Method and apparatus for focusing a beam of light on an object

Details Method and apparatus for focusing a beam of light on an object Method and apparatus for focusing a beam of light on an object

1984-06-01

1986-12-30

Wan, Gene

Radiant energy

Photocells; circuits and apparatus

Photocell controls its own optical systems

356 4, G01J 120, G01C 308

Patent

active

046330747

ABSTRACT:
Focusing of a light beam on an object is effected by two mutually complementary techniques: in the first technique the beam spot on the object is reproduced on several measuring diaphragms arranged at different distances from the image plane and the light not blocked by the measuring diaphragms is evaluated for the detection of the focal point. This technique is highly sensitive and reacts rapidly. It is used for the continuous setting and resetting of focusing. The second technique utilizes the phenomenon of "speckling". Herein the light back scattered by the beam spot is evaluated for its granulation and optimum focusing determined as a function of the maximum coarseness of granulation. This second technique is insensitive to alignment and is thus used to calibrate the first technique. Both methods together yield a highly sensitive, precise and stable focusing system satisfying all practical requirements to a high degree.

REFERENCES:
patent: 4107520 (1978-08-01), Wilwerding

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