Light-amount control device for photographing

Details Light-amount control device for photographing Light-amount control device for photographing

2008-01-22

2008-01-22

Perkey, W. B. (Department: 2862)

Photography

Flash system responsive to focal length or distance

C396S164000, C348S371000

Reexamination Certificate

active

07321725

ABSTRACT:
A light-amount control device includes a plurality of lighting units each of which emits light for illuminating a photographing area of a photographing optical system. Further, the light-amount control device includes a peripheral light amount data calculator and a lighting unit controller. The peripheral light amount data calculator calculates a peripheral light amount data defining ratios of light emission intensities for the lighting units, to make the illuminance of an image plane of a standard object that has a flat surface being perpendicular to the optical axis of the photographing optical system and having a constant reflecting light ratio, constant when the standard object is illuminated by the lighting units. The image plane is formed by reflected light from the surface of the standard object that enters the photographing optical system. The lighting unit controller controls the lighting units so that the intensity of light at a wider illuminating angle to an optical axis of the photographing optical system becomes higher, based on the peripheral light amount data.

REFERENCES:
patent: 5713053 (1998-01-01), Hirai
patent: 6400455 (2002-06-01), Kurokawa et al.
patent: 2006/0110145 (2006-05-01), Fujimoto et al.
patent: 2003-114463 (2003-04-01), None
patent: 2002-148686 (2003-05-01), None
patent: WO 2004088588 (2004-10-01), None
English Language Abstract of JP2003-114463, published Apr. 18, 2003.
U.S. Appl. No. 10/956,076 to Shuzo Seo, filed on Oct. 4, 2004.

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