Device for indicating condition of exposure in an automatic cont

Details Device for indicating condition of exposure in an automatic cont Device for indicating condition of exposure in an automatic cont

1977-06-21

1978-10-24

Gellner, Michael L.

354 60L, 354128, G03B 1505

Patent

active

041224655

ABSTRACT:
An automatic control type electronic flash unit includes flashlight generator, a metering device for measuring the quantity of light emitted from the flashlight generator and reflected by an object to be photographed, a first detector for detecting the output of the metering device and generating a proper output when the output corresponds to a quantity of light which provides a proper exposure, and apparatus for discontinuing the flashlight generation of the flashlight generator in response to the proper output, a second detector for generating an over-exposure output when the output of the metering device related to the quantity of the reflection, by the object, of the flashlight generated during the time from the generation of the proper output until the discontinuation of the flashlight generation of the flashlight generator reaches a predetermined value, and an indicator operable by an over-exposure output to indicate an over-exposure.

REFERENCES:
patent: 3950767 (1976-04-01), Matsui
patent: 3993928 (1976-11-01), Wilwerding
patent: 4051491 (1977-09-01), Toyoda

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