Endoscope objective lens
US7027231B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Feb 10, 2004 |
| Grant date | Apr 11, 2006 |
| Priority date | — |
| Expiry date | Apr 28, 2024 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B23/243
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
An endoscope objective lens with a three-group, three lens element construction, is formed of, in order from the object side, a first lens element having either a negative meniscus shape or a plano-concave shape with its concave surface on the image side, a stop, a positive second lens element having a plano-convex shape with its convex surface on the image side, and a positive third lens element having a plano-convex shape with its convex surface on the object side. The stop is positioned on or in contact with the object-side surface of the second lens element so that the endoscope objective lens is substantially telecentric. Specified conditions are satisfied in order to reduce aberrations and make the manufacture of the endoscope objective lens easier and less expensive.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.