Light collecting optical device forming a multiple focal distance lens
US6271975A · kind A · utility
13Cited by
7References
21Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Apr 8, 1999 |
| Grant date | Aug 7, 2001 |
| Priority date | — |
| Expiry date | Apr 8, 2019 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B15/02
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A multiple focal distance light collecting optical device, is characterised in that it consists of a monoblock structure formed of at least a first and a second transparent material (8, 10) formed into lenses (12, 14, 16,) which are applied against and attached to each other the refractive indices and radii of curvature of the faces of such lenses being determined to focus the light rays so as to create an image in accordance with at least two different focal distances (A, B).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.