The present invention relates to a speaker device and a method of manufacturing the speaker device.
The present application claims priority from Japanese Application No. 2004-158063, the disclosure of which is incorporated herein by reference.
A frame 6 consisting of a metal is mounted on the ring-shaped plate 5, forming a funnel-like structure including an annular flat portion 6A to which a perimeter edge portion of a damper D is bonded by virtue of an adhesive material S. Besides, an annular clearance 7 is formed between the center pole 2 and the inner circumferential wall of the plate 5, thus admitting a cylindrical voice coil bobbin 8 surrounding the center pole 2, as well as a voice coil 9 winding around the voice coil bobbin 8. An upper portion of the voice coil 9 winding around the voice coil bobbin 8 is fixed with the damper D, while a further higher portion thereof is fixed with a diaphragm 10, with the other end of the diaphragm 10 connected with the edge of the frame 6. In addition, a terminal 11 is disposed on the outside of the frame 6 and connected via a brocade thread 12 to a lead wire (not shown) extending from the voice coil 9, in a manner such that a sound signal obtained by the terminal 11 can be supplied to the voice coil 9 through the lead wire. Furthermore, a dust proof cap 13 is provided on the top of the voice coil bobbin 8.
However, the speaker device disclosed in Japanese Unexamined Patent Application Publication No. Hei 06-14383 has suffered from a problem that the damper D will be damaged due to an intense vibration or a high input, rendering it impossible to maintain a desired function. On the other hand, although the frame 6 and the damper D have been bonded together by virtue of the adhesive material S interposed therebetween, they would still be separated from each other due to an intense vibration.
Furthermore, with a trend of making a speaker device compact in size and thin in thickness, the small and thin speaker device 1 has been confronted with a problem that the lowest resonance frequency f0 will generally become relatively high, making it difficult to produce a low volume sound. This is because the speaker device 1, which as a whole has been made light in weight, has reduced an equivalent mass m0 of the vibration system of the speaker device.
The present invention has been accomplished to solve the above-mentioned problem as one of its task and it is an object of the present invention to increase the strength of the damper of a speaker device and to prevent an exfoliating of the damper from the frame.
To achieve the foregoing object, the speaker device of the present invention comprises at least the following features according to the following aspects.
According to one aspect of the present invention, there is provided a speaker device having a damper containing aramid fiber. In particular, a perimeter edge portion of the damper is clamped between a frame and a ring-shaped member arranged along the perimeter edge portion of the damper, thereby fixing the damper on the frame.
According to another aspect of the present invention, there is provided a method of manufacturing a speaker device formed by fixing a damper containing aramid fiber on a frame. In particular, a perimeter edge portion of the damper is clamped between the frame and a ring-shaped member arranged along the perimeter edge portion, thereby allowing the perimeter edge portion of the damper to be fixed on the frame.
These and other objects and advantages of the present invention will become clear from the following description with reference to the accompanying drawings, wherein:
In the following, an embodiment of the present invention will be described with reference to the accompanying drawings.
As shown, the present embodiment of the present invention comprises a damper 30 containing aramid fiber, with the perimeter edge portion thereof fixed on a frame 6 by clamping the same on the frame 6 using a ring-shaped member 42 attached along the perimeter edge portion of the damper 30. Here, the damper 30 and the frame 6 are fixed with each other by virtue of a fixing structure 40 provided on a flat portion 6A of the frame 6. Here, although the present embodiment of the present invention shows the fixation between the damper 30 and the flat portion 6A, the position for fixing the damper on the frame should not be limited to the flat portion.
Next, description will be given to explain a fixing method with reference to
Next, the ring-shaped member 42 is placed on the perimeter edge portion 30b of the damper 30 bonded with the adhesive material 41. In fact, the ring-shaped member 42 is in the form of an annular configuration along the perimeter edge portion 30b of the damper 30, and can be made of any desired material without any limitation. Moreover, the ring-shaped member 42 is formed with holes (not shown) in desired positions and the screws 43 are then screwed into these holes, thereby forming a firmly fixed structure between the damper 30 and the frame 6. Here, each screw 43 should be so formed that its sharpened end can pass through the perimeter edge portion 30b of the damper 30 and through the adhesive material 41, so as to reach the flat portion 6A of the frame 6, or even pass through the flat portion 6A.
Therefore, according to the above-described embodiment of the present invention, the adhesive material 41 is at first interposed between the flat portion 6 and the perimeter edge portion 30b of the damper 30. Then, the ring-shaped member 42 is placed on the perimeter edge portion 30b, and the screws 43 are driven down through the related material layers, thereby obtaining a speaker device 20 having a firmly fixed structure between the damper 30 and the frame 6.
As described above, according to the speaker device and the speaker device manufacturing method of the present embodiment of the present invention, using the damper containing aramid fiber makes it possible to increase the strength of the damper. Meanwhile, interposing the adhesive material between the frame and the perimeter edge portion of the damper, clamping the perimeter edge portion of the damper with the ring-shaped member disposed along the perimeter edge portion, and driving the screws through related material layers, together effect an exact and firm fixation between the damper and the frame.
Furthermore, since using the aramid fiber can increase a cutting strength and using the ring-shaped member can ensure a uniform pressing force applied to the perimeter edge portion of the damper, it is possible to avoid a cracking on the perimeter edge portion of the damper even if screws are used in the required fixation.
Furthermore, according to the above-described embodiment of the present invention, since fixing elements such as adhesive material, ring-shaped member and screws or the like are disposed on the flat portion (part) of the frame, an equivalent mass of the vibration system of the speaker device is increased, so that it is possible to inhibit the lowest resonance frequency f0, thus obtaining a high power speaker device effective for low volume output.
While there has been described what are at present considered to be preferred embodiments of the present invention, it will be understood that various modifications may be made thereto, and it is intended that the appended claims cover all such modifications as fall within the true spirit and scope of the invention.
Number | Date | Country | Kind |
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JP 2004-158063 | May 2004 | JP | national |