Scanning device for an optical recording and/or reproducing appa

Details Scanning device for an optical recording and/or reproducing appa Scanning device for an optical recording and/or reproducing appa

1987-09-21

1989-05-30

Westin, Edward P.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

350444, 350446, 369112, G02B 1700, G11B 712

Patent

active

048353809

ABSTRACT:
A scanning device for an optical recording and/or reproducing apparatus comprises a mirror objective in the form of a transparent body one surface of which forms an internally reflecting concave reflector and the opposite surface of which forms an internally reflecting convex reflector. A beam of radiation from a radiation source enters a window in the concave reflector, is divergently reflected by the convex reflector back to the concave reflector, and is consequently reflected thereby through a second window in the transparent body so as to form a scanning spot focussed on an information plane to be scanned by the device. The mirror objective includes a phase grating by which radiation reflected from the information surface is separated from the scanning beam and is directed to a radiation-detection system. A very compact write and/or read scanning device is thereby obtained, which may be given a very robust and stable from by fixing the radiation source and the radiation detection system to the surface of the transparent body.

REFERENCES:
patent: 2656761 (1953-10-01), Blaisse
patent: 3825322 (1974-07-01), Mast
patent: 4554448 (1985-11-01), Sillitto
patent: 4589738 (1986-05-01), Ozaki

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