Focus detecting optical system

Details Focus detecting optical system Focus detecting optical system

1988-03-21

1989-05-09

Perkey, W. B.

Radiant energy

Ionic separation or analysis

Static field-type ion path-bending selecting means

250201, 250204, G03B 300

Patent

active

048293326

ABSTRACT:
An optical system for use in a focus detecting apparatus has a photographing lens for forming an image of an object, a condenser lens disposed behind, with respect to the photographic lens, a plane corresponding to a photographing film surface, and a pair of split optical elements located behind the condenser lens for splitting the image of the object. The split optical elements are symmetrical with respect to a meridional plane of the condenser lenses. Using a line sensor, a relative positional shift of the images is detected by the optical system to determine a focal position. The optical system has a sufficiently large spherical aberration that the diameter of the minimum circle of confusion at the maximum contrast position is larger than the width of one bit of the line sensor.

REFERENCES:
patent: 4370551 (1983-01-01), Fukuhara et al.
patent: 4552445 (1985-11-01), Mukai
patent: 4716431 (1987-12-01), Shindo

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