| 摘要 |
An improved protective construction for a bubble jet print head device of the kind having a substrate with a plurality of separately addressable resistive heater portions that are formed by address and common electrodes. The protective construction includes a first layer of dielectric material formed over the heater portions, a second layer of metal formed over the first layer, and a third layer having a physically hard and chemically inert outer surface portion overlying the second layer.
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