Clover-leaf solder mask opening

Details Clover-leaf solder mask opening Clover-leaf solder mask opening

2000-01-17

2000-11-21

Kelly, Cynthia Harris

Radiation imagery chemistry: process, composition, or product th

Radiation modifying product or process of making

Radiation mask

430320, G03F 900

Patent

active

061500615

ABSTRACT:
A solder mask having a clover-leaf shaped opening around a PTH for enhanced performance. The solder mask resides on a surface of a printed circuit board comprising lands and PTH's. The opening around the PTH is configured to maintain a minimum channel width between the PTH and an adjacent land while maximizing the opening around the PTH, thereby decreasing the likelihood that the solder mask material will be inadvertently drawn into the PTH.

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patent: 5665525 (1997-09-01), Pienimaa
patent: 6004734 (1999-12-01), Berg

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