Inkjet recording apparatus and method for controlling it
AssigneeCanon Kabushiki Kaisha
InventorsSusumu Hirosawa, Yuji Kanome, Hiroyuki Tanaka, Yoshiaki Suzuki, Masahiro Sugimoto, Seiji Suzuki, Takeaki Nakano
Life of this patent
Estimating the term…
Abstract
In order to efficiently perform preliminary ejection of ink at a bend of an ink circulation passage, the number of preliminary ejections of a nozzle group located on the outer side of the bend is set larger than the number of preliminary ejections of a nozzle group located in the middle of the bend.
Claims15
An inkjet recording apparatus that records an image on a recording medium using a recording head having a plurality of nozzle rows in which nozzles for ejecting ink are arranged, the apparatus comprising:
- an ink passage for supplying ink to the plurality of nozzle rows;
- a circulation unit configured to circulate ink in the ink passage;
- and
- a preliminary ejection unit configured to preliminarily eject ink from the plurality of nozzle rows,
- wherein the preliminary ejection unit preliminarily ejects ink from the plurality of nozzle rows in such a manner that the amount of ink preliminarily ejected from a nozzle group located on the outer side of a bend of the ink passage is larger than the amount of ink preliminarily ejected from a nozzle group located in the middle of the bend of the ink passage.
An inkjet recording apparatus that records an image on a recording medium using a recording head having a first nozzle row and a second nozzle row in which nozzles for ejecting ink are arranged in a predetermined direction, the first nozzle row and the second nozzle row being staggered in the predetermined direction and a direction perpendicular to the predetermined direction, the apparatus comprising:
- a circulation unit configured to cause ink to flow in one direction of an ink passage corresponding to the first nozzle row and the second nozzle row and connecting a first end in the predetermined direction of the first nozzle row and a second end in the predetermined direction of the second nozzle row and to thereby circulate ink supplied to the nozzles;
- and
- a preliminary ejection unit configured to preliminarily eject ink from the first nozzle row and the second nozzle row,
- wherein the preliminary ejection unit preliminarily ejects ink from the first nozzle row and the second nozzle row in such a manner that the amount of ink preliminarily ejected from a nozzle group including at least a nozzle at the first end and the amount of ink preliminarily ejected from a nozzle group including at least a nozzle at the second end are each larger than the amount of ink preliminarily ejected from the other nozzle group.
A method for controlling an inkjet recording apparatus that records an image on a recording medium using a recording head having a first nozzle row and a second nozzle row in which nozzles for ejecting ink are arranged in a predetermined direction, the first nozzle row and the second nozzle row being staggered in the predetermined direction and a direction perpendicular to the predetermined direction, the method comprising:
- a circulation step of causing ink to flow in one direction of an ink passage corresponding to the first nozzle row and the second nozzle row and connecting a first end in the predetermined direction of the first nozzle row and a second end in the predetermined direction of the second nozzle row and thereby circulating ink supplied to the nozzles;
- and
- a preliminary ejection step of preliminarily ejecting ink from the first nozzle row and the second nozzle row,
- wherein in the preliminary ejection step, ink is preliminarily ejected from the first nozzle row and the second nozzle row in such a manner that the amount of ink preliminarily ejected from a nozzle group including at least a nozzle at the first end and the amount of ink preliminarily ejected from a nozzle group including at least a nozzle at the second end are each larger than the amount of ink preliminarily ejected from the other nozzle group.
Dependencies are inferred from the claim text.