Recorders – Markers and/or driving means therefor – With ink supply to marker
Patent
1987-11-02
1988-09-27
Shaw, Clifford C.
Recorders
Markers and/or driving means therefor
With ink supply to marker
346 75, 156147, G01D 1516
Patent
active
047745304
ABSTRACT:
An improved ink jet printhead is disclosed which comprises an upper and a lower substrate that are mated and bonded together with a thick insulative layer sandwiched therebetween. One surface of the upper substrate has etched therein one or more grooves and a recess which, when mated with the lower substrate, will serve as capillary-filled ink channels and ink supplying manifold respectively. The grooves are open at one end and closed at other end. The open ends will serve as the nozzles. The manifold recess is adjacent the groove closed ends. Each channel has a heating element located upstream of the nozzle. The heating elements are selectively addressable by input signals representing digitized data signals to produce ink vapor bubbles. The growth and collapse of the bubbles expel ink droplets from the nozzles and propel them to a recording medium. Recesses patterned in the thick layer expose the heating elements to the ink, thus placing them in a pit, and provide a flow path for the ink from the manifold to the channels by enabling the ink to flow around the closed ends of the channels, thereby eliminating the fabrication steps required to open the groove closed ends to the manifold recess, so that the printed fabrication process is simplified.
REFERENCES:
patent: 4463359 (1984-07-01), Ayata et al.
patent: 4601777 (1986-07-01), Hawkins et al.
patent: 4638337 (1987-01-01), Torpey et al.
patent: 4639748 (1987-01-01), Drake et al.
Chittum Robert A.
Reinhart Mark
Shaw Clifford C.
Xerox Corporation
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