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:
Apr. 04, 1989
Filed:
Mar. 25, 1987
Katsumi Nagano, Setagaya, JP;
Kabushiki Kaisha Toshiba, Kanagawa, JP;
Abstract
To accurately achieve plural-track jump operations at high speed in an optical disk apparatus, a first embodiment is provided in which an analog track jump signal is applied to move an optical beam. The analog track jump signal includes a kick pulse for acceleration, a constant pulse for constant drive, and a stop pulse for deceleration. In a second embodiment, a digital track jump signal is applied to move an optical beam. An erroneous track jump detecting circuit is additionally provided for detecting whether the optical beam correctly jumps over a designated number of tracks by comparing a number of plural track jump signals corresponding to the designated number of tracks to be jumped with the number of track signals generated when the beam jumps across a track.