Method of manufacturing an integrated orifice plate and electroformed charge plate
An integrated orifice array plate and a charge plate is fabricated for a continuous ink jet print head by providing an electrically non-conductive orifice plate substrate having first and second opposed sides and an array of predetermined spaced-apart orifice positions. A plating seed layer is applied to the first of the opposed sides of the substrate, and an array of orifices is formed through the orifice plate substrate at the predetermined orifice positions. The orifices extend between the opposed sides. The plating seed layer is etched, leaving a portion of the plating seed layer adjacent to each of the predetermined orifice positions. A charge electrode is plated onto each of the portions of the plating seed layer.
1. A method for integrally fabricating a combined orifice array plate and charge plate for a continuous ink jet printer print head, said method comprising the steps of:
providing an electrically non-conductive orifice plate substrate having first and second opposed sides, said orifice plate substrate having an array of predetermined spaced-apart orifice positions;
applying a plating seed layer to said first side of the substrate;
forming an array of orifices through the orifice plate substrate at the predetermined orifice positions, said orifices extending between said first and second opposed sides;
etching the plating seed layer, leaving a portion of the plating seed layer adjacent to each of the predetermined orifice positions; and
plating a charge electrode on each of the portions of the plating seed layer.
2. The method for integrally fabricating a combined orifice array plate and charge plate as set forth in claim 1 , wherein:
the first and second opposed sides of the orifice plate substrate are initially coated with a silicon nitride layer; and
the orifices are formed by etching into the orifice plate substrate through openings in the silicon nitride layer on the first side.
3. The method for integrally fabricating a combined orifice array plate and charge plate as set forth in claim 1 , wherein:
the first and second opposed sides of the orifice plate substrate are initially coated with a silicon nitride layer; and
the orifices are formed in a trench by etching into the orifice plate substrate through openings in the silicon nitride layer on the first side.
4. The method for integrally fabricating a combined orifice array plate and charge plate as set forth in claim 1 wherein the step of applying a plating seed layer to said first opposed side of the orifice plate substrate is effected by sputtering.
5. The method for integrally fabricating a combined orifice array plate and charge plate as set forth in claim 1 wherein the charge electrodes alternate from one side of the orifice array to the other.
6. The method for integrally fabricating a combined orifice array plate and charge plate as set forth in claim 1 wherein the step of forming the array of charge electrodes is effected by electroplating.
7. The method for integrally fabricating a combined orifice array plate and charge plate as set forth in claim 1 wherein step of etching the plating seed layer is effected by wet etching.
8. A method for integrally fabricating a combined orifice array plate and charge plate for a continuous ink jet printer print head, said method comprising the steps of:
providing an electrically non-conductive orifice plate substrate having first and second opposed sides, said orifice plate substrate having an array of predetermined spaced-apart orifice positions;
applying a plating seed layer to said first side of the orifice plate substrate;
forming an array of orifices through the orifice plate substrate at the predetermined orifice positions, said orifices extending between said first and second opposed sides;
etching the plating seed layer, leaving a portion of the plating seed layer adjacent to each of the predetermined orifice positions;
plating a charge electrode on each of the portions of the plating seed layer; and
forming an ink channel on said second opposed side of the orifice plate substrate.
9. The method for integrally fabricating a combined orifice array plate and charge plate as set forth in claim 8 , wherein the ink channel is formed by:
coating said second opposed side of the orifice plate substrate with a silicon nitride layer; and
etching into the orifice plate substrate through an opening in the silicon nitride layer on the second side of the orifice plate substrate.
10. The method for integrally fabricating a combined orifice array plate and charge plate as set forth in claim 8 , wherein etching into the orifice plate substrate to form the ink channel is effected by deep reactive ion etching.