PURPOSE: To enable to drive at high speed without increasing the size of a substrate, by providing order selecting wires of a high electric current capacity so that a plurality of heating elements connected to order selecting terminals can be simultaneously driven.
CONSTITUTION: The heating elements of the same order in each group are divided into L sub-groups each of which consists of K (in the figure, 2) successive heating elements. In the substrate 1, common lead wires CL1WCLn are provided for each of the sub-groups, and lead wires led from the order selecting terminal side for the heating elements in each of the sub-groups are connected to corresponding common lead wires. On the other hand, common lead wires CL1'W CLn' connected to the common lead wires are provided at one main surface of a substrate 2, while order selectong wires SL1WSLn for connecting in common the common lead wires of the same order to each other are provided on the other main surface, and they are led out to corresponding order selecting terminals S1WSn. The corresponding common lead wires in the substrate 1 and the substrate 2 are laminated on each other, and are connected to each other by clamping.
SATOU KIYOSHI
SUZUKI TAKUMI
TERAJIMA MINORU
