Communications: directive radio wave systems and devices (e.g. – With particular circuit – For frequency modulation
Patent
1993-03-25
1995-06-06
Tran, Huan H.
Communications: directive radio wave systems and devices (e.g.,
With particular circuit
For frequency modulation
B41J 235, B41J 2355
Patent
active
054226627
ABSTRACT:
A thermal printer head comprises an array of heating elements (1-1.about.1-N) mounted on an insulating base member (20). Each of the heating elements is connected to a common voltage source (V) and has a temperature dependent electrical resistance. Electrically resistive elements (2-1.about.2-N) are respectively connected in series with the heating elements to form a plurality of series circuits. Current supply circuits (3-1.about.3-N, 4-1.about.4-N, 5, 6, 7-1.about.7-N, 14) are provided corresponding respectively to the resistive elements for selectively supplying a current to the series circuits in response to a sequence of print signals. A control circuit (8-11, 14) makes a determination whether a voltage developed across each resistive element is higher or lower than a prescribed threshold value and causes one of the current supply ciruits corresponding to the resistive element to control the current depending on the determination.
REFERENCES:
patent: 4330786 (1982-05-01), Hatabe et al.
patent: 4887092 (1989-12-01), Pekruh et al.
patent: 5132709 (1992-07-01), West
Fukushima Itaru
Nakamura Nakaba
Okamoto Takashi
NEC Corporation
Susumu Co., Ltd.
Tran Huan H.
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