Photographic enlarger
AssigneeCiba-Geigy Corporation
InventorsMalcolm G. Brockwell, David B. Harrington
Life of this patent
Estimating the term…
Abstract
In the light path of a photographic enlarger, a supplementary light source is arranged in such a way that an image thereof is formed by the condenser in the focal plane of the imaging lens but outside the range covered by the latter. If the original to be printed has scratches, these deflect at least a part of the light, which reaches them from the supplementary light source into the lens. As a result, that proportion of the actual printing light supplied by the printing light source which is deflected past the lens by the scratches is at least partially compensated. The image of the scratches on the printing material is virtually invisible.
Claims10
A photographic enlarger with a printing light source which, via a condenser, illuminates a plane for receiving the original to be printed, an image of said original being formed in a printing plane by means of a lens, the image of the printing light source in the focal plane of the lens being at least not substantially larger than the range covered by the lens, the improvement comprising a supplementary light source which is positioned in such a way that, when no original to be printed is in position, an image of the supplementary light source is formed by the condenser in the focal plane of the lens but outside the range covered by the latter.
Dependencies are inferred from the claim text.