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:
Nov. 20, 2012
Filed:
Aug. 01, 2006
Akihiro Ashida, Urayasu, JP;
Koji Kaniwa, Yokohama, JP;
Jinya Ikeda, Kasama, JP;
Satoru Moriya, Hadano, JP;
Akihiro Ashida, Urayasu, JP;
Koji Kaniwa, Yokohama, JP;
Jinya Ikeda, Kasama, JP;
Satoru Moriya, Hadano, JP;
Hitachi-LG Data Storage, Inc., Tokyo, JP;
Abstract
In an optical disc apparatus, when a signal to be generated corresponding to an amount of reflected light from an optical disc has a signal level below a threshold level for a period exceeding a reference period, a controller controls an actuator to move an objective lens in a direction such that a distance from the optical disc surface to the objective lens increases. The reference period may be set based on a type of the optical disc and a recording or reproducing speed of the optical disc, or based on a surface deflection of the optical disc.