Method and apparatus for detecting focus conditions of a photogr

Details Method and apparatus for detecting focus conditions of a photogr Method and apparatus for detecting focus conditions of a photogr

1982-12-08

1985-12-31

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Photocell controls its own optical systems

250204, 354407, G01J 120

Patent

active

045623457

ABSTRACT:
A method and apparatus for detecting focus conditions of a photographic optical system is disclosed. The invention comprises a member for dividing the wavefront of a light beam from a photographic optical system in an image space thereof, a first light receiving device including two photocell arrays provided in the front and the rear of a surface conjugated to a predetermined focal plane of the optical system, and a second light receiving device including at least one photocell array provided at a surface conjugated to one of the photocell arrays in the first light receiving device. A first signal representing horizontal shift of an optical image is detected based on outputs of at least one photocell array in the second light receiving device and one photocell array in the first light receiving device having a relation conjugated to the photocell array in the second light receiving device. A second signal representing defocused amount of the image is detected based on outputs of two photocell arrays in the first light receiving device thereby detecting focus conditions by the first and the second signals.

REFERENCES:
patent: 4230401 (1980-10-01), Tokutomi et al.
patent: 4352545 (1982-10-01), Uno et al.
patent: 4492449 (1985-01-01), Oinue et al.

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