Objective lens for endoscope and endoscope
US12055702B2 · kind B2 · utility
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20Claims
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Assignee
Inventor
Key dates
| Filing date | Nov 3, 2021 |
| Grant date | Aug 6, 2024 |
| Priority date | — |
| Expiry date | Jan 24, 2043 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B13/18
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
The objective lens for an endoscope consists of, in order from an object side, a first lens group consisting of one negative lens, a second lens group consisting of two lenses cemented together, a stop, a third lens group consisting of two lenses that have refractive powers with different signs and are cemented together, and a fourth lens group consisting of two lenses that have refractive powers with different signs and are cemented together. The objective lens for an endoscope satisfies a predetermined conditional expression regarding an Abbe number, a length of a lens system, and the like.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.