Photography – Flash system responsive to focal length or distance
Patent
1998-12-22
2000-11-28
Perkey, W. B.
Photography
Flash system responsive to focal length or distance
396 67, 396157, 396161, 396170, G03B 716, G03B 1505
Patent
active
061546127
ABSTRACT:
A flash control device for a camera includes a light emission unit which emits light to illuminate a subject to be imaged by the camera, a preliminary light emission control unit which causes the light emission unit to emit light during a preliminary light emission operation prior to a main exposure operation to be performed by the camera and until a predetermined amount of light is received by the camera during the preliminary light emission operation, a range computing unit which computes a distance from the camera to the subject, an exposure calculation unit which computes an aperture value for the camera during the preliminary light emission operation, a main light emission calculation unit which calculates a length of time that the light emission unit is to emit light during a main light emission operation based on the preliminary light emission operation, the computed distance to the subject, and the aperture value, and a main light emission control unit which controls the emission of light by the light emission unit during a main exposure operation within the camera based on an output of the main light emission calculation unit. A corresponding method for controlling an electronic flash unit adapted for use with a camera or other imaging device also is provided.
REFERENCES:
patent: Re35877 (1998-08-01), Takagi
patent: 5172157 (1992-12-01), Takagi
patent: 5400112 (1995-03-01), Takagi
patent: 5504553 (1996-04-01), Takagi
patent: 5576798 (1996-11-01), Takagi
patent: 6029011 (2000-02-01), Sato
Nikon Corporation
Perkey W. B.
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