Patent
1980-12-11
1982-11-16
Gellner, Michael L.
354 34, 354 56, 354 59, G03B 1505
Patent
active
043592759
ABSTRACT:
A single lens reflex camera system capable of TTL flash output control of a flash unit which enables transmission light from the phototaking lens from a movable mirror device to a light receiving device when the mirror device is in one position and from a film surface to the light receiving device when the mirror is in a second position, the light receiving device generating a signal corresponding to the quantity of light it receives. A trigger circuit enables flash tube actuation upon film exposure and a control device controls the quantity of light emission of the tube in response to the output of the light receiving device. The trigger circuit is actuated when the mirror device is in the one position by an actuating device which includes circuitry for correcting the response of the control device of the output of the light receiving device in accordance with the difference, with respect to the same object, between the quantity of light incident on the light receiving device when the mirror device is in the one position and the quantity of light incident on the light receiving device when the mirror device is in the second position.
REFERENCES:
patent: 3726197 (1973-04-01), Hasegawa et al.
patent: 4064517 (1977-12-01), Maitani et al.
patent: 4097876 (1978-06-01), Uno et al.
patent: 4192590 (1980-03-01), Kitaura
Gellner Michael L.
Nippon Kogaku K.K.
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