Abstract: A driving signal generation circuit generates a main driving signal including, in each of driving periods, at least a first sub driving signal including a first driving pulse and a second driving pulse, and a second sub driving signal including a third driving pulse and provided before the first sub driving signal. A driving signal supply circuit includes a first dot generator supplying the first sub driving signal but not supplying the second sub driving signal to an actuator coupled with a vibration plate defining a portion of a pressure chamber, and a second dot generator supplying the first sub driving signal and the second sub driving signal to the actuator.

Abstract: A liquid injection device includes a liquid injection head and a controller including a driving signal generator generating a driving signal including, in one liquid drop injection period, a first driving pulse and a second driving pulse, and a driving signal supplier. The first driving pulse maintains the pressure chamber in an expanded state for a time period of about (½)×Tc; and the second driving pulse starts at a timing that is about n×Tc after the start of the first driving pulse, n being an integer satisfying n?2, to maintain the pressure chamber in the expanded state for the time period of about (½)×Tc, and to inject the second liquid drop at a speed higher than, or equal to, a speed at which the first liquid drop is injected.

Abstract: A driving signal generating circuit generates, for each driving period, a main driving signal including a first sub driving signal including a first driving pulse, a second sub driving signal including a second driving pulse, and a third sub driving signal including a third driving pulse. The third sub driving signal follows the second sub driving signal. A driving signal supplying circuit includes a second dot former to supply the second sub driving signal and the third sub driving signal to an actuator coupled to a defining plate defining a portion of a pressure chamber, without supplying the first sub driving signal to the actuator. The third driving pulse starts after a lapse of a preset time from the start of the second driving pulse. The preset time is equal to a value of about p×Tc, where p is greater than 2.

Abstract: A driving signal generating circuit generates, for each driving period, a main driving signal including a first sub driving signal including a first driving pulse, a second sub driving signal including a second driving pulse, and a third sub driving signal including a third driving pulse. The third sub driving signal follows the second sub driving signal. A driving signal supplying circuit includes a second dot former to supply the second sub driving signal and the third sub driving signal to an actuator coupled to a defining plate defining a portion of a pressure chamber, without supplying the first sub driving signal to the actuator. The third driving pulse starts after a lapse of a preset time from the start of the second driving pulse. The preset time is equal to a value of about p×Tc, where p is greater than 2.

Abstract: A driving signal generation circuit generates a main driving signal including, in each of driving periods, at least a first sub driving signal including a first driving pulse and a second driving pulse, and a second sub driving signal including a third driving pulse and provided before the first sub driving signal. A driving signal supply circuit includes a first dot generator supplying the first sub driving signal but not supplying the second sub driving signal to an actuator coupled with a vibration plate defining a portion of a pressure chamber, and a second dot generator supplying the first sub driving signal and the second sub driving signal to the actuator.

Abstract: A liquid injection device includes a driving circuit supplying, to an actuator, a driving signal including a prior driving pulse and a subsequent driving pulse supplied after the prior driving pulse.

Abstract: A liquid injection device includes a driving signal correction circuit correcting a reference driving signal based on a temperature detected by a temperature sensor. The driving signal correction circuit includes a first correction circuit that corrects injection pulses excluding a liquid drop injection speed-controlling injection pulse when the temperature detected by the temperature sensor is lower than or equal to a predetermined reference temperature, and a second correction circuit that corrects all of the injection pulses when the temperature detected by the temperature sensor is higher than the predetermined reference temperature.

Abstract: A liquid injection device includes a driving circuit supplying, to an actuator, a driving signal including a prior driving pulse and a subsequent driving pulse supplied after the prior driving pulse.

Abstract: A liquid injection device includes a driving signal correction circuit correcting a reference driving signal based on a temperature detected by a temperature sensor. The driving signal correction circuit includes a first correction circuit that corrects injection pulses excluding a liquid drop injection speed-controlling injection pulse when the temperature detected by the temperature sensor is lower than or equal to a predetermined reference temperature, and a second correction circuit that corrects all of the injection pulses when the temperature detected by the temperature sensor is higher than the predetermined reference temperature.

Abstract: A liquid injection device includes a driving signal generation circuit generating a driving signal, and a driving signal supply circuit supplying a portion of, or an entirety of, the driving signal to the actuator. The driving signal generation circuit generates at least one driving pulse included in a dedicated large dot driving signal before a small dot driving signal and a medium dot driving signal. The driving signal supply circuit includes a small dot supplier supplying the small dot driving signal to the actuator; a medium dot supplier supplying the medium dot driving signal, and not supplying the small dot driving signal, to the actuator; and a large dot supplier supplying the small dot driving signal, the medium dot driving signal and the dedicated large dot driving signal to the actuator.

Abstract: A liquid injection device includes a liquid injection head and a controller that generates a driving signal including first through fourth driving pulses in one liquid drop injection period and supplies the driving signal to the liquid injection head. The discharge time period of each of the first and second driving pulses is preferably set to about (½)×Tc. The start timing of the second driving pulse is preferably set to about m×Tc (m?1) after the start of the first driving pulse. The second ink drop is preferably set to be injected at a speed of the first ink drop or higher. The start timing of the third driving pulse is preferably set to about (n+(½))×Tc (n?1) after the start of the second driving pulse. The start timing of the fourth driving pulse is preferably set to about p×Tc (p?2) after the start of the third driving pulse. The fourth ink drop is injected at a speed of the third ink drop or higher.

Abstract: A liquid injection device includes a liquid injection head and a controller that generates a driving signal including first through fourth driving pulses in one liquid drop injection period and supplies the driving signal to the liquid injection head. The discharge time period of each of the first and second driving pulses is preferably set to about (½)×Tc. The start timing of the second driving pulse is preferably set to about m×Tc (m?1) after the start of the first driving pulse. The second ink drop is preferably set to be injected at a speed of the first ink drop or higher. The start timing of the third driving pulse is preferably set to about (n+(½))×Tc (n?1) after the start of the second driving pulse. The start timing of the fourth driving pulse is preferably set to about p×Tc (p?2) after the start of the third driving pulse. The fourth ink drop is injected at a speed of the third ink drop or higher.

Abstract: A liquid injection device includes a liquid injection head and a controller including a driving signal generator generating a driving signal including, in one liquid drop injection period, a first driving pulse and a second driving pulse, and a driving signal supplier. The first driving pulse maintains the pressure chamber in an expanded state for a time period of about (½)×Tc; and the second driving pulse starts at a timing that is about n×Tc after the start of the first driving pulse, n being an integer satisfying n?2, to maintain the pressure chamber in the expanded state for the time period of about (½)×Tc, and to inject the second liquid drop at a speed higher than, or equal to, a speed at which the first liquid drop is injected.