Optical focussing device

Details Optical focussing device Optical focussing device

1976-09-29

1977-05-10

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Photocell controls its own optical systems

250204, G01J 120

Patent

active

040230333

ABSTRACT:
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 distorted by elongation if focussing of the read-out beam on the data carrier is incorrect.

REFERENCES:
patent: 3482102 (1969-12-01), Thomas
patent: 3520625 (1970-07-01), Gillieron et al.
patent: 3719421 (1973-03-01), Poilleux et al.
patent: 3739247 (1973-06-01), Yamaguchi et al.
patent: 3844658 (1974-10-01), Gela et al.
patent: 3876841 (1975-04-01), Kramer et al.

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