Thermal head and thermal printer provided with same

摘要

A thermal head which is capable of reducing heat concentration on heat generation portions, and a thermal printer provided with the thermal head are provided. A thermal head includes a substrate; a plurality of heat generation portions which are disposed aligned on the substrate; electrodes which are electrically connected to the heat generation portions; and a protection layer which coats the heat generation portions and a part of the respective electrodes. The protection layer includes a first protection layer which is disposed on the heat generation portions and a second protection layer which is disposed on the first protection layer and has a higher thermal conductivity than that of the first protection layer. A width of the second protection layer is larger than that of the first protection layer when seen in an arrangement direction of the heat generation portions.

主权项

1. A thermal head, comprising:
a substrate; a plurality of heat generation portions which are disposed aligned on the substrate; electrodes which are electrically connected to the heat generation portions; and a protection layer which coats the heat generation portions and a part of the respective electrodes, the protection layer including:
a first protection layer which is disposed on the heat generation portions; anda second protection layer which is disposed on the first protection layer and has a higher thermal conductivity than that of the first protection layer, wherein a width of the second protection layer is larger than that of the first protection layer when seen in an arrangement direction of the heat generation portions, the first protection layer is in contact with the electrodes, and the second protection layer is in contact with the electrodes, and lengths of interfaces between the second protection layer and the electrodes are larger than lengths of interfaces between the first protection layer and the electrodes when seen in a cross-sectional view of the thermal head.