Tristimulus colorimeter for use in the fabrication of artificial

Details Tristimulus colorimeter for use in the fabrication of artificial Tristimulus colorimeter for use in the fabrication of artificial

1974-08-22

1976-10-19

Corbin, John K.

Optics: measuring and testing

Refraction testing

Prism engaging specimen

250226, 250227, 324 99D, 340347NT, 350 96B, 356188, G01J 350

Patent

active

039867773

ABSTRACT:
A tristimulus colorimeter including a modified dual slope integrator digital voltmeter measures the red, blue and green light reflected from a sample and displays the same in digital form as optical density units. The colorimeter includes a light conducting probe with a diffusing member and a movable collar for blocking ambient light, and a rotating color filter wheel is synchronized with the voltmeter for effecting a continuous update of the data displayed thereby. Moreover, a color averaging method provides for prediction of the ultimate color of a mixture of two differently colored porcelains or the like especially used in the construction of artificial teeth or the like.

REFERENCES:
patent: 3029682 (1962-04-01), Wood
patent: 3383979 (1968-05-01), Gibson
patent: 3531208 (1970-09-01), Ward
patent: 3617885 (1971-11-01), Wheable
patent: 3711723 (1973-01-01), McMurtry
patent: 3740155 (1973-06-01), Keller et al.
patent: 3761184 (1973-09-01), McLaughlin
patent: 3802783 (1974-04-01), Simmonds et al.
patent: 3806256 (1974-04-01), Ishak
patent: 3860818 (1975-01-01), Stadler
patent: 3930252 (1975-12-01), Storar
Ishikawa et al., Bull. Tokyo Dental Coll., vol. 10, No. 4, Nov. 1969, pp. 191-197.
Ishak, Optica Acta, vol. 17, No. 10, 1970, pp. 725-732.

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