Zoom lens and magnifier utilizing the same
US5703727A · kind A · utility
2Cited by
19References
7Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jul 22, 1994 |
| Grant date | Dec 30, 1997 |
| Priority date | — |
| Expiry date | Jul 22, 2014 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B7/10
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A zoom lens is described which is quite simple and yet provides a wide (5:1) zoom range. The lens consists of a front focusing negative lens which provides a stationary virtual image for two rear zooming lens groups. These two zooming groups are positive and reimage the object at a camera pickup device. Such zooming groups are of substantially equal focal length and bear equally in the magnification change. The invention includes a magnifier which utilizes the zoom lens and has the mechanical aspects necessary to provide the needed lens motions.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.