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:
Jan. 04, 2005
Filed:
Aug. 29, 2001
Koichiro Kishima, Kanagawa, JP;
Akira Kouchiyama, Kanagawa, JP;
Kenji Yamamoto, Kanagawa, JP;
Gakuji Hashimoto, Saitama, JP;
Atsushi Iida, Tokyo, JP;
Koichiro Kishima, Kanagawa, JP;
Akira Kouchiyama, Kanagawa, JP;
Kenji Yamamoto, Kanagawa, JP;
Gakuji Hashimoto, Saitama, JP;
Atsushi Iida, Tokyo, JP;
Sony Corporation, , JP;
Abstract
An optical head, able to reduce thermal stress generated in an optical lens mounted on a bobbin, having a bobbin formed with a center hole and an optical lens mounted on the bobbin via a thermal expansion adjustment memberformed with an opening. The optical lens has a substrate formed by an optical material different from the bobbin in coefficient of thermal expansion. The substrate has a convex part functioning as a convex lens and a flat part positioned around the convex part. The flat part is fixed to the thermal expansion adjustment member so that the convex part fits in the opening. The optical lens is placed so that a center axis of the convex part or an extension thereof passes through the center hole of the bobbin and the center axis of the convex part coincides with a center hole of the bobbin.