Controller and method for activating a print head
AssigneeCanon Production Printing Holding B.V.
InventorsUlrich Stöckle, Florian Hitzlsperger
Life of this patent
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Abstract
A controller for operating a print head is described, which controller is designed to shift the activation points in time of the print head for printing of different lines of a print image on a recording medium relative to the line signal points in time, said line signal points in time being dependent on the transport velocity of the recording medium, such that the print head is operated with quantized operating frequencies from a set of predefined quantized operating frequencies. The print quality of the print head may thus be increased.
Claims12
A controller for a print head that is adapted to print lines of a print image line by line onto a recording medium, wherein, for the printing of a current line, the controller is configured to:
- detect a line signal indicative of a line signal point in time for printing the current line based on a transport velocity of the recording medium;
- determine an activation point in time for printing the current line on the basis of the line signal point in time, depending on:
- a set of possible quantized operating frequencies of the print head, and an accumulated quantization error produced upon printing of one or more preceding lines;
- and
- control the print head to print the current line at the activation point in time.
A method for operating a print head that is adapted to print lines of a print image line by line on a recording medium, wherein, for the printing of a current line, the method comprising:
- detecting a line signal indicative of a line signal point in time for printing of the current line based on a transport velocity of the recording medium;
- determining an activation point in time for printing of the current line on the basis of the line signal point in time, depending on:
- a set of possible quantized operating frequencies of the print head, and an accumulated quantization error produced in the printing of one or more preceding lines;
- and
- controlling the print head to print the current line at the activation point in time.
Dependencies are inferred from the claim text.