Multi-beam scanning optical system, image forming apparatus, and color image forming apparatus
US7098937B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Mar 29, 2004 |
| Grant date | Aug 29, 2006 |
| Priority date | — |
| Expiry date | Mar 18, 2025 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB41J2/473
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
In a multi-beam scanning optical system, when at least three light fluxes emitted from a light source having at least three light-emitting points are deflected and reflected on a deflection unit and guided to a surface to be scanned by a scanning optical unit, at least three light fluxes are entered into a deflection surface of the deflection unit at irregular angles within a main-scanning section and entered into the surface to be scanned at an angle within a sub-scanning section, and provided that a variation in lengths of scanning lines which is caused when each of the at least three light fluxes is entered into the surface to be scanned at an angle within the sub-scanning section is represented as ΔY1, a variation in lengths of scanning lines which is caused when each of the at least three light fluxes is allowed to enter as a non-parallel light flux to the deflection surface within the main-scanning section is represented as ΔY2, and a variation in lengths of scanning lines which is caused from a difference of wavelength between at least two of the at least three light fluxes is represented as ΔY3, values of ΔY1, ΔY2, and ΔY3 are set so as to satisfy |ΔY1+ΔY2+ΔY31<|ΔY1|.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.