Focal point detection device and camera

Details Focal point detection device and camera Focal point detection device and camera

2005-12-13

2005-12-13

Perkey, W. B. (Department: 2851)

Photography

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

Dual purpose photoelement

C396S111000, C396S121000, C396S148000, C396S271000, C348S341000, C348S345000

Reexamination Certificate

active

06975810

ABSTRACT:
A camera comprises a spatial modulation optical filter that is disposed in a viewfinder optical system for subject observation at or near a position optically equivalent to an estimated image forming plane of a photographic optical system and modulates a subject light flux entering via the photographic optical system with transmission characteristics to obtain a light flux having a predetermined spatial frequency; a photoelectric conversion device that outputs a signal corresponding to detected light; an optical element that guides the subject light flux having been modulated at the spatial modulation optical filter to the photoelectric conversion device; and a focal adjustment state calculation means that calculates a focal adjustment state of the photographic optical system based upon the signal output from the photoelectric conversion device having received the modulated subject light flux.

REFERENCES:
patent: 4441798 (1984-04-01), Watanabe et al.
patent: 4488799 (1984-12-01), Suzuki et al.
patent: 6226461 (2001-05-01), Homma et al.
patent: 6549730 (2003-04-01), Hamada
patent: 2005/0036779 (2005-02-01), Iwane
patent: A 2001-203915 (2001-07-01), None

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