Optics: measuring and testing – By shade or color – With color transmitting filter
Patent
1999-01-14
1999-11-23
Evans, F. L.
Optics: measuring and testing
By shade or color
With color transmitting filter
356420, 250226, G01J 351
Patent
active
059910453
ABSTRACT:
A color analyzer is capable of determining the color property of a test object, and includes a light collector having a first end formed with a test opening and adapted to be placed in juxtaposition with the test object, a second end, and a light channel extending from the test opening to the second end. A lighting unit is mounted on the light collector, and is operable in order to generate light outputs of different wavelengths. A color filter device is movably disposed in the light collector, and includes a transparent filter and three color filters. A filter-shifting unit is associated with the color filter device, and is operable so as to move the color filter device in the light collector in order to align the filters within the light channel. A photoelectric sensor produces an electric output signal corresponding to the light leaving the color filter device. A signal-processing unit is connected to the photoelectric sensor to process the output signal of the photoelectric sensor in order to determine the color property of the test object.
REFERENCES:
patent: 2358020 (1944-09-01), Miller
patent: 3910701 (1975-10-01), Henderson et al.
Chroma Ate Inc.
Evans F. L.
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