Apparatus for driving liquid jet head

Details Apparatus for driving liquid jet head Apparatus for driving liquid jet head

1984-06-04

1987-01-27

Goldberg, E. A.

Recorders

Performance of multiple functions of steam and gas engines

Pressure responsive element

346140R, 310317, 310326, G01D 1516

Patent

active

046397353

ABSTRACT:
An apparatus for driving a liquid jet head comprises: a piezoelectric element which mechanically deforms responsive to an electric signal; a pressure chamber whose volume varies due to the deformation of such element; a discharge port communicated with such chamber; 1st and 2nd charging circuits to charge such element at the same polarity; a discharging circuit to discharge such element; and a control unit for making the 1st charging circuit operative prior to the operation of the 2nd charging circuit. A charge time constant of the 1st charging circuit is set to be sufficiently long that no droplet is emitted. A charge time constant of the 2nd charging circuit is set to be shorter to emit a droplet from the discharge port. The surface tension of the meniscus and the contractive force due to the contraction of the pressure chamber act multiplicatively, so that it is possible to record a droplet of a small dot diameter.

REFERENCES:
patent: 4161670 (1979-07-01), Kern
patent: 4393384 (1983-07-01), Kyser
patent: 4471363 (1984-09-01), Hanaoka

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