Eyepiece lens and observation apparatus having the same
US9551864B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Sep 4, 2014 |
| Grant date | Jan 24, 2017 |
| Priority date | — |
| Expiry date | Nov 3, 2034 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B23/14
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
There is provided an eyepiece lens which has a long length from an image display surface to a first lens, a high observation magnification, and a large apparent field of view. An eyepiece lens used to observe an image displayed on the image display surface includes a first lens with a positive refractive power, a second lens with a negative refractive power, and a third lens with a positive refractive power sequentially from the image display surface side to the observation side. The lens surface of the first lens on the image display surface side has a convex shape on the image display surface side. The lens surface of the second lens on the observation side has a concave shape on the observation side. The focal length of the eyepiece lens, the focal length of the lens surface, and the focal length of the lens surface are set appropriately.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.