Optics: measuring and testing – By shade or color
Patent
1997-07-17
2000-02-29
Hantis, K. P.
Optics: measuring and testing
By shade or color
G01J 346
Patent
active
060316179
ABSTRACT:
A colorimeter for reading color bars of printed sheets or the like includes a longitudinally extending base including a paper stop along which a sheet to be tested for color may be positioned. An autonomously operating colorimeter head is moved along the base in a direction parallel to the edge of the sheet by means of an electric motor mounted on the base and driving an helical thread lead screw engaging an X-axis carriage supporting the head. The head is moved by operation of the lead screw in a direction parallel to the edge of the sheet, referred to as the direction of the X-axis. The head includes an electric motor and a Y-axis transport supporting an optics unit. The optics unit is moved within the head in a direction parallel to a Y-axis, extending perpendicularly to the X-axis. The optics unit is preferably a spectrophotometer including a rotating wheel provided with a plurality of individual filters, spaced apart along the periphery of the wheel. The individual filters each pass light of a predefined wavelength onto a single photodetector and the signal derived from the photodetector is integrated over a period of time to provide an output signal representative of the intensity of a particular wavelength.
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Baker Douglas V.
Berg Bernard J.
Boes Thomas J.
Bowden David R.
Zandstra Lawrence D.
Hantis K. P.
X-Rite Incorporated
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