Ink jet printing apparatus and ink jet printing method
AssigneeCanon Kabushiki Kaisha
InventorsYuhei Oikawa, Taku Yokozawa, Hiroaki Shirakawa, Mitsutoshi Nagamura, Hiroshi Taira, Satoshi Azuma, Yosuke Ishii, Hiroaki Komatsu
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Abstract
A driving pulse to be applied is changed when an overlapped level of invert timing of driving pulse is large.
Claims18
An ink jet printing apparatus for performing printing by using a print head that includes a substrate and a plurality of printing element arrays provided on the substrate and that ejects ink according to transmitted data, each of the plurality of printing element arrays having a plurality of printing elements which generates energy for ejecting ink by applying a driving pulse, the driving pulse comprising a pre-pulse which is applied in a period from a first timing to a second timing, and a main pulse which is applied in a period from a third timing which is later than the first timing to a fourth timing, the ink jet printing apparatus comprising:
- a first determination unit configured to determine a plurality of first driving pulses corresponding to the plurality of printing element arrays;
- an obtaining unit configured to obtain an overlapping value indicating the number of overlapped timings among the first, second, third, and fourth timings of the plurality of first driving pulses;
- a second determination unit configured to determine a plurality of second driving pulses to be applied to the plurality of printing element arrays according to the overlapping value;
- a control unit configured to control ejecting ink from the plurality of printing element arrays based on the plurality of second driving pulses, wherein
- the second determination unit
- determines the plurality of first driving pulses as the plurality of second driving pulses when the overlapping value is smaller than a predetermined threshold, and
- determines a plurality of third driving pulses as the plurality of second driving pulses when the overlapping value is larger than the predetermined threshold, wherein the plurality of third driving pulses is different from the plurality of first driving pulses, and the overlapping value corresponding to the number of overlapped timings among the first, second, third, and fourth timings of the plurality of third driving pulses is smaller than the predetermined threshold.
Dependencies are inferred from the claim text.