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. 01, 1991
Filed:
Mar. 13, 1990
Katsumi Kawamura, Tokorozawa, JP;
Pioneer Electronic Corporation, Tokyo, JP;
Abstract
A track transverse detection signal generating circuit in a LD or a CD player, which comprises a presence signal amplifier for amplifying a presence signal indicating that an optical spot for reading information exists on a recording track, a controller for receiving a speed signal corresponding to a moving speed of the optical spot for reading information on the recording track to control an amplification level of the presence signal amplifier in response to the moving speed of the optical spot, and a presence signal comparator for receiving the presence signal which has been amplified and transmitted from the presence signal amplifier, for making a comparison between the amplified presence signal and a reference value, and for transmitting a pulse-shaped track transverse detection signal. Therefore, a track transverse detection signal can be reliably generated by raising the gain of the presence signal amplifier or lowering the reference value of the present signal comparator in the case of a track jump operation in which the optical pickup moves at a speed higher than that in the case of an operation of reproducing the optical disk normally and in the case of a high speed accessing operation in which the same moves at a further raised speed.