Image transmission system from three rod lenses for rigid endoscopes
US7586679B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Jan 26, 2004 |
| Grant date | Sep 8, 2009 |
| Priority date | — |
| Expiry date | May 12, 2026 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B23/2446
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
The invention relates to an image transmission system for rigid endoscopes, having a central rod lens and two outer rod lenses, which are symmetrical in respect to one another in relation to a vertical central plane of the image transmission system relative to the optical axis, wherein all lens elements consist of optically homogenous material, all optically active surface are spherical and two lens elements are stuck to on another facing each other or facing away from one another on the opposite sided of the central and outer lenses in the main lens elements of the rod lenses so that the resulting composite lens is biconvex. According to the invention, the rod lenses are arranged apex to apex next to one another and the central rod lens is substantially as long as or longer than the outer rod lenses. The solution according to the invention provides an image that is as light as possible at a given transmission length, wherein the structure of the rod lens system is simple and imaging errors can be corrected as in prior art. The number of components and production complexity are low.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.