Electric lamp and discharge devices: systems – Condenser in the supply circuit – Condenser in shunt to the load device and the supply
Patent
1976-02-13
1977-05-03
La Roche, Eugene R.
Electric lamp and discharge devices: systems
Condenser in the supply circuit
Condenser in shunt to the load device and the supply
315151, 315155, 354 31, 354 34, H05B 4132
Patent
active
040216985
ABSTRACT:
In an automatic control apparatus for controlling the quantity of light from a flash device, a first photocell device, responsive to the light from the flash device, is serially connected with a second photocell device, responsive to light reflected from the photographic object, and the output from the second photocell device is integrated and used for energizing known apparatus for preventing the light generated by the flash device from reaching the photographic object to optimize the light illuminating the photographic object. The second photocell device has a lower output than the first photocell device, thereby enabling the output from the second photocell device to determine the light measurement. The first photocell functions as a gate in response to the direct light emission from the flash device to prevent spurious and undesirable actuation of the second photocell device.
The first and second photocell devices may each be phototransistors or photodiodes. A switching means may be connected in parallel with the second photocell device and actuated by the manual operation such that when the switch is closed the second photocell is deactuated, thereby enabling the flash device to operate in accordance with the manual operation. The light measuring means may be energized by a separate power source or by a regulated power source connected to the power source providing energy for the flash device.
REFERENCES:
patent: 2622229 (1952-12-01), Lord
patent: 3033988 (1962-05-01), Edgerton
patent: 3122677 (1964-02-01), Flieder
patent: 3350603 (1967-10-01), Erickson
patent: 3440938 (1969-04-01), Stimson et al.
patent: 3758817 (1973-09-01), Elliott
patent: 3906516 (1975-09-01), Harvey
La Roche Eugene R.
Minolta Camera Kabushiki Kaisha
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