Pulse width control circuit
US4700367A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 16, 1985 |
| Grant date | Oct 13, 1987 |
| Priority date | — |
| Expiry date | Dec 16, 2005 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03K5/1502
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A pulse width control circuit for providing a control signal to adjust variations of electrical characteristics among a plurality of printing elements has an up/down counter and a plurality of control signal generating circuits. The up/down counter counts the number of pulses of a clock signal and delivers the counted value. The control signal generating circuit compares the counted values from the up/down counter with set values corresponding to conduction time periods of the currents used for driving light emitting diodes, and generates a plurality of control pulse signals having pulse widths whose central positions thereof are in accord with each other.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.