Ink jet head with dummy slots

Details Ink jet head with dummy slots Ink jet head with dummy slots

1991-11-12

1994-10-25

Fuller, Benjamin R.

Incremental printing of symbolic information

Ink jet

Ejector mechanism

347 94, B41J 2045, B41J 2055

Patent

active

053593545

ABSTRACT:
An ink jet head is disclosed for use with a drop-on demand type printer, and includes an insulating base, a plurality of elongated barriers projecting upwardly from the base so as to form a plurality of slots between the barriers, a plurality of nozzle holes communicating with the slots, and electrodes formed on the side walls of the elongated barriers. Voltage can be applied to the various barriers through the electrodes in order to cause deflection of the barriers and a corresponding reduction in the cross-sectional area of selected slots, so as to force ink contained in the slots to be jetted through the nozzle holes. In order to provide a uniform ink jet intensity from the outermost slots relative to the inner slots, dummy slots can be formed outwardly of the outermost active slots by providing dummy barriers outwardly of the outermost active barriers. In addition, the nozzle holes are formed in a nozzle plate. The nozzle plate can either be mounted against the ends of the slots, or atop the base. When mounted atop the base, possible breakage of the ends of the barriers is less of a problem. Further, the plurality of barriers can either be mounted to the base by an adhesive, or can be formed integrally with the base. Also, the ink jet head can be formed with two bases, one atop the other, with the barriers of the bases being polarized in opposite directions.

REFERENCES:
patent: 4390886 (1983-06-01), Sultan
patent: 4550326 (1985-10-01), Allen et al.
patent: 4740800 (1988-04-01), Kyoshima
patent: 4887100 (1989-12-01), Michaelis et al.
patent: 5016028 (1991-05-01), Temple

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