| 摘要 |
PURPOSE:To eliminate printing irregularity, by providing the connection terminal of the external lead to a first common conductor line to both terminal parts of the first common conductor line and providing the connection terminal of the external line to a second common conductor line to the central part of the second common conductor line. CONSTITUTION:The equivalent resistance RH(x) in the side of a common conductor line 110 for a power source containing lead wires 111, 112 is imparted by a parallel circuit of a lefthand line resistor RH1(x) and a righthand line resistor RH2(x) and RH1(x) and RH2(x) are respectively monotone increasing and monotone decreasing functions to (x) and, therefore, the equivalent resistance RH(x) changes in a convex shaped secondary line form. The equivalent resistance RG(x) of a common conductor line for the ground shown concave shaped linear distribution in relation to (x) because there is a connection terminal at a central part and the value thereof comes to almost 1/2 or less. As a result, the synthetic resistance value RT(x) being the sum total of RH(x), RG(x), the resistance R(x) of a heat generator and the ON-resistance r(x) of drive IC shows distribution near to a constant value. As mentioned above, by altering the position of the connection terminal to the conductor line, an equivalent resistance sum is made constant to reduce printing irregularity and the production yield of a head can be enhanced. |
