Variable spot size illuminator with constant convergence angle
US4628416A · kind A · utility
59Cited by
20References
12Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | May 3, 1985 |
| Grant date | Dec 9, 1986 |
| Priority date | — |
| Expiry date | May 3, 2005 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB23K26/073
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A variable spot size illuminator for projecting a variable size spot of light into an illumination plane comprises a source of light, fiberoptic image transmission means having an entrance surface and an exit surface, means for projecting a cone of said light onto said entrance surface, objective lens means for focusing light emerging from said exit surface into said illumination plane, and means for varying the distance between said entrance surface and the vertex of said cone of light. The variable spot size illuminator is useful for projecting a spot of variable size with constant beam convergence in a laser photocoagulator.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.