Focussing control with astigmatic diffracting means

Details Focussing control with astigmatic diffracting means Focussing control with astigmatic diffracting means

1981-06-08

1985-06-25

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Photocell controls its own optical systems

369 45, G01J 120

Patent

active

045256250

ABSTRACT:
Disclosed in this specification is a focussing control method for a laser retrieval apparatus. An astigmatic light flux of a laser beam is produced by a diffraction grating or hologram. It is received by a light sensitive device which is divided into four equal areas. The output signals from two pairs of oppositely facing areas are compared with each other, and the optical distance between the converging lens and the reflection surface is compensated, whereby the focus of the apparatus is controlled.

REFERENCES:
patent: 3992574 (1976-11-01), Bouwhuis et al.
patent: 4048492 (1977-09-01), Hartmann
patent: 4195909 (1980-04-01), Holle et al.

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