Photographic exposure setting device

Details Photographic exposure setting device Photographic exposure setting device

1975-05-19

1977-08-09

Hix, L. T.

354 51, 354 53, 354 60L, G03B 708

Patent

active

040415040

ABSTRACT:
Photographic exposure setting device comprising an exposure time setting unit and two units for indicating insufficient and excessive illumination intensity which determine the degree of illumination of an object being photographed, these units being constructed in the form of three threshold amplifiers interconnected by means of transistor switches, each amplifier having at its input integrating timing RC circuits. The first integrating timing RC circuit has a variable time constant value which depends upon the intensity of light received by its photoresistor from the object being photographed. The remaining RC circuits have fixed time constant values and are correspondingly adjusted for a minimum and maximum time of exposure in non-automatic photography. A comparison between the variable time constant value and the fixed time constant values makes it possible to accurately determine favorable conditions for photography and indicate them with the aid of signal lamps.

REFERENCES:
patent: 3782254 (1974-01-01), Matsuzaki et al.
patent: 3792648 (1974-02-01), Ishiguro
patent: 3978499 (1976-08-01), Nagaoka et al.

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