Servo tracking circuit of an optically writable/readable/erasabl

Details Servo tracking circuit of an optically writable/readable/erasabl Servo tracking circuit of an optically writable/readable/erasabl

1993-02-12

1995-04-25

Hajec, Donald

Dynamic information storage or retrieval

Binary pulse train information signal

Binary signal gain processing

360 51, G11B 509, G11B 576

Patent

active

054105285

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.

REFERENCES:
patent: 3938184 (1976-02-01), DeFrancesco et al.
patent: 4611319 (1986-09-01), Naito
patent: 4764824 (1988-08-01), Tani et al.
patent: 4789975 (1988-12-01), Taniyama
patent: 4825307 (1989-04-01), Otokawa et al.
patent: 4855978 (1989-08-01), Kanamaru
patent: 4866691 (1989-09-01), Yokogawa
patent: 4982392 (1991-01-01), Soejima
patent: 5062009 (1991-10-01), Yamagata et al.
patent: 5146440 (1992-09-01), Yamaguchi et al.
patent: 5191566 (1993-03-01), Yamaguchi et al.
patent: 5214545 (1993-05-01), Maeda
patent: 5231618 (1993-07-01), Tabata et al.
Patent Abstracts of Japan, vol. 7, No. 238 (P-231), Oct. 22, 1983 & JP-A-58 125241 (Matsushita Denki Sangyo KK), Jul. 26, 1983.
Patent Abstracts of Japan, vol. 14, No. 253 (P-1054), May 30, 1990 & JP-A-02 066743 (Fujitsu Ltd), Mar. 6, 1990.

Affiliated with

Also associated with

Rating

Servo tracking circuit of an optically writable/readable/erasabl does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Servo tracking circuit of an optically writable/readable/erasabl, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Servo tracking circuit of an optically writable/readable/erasabl will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1572810