Zoom lens system
US6185049A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 12, 1999 |
| Grant date | Feb 6, 2001 |
| Priority date | — |
| Expiry date | Apr 12, 2019 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B15/143103
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A zoom lens system has, from the object side, a first lens unit having a positive optical power, a second lens unit having a positive optical power and provided at the image side of the first lens unit with a first variable air space between the first and second lens units, and a third lens unit having a negative optical power and provided at the image side of the second lens unit with a second variable air space between the second and third lens units, wherein a zooming operation is performed by varying the first and second air spaces, and wherein the zooming fulfills the predetermined condition with respect to a lateral magnification of the third lens unit in a shortest focal length condition.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.