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US 5,353,080 AGranted
Exposure-equalizing system for photographic images
OwnerErnest H. Christmaninventor
Life of this patent
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Abstract
A transparent photochromic medium is placed before the film or film-equivalent of a camera or photographic imaging device such that a light exposure of the medium temporarily darkens it according to the different light values in the image. A subsequent exposure of the film is influenced by the intervening photochromic device so that the range of light is moderated, reducing over- and under-exposure of areas of the film.
Claims2
An image control device in a photographic apparatus comprising:
- (a) a transparent photochromic medium that is interposed in the internal optical path, and
- (b) a mirror before said medium that transmits light coming from anterior to posterior but reflects light coming from posterior to anterior, and
- (c) a mirror behind said medium that reflects light forward, and
- (d) the mirrors in multiple parts which fit together into the optical path when brought together, and
- (e) the photochromic medium in multiple parts which fit together into the optical pathway when brought together.
2 more elements
Dependencies are inferred from the claim text.