Vibration proof zoom lens and photographing apparatus having the same
US9140905B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Dec 21, 2011 |
| Grant date | Sep 22, 2015 |
| Priority date | — |
| Expiry date | Mar 16, 2034 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B27/646
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
In a vibration proof zoom lens 100, a third lens group G3 has a positive lens 7, a positive cemented lens 8, a negative cemented lens 9, which are arranged in order from an object side. In variable-magnifying from a wide angle limit to a telephoto limit, a clearance between a first lens group G1 and a second lens group G2 is increased and at the same time, a clearance between the second lens group G2 and a third lens groupG3 is decreased, a focusing from an infinity side to a close side is performed by moving the positive lens 7 toward an image, and a vibration proof is performed by moving the cemented lens 9 in a direction perpendicular to an optical axis to change an image position.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.