Focus condition detecting device for cameras

Details Focus condition detecting device for cameras Focus condition detecting device for cameras

1984-08-14

1985-11-12

Perkey, William B.

Radiant energy

Ionic separation or analysis

Static field-type ion path-bending selecting means

250204, G03B 300, G01J 136

Patent

active

045524459

ABSTRACT:
In a focus condition detecting device of the type in which a pair of re-imaging lenses together with a condenser lens form a pair of re-images of an object image on a line sensor such that the distance between the corresponding points of the re-images on the line-sensor varies with the focus condition of a camera objective lens forming the objective image, the line sensor is located in front of a plane conjugate with a predetermined focal plane of the camera objective lens with respect to the condenser lens and the re-imaging lenses, so that the distance between the corresponding points of the first and second re-images on the line-sensor can be detected with resolution higher than one pitch length of the photocells of the line sensor.

REFERENCES:
patent: 3875401 (1975-04-01), Stauffer
patent: 4384210 (1983-05-01), Stauffer
patent: 4436395 (1984-03-01), Fukuhara

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