Optical scanner and electrophotographic image forming apparatus
US11841498B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Nov 15, 2021 |
| Grant date | Dec 12, 2023 |
| Priority date | — |
| Expiry date | Feb 15, 2042 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03G15/0435
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
Optical scanner and electrophotographic image forming apparatus are provided. The optical scanner includes a light source, configured to emit a light beam; an optical deflector, configured to deflect the light beam emitted from the light source; a first optical unit, arranged there-between and including a refraction unit and a diffraction unit; and a second optical unit, arranged in a light exit direction of the optical deflector and configured to make the light beam deflected by the optical deflector form an image on a scanning target surface. A range of a ratio of a refractive power Φr to a diffractive power Φd of the first optical unit in a main scanning direction is 0.3<Φr/Φd<0.5; and a range of a ratio of a refractive power Φs to a diffractive power Φn of the first optical unit in a sub scanning direction is 0.7<Φs/Φn<1.0.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.