Adhesive joint with an ink trap and method
AssigneeHewlett-Packard Development Company, L.P.
InventorsCharles G. Schmidt, Joseph R. Elliot, James E. Clark
Life of this patent
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Abstract
An adhesive joint with an ink trap is provided. The joint may be employed in a cartridge for an inkjet printer. The cartridge includes a headland region attached to a printhead assembly by an adhesive layer. The adhesive joint between the headland region and the printhead assembly include notches for retaining additional adhesive in order to reduce degradation of adhesive due to ink penetration. A method of assembling the printer cartridge to include an ink trap in the adhesive joint is also provided.
Claims27
An adhesive joint having an improved resistance to degradation resulting from chemical penetration, comprising an adhesive layer located between two opposing surfaces to thereby join the two surfaces wherein the adhesive layer includes an chemical trap diluting the concentration of the chemical in the adhesive.
A print cartridge for an inkjet printer comprising:
- a printhead assembly including a substrate and a flexible circuit;
- a headland portion connected to the printhead assembly by an adhesive;
- wherein the headland portion includes an ink trap for retaining adhesive to thereby reduce the concentration of diffused ink in the adhesive.
A printer cartridge for an inkjet printer comprising:
- a flexible circuit having a plurality of ink orifices and electrical leads;
- a substrate containing a plurality of heating elements and associated ink vaporization chambers, the substrate having electrodes to which the electrical leads are bonded, the substrate mounted on a back surface of the flexible circuit, each heating element being located proximate to an associated ink orifice, the back surface of the flexible circuit extending over two or more outer edges of the substrate;
- a headland portion located proximate to the back surface of the flexible circuit and including an inner raised wall circumscribing the substrate, the inner raised wall having wall openings therein, the wall openings having a support surface for supporting the substrate;
- an adhesive layer positioned between the back surface of the flexible circuit and the headland portion to affix the flexible circuit to the headland portion, the adhesive layer located on the inner raised wall and on the substrate support surface;
- and
- an ink trap located in the adhesive layer to reduce the concentration of the ink in the adhesive layer.
An adhesive joint between a headland portion of an inkjet printer cartridge and a printhead assembly comprising an ink trap to reduce the ink concentration in the joint.
A method of assembling an inkjet printer cartridge comprising the steps of:
- (a) providing a printhead assembly including a substrate and a circuit;
- (b) providing a headland portion of the printer cartridge, wherein the headland portion includes a support surface to be bonded to the printhead assembly;
- (c) providing a notch in the support surface;
- (d) bonding the printhead assembly to the support surface using an adhesive, wherein a portion of the adhesive is located in the notch so that the concentration of the ink that subsequently diffuses into the adhesive is diluted by the portion of the adhesive located in the notch.
A method of forming an ink trap in an adhesive joint in an inkjet printer cartridge comprising the steps of:
- (a) providing a printhead assembly and a headland portion of the printer cartridge, wherein the headland portion includes a support surface having a notch;
- (b) forming an adhesive joint by bonding the printhead assembly to the support surface using an adhesive, wherein a portion of the adhesive is located in the notch, thereby forming an ink trap in the joint for diluting the concentration of the ink that diffuses into the adhesive.
Dependencies are inferred from the claim text.