Tandem type printer scanning optical system having diffraction lens structure
US6906824B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 31, 2000 |
| Grant date | Jun 14, 2005 |
| Priority date | — |
| Expiry date | Oct 10, 2022 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06K15/129
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A tandem type printer is provided with a plurality of scanning optical systems, a plurality of fθ lenses and photoconductive drums, which correspond to the scanning optical systems, respectively. Each scanning optical system includes a laser source and a deflector that deflects the laser beam emitted by the laser source to scan, in a main scanning direction, within a predetermined angular range. The deflected laser beam is converged by the fθ lens on the corresponding photoconductive drum and form an image. Images formed on the plurality of photoconductive drums are developed and transferred on a sheet in an overlaid fashion. Each fθ lens includes a glass lens that is burdened with substantially all the power, in the main scanning direction, of the fθ lens, and a plastic lens that is burdened with compensation for aberrations of the fθ lens. Further, a diffraction lens structure is formed to compensate for a lateral chromatic aberration of the fθ lens in the main scanning direction. Each fθ lens satisfies conditions:0.0<fa/fd<0.20: and 0.75<fa/fg<1.20,
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.