Print head with light-emitting element driving correction
US5623300A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 2, 1993 |
| Grant date | Apr 22, 1997 |
| Priority date | — |
| Expiry date | Aug 2, 2013 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N1/40031
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A print head for reproducing a multi-level image is an provided. In the print head, a light-emitting array comprises a linear line of light-emitting elements. A D/A converter converts a multi-level image data to an analog signal, and an analog shift register shifts and latches the analog signals of a line received from the D/A converter. An analog latch register latches the analog signals held by the analog shift register. A driver controls the quantity of light of the light-emitting elements according to the analog signals latched by the analog latch register. In one embodiment, the print head includes a second analog shift register, an A/D converter a line memory and a divider which divides the image data by a signal from the line memory to produce corrected data which is provided to the driver to control driving of the light-emitting elements. In another embodiment, the print head includes an amplifier and a gain correction circuit having a sample and hold circuit from which the driver receives signals to control driving of the light-emitting elements.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.