Method and apparatus for automatic focusing an optical system wi

Details Method and apparatus for automatic focusing an optical system wi Method and apparatus for automatic focusing an optical system wi

1976-06-14

1977-09-13

Rolinec, Rudolph V.

Radiant energy

Photocells; circuits and apparatus

Photocell controls its own optical systems

250237G, 350162SF, G01J 120

Patent

active

040484920

ABSTRACT:
Method and apparatus for automatically focusing an optical system, particularly a microscope. A grating is located in the intermediate image plane and acts as a spatial frequency filter. A photoelectric detection system is associated with the grating. Electrical control signals are generated which are modulated by the relative motion between the object image and the grating. This motion is preferably normal to the longitudinal range of the grating marks. The grating used is short compared to the range of the intermediate image. The relative motions extending across several grating constants are generated between the image and the grating.

REFERENCES:
patent: 3781110 (1973-12-01), Leitz et al.
patent: 3856401 (1974-12-01), Heitmann et al.
patent: 3917409 (1975-11-01), Kaestner
patent: 3972021 (1976-07-01), Leitz et al.

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