|5812246||Photographic contact printing device|
A photographic contact printing device has a point-like light source (17) and two uni-directionally curved parabolically cylindrical mirrors (18, 19) the axis of curvature (22, 23) of which are perpendicular to each other, and one axis (23) being parallel...
|4415958||Device for illuminating transparencies|
A lighting device for uniformly illuminating transparencies. The device comprises an open-ended, rectangular parallelepiped-shaped housing having specularly reflective interior surfaces and a partially reflecting/diffusing opal glass screen positioned ove...
|4035078||Method and apparatus for increasing contrast and resolution from low density film|
Photograph film negatives with specular densities so low that they are not usable with transmitted light, e.g., densities below 0.3, may be used with substantially increased contrast and resolution when illuminated with a beam of light which is scattered ...