Immersion cartesian ovoid lens
US4869580A · kind A · utility
7Cited by
3References
5Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Nov 21, 1986 |
| Grant date | Sep 26, 1989 |
| Priority date | — |
| Expiry date | Nov 21, 2006 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH10F77/407
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A substantially solid transparent body focuses light from an LED wholly immersed therein to a point external to the body. The body is composed of a substantially non-heat-conducting plastic material and has a surface with the curvature of a Cartesian Ovoid substantially in accordance with the formula L.sub.o .times.N.sub.o .times.L.sub.i .times.N.sub.i =C, where PA0 L.sub.o is the distance from a point on the surface to the external point; PA0 L.sub.i is the distance from the LED to the point on the surface; PA0 N.sub.o is the index of refraction in air; and PA0 N.sub.i is the index of refraction of the plastic material.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.