Imaging optical system
US10831001B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Oct 18, 2018 |
| Grant date | Nov 10, 2020 |
| Priority date | — |
| Expiry date | Feb 2, 2039 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B23/243
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
The imaging optical system is provided with a first lens having a negative refractive power, a second lens having a positive refractive power, an aperture stop, and a third lens having a positive refractive power, disposed from the object side to the image side. With |d| being the distance between the image-side principal point of the first lens and the object-side principal point of the second lens, d=−|d| being the signed distance between the image-side principal point of the first lens and the object-side principal point of the second lens when the image-side principal point of the first lens is further towards the image side than the object-side principal point of the second lens, and f12 being the composite focal length of the first lens and the second lens, the relationships d<0 and 0.005<d/f12<16 are established.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.