Patent ID: 6390589
Filing Date: 2002-05-21
Classification: B41J

Abstract:
A head substrate for an inkjet head discharging ink liquid retained in an ink retaining portion by an ink discharge mechanism in accordance with printing data inputted from the outside into a data input portion, comprising:one base substrate having a specific position on the surface thereof for said ink retaining portion to be arranged; a heater element provided to said ink discharge mechanism and formed on said base substrate in a position below said ink retaining portion for bubbling ink liquid by the application of heat; a fuse array storing various freely readable data by selective fusing, said fuse array being formed in a layer beneath said heater element and being covered by a protection layer for protecting said heater element; and a fuse logic circuit for controlling the operation of selective fusing of said fuse array and data reading, wherein said fuse array and said fuse logic circuit are arranged in a position in the direction orthogonal to the surface of said base substrate, but not overlapping with said ink retaining portion.