Electronically controlled optical color correction system for a camera
OwnerLloyd A. Wooldridgeinventor
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Abstract
The present invention covers automatic and manual control of the color of light striking film in a camera by electrically manipulating the color purity of one or more optical color correction filter elements made of clear and dyed dichroic liquid crystals that do not significantly disperse light being transmitted through the filters. In a preferred embodiment for a camera the opto-electrical and electrical components of the invention are designed to provide automatic correction of incident light on a photographic subject to match the color temperature standard to which the film was manufactured.
Claims14
An electronically controlled optical color correction unit for a camera comprising:
- 1) a camera body;
- 2) a central processor unit in said camera body;
- 3) a diffuser means in said camera body to diffuse incident light through a red filter and through a blue filter;
- 4) blue light photosensitive diodes that receive light through said blue filter and converts said light to a first electronic signal that feeds to said central processor unit;
- 5) red light photosensitive diodes under said red filter that converts said light to a second electronic signal that feeds to said central processor unit;
- 6) a film temperature determination means to feed a third electronic signal to said central processor unit;
- said central processor unit then using said first electronic signal, said second electronic signal and said third electronic signal to calculate proper output voltages to apply across an essentially transparent, electronically controlled variable color filter means that changes purity of yellow and blue colors to adjust exit light to match said film color temperatures;
- 7) a battery in said camera to power said central processing unit.
An electronically controlled optical color correction unit comprising:
- 1) a camera body;
- 2) a housing and a fastener to fasten said housing to said camera body;
- 3) a central processor unit in said housing;
- 4) blue light photosensitive diodes that receive light through said blue filter and converts said light to a first electronic signal that feeds to said central processor unit;
- 5) red light photosensitive diodes under said red filter that converts said light to a second electronic signal that feeds to said central processor unit;
- 6) a film color temperature determination means to feed a third electronic signal to said central processor unit;
- said central processor unit then using said first electronic signal, said second electronic signal and said third electronic signal to calculate proper output voltages to apply across an essentially transparent, electronically controlled variable color filter means that changes purity of yellow and blue colors to adjust exit light to match said film color temperatures;
- 7) a battery in said housing to power said central processor unit.
Dependencies are inferred from the claim text.