Patent ID: 6686945
Filing Date: 2004-02-03
Classification: B41J

Abstract:
A thermal head unit comprising: a thermal head having a head chip, a plurality of heating elements disposed on an upper surface of the head chip at an end portion thereof, a plurality of electrodes disposed on the upper surface of the head chip and connected to the heating elements, a wiring substrate disposed on a lower surface of the head chip so that the end portion of the head chip protrudes from the wiring substrate, and a semiconductor integrated circuit mounted on the wiring substrate; a support member for supporting the thermal head, the support member having an upper step portion connected to the end portion of the head chip and a step difference portion; an adhesive agent layer disposed in a clearance formed between the step difference portion and the wiring substrate; and an adhesive layer for adhering the end portion of the head chip to the upper step portion of the support member, the adhesive agent layer being softer than the adhesive layer after the end portion of the head chip is adhered to the upper step portion of the support member and before the adhesive agent layer is hardened.