Focus detecting apparatus

Details Focus detecting apparatus Focus detecting apparatus

2007-10-16

2007-10-16

Perkey, W. B. (Department: 2862)

Photography

With exposure objective focusing means, focusing aid, or...

Optical detail with photoelement system

30

Reexamination Certificate

active

11023738

ABSTRACT:
Disclosed is a focus detecting apparatus which is capable of enlarging a focus detection region and of enhancing focus detection precision. The focus detecting apparatus includes a secondary image forming optical system for forming a plurality of light, quantity distributions related to an object image from light beams passed through different pupil regions of an objective lens, and a photoelectric transducer having a plurality of pixel lines each having a plurality of pixels aligned in a predetermined direction, each of the plurality of light quantity distributions being formed on a corresponding pixel lines of the plurality of pixel lines. The secondary image forming optical system includes a deflecting member for deflecting at least one of the plurality of light quantity distributions in a direction perpendicular to the predetermined direction, and a correcting member for correcting displacement of an image formation position in the deflection direction of the deflecting member due to wavelength dependency.

REFERENCES:
patent: 4849782 (1989-07-01), Koyama et al.
patent: 2001-066496 (2001-03-01), None

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