Image lens system
US8270096B2 · kind B2 · utility
Assignees
Inventors
Key dates
| Filing date | Dec 23, 2010 |
| Grant date | Sep 18, 2012 |
| Priority date | — |
| Expiry date | May 8, 2031 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B13/009
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
An image lens system includes a first lens group that includes a first and a second lens, a movable second lens group that includes a third and a fourth lens, and a third lens group that includes a fifth lens. The image lens system satisfies the formulas: 2.1≦Lw/(a*Y)<2.5; 1.9≦|Fp|/F1|≦2.2; and 0.6≦|Fp2/F2|≦0.7, where “Lw” represents the overall length of the image lens system in the wide angle state, “a” represents the ratio of the effective focal length of the image lens system in the telephoto state to that in the wide angle state, “Y” represents the maximum height of image that the image lens system generates, “Fp1” and “Fp2” represents the effective focal lengths of the second and the fourth lenses, “F1” and “F2” represents the effective focal lengths of the first and the second lens groups.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.