Objective lens system for endoscopes
US5436767A · kind A · utility
112Cited by
6References
7Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | May 2, 1994 |
| Grant date | Jul 25, 1995 |
| Priority date | — |
| Expiry date | May 2, 2014 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B23/243
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
An objective lens system for endoscopes comprising, in order from the object side, a first lens component having negative refractive power, a second lens component having positive refractive power and a third lens component having positive refractive power; wherein astigmatism is corrected favorably by using an aspherical surface in the third lens component or an aperture stop is arranged between the second lens component and an image surface of the objective lens system, and aberrations including chromatic aberration are corrected favorably.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.