Drive circuit for driving an ink jet head

Details Drive circuit for driving an ink jet head Drive circuit for driving an ink jet head

1998-02-02

2000-08-15

Nguyen, Matthew

Electricity: power supply or regulation systems

Self-regulating

Using a three or more terminal semiconductive device as the...

347 14, G05F 316, B41J 2938

Patent

active

061041785

ABSTRACT:
In the drive circuit for driving the ink jet head, the first current mirror circuit (constructed from the transistors Q3, Q6, Q9) and the first regulation circuit (including the variable resistor VR1) are arranged in the charging circuit 31, and the second current mirror circuit (constructed from the transistors Q14, Q16, Q18) and the second regulation circuit (including the variable resistor VR2) are arranged in the discharging circuit 32, thereby the voltage waveform (gradient) at the leading edge of the drive signal applied to the piezoelectric elements 12 in the head parts 30A, 30B is regulated since the current ratio between the current value at the source side and the current value at the output side of the first current mirror circuit is regulated by the first regulation circuit, and the voltage waveform (gradient) at the trailing edge of the drive signal applied to the piezoelectric elements 12 in the head parts 30A, 30B is regulated since the current ratio between the current value at the source side and the current value at the output side of the second current mirror circuit is regulated by the second regulation circuit.

REFERENCES:
patent: 4282535 (1981-08-01), Kern et al.
patent: 5736997 (1998-04-01), Bolash et al.
patent: 5909229 (1999-06-01), Moriguchi et al.

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