Liquid ejecting apparatus, drive circuit, and integrated circuit

Abstract

A liquid ejecting apparatus includes an ejecting unit, and first and second integrated circuits mounted respectively on front and rear surfaces of the circuit substrate. Each of the first and second integrated circuits includes a first terminal to which the first voltage is applied, and a second terminal to which the second voltage is applied. A distance between the first terminals of the first and second integrated circuits is shorter than a distance between the first terminal of the first integrated circuit and the second terminal of the second integrated circuit. A distance between the second terminal of the first integrated circuit and the second terminal of the second integrated circuit is shorter than a distance between the second terminal of the first integrated circuit and the first terminal of the second integrated circuit.

What is claimed is: 
     
         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 driving the piezoelectric element in accordance with a first voltage and a second voltage; and   a second drive circuit that is mounted on a rear surface of the circuit substrate and generates a second drive signal driving the piezoelectric element in accordance with the first voltage and the second voltage,   wherein the first drive circuit is integrated into a first integrated circuit,   wherein the second drive circuit is integrated into a second integrated circuit,   wherein each of the first integrated circuit and the second 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 first integrated circuit and the second integrated circuit are disposed on the circuit substrate such that a distance between the first terminal of the first integrated circuit and the first terminal of the second integrated circuit is shorter than a distance between the first terminal of the first integrated circuit and the second terminal of the second integrated circuit, and   wherein the first integrated circuit and the second integrated circuit are disposed on the circuit substrate such that a distance between the second terminal of the first integrated circuit and the second terminal of the second integrated circuit is shorter than a distance between the second terminal of the first integrated circuit and the first terminal of the second integrated circuit.   
     
     
         2 . The liquid ejecting apparatus according to  claim 1 ,
 wherein the first voltage is applied to the first terminal of the first integrated circuit and the first terminal of the second integrated circuit through a first wire, and   wherein the second voltage is applied to the second terminal of the first integrated circuit and the second terminal of the second integrated circuit through a second wire.   
     
     
         3 . The liquid ejecting apparatus according to  claim 1 ,
 wherein each of the first integrated circuit and the second integrated circuit further includes an additional first terminal and an additional second terminal,   Wherein, in each of the first integrated circuit and the second integrated circuit, the first terminal and the second terminal are arranged on a first side and the additional first terminal and the additional second terminal are arranged on a second side.   
     
     
         4 . The liquid ejecting apparatus according to  claim 1 ,
 wherein, in each of the first integrated circuit and the second integrated circuit, the first side intersects the second side at an intersection corner,   wherein, in each of the first integrated circuit and the second integrated circuit, the first terminal and the second terminal are arranged in this order from an intersection corner side toward a direction away from the intersection corner along the first side, and the additional first terminal and the additional second terminal are arranged in this order from an intersection corner side toward a direction away from the intersection corner along the second side.   
     
     
         5 . The liquid ejecting apparatus according to  claim 4 ,
 wherein, in each of the first integrated circuit and the second integrated circuit, positions of the first terminal and the second terminal are line-symmetrical to positions of the additional first terminal and the additional second terminal with respect to a diagonal line passing through the intersection corner.   
     
     
         6 . The liquid ejecting apparatus according to  claim 1 ,
 wherein the first terminal of the second integrated circuit is disposed between the first terminal of the first integrated circuit and the second terminal of the first integrated circuit in a plan view.   
     
     
         7 . A drive circuit comprising:
 an integrated circuit that generates a drive signal in accordance with a first voltage and a second voltage, and drives a load in accordance with the drive signal, the integrated circuit including,
 a first terminal group and a second terminal group, with each of the first terminal group and the second terminal group including a first terminal to which the first voltage is applied, and a second terminal to which the second voltage is applied, 
   wherein the first terminal and the second terminal in the first terminal group are arranged on a first side of the integrated circuit, and   wherein the first terminal and the second terminal in the second terminal group are arranged on a second side of the integrated circuit.   
     
     
         8 . The drive circuit according to  claim 7 ,
 wherein the integrated circuit generates the drive signal in accordance with the first voltage, the second voltage, a third voltage and a fourth voltage,   wherein each of the first terminal group and the second terminal group further includes a third terminal to which the third voltage is applied and a fourth terminal to which the fourth voltage is applied,   wherein the first terminal, the second terminal, the third terminal and the fourth terminal in the first terminal group are arranged on the first side of the integrated circuit, and   wherein the first terminal, the second terminal, the third terminal and the fourth terminal in the second terminal group are arranged on the second side of the integrated circuit.   
     
     
         9 . The drive circuit according to  claim 8 ,
 wherein the first side of the integrated circuit intersects the second side of the integrated circuit at an intersection corner,   wherein the first terminal, the second terminal, the third terminal and the fourth terminal in the first terminal group are arranged in this order from an intersection corner side toward a direction away from the intersection corner along the first side of the integrated circuit, and   wherein the first terminal, the second terminal, the third terminal, and the fourth terminal in the second terminal group are arranged in this order from an intersection corner side toward a direction away from the intersection corner along the second side of the integrated circuit.   
     
     
         10 . The drive circuit according to  claim 9 ,
 wherein positions of the first terminal, the second terminal, the third terminal and the fourth terminal in the first terminal group are line-symmetrical to positions of the first terminal, the second terminal, the third terminal and the fourth terminal in the second terminal group with respect to a diagonal line passing through the intersection corner.   
     
     
         11 . The drive circuit according to  claim 7 , further comprising
 a circuit substrate with the integrated circuit being mounted on a front surface of the circuit substrate, and   an additional integrated circuit mounted on a rear surface of the circuit substrate,   wherein the additional integrated circuit generates a drive signal in accordance with the first voltage and the second voltage, and drives a load in accordance with the drive signal, the additional integrated circuit including,
 a first terminal group and a second terminal group, with each of the first terminal group and the second terminal group including a first terminal to which the first voltage is applied, and a second terminal to which the second voltage is applied, 
   wherein the first terminal and the second terminal in the first terminal group are arranged on a first side of the additional integrated circuit, and   wherein the first terminal and the second terminal in the second terminal group are arranged on a second side of the additional integrated circuit.   
     
     
         12 . The drive circuit according to  claim 11 ,
 wherein the first terminal in the first terminal group of the additional integrated circuit is disposed between the first terminal and the second terminal in the first terminal group of the integrated circuit in a plan view, and   wherein the first terminal in the second terminal group of the additional integrated circuit is disposed between the first terminal and the second terminal in the second terminal group of the integrated circuit in the plan view.   
     
     
         13 . The drive circuit according to  claim 7 ,
 wherein the integrated circuit further includes a third terminal group and a fourth terminal group each including the first terminal to which the first voltage is applied and the second terminal to which the second voltage is applied,   wherein the first terminal and the second terminal in the third terminal group are arranged on a third side of the integrated circuit, and   wherein the first terminal and the second terminal in the fourth terminal group are arranged on a fourth side of the integrated circuit.   
     
     
         14 . The drive circuit according to  claim 13 ,
 wherein the integrated circuit generates the drive signal in accordance with the first voltage, the second voltage, a third voltage and a fourth voltage,   wherein each of the first terminal group, the second terminal group, the third terminal group and the fourth terminal group further includes a third terminal to which the third voltage is applied and a fourth terminal to which the fourth voltage is applied,   wherein the first terminal, the second terminal, the third terminal and the fourth terminal in the first terminal group are arranged on the first side of the integrated circuit,   wherein the first terminal, the second terminal, the third terminal and the fourth terminal in the second terminal group are arranged on the second side of the integrated circuit,   wherein the first terminal, the second terminal, the third terminal and the fourth terminal in the third terminal group are arranged on the third side of the integrated circuit, and   wherein the first terminal, the second terminal, the third terminal and the fourth terminal in the fourth terminal group are arranged on the fourth side of the integrated circuit.   
     
     
         15 . The drive circuit according to  claim 14 ,
 wherein the first side of the integrated circuit intersects the second side of the integrated circuit at a first intersection corner,   wherein the third side of the integrated circuit intersects the fourth side of the integrated circuit at a second intersection corner opposing the first intersection corner,   wherein the first terminal, the second terminal, the third terminal and the fourth terminal in the first terminal group are arranged in this order from a first intersection corner side toward a direction away from the first intersection corner along the first side of the integrated circuit,   wherein the first terminal, the second terminal, the third terminal, and the fourth terminal in the second terminal group are arranged in this order from a first intersection corner side toward a direction away from the first intersection corner along the second side of the integrated circuit,   wherein the first terminal, the second terminal, the third terminal and the fourth terminal in the third terminal group are arranged in this order from a second intersection corner side toward a direction away from the second intersection corner along the third side of the integrated circuit, and   wherein the first terminal, the second terminal, the third terminal and the fourth terminal in the fourth terminal group are arranged in this order from a second intersection corner side toward a direction away from the second intersection corner along the fourth side of the integrated circuit.   
     
     
         16 . The drive circuit according to  claim 15 ,
 wherein positions of the first terminal, the second terminal, the third terminal and the fourth terminal in the first terminal group are line-symmetrical to positions of the first terminal, the second terminal, the third terminal and the fourth terminal in the second terminal group with respect to a diagonal line passing through the first intersection corner and the second intersection corner, and   wherein positions of the first terminal, the second terminal, the third terminal and the fourth terminal in the third terminal group are line-symmetrical to positions of the first terminal, the second terminal, the third terminal and the fourth terminal in the fourth terminal group with respect to the diagonal line.