Focus detection apparatus and optical apparatus

Details Focus detection apparatus and optical apparatus Focus detection apparatus and optical apparatus

2005-06-14

2009-08-18

Koval, Melissa J (Department: 2862)

Photography

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

Optical detail with photoelement system

Reexamination Certificate

active

07577348

ABSTRACT:
A focus detection apparatus is disclosed, which realizes both of vertical line detection and horizontal line detection over a wide area of an image-taking range in focus detection of a phase difference detection method. The focus detection apparatus includes an optical system, which divides a luminous flux from an image-taking optical system to form a first pair of optical images having an interval between them in a first direction and a second pair of optical images having an interval between them in a second direction, and a photoelectrical conversion device. The optical system includes an optical member, which provides a first optical action widening the interval between the first pair of the optical images in the first direction. The first optical action is different from a second optical action for the second pair of the optical images in the second direction.

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patent: 6643460 (2003-11-01), Uchiyama et al.
patent: 6873358 (2005-03-01), Shimizu
patent: 2001/0003556 (2001-06-01), Ohmura

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