Thermal head and head drive circuit therefor

Details Thermal head and head drive circuit therefor Thermal head and head drive circuit therefor

1996-07-11

1997-12-30

Yan, Ren

Typewriting machines

Typing by other than type-face or type-die

Thermal

347180, B41J 2355

Patent

active

057021880

ABSTRACT:
A thermal head includes a thermal resistance member formed in a straight form, a first lead conductor group having a plurality of first lead conductors which are connected to the thermal resistance member, a second lead conductor group having a plurality of second lead conductors which are connected to the thermal resistance member, the first lead conductors and the second lead conductors being alternately arranged at a given interval, a third lead conductor group connected to the thermal resistance member between the first and second lead conductor groups, and a switch having a first selecting mode for selecting the first lead conductor group and a second selecting mode for selecting the second lead conductor group, wherein when the switch selects the first selecting mode, a region of the thermal resistance member sandwiched by the first lead conductor group and the third lead conductor group is heated, and when the switch selects the second selecting mode, a region of the thermal resistance member sandwiched by the second lead conductor group and the third lead conductor group is heated; and wherein the switch includes a potential applying unit for applying a preselected potential other than 0 to the second lead conductor group during the first selecting mode, and for applying a predetermined potential other than 0 to the first lead conductor group during the second selecting mode.

REFERENCES:
patent: 4360818 (1982-11-01), Moriguchi
patent: 4404567 (1983-09-01), Katsuragi
patent: 4575732 (1986-03-01), Kitaoka
patent: 5066960 (1991-11-01), Deguchi
patent: 5134425 (1992-07-01), Yeung
patent: 5235346 (1993-08-01), Yeung
patent: 5482386 (1996-01-01), Thiel et al.

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