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. 30, 2007
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 provide an optical pickup astigmatism adjusting method capable of easily correcting an astigmatism even if the spot shape of a light beam converged on an optical disc is not a true circle. An optical pickup astigmatism adjusting system of the present invention finds an inter-focal distance Lbetween a focal position where a light beam is converged in RAD direction and another focal position where a light beam is converged in TAN direction, and a further inter-focal distance Lbetween a focal position where a light beam is converged in a direction inclined 45 degrees from RAD direction and another focal position where a light beam is converged in a direction inclined 45 degrees from TAN direction, thereby measuring an astigmatism in accordance with the inter-focal distances Land L. Then, an installation angle of a reflection mirror is adjusted in accordance with the inter-focal distances Land L, thus correcting the astigmatism.