Thermal ink jet printhead with increased operating temperature a

Details Thermal ink jet printhead with increased operating temperature a Thermal ink jet printhead with increased operating temperature a

1990-01-19

1991-02-19

Reynolds, Bruce A.

Recorders

Markers and/or driving means therefor

With ink supply to marker

B41J 205

Patent

active

049948261

ABSTRACT:
An ink jet printhead for printing ink droplets on a recording medium on demand is disclosed, comprising an upper and lower substrate, each having at least one substantially flat surface. The substrate flat surfaces are mated and bonded together with a thick film layer sandwiched therebetween. The flat surface of the upper substrate contains a set of parallel, closed-end grooves for subseqeunt use as ink flow channels and a separate associated recess for subsequent use as an ink manifold for supplying ink to the saet of channels. The flat surace of the lower substrate having an array of heating elements and addressing electrodes formed thereon. The thick film layer is deposited on the surface of the lower substrate and over the heating elements and addressing electrodes and patterned, prior to the mating of the substrates, to remove predetermined portions of the thick film layer, thus forming an ink flow path in the thick film layer betwaeen the channels and the manifold and currently forming a set of individual, parallel trenches open at one end. The trenches expose each heating element and extend to the edge of the lower substrate to form the open end. After the substrates are mated, the open end of the trenches serve as droplet emitting nozzles and the closed ends serve as a back wall to prevent lateral bubble growth in that direction while the groove closed ends inhibit lateral bubble growth towards the nozzles and concurrently provides additional ink capacity above the heating elements.

REFERENCES:
patent: Re32572 (1988-01-01), Hawkins et al.
patent: 4463359 (1984-07-01), Ayata et al.
patent: 4532530 (1985-07-01), Hawkins
patent: 4638337 (1987-01-01), Torpey et al.
patent: 4774530 (1988-09-01), Hawkins
patent: 4835553 (1989-05-01), Torpey et al.

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