Patent ID: 11926156
Assignee: ROHM CO., LTD.
Field: Textile and paper machines (Mechanical engineering)
Classification: CPC B | IPC B

Claim 17:
18. A method of fabricating a thermal print head, comprising:
forming a mask layer on a first surface and a second surface of a substrate made of a semiconductor material, wherein the first surface and the second surface face opposite sides of each other in a thickness direction;
forming a main surface and a convex portion on the substrate by an anisotropic etching, wherein the main surface faces same direction as the first surface in the thickness direction and located between the first surface and the second surface, and the convex portion protrudes from the main surface;
removing the mask layer;
forming a resistor layer including a plurality of heat generating portions arranged in a main scanning direction and on the convex portion; and
forming a wiring layer conducting the plurality of heat generating portions and in contact with the resistor layer, wherein
the mask layer includes a first mask layer formed on the first surface and a second mask layer formed on the second surface,
the first mask layer includes:
a covering portion, extending in the main scanning direction and covering the first surface;
two first openings, located in the sub-scanning direction with the covering portion disposed in between, and extending in the main scanning direction; and
a second opening, located next to an end of the covering portion in the main scanning direction, and connected to the two first openings, and wherein
the first surface is exposed from the two first openings and the second opening.