Imaging lens and imaging apparatus
US9651760B2 · kind B2 · utility
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20Claims
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Assignee
Inventor
Key dates
| Filing date | Feb 2, 2016 |
| Grant date | May 16, 2017 |
| Priority date | — |
| Expiry date | Feb 2, 2036 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B15/28
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
An imaging lens consists essentially of, in order from the object side, a positive first lens group, a negative second lens group, a stop, and a positive third lens group. Focusing is effected by moving only the second lens group along the optical axis direction. Each of the first lens group and the third lens group includes at least three positive lenses and at least two negative lenses. The imaging lens satisfies the condition expression (1) below:0.53<−f2/f<0.9 (1),where f2 is a focal length of the second lens group, and f is a focal length of the entire system when the imaging lens is focused on an object at infinity.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.