Strobe device

Details Strobe device Strobe device

1998-09-09

1999-11-16

Perkey, W. B.

Photography

Flash system responsive to focal length or distance

396157, 348229, 348371, G03B 1503, H04N 5222, H04N 5235

Patent

active

059872616

ABSTRACT:
A strobe device including a preparatory light radiator for generating a fixed amount of preparatory light a plurality of times to set an amount of actual light to be generated when radiating supplementary light onto a subject during photographing; an image pickup element for receiving a fixed amount of preparatory light, generated a plurality of times by the preparatory light radiator, and photoelectrically converting light reflected from the subject; an amplifier for amplifying the photoelectrically converted signal during the plurality of times of generating preparatory light, by an amplification factor which differs for each generation of preparatory light; a detector for detecting whether the average level of signals being output from the amplifier, for each generation of preparatory light, is within a predetermined range; and a calculator for calculating an amount of actual light to be generated based on signals output from the amplifier when the detector has determined that the average level of signals output from the amplifier is within the predetermined range.

REFERENCES:
patent: 4354751 (1982-10-01), Izumi et al.
patent: 4768876 (1988-09-01), Okino
patent: 4903136 (1990-02-01), Iketani
patent: 4951077 (1990-08-01), Kaneko et al.
patent: 4954897 (1990-09-01), Ejima et al.
patent: 5097340 (1992-03-01), Tanabe et al.
patent: 5410225 (1995-04-01), Ishi et al.
patent: 5822624 (1998-10-01), Fukuhara et al.
patent: 5860029 (1999-01-01), Ichikawa et al.

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