Optical scanning device, mirror objective suitable for use in sa

Details Optical scanning device, mirror objective suitable for use in sa Optical scanning device, mirror objective suitable for use in sa

1989-12-05

1990-07-10

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

350443, 35016221, H01J 314

Patent

active

049408909

ABSTRACT:
An optical scanning device which includes a radiation source, a mirror objective an a radiation-sensitive detection system, the mirror objective being a transparent body having a radiation window and a reflector symmetrical therewith on each of two opposed surfaces of such body. First diffraction elements are respectively arranged on the first and second radiation window and the second reflector, whereby radiation directed through the first window is focussed to a scanning spot on an information plane and radiation from such plane after a second passage through the mirror objective includes a number of diffracted beams directed on the radiation detection system. The diffracted beams enable detection of tracking errors and focussing errors of the scanning spot relative to tracks on the information plane.

REFERENCES:
patent: 3825322 (1974-07-01), Mast
patent: 4554448 (1985-11-01), Sillitto
patent: 4835378 (1989-05-01), Coops
patent: 4835380 (1989-05-01), Opheij et al.

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