Liquid ejecting apparatus and control method thereof

Abstract

To provide a liquid jetting device capable of preventing faulty jetting due to air bubbles by suppressing occurrence of cavitation in a liquid channel, and a method for controlling the same. A jetting driving pulse DP1 is a voltage waveform including an expansion element p1 to gently expand volume of a pressure generating chamber 21, an expansion maintaining element p2 to maintain potential VL1, a contraction element p3 to contract the volume of the pressure generating chamber 21, a contraction maintaining element p4 to maintain potential VH1, and a restoring element p5 to gently expand the volume of the pressure generating chamber 21. Time width Wd1 of the expansion element p1 is longer than time width Wh1 of the expansion maintaining element p2, and time width Wd2 of the restoring element p5 is longer than time width Wh2 of the contraction maintaining element p4, then first reference potential VB1 is set to be equal to or above 50% of the potential VH1 of the contraction maintainingelement p4. By applying the jetting driving pulse DP1 to a piezoelectric vibrator 26, flow velocity of ink jetted from a nozzle opening 28 is 0.36 mg / s or more.

Description

technical field [0001] The present invention relates to a liquid ejecting device including a liquid ejecting head such as an ink jet recording head and a control method thereof. Background technique [0002] A liquid ejecting device is a device that includes a liquid ejecting head capable of ejecting a liquid, and ejects various liquids from the liquid ejecting head. As a representative device of the liquid ejecting device, for example, an image recording device such as an ink jet printer (hereinafter simply referred to as a printer) equipped with an ink jet recording head (hereinafter referred to as a printer) as a liquid ejecting head can be mentioned. , simply referred to as a recording head), images and the like are recorded by ejecting and landing droplet-shaped ink from nozzles of the recording head on a recording medium (ejection object) such as recording paper. In addition, in recent years, it has been applied not only to this image recording device but also to vari...

AI Technical Summary

Problems solved by technology

[0006] However, in a printer having a structure in which the potential of the short drive pulse and the potential of the short stop period are switched by a switch, if the difference between the potential of the short drive pulse and the potential of the short stop period is set to be large, the pressure will increase. room deformed sharply

Due to the sudden change of the pressure chamber, it is difficult to reliably suppress the cavitation caused by the negative pressure in the liquid flow path

As a result, there is a problem that bubbles generated due to cavitation remain in the liquid flow path, and ejection failure occurs due to the pressure change absorbed by the bubbles.

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