Loudspeaker diaphragm and its mfg. method

A vibrating diaphragm and loudspeaker technology, applied in the direction of diaphragm structure, transducer diaphragm, plane diaphragm, etc., can solve impractical problems

Inactive Publication Date: 2004-07-28
ONKYO KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, this technique is not practical at all

Method used

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  • Loudspeaker diaphragm and its mfg. method
  • Loudspeaker diaphragm and its mfg. method
  • Loudspeaker diaphragm and its mfg. method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0066] A solution of unsaturated polyester was prepared with the following composition:

[0067] Unsaturated polyester resin (N350L, manufactured by Nippon Shokubai Co., Ltd.)

[0068] 100(parts)

[0069] Low shrinkage agent (MODIPER S 501, produced by NOF Corporation) 5 (parts)

[0070] Curing agent (manufactured by PEROCTA O NOF Corporation) 1.3 (parts)

[0071] A cotton woven fabric (cotton yarn count: #20, 40 warp and 40 weft, weaving density: 110 g / m 2 ) was cut into 15 cm long and 15 cm wide. The plain weave woven fabric of PEN fiber (TeijinLimited production, fineness: 1100 dtex (decitex), per inch 17 warps and 17 wefts, weaving density: 166g / m ) is cut into 15cm long, 15cm is wide, puts on cotton machine fabric so as to obtain a two-layer laminate.

[0072] An opening with a diameter of approximately 13 cm was formed in the central portion of a stainless steel plate approximately 16 cm long by 16 cm wide to obtain ...

Embodiment 2

[0078] A loudspeaker vibrating diaphragm was manufactured in the same manner as in Example 1, except that a liquid crystal polymer non-woven fabric (Kuraray Co., Ltd. produced, its trade name was Vectran, fiber fineness: 1600 denier, and METSUK (fabric density): 60g / m2) instead of cotton woven fabric. The vibrating membrane thus obtained was subjected to the same measurement as in Example 1. The results are listed in Table 1. Also, frequency characteristics of a speaker employing the diaphragm thus obtained were measured. The results are shown in Figure 4 middle.

Embodiment 3

[0080] Loudspeaker diaphragms were produced in the same manner as in Example 1, except that the plain woven fabric of PEN fibers was impregnated with 5 parts of melamine (based on 100 parts of fabric), and then laminated on the cotton woven fabric . The vibrating membrane thus obtained was subjected to the same measurement as in Example 1. The results are shown in Table 1 above. Also, frequency characteristics of a speaker employing the diaphragm thus obtained were measured. The results are shown in Figure 5 middle. Furthermore, the contact angle was measured in the same manner as in Example 1 on the vibrating membrane thus obtained. The results are shown in Table 2 above.

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Abstract

A loudspeaker diaphragm having light weight and an excellent balance between a rigidity and an internal loss, and a simple and inexpensive method for manufacturing such a diaphragm are provided. A loudspeaker diaphragm according to the present invention includes a base layer having a woven fabric of a polyethylene naphthalate fiber impregnated with a thermosetting resin, and optionally a thermoplastic resin layer and / or a thermoplastic elastomer layer. The polyethylene naphthalate fiber is preferably an untwisted fiber. A fiber / resin ratio in the base layer is preferably in the range of 60 / 40 to 80 / 20. Preferably, the thermoplastic resin layer has a finely foamed structure and an average diameter of a cell in the finely foamed structure is 10 to 60 mum.

Description

technical field [0001] The present invention relates to loudspeaker diaphragms and methods of making such diaphragms. More particularly, the present invention relates to a loudspeaker diaphragm that is lightweight and has a good balance between stiffness and internal losses, and a simple, low-cost method of manufacturing such a diaphragm. Background technique [0002] Typically, the required properties of a loudspeaker diaphragm include a high Young's modulus (high elastic modulus or stiffness) and appropriate internal loss (tan δ). As a method of improving Young's modulus, a typical example is a vibrating diaphragm of FRP (Fiber Reinforced Plastic) using a composite material of carbon fiber and epoxy resin. As a method of improving internal loss, a typical example is to use a diaphragm of synthetic resin such as polypropylene. [0003] The vibrating membranes described above have problems respectively. In particular, FRP diaphragms have a high Young's modulus. However, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04R7/10H04R7/12H04R31/00
CPCH04R31/003H04R2307/025H04R7/125H04R7/10H04R2307/029Y10T29/49005Y10T29/4908
Inventor 小野祐司井上利秀
Owner ONKYO KK
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