Lighting apparatus and color measuring apparatus using the same

Details Lighting apparatus and color measuring apparatus using the same Lighting apparatus and color measuring apparatus using the same

1989-04-04

1991-04-02

Evans, F. L.

Optics: measuring and testing

By shade or color

315151, 356407, 356419, G01J 346, H05B 3702

Patent

active

050043498

ABSTRACT:
A color measuring apparatus for measuring the color of a sample has a light source measuring section for detecting color temperature of light coming from a light source without passing through or being reflected by the sample. Relationship between a plurality of color temperatures and a plurality of emission time periods of the light source is stored in a memory. A microcomputer compares each of detected color temperatures with a predetermined value and determines a certain time period on the basis of both the relationship stored in the memory and a comparison result. A lighting circuit energizes the light source during the time period determined by the computer so that the light source keeps lighting the sample. A sample measuring section detects light coming from the sample and the microcomputer measures a color of the sample.

REFERENCES:
patent: 4377774 (1983-03-01), Hosomizu
patent: 4449821 (1984-05-01), Lee
patent: 4485336 (1984-01-01), Yoshiyama

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