Scanning optical system, optical scanning device, and image forming device
US8223419B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jan 21, 2009 |
| Grant date | Jul 17, 2012 |
| Priority date | — |
| Expiry date | Jul 11, 2029 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N1/1135
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A scanning optical system is provided with a light source device (1), a deflection optical system (5) that deflects the light flux from the light source device (1) to carry our a scan in a main-scanning direction (y), and a scanning and image-forming optical system (8) that forms the light flux deflected by the deflection optical system (5) into an image on a scanning surface (H). The scanning and image-forming optical system (8) includes at least a first lens (6). The scanning optical system satisfies a predetermined condition relating to a numerical aperture of a light flux entering the deflection optical system (8) in a sub-scanning direction (z), and a distance between the deflection optical system (5) and the first lens (6). The first lens (6) is a plastic lens made of a predetermined resin as a base material.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.