Scanning optical system
US6956686B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | May 10, 2002 |
| Grant date | Oct 18, 2005 |
| Priority date | — |
| Expiry date | Feb 17, 2024 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B26/125
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
A scanning optical system includes a light source, an anamorphic optical element, a polygonal mirror, and an imaging optical system that converges the beam(s) on a surface to be scanned. The imaging optical system has a scanning lens, and a compensation lens provided on the surface side for compensating for curvature of field. All the surfaces of the scanning lens are rotationally symmetrical, and the compensation lens has an aspherical surface. A cross section of the aspherical surface in the auxiliary scanning direction is asymmetrical with respect to the optical axis thereof, and a SAG amount defining the aspherical surface is expressed by a two-dimensional polynomial.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.