Device for color distinction

Details Device for color distinction Device for color distinction

1987-03-26

1988-10-11

Evans, F. L.

Optics: measuring and testing

By shade or color

Tristimulus examination

250226, 356417, 356425, G01J 351

Patent

active

047767022

ABSTRACT:
A half mirror and two dichroic mirrors having different characteristics are provided on an optical path of measurement light from an object, and four sensing devices are provided on optical paths of reflected or transmitted light from these mirrors. Calculations are performed on the outputs of the four sensing devices, and the resultant values are compared with parameters stored in a microcomputer to thereby effect color distinction.

REFERENCES:
patent: 3527540 (1970-09-01), Bowker et al.
patent: 4494876 (1985-01-01), Van Wandelen

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