Zoom lens
US6980369B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 5, 2004 |
| Grant date | Dec 27, 2005 |
| Priority date | — |
| Expiry date | Jun 14, 2024 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B15/143507
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
To obtain a small and thin zoom lens unit, the present invention includes a first lens group having a negative refractive power as a whole, a second lens group having a positive refractive power as a whole, and a third lens group having a positive refractive power as a whole, arranged from an object side to an image side. The zoom lens zooms from a short-focal end to a long-focal end and corrects image surface changes required in accordance with the zooming by means of moving the second lens group and the third lens group, wherein the first lens group includes a first lens having a negative refractive power and a prism having a negative refractive power and changing an incident light path, arranged from the object side to the image side, the second lens group including a single second lens, said third lens group including a single third lens.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.