Print head driving circuit

Details Print head driving circuit Print head driving circuit

2007-08-07

2007-08-07

Nguyen, Lams S (Department: 2853)

Incremental printing of symbolic information

Ink jet

Controller

C347S011000, C347S012000

Reexamination Certificate

active

10817963

ABSTRACT:
A print head driving circuit is provided whereby, even if the load changes, the accuracy of the driving voltage waveform supplied to the load can be maintained, and consequently, deterioration in printing quality can be prevented. Transistors Q3, Q4connected in a push-pull configuration are connected to the upstream of a transistor Q1. If the base potential of the transistor Q1rises above its normal level, then the emitter potential of the transistors Q3, Q4will rise and the transistor Q3will become non-conductive, and the transistor Q1will also become non-conductive, but since the transistor Q4is conductive, the current I2will flow from the base terminal of the transistor Q1, to earth, via the transistor Q4, and hence the base potential of the transistor Q1will fall to or below the prescribed value. As a result, it is possible to prevent the base potential of the transistor Q1from rising up in excess of the prescribed value.

REFERENCES:
patent: 6068360 (2000-05-01), Hiwada
patent: 11-20203 (1999-01-01), None

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