Variable magnification optical system
US7382548B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Oct 12, 2005 |
| Grant date | Jun 3, 2008 |
| Priority date | — |
| Expiry date | Oct 12, 2025 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B15/16
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A variable magnification optical system of the present invention for forming an optical image of an object on a light-receiving surface of an image sensor with variable magnification includes: from the object side, at least a first lens unit having a positive optical power, a second lens unit having a negative optical power, a third lens unit having a positive optical power, and a fourth lens unit having a positive optical power. The variable magnification is performed by movement of at least the first lens unit and the third lens unit. A bending optical element for bending an optical axis is provided between the second lens unit and the third lens unit. Moreover, prescribed conditional formulae are fulfilled.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.