Liquid droplet-jetting head, liquid droplet-jetting apparatus, and liquid droplet-jetting method
AssigneeBrother Kogyo Kabushiki Kaisha
InventorHiroyuki Ishikawa
Life of this patent
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Abstract
In an ink-jet head having a plurality of nozzles for discharging liquid droplets, vibration is generated in a direction connecting two nozzles, of the nozzles, by the discharge operation performed at least one of the nozzles. In particular, when the printing frequency is in the vicinity of the secondary mode frequency (for example, 27.5 kHz) of the proper vibration of the ink-jet head, the crosstalk easily arises. The crosstalk is hardly caused when the ratio of the secondary mode frequency of the ink-jet head to the printing frequency is any one of a value of not more than 0.85, a value in a range of 1.25 to 1.96, and a value of not less than 4.59.
Claims19
A liquid droplet-jetting head which jets liquid droplets at a predetermined resolution while moving relative to an object, the liquid droplet-jetting head comprising:
- a flow passage unit which has a plurality of nozzles for discharging the liquid droplets and a nozzle surface in which the nozzles are formed;
- wherein a ratio of a secondary mode frequency of inter-nozzle proper vibration in relation to an inter-nozzle direction along a line connecting a nozzle of the nozzles and another nozzle in the nozzle surface, to a jetting frequency which is a reciprocal of time required for the object to move relative to the liquid droplet-jetting head by a unit distance corresponding to the predetermined resolution, is one of a value of-not more than 0.85, a value in a range of 1.25 to 1.96, and a value of not less than 3.44.
A liquid-jetting apparatus which jets a liquid to an object, the liquid-jetting apparatus comprising:
- a moving mechanism which moves the object in a predetermined direction;
- and
- a head which jets the liquid at a predetermined resolution while moving relative to the object, and which includes:
- a flow passage unit which has a plurality of nozzles for discharging liquid-droplets of the liquid, a plurality of pressure chambers communicated with the nozzles, and a nozzle surface having the nozzles formed therein;
- and an actuator unit which is formed in the flow passage on a side opposite to the nozzle surface so as to face the pressure chambers, and which applies a pressure to the pressure chambers, wherein:
- a ratio of a secondary mode frequency of inter-nozzle proper vibration in relation to an inter-nozzle direction along a line connecting a nozzle of the nozzles and another nozzle in the nozzle surface, to a frequency which is a reciprocal of time required for the object to move relative to the head by a unit distance corresponding to the predetermined resolution, is one of a value of not more than 0.85, a value in a range of 1.25 to 1.96, and a value of not less than 3.44.
A liquid droplet-jetting method for jetting liquid droplets by using a liquid droplet-jetting head which jets the liquid droplets at a predetermined resolution while moving relative to an object, the liquid droplet-jetting method comprising:
- preparing the liquid droplet-jetting head provided with a flow passage unit which has a plurality of nozzles for discharging the liquid droplets and a nozzle surface in which the nozzles are formed;
- and
- determining a jetting frequency so that a ratio of a secondary mode frequency of inter-nozzle proper vibration in relation to an inter-nozzle direction along a line connecting a nozzle of the nozzles and another nozzle in the nozzle surface, to the jetting frequency which is a reciprocal of time required for the object to move relative to the liquid droplet-jetting head by a unit distance corresponding to the predetermined resolution, is one of a value of not more than 0.85, a value in a range of 1.25 to 1.96, and a value of not less than 3.44.
Dependencies are inferred from the claim text.