Compound catoptric cartesian ovoid lens
US4753520A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Nov 17, 1986 |
| Grant date | Jun 28, 1988 |
| Priority date | — |
| Expiry date | Nov 17, 2006 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B3/02
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A substantially solid transparent molded plastic body focuses light from an internal point to a point external to the body. The body has a center section with a surface having the curvature of a Cartesian Ovoid of revolution and a peripheral section. The peripheral section includes an inner refracting surface in the shape of a diverging truncated cone whose apex substantially coincides with the internal point and an outer reflecting surface in the shape of a polynomial curve of revolution. The slope of the outer surface causes it to reflect light rays between the refractory inner surface and the internal point. A light source such as an LED, or a photo-detector, may be immersed in the body at the internal point.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.