Circuit for driving ink-jet head

Details Circuit for driving ink-jet head Circuit for driving ink-jet head

1997-07-24

2000-04-04

Barlow, John

Incremental printing of symbolic information

Ink jet

Controller

347 71, B41J 2045

Patent

active

060452099

ABSTRACT:
A drive voltage is applied to an actuator between adjacent ink-jet channels so that the actuator is deformed to jet ink from one of the adjacent channels. Then, a drive voltage for jetting ink from the other channel is applied to the actuator so as to partially overlap the drive voltage for deforming the actuator, and thereby the actuator returns to its original state. A first protection diode D1 and a second protection diode D2 for protecting transistors from a reverse bias voltage are connected respectively in parallel with a first transistor Q1 and a second transistor Q2, which constitute a driving circuit for the actuator. The average rectified current I.sub.0 used in the maximum rating of the protection diodes D1 and D2 satisfies I.sub.0 .gtoreq.2.times.E.times.C'.times.f (amps), and the peak current I.sub.FM used in the maximum rating satisfies I.sub.FM .gtoreq.2.times.(E-E.sub.F)/(2.times.R+R.sub.ON) (amps).

REFERENCES:
patent: 5227813 (1993-07-01), Pies et al.
patent: 5422664 (1995-06-01), Stephany
patent: 5552809 (1996-09-01), Hosono et al.
patent: 5557304 (1996-09-01), Stortz
patent: 5818483 (1998-10-01), Mizutani

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