×

Acoustic ink printhead with integrated liquid level control layer

  • US 5,121,141 A
  • Filed: 01/14/1991
  • Issued: 06/09/1992
  • Est. Priority Date: 01/14/1991
  • Status: Expired due to Term
First Claim
Patent Images

1. An integrated acoustic ink printhead with liquid level control comprisinga substrate having an array of ejectors, each ejector having a concave substrate surface area with a radius of curvature capable of radiating a free surface of ink with focused acoustic radiation to eject individual droplets of ink on demand, said ejectors having approximately equal acoustic focal lengths;

  • anda spacer layer with a first surface in intimate contact with said substrate and a second surface opposite said first surface, said spacer layer having a predetermined thickness approximately equal to a difference between said ejectro acoustic focal length and said ejector radius of curvature, said spacer layer also having a set of apertures through said spacer layer, each aperture aligned with one of said ejectors substrate surface area;

    whereby said set of apertures in said spacer layer form a control for the level of said free ink surface above each ejector substrate surface.

View all claims
  • 4 Assignments
Timeline View
Assignment View
    ×
    ×