Gradient index single lens
US4770506A · kind A · utility
9Cited by
3References
16Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jul 6, 1987 |
| Grant date | Sep 13, 1988 |
| Priority date | — |
| Expiry date | Jul 6, 2007 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B3/0087
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
This specification discloses a single lens having an index gradient in a direction perpendicular to the optic axis thereof, and the surface of the single lens on the light beam incidence side when the single lens is used at a reduced magnification is formed into a surface concave relative to the object side, whereby the working distance is sufficiently long and aberration are well corrected.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.