Zoom lens device
US6930839B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 28, 2003 |
| Grant date | Aug 16, 2005 |
| Priority date | — |
| Expiry date | Aug 28, 2023 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B15/144515
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A zoom lens device has a zoom lens system having a plurality of lens units; and an image sensor converting an optical image formed by the zoom lens system, into electric image data. The zoom lens system has a first lens unit disposed on the most object side and consisting of a single negative lens element, a second lens unit having a positive optical power; and a diaphragm disposed on the object or the image side of the second lens unit, or in the second lens unit. Zooming is performed by varying the distances between the lens units. Focus adjustment by varying the object distance is performed by moving along the optical axis a positive lens unit or a single lens element disposed in a position on the image side of the diaphragm and not included in the most image side lens unit.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.