Shearing radiation beam for imaging printing media
US7885012B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Jul 23, 2008 |
| Grant date | Feb 8, 2011 |
| Priority date | — |
| Expiry date | Mar 31, 2029 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B27/0966
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
An illuminator (10) for producing a radiation spot (120) on a workpiece (110) comprises a laser light source (20) and a beam-shearing optical system (30). Fine structure (160) generated by an integrator (80) of laser light source (20) in integrated beams (90) as a result of path length differences among coherent light beams (70) from emitters (60) of lasers (40) is sheared by the inclusion of beam-shearing optical system (30) into illuminator (10). Beam-shearing optical system (30) allows illuminator (10) to produce a radiation spot (120) in which the fine structure (160) is spread so that scanning of radiation spot (120) does not produce the striations (140) in scanned patch (170) that are obtained with prior art illuminators.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.