Is-enthalpic control of a thermal printing head

Details Is-enthalpic control of a thermal printing head Is-enthalpic control of a thermal printing head

1991-08-05

1993-08-17

Fuller, Benjamin R.

Recorders

Thermal recording

236 493, 374 40, 374 41, 165 40, B41J 2365

Patent

active

052373380

ABSTRACT:
Is-enthalpic temperature control of the operation of the thermal printing head of a thermal printing device is attained by use of a transfer area at the head to transfer heat from the head to a coolant fluid moved by a fluid mover across the transfer area at a flow rate controlled by a circuit on the basis of a sensor that measures the flow rate of electrical energy being fed to the head, and sensors that sense the mass flow rate of the fluid and its rise in temperature upon flow across the transfer area for determining the flow rate of energy being removed from the head. The circuit controls the fluid mover to adjust the fluid flow rate so that the net energy in the head remains substantially constant.

REFERENCES:
patent: 4126269 (1978-11-01), Bruges
patent: 4648551 (1987-03-01), Thompson et al.
patent: 4659290 (1987-04-01), Kundert
patent: 4722669 (1988-02-01), Kundert
patent: 4745413 (1988-05-01), Brownstein et al.
patent: 4773023 (1988-09-01), Giardina
patent: 4797837 (1989-01-01), Brooks
patent: 5095333 (1992-03-01), Shimada
patent: 5102040 (1992-04-01), Harvey

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