Safety switch which renders HID lamp inoperative on accidental breakage of outer envelope
US4013920A · kind A · utility
10Cited by
6References
5Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jan 22, 1976 |
| Grant date | Mar 22, 1977 |
| Priority date | — |
| Expiry date | Jan 22, 1996 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01J61/34
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
HID lamp has resilient safety switch positioned proximate the inner surface of the dome portion of the protective outer envelope in contact with an extremity of a resilient leaf-spring support portion of the arc tube frame, to maintain the switch in a closed position. When the envelope is shattered, the normally closed switch will open to break the electrical path to the arc tube, thereby rendering the lamp inoperative.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.