Automatic exposure control apparatus for a camera

Details Automatic exposure control apparatus for a camera Automatic exposure control apparatus for a camera

1991-10-07

1993-06-08

Gellner, Michael L.

354480, G03B 7099, G03B 700

Patent

active

052183971

ABSTRACT:
An automatic exposure control apparatus for a camera for metering a reflected light from a film surface in a flash photographing mode and stopping a light emission in accordance with the comparison comprises a flashing device for providing a preliminary light emission, an early main light emission and a late main light emission, a flashing control unit for controlling the flashing device to provide the preliminary light emission in a closed state of a shutter curtain and providing the early main light emission and the late main light emission in sequence after the shutter curtain has been opened, a metering unit for metering a reflected light from the shutter curtain surface at the preliminary light emission and metering a reflected light from the film surface at the early main light emission and the late main light emission, and an exposure control unit for comparing a metering output of the metering device for the preliminary light emission and a metering output for the early main light emission, determining an exposure condition in accordance with the comparison and stopping the late main light emission after the start of the late main light emission in accordance with the exposure condition.

REFERENCES:
patent: 4303318 (1981-12-01), Kitaura et al.
patent: 4343541 (1982-08-01), Mizokami
patent: 4422743 (1983-12-01), Izumi et al.
patent: 4460262 (1984-07-01), Mizokami
patent: 4477170 (1984-10-01), Yamada et al.

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