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:
Feb. 09, 2010
Filed:
Nov. 11, 2005
Katsuya Watanabe, Nara, JP;
Junichi Minamino, Nara, JP;
Hiroshige Ishibashi, Toyonaka, JP;
Takeshi Shimamoto, Moriguchi, JP;
Katsuya Watanabe, Nara, JP;
Junichi Minamino, Nara, JP;
Hiroshige Ishibashi, Toyonaka, JP;
Takeshi Shimamoto, Moriguchi, JP;
Panasonic Corporation, Kadoma, JP;
Abstract
An optical disk drive is designed to read and/or write data from/on a spiral string of tracks where land and groove tracks are alternated. The drive includes: a light source for radiating a light beam; a lens for converging the light beam; a mechanism for moving the lens; a photodetector for generating an electrical signal based on at least a part of the light beam reflected from the optical disk; and a control section for controlling the light source and the mechanism responsive to the electrical signal. While performing a seek operation by having the lens moved by the mechanism such that a target track, from/on which the data should start being read or written, is irradiated with the light beam, the control section tries to get a PLL locked by irradiating another track, which precedes the target track by at least one, with the light beam.