Print head and image forming apparatus using multiplexed compensation data
AssigneeOki Data Corporation
InventorToshiki Sato
Life of this patent
Estimating the term…
Abstract
A print head has driver circuitry that dynamically drives a row of driven elements, such as light-emitting elements, by driving different combinations of first and second terminals. The print head includes memory circuits storing compensation data for the driven elements, and multiplexing circuits that select the compensation data according to the combination of terminals being driven, thereby enabling the compensation data to be stored in the print head despite the use of dynamic driving. The compensation data are used in adjusting the amount of energy supplied to the driven elements. The amount of compensation data to be stored may be reduced by sharing the upper bits of the compensation data among a group of driven elements.
Claims13
A print head having a row of driven elements, a plurality of first terminals each connected to a plurality of the driven elements, a plurality of second terminals each connected to a plurality of the driven elements, and driver circuitry for driving the driven elements by driving the first terminals and the second terminals, each driven element being driven through a different combination of one of the first terminals and one of the second terminals, the print head comprising:
- means for storing compensation data for the driven elements, the compensation data specifying amounts of energy to be supplied by the driver circuitry to the first terminals;
- and
- means for selecting the stored compensation data according to the combination of the first terminals and the second terminals driven by the driver circuitry, and supplying the selected compensation data to the driver circuitry.
Dependencies are inferred from the claim text.