Electric lamp and discharge devices: systems – Pulsating or a.c. supply – Plural load device systems
Patent
1989-05-19
1990-08-21
Perkey, W. B.
Electric lamp and discharge devices: systems
Pulsating or a.c. supply
Plural load device systems
354416, 354433, 315241P, 315151, G03B 1505, H05B 4114
Patent
active
049510800
ABSTRACT:
A light emission controlling device for an electronic flash apparatus includes a first photometric unit for metering a first region of an object field in a weighted manner and outputting first photometric informaiton with a lapse of time; a second photometric unit for metering a second region of the object field in a weighted manner and outputting second photometric information with a lapse of time; a comparing unit for comparing the first photometric information with the second photometric information; and a controlling unit for determining timing for outputting a light emission stop signal on the basis of the relationships between the first photometric information and the second photometric information.
REFERENCES:
patent: 3667357 (1972-06-01), Matsuda
patent: 3792484 (1974-02-01), Tsujimoto et al.
patent: 4329623 (1982-05-01), Hattori
patent: 4331400 (1982-05-01), Brownstein et al.
patent: 4589756 (1986-05-01), Saegusa
patent: 4660956 (1987-04-01), Yokonuma
patent: 4769666 (1988-09-01), Kumakura
patent: 4809030 (1989-02-01), Takagi et al.
Sakamoto Hiroshi
Yokonuma Norikazu
Nikon Corporation
Perkey W. B.
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