Control for projector lamp heat dissipation
US6472828B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 23, 2000 |
| Grant date | Oct 29, 2002 |
| Priority date | — |
| Expiry date | Jun 23, 2020 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH05B41/382
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A portable image projector is provided with a fan having a control system for cooling a metal-halide arc lamp. The arc lamp cooling system of the present invention includes a fan having a fan control to operate the fan at an initially reduced level during lamp start-up to allow the temperature of the arc lamp to increase to its full operating temperature. The fan control includes a microcontroller to operate the fan at a reduced voltage over a period of time after which the voltage is increased to operate the fan at full capacity. Power to the fan may be increased in incremental time steps or linearly over a period of time as determined by the microcontroller.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.