Thermal print head and method of fabrication

Details Thermal print head and method of fabrication Thermal print head and method of fabrication

1981-05-21

1983-08-16

Rubinson, G. Z.

Electric heating

Heating devices

Combined with diverse-type art device

346 76PH, H05B 100

Patent

active

043993486

ABSTRACT:
A high resolution thermal print head and method of fabrication is provided in which resistive elements are located at the edge of a dielectric support which functions as a spacer and is sandwiched between opposing substrates which carry vertically running electrodes on their inner faces. The electrodes extend to the edge of the spacer where they make electrical contact with opposing sides of the resistive elements. In one embodiment, the resistive elements are recessed into the edge of the spacer to minimize wear. The edge-on contact provided by the print head with the printing paper provides that all the supporting circuitry is orthogonal to the plane of the paper. In one embodiment, the spacer is provided with channels for coolant which is circulated immediately beneath the resistive elements. In another embodiment, the writing surface of the print head is ground down over opposing electrodes to expose the tops of the electrodes and to provide channels at the positions where resistive elements are to be placed, with resistive material deposited in the channels and then ground off to the desired head configuration. Only that portion of a resistive material lying between the exposed opposing electrodes is heated upon the application of power to the electrodes.

REFERENCES:
patent: 3578946 (1971-05-01), Colello
patent: 3950200 (1976-04-01), Muramoto et al.
patent: 4030408 (1977-06-01), Miwa
patent: 4096510 (1978-06-01), Arai et al.

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