Patent ID: 7431418

Claim:
An ink box detection system for detecting an ink box installed in an ink jet apparatus, the ink box having an identification circuit, said ink box detection system comprising: a voltage divider resistance and a power supply; an ink box connector, one end of the ink box connector being connected to the identification circuit of the ink box, and the other end of the ink box connector being connected to the voltage divider resistance and the power supply; a voltage supplier for providing an adjustable voltage; a voltage detector, connected to the ink box connector and the voltage supplier, comprising a single comparator for comparing a reference voltage generated by the identification circuit with the adjustable voltage and outputting a detection signal when the reference voltage is the same with the adjustable voltage; and a controller connected to the voltage supplier and the voltage detector for outputting an adjustable digital signal to the voltage supplier to adjust the adjustable voltage and receiving the detection signal from the voltage detector to identify the kind of the ink box.