Patent ID: 11910537
Assignee: WUHAN DR LASER TECHNOLOGY CORP, . LTD
Field: Audio-visual technology (Electrical engineering)
Classification: CPC H  B | IPC B  H

Claim 16:
17. A pattern transfer printing (PTP) method comprising:
handling a tape comprising, as sections thereof, a plurality of pattern transfer sheets having respective patterns of trenches, to controllably deliver the pattern transfer sheets for paste filling and consecutively for pattern transfer,
filling the trenches on the delivered pattern transfer sheets with conductive printing paste,
controllably delivering the plurality of wafers for the pattern transfer, and
transferring the conductive printing paste from the pattern transfer sheets onto the delivered wafers, by releasing the printing paste from the trenches upon illumination by a laser beam,
wherein the handling of the tape comprises moving the tape from an unwinder roll to a re-winding roll in a step-and-repeat mode
wherein the method further comprises at least one of:
monitoring positions and distortions of the trenches prior to the pattern transfer using multiple imaging cameras configured to capture ends of the trenches and at least two tilted imaging cameras configured to capture at least middle-sections of the trenches, wherein the tilt is with respect to a vertical direction and is configured to capture the middle-sections of the trenches; and/or
detecting and measuring features on the wafer and adjusting accordingly the transferring of the conductive printing paste from the pattern transfer sheets onto the delivered wafers, using multiple imaging cameras configured to capture at least a part of a perimeter of the wafer, the cameras configured to image the wafer corners and features at a middle of the wafer.