Zoom optical system, optical apparatus equipped with zoom optical system and method for manufacturing zoom optical system
US8238040B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Nov 25, 2010 |
| Grant date | Aug 7, 2012 |
| Priority date | — |
| Expiry date | Nov 25, 2030 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T29/49826
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A zoom optical system including, in order from an object side: a first group having positive power; a second group having negative power; a third group having positive power; and a fourth group having positive power, at least a portion of lenses within said third group composing a movable group which moves in a direction having a component perpendicular to an optical axis, a distance between said first group and said second group, a distance between said second group and said third group and a distance between said third group and said fourth group being variable upon zooming from a wide-angle end state to a telescopic end state, thereby providing a zoom optical system capable of correcting a camera shake by the movable group with realizing high optical performance, a high zoom ratio, and a small f-number, an optical apparatus equipped therewith, and a method for manufacturing thereof.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.