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:
Jun. 20, 2006
Filed:
Feb. 12, 2004
Hitoshi Takiguchi, Saitama-ken, JP;
Hidekazu Ouchi, Saitama-ken, JP;
Yasushi Kumamaru, Saitama-ken, JP;
Naoki Yamada, Saitama-ken, JP;
Tetsuya Murakami, Saitama-ken, JP;
Yoshinari Kuwabara, Saitama-ken, JP;
Ko Ishii, Saitama-ken, JP;
Hitoshi Takiguchi, Saitama-ken, JP;
Hidekazu Ouchi, Saitama-ken, JP;
Yasushi Kumamaru, Saitama-ken, JP;
Naoki Yamada, Saitama-ken, JP;
Tetsuya Murakami, Saitama-ken, JP;
Yoshinari Kuwabara, Saitama-ken, JP;
Ko Ishii, Saitama-ken, JP;
Pioneer Corporation, Tokyo, JP;
Abstract
It is an object of the present invention to adjust the focus position of an optical pickup. A brightness measuring apparatus having a half mirror and an objective lens focusing on the half mirror is disposed at a position facing an optical pickup PUi, in a manner such that the objective lens OB of the optical pickup PUi faces the half mirror. Then, the optical pickup PUi is operated to start a focus servo, while the position of multi-lens provided in the optical pickup PUi is changed continuously, thereby measuring a highest brightness of a spot light image incident on the half mirror through the objective lens, by virtue of the brightness measuring apparatus. Subsequently, a highest brightness change caused by changing the position of the multi-lens ML is inspected so as to fix the multi-lens ML at a position when the maximum highest brightness has been obtained, thereby effecting an optimum focus position adjustment for an optical pickup.