Apparatus for reading a disk-shaped optical record carrier

Details Apparatus for reading a disk-shaped optical record carrier Apparatus for reading a disk-shaped optical record carrier

1983-12-07

1986-01-28

McElheny, Jr., Donald

Facsimile and static presentation processing

Facsimile

Recording apparatus

358907, H04N 5781

Patent

active

045675333

ABSTRACT:
The invention relates to an apparatus for reading an optical record carrier. During a search mode when an optical read unit is rapidly moved in a radial direction. By means of a control circuit a servo control loop is rendered operative and inoperative by a control circuit in accordance with a predetermined periodic pattern. By means of a deflection element in the optical read unit, the servo control loop controls the scanning position of the read spot on the record carrier. During a fast search operation, the control circuit defines the operative period of the servo control loop in such a way that the address signals recorded in the vertical flyback periods of the video signal are read with a high reliability.

REFERENCES:
patent: Re29963 (1979-04-01), Janssen
patent: 3854015 (1974-12-01), Janssen
patent: 4057832 (1977-11-01), Kappert
patent: 4106058 (1978-08-01), Romeas et al.
patent: 4138663 (1979-02-01), Lehureau et al.
patent: 4236232 (1980-11-01), Janssen et al.
patent: 4330880 (1982-05-01), Van Dijk
patent: 4432082 (1984-02-01), Hsieh et al.

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