Patent ID: RE44825

Claim:
A print head substrate, comprising: a plurality of recording elements; a driver for driving said plurality of recording elements in accordance with image data; an input portion for inputting a pulse width definition signal to define a width of a driving pulse pulses to be applied respectively to said plurality of recording elements; driving means for dividing said plurality of recording elements into blocks, each of said blocks consisting of a predetermined number of said plurality of recording elements greater than 2 for a time-division driving of each said block as a unit; and an integration circuit comprising a resistive component and a capacitive component for producing, corresponding to an input of the pulse width definition signal, a plurality of drive pulses , for applying said driving pulses having the width defined by said pulse width definition signal to at least some of said plurality of recording elements in said a block of said blocks, the plurality of drive pulses being shifted by predetermined interval by a predetermined interval from one another, by a delay in rise of the drive pulses due to the resistive component and the capacitive component, wherein said driving pulses are applied to the least some of said plurality of recording elements in the block at a timing corresponding to the plurality of drive pulses shifted from one another .