High pressure discharge lamp lighting apparatus and projector
US8342695B2 · kind B2 · utility
4Cited by
3References
7Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Sep 8, 2010 |
| Grant date | Jan 1, 2013 |
| Priority date | — |
| Expiry date | Jun 24, 2031 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02B20/00
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A discharge lamp lighting apparatus comprises a discharge lamp and a power supply the discharge lamp can be switched between a steady power lighting mode, which drives the discharge lamp by an alternating current in which first and second polarities are repeated by turns, and a low power lighting mode, which drives the discharge lamp at 50% or less of the alternating current of the steady power lighting mode, and the alternating current comprises a first time unit, which has a time width t1, and second time unit, which has a time width t2, that are repeated by turns to drive the discharge lamp.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.