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LIQUID EJECTING APPARATUS, DRIVE CIRCUIT, AND INTEGRATED CIRCUIT

  • US 20170266958A1
  • Filed: 03/01/2017
  • Published: 09/21/2017
  • Est. Priority Date: 03/18/2016
  • Status: Active Grant
First Claim
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1. A liquid ejecting apparatus comprising:

  • an ejecting unit that includes a piezoelectric element and ejects liquid by driving the piezoelectric element;

    a first drive circuit that is mounted on a front surface of a circuit substrate and generates a first drive signal from a first original drive signal which is an origin of the first drive signal driving the piezoelectric element in accordance with a first voltage and a second voltage higher than the first voltage; and

    a second drive circuit that is mounted on a rear surface of the circuit substrate and generates a second drive signal from a second original drive signal which is an origin of the second drive signal driving the piezoelectric element in accordance with the first voltage and the second voltage,wherein the first drive circuit includes,a first control circuit;

    a first pair of transistors to which the first voltage is applied; and

    a second pair of transistors which is electrically coupled in series to the first pair of transistors and to which the second voltage is applied,wherein the first control circuit is integrated into a first integrated circuit, and outputs a first control signal for controlling an operation of the first pair of transistors and a second control signal for controlling an operation of the second pair of transistors respectively, in accordance with the first original drive signal,wherein the second drive circuit includes,a second control circuit;

    a third pair of transistors to which the first voltage is applied; and

    a fourth pair of transistors which is electrically coupled in series to the first pair of transistors and to which the second voltage is applied,wherein the second control circuit is integrated into a second integrated circuit, and outputs a third control signal for controlling an operation of the third pair of transistors and a fourth control signal for controlling an operation of the fourth pair of transistors respectively, in accordance with the second original drive signal,wherein the first integrated circuit includes,a first terminal to which the first voltage is applied; and

    a second terminal to which the second voltage is applied,wherein the second integrated circuit includes,a third terminal to which the first voltage is applied; and

    a fourth terminal to which the second voltage is applied,wherein the first integrated circuit and the second integrated circuit are disposed on the circuit substrate such that a distance between the first terminal and the third terminal is shorter than a distance between the first terminal and the fourth terminal, andwherein the first integrated circuit and the second integrated circuit are disposed on the circuit substrate such that a distance between the second terminal and the fourth terminal is shorter than a distance between the second terminal and the third terminal.

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