Illumination lens, illumination optical system, and endoscope
US11906725B2 · kind B2 · utility
0Cited by
8References
9Claims
0Family size
Assignee
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Key dates
| Filing date | Feb 24, 2020 |
| Grant date | Feb 20, 2024 |
| Priority date | — |
| Expiry date | Aug 4, 2042 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B2003/0093
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
An illumination lens consists of a first lens and a second lens that are arranged in this order from a light source side toward an irradiation target side. The surface of the first lens close to the light source side and the surface of the first lens close to the irradiation target side are spherical convex surfaces, and the surface of the second lens close to the light source side is a spherical convex surface. Conditional expression determined in advance about the radii of curvature of the surfaces of the first and second lenses is satisfied.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.