Portable scanning colorimeter

Details Portable scanning colorimeter Portable scanning colorimeter

1993-04-12

1994-11-29

Evans, F. L.

Optics: measuring and testing

By shade or color

356405, 356407, G01J 351

Patent

active

053694945

ABSTRACT:
A portable colorimeter housing has an upper portion which is mounted on a lower portion in a cantilever fashion and is adapted to receive sheets larger than the device for purposes of obtaining tri-stimulus color measurements. An adjustable paper guide determines the distance that a sheet is inserted between upper and lower plates. A sheet to be measured inserted in the opening will operate a micro switch which activates a motor operative to advance the sheet between a motor-driven drive wheel in the lower plate and an idler roller in the upper plate. Transmittance or reflectance measurements are taken by means of photodetector cells including colorimetric filters. A user programmable processor performs pattern recognition and control functions. An optical housing assembly mounted on the upper plate includes a substantially cylindrical body provided with a horizontally extending channel and a mounting bar disposed in the channel is insulated from the cylindrical housing by air space except in peripheral areas of the cylindrical portion, thereby conducting heat generated by the high intensity light source to an area away from heat sensitive filters.

REFERENCES:
patent: 4053235 (1977-10-01), Hampton et al.
patent: 4080075 (1978-03-01), Berg
patent: 4125329 (1978-11-01), French et al.
patent: 4402611 (1983-09-01), Yuasa
patent: 4505589 (1985-03-01), Ott et al.
patent: 4773761 (1988-09-01), Sugiyama et al.
patent: 5062714 (1991-11-01), Peterson et al.
patent: 5073028 (1991-12-01), Bowden et al.
patent: 5118183 (1992-06-01), Cargill et al.
patent: 5206493 (1993-04-01), Anderson, Jr. et al.

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