Illumination – Light fiber – rod – or pipe – With ventilating or cooling or thermally controlled light guide
Patent
1997-08-06
1999-10-19
Tso, Laura K.
Illumination
Light fiber, rod, or pipe
With ventilating or cooling or thermally controlled light guide
385 43, 385901, 362558, F21V 800
Patent
active
059676531
ABSTRACT:
This invention applies to the field of light projectors for graphics media, such as movie film, projection slides, liquid crystal cells and fiber optic arrays. High light levels have not been possible with prior art projectors due to plastic media aging and melting in the heat of concentrated light; due to optical inefficiencies in converting circular lamp beams to a rectangular medium format; and due to mismatches between the numerical aperture of the lamp to the graphics media. The present invention solves the heating problem by providing a projector having an elongated, heat absorbing glass coupler between the light source and the graphics medium; it solves the optical inefficiency problem by providing the coupler with a circular light entrance end and a rectangular exit end; and it solves the numerical aperture problem by providing the coupler with a generally parabolic shape that collimates extreme off-axis light rays.
REFERENCES:
patent: 4076378 (1978-02-01), Cole
patent: 5099399 (1992-03-01), Miller et al.
patent: 5233679 (1993-08-01), Oyama
patent: 5764845 (1998-06-01), Nagatani et al.
patent: 5845024 (1998-12-01), Tsushima et al.
Miller Jack V.
Miller Ruth Ellen
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