Diaphragm for speaker, speaker, and method for producing diaphragm for speaker

A loudspeaker and vibrating membrane technology is applied to the manufacturing field of loudspeaker vibrating membranes, loudspeakers and loudspeaker vibrating membranes, and can solve the problems of difficulty in reproducing high-quality sound of digital devices, occupying loudspeaker manufacturing costs, insufficient rigidity of vibrating membranes, etc. To achieve the effect of widening reproduction bandwidth, improving rigidity and good sound quality

Inactive Publication Date: 2011-02-23
PANASONIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In addition, due to the lack of rigidity of conventional paper diaphragms, it is difficult to fully reproduce the high sound quality of digital equipment in terms of high-range sound quality.
In addition, since the manufacture of the paper diaphragm requires a large number of processes, it will occupy most of the manufacturing cost of the speaker.

Method used

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  • Diaphragm for speaker, speaker, and method for producing diaphragm for speaker
  • Diaphragm for speaker, speaker, and method for producing diaphragm for speaker
  • Diaphragm for speaker, speaker, and method for producing diaphragm for speaker

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Effect test

Embodiment approach 1

[0036] figure 1 It is a cross-sectional view of the speaker diaphragm in Embodiment 1 of the present invention. exist figure 1 Among them, the vibrating membrane 27 uses at least 5wt% or more fibers extracted from bamboo leaves, which is a vibrating membrane for a speaker manufactured by a papermaking process. Highly rigid natural fibers contain a large amount of silica compounds. In addition, since the shape and size of silica compounds vary depending on the type and part of the plant, by using fibers (pulp) extracted from plant types and parts containing a large amount of silica compounds, it is possible to improve Rigidity of the paper-made diaphragm, and further improvement of the sound quality of the speaker diaphragm.

[0037] That is, in general, it is important to select natural fibers as materials by paying attention to the amount of silica compounds in plants called plant opal.

[0038] In general, in terms of plant parts, the silica compound exists most in the p...

Embodiment 1

[0044] Bamboo leaves with a silicon concentration of 5030 μgSi / g and a weight of about 800 g were immersed in 400 g of water by chemical absorption photometry (molybdenum blue / yellow method), and then processed at room temperature for 10 minutes at 20 rpm using a pressurized kneader with a volume of 3 L. . The Canadian standard freeness (カナダ standard freeness) of this bamboo fiber is 730ml. A 16-cm circular speaker diaphragm was produced from the pulp by a papermaking process. Measurement was performed in a 1 Hz tension mode, and the sound velocity obtained from the elastic modulus at 20° C. was 2250 m / s.

[0045] Generally, there is a correlation between the speed of sound and the high-frequency limit frequency (high-range limit cycle number), and in order to make the reproduction range reach the human audible threshold, which is around 20kHz, the speed of sound basically needs to be around 1800m / s from a practical point of view.

Embodiment 2

[0047] According to the fiber ratio of common wood kraft pulp (NUKP) 70wt%, bamboo fiber 30wt% of embodiment 1, carry out the same operation as embodiment 1, manufactured 16cm circular loudspeaker diaphragm by papermaking process. The speed of sound is 2100m / s.

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Abstract

A diaphragm for a speaker is formed by making a sheet by using fibers extracted from bamboo leaves in a content of at least 5 wt%. Consequently, a high-sound-quality diaphragm for a speaker that has improved rigidity and a light environmental load, and is capable of reducing costs can be obtained.

Description

technical field [0001] The present invention relates to speaker diaphragms used in various audio equipment and video equipment, speakers, methods of manufacturing speaker diaphragms, electronic equipment such as stereo sets and television sets, and mobile devices such as automobiles. Background technique [0002] Recently, with the popularization of digital equipment, in the audio industry and the automobile industry equipped with audio equipment, the quality of audio signals tends to be high definition and wide bandwidth. As a result, the quality of the signal output from the speaker to which the audio signal of the high-quality digital device is input has been improved by leaps and bounds. In these industries, the development trend of loudspeakers is more high-quality sound, lightweight, and environmentally harmonious. [0003] In order to achieve higher sound quality, in order to realize the sound quality demanded by users, it is imperative to develop a diaphragm, which ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04R31/00H04R7/02
CPCH04R2307/025H04R2499/13H04R31/003H04R7/12H04R2307/021
Inventor 神阳平三村和义沟根信也藤井透
Owner PANASONIC CORP
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