Patent ID: 7008035

Claim:
In combination, a print head and a printing apparatus which performs printing by moving a carriage unit, capable of holding said printhead having a plurality of heater resistances, over a print medium based on information transmitted by an external apparatus, said printhead comprising: a switching device for controlling each of the plurality of heater resistances; and a detection resistance having a property corresponding to a resistance property of the heater resistances; said printing apparatus comprising: a voltage control unit for adjusting a driving voltage generated in said printing apparatus, said voltage control unit comprising a voltage converter for providing a voltage to the heater resistances, a PWM controller for controlling a pulse signal inputted into said voltage converter in order to adjust the voltage provided by said voltage converter, first internal resistances for dividing the voltage provided by said voltage converter into a first divided voltage, a second internal resistance, connected with the detection resistance, for dividing a voltage into a second divided voltage, and a comparison circuit for comparing the first divided voltage with the second divided voltage, and outputting the comparison result to said PWM controller, wherein said detection resistance is manufactured by the same semiconductor deposition process as the heater resistances, and said voltage control unit is provided on the carriage unit.