Optical filter in the form of a rectangular parallelepiped havin

Details Optical filter in the form of a rectangular parallelepiped havin Optical filter in the form of a rectangular parallelepiped havin

1990-12-07

1991-12-10

Henry, Jon W.

Optical: systems and elements

Absorption filter

359890, G02B 522, G02B 104

Patent

active

050712276

ABSTRACT:
An optical filter is formed as a rectangular parallelepiped having a plurality of beveled edges formed thereon, preferably three non-intersecting beveled edges formed at an angle of 45 degrees. The filter is formed of a clear, transparent, durable, shock-resistant material, preferably abrasion-resistant Lucite.TM. acrylic resin (trademark of the Du Pont Corporation) impregnated with a subtractive dye. The material has a refractive index closely matching that of glass, but is tougher and more shock resistant. The filter dimensions are in the ratio of small whole integers, specifically 2:3:4, for example, 1.times.1.5.times.2 inches. The beveled edges increase the residence time of light within the filter. By positioning differently colored filters of different orientations in optical series, many different hues may be produced.

REFERENCES:
patent: 4684231 (1987-08-01), Athy
patent: 4740059 (1988-04-01), Boldt
patent: 4865424 (1989-09-01), Zupanick et al.
patent: 4974937 (1990-12-01), Haigo et al.

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