Printhead having protection circuit, and printing apparatus...

Details Printhead having protection circuit, and printing apparatus... Printhead having protection circuit, and printing apparatus...

2005-09-20

2005-09-20

Meier, Stephen D. (Department: 2853)

Incremental printing of symbolic information

Ink jet

Controller

C347S012000

Reexamination Certificate

active

06945622

ABSTRACT:
A printhead is provided with a protection circuit protecting the printing element, in order to achieve a high electrostatic tolerance, in particular, an improved tolerance to electric insulation breakdown in an interlayer film. The protection circuit is formed between a signal input pad of the printing element and an inverter connected to a driving circuit. The protection circuit includes two pairs of diodes. A resistance is provided between the two pairs of diodes. Each pair of diodes enables quick dissipation of a high-voltage electrostatic surge, applied to the printhead, to a power supply or base line having a large capacity. A printing apparatus employing the printhead is also provided.

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