Light source device, lighting and driving method thereof and projector
US7508144B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jul 30, 2007 |
| Grant date | Mar 24, 2009 |
| Priority date | — |
| Expiry date | Jul 30, 2027 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02B20/00
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A light source device, including: a high pressure discharge lamp in which an electric discharge is generated between a pair of electrodes; a lighting device that supplies drive current having a predetermined frequency to the high pressure discharge lamp to light and drive the high pressure discharge lamp; and a control device that controllably drives the lighting device, the control device including: a power-change controller that controls drive power supplied from the lighting device to the high pressure discharge lamp to be changeable at least between a first power and a second power lower than the first power; and a frequency-change controller that controls a frequency of the drive current supplied from the lighting device to the high pressure discharge lamp to be changeable, in a second power drive mode in which the second power is supplied to the high pressure discharge lamp by the power-change controller, the frequency-change controller changing the frequency of the drive power to a frequency higher than a frequency in a first drive mode in which the first power is supplied to the high pressure discharge lamp by the power-change controller.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.