Ink jet printing head and method for driving the same

Details Ink jet printing head and method for driving the same Ink jet printing head and method for driving the same

1995-12-21

2000-11-21

Barlow, John

Incremental printing of symbolic information

Ink jet

Controller

347 70, B41J 201

Patent

active

061492582

ABSTRACT:
An ink jet printing head includes a plurality of pressure chambers having a natural period T2 for propagation of a wave, and a plurality of piezoelectric elements having a natural period T1 for oscillation. T1 and T2 are selected such that T1=n.multidot.T2 or T2=n.multidot.T1 wherein n is a natural number. The driving voltage for the piezoelectric elements has a rise time T3 selected at T3=m.multidot.T2 wherein m is a natural number not lower than two if T1=2.multidot.T2, or selected at T3=m.multidot.T2 wherein m is a natural number if T2=n.multidot.T1. The rise time T3 may be selected at T3=n.multidot.T1 in the latter case. Both the rise time T3 and the voltage level V of the driving voltage are selected in a single printing head so that V/T3 is a constant for attaining a gray scale level printing. The rise time T3 thus selected provides stable ink droplets without satellite ink droplets degrading the printing quality.

REFERENCES:
patent: 4730197 (1988-03-01), Raman et al.
patent: 5495270 (1996-02-01), Barr et al.

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