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:
May. 26, 2009
Filed:
Apr. 18, 2007
Yuuichi Kuze, Settsu, JP;
Kenji Fujiune, Takatsuki, JP;
Takashi Kishimoto, Nara, JP;
Shin-ichi Yamada, Katano, JP;
Katsuya Watanabe, Nara, JP;
Akihiro Yasuda, Katano, JP;
Shin-ichi Kadowaki, Sanda, JP;
Kousei Sano, Osaka, JP;
Yuuichi Kuze, Settsu, JP;
Kenji Fujiune, Takatsuki, JP;
Takashi Kishimoto, Nara, JP;
Shin-ichi Yamada, Katano, JP;
Katsuya Watanabe, Nara, JP;
Akihiro Yasuda, Katano, JP;
Shin-ichi Kadowaki, Sanda, JP;
Kousei Sano, Osaka, JP;
Panasonic Corporation, Osaka, JP;
Abstract
An optical disc device of the present invention includes spherical aberration changing means for changing spherical aberration occurring on a converging position of a light beam converged by a lens, an actuator for moving the spherical aberration changing means in a relatively precise manner, and an actuator for moving the spherical aberration changing means in a relatively rough manner. The optical disc device drives a second actuator and a third actuator based on a signal of spherical aberration detecting means and performs control so that spherical aberration is almost 0. The third actuator moves the spherical aberration changing means based on a direct current component included in a signal of the spherical aberration detecting means, and the second actuator moves the spherical aberration changing means based on an alternating current component included in the signal of the spherical aberration detecting means.