Switching device for projection lamp
US4150887A · kind A · utility
Assignees
Inventor
Key dates
| Filing date | Nov 14, 1977 |
| Grant date | Apr 24, 1979 |
| Priority date | — |
| Expiry date | Nov 14, 1997 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03B21/2026
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A switching device for a projection lamp of a projector wherein an electrical control device, which is separated from the projector and which supplies the projector lamp with electrical energy, is controllable from the projector by a control device via at least one control connection disposed on the projector. PAC FIELD OF THE INVENTION The invention relates to a switching device for a projection lamp, especially a gaseous discharge lamp, which needs a relatively large electrical control unit that normally is separated from the projector. PAC BACKGROUND OF THE INVENTION Such a device is known from U.S. Pat. No. 3,039,022. With this device it was disadvantageous that all control functions were carried out by means of the electrical control unit, so that the transmission of control commands from the electrical control unit to the mechanical parts of the projector had to be effected by means of relatively expensive magnets. PAC SUMMARY OF THE INVENTION It is an object of the present invention to create a simplified and less expensive control means, which in accordance with another object of the invention is aided in its accomplishment in the manner that the control device is arranged …
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.