HEAD DEVICE PROVIDED WITH DRIVE ICS, TO WHICH PROTECTIVE COATING IS APPLIED, AND METHOD OF FORMING PROTECTIVE COATING

摘要

A head device (10), in particular, a thermal print head, comprises an insulating substrate (11) having a first longitudinal edge portion (11a) and a second longitudinal edge portion (11b) opposite to the first longitudinal edge portion (11a), a work element (12) provided near the first longitudinal edge portion (11a) on the substrate, a plurality of drive ICs (13) formed in a array along the second longitudinal edge portion (11b) on the substrate for driving the work element (12), and a protective coating (17) of resin formed to cover the drive ICs (13) and having a terminal projection (17a) which is formed when the coating is formed. The terminal projection (17a) projects toward the second longitudinal edge portion (11b) on the substrate (11) and is disposed between adjacent two drive ICs (13). <IMAGE>