Light pipe spectral filter

Details Light pipe spectral filter Light pipe spectral filter

1994-06-22

1995-05-09

Gillner, M. L.

Photocopying

Projection printing and copying cameras

Illumination systems or details

355 1, 355 71, 355229, 355238, G01J 100

Patent

active

054144892

ABSTRACT:
An elongated light source of the type employed in a document scanner for forming a line of uniform intensity, diffuse illumination at a document scanning plane. The light source has a longitudinally extending aperture for generating a line of light aligned with the light entrance end face of a generally planar, light conducting pipe. The light conducting pipe conducts light through its length and emits the light at a light exiting end face in proximity to a document scanning plane. The emitted light is spectrally filtered within the light pipe by the selected colored material thereof for absorbing unwanted wavelengths and/or by shaping the light pipe and/or by use of dichroic filter coatings for reflecting unwanted light wavelengths. The light pipe may be configured with a slanted light exiting end face or in two sections each with a mating slanted end face, having dichroic filter coatings on one or both slanted end faces, fitted together end-to-end to form the light conducting pipe and to selectively effect filtering of the scan line of light. The spectral filtering allows the configuration of the elongated light source as a light integrator with a lamp positioned within the light integrating cavity for maximizing efficiency while achieving color balance.

REFERENCES:
patent: 4321030 (1982-03-01), Kramer
patent: 4868383 (1989-09-01), Kurtz et al.
patent: 5079678 (1992-01-01), Parker
patent: 5103385 (1992-04-01), Federico et al.
patent: 5155596 (1992-10-01), Kurtz et al.
patent: 5215370 (1993-06-01), Kaplan
patent: 5241459 (1993-08-01), Kaplan et al.

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