Optical recording medium and recording and/or reproducing appara

Details Optical recording medium and recording and/or reproducing appara Optical recording medium and recording and/or reproducing appara

1995-04-04

1996-01-23

Hindi, Nabil Z.

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

369 4426, 369 4441, 3692753, G11B 700

Patent

active

054870569

ABSTRACT:
An optical recording medium on which a data signal is formed comprises an area A of recording tracks for recording a data signal between pairs of grooves Gr and a d.c. offset cancel area B for canceling d.c. offset by the push-pull system, which serves as a predetermined area. In the d.c. offset cancel area B, no grove Gr is formed, and grooves are formed at the recording track center positions Tc. The groove at the recording track center position Tc is caused to have the same width and depth as those of the groove Gr. In carrying out recording/reproduction of a data signal by using this optical recording medium, a return light from the optical recording medium is detected by a bisected detector. A difference signal between outputs from the detector is determined by an amplifier. In accordance with an output signal of a sample-hold signal supply unit, first and second sample-hold units respectively hold signals having output phases different from each other by 180 degrees An adder adds these signals to take out only a d.c. fluctuation component to eliminate the d.c. fluctuation component superimposed on a tracking error signal at a d.c. offset eliminating unit.

REFERENCES:
patent: 4663751 (1987-05-01), Kaku et al.
patent: 4751695 (1988-06-01), Kaku et al.
patent: 4849953 (1989-07-01), Nomura et al.
patent: 4855983 (1989-08-01), Arai
patent: 4858221 (1989-08-01), Romeas
patent: 4866688 (1989-09-01), Ohtake et al.
patent: 5253238 (1993-10-01), Shimonou
patent: 5268887 (1993-12-01), Honguh et al.
patent: 5270998 (1993-12-01), Uchiumi
patent: 5383169 (1995-01-01), Shinoda et al.

Affiliated with

Also associated with

Rating

Optical recording medium and recording and/or reproducing appara does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Optical recording medium and recording and/or reproducing appara, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Optical recording medium and recording and/or reproducing appara will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1509888