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US 7,252,370 B2Granted
Inkjet printing head
AssigneeBrother Kogyo Kabushiki Kaisha
InventorAtsushi Hirota
Life of this patent
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Abstract
An inkjet printing head includes: an actuator unit; and a flow path unit onto whose surface the actuator unit is fixed, the flow path unit including: a common ink chamber having a plurality of outlets; a plurality of individual ink flow paths having a plurality of pressure chambers of which the volumes are changed by the actuator unit, the individual ink flow paths for leading ink from the respective outlets of the common ink chamber to respective nozzles through respective pressure chambers, the pressure chambers arranged along a plane in a form of matrix and each connected to the respective nozzles; and a plurality of adjustment portions provided at a side opposite to the actuator unit with respect to the pressure chambers and adjust compliances of each of the pressure chambers to be equalized.
Claims32
An inkjet printing head comprising:
- an actuator unit;
- and
- a flow path unit onto whose surface the actuator unit is fixed, the flow path unit including:
- a common ink chamber having a plurality of outlets, the common ink chamber being provided at a side opposite to the actuator unit with respect to a plurality of pressure chambers;
- a plurality of individual ink flow paths having the plurality of pressure chambers of which the volumes are changed by the actuator unit, the individual ink flow paths for leading ink from the respective outlets of the common ink chamber to respective nozzles through respective pressure chambers, the pressure chambers arranged along a plane in a form of matrix and each connected to the respective nozzles, the individual ink flow paths being classified into a plurality of types in accordance with facing area between the pressure chambers thereof and the common ink chamber;
- and
- a plurality of adjustment portions provided at a side opposite to the actuator unit with respect to the pressure chambers and adjust compliances of each of the pressure chambers belonging to the classified types of the individual ink flow paths to be equalized.
4 more elements
An inkjet printing head comprising:
- an actuator unit;
- and
- a flow path unit onto whose surface the actuator unit is fixed, the flow path unit including:
- a plurality of nozzles for ejecting ink, which are classified into four groups of a first through fourth nozzles;
- a common ink chamber having a plurality of outlets;
- a plurality of individual ink flow paths having a plurality of pressure chambers of which the volumes are changed by the actuator unit, the individual ink flow paths for leading ink from the respective outlets of the common ink chamber to the respective nozzles through respective pressure chambers, the pressure chambers arranged along a plane in a form of matrix and each connected to the respective nozzles;
- and
- a plurality of adjustment portions provided at a side opposite to the actuator unit with respect to the pressure chambers and adjust compliances of each of the pressure chambers to be equalized,
- wherein each of the pressure chambers are formed in a substantially quadrilateral flat shape having acute-angled portions diagonally, one of which is connected to one of the nozzles, and the pressure chambers are aligned in columns of a first through fourth pressure chamber columns extending in parallel to one another,
- wherein the common ink chamber includes first and second common ink flow paths extending in parallel to each other in a direction parallel to the pressure chamber columns,
- wherein in the pressure chambers included in the first pressure chamber column, one of the acute-angled portions is connected to the first common ink flow path and the other of the acute-angled portions is connected to one of the first nozzles,
- wherein in the pressure chambers included in the second pressure chamber column, one of the acute-angled portions that is adjacent to the one of the acute-angled portions in the first pressure chamber column and opposed to the pressure chambers of the first pressure chamber column, is connected to the first common ink flow path and the other of the acute-angled portions is connected to one of the second nozzles,
- wherein in the pressure chambers included in the third pressure chamber column, one of the acute-angled portions that is adjacent to the other of the acute-angled portions in the second pressure chamber column and opposed to the pressure chambers of the second pressure chamber column, is connected to one of the third nozzles and the other of the acute-angled portions is connected to the second common ink flow path,
- wherein in the pressure chambers included in the fourth pressure chamber column, one of the acute-angled portions that is adjacent to the other of the acute-angled portions in the third pressure chamber column and opposed to the pressure chambers of the third pressure chamber column, is connected to one of the fourth nozzles and the other of the acute-angled portions is connected to the second common ink flow path, and
- wherein the adjustment portions are provided along each of the first, second, third and fourth pressure chamber columns respectively.
12 more elements
Dependencies are inferred from the claim text.