Gradient index lens
US4674843A · kind A · utility
10Cited by
3References
5Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Feb 19, 1986 |
| Grant date | Jun 23, 1987 |
| Priority date | — |
| Expiry date | Feb 19, 2006 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B3/0087
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A gradient index lens includes first and second flat end faces. A refractive index N(.gamma.) at a position deviated by a distance .gamma. from an optical axis of the lens is given as EQU N(.gamma.)=N.sub.0 +N.sub.1 .gamma..sup.2 +N.sub.2 .gamma..sup.4 + . . . PA1 for N.sub.1 <0 where N.sub.0, N.sub.1, N.sub.2, . . . are constants, and the following conditions are satisfied: ##EQU1## where f is a focal length of the lens, a is an effective lens diameter, Sk' is a work distance, and .lambda. is a wavelength in units of microns.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.