Electrophotographic or ionographic printer with variable printing speed
AssigneeCSAT Gesellschaft fur Computer Systeme und Automations-Technik mbH
InventorHans Mathea
Life of this patent
Estimating the term…
Abstract
In a printer with an electrically chargeable image drum, such as a laser or a LED printer, for imprinting a medium by transferring toner to the medium, including, arranged around the image drum, a charging unit, a writing unit and a toner unit, the toner unit is disposed at a predetermined angular distance from the charging unit and a sensor is disposed at essentially the same angular distance from the charging unit to determine the charge of the image unit at the toner location for adjusting the voltage of at least one of the charging unit and the toner unit depending on the charge voltage of the image drum as determined by the sensor.
Claims7
A printer with an electrically chargeable image drum (2) such as an electrophotographic or ionographic printer, particularly a laser or LED printer, for imprinting a medium (1) wherein the image drum (2) serves to transfer toner to a medium, said printer further including a charging unit (2) for charging the image drum (2), a toner unit (4) by which toner is transferred to the image drum (2) and which is disposed at a predetermined angular distance α, in the direction of rotation (9) of the image drum (2), past the charging unit (3), a writing unit (5) generating a beam (5a) directed onto the surface of the image drum (2) for changing the electrical charge of the surface of the image drum (2) in accordance with an image to be imprinted onto the medium 1, and a sensor (6) arranged adjacent the image drum (2) also essentially at the predetermined angular distance α from the charging unit (3) for determining the charge of the image drum at the predetermined angular distance from the charging unit (3).
Dependencies are inferred from the claim text.