Voice coil bobbin, manufacturing method thereof and speaker device
US7848537B2 · kind B2 · utility
Assignees
Inventors
Key dates
| Filing date | Aug 30, 2006 |
| Grant date | Dec 7, 2010 |
| Priority date | — |
| Expiry date | Oct 7, 2029 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04R31/00
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A voice coil bobbin is formed by skinpass rolling of pure titanium. A manufacturing method of a voice coil bobbin includes a process which manufactures a rolled pure titanium material, a process which executes skinpass rolling of the rolled material, and a process which forms the rolled material after the skinpass rolling to manufacture the voice coil bobbin. For example, the rolled pure titanium material is manufactured by a standard manufacturing process of a normal rolled material defined by JISH4600, and the cold rolling for the purpose of the strengthening is executed. The cold rolling is executed under a condition of a rolling ratio equal to or larger than 60%. Thereby, it becomes possible to obtain double hardness of JIS No. 1-kind titanium material (TR270C) and tensile strength larger than double of the JIS No. 1-kind titanium material (TR270C) and close to 6-4 titanium. By applying this thin voice coil bobbin with the high strength, the speaker device applicable for the high power input can be obtained.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.