Liquid jet head, liquid jet recording apparatus, and method of controlling liquid jet head
There are provided a liquid jet head and so on capable of increasing the ejection reliability. A liquid jet head according to an embodiment of the present disclosure includes a jet unit including a plurality of nozzles, a plurality of pressure chambers which is individually communicated with the plurality of nozzles, and which is filled with the liquid, a liquid supply chamber configured to supply the liquid to insides of the pressure chambers, and a liquid recovery chamber configured to recover the liquid from the insides of the pressure chambers, and a drive unit configured to drive the jet unit based on a drive signal to jet the liquid which fills the inside of the pressure chamber from the nozzle. The drive unit drives the jet unit based on a first drive signal as the drive signal when performing a printing operation on a recording target medium so as to achieve ejection strength lower than meniscus breaking strength of breaking a meniscus in the jet unit, and drives the jet unit based on a second drive signal as the drive signal when performing a flushing operation as a non-printing operation of performing dummy ejection of the liquid from the nozzle so as to achieve the ejection strength higher than the meniscus breaking strength.
1 . A liquid jet head comprising:
a jet unit including a plurality of nozzles configured to jet a liquid, a plurality of pressure chambers which is individually communicated with the plurality of nozzles, and which is filled with the liquid, a liquid supply chamber configured to supply the liquid to insides of the pressure chambers, and a liquid recovery chamber configured to recover the liquid from the insides of the pressure chambers; and
a drive unit configured to drive the jet unit based on a drive signal to jet the liquid which fills the inside of the pressure chamber from the nozzle, wherein
the drive unit is configured to
drive the jet unit based on a first drive signal as the drive signal when performing a printing operation on a recording target medium so as to achieve ejection strength lower than meniscus breaking strength of breaking a meniscus in the jet unit, and
drive the jet unit based on a second drive signal as the drive signal when performing a flushing operation as a non-printing operation of performing dummy ejection of the liquid from the nozzle so as to achieve the ejection strength higher than the meniscus breaking strength.
2 . The liquid jet head according to claim 1 , wherein
the drive unit is configured to increase a drive voltage in the second drive signal to a value higher than a first threshold value corresponding to the meniscus breaking strength to thereby set the ejection strength to be higher than the meniscus breaking strength.
3 . The liquid jet head according to claim 1 , wherein
the drive unit is configured to increase a drive frequency in the second drive signal to a value higher than a second threshold value corresponding to the meniscus breaking strength to thereby set the ejection strength to be higher than the meniscus breaking strength.
4 . The liquid jet head according to claim 1 , wherein
the drive unit is configured to increase a number of pulses included in one cycle in the second drive signal to a value higher than a third threshold value corresponding to the meniscus breaking strength to thereby set the ejection strength to be higher than the meniscus breaking strength.
5 . The liquid jet head according to claim 1 , wherein
the drive unit is configured to set a pulse width in a pulse included in the second drive signal to a resonance period (AP) to thereby set the ejection strength to be higher than the meniscus breaking strength.
6 . The liquid jet head according to claim 1 , wherein
the jet unit further includes a bypass flow channel configured to communicate the liquid supply chamber and the liquid recovery chamber with each other.
7 . A liquid jet recording apparatus comprising:
the liquid jet head according to claim 1 .
8 . A method of controlling a liquid jet head provided with a jet unit including a plurality of nozzles configured to jet a liquid, a plurality of pressure chambers which is individually communicated with the plurality of nozzles, and which is filled with the liquid, a liquid supply chamber configured to supply the liquid to insides of the pressure chambers, and a liquid recovery chamber configured to recover the liquid from the insides of the pressure chambers, the method comprising:
jetting the liquid which fills the inside of the pressure chamber from the nozzle by driving the jet unit based on a drive signal, wherein
the jetting the liquid from the nozzle includes
driving the jet unit based on a first drive signal as the drive signal when performing a printing operation on a recording target medium so as to achieve ejection strength lower than meniscus breaking strength of breaking a meniscus in the jet unit, and
driving the jet unit based on a second drive signal as the drive signal when performing a flushing operation as a non-printing operation of performing dummy ejection of the liquid from the nozzle so as to achieve the ejection strength higher than the meniscus breaking strength.