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. 29, 2002
Filed:
Jan. 27, 2000
Abstract
The present invention provides an optical disc apparatus which solves a problem that the tracking control takes off when an objective lens is displaced in the tracking direction due to its weight. In this optical disc apparatus, a spot position detector generates a spot position signal which indicates a position of a light spot on a light receiving element , and supplies the signal to a traverse loop filter and a spot position loop filter . A controller supplies an output from the spot position loop filter to a tracking actuator , before supplying an output from the traverse loop filter to a traverse motor , previously moves the light spot near the center of the light receiving element , and starts the traverse control in a state where a value of the spot position signal at starting of the traverse control is reduced.