Patent ID: 7866776

Claim:
An ink jet head driving method comprising: transmitting, in accordance with print data received from an external circuit, a first drive pulse signal to a first actuator that is formed in a first ink chamber from which ink is to be discharged and that confronts a print area on a recording medium whereat printing is performed with the discharged ink during a printing operation, the first drive pulse signal comprising a reserve drive pulse signal transmitted to temporarily increase a volume of the first ink chamber from an original state to an expanded state and a discharge drive pulse signal transmitted sequentially with the reserve drive pulse signal to temporarily reduce the volume of the first ink chamber from the expanded state to a compressed state in which the volume of the first ink chamber is less than the volume thereof in the original state, thereby causing ink to be discharged from the first ink chamber to the confronting print area of the recording medium; and transmitting, in synchronization with the reserve drive pulse signal, a second drive pulse signal to a second actuator that is formed in a second ink chamber configured to discharge ink and that confronts a non-print area of the recording medium adjacent to the print area and whereat printing is not performed during the duration of the printing operation, the second drive pulse signal having one of a voltage value and a pulse width at which the volume of the second ink chamber is varied but does not cause ink to be discharged from the second ink chamber to the confronting non-print area of the recording medium.