Endoscope lens, and an endoscope equipped with such a lens
US6618207B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Jun 18, 2001 |
| Grant date | Sep 9, 2003 |
| Priority date | — |
| Expiry date | Aug 22, 2021 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B13/22
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
The invention relates to an endoscope lens which shows only a low level of distortion even at large angles of sight and whose elements can be produced and assembled with little effort, consisting of a first lens group having negative total refractive power, of an aperture diaphragm, and of a second lens group having a positive total refractive power, whereby all lens surfaces are spherical and all lenses are made of homogeneous materials. The first lens group contains at least one positive lens which is primarily arranged in the beam direction, and at least one negative lens, whereby the negative lenses in the first lens group are biconcave or plano-concave lenses. The invention also relates to an endoscope equipped with a lens of this type.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.