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. 31, 2006
Filed:
Mar. 22, 2001
Mitsuru Sato, Tsurugashima, JP;
Junichi Furukawa, Tsurugashima, JP;
Kazuo Takahashi, Tsurugashima, JP;
Takanori Maeda, Tsurugashima, JP;
Hiroshi Nishiwaki, Tsurugashima, JP;
Takayuki Nomoto, Tsurugashima, JP;
Ikuya Kikuchi, Tsurugashima, JP;
Mitsuru Sato, Tsurugashima, JP;
Junichi Furukawa, Tsurugashima, JP;
Kazuo Takahashi, Tsurugashima, JP;
Takanori Maeda, Tsurugashima, JP;
Hiroshi Nishiwaki, Tsurugashima, JP;
Takayuki Nomoto, Tsurugashima, JP;
Ikuya Kikuchi, Tsurugashima, JP;
Pioneer Corporation, Tokyo, JP;
Abstract
A tracking servo apparatus in which reflection light obtained when a laser beam is irradiated onto a recording surface of an optical disc is photoelectrically converted, thereby obtaining a photoelectric conversion signal, a tracking error signal showing a deviation amount of an irradiating position of said laser beam for a track in a disc radial direction on the recording surface is generated by the photoelectric conversion signal, a spherical aberration occurring in an optical system is detected, a level of the tracking error signal is corrected on the basis of the detection result, and the irradiating position of the laser beam is moved in the disc radial direction in accordance with the level-corrected tracking error signal.