Image reader
US6009292A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 22, 1997 |
| Grant date | Dec 28, 1999 |
| Priority date | — |
| Expiry date | Oct 22, 2017 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03G15/041
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A drive control mechanism for an image reader having a controller, to control a drive current impressed to a connected stepping motor such that the impression of the drive current is carried out in a prescribed number of steps, and a changer, to change a largest value of a drive current in response to a scanning speed of a reading device of the image reader. Consequently, smooth rotation with little torque ripple may be obtained through microstep driving, and by changing a largest drive current, control of a drive torque becomes easier, thus making it possible to maintain an even balance between load torque and drive vibration when a high-torque motor is used to eliminate slider vibration.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.