Focus detecting device with shielding

Details Focus detecting device with shielding Focus detecting device with shielding

1980-03-18

1982-03-30

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Photocell controls its own optical systems

354 25, G01J 136

Patent

active

043226167

ABSTRACT:
In a focus detecting device wherein, from an object light passed through an image forming optical system, a first image and a second image are formed by a pair of re-imaging optical systems and the in-focus condition of the image forming optical system with respect to an object is detected from the variations in position of the first and second images with respect to a pair of photoelectric converters disposed on or near the focal planes of the pair of re-imaging optical systems, there is provided shield means for shielding, substantially symmetrically with respect to the optic axis of the image forming optical system, part of light beams forming the first and second images formed on the pair of photoelectric converters by the image forming optical system and the pair of re-imaging optical systems.

REFERENCES:
patent: 4117325 (1978-09-01), Holle et al.
patent: 4258989 (1981-03-01), Tokutomi et al.

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