Incident metering electronic flash control

Details Incident metering electronic flash control Incident metering electronic flash control

1979-07-09

1981-05-05

La Roche, Eugene

Electric lamp and discharge devices: systems

With radiant energy sensitive control means

Load device irradiating the radiant energy responsive device

250214P, 354 33, 354128, H05B 4132

Patent

active

042661633

ABSTRACT:
There is disclosed herein an electronic system and method for metering the incident light on a subject being photographed, some or all of which light emanates from an electronic flash unit, and for storing an incident light value for use in controlling the electronic flash unit during the taking of subsequent photographs of the subject. An exemplary system includes a remote light sensor which can be placed at or near the subject being photographed for measuring the light incident on the subject during a "test flash" from the electronic flash unit so as to enable the storage of an incident light value. This incident light value may comprise a signal representing the duration of the flash or a signal proportional to the drop in energy of the supply source of the electronic flash unit, both of which are proportional to the quantity of incident light. When a subsequent flash of light is emitted by the electronic flash unit for taking a photograph, an electrical signal, which may represent the energy source change, is monitored and compared with the stored value in order to derive a quench or termination signal for terminating the flash of light from the electronic flash unit.

REFERENCES:
patent: 3823410 (1974-07-01), Tokutomi et al.
patent: 3836924 (1974-09-01), Kawasaki
patent: 3842428 (1974-10-01), Kawasaki
patent: 3868701 (1975-02-01), Kawasaki

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