Lamp house and projector device thereof
US6494581B2 · kind B2 · utility
16Cited by
7References
26Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Mar 8, 2001 |
| Grant date | Dec 17, 2002 |
| Priority date | — |
| Expiry date | Mar 8, 2021 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03B21/2026
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A lamp house prevents danger when a lamp bulb, acting as a light source in a housing, breaks. The lamp house includes, at inlet and outlet vents for cooling the lamp bulb, movable plates which are movable only toward the inside of the housing of the lamp house. Springs for closing the movable plates are provided and a sensor for detecting opening and closing states of one of the movable plates is disposed on the side of the inlet vent.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.