Tube lens unit with chromatically compensating effect
US7289271B2 · kind B2 · utility
2Cited by
4References
6Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Aug 28, 2006 |
| Grant date | Oct 30, 2007 |
| Priority date | — |
| Expiry date | Aug 28, 2026 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B21/02
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
The invention relates to a tube lens unit that obtains a chromatically compensating effect when used with objectives having an infinite image distance and chromatic residual errors. The inventive tube lens unit fulfils the following conditions:CHL=CHLo−AT2mTφT=0 Equation (1)CHV=CHVo−1000λmTφTd1=0 Equation (2)
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.