Color-corrected telecentric scan lens
US5087987A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Mar 28, 1991 |
| Grant date | Feb 11, 1992 |
| Priority date | — |
| Expiry date | Mar 28, 2011 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B13/22
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A diffraction limited, f/6.0, 71.0 mm focal length telecentric scan lens which is color-corrected for 780 nm, 830 nm and 890 nm wavelengths. The lens includes, in succession from a side of incident light: PA0 a first negative meniscus lens element, concave toward the incident light side; PA0 a second positive meniscus lens element, concave toward the incident light side; PA0 a first plano-convex lens element, convex away from the incident light side; PA0 a second plano-convex lens element, convex toward the incident light side; PA0 a first cemented doublet including bi-concave and plano-convex lens elements, the cemented surface convex toward the incident light side; and PA0 a second cemented doublet including plano-concave and plano-convex lens elements, the cemented surface convex toward the incident light side.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.