Clover-leaf solder mask opening

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

1998-10-08

2000-06-20

Gibson, Sharon

Electricity: conductors and insulators

Conduits, cables or conductors

Preformed panel circuit arrangement

174266, 205125, 361767, H05K 100

Patent

active

060780134

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.

REFERENCES:
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patent: 5295299 (1994-03-01), Takahashi
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patent: 5453581 (1995-09-01), Liebman et al.
patent: 5644475 (1997-07-01), Woychik et al.
patent: 5647123 (1997-07-01), Greenwood et al.
patent: 5665525 (1997-09-01), Pienimaa

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