Method and apparatus for noncontact automatic focusing

Details Method and apparatus for noncontact automatic focusing Method and apparatus for noncontact automatic focusing

1987-12-18

1989-06-27

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Photocell controls its own optical systems

356 4, G01J 120

Patent

active

048432288

ABSTRACT:
Method and apparatus, employing a polarized He-Ne laser beam as a measuring beam, for changing the angle of incidence of the measuring beam upon an object in connection with a system capable of performing precision automatic focusing of the measuring beam upon the object in a noncontacting manner whether upon the surface of a transparent body or upon the surface of an opaque substance.

REFERENCES:
patent: 4276471 (1981-06-01), Utagawa
patent: 4383168 (1983-05-01), Luck, Jr.
patent: 4595271 (1986-06-01), Suda et al.
patent: 4623253 (1986-11-01), Okutani et al.

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