Incremental printing of symbolic information – Ink jet – Ejector mechanism
Patent
1992-03-30
1995-03-21
Smith, Matthew S.
Incremental printing of symbolic information
Ink jet
Ejector mechanism
347 40, 347 69, 347 71, B41J 2045
Patent
active
054000645
ABSTRACT:
An ink jet printhead includes of a lower body part having a base section and a plurality of generally parallel spaced projections extending upwardly therefrom and an upper body part having a top section and a corresponding plurality of generally parallel spaced projections extending downwardly therefrom. The top sides of the lower body projections are conductively mounted to the bottom sides of the upper body projections to form sidewalls which define a plurality of ink-carrying channels. Strips of a conductive adhesive mount the lower and upper body projections together and a controller is electrically connected to the strips to selectively impart either a positive, zero, or negative voltage to each strip. The lower body part is formed using a piezoelectric material poled in a first direction generally perpendicular to the channels and the upper body part is formed using a piezoelectric material also poled in the first direction. By applying a positive voltage to a first strip of conductive adhesive and a negative voltage to an adjacent strip of conductive adhesive, first and second electric fields oppositely orientated to each other and normal to the direction of poling are produced in the lower and upper body projections which form first and second sidewalls for the channel, thereby causing the first and second sidewalls to deform in first and second channel expanding directions, respectively.
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Hayes Donald J.
Pies John R.
Wallace David B.
Compaq Computer Corporation
Smith Matthew S.
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