Light source having a multiply conic lens
US5013144A · kind A · utility
70Cited by
2References
26Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jul 23, 1990 |
| Grant date | May 7, 1991 |
| Priority date | — |
| Expiry date | Jul 23, 2010 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S362/80
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A lens for a light emitting diode (LED) lamp is formed as two ellipses rather than as one. The ellipses are axially symmetric and are translated away from the optical axis with each ellipse having a focus located on the LED chip away from the central bond pad so that the bond pad shadow does not decrease on-axis light intensity. In alternative embodiments, the depression located at the intersection of the two ellipses is flattened and the axes of the two ellipses are translated away from the optical axis and are also tilted.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.