Head driving pulse generation circuit for thermal recording appa

Details Head driving pulse generation circuit for thermal recording appa Head driving pulse generation circuit for thermal recording appa

1990-03-22

1991-11-12

Fuller, Benjamin R.

Recorders

Thermal recording

G01D 1510

Patent

active

050651684

ABSTRACT:
Disclosed herein is a thermal recording apparatus used, in facsimile machines, printers, etc., comprising a thermal head, a driving circuit and a temperature compensation circuit. The head has heating resistors which, driven by the driving circuit, generate heat by which to thermally record images, characters and other information on a recording medium. The temperature compensation circuit, detecting thermal head temperatures, has a charging-discharging circuit whose output charging-discharging signal varies with the temperature detected. The compensation circuit also comprises a reference signal generation circuit and an output circuit, the reference signal generation circuit outputs a reference signal to the output circuit based on information by which to control the head temperature suitably under various internal and external conditions affecting the head temperature inside and apparatus. The output circuit acquires information on actual head temperatures from the charging-discharging signal. The circuit obtains information from the reference signal on the status of the apparatus and any external factors affecting it. Based on these types of information, the output circuit outputs a temperature compensation signal. The driving circuit drives the heating resistors according to the compensation signal.

REFERENCES:
patent: 3577137 (1971-05-01), Brennan, Jr.
patent: 4704617 (1987-11-01), Sato et al.
patent: 4724336 (1988-02-01), Ichikawa

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