JP4201637B2 - Flat speaker and electronic device using the same - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a flat speaker and an electronic apparatus in which the flat speaker is arranged on the front surface of a display (50) such as a mobile phone or a notebook computer.
[0002]
[Prior art]
7 and 8 are known as planar speakers for use in mobile phones, notebook computers, and the like.
[0003]
This flat speaker is composed of a main part (10) that is exposed to the outside through an opening (41) of a main body of an electronic device (40) such as a mobile phone and a laptop computer, and a stepped portion at the periphery of the main part (10). A diaphragm (1) having an edge (11) projecting through (11a) and a case (53) which is housed in the edge (11) of the diaphragm and is appropriately placed in the case (53). A yoke (22) fixed by means, a magnet (21) provided in the yoke (22), a top plate (51) solidified on the top surface of the magnet (21), and a drive disposed in the magnetic gap A magnetic circuit (2) composed of a coil (20), and is configured by fixing one end of the drive coil (20) to the diaphragm (1) (for example, Utility Model Document 1). ).
[0004]
[Utility model document 1]
Utility Model Registration No. 3078022 (first page, FIGS. 1 to 3)
[0005]
[Problems to be solved by the invention]
Many of the diaphragms used in conventional general speakers have curved diaphragms for strength improvement. However, since the diaphragm used for the flat speaker having the above-described configuration is disposed on the front surface of the display (50) of the mobile phone or the notebook computer, the main part has a flat shape so that the image is not curved. ing. Therefore, there is a problem that the strength of the vicinity of the center of the main part is structurally weak. Moreover, in the speaker of patent document 1, since the said flat speaker is exposed from the main body of the said electronic device, there exists a problem that the said main part with weak intensity | strength is easy to be damaged by the external pressure and impact. In addition, if the diaphragm is made thicker to improve this, vibration due to the magnetic circuit becomes difficult to be transmitted, and there is a problem that sound quality and sound pressure are lowered.
[0006]
Therefore, in view of the above problems, the present invention provides a flat speaker and an electronic device using the same that improve the strength of the main part and improve the sound quality.
[0007]
[Means for Solving the Problems]
The present invention relates to a diaphragm (1) comprising a main part (10) having a transparent and flat shape and an edge part (11) located outside the main part (10), and an edge of the diaphragm (1). A drive coil (20) fixed to the section (11), a magnet (21) disposed at a fixed position with a predetermined gap from the drive coil (20), and a yoke to which the magnet (21) is attached (22)
The main part of the diaphragm (1) is formed thicker than the edge part (11).
[0008]
The main part (10) is characterized in that it is formed thicker than the edge part (11) by attaching a transparent and flat reinforcing plate (10a).
[0009]
By using the above means, the strength of the diaphragm can be improved without lowering the sound quality and sound pressure.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
The diaphragm (1) in the present invention includes a transparent and flat main portion (10) so that the display (50) of the electronic device (40) can be seen, and magnetic circuits provided at both ends of the main portion (10). (2) and the edge (11) to which it is attached.
[0011]
The main part (10) is formed to be thicker than the edge part (11), and the main part (10) of the diaphragm (1) is formed thick when the diaphragm (1) is formed. ) And the edge portion (11) having the same thickness, and a transparent and flat reinforcing plate (10a) attached to the main portion (10) with a double-sided tape, an adhesive or the like is used.
[0012]
The ratio of the thickness of the main part (10) to the edge part (11) is preferably 1.5: 1 to 3: 1. If the main part (10) is thinner than this range, the effect of improving the strength is not obtained so much, and the diaphragm becomes light and the sound quality is lowered. Further, if the main part (10) is thicker than this range, the sound pressure will be reduced. The diaphragm (1) is made of a material having high transparency. For example, polyethylene terephthalate (PET), polycarbonate (PC), polyethylene naphthalate (PEN), polyetherimide (PEI), or polyimide (PI). Etc. are formed.
[0013]
Moreover, in the diaphragm (1), the strength of the main part (10) decreases as the flat area increases. For this reason, the diaphragm (1) is formed in a convex shape in cross section, and provided with a step (11a) that provides a step on the edge (11), the flat area can be reduced, and the main part ( The strength of 10) can be improved. Furthermore, the space can be effectively utilized by disposing a display (50) such as a liquid crystal screen in the space formed by forming the diaphragm (1) to have a convex cross section.
[0014]
Further, by providing a diaphragm recess for positioning the drive coil (20) at the edge (11) of the diaphragm (1), productivity can be improved and displacement at the time of attachment can be prevented.
[0015]
Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
[0016]
(Example 1)
FIG. 1 shows a top view (a) and a cross-sectional view (B) of AA of the flat speaker in the embodiment. This flat speaker has a convex section and a diaphragm (1) consisting of a main part (10) and an edge part (11), and a magnetic circuit (2) arranged on the edge part (11) of the diaphragm (1). And a frame body (3) to which the edge (11) of the diaphragm (1) and the magnetic circuit (2) are attached, and a frame circuit board (30) electrically connected to an external circuit.
[0017]
A cross-sectional view of the diaphragm used in the speaker of Example 1 is shown in FIG. The diaphragm (1) is made of PET as a material, and a transparent and flat main part (10) and a peripheral edge of the main part (10) so that a display (50) such as an electronic device (40) can be seen. And an edge portion (11) to which a magnetic circuit (2) provided on the head is attached. The main part (10) has a thickness of 100 to 150 μm, the edge (11) has a thickness of 50 to 75 μm, and the edge (11) is fixed to the frame (3) with an adhesive. Is done.
[0018]
A cross-sectional view of the magnetic circuit (2) used in the speaker of Example 1 is shown in FIG. The magnetic circuit (2) includes a drive coil (20) in which a copper wire is formed in an elliptical shape so as to have a winding axis perpendicular to the diaphragm (1), and a predetermined gap in the drive coil (20). A rectangular magnet (21) arranged at a fixed position and a yoke (22) into which the magnet (21) is inserted, and the yoke (22) is a vibration provided on the frame (3). The drive coil (20) is disposed in the plate recess (11b), and is inserted into the frame recess (3a) provided at the edge (11) of the diaphragm (1) from the lower surface and fixed by an adhesive or the like. . The magnetic circuit (2) is disposed on the upper and lower sides and the left and right sides of the edge (11) of the diaphragm (1), and the magnetic circuit (2) of the frame (3) is not disposed. The part is provided with a sound emitting hole.
[0019]
Further, a frame circuit board (not shown) is attached to the back surface of the frame body (3), and the lead wires drawn from the drive coil (20) are electrically connected to the frame circuit board.
[0020]
(Embodiment 2) FIG. 4 shows a cross-sectional view of a flat speaker according to Embodiment 2. In FIG. In this flat speaker, the diaphragm (1) is made of PET, and the main part (10) and the edge part (11) are formed to have a thickness of 75 μm. On the upper surface of the main part (10), A flat speaker was produced in the same manner as in Example 1 except that a 50 μm thick reinforcing plate (10a) made of PET was attached with a double-sided tape (15).
[0021]
In the flat speaker of the above embodiment, the main part (10) of the diaphragm (1) is made thicker than the edge (11), thereby forming a flat shape, thereby reducing the strength of the main part. The strength of the part (10) can be reinforced and the sound quality can be improved.
[0022]
FIG. 5 is a cross-sectional view of the planar speaker of the present invention attached to an electronic device. By forming the diaphragm (1) to have a convex cross section, the strength of the diaphragm (1) is improved compared to the flat shape of the entire surface and the convex shape of the cross section can be achieved. The display (50) of the electronic device (40) can be arranged in the space, and the electronic device can be miniaturized by effectively using the space. Further, by providing the diaphragm recess (11b) at the edge (11) of the diaphragm (1), the positioning of the drive coil (20) is facilitated, leading to an improvement in productivity.
[0023]
In the embodiment, the diaphragm (1) is formed in a convex shape in section, and the edge (11) has a step (11a) for providing a step, but the main part (10) is used. If it is transparent and flat, the shape of the edge (11) is not particularly limited, and the same effect can be obtained. Further, the number and arrangement of the magnetic circuits (2) are not particularly limited. For example, even when the magnetic circuit (2) formed in a circular shape or the like is formed at each corner as shown in FIG. Can be obtained.
[0024]
As the reinforcing plate (10a) used in Example 2, as in the diaphragm (1), polyethylene terephthalate (PET), polycarbonate (PC), polyethylene naphthalate (PEN), polyetherimide (PEI), or A material such as polyimide (PI) is used.
[0025]
【The invention's effect】
The present invention provides a diaphragm (1) comprising a main part (10) having a transparent and flat shape and an edge part (11) located at the periphery of the main part (10), and an edge of the diaphragm (1). A drive coil (20) fixed to the section (11), a magnet (21) disposed at a fixed position with a predetermined gap from the drive coil (20), and a yoke to which the magnet (21) is attached (22)
There can be provided the diaphragm (1) in which the strength of the main part (10) is improved without lowering the sound quality and the sound pressure, and the flat speaker using the diaphragm (1).
[Brief description of the drawings]
FIG. 1A is a top view of a flat speaker according to a first embodiment of the present invention, and FIG.
2 is a cross-sectional view of a diaphragm used in the flat speaker according to Embodiment 1. FIG.
FIG. 3 is a cross-sectional view of a porcelain circuit used in the flat speaker according to the first embodiment.
4 is a cross-sectional view of a diaphragm used in the planar speaker of Example 2. FIG.
FIG. 5 is a top view of a flat speaker according to another embodiment.
FIG. 6 is a cross-sectional view of an electronic apparatus to which the planar speaker of the present invention is attached.
FIG. 7 is a cross-sectional view of an electronic apparatus equipped with a conventional flat speaker.
FIG. 8 is a cross-sectional view of a magnetic circuit used in a conventional flat speaker.
[Explanation of symbols]
(1) Diaphragm
(10) Main part
(10a) Reinforcing plate
(11) Edge
(11a) Step
(11b) Diaphragm recess
(15) Double-sided tape
(2) Magnetic circuit
(20) Drive coil
(21) Magnet
(22) York
(3) Frame
(3a) Recessed frame
(3b) Sound vent
(30) Frame circuit board
(40) Electronic equipment
(41) Opening
(50) Display (50)
(51) Top plate
(53) Case

Claims (8)

A diaphragm (1) comprising a main part (10) having a transparent and flat shape and an edge part (11) located at the periphery of the main part (10), and an edge part (11) of the diaphragm (1) A drive coil (20) fixed to the magnet, a magnet (21) arranged at a fixed position with a predetermined gap from the drive coil (20), and a yoke (22) to which the magnet (21) is attached In a flat speaker comprising
The flat speaker, wherein the main part of the diaphragm (1) is formed thicker than the edge part (11). The plane according to claim 1, wherein the main part (10) is formed thicker than the edge part (11) by attaching a transparent and flat reinforcing plate (10a). Speaker. The flat speaker according to claim 1 or 2, wherein the diaphragm (1) is made of any one of polyethylene terephthalate, polycarbonate, polyethylene naphthalate, polyetherimide, or polyimide. 4. The flat speaker according to claim 1, wherein a ratio of thicknesses of the main part (10) and the edge part (11) is 1.5: 1 to 3: 1. The said diaphragm (1) is formed in the cross-sectional convex shape, The said edge (11) has the step part (11a) which provides a level | step difference, The Claim 1 thru | or 4 characterized by the above-mentioned. Flat speaker. The flat speaker according to any one of claims 1 to 5, wherein a concave portion for positioning the drive coil (20) is provided at an edge (11) of the diaphragm (1). An apparatus main body, and a display (50) arranged at a predetermined position of the apparatus main body for visually displaying information, wherein the speaker according to claim 1 to 6 is arranged on the front surface of the display (50). An electronic device characterized by being made. The electronic device according to claim 7, wherein the display (50) of the electronic device is arranged in a space formed by forming the diaphragm (1) to have a convex cross section.

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