Thermal printing head

Details Thermal printing head Thermal printing head

1988-08-24

1990-03-06

Reynolds, B. A.

Recorders

Thermal recording

219216, E01D 1510

Patent

active

049070150

ABSTRACT:
A thermal printing head in accordance with the present invention has a substrate formed of an electrical insulator, heating elements formed on the substrate, and conductive layers formed on the part of the heating elements that is adjacent to and on either side of heat generating portions of the heating elements. The resistivity of heating elements is set at a value of not less than 1000 .mu..OMEGA..cm and, simultaneously, the thickness of conductive layers is set at a value of not more than 300 nm. By virtue of this arrangement, it is possible to reduce the distance between the heat generating portions of the head and the printing paper or ink sheet, and the thin conductive layers contribute to minimizing diffusion of the heat. The thermal printing head is therefore capable of efficiently and accurately transferring heat generated by the heat generating portions to the printing paper or ink sheet. The head is suitable for producing half-tone prints and is capable of producing highly gradated prints such as fully-colored prints.

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