Zoom lens
US5243466A · kind A · utility
2Cited by
2References
4Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Dec 24, 1991 |
| Grant date | Sep 7, 1993 |
| Priority date | — |
| Expiry date | Dec 24, 2011 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B15/1421
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A lens system comprising a positive power lens assembly and a negative power lens assembly, in which the positive power lens assembly includes a cemented doublet and a two-surface aspheric lens. The present invention discloses a zoom lens with a 2.57.times.zoom ratio.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.