Image forming apparatus with dark current compensation for automatic power control (APC)
US9256154B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Aug 25, 2014 |
| Grant date | Feb 9, 2016 |
| Priority date | — |
| Expiry date | Aug 25, 2034 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03G2215/0404
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
An image forming apparatus, including: a laser light source supplied with a bias current and a superimposed current to emit laser light; a splitting unit configured to split the laser light into first and second laser lights; a photoelectric conversion unit configured to output a voltage corresponding to a light intensity of the second laser light; a voltage holding unit configured to hold a voltage output from the photoelectric conversion unit with not the superimposed current but the bias current being supplied to the laser light source; a voltage conversion unit configured to remove the voltage held by the voltage holding unit from the voltage from the photoelectric conversion unit which receives the second laser light; and a current control unit configured to control, based on a voltage from the voltage conversion unit, a value of the superimposed current supplied to the laser light source based on image data.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.