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. 04, 2005
Filed:
Apr. 03, 2002
Yoshimichi Nishio, Kawagoe, JP;
Hitoshi Yamazaki, Kawagoe, JP;
Kazunori Matsuo, Kawagoe, JP;
Takashi Suzuki, Kawagoe, JP;
Yoshihiro Hashizuka, Kawagoe, JP;
Takashi Sasaki, Kawagoe, JP;
Kenichi Takahashi, Kawagoe, JP;
Hiroki Goto, Kawagoe, JP;
Hideaki Watarihana, Kawagoe, JP;
Yoshimichi Nishio, Kawagoe, JP;
Hitoshi Yamazaki, Kawagoe, JP;
Kazunori Matsuo, Kawagoe, JP;
Takashi Suzuki, Kawagoe, JP;
Yoshihiro Hashizuka, Kawagoe, JP;
Takashi Sasaki, Kawagoe, JP;
Kenichi Takahashi, Kawagoe, JP;
Hiroki Goto, Kawagoe, JP;
Hideaki Watarihana, Kawagoe, JP;
Pioneer Corporation, Tokyo, JP;
Abstract
An optical disk playing apparatus which performs at least a focusing servo operation for reading light as a servo operation and irradiates the reading light onto one optical disk, receives reflected light from the optical disk by a pickup to obtains a light receiving signal, moves an irradiated position of the reading light onto the optical disk to cross tracks on the disk; generates a tracking error signal in response to the reading signal during the track crossing; compares the tracking error signal with a threshold value; and determines the type of the optical disk in accordance with the number of pulses in the compared result signal within a predetermined period from start of the track crossing.