Light source for photographic color printers
OwnerRoy A. Clappinventor
Life of this patent
Estimating the term…
Abstract
A light source for use in exposing photographic material through a negative. The source includes a plurality of lamps, one appropriate to each emulsion layer of the material to be exposed. Each lamp has a reflector projecting a light stream through a dichroic filter which limits the energy of the stream so that it acts on a single layer. The separate streams are then combined into a single stream which is further treated to eliminate rays exceeding a predetermined angle. Cut off blades may be used to terminate the projection of any one or more of the individual streams for certain definite times depending on the desired exposure of each separate emulsion layer.
Claims13
For use with apparatus for exposing color photographic material through a negative, said material having a plurality of emulsion layers, a light source device having a plurality of lamps, one for each emulsion layer, each lamp having an integral reflector with a solid collection angle greater than 180 degrees designed to project a light stream composed of substantially parallel rays, said parallel rays being combined with the direct divergent fan of rays emitted by the lamp filament to form composite light streams, a dichroic filter positioned in the path of each of said composite light streams, each dichroic filter being adapted to limit the spectral energy of the parallel rays to act exclusively on a single emulsion layer, means to combine these composite light streams into a single light stream, means to remove from this combined light stream rays that exceed a predetermined angle, and to form a printing light stream.
For use with apparatus for exposing color photographic material through a negative, said material having a plurality of emulsion layers, a light source device having a plurality of lamps, one for each emulsion layer, at least one having an integral reflector with a solid collection angle greater than 180 degrees designed to project a substantially collimated light stream, said light stream combined with the divergent fan of rays emitted by the lamp filament forming a composite light stream, a dichroic filter positioned normal to the collimated light component, said dichroic filter designed to limit the spectral energy of parallel rays to act exclusively on a single emulsion layer, means to remove from this light stream rays that exceed a predetermined angle from this composite light stream;
- at least one other lamp having an integral reflector providing a composite light stream, employing an absorption type filter to limit the spectral energy to act exclusively on another emulsion layer, and means to combine these composite light streams into a single light stream to form a printing light stream.
Dependencies are inferred from the claim text.