Optical focussing device

Details Optical focussing device Optical focussing device

G - Physics

01

J

88/94, 352/32.21

G01J 1/20 (2006.01) G11B 7/00 (2006.01) G11B 7/09 (2006.01)

Patent

CA 1065054

ABSTRACT OF THE DISCLOSURE: A device for focussing a read-out light beam on a moving data carrier. It comprises an objective lens which causes said read-out beam to converge on the data carrier; a cylindrical lens arranged in the path of a light beam reflected by the data carrier; and photo-electric means for detecting the reflected beam and arranged in such a fashion that the light spot obtained there, normally substantially circular in shape, is distorded by elongation if focussing of the read-out beam on the data carrier is incorrect.

217900

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