Objective lens system for endoscopes
US5208702A · kind A · utility
47Cited by
5References
13Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Apr 10, 1991 |
| Grant date | May 4, 1993 |
| Priority date | — |
| Expiry date | Apr 10, 2011 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B23/243
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
An objective lens system for endoscopes comprising, in the order from the object side, a first lens component having a negative refractive power, a second lens component having a positive refractive power, an aperture stop arranged right after the second lens component, and a rear lens unit comprising a third lens component designed as a cemented doublet consisting of a lens element having a positive refractive power and a lens element having a negative refractive power. Said objective lens system for endoscopes has a wide field angle, a compact design, a small number of lens elements and favorably corrected aberrations.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.