Imaging optical system
US9664881B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Oct 9, 2015 |
| Grant date | May 30, 2017 |
| Priority date | — |
| Expiry date | Oct 9, 2035 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B27/0025
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
An imaging optical system includes a positive first lens element having a convex surface on the object side, a negative second lens element having a concave surface on the image side, a third lens element, a positive fourth lens element, a fifth lens element, and a negative sixth lens element provided with at least one aspherical surface that has inflection points other than at an optical axis thereof. The following conditions (1) and (2) are satisfied:0.86<f/f12<1.20 (1), and−0.71<(r11−r12)/(r11+r12)<−0.20 (2),wherein f designates the focal length of the imaging optical system, f12 designates the combined focal length of the first and second lens elements, and r11 and r12 designate the radius of curvatures of surfaces on the object side and image side of the first lens element, respectively.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.