Immersion microscope objective lens
US6519092B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Nov 13, 2001 |
| Grant date | Feb 11, 2003 |
| Priority date | — |
| Expiry date | Nov 13, 2021 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B21/02
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
An immersion microscope objective lens comprises a first lens group G1 having a positive refracting power, a second lens group G2 having a positive refracting power and a third lens group G3 having a negative refracting power in the order from the object side. The first lens group G1 has a first cemented lens consisting of a plano-convex lens with the flat surface facing the object side and a meniscus lens with the convex lens facing the image side cemented together, a positive lens with the surface having a greater refractive power facing the image side, and a second cemented lens consisting of a negative lens and a positive lens cemented together, in the order from the object side. The second lens group G2 has a cemented lens consisting of a negative lens and a positive lens cemented together. The refractive index n12 of the meniscus lens in the first lens group G1 with respect to the d-line satisfies the following condition:n12>1.9.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.