Imaging optical system, and imaging apparatus incorporating the same
US8982484B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Jul 23, 2013 |
| Grant date | Mar 17, 2015 |
| Priority date | — |
| Expiry date | Jul 23, 2033 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03B3/00
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
An imaging optical system including, from the object side to the image side, a first lens group having positive refracting power, an aperture stop, and a second lens group having positive power, in which the first lens group consists of three lens subgroups, having positive, negative and positive refracting powers, respectively, from the object side to the image side, with satisfaction of the following:4<(LTL+fB)/fB<15 (1)0.3<D12/IH<4 (2)where fB is an on-axis distance, from an image side-surface in the second lens group to an image plane upon focusing at infinity, LTL is an on-axis distance from an object side-surface in the first lens group to the image side-surface in the second lens group, D12 is an on-axis length from an image side-surface in the first lens group to an object side-surface in the second lens group upon focusing at infinity, and IH is a maximum image height.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.