Internal focus lens
US9116286B2 · kind B2 · utility
Assignees
Inventors
Key dates
| Filing date | May 8, 2012 |
| Grant date | Aug 25, 2015 |
| Priority date | — |
| Expiry date | Nov 10, 2033 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B27/646
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
An internal focus lens includes sequentially from an object side, a first lens group having a positive refractive power; a second lens group having a negative refractive power; and a third lens group having a positive refractive power. The first lens group includes an anti-vibration lens formed by a negative lens that is moved in an orthogonal direction with respect to an optical axis to correct image blur consequent to optical system vibration, and further includes an aperture stop disposed farther on an image side of the first lens group than the anti-vibration lens. The second lens group is moved along the optical axis to perform focusing.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.