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:
Aug. 01, 1995
Filed:
Mar. 24, 1994
Osamu Ito, Amagasaki, JP;
Kyosuke Yoshimoto, Amagasaki, JP;
Yoshihiro Kiyose, Amagasaki, JP;
Kazuhiko Nakane, Amagasaki, JP;
Akira Mashimo, Tokorozawa, JP;
Hiroyuki Onda, Hoya, JP;
Koji Yamana, Setagaya, JP;
Takuya Nagata, Hoya, JP;
Mitsubishi Electric Corporation, both of, JP;
Teac Corporation, both of, JP;
Abstract
A miniaturized optical disk apparatus which performs a pull-in of a focus servo and a pull-in of a tracking servo without a position detector for detecting an optical head. If the optical head is located at a non-reflection film area and thus the focus servo cannot be performed, then the optical head is moved and the focus servo is performed again. This process is repeated until the focus servo can be achieved. In addition, if the optical head is located at a non-track area, then the optical disk is moved to a track area and then the tracking servo is performed. This process also repeated until the optical head is located over the track area. The tracking servo can be stably performed since it is performed only when the optical head is located over the track area. The present invention is applicable to the optical disk apparatus which uses a 3.5 in optical disk.