Method of and apparatus for preventing scanning line deviation in a process scanner of a separated drum type
US4916367A · kind A · utility
6Cited by
6References
15Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Nov 14, 1988 |
| Grant date | Apr 10, 1990 |
| Priority date | — |
| Expiry date | Nov 14, 2008 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02P5/50
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An original drum and a recording drum are driven independently by individual synchronous motors. Encoders output respective rotation timing pulses (P.sub.a, P.sub.b) at every rotation of the recording drum and the original drum. If an interval separating the timing pulses (P.sub.a, P.sub.b) becomes smaller than a prescribed value, a scanning line deviation control circuit generates a motor control signal (T.sub.b) which interrupts the delivery of electrical power to the faster moving motor for a limited period such as to restore a correct relationship between the timing pulses.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.