Dual format pre-objective scanner
US5867298A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 16, 1996 |
| Grant date | Feb 2, 1999 |
| Priority date | — |
| Expiry date | Dec 16, 2016 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N1/1135
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A dual format pre-objective scanner (10), for use in a laser printer, having an incident beam (22) from input optics (12) incident on a polygon tower (14) comprised of a first polygon (20) having a first diameter and first number of facets and a second polygon (30) having a second diameter and second number of facets, rotating about an axis (42) common to both first and second polygon. The polygon tower (14) is moved in a vertical direction so that the incident light is directed in a plane approximately perpendicular to the axis rotation of the first and second polygon, at either the first polygon (20) or the second polygon (30). The polygon tower (14) is also moved in a lateral direction approximately perpendicular to the axis (42) of rotation of the polygon tower (14). To change size and formats, the polygon tower (14) is moved simultaneously both vertically and laterally so that incident beams on the facets of the first polygon (20) become incident on the facets of the second polygon (30) at approximately the same distance from a scan lens (16).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.