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Speaker diaphragm and headphone

A vibrating plate and loudspeaker technology, which is applied in the shape of speaker diaphragm, on-ear/around-ear headphones, earphone manufacturing/assembly, etc. It can solve problems such as difficulty in obtaining sound and small frequency reproduction range

Pending Publication Date: 2021-07-23
YAMAHA CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] On the other hand, if a speaker diaphragm is formed from a paper-made body of cellulose nanofibers, the frequency reproduction range is small and it may be difficult to obtain desired sound.

Method used

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  • Speaker diaphragm and headphone

Examples

Experimental program
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Embodiment approach

[0056] The above-mentioned embodiments are not intended to limit the structure of the present invention. Therefore, the above-mentioned embodiments should be interpreted as omission, substitution, or addition of constituent elements of each part of the above-mentioned embodiments based on the description of this specification and common technical knowledge, and all of them should be interpreted as being included in the scope of the present invention.

[0057] For example, the speaker diaphragm may include layers other than the aforementioned mixed layer. As such a layer, the coating layer etc. which have a waterproof function are mentioned, for example. That is, the speaker diaphragm may be a multilayer body of other layers such as the above-mentioned mixed layer and coating layer.

[0058] The shape of the speaker diaphragm is not limited to the shape of the aforementioned embodiments, and may be, for example, a flat plate.

[0059] The speaker diaphragm can be used for spe...

Embodiment

[0061] Hereinafter, although this invention is demonstrated in detail based on an Example, this invention is not limitedly interpreted by description of this Example.

[0062] [Example]

[0063] [No.1]

[0064] CNF and PBO fiber (Zailong) manufactured by Toyobo Co., Ltd., which has an average length of 1mm and a fiber diameter larger than CNF, are mixed, and the density is 714kg / m 3 , surface density 88.5g / m 2 A flat sample composed of mixed layers. In No. 1, the content ratio of the PBO fiber was 10 parts by mass relative to 100 parts by mass of the total content of CNF and PBO fibers. In this example, the density and surface density were obtained from the values ​​of the cut out 5 mm x 40 mm test piece. In addition, the thickness of this test piece was calculated|required from the average value of the thickness of arbitrary three points in consideration of the small plane area of ​​a test piece.

[0065] [No.2]

[0066] The same CNF and PBO fibers as No. 1 were blended...

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PUM

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Abstract

The present invention addresses the problem of providing a speaker diaphragm which is capable of suppressing a drop in vibration propagation speed while increasing the frequency reproduction range. A speaker diaphragm 1 according to one embodiment of the present invention is provided with a mixed layer 11 including a cellulose nanofiber and a polyparaphenylenebenzobisoxazole fiber.

Description

technical field [0001] The present invention relates to a loudspeaker diaphragm and a headphone. Background technique [0002] In an audio device, it is sometimes possible to reproduce sounds in a wide frequency range from low to high tones by sharing a plurality of sound fields with a plurality of speakers. Examples of such speakers include a woofer that reproduces a low range, a midrange speaker that reproduces a middle range, and a tweeter that reproduces a high range. [0003] Among these speakers, for example, a diaphragm for a tweeter is required to be lightweight and have a large elastic modulus and internal loss (tan δ). From this point of view, a speaker diaphragm made of a paper-made body of cellulose nanofibers has been proposed (see Patent Document 1). [0004] On the other hand, if a speaker diaphragm is formed from a paper-made body of cellulose nanofibers, the frequency reproduction range is narrow, and it may be difficult to obtain desired sound. Therefore...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04R7/02H04R1/10
CPCH04R7/125H04R7/127H04R7/20H04R1/1075H04R1/1008H04R2207/021H04R2307/021H04R2307/029H04R2307/025H04R2307/207
Inventor 中岛弘佐野常典
Owner YAMAHA CORP
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