Focus detecting apparatus in which matching with the image perfo

Details Focus detecting apparatus in which matching with the image perfo Focus detecting apparatus in which matching with the image perfo

1991-06-24

1992-08-11

Perkey, W. B.

Radiant energy

Ionic separation or analysis

Static field-type ion path-bending selecting means

25020118, G03B 1336, G02B 734

Patent

active

051383594

ABSTRACT:
In an apparatus for detecting the relative positional relation between light intensity distributions relating to an object image and detecting the focus-adjusted state of an objective lens, a pair of stop openings for limiting an off-axis light flux forming light intensity distributions entering a pair of secondary imaging lenses are provided so as to be symmetrical with respect to a meridian centered at the optic axis of the objective lens so that the influence of the residual aberrations of the objective lens becomes uniform.

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