Lamp driver scheme
US4849777A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Feb 22, 1988 |
| Grant date | Jul 18, 1989 |
| Priority date | — |
| Expiry date | Feb 22, 2008 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG05B2219/43147
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A system for projecting a spot of radiant energy includes a lamp for projecting a light spot onto a surface and includes means for providing a selection of differently sized spots. Drive means moves the light spot relative to the surface and is capable of moving the light spot at a maximum given velocity which is the same for all of the differently sized spots. Velocity output means produces a velocity signal representing the velocity of the spot and a normalized velocity signal is produced by dividing the volocity signal by the maximum given velocity. Each differently sized spot is assigned a different lamp command voltage signal and a selected one of the lamp command voltage signals is multiplied by the normalized velocity signal to produce a resultant lamp command voltage signal which energizes the lamp.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.