Radiant energy – Radiant energy generation and sources – Plural radiation sources
Patent
1988-06-20
1989-09-12
Berman, Jack I.
Radiant energy
Radiant energy generation and sources
Plural radiation sources
250504R, 250504H, 250333, 354413, 430494, H05B 4130
Patent
active
048662852
ABSTRACT:
An infrared flash unit, for use with camera employing infrared film, is mounted in a housing having a base configured to fit on the normal flash unit attachment of a standard camera. The housing has a front panel with an array of eight individual reflectors, each having an infrared light emitting diode or laser diode in it. A power supply is connected through a pulse driver circuit to the diodes, each of which are connected in series with a corresponding switch. The diode and switch combination are connected in parallel with one another and in series with the pulse driver circuit. Different combinations of diodes are selected for operation in accordance with the shutter speed and range of the camera. The pulse driver circuit supplies energizing pulses to the selected diodes at a repetition rate and duty cycle selected to match the primary infrared wave length of the diodes and the film used in the camera to reduce fogging due to background infrared light.
REFERENCES:
patent: 3752983 (1973-08-01), Yanez
patent: 4610525 (1986-09-01), Yoshida et al.
patent: 4707595 (1987-11-01), Meyers
Berman Jack I.
Murasa International
Ptak LaValle D.
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