Illuminating light source apparatus for photographic printer

Details Illuminating light source apparatus for photographic printer Illuminating light source apparatus for photographic printer

1997-09-04

1999-03-30

Moses, Richard

Photocopying

Projection printing and copying cameras

Illumination systems or details

355 67, G03B 2754, G03B 2772

Patent

active

058895817

ABSTRACT:
A compact and inexpensive illuminating light source apparatus for a photographic printer, which is designed so that infrared rays emitted from a lamp are reused without dissipating as heat, thereby considerably improving the light source efficiency, and that color and other characteristics are not affected by replacement of the lamp, and further that the apparatus is easy to produce and simple in arrangement. All the components of light that is emitted from a filament (FM) of a lamp (S) are reflected by a total internal reflection reflector (R1) having a paraboloid of revolution, and the resulting parallel beam of light is perpendicularly incident on an infrared reflecting plate (RP). The visible light component in the incident light passes through the infrared reflecting plate (RP) and is used to print a film. The infrared component is reflected by the infrared reflecting plate (RP) so as to return to the filament (FM) of the lamp (S), traveling backwards along the optical path. Accordingly, the heating efficiency of the lamp (S) improves to such an extent that the greater part of the electric energy can be appropriated for visible light, which is useful for printing. Thus, it becomes possible to realize a high-intensity visible light emitting light source even with a lamp of relatively low electric power consumption.

REFERENCES:
patent: 4095881 (1978-06-01), Maddox

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