MANUFACTURING METHOD FOR NARROW-TYPE DIAPHRAGM AND THIN-TYPE DIAPHRAGM, SPEAKER-USE DIAPHRAGM MANUFACTURED USING SAME MANUFACTURING METHOD, SPEAKER, ELECTRONIC APPARATUS, AND MOVABLE DEVICE
First Claim
Patent Images
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.
4 Assignments
0 Petitions
Accused Products
Abstract
After beaten, pulp is mixed with a filler to obtain a mixture of the pulp and the filler. Additives are added to the mixture, which is made into pater and then hot-pressed. The filler content of the mixture is in the range of 20 wt % to 80 wt %. After the additives are added, a polymeric viscosity improver with high viscosity is added to produce a narrow diaphragm or a thin compact diaphragm with high aspect ratio. These diaphragms have high rigidity and a wide reproduction frequency range.
-
Citations
17 Claims
-
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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
-
Specification