Photographing lens, optical apparatus and method for manufacturing the photographing lens
US9405094B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Nov 29, 2014 |
| Grant date | Aug 2, 2016 |
| Priority date | — |
| Expiry date | Nov 29, 2034 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03B19/12
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
Provided is a photographing lens (ML) including a first lens group (G1) having positive refractive power, a second lens group (G2) having negative refractive power, and a third lens group (G3) having positive refractive power, the photographing lens being configured such that the second lens group (G2) moves along the optical axis upon focusing from an object at infinity to an object at a finite distance. The first lens group (G1) includes a front lens group (G1a) and a rear lens group (G1b) having a longest air interval from the front lens group (G1a) in the first lens group (G1), and the second lens group (G2) includes a negative lens (L21) and a cemented lens in which a positive lens (22) and a negative lens (23) are cemented in order from the object.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.