Patent ID: 7300124
Filing Date: 2007-11-27
Classification: B41J

Abstract:
1. A recording head comprising: a plurality of recording elements connected to a first power source; a switching element which is serially connected to each of said recording elements and independently drives each of said recording elements by supplying a current thereto; and a voltage generating circuit for supplying a voltage for a control signal for controlling said switching element, wherein said voltage generating circuit has a first current-voltage conversion circuit connected to a predetermined electric potential, a first reference voltage which is generated by supplying a constant current to said first current-voltage conversion circuit or a voltage correlated to said first reference voltage is set as a control voltage, and an output voltage is determined by inputting said control voltage to a first transistor, wherein said voltage generating circuit further has a voltage control current source which is constructed by using a second transistor connected to said first power source and supplies said constant current, said voltage control current source is constructed so as to be controlled by an output voltage from a second current-voltage conversion circuit constructed by using a third transistor connected to said first power source, and a current which is inputted to said second current-voltage conversion circuit is correlated to an output current from a third voltage-current conversion circuit for generating a current on the basis of a second reference voltage between a voltage of a second power source and a grounding potential.