Optics: measuring and testing – By shade or color – Tristimulus examination
Patent
1998-09-01
1999-07-27
Evans, F. L.
Optics: measuring and testing
By shade or color
Tristimulus examination
356406, 250226, 358509, G01J 350
Patent
active
059299991
ABSTRACT:
A light source used to measure color involves associating a light emitter that emits light having a first spectral distribution with a wavelength-shifting medium that absorbs the emitted light and re-emits the light at a second spectral distribution that approximates one of the three color curves of the CIE standard X, Y, and Z tristimulus functions. Preferably, the light source involves associating known blue light sources with a green-converting lens and a red-converting lens where materials integrated into the lenses, preferably fluorescent organic dyes, absorb the blue light and re-emit green and red light respectively. The blue light, the converted green light, and the converted red light, are generated to closely match the CIE standard X, Y, and Z tristimulus functions in order to measure color in a manner that correlates to the color sensitivity of the human eye. The blue light used to generate the blue, green, and red light is preferably generated from Galium Nitride based LEDs that are encased in epoxy lenses. The flourescent organic dyes used to create the green and red light are mixed into the epoxy lenses that encapsulate the respective blue light emitting LEDs.
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patent: 5753906 (1998-05-01), Gennetten
Evans F. L.
Hewlett--Packard Company
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