Digital camera objective with diffractive optical surface
US6040943A · kind A · utility
9Cited by
12References
40Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Mar 23, 1998 |
| Grant date | Mar 21, 2000 |
| Priority date | — |
| Expiry date | Mar 23, 2018 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B27/0037
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A lens system having a reduced number of injection-molded singlet lens elements with at least one diffractive surface to control axial and lateral chromatic aberrations is disclosed. In one embodiment, the diffractive surface is placed on the first surface of the third lens, which is closest to the image plane. An opaque spacer provides suppression of stray light from reaching the image plane.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.