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    3.
    发明专利
    未知

    公开(公告)号：DE69305649D1

    公开(公告)日：1996-11-28

    申请号：DE69305649

    申请日：1993-08-19

    Applicant: COMPAQ COMPUTER CORP

    Inventor： EVERETT MICKEY ,  WALLACE DAVID ,  HAYES DONALD

    IPC: B41J2/045 ,  B41J2/055 ,  B41J2/14 ,  B41J2/155 ,  B41J2/16

    Abstract: A length mode drop on demand type ink jet print head includes a lower body portion formed of an active piezoelectric material and an upper body formed from an inactive material. The lower body portion, which includes a plurality of longitudinally extending projections, is poled in a first direction generally orthogonal to both its longitudinal and vertical axes. The upper body portion also includes a plurality of longitudinally extending projections. The lower and upper body portions are mated such that the lower and upper body projections are spaced interdigitally with each other. By mating the lower and upper body portions in this manner, a plurality of ink-carrying channels are formed. The ink jet print head further includes a controller for selectively applying an electric field across each of the lower body projections in the poling direction. When an electric field is applied across one of the lower body projections in this fashion, the projection imparts a pressure pulse to the ink-carrying channel associated therewith. The active lower body portion may be replaced with an inactive lower body portion, an active intermediate body portion which includes a plurality of longitudinally extending projections, each having a strip of conductive material along the top surface thereof, and a layer of conductive material mounting the lower and intermediate body portions together. Here, the intermediate body portion would be poled in its vertical axis and the electric field would be applied between the conductive strip and layer.

    6.
    发明专利
    未知

    公开(公告)号：DE69205588D1

    公开(公告)日：1995-11-23

    申请号：DE69205588

    申请日：1992-12-18

    Applicant: COMPAQ COMPUTER CORP

    Inventor： HAYES DONALD

    IPC: B23K26/00 ,  B23K26/06 ,  B23K26/067 ,  B23K26/38 ,  B41J2/135 ,  B41J2/16

    Abstract: A method of forming an outwardly tapered orifice for a fully assembled ink jet printhead. A main body portion and a cover plate for an ink jet printhead are mounted together such that the cover plate covers an ink-carrying channel which axially extends through the main body portion. First and second light beams capable of ablating the material used to form the cover plate are generated and an ink-carrying channel communicating orifice extending through the cover plate and tapering outwardly from a front side of the cover plate to a back side of the cover plate is formed by directing the first and second light beams at the front side of the cover plate at first and second angles, respectively, whereby the first and second light beams form the outwardly tapered orifice.

    8.
    发明专利
    未知

    公开(公告)号：DE69305649T2

    公开(公告)日：1997-05-07

    申请号：DE69305649

    申请日：1993-08-19

    Applicant: COMPAQ COMPUTER CORP

    Inventor： EVERETT MICKEY ,  WALLACE DAVID ,  HAYES DONALD

    IPC: B41J2/045 ,  B41J2/055 ,  B41J2/14 ,  B41J2/155 ,  B41J2/16

    Abstract: A length mode drop on demand type ink jet print head includes a lower body portion formed of an active piezoelectric material and an upper body formed from an inactive material. The lower body portion, which includes a plurality of longitudinally extending projections, is poled in a first direction generally orthogonal to both its longitudinal and vertical axes. The upper body portion also includes a plurality of longitudinally extending projections. The lower and upper body portions are mated such that the lower and upper body projections are spaced interdigitally with each other. By mating the lower and upper body portions in this manner, a plurality of ink-carrying channels are formed. The ink jet print head further includes a controller for selectively applying an electric field across each of the lower body projections in the poling direction. When an electric field is applied across one of the lower body projections in this fashion, the projection imparts a pressure pulse to the ink-carrying channel associated therewith. The active lower body portion may be replaced with an inactive lower body portion, an active intermediate body portion which includes a plurality of longitudinally extending projections, each having a strip of conductive material along the top surface thereof, and a layer of conductive material mounting the lower and intermediate body portions together. Here, the intermediate body portion would be poled in its vertical axis and the electric field would be applied between the conductive strip and layer.

    10.
    发明专利
    未知

    公开(公告)号：DE69304050T2

    公开(公告)日：1997-02-20

    申请号：DE69304050

    申请日：1993-05-05

    Applicant: COMPAQ COMPUTER CORP

    Inventor： HAYES DONALD ,  COX W ROYALL

    IPC: B23K26/38 ,  B41J2/16

    Abstract: Method of forming an orifice array for an ink jet printhead. Excimer laser radiation is used to ablate an orifice array in a cover plate having a removable backing, a front side layer formed from either an ablatable inactive material such as polyimide, a non-wettable material doped to absorb excimer radiation, or an ablatable inactive material such as polyimide with a very thin surface layer of a non-wettable material, and an intermediate layer formed from an adhesive material. First, a series of generally square indentations approximately 80 mu m on each side and which extends through the removable backing and the intermediate layer and partially through the front side layer to exposing an interior surface of the front side are formed at spaced locations along the back side surface of the cover plate. Next, a corresponding series of generally circular apertures approximately 40 mu m in diameter, each positioned in the general center of the corresponding indentation and extending through the front side layer are formed in the cover plate.

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