Digital printing plate and system with electrostatically latched deformable membranes
View Patent ↗A printing surface includes a substrate having latching electrodes on a first surface, a spacer layer on the first surface of the substrate, the spacer layer patterned to form wells such that the latching electrodes reside in the wells, a deformable membrane, the membrane having conductive regions, on the spacer layer to enclose the wells, each enclosed well and its associated region of the membrane forming a pixel membrane, and actuation circuitry to actuate the electrodes to cause selected ones of the pixel membranes to remain in a deflected state when the pixel membranes receive an impulse to return to an undeflected state.
1. A method of printing, comprising:
moving an array of pixel membranes on a printing surface to a deflected position;
causing selected ones of the pixel membranes to hold the deflected position while moving others of the pixel membranes to an undeflected position; and
applying ink to the printing surface;
moving the selected ones of the pixel membranes in the deflected position to an undeflected state forming an undeflected printing surface; and
applying the undeflected printing surface to a printing substrate.
2. The method of claim 1 , comprising removing excess ink from the printing surface such that ink remains in deflected portions of the printing surface corresponding to the selected ones of the pixel membranes in the deflected positions.
3. The method of claim 1 , wherein moving the pixel membranes comprises applying one of applying an external mechanical force or an external magnetic field.
4. The method of claim 3 , wherein the external mechanical force comprises one of fluid pressure, gas pressure, fluid pressure from the ink during the inking, or mechanical contact with a solid material.
5. The method of claim 3 , wherein the external magnetic field comprises a magnetic force generated on a magnetic part located in one of in the membrane or on the membrane surface.
6. The method of claim 1 , wherein causing selected ones comprises electrostatically latching the selected ones into the deflected position, and moving others comprises one of applying a positive pressure to the wells to move the others not electrostatically latched, allowing elastic force in the membranes to restore the others not electrostatically latched; or applying a magnetic field to a top of the membrane.
7. The method of claim 1 , wherein applying ink to the printing surface comprises one of either applying ink into the selected ones of the pixel membranes holding the deflected position or applying ink to undeflected surfaces of the other pixel membranes.