Thermal ink jet transducer protection

Details Thermal ink jet transducer protection Thermal ink jet transducer protection

1991-07-09

1993-10-26

Fuller, Benjamin R.

Recorders

Markers and/or driving means therefor

With ink supply to marker

B41J 205

Patent

active

052570428

ABSTRACT:
The present invention provides an ink jet printhead that is provided a bias voltage and that includes at least one ink channel, a heating element, and an interconnect. The ink channel has an open end that serves as a nozzle, and the heating element is positioned in the channel for ejecting ink droplets from the nozzle by selective application of current pulses along the interconnect to the heating element. The printhead further includes a conductive protective region that is positioned adjacent the heating element and that has a portion thereof exposed to the ink channel for protecting the heating element from ink. Positioned between the conductive protective region and the heating element is a dielectric region for insulating the heating element from the conductive protective region. The printhead also includes a bus for connecting the bias voltage to the conductive protective region.

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patent: 4532530 (1985-07-01), Hawkins
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patent: 4774530 (1988-09-01), Hawkins
patent: 4931813 (1990-05-01), Pan et al.
patent: 4935752 (1990-06-01), Hawkins
patent: 4947192 (1990-08-01), Hawkins et al.
patent: 4947193 (1990-08-01), Deshpande
patent: 4951063 (1990-08-01), Hawkins et al.
patent: 4956653 (1990-09-01), Braun

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