The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Dec. 07, 2010
Filed:
Aug. 30, 2006
Toshihiro Ishigaki, Yamagata, JP;
Yoshihide Goto, Yamagata, JP;
Taiki Goto, Yamagata, JP;
Shuji Higuchi, Tokyo, JP;
Toshihiro Ishigaki, Yamagata, JP;
Yoshihide Goto, Yamagata, JP;
Taiki Goto, Yamagata, JP;
Shuji Higuchi, Tokyo, JP;
Pioneer Corporation, Tokyo, JP;
Tohoku Pioneer Corporation, Tendo-shi, Yamagata, JP;
Goto Denshi Co., Ltd., Sagae, Yamagata, JP;
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.