Thermal recording apparatus with a thermal head including energi

Details Thermal recording apparatus with a thermal head including energi Thermal recording apparatus with a thermal head including energi

1993-06-04

1997-01-14

Tran, Huan H.

Incremental printing of symbolic information

Thermal marking apparatus or processes

Having driving circuitry for recording means

B41J 235

Patent

active

055944892

ABSTRACT:
A thermal recording apparatus includes a thermal head. Printing for multi-tone density is performed by changing an energizing time of the thermal head. The apparatus has a controller for controlling the energizing time and an interrupting circuit. The controller controls the energizing time to match to a value corresponding to a tone density for printing. The interrupting circuit puts an interrupt period of energizing for the energizing time if the energizing time is equal to or more than a predetermined time. A plurality of different counters is provided for increasing the interrupt period in duration stepwisely.

REFERENCES:
patent: 4047228 (1977-09-01), Yagishita et al.
patent: 4633269 (1986-12-01), Mikami et al.
patent: 4675695 (1987-06-01), Samuel
patent: 4984092 (1991-01-01), Kato et al.
patent: 5142302 (1992-08-01), Kano

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