Patent ID: 7372477
Filing Date: 2008-05-13
Classification: B41J

Abstract:
1. A thermal head comprising: a resistor layer generating heat when electricity is supplied thereto; an insulating barrier layer covering the surface of the resistor layer so as to determine a planar size of a heat generating area; and an electrode layer which is overlaid on the insulating barrier layer and which supplies electricity to the resistor layer, wherein the resistor layer and the insulating barrier layer each have a planar U shape, the resistor layer is present only under the insulating barrier layer and includes a pair of effective heating portions each having a predetermined length dimension and a predetermined width dimension and a connection portion connecting the pair of effective heating portions at an end thereof, and the electrode layer includes a separate electrode and a common electrode, which are connected to said pair of effective heating portions at one end side of the resistor layer in the longitudinal direction, and also includes a folded electrode connected to said pair of effective heating portions and the connection portion at the other end side of the resistor layer in the longitudinal direction.