Apparatus for recording and/or reading information on an optical

Dynamic information storage or retrieval – Control of storage or retrieval operation by a control... – Mechanism control by the control signal

Patent

Rate now

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Details

369 44, 369275, G11B 7095, G11B 7007

Patent

active

048072141

ABSTRACT:
An apparatus for recording and/or reproducing information in and/or from an optically inscribable and readable disk-shaped record carrier with a pre-formed tracks with a track modulation constituted by a radial wobble, in order to obtain a tracking signal. A reference signal for deriving the tracking signal by synchronous detection is obtained by rectifying the difference signal which is the difference between the signals supplied by the two photo-detectors disposed on opposite sides of a line which extends in the track direction, by subsequently extracting the component of twice the frequency via a phase-locked loop and by frequency-dividing the signal, so that phase shifts of 180.degree. in the difference signal do not affect the synchronous detection.

REFERENCES:
patent: 4142209 (1979-02-01), Hedlund et al.
patent: 4238843 (1980-12-01), Carasso et al.
patent: 4326282 (1982-04-01), Verbloom et al.
patent: 4366564 (1982-12-01), de Haan et al.
patent: 4375088 (1983-02-01), de Haan et al.

LandOfFree

Say what you really think

Search LandOfFree.com for the USA inventors and patents. Rate them and share your experience with other people.

Rating

Apparatus for recording and/or reading information on an optical does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Apparatus for recording and/or reading information on an optical, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Apparatus for recording and/or reading information on an optical will most certainly appreciate the feedback.

Rate now

     

Profile ID: LFUS-PAI-O-1528312

  Search
All data on this website is collected from public sources. Our data reflects the most accurate information available at the time of publication.