Thermal head

Details Thermal head Thermal head

1997-06-26

1999-11-02

Le, N.

Incremental printing of symbolic information

Thermal marking apparatus or processes

Specific resistance recording element type

B41J 2335

Patent

active

059780070

ABSTRACT:
A thermal head, in which the catching of a foreign object on a partial glaze is prevented and the head pressure of the partial glaze is not reduced, is provided such that the image quality is improved by preventing the occurrences of line voids, irregularities, and roughness. In a thermal head which includes a partial glaze, which protrudes and whose cross-sectional configuration is substantially arc-shaped, on a recording material opposing surface, the radius of curvature of a heater portion on the partial glaze is less than 50 mm and the height of the partial glaze from the recording material opposing surface is 40 .mu.m or less. Further, the height of the partial glaze from the recording material opposing surface at the conveying direction upstream side of the recording material may be set lower than the height of the partial glaze from the recording material opposing surface at the conveying direction downstream side of the recording material with the heater portion therebetween.

REFERENCES:
patent: 4707708 (1987-11-01), Kitagishi et al.
patent: 4742362 (1988-05-01), Takoshima et al.
patent: 4840500 (1989-06-01), Sasaki et al.
patent: 5267005 (1993-11-01), Yamamoto

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