Color image readout lens and color image readout apparatus
US7656594B2 · kind B2 · utility
0Cited by
3References
20Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jun 5, 2008 |
| Grant date | Feb 2, 2010 |
| Priority date | — |
| Expiry date | Jun 14, 2028 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B27/4283
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A color image readout lens comprises, in order from an object side: a first group comprising a positive lens convex toward the object side and a biconcave negative lens; a stop; a second group comprising one diffractive optical element that has at least one flat surface and has a diffractive structure formed on the flat surface; and a third group comprising a biconvex positive lens and a negative lens concave toward the object side.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.