Imaging lens and image pickup apparatus
US9766431B2 · kind B2 · utility
0Cited by
4References
18Claims
0Family size
Assignee
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Key dates
| Filing date | Aug 8, 2013 |
| Grant date | Sep 19, 2017 |
| Priority date | — |
| Expiry date | Jan 11, 2034 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B13/18
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
An imaging lens includes: a movable lens group configured to travel to allow the imaging lens to come into focus; and a rearmost lens group arranged at a most-image-sided fixed position, and having negative refractive power. Following conditional expression is satisfied,−2<ft/fr<−0.45 (1)where ft is a total focal length of the imaging lens in a condition that the imaging lens is in focus on an object at infinite, and fr is a focal length of the rearmost lens group.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.