Apparatus for optically reading signal information recorded on a

Details Apparatus for optically reading signal information recorded on a Apparatus for optically reading signal information recorded on a

1976-11-18

1978-07-11

Cardillo, Jr., Raymond F.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

1791003V, 250201, 250225, H04N 576, G11B 712

Patent

active

041005775

ABSTRACT:
An apparatus for optically reading or playing-back video or other signal information recorded as pits or other variations in a record track on a reflective record medium surface employs a polarized beam splitter by which a laser light beam is split into first and second polarized light beams which are respectively polarized in different polarization directions. The first polarized light beam is directed in a respective optical path so as to be projected against the record track on the record medium surface and reflected from the latter to a photo-detector or -sensor developing an output representing the recorded signal information, while the second polarized light beam is directed, in an optical path spaced from that of the first polarized light beam, so as to be projected against the record medium surface and reflected from the latter to control a servo-mechanism by which, for example, proper focusing or positioning of the first polarized light beam in respect to the record track is maintained.

REFERENCES:
patent: 3876841 (1975-04-01), Kramer et al.
patent: 3969576 (1976-07-01), Boonstra
patent: 3974327 (1976-08-01), VanDijk
patent: 3992575 (1976-11-01), Velzel
patent: 4027330 (1977-05-01), Maslowski et al.

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