Safety switch which renders HID lamp inoperative on _accidental breakage of outer envelope
US4229678A · kind A · utility
6Cited by
5References
3Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Dec 7, 1976 |
| Grant date | Oct 21, 1980 |
| Priority date | — |
| Expiry date | Dec 7, 1996 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01J61/34
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
An HID lamp has a very positive acting and simple resilient safety switch positioned proximate the inner surface of the bulb portion of the protective outer envelope and in contact therewith which maintains the switch in a closed position. When the envelope is shattered, the 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.