Optics: measuring and testing – By shade or color – With color determination by light intensity comparison
Patent
1998-03-04
1999-10-05
Font, Frank G.
Optics: measuring and testing
By shade or color
With color determination by light intensity comparison
356402, 356405, 356407, 250306, G01N 2125
Patent
active
059633344
ABSTRACT:
A color measuring apparatus is provided with a radial illumination unit for projecting illumination light to a measurement object at a first illumination angle in a plurality of directions, a unidirectional illumination unit for projecting illumination light to the measurement object at a second illumination angle in a single direction, a unidirectional light receiving unit for receiving a light ray reflected at a first angle .theta.1 from the direction of regular reflection out of illumination light projected from the radial illumination unit and reflected by the measurement object, and a light ray reflected at a second angle .theta.2 from the direction of regular reflection out of illumination light projected from the unidirectional illumination unit and reflected by the measurement object, the second angle .theta.2 being larger than the first angle .theta.1, and a processing unit for calculating a color value at the first angle .theta.1 and a color value at the second angle .theta.2 based on an output of the unidirectional light receiving unit.
REFERENCES:
patent: 4583858 (1986-04-01), Lebling et al.
Ota Mitsunobu
Yamaguchi Wataru
Font Frank G.
Lauchman Layla
Minolta Co. , Ltd.
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