Thermal print head

Details Thermal print head Thermal print head

1986-06-05

1987-05-26

Evans, Arthur G.

Recorders

Thermal recording

400120, 219543, G01D 1510

Patent

active

046689621

ABSTRACT:
A thermal print head includes electrical heating elements for marking a heat sensitive medium, and buses for delivering power to the elements (each bus being connected in common to a number of the elements); a power source applies to one of the buses a first voltage level which is at least sufficient, when applied to one of the elements, to cause marking, and the power source holds a second bus at a fixed second voltage level insufficient for causing marking. In other aspects, each element in the row is connected between a conductor for supplying power to and a conductor for sinking power from the element, and some of the sink conductors extend on one side of the row while other sink conductors extend on the other side of the row (for making electrical connection to a power sink); there are a number (N) of parallel rows of elements, and there are 2N buses, each bus being connected in common to a plurality of elements, and there is control logic for routing power via each one of the buses in turn; and at least one of the buses is on one side of the rows of elements, and at least another one of the buses is on the opposite side of the rows.

REFERENCES:
patent: 4074109 (1978-02-01), Bakaff et al.
patent: 4423424 (1983-12-01), Takayama
patent: 4435634 (1984-03-01), Horlander
patent: 4450342 (1984-05-01), Goff, Jr. et al.
patent: 4459462 (1984-07-01), Rakes

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