Patent ID: 7145584
Filing Date: 2006-12-05
Classification: B41J

Abstract:
1. A printer provided with a thermal head, the thermal head comprising: a substrate; an insulating layer disposed over the substrate and including a projection in a portion of the insulating layer; a plurality of heater elements arrayed on the projection and formed of an exothermic resistor; and independent electrodes and a common electrode for supplying power to the exothermic resistor, wherein at least a portion of a top surface of the substrate is coated with a protective sealing member, the sealing member being disposed closer to a base end of the substrate than the heater elements, wherein, in a state in which the heater elements are in contact with a platen disposed in a main body of the printer, the thermal head is attached to the main body such that the following conditional formulas are satisfied: wherein L denotes a length between a first perpendicular line and a second perpendicular line in the arrayed direction of the heater elements, the first perpendicular line being perpendicular to the top surface of the substrate and extending through a contact point between the heater elements and the platen, the second perpendicular line being perpendicular to the top surface of the substrate and extending through a peak point of the sealing member, wherein H denotes a height from the top surface of the substrate to the peak point of the sealing member, wherein H wherein H wherein θ wherein θ wherein θ wherein θ′ denotes a head-returning angle.