Color image forming apparatus with scanner motor synchronization
US6094208A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 25, 1998 |
| Grant date | Jul 25, 2000 |
| Priority date | — |
| Expiry date | Aug 25, 2018 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N2201/04794
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
In this digital color copier, laser beam scanner units of the same configuration are arranged in parallel with each other, and all are controlled in a unified manner by a laser control unit provided outside the units. In order to synchronously rotate the polygon mirrors in a precise manner, the speeds of rotations of their motors, fed back from tacho-generators are compared to the reference frequency generated from an oscillator so as to allow a motor control circuit to control the driving motors of the polygon mirrors. Further, the BD signals from beam detectors (BD) are fed back to the laser control unit so that all the BD signals from the laser scanner units for black and the three colors can become synchronized with each other, thus enabling control of the polygon mirrors.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.