Zoom lens with diffractive optical elements
US5978153A · kind A · utility
11Cited by
4References
16Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Oct 26, 1998 |
| Grant date | Nov 2, 1999 |
| Priority date | — |
| Expiry date | Oct 26, 2018 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B27/4277
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A zoom lens includes, in order from an object side, a first lens unit of positive refractive power, a second lens unit of negative refractive power, and a subsequent lens unit of positive refractive power as a whole, wherein during zooming from a wide-angle end to a telephoto end, at least the first lens unit is moved along an optical axis such that a separation between the first lens unit and the second lens unit increases, and wherein at least one diffractive optical element is provided in the first lens unit.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.