Electric lamp and discharge devices: systems – Pulsating or a.c. supply – Plural load device systems
Patent
1989-08-07
1991-01-15
Perkey, W. B.
Electric lamp and discharge devices: systems
Pulsating or a.c. supply
Plural load device systems
315241P, 315151, G03B 1505, H05B 4136
Patent
active
049857258
ABSTRACT:
An auto-flash photographing system includes a flash lamp unit, a photometry unit for detecting light reflecting from a subject of interest, a reference setting unit, a comparator, and a trigger unit. The flash lamp is once triggered to emit a flash, and the light detected by the photometry unit is compared with a reference value defined by the reference setting unit by the comparator. If the detected light is lower than the reference value, it indicates underexposure so that the trigger unit once again triggers the flash lamp. In this manner, the flash lamp is fired more than once while a shutter is set in a fully open condition until an optimal exposure condition is attained. In another structure, a plurality of flash lamps are provided they may be fired at the same time and extinguished separately or they may fired one after another in sequence until a desired exposure condition for phototaking is obtained.
REFERENCES:
patent: 3438766 (1969-04-01), Biber
patent: 3758817 (1973-09-01), Elliott
patent: 3846811 (1974-11-01), Nakamura et al.
patent: 4255046 (1981-03-01), Corona
patent: 4344680 (1982-08-01), Ishida et al.
patent: 4349260 (1982-09-01), Ishida et al.
patent: 4398127 (1983-08-01), Bahn et al.
patent: 4422743 (1983-12-01), Izumi et al.
patent: 4551011 (1985-11-01), Yuasa et al.
patent: 4591762 (1986-05-01), Nakamura
Perkey W. B.
Ricoh & Company, Ltd.
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