Lighting apparatus and color measuring apparatus using the same
US5004349A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 4, 1989 |
| Grant date | Apr 2, 1991 |
| Priority date | — |
| Expiry date | Apr 4, 2009 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N21/255
- WIPO fieldMeasurement
- WIPO sectorInstruments
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.