Dual wavelength F-theta scan lens
US5969877A · kind A · utility
19Cited by
5References
3Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Nov 26, 1997 |
| Grant date | Oct 19, 1999 |
| Priority date | — |
| Expiry date | Nov 26, 2017 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B13/0005
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
An F-theta scan lens for a dual beam, dual wavelength raster output scanning system (ROS) has four lens elements with the third and fourth lenses forming a doublet having a negative refractive power. This four-element F-theta scan lens corrects for axial chromatic aberration and lateral chromatic aberration for both wavelengths and provides scan linearity.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.