Colorimeter employing primary filter mirrors
US4150898A · kind A · utility
Inventor
Key dates
| Filing date | Aug 31, 1977 |
| Grant date | Apr 24, 1979 |
| Priority date | — |
| Expiry date | Aug 31, 1997 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01J3/501
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
In a colorimeter including a light source, a first quantity of light is directed toward a color sample and from the color sample toward a single photoelectric receiving and measuring device which is capable of measuring amounts of primaries or tristimulus values in quantities of light. A first carriage has mounted thereon an X primary filter, a Y primary filter and a Z primary filter, and such first carriage is reciprocable so that a selected primary filter may be positioned in front of the single photoelectric device. Adjacent the light source is mounted a second carriage which supports thereon an X primary filter mirror, a Y primary filter mirror and a Z primary filter mirror. The second carriage is reciprocable to position adjacent the light source a selected primary filter mirror corresponding to that primary filter positioned adjacent the photoelectric device. A second quantity of light from the light source is directed toward the selected primary filter mirror which reflects and changes the spectral characteristics of the second quantity of light. This second quantity of light is then directed toward the color sample and through the selected primary filter to the photoelectri…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.