Optical video playback apparatus with tracking control and TBC

Details Optical video playback apparatus with tracking control and TBC Optical video playback apparatus with tracking control and TBC

1977-05-16

1979-01-23

Cardillo, Jr., Raymond F.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

1791003V, H04N 576, G11B 2110

Patent

active

041363620

ABSTRACT:
In apparatus for optically reproducing information signals from a record carrier, such as a video disc, and in which a light beam from a source, such as a laser is incident through an objective lens onto the surface of the record carrier and a tracking servo control is provided for adjusting the position of the incident light beam on the record carrier; a time base correction mirror operates on the light beams both incident onto, and reflected from the record carrier, and a tracking servo mirror operates only on the light beam incident onto the record carrier. A beam splitter and quarter wave plate are preferably positioned in the optical path between the tracking control mirror and the time base correction mirror. The apparatus may also include a lens with opposed spherical and cylindrical surfaces in the path of the reflected beam between the objective lens and a signal detection photodiode.

REFERENCES:
patent: 3876842 (1975-04-01), Bouwhuis
patent: 3952148 (1976-04-01), Laub
patent: 4044378 (1977-08-01), Laub

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