Luminance controlled indicator in camera view finder

Details Luminance controlled indicator in camera view finder Luminance controlled indicator in camera view finder

1975-05-27

1977-02-01

Hartary, Joseph W.

Radiant energy

Ionic separation or analysis

Static field-type ion path-bending selecting means

250205, 354 60A, 354 60L, G03B 1720, G01J 132

Patent

active

040064859

ABSTRACT:
An automatically light adjusted luminous indicator observable through a camera view finder includes a photoconductor exposed to the camera incident light and either constitutes or controls the resistance component of a frequency controlling RC network of a relaxation oscillator. The output of the relaxation oscillator controls a bi-stable multivibrator whose output is coupled through a switching transistor to the primary of a transformer whose secondary is connected to a light emitting member such as an electroluminescent device or a light emitting diode. The parameters of the network are adjusted so that the luminosity of the indicator and viewed image are about equal or within any desired ratio range. The photoconductor may also control an exposure control network.

REFERENCES:
patent: 3366834 (1968-01-01), Potter
patent: 3473084 (1969-10-01), Dodge

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