Cross-fading color filter and system

Optical: systems and elements – Light interference – Electrically or mechanically variable

Patent

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Details

359892, 359589, 362277, 362293, 362319, G02B 528, F21V 900

Patent

active

058255486

ABSTRACT:
A color filter plate includes a continuously-variable dichroic filter coating constituting a variable band-pass or variable band-reject filter having a spatially-modulated variable-density pattern formed in the coating, and provides continuously-variable hue and saturation characteristics along separate gradient axes. A color filter assembly includes a variable band-pass and a variable band-reject filter mounted in a co-planar arrangement, providing a continuous range of color filtration for spectral and non-spectral colors. A color filter mechanism includes a color filter assembly having either a rectangular arrangement or a circular arrangement of co-planar, continuously-variable band-pass and band-reject filters mounted in a motorized carriage. One mechanism provides two-axis translation of the rectangular color filter assembly while another mechanism provides translation and rotation of the circular color filter assembly. A light projection system comprising a lamp with a reflector and a lens includes a color filter mechanism having co-planar, continuously-variable band-pass and band-reject filters supported by a motorized carriage mounted in a region where the beam diameter is small.

REFERENCES:
patent: 3416864 (1968-12-01), Keahl et al.
patent: 5126886 (1992-06-01), Richardson et al.
patent: 5426576 (1995-06-01), Hewlett
patent: 5453883 (1995-09-01), Chazallet

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