Apparatus for recording a wobbling, spiral guide groove on an optical disc

Patent 4942565 Issued on July 17, 1990. Estimated Expiration Date:

July 28, 2009. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.

Abstract Claims Description Full Text

Patent References

3591731

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Inventor

Lagadec, Roger

Assignee

Sony Corporation

Application

No. 387425 filed on 07/28/1989

US Classes:

369/47.49Control of transducer assembly mechanism

Examiners

Primary: Canney, Vincent P.

Attorney, Agent or Firm

Eslinger; Lewis H., Maioli; Jay H.

Foreign Patent References

0285984 EP. 05/19/1987
2550872 DE 05/19/1976
77933 JP 06/19/1981

International Class

G11B 001/24

Foreign Application Priority Data

1986-09-30 JP

Abstract

Recording apparatus for forming a track on a disk-shaped recording medium capable of optical information reproduction, comprises a deflection device for deviating a recording beam from a light source in a radial direction of the disk-shape recording medium and a deflection-control signal generating device. The deflection control signal is developed from the superimposition of a first signal having a predetermined frequency and a second signal having a lower frequency than the predetermined frequency. The superimposition of the second signal can be done while retaining the predetermined frequency.