Edge coating apparatus with movable roller applicator for solar cell substrates
View Patent ↗A non-contact edge coating apparatus includes an applicator for applying a coating material on an edge of a solar cell substrate and a control system configured to drive the applicator. The control system may drive the applicator along an axis to maintain a distance with an edge of the substrate as the substrate is rotated to have the edge coated with a coating material. The applicator may include a recessed portion into which the edge of the substrate is received for edge coating. For example, the applicator may be a roller with a groove. Coating material may be introduced into the groove for application onto the edge of the substrate. A variety of coating materials may be employed with the apparatus including hot melt ink and UV curable plating resist.
1. An edge coating apparatus for a solar cell substrate, the apparatus comprising:
a first transport comprising:
a cam; and
a single-substrate support adapted to receive a non-circular solar cell having a center point, top and bottom surfaces, and a perimeter edge, the single-substrate support further adapted to rotate the non-circular solar cell about the center point;
a roller applicator comprising a roller member, the roller applicator adapted to rotate the roller member around a central roller axis and to dispense a coating material from the roller member; and
an alignment assembly comprising:
slider assembly; and
a follower that is concentric with the roller member, the slider assembly engaged to push the follower to contact the cam, the follower supporting the roller member and adapted to move the roller member along a following axis in accordance with the interface between the follower and the cam, the following axis extending between the center of the non-circular solar cell and the central roller axis, the slider assembly further adapted to adjust the position of the roller member along the following axis to maintain a fixed distance between the roller member and the perimeter edge of the non-circular solar cell such that the roller member does not contact the perimeter edge of the non-circular solar cell.
2. The apparatus claim 1 , wherein the coating material comprises hot melt ink.
3. The apparatus of claim 1 , wherein the coating material comprises ultraviolet (UV) curable plating resist.
4. The apparatus of claim 3 , further comprising a UV-light emitter adapted to direct UV light to the edge of the non-circular solar cell while the substrate is on the single-substrate support.
5. The apparatus of claim 1 , wherein the single-substrate support comprises a chuck adapted to hold the non-circular solar cell by vacuum force.
6. The apparatus of claim 1 , wherein the roller member comprises a roller having a groove adapted to receive the edge of the substrate to apply the coating material thereon.
7. The apparatus of claim 1 , further comprising a second transport adapted to move the non-circular solar cell from a first station where the roller applicator applies the coating material to the edge of the non-circular solar cell and a second station.
8. The apparatus of claim 7 , wherein the transport comprises a pick and place robot.
9. An edge coating apparatus for a solar cell substrate, the apparatus comprising:
a transport comprising:
a cam; and
a single-substrate support adapted to receive a non-circular solar cell with a center point and further adapted to rotate the non-circular solar cell about the center point;
a roller applicator comprising a roller member, the roller applicator adapted to rotate the roller member around a central roller axis and to dispense a coating material from a recessed portion in the roller member adapted to receive a top, bottom and side edge of the non-circular solar cell; and
an alignment assembly comprising:
a slider assembly; and
a follower that is concentric with the roller member, the slider assembly engaged to push the follower to contact the cam, the follower supporting the roller applicator and adapted to move the roller applicator along a following axis to allow for the application of the coating material to the top, bottom and side edge of the solar cell substrate, the recessed portion in the roller member maintaining a fixed distance between the roller member and the perimeter edge without the roller applicator contacting the edge of the solar cell substrate in accordance with the interface between the follower and the cam.
10. The apparatus of claim 9 wherein the coating material comprises hot melt ink.
11. The apparatus of claim 9 wherein the coating material comprises ultraviolet (UV) curable plating resist.
12. The apparatus of claim 9 further comprising a single-substrate support configured to hold the non-circular solar cell by vacuum force while the non-circular solar cell is rotated to have the coating material applied on the edge of the non-circular solar cell.
13. The apparatus of claim 9 further comprising a transport configured to transfer the non-circular solar cell between the first position where the edge of the non-circular solar cell is coated with the coating material and a second position configured to pre-align the non-circular solar cell for pick-up by the transport.
14. The apparatus of claim 9 wherein the transport comprises a multi-axis robot.