Device for regulating a xenon lamp with optical and temperature compensation
US4025440A · kind A · utility
Inventor
Key dates
| Filing date | May 4, 1976 |
| Grant date | May 24, 1977 |
| Priority date | — |
| Expiry date | May 4, 1996 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH05B41/392
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A temperature compensating device for use in regulating the voltage to a lamp in a lightfastness tester. The device includes a plurality of aluminum-coated glass rods adjacent the lamp for transmitting the light produced by the lamp to a light-receiving element, such as a photoelectric cell. A heat-sensitive resistance is electrically connected to the light-receiving element and compensates for changes in temperature of the light-receiving element. An electric circuit is combined with the light-receiving element and the resistance to receive the temperature adjusted voltage from the light-receiving element and the resistance and to compare that voltage with a reference voltage. In turn, the voltage to the xenon lamp is adjusted based on the difference between the two compared voltages.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.