Aspherical lens with grating
US7082000B2 · kind B2 · utility
28Cited by
5References
18Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jun 7, 2004 |
| Grant date | Jul 25, 2006 |
| Priority date | — |
| Expiry date | Jun 7, 2024 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B5/1814
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
An aspherical lens (10, 10′) has an aspherical surface (101, 101′) and an opposite flat surface (102, 102′). A multiple-step grating is defined in the flat surface by a photolithographic method. The aspherical lens has a reduced chromatic aberration effect, and can thus provide a clear image. Furthermore, an effect of the aspherical lens having the grating is equivalent to that of a conventional aspherical lens unit. Thus, when the aspherical lens is used in an optical system, it can reduce a bulk and a weight of the optical system.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.