Method and arrangement for automatically focussing an objective

Details Method and arrangement for automatically focussing an objective Method and arrangement for automatically focussing an objective

1975-10-03

1977-02-22

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Photocell controls its own optical systems

354 25, G01J 120

Patent

active

040093867

ABSTRACT:
An optical apparatus is provided with an objective and an autocollimation lens having a position and orientation bearing a known relationship to the position and orientation of the objective. A grating has alternating transmissive and non-transmissive portions. The grating is so positioned relative to the autocollimation path of the autocollimation lens that the latter projects an image of the grating onto the subject, and the image of the grating on the subject is projected back onto the grating. A photoelectric detector derives from the light projected back onto the grating an electrical signal indicative of the degree of focus of the objective. The setting of the objective is controlled in dependence upon the electrical signal.

REFERENCES:
patent: 3783270 (1974-01-01), Kamachi
patent: 3833807 (1974-09-01), Takeda
patent: 3906389 (1975-09-01), Matsumoto

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