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:
Mar. 23, 1999
Filed:
Apr. 17, 1998
Junichi Furukawa, Tsurugashima, JP;
Kiyoshi Tateishi, Tsurugashima, JP;
Noriaki Murao, Tsurugashima, JP;
Pioneer Electronic Corporation, Tokyo-to, JP;
Abstract
A tilt servo controlling apparatus is provided with: an optical pickup for emitting a light beam onto an optical record medium and detecting a reflection light from the optical record medium to thereby output a detection signal; a level detecting device for detecting a level of the detection signal outputted by the optical pickup; a tilt error correcting device for correcting a tilt error due to an aberration, which is generated by a tilt angle between (i) a normal line of a surface of the optical record medium at a position irradiated with the light beam and (ii) an optical axis of the light beam; and a tilt error correction controlling device for outputting a control signal to control a correction amount of the tilt error correcting device, by giving a variation to the control signal on a time base and adjusting the control signal so that the level detected by the level detecting device be optimized with respect to the variation of the control signal.