Illumination variable colorimetric method and colorimeter
US6661915B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Jul 25, 2000 |
| Grant date | Dec 9, 2003 |
| Priority date | — |
| Expiry date | Feb 25, 2022 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N21/255
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A method and apparatus allows mutual comparison of a mode of appearance of a color by the visual sense with a mode of appearance of the color from a calorimetric value from a calorimeters, and establishes a corresponding relationship between both evaluations. In the illumination variable calorimetric method and colorimeter, an illumination adjustment mechanism and an illumination measurement light receiver are disposed in a measurement optical path of an optical portion. After an illumination is adjusted to a predetermined illumination while a standard plate is placed on the surface of a sample table, standard adjustment is effected. Thereafter, measurement is started by placing a sample on the sample table, and the illumination of the sample table is varied by the light quantity adjustment mechanism so that changes in hue, saturation and lightness of a surface color of the sample and each color difference value with respect to the change of illumination of the same sample can be measured and displayed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.