Electrical audio signal processing systems and devices – Electro-acoustic audio transducer – Electromagnetic
Reexamination Certificate
2006-08-30
2010-12-07
Nguyen, Tuan D (Department: 2614)
Electrical audio signal processing systems and devices
Electro-acoustic audio transducer
Electromagnetic
C381S400000
Reexamination Certificate
active
07848537
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.
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Goto Taiki
Goto Yoshihide
Higuchi Shuji
Ishigaki Toshihiro
Goto Denshi Co., Ltd.
Nguyen Tuan D
Nixon & Vanderhye P.C.
Pioneer Corporation
Tohoku Pioneer Corporation
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