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Spectral Manipulation Device

IP.com Disclosure Number: IPCOM000094847D
Original Publication Date: 1965-Jun-01
Included in the Prior Art Database: 2005-Mar-06
Document File: 2 page(s) / 35K

Publishing Venue

IBM

Related People

Schomburg, JF: AUTHOR

Abstract

The color balance of a light source can be selectively altered to achieve a desired spectral distribution by separating the light into its component colors, selectively attenuating the component frequencies, and recombining the light. This is achieved, as shown in the upper drawing, by employing a prism to effect the spectral dispersion, inserting a film strip or strips in the path of the dispersed beams, and recombining the beams by a prism complementary to the first prism. The film strip has a spatially distributed gray scale to attenuate the components in the required amounts.

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Spectral Manipulation Device

The color balance of a light source can be selectively altered to achieve a desired spectral distribution by separating the light into its component colors, selectively attenuating the component frequencies, and recombining the light. This is achieved, as shown in the upper drawing, by employing a prism to effect the spectral dispersion, inserting a film strip or strips in the path of the dispersed beams, and recombining the beams by a prism complementary to the first prism. The film strip has a spatially distributed gray scale to attenuate the components in the required amounts.

As shown in the lower drawing, the film strips can be made absorptive or transmissive and combined to provide selective transmission of only a few desired frequencies. These films can be fabricated by inserting unexposed film in the dispersion field and introducing light of the required spectral distribution. This method of preparation obviates the laborious step of computing the required amplitudes and the cutting of masks.

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