Methods for dispensing a liquid or viscous material onto a substrate

A method of positioning an applicator of a dispensing system, the applicator configured to dispense a liquid or viscous material onto an electronic substrate, the method comprising:

• determining, using a height sensor, first and second heights, relative to a surface of the electronic substrate, of respective first and second sub-regions of a first plurality of sub-regions of the electronic substrate, the second height being different from the first height;
• determining, using the height sensor, third and fourth heights, relative to the surface of the electronic substrate, of respective third and fourth sub-regions of a second plurality of sub-regions of the electronic substrate, the fourth height being different from the third height;
• generating, using one of the first or second height as a representative height, relative to the surface of the electronic substrate, for the first plurality of sub-regions and one of the third or fourth height as a representative height, relative to the surface of the electronic substrate, for the second plurality of sub-regions, a height map of the electronic substrate indicating the first plurality of sub-regions as having the one of the first or second height and the second plurality of sub-regions as having the one of the third or fourth height;
• prior to dispensing liquid or viscous material to the first and second pluralities of sub-regions of the electronic substrate, determining, based on the height map, a control program for the dispensing system to position the applicator relative to the first and second pluralities of sub-regions of the electronic substrate;
• and
• moving the applicator to dispense the liquid or viscous material onto the first and second pluralities of sub-regions of the electronic substrate.

A method of positioning an applicator of a dispensing system, the applicator configured to dispense a liquid or viscous material to an electronic substrate, the method comprising:

• generating a two-dimensional image of the electronic substrate using a camera communicatively connected to the dispensing system;
• identifying, based on the two-dimensional image of the electronic substrate, a plurality of sub-regions of the electronic substrate, wherein at least one sub-region of the plurality of sub-regions has a different height, relative to a surface of the electronic substrate, than at least one other sub-region of the plurality of sub-regions;
• determining a first height, relative to the surface of the electronic substrate, associated with the plurality of sub-regions;
• generating, based on the two-dimensional image and using the first height as a representative height, relative to the surface of the electronic substrate, for the plurality of sub-regions, a three-dimensional representation of the electronic substrate;
• and
• prior to dispensing liquid or viscous material to the plurality of sub-regions of the electronic substrate, determining, based on the three-dimensional representation, a control program for the dispensing system to position the applicator relative to the plurality of sub-regions of the electronic substrate;
• and
• moving the applicator to dispense the liquid or viscous material onto the plurality of sub-regions of the electronic substrate.