Patent
1990-07-06
1992-03-03
Hix, L. T.
3541451, 3541491, G03B 1503
Patent
active
050936816
ABSTRACT:
A flash apparatus which is detachably mounted on a camera main body is operated in a light emission mode of an open control scheme, in which the light emission amount of the light-emitting portion is controlled by a preset guide number, and in a light emission mode of an automatic control scheme, in which the light emission amount of the light-emitting portion is controlled by a metering result obtained by metering light reflected by an object to be photographed. The flash apparatus includes one of the following switches a bounce state detection switch which is turned on when the light emission axis of the light-emitting portion is inclined with respect to the optical axis of a photographing lens, an OFF-camera detection switch which is turned on when the flash apparatus is to be used while it is detached from the camera main body, and a converter mounting detection switch which is turned on when a converter is mounted on the photographing lens. A CPU of the flash apparatus forcibly switches the apparatus to the light emission mode of the automatic control scheme when any one of the detection switches is turned on.
REFERENCES:
patent: 4078240 (1978-03-01), Kaneko et al.
patent: 4494850 (1985-01-01), Katsuma
patent: 4857951 (1989-08-01), Nakajima et al.
Matsuzaki Minoru
Tokui Masaki
Gray David M.
Hix L. T,.
Olympus Optical Co,. Ltd.
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