Camera having light measuring mode change-over device with safet

Details Camera having light measuring mode change-over device with safet Camera having light measuring mode change-over device with safet

1982-11-12

1984-11-06

Perkey, William B.

354458, G03B 7093

Patent

active

044809026

ABSTRACT:
In a camera which permits the photographer to change one light measuring mode to another as desired according to the condition of the object to be photographed, when a shutter release action initiating operation and a light measuring mode change-over operation are concurrently performed, an inadequate exposure results from a certain length of time required for charging a storage capacitor if the camera is of the type which stores light measurement information through an analog storing process or for AD conversion if the camera is of the digital storing type; or an inadequate exposure results from a control action on the shutter if the camera is of the type requiring no process for storing the information such as a camera of the type measuring a light reflected by the film surface. This problem is solved by a safety device which inhibits a light measuring mode change-over action at least until completion of a process of storing light measurement information after a shutter release action is initiated in the case of the light measurement information storing type or inhibits the change-over action during a shutter control action if the camera is of the type which measures the light reflected by the film surface, etc. in a mode called the TTL direct metering mode without requiring any process of storing light measurement information.

REFERENCES:
patent: 4106033 (1978-08-01), Nakamoto et al.

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