Optical system, optical apparatus and method for manufacturing the optical system
US9671586B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Feb 20, 2013 |
| Grant date | Jun 6, 2017 |
| Priority date | — |
| Expiry date | Feb 20, 2033 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T29/49826
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
Provided is an optical system having, in order from an object, a positive first lens group (G1), an aperture stop (S) and a second lens group (G2), wherein the first lens group (G1) includes, in order from the object, a negative lens component (L1), a positive lens component (L2) and a first lens component (L3, L4), the image side surface of which is a concave surface facing the aperture stop (S), the second lens group (G2) includes, in order from the object, a second lens component (L5, L6), the object side surface of which is a concave surface facing the aperture stop (S), and a positive lens component (L8) disposed closest to the image, the first lens component (L1) and the second lens component (L2) face each other sandwiching the aperture stop (S), and the following conditional expressions (1) and (2) are satisfied: 1.5<fG1/f<2.6 . . . (1) and 2.1<TL/f<3.1 . . . (2), where fG1 denotes a focal length of the first lens group (G1), f denotes a focal length of the optical system (WL), and TL denotes a distance on the optical axis, from the optical surface closest to the object to the optical surface closest to the Image in the optical system (WL).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.