Automatic exposure control system for single reflex camera

Details Automatic exposure control system for single reflex camera Automatic exposure control system for single reflex camera

1978-05-11

1980-05-20

Gellner, Michael L.

354 59, G03B 700

Patent

active

042036607

ABSTRACT:
A camera which permits change-over between different light measuring systems is disclosed. The camera includes a first light measuring element which measures light coming from an object to be photographed and an operational amplifier responsive to the element. A light measurement information producing circuit is included for producing a light measurement information signal for exposure computation. A change-over device is connected between the light measurement information producing circuit and the operational amplifier. The change-over device is arranged to be shiftable between a first position wherein the operational amplifier is connected to the light measurement information producing circuit and a second position wherein the operational amplifier is not so connected. An accessory device is attachable to the camera body. The accessory device includes a second light receiving element for measuring light from the object within a light measurement range different from that of the first light receiving element and another operational amplifier responsive thereto. A terminal is responsive to the signal from the latter operational amplifier. The terminal is disposed at the second position of the change-over device so that the signal from the latter operation is applied to the light measurement information producing circuit when the change-over device is in this position.

REFERENCES:
patent: 3310679 (1967-03-01), Babish
patent: 3526183 (1970-09-01), Hartl
patent: 3605590 (1971-09-01), Kitai
patent: 3641902 (1972-02-01), Kikuchi et al.
patent: 3693527 (1972-09-01), Matsuda
patent: 3745902 (1973-07-01), Taguchi
patent: 3812499 (1974-05-01), Hayashi et al.
patent: 3829867 (1974-08-01), Ono

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