Method and apparatus for driving an ink jet recording head

Details Method and apparatus for driving an ink jet recording head Method and apparatus for driving an ink jet recording head

1994-10-05

1997-05-20

Fuller, Benjamin R.

Incremental printing of symbolic information

Ink jet

Controller

347 68, B41J 2938, B41J 201

Patent

active

056316755

ABSTRACT:
A method and apparatus for driving piezoelectric units of an ink jet recording head to control the ink jet recording head to jet ink droplets having uniform sizes and at uniform jetting velocity, without being influenced by any change in the temperature of the surrounding environment. In one embodiment, two constant current sources are employed provide driving voltages which charge and discharge a capacitor, and the voltage of the capacitor is amplified to provide the voltage for driving the piezoelectric units. In another embodiment, a digital output from a counter, having a clock frequency controlled in accordance with the temperature of the environment, is converted into an analog voltage signal rising or falling in stages. This analog voltage signal is amplified to provide a driving voltage for driving the piezoelectric units.

REFERENCES:
patent: 5426454 (1995-06-01), Hosono et al.

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