Electric lamp and discharge devices: systems – Pulsating or a.c. supply – Plural load device systems
Patent
1980-01-17
1982-03-02
Hix, L. T.
Electric lamp and discharge devices: systems
Pulsating or a.c. supply
Plural load device systems
354 34, 315151, 315241P, G03B 716, G03B 1505, H05B 4114
Patent
active
043176208
ABSTRACT:
A photographic exposure and flash fire control system initially measures ambient scene light and subsequently utilizes the results of that measurement to control the amount of artificial illumination provided during the exposure interval. The initial measurement of ambient scene light below a first select level provides for a maximum flash output while conversely the initial measurement of ambient scene light above a second select level greater than the first select level provides for minimum flash output. The initial measurement of ambient scene light between the aforementioned first and second levels provides for a flash output which progressively varies between the aforementioned minimum and maximum outputs in inverse corresponding relation with respect to the progressive variation of measured ambient scene light between its first and second select levels.
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Coppa Richard J.
Lim James K.
Rodriguez Marie T.
Hix L. T,.
Perkey William B.
Polaroid Corporation
Roman Edward S.
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