Method of selectively adjusting surface tension of...

Details Method of selectively adjusting surface tension of... Method of selectively adjusting surface tension of...

2005-05-10

2005-05-10

Trinh, Minh (Department: 3729)

Metal working

Method of mechanical manufacture

Electrical device making

C029S841000, C029S832000, C029S855000, C257S678000, C257S680000, C438S118000, C438S126000

Reexamination Certificate

active

06889430

ABSTRACT:
A method of selectively adjusting surface tension of a soldermask material. Specifically, a method of selectively adjusting the surface tension of a soldermask material to promote adhesion of a molding compound in a ball grid array package while maintaining a low surface tension on the ball attach area to prevent bridging between the solder balls. Solder balls require a low surface tension soldermask to minimize bridging, while the molding compound requires a high surface tension to provide adequate adhesion to the surface of the soldermask. By exposing selected portions of the soldermask to an activation method, such as ultra-violet radiation, the surface tension of the soldermask can be varied such that different areas of the package exhibit different surface tensions.

REFERENCES:
patent: 5389497 (1995-02-01), Yoshioka et al.
patent: 5500315 (1996-03-01), Calvert et al.
patent: 5615477 (1997-04-01), Sweitzer
patent: 5668405 (1997-09-01), Yamashita
patent: 5903041 (1999-05-01), La Fleur et al.
patent: 6048755 (2000-04-01), Jiang et al.
patent: 6137634 (2000-10-01), Li
patent: 6207346 (2001-03-01), Johnson
patent: 6388199 (2002-05-01), Jiang et al.
patent: 6668449 (2003-12-01), Rumsey et al.

Affiliated with

Also associated with

Rating

Method of selectively adjusting surface tension of... does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Method of selectively adjusting surface tension of..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method of selectively adjusting surface tension of... will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-3436697