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:
Oct. 26, 2009
Filed:
Oct. 01, 2003
Katsuya Watanabe, Nara-ken, JP;
Mitsurou Moriya, Nara-ken, JP;
Shin-ichi Yamada, Oosaka-fu, JP;
Yasuaki Edahiro, Osaka-fu, JP;
Takeharu Yamamoto, Osaka-fu, JP;
Katsuya Watanabe, Nara-ken, JP;
Mitsurou Moriya, Nara-ken, JP;
Shin-ichi Yamada, Oosaka-fu, JP;
Yasuaki Edahiro, Osaka-fu, JP;
Takeharu Yamamoto, Osaka-fu, JP;
Panasonic Corporation, Osaka, JP;
Abstract
An optical disk apparatus comprises a focusing means for focusing a light beam on a recording medium having first and second information faces; means for moving a focal point of the light beam in a direction substantially perpendicular to the information faces of the recording medium; means for detecting a reflected light from the recording medium; means for detecting a focus condition of the light beam on the basis on an output signal from the reflected light detecting means; a focus control means for driving the focal point moving means on the basis of an output signal from the focus condition detecting means, and controlling the light beam so that the focus condition of the light beam becomes a prescribed focus condition; and a focus jumping means for moving the focal point of the light beam from the first information face to the second information face by driving the focal point moving means.