flat portion (25) for fixing the outer peripheral portion of the central diaphragm (30) along the inner peripheral edge of the opening (26). ) And an annular inclined wall portion (24) surrounding the flat portion (25) and contacting the outer peripheral edge of the central diaphragm (30).

  According to the specific configuration, the central diaphragm (30) is guided by the inclined surface of the inclined wall part (24) whose outer peripheral edge is inclined toward the flat part (25) of the outer peripheral diaphragm (20). Then, it is positioned on the flat portion (25) of the outer peripheral diaphragm (20). Here, since the flat portion (25) of the outer peripheral diaphragm (20) is formed along the inner peripheral edge of the opening (26), the central diaphragm (30) is accurately positioned at the position where the opening (26) is blocked. Can be fixed.

  Furthermore, in the speaker-integrated image display device according to the present invention, the speaker unit (3) is disposed so as to cover the display screen of the image display (5), and the speaker unit (3) has a flat frame ( 1), a diaphragm assembly (2) and a drive device (4) for vibrating the diaphragm assembly (2) are arranged, and the diaphragm assembly (2) is arranged at the central portion. The outer peripheral diaphragm (20) having an opening (26) having a shape corresponding to the display screen, and the outer peripheral diaphragm (20) was closed and fixed on the outer peripheral diaphragm (20) by closing the opening (26). The outer peripheral portion (21) of the outer peripheral diaphragm (20) is fixed to the frame (1), and the outer peripheral diaphragm (20) is elastically deformed to deform the central diaphragm. (30) vibrates.

According to the speaker-integrated image display device (7) of the present invention, an opening having a shape corresponding to the display screen of the image display (5) is provided at the center of the outer peripheral diaphragm (20). The image displayed on the display (5) will be viewed only through the transparent central diaphragm (30). Accordingly, it is possible to prevent the light transmittance in the region from being lowered due to the outer peripheral diaphragm (20) and the central diaphragm (30) overlapping in the region corresponding to the display screen of the image display (5). The central diaphragm (30) can satisfy the required optical characteristics by selecting an optimal optical synthetic resin. On the other hand, since the light transmittance of the outer peripheral diaphragm (20) does not affect the image quality, an optimum material can be selected to further improve the speaker characteristics.
Furthermore, since the central diaphragm (30) and the outer peripheral diaphragm (20) of the diaphragm assembly (2) are configured separately, the central diaphragm (30) and the outer peripheral diaphragm (20) are respectively provided. It can be formed to a suitable thickness, whereby the bass characteristics of the diaphragm assembly (2) can be improved while maintaining the strength of the diaphragm assembly (2) at a required magnitude.

  In a specific configuration, the drive device (4) includes a coil (41) fixed to the outer peripheral diaphragm (20) of the diaphragm assembly (2), and the frame (41) facing the coil (41). 1) and a magnetic generator (40) arranged in 1).

  According to this specific configuration, the coil (41) and the magnetism generator (40) are disposed at positions away from the central diaphragm (30) of the diaphragm assembly (2). The magnetism generator (40) does not cover the display area of the image display (5) exposed from the opening (26) of the central diaphragm (30).

  Furthermore, the electronic apparatus according to the present invention includes a speaker-integrated image display device in which a speaker unit (3) is disposed so as to cover the display screen of the image display (5), and the speaker unit (3) is flat. A diaphragm assembly (2) and a drive device (4) for vibrating the diaphragm assembly (2) are arranged inside the frame (1), and the diaphragm assembly (2) has a central portion. The outer peripheral diaphragm (20) having an opening (26) having a shape corresponding to the display screen and the opening (26) of the outer peripheral diaphragm (20) are closed and overlapped with the outer peripheral diaphragm (20) and fixed. The outer peripheral part (21) of the outer peripheral diaphragm (20) is fixed to the frame (1) and is elastically deformed by the outer peripheral diaphragm (20). The diaphragm (30) vibrates.

According to the electronic apparatus of the present invention, an opening having a shape corresponding to the display screen of the image display (5) is provided at the center of the outer peripheral diaphragm (20). The resulting image will be visible only through the transparent central diaphragm (30). Accordingly, it is possible to prevent the light transmittance in the region from being lowered due to the outer diaphragm (20) and the central diaphragm (30) overlapping in the region corresponding to the display screen of the image display (5). The central diaphragm (30) can satisfy the required optical characteristics by selecting an optimal optical synthetic resin. On the other hand, since the light transmittance of the outer peripheral diaphragm (20) does not affect the image quality, an optimum material can be selected to further improve the speaker characteristics.
Furthermore, since the central diaphragm (30) and the outer peripheral diaphragm (20) of the diaphragm assembly (2) are configured separately, the central diaphragm (30) and the outer peripheral diaphragm (20) are respectively provided. It can be formed to a suitable thickness, whereby the bass characteristics of the diaphragm assembly (2) can be improved while maintaining the strength of the diaphragm assembly (2) at a required magnitude.

  According to the diaphragm assembly, the speaker-integrated image display device including the diaphragm assembly, and the electronic device including the display device, the display screen of the image display (5) is optimized. Since only the transparent central diaphragm (30) having optical characteristics is viewed, the influence on the image quality due to the presence of the diaphragm assembly (2) can be minimized. Further, since the central diaphragm (30) and the outer peripheral diaphragm (20) of the diaphragm assembly (2) are separately formed, the strength of the diaphragm assembly (2) is maintained at a necessary size. The bass characteristic of the diaphragm assembly (2) can be improved.

Hereinafter, embodiments of the present invention will be specifically described with reference to the drawings.
FIG. 1 shows a mobile phone equipped with a speaker-integrated image display device (7) according to the present invention. In the cellular phone, the speaker-integrated image display device (7) is provided in a lid cabinet (8), and the lid cabinet (8) is a main body cabinet having a plurality of operation buttons (80) ( 82) via a hinge (81), and sound and images are output from the speaker-integrated image display device (7).
FIG. 2 shows a PDA (personal digital assistant: portable information terminal) equipped with a speaker-integrated image display device (7) according to the present invention. In the PDA, a plurality of operation buttons (80) are provided on the surface of a cabinet (8) provided with a speaker-integrated image display device (7), and audio and images distributed from the accessed website are speaker-integrated. Output from the image display device (7).

As shown in FIGS. 3 and 5, the speaker-integrated image display device (7) includes a flat frame (1), and an image display (5) comprising a rectangular liquid crystal panel is provided in the frame (1). ) And a speaker unit (3). The speaker unit (3) includes a diaphragm assembly (2) and a pair of driving devices (4) and (4) that vibrate the diaphragm assembly (2).
The diaphragm assembly (2) has a peripheral edge fixed to the frame (1) and is disposed so as to cover the image display (5). In the frame (1), the pair of driving devices (4) and (4) are arranged opposite to the diaphragm assembly (2) with the image display (5) sandwiched outside the image display (5). Has been.
In this example, two drive devices (4) are provided. However, as shown in FIG. 4, four drive devices (4) may be provided to face each edge of the image display (5).

As shown in FIG. 6, each driving device (4) includes a coil (41) wound in a rectangular shape, and a magnetic generator (40) provided on the frame (1) so as to face the coil (41). It consists of. The magnetism generator (40) includes a magnet (42), a pole piece (44) disposed on the magnet (42), and a yoke (43) having a U-shaped cross section connected to the magnet (42). Consists of The coil (41) is fixed to a convex portion (23) provided on the outer peripheral diaphragm (20) of the diaphragm assembly (2), and is disposed in a gap portion between the pole piece (44) and the yoke (43). Deployed.
In the drive device (4), the magnetic lines of force generated from the magnet (42) extend in a loop along the magnetic path formed by the pole piece (44) and the yoke (43), and cross the coil (41). . As a result, a driving force acts on the coil (41), and the diaphragm assembly (2) is driven.

As shown in FIGS. 7 and 8, the diaphragm assembly (2) includes an outer peripheral diaphragm (20) and a central diaphragm (30) which are integrally molded products of synthetic resin.
The outer peripheral diaphragm (20) has an opening (26) in the center, and surrounds the flat portion (25) and an annular flat portion (25) formed along the inner peripheral edge of the opening (26). A convex portion (23) to which the coil (41) is fixed as described above is formed in a portion facing the magnetism generating portion (40). Yes.
The opening (26) of the outer peripheral diaphragm (20) is formed to be the same as or slightly wider than the display area of the image display (5), and the image displayed on the image display (5) is Visualized through the opening (26) and the central diaphragm (30) described below. Therefore, the outer peripheral diaphragm (20) does not have to be transparent, and the outer peripheral diaphragm (20) is made of an inexpensive and reliable synthetic resin material used for a diaphragm of a general speaker unit, for example, polyether. Imide (PEI), polyethylene naphthalate (PEN), and the like can be employed. The thickness of the outer peripheral diaphragm (20) is preferably 20 to 50 μm.

  On the other hand, the central diaphragm (30) is formed of a transparent optical synthetic resin material such as polycarbonate (PC) or polyethersulfone (PES), and has a flat plate shape. Moreover, it is possible to suppress reflection of light on the surface of the central diaphragm (30) by subjecting the surface of the central diaphragm (30) to a surface treatment such as an AR (anti-reflection) coating. The thickness of the central diaphragm (30) is preferably 100 μm or more.

  Furthermore, the outer peripheral diaphragm (20) and the central diaphragm (30) are adhesive or the like in a state where the peripheral portion of the central diaphragm (30) and the flat portion (25) of the outer peripheral diaphragm (20) are overlapped with each other. Are fixed to form an integral diaphragm assembly (2).

9 to 11 show various configuration examples of the diaphragm assembly (2), respectively.
In the diaphragm assembly (2) shown in FIGS. 9 (a) and 9 (b), a flat portion (25) is formed along the inner peripheral edge of the opening (26) of the outer peripheral diaphragm (20). A bent portion (24) having an arcuate cross section is formed surrounding the portion (25). The central diaphragm (30) is positioned on the flat portion (25) by guiding the outer peripheral edge thereof to the inclined surface of the bent portion (24). Therefore, the central diaphragm (30) can be easily and accurately fixed at a position that closes the opening (26) of the outer peripheral diaphragm (20).

  Further, in the diaphragm assembly (2) shown in FIGS. 10 (a) and 10 (b), a flat portion (25) is formed along the inner peripheral edge of the opening (26) of the outer peripheral diaphragm (20), and An annular inclined wall portion (24) is formed surrounding the flat portion (25). On the other hand, a bent portion (32) corresponding to the slope of the inclined wall portion (24) is formed on the outer peripheral edge of the central diaphragm (30). The bent part (32) of the central diaphragm (30) is guided by the inclined wall part (24) of the outer peripheral diaphragm (20), and the central diaphragm (30) is a flat part (25) of the outer peripheral diaphragm (20). Positioned above. Therefore, the central diaphragm (30) can be easily and accurately fixed at a position that closes the opening (26) of the outer peripheral diaphragm (20).

  Furthermore, in the diaphragm assembly (2) shown in FIGS. 11 (a) and 11 (b), a flat portion (25) is formed along the inner peripheral edge of the opening (26) of the outer peripheral diaphragm (20), and An annular inclined wall portion (24) is formed surrounding the flat portion (25). The central diaphragm (30) is positioned on the flat part (25) from the back side of the outer peripheral diaphragm (20), with the outer peripheral edge thereof guided by the inclined wall part (24). Therefore, the central diaphragm (30) can be easily and accurately fixed at a position that closes the opening (26) of the outer peripheral diaphragm (20).

In the mobile phone or PDA of the present invention, the diaphragm assembly (2) includes an outer peripheral diaphragm (20) having an opening (26) having a shape corresponding to the display screen of the image display (5) at the center, An image display (5) is composed of a transparent central diaphragm (30) fixed by being overlapped on the outer diaphragm (20) by closing the opening (26) of the outer diaphragm (20). The image displayed on the screen is viewed only through the transparent central diaphragm (30). Accordingly, it is possible to prevent the light transmittance in the region from being lowered due to the outer peripheral diaphragm (20) and the central diaphragm (30) overlapping in the region corresponding to the display screen of the image display (5). The central diaphragm (30) can satisfy the required optical characteristics by selecting an optimal optical synthetic resin. On the other hand, since the light transmittance of the outer peripheral diaphragm (20) does not affect the image quality, an optimum material can be selected to further improve the speaker characteristics.
Furthermore, since the central diaphragm (30) and the outer peripheral diaphragm (20) of the diaphragm assembly (2) are configured separately, the central diaphragm (30) and the outer peripheral diaphragm (20) are respectively provided. It can be formed to a suitable thickness, whereby the bass characteristics of the diaphragm assembly (2) can be improved while maintaining the strength of the diaphragm assembly (2) at a required magnitude.

In addition, each part structure of this invention is not restricted to said embodiment, A various deformation | transformation is possible within the technical scope as described in a claim. For example, although the shape of the central diaphragm (30) is rectangular, various shapes can be adopted according to the shape of the display area of the image display (5).
Moreover, although the liquid crystal panel was illustrated as an image display (5), an organic EL display and an inorganic EL display may be sufficient.
Furthermore, although the use of the speaker-integrated image display device for a mobile phone or PDA has been exemplified, it may be used for a digital camera or digital video.

1 is a perspective view of a mobile phone equipped with a speaker-integrated image display device according to the present invention. 1 is a perspective view of a PDA including a speaker-integrated image display device according to the present invention. 1 is a front view of a speaker integrated image display device according to the present invention. It is a front view which shows the other structural example of the speaker integrated image display apparatus which concerns on this invention. It is sectional drawing of the speaker integrated image display apparatus which follows the AA line of FIG. It is an expanded sectional view which shows the principal part of FIG. FIG. 4 is a cross-sectional view of the diaphragm assembly taken along line AA in FIG. 3. It is sectional drawing of the diaphragm assembly which follows the BB line of FIG. It is sectional drawing which shows the structural example of a diaphragm assembly. It is sectional drawing which shows the other structural example of a diaphragm assembly. It is sectional drawing which shows the further another structural example of a diaphragm assembly. 1 is a cross-sectional view of a speaker-integrated image display device for which a patent application is pending. It is a principal part expanded sectional view of the diaphragm in the speaker integrated image display device of a patent application. It is a principal part expanded sectional view of the diaphragm assembly in the speaker integrated image display device of a patent application. It is sectional drawing which shows the conventional speaker integrated image display apparatus.

Explanation of symbols

(1) Frame
(2) Diaphragm assembly
(20) Perimeter diaphragm
(24) Inclined wall
(25) Flat part
(26) Opening
(3) Speaker unit
(30) Central diaphragm
(4) Drive device
(40) Magnetic generator
(41) Coil
(42) Magnet
(43) York
(44) Pole piece
(5) Image display
(6) Diaphragm
(7) Speaker integrated display

Claims (9)

  A diaphragm assembly serving as a component of a speaker unit to be disposed over the display screen of the image display device, and an outer peripheral diaphragm (20) having an opening (26) having a shape corresponding to the display screen at the center And a transparent central diaphragm (30) fixed by being overlapped with the outer diaphragm (20) by closing the opening (26) of the outer diaphragm (20), and the outer diaphragm (20) A diaphragm assembly, wherein the central diaphragm (30) vibrates due to elastic deformation of the diaphragm.   The diaphragm assembly according to claim 1, wherein each of the outer peripheral diaphragm (20) and the central diaphragm (30) is an integrally molded product of synthetic resin.   The diaphragm assembly according to claim 2, wherein the outer peripheral diaphragm (20) is formed thinner than the central diaphragm (30).   The diaphragm assembly according to claim 2 or 3, wherein the outer peripheral diaphragm (20) is formed of a synthetic resin having a smaller elastic coefficient than a synthetic resin forming the central diaphragm (30).   The outer peripheral diaphragm (20) is formed with an annular flat portion (25) for fixing the outer peripheral portion of the central diaphragm (30) along the inner peripheral edge of the opening (26), 5. The vibration according to claim 2, wherein an annular inclined wall portion (24) is formed surrounding the flat portion (25) and abutting the outer peripheral edge of the central diaphragm (30). Board assembly.   A diaphragm assembly (2) according to any one of claims 1 to 5 and a driving device (4) for vibrating the diaphragm assembly (2) are arranged inside the frame (1). A speaker unit configured.   A speaker-integrated image display device in which a speaker unit (3) is disposed so as to cover a display screen of an image display (5), wherein the speaker unit (3) is vibrated inside a flat frame (1). A plate assembly (2) and a drive device (4) for vibrating the diaphragm assembly (2) are arranged, and the diaphragm assembly (2) has a shape corresponding to the display screen at the center. An outer peripheral diaphragm (20) having an opening (26), and a transparent central diaphragm (30) which is fixed by overlapping the outer peripheral diaphragm (20) by closing the opening (26) of the outer peripheral diaphragm (20). ), The outer peripheral portion (21) of the outer peripheral diaphragm (20) is fixed to the frame (1), and the central diaphragm (30) vibrates due to elastic deformation of the outer peripheral diaphragm (20). A speaker-integrated image display device.   The drive device (4) is disposed on the frame (1) so as to face the coil (41) and the coil (41) fixed to the outer peripheral diaphragm (20) of the diaphragm assembly (2). The speaker-integrated image display device according to claim 7, comprising a magnetism generator (40).   An electronic apparatus including a speaker-integrated image display device in which a speaker unit (3) is disposed so as to cover a display screen of an image display (5), the speaker unit (3) having a flat frame (1) Is provided with a diaphragm assembly (2) and a drive device (4) for vibrating the diaphragm assembly (2), and the diaphragm assembly (2) has the display screen in the center. The outer peripheral diaphragm (20) having an opening (26) having a shape corresponding to the outer peripheral diaphragm (20), and the transparent diaphragm fixed to the outer peripheral diaphragm (20) by overlapping the outer peripheral diaphragm (20). The outer peripheral portion (21) of the outer peripheral diaphragm (20) is fixed to the frame (1), and the central diaphragm (30) is elastically deformed by the outer peripheral diaphragm (20). ) Vibrates.

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