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. 06, 2002
Filed:
Mar. 15, 1999
Junichi Furukawa, Tsurugashima, JP;
Pioneer Electronic Corporation, Tokyo-To, JP;
Abstract
A tilt servo control apparatus for an optical disk is provided, which is able to keep a high reproduction quality by correcting tilt errors with its construction simplified and compact. The tilt servo-control apparatus includes: an optical pickup for irradiating an optical beam onto an optical disk and detecting a reflected light from the optical disk; a tilt-correction unit for correcting, using a correction amount, a tilt error due to aberration caused by a tilt angle formed between an optical axis of the optical beam and a normal line of the optical beam at an emitted position on the optical disk; an amplitude detecting unit for detecting a maximum amplitude and a minimum amplitude of a detected signal by the optical pickup within a period of one rotation of the optical disk; and a tilt-correction controlling unit for providing a control signal to control the correction amount used in the tilt-correction unit. The tilt-correction controlling unit includes a unit for applying variations to the control signal and adjusting the control signal so that a difference between the maximum amplitude and the minimum amplitude is minimized responsively to the variations.