Manufacturing method for narrow-type diaphragm and thin-type diaphragm, speaker-use diaphragm manufactured using same manufacturing method, speaker, electronic apparatus, and movable device
US9173036B2 · kind B2 · utility
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15Claims
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Key dates
| Filing date | May 1, 2014 |
| Grant date | Oct 27, 2015 |
| Priority date | — |
| Expiry date | May 1, 2034 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04R2307/021
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.