Warning device for a camera

Details Warning device for a camera Warning device for a camera

1976-03-15

1977-09-13

Adams, Russell E.

354 23D, 354 53, 354 60A, G03B 700, G03B 1720

Patent

active

040486443

ABSTRACT:
The warning device for a camera has an operation circuit for determining proper exposure condition of the shutter time according to the informations of the brightness of the object, the diaphragm aperture of the objective and the film sensitivity, a manually operable circuit for manually setting the condition of the shutter time and an optical indicating circuit operated by the manually operable circuit for digitally indicating the condition of the shutter time set by the manually operable circuit.
The warning device is provided with a comparison circuit with its one input connected to the output of said operation circuit and with its other input connected to the manually operable circuit, and an oscillator with its input connected to the output of the comparison circuit and with its output connected to the optical indicating circuit so as to cause winking of the optical indication of the optical indicating circuit, the duty ratio of pulses of the oscillator being varied depending upon the output of the comparison circuit so as to render the duty ratio to be increased to 1 as the output of the manually operable circuit reaches that of the operation circuit so that the degree of non-coincidence of the outputs of the operation circuit and the manually operable circuit is easily found out while continuous optical indication of the proper exposure condition of the camera is achieved.

REFERENCES:
patent: 3956758 (1976-05-01), Numata et al.
patent: 3967288 (1976-06-01), Yamamoto

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