Control of a light emitting diode array
US4455562A · kind A · utility
192Cited by
5References
10Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Aug 14, 1981 |
| Grant date | Jun 19, 1984 |
| Priority date | — |
| Expiry date | Aug 14, 2001 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S347/90
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
This invention relates to circuitry for non-impact printers that use light emitting diodes (LED's) to produce an image on a photoconductor and for controlling the output of each LED of a light emitting diode array that is part of the printer. A binary weighted duty cycle control is used to obtain substantial uniformity in the light emitted from each LED. The binary cycle is time related so that through use of a four-bit code, sixteen outputs are available which yield sixteen periods during which an LED may be enabled.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.