Objective lens for an endoscope and endoscope
US9468358B2 · kind B2 · utility
3Cited by
2References
14Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Sep 18, 2014 |
| Grant date | Oct 18, 2016 |
| Priority date | — |
| Expiry date | Oct 9, 2034 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B13/04
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
The objective lens for an endoscope substantially consists of a first lens group having a negative refractive power, a stop, and a second lens group having a positive refractive power in this order from the object side. The first lens group consists of a single negative lens. The second lens group consists of two or fewer lenses. When the focal length of the first lens group is f1 and the focal length of the entire system is f, conditional expression (1): −0.9<f1/f<0 is satisfied.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.