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MANUFACTURING METHOD FOR NARROW-TYPE DIAPHRAGM AND THIN-TYPE DIAPHRAGM, SPEAKER-USE DIAPHRAGM MANUFACTURED USING SAME MANUFACTURING METHOD, SPEAKER, ELECTRONIC APPARATUS, AND MOVABLE DEVICE

  • US 20140241565A1
  • Filed: 05/01/2014
  • Published: 08/28/2014
  • Est. Priority Date: 01/25/2012
  • Status: Active Grant
First Claim
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1. A method of manufacturing a narrow diaphragm or a thin diaphragm, the method comprising, in the sequence set forth:

  • beating pulp;

    mixing the beaten pulp with a filler so as to form a mixture of the beaten pulp and the filler;

    adding a paper-strengthening agent and a sizing agent as additives to the mixture;

    making paper from the mixture containing the additives; and

    drying the paper by hot-pressing;

    wherein a content of the filler in the mixture is in a range of 20 wt % to 80 wt %, inclusive, when the mixture is formed; and

    a polymeric viscosity improver with high viscosity is added after the additives are added and before making the paper.

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