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. 25, 1995
Filed:
Feb. 12, 1993
Satoshi Furuta, Kato, JP;
Shigenori Yanagi, Kawasaki, JP;
Fujitsu Limited, Kawasaki, JP;
Abstract
An optical disk apparatus which is servo-controlled to trace a track according to a servo signal wherein the track is optically and selectively writable, readable and erasable according, respectively, to write, read and erase pulses of light emitted into the track. The optical disk apparatus includes a pulse edge detection mechanism which outputs an edge detection signal upon detecting an edge of a writing pulse or an edge of an erasing pulse, a masking pulse forming mechanism which generates, in response to the edge detection signal, a masking pulse used for disabling the servo signal during the masking pulse so as to prevent an erroneous servo signal caused from a switching transient of the writing pulse or the erasing pulse, and a pulse duration setting mechanism, receiving clock pulses as an input, for setting a pulse duration of the masking pulse by counting the clock pulses. The pulse duration setting mechanism includes a counter to count the clock pulses wherein a count number of the counter is presettable.