Focus detection optical system having a plurality of focus...

Details Focus detection optical system having a plurality of focus... Focus detection optical system having a plurality of focus...

2008-05-01

2010-06-15

Luu, Thanh X (Department: 2878)

Radiant energy

Photocells; circuits and apparatus

Photocell controls its own optical systems

C396S114000

Reexamination Certificate

active

07737386

ABSTRACT:
The invention relates to a focus detection optical system used with the so-called autofocus (AF) system mounted on single-lens reflex cameras (SLRs) or the like, and an imaging apparatus incorporating it. The focus detection optical system comprises at least n focus detection areas that are adjacent to or intersect each other on a predetermined imaging plane, where n≧2. A re-imaging lens group comprises n+1 re-imaging lenses, A (n−1)th re-imaging lens and an nth re-imaging lens are a pair of re-imaging lenses that correspond to a (n−1)th focus detection area and are adjacent to each other. An nth re-imaging lens and a (n+1)th re-imaging lens are a pair of re-imaging lenses that correspond to the nth focus detection area and are adjacent to each other. The (n−1)th re-imaging lens and (n+1)th re-imaging lens are located at different positions.

REFERENCES:
patent: 4185191 (1980-01-01), Stauffer
patent: 6239912 (2001-05-01), Ozawa
patent: 57-49841 (1982-10-01), None
patent: 01-266503 (1989-10-01), None
Photo Industrial November, Phase Difference Detection Method For AF Single-Lens Reflex Cameras (4), 1987, p. 107-109 (with English language translation).

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