Built-in flash camera

Details Built-in flash camera Built-in flash camera

1996-04-05

1997-11-11

Malley, Daniel P.

Photography

Flash system responsive to focal length or distance

396 63, 396 64, G03B 1505

Patent

active

056874006

ABSTRACT:
A photometry part measures a brightness within a shot visual field. A focusing part measures a distance up to a main subject. A focal length measuring part measures a focal length of a taking lens. A strobe light control part directs a strobe to flash regularly and decreases a strobe exposure gradually from a standard exposure in accordance with the measured parameters. The measured distance at which the exposure of the strobe is decreased, is defined as the strobe changeover distance. The strobe light control part sets the strobe changeover distance to be long as the focal length at photographing becomes long, so that the exposure of the main subject on the image surface can be kept proper.

REFERENCES:
patent: 4941009 (1990-07-01), Yoshida
patent: 5255047 (1993-10-01), Ishimaru et al.

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