Patent ID: 7142228
Filing Date: 2006-11-28
Classification: B41J,H01L

Abstract:
1. A thermal head comprising: a head substrate comprising a plurality of exothermic bodies arranged at a predetermined interval, a common electrode connected to the entire plurality of exothermic bodies, and a plurality of individual electrodes individually connected to the plurality of exothermic bodies; and a driving IC substrate comprising a plurality of driving ICs individually controlling electrification/non-electrification of the plurality of individual electrodes and a plurality of IC electrode pads arranged substantially in parallel with the arranging direction of the exothermic bodies at a pitch smaller than the arranging interval of the exothermic bodies and respectively connected to the plurality of driving ICs, so that the plurality of individual electrodes and the plurality of IC electrode pads are bonded together with connection wire, wherein the connection wire is at most 23 μm in diameter and includes a connection portion with a width larger than the wire diameter and connected to the individual electrodes or the IC electrode pads and an upstanding portion raised from the connection portion at a predetermined angle in a state floated from the individual electrodes or the IC electrode pads, and wherein the pitch of the IC electrode pads is at most 60 μm; the surface area of the connection portion of the connection wire is not less than 0.0015 mm