Light source intensity control device
US5406172A · kind A · utility
23Cited by
5References
14Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Dec 28, 1993 |
| Grant date | Apr 11, 1995 |
| Priority date | — |
| Expiry date | Dec 28, 2013 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01S5/06825
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A light source device having a controlled current source that maintains a constant intensity of light from the source during changes in light source temperature, particularly at warm-up. The light source is heated to speed up warm-up and to maintain constant temperature of the source during operation under varying ambient temperatures. Control of the current to the light source is determined by the temperature profile circuit with signals via a temperature signal conditioner from a temperature sensor proximate to the light source. Control of the heater is ultimately dictated by temperature sensor signals.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.