Patent Translate Powered by EPO and Google Notice This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate, complete, reliable or fit for specific purposes. Critical decisions, such as commercially relevant or financial decisions, should not be based on machine-translation output. DESCRIPTION JPS55107396 1Specification 1, Name of Invention Speaker diaphragm 3. Detailed Description of the Invention The present invention relates to a speaker diaphragm using synthetic pulp as a base material, and provides a speaker diaphragm having high rigidity and high internal loss. The conventional speaker diaphragm is often made of paper. This is because the paper has appropriate elastic modulus and internal loss, and can be reduced in weight. Recently, metals such as organic foam and aluminum have been used as materials to replace paper, but organic foams have small elastic modulus, and metal diaphragms have advantages such as small internal loss and increased weight, It can not be said that it is optimal as a speaker diaphragm. Also, in order to improve the elastic modulus of paper, a mixed vibration plate with inorganic fibers or organic synthetic fibers has been developed, but a large improvement in elastic modulus can not be expected. Furthermore, since the three diaphragms of paper are hygroscopic, they are weak to humidity and are not suitable as diaphragms. EndPage: A speaker diaphragm having an elastic modulus and an internal loss. Conventionally, the paper making of synthetic pulp 1oo% has an elastic modulus. The bending stiffness was small and it was poor to put it to practical use as a speaker diaphragm. Then, the composite pulp of the synthetic pulp and the inorganic fiber or the organic fiber was tried, and it was confirmed that the elastic modulus was improved. However, although the elastic modulus was greatly improved, the internal loss was not so improved. The present invention greatly improves the elastic modulus, the internal loss, and the bending rigidity by using a composite in which synthetic pulp is used as a base material and mixed fibers are used in two layers. The "synthetic pulp" in the present invention is made of polyethylene, polypropylene, nylon, polyacrylonitrile or the like as a main raw material, and these are shorted and fibrillated. In addition, "inorganic fibers" used for 10-05-2019 1 compounding are carbon fibers and alumina fibers. Say glass fiber 1. "Organic fiber" 7 refers to aromatic polyamide fiber, tunol fiber, etc. The thermoplastic film used for 2 ° \ lamination has a modulus of elasticity, a curvature of ゝ, X10. The films used differ depending on whether the rigidity is improved or the internal loss is improved. Generally used resins such as polyester, polypropylene, nylon and polyurethane. Thermosetting resin refers to epoxy, polyester, phenol, melamine, etc., and is intended to improve bending rigidity. Elastic modulus, flexural rigidity and internal loss are greatly influenced by the proportion and type of fibers used in the two-layer structure. Generally, two or three types of fibers are compounded in synthetic pulp, and it is baric if it is a two-layer structure rather than a two-layer structure, but it is impossible to improve the elastic modulus, bending rigidity and internal loss together is there. If one improves, one decreases. The proportion of fibers used in the composite was 25 wt% at maximum, and even if the proportion of fibers was increased, the modulus of elasticity only decreased. Examples of the present invention will be described below. The synthetic pulp used in the examples is a freeness of 230 m7i (Canadian freeness), a fiber length of 14 or less, and (7) polyethylene short fibers. Example 1 Synthetic pulp and carbon fiber (80 + 20) were mixed and formed into a sheet by using a round net sheet machine to prepare a first composite sheet. The carbon fiber used is a short fiber with a fiber length of 3 w Ib and a diameter of 1 o.mu., using acrylinide =, "IJ" as a raw material, and it is a fabric weight eofl'4 of the composite sheet. On the other hand, similarly, synthetic pulp was mixed with 3 pieces of fiber length and 2 denier aromatic periamide fibers (85; 15), and made into a sheet to prepare a second composite sheet with a basis weight of 40 f 2. As shown in FIG. 1, two sheets of the first composite sheet 1 and the second composite sheet 2 were combined and formed into a cone by heat pressing. The temperature i of the heat press is 16 ° C., and the polyethylene short fiber which is a synthetic pulp is melted to bond the two composite sheets 1 and 2 together. Example 2 Between the two composite sheets 1 and 2 prepared in Example 1, as shown in FIG. The composite sheet 1, the modified polyamide film 3, and the composite sheet 2 were integrated. Example 3 An epoxy resin film of 10 J '/' x was sandwiched between two composite sheets prepared in Example 1 and molded by heat pressing at 210 ° C. to melt polyethylene, which is a synthetic pulp. And cure the epoxy resin film. The elastic modulus, flexural rigidity and internal loss of the composites of Examples 1 and 2 mentioned above are shown in the following table in comparison with a conventional paper cone. Table 1 EndPage: A speaker of 2 bores 1 ocym was assembled, and the result of measuring the frequency characteristic of this speaker according to JIS-BOX is shown in FIG. In FIG. 3, 7a indicates the characteristic of the speaker using the diaphragm of the first embodiment, and b indicates the characteristic of the conventional speaker using the paper cone. The present invention has the above-described configuration, and according to the present invention, the elastic modulus 1 bending rigidity and the internal loss become large, and according to the speaker using the diaphragm of the present invention, the reproduction band is expanded. It is. 10-05-2019 2 4. Brief description of the drawings Fig. 1 is a cross-sectional view of a speaker diaphragm in one embodiment of the present invention, Fig. 2 is a cross-sectional view of another embodiment of the present invention, and Fig. 3 is a diaphragm of the present invention. A speaker using a speaker and a conventional speaker using a paper cone. It is a sound pressure frequency characteristic figure of power. 1.2 · · · · · · · composite sheet, 3 · · · · · · · · modified polyamide film. ・ To 1, Name of attorney Attorney Nakao and others 1 person Figure 1 Figure 2 Figure 3 = 7f I provisional @ K ('Dr) EndPage: 3 10-05-2019 3
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