Light output power monitor for a LED printhead
US5016027A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Dec 4, 1989 |
| Grant date | May 14, 1991 |
| Priority date | — |
| Expiry date | Dec 4, 2009 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB41J2/45
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
A light output monitor for a light emitting diode printhead has a light detector internal to the printhead for measuring the light output power of each light emitting diode along a printhead. Calibration factors relating the light output power measured by the detector to the light output power transmitted to the photoreceptive surface of the printer are stored in memory on the printhead. An exposure control device regulates the amount of time each light emitting diode in the printhead exposes the photoreceptive surface with light. A processor periodically and aperiodically uses the light output measurements and the calibration factors to compensate the exposure control device for light output power non-uniformities and temporal irregularities.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.