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The method of solder mask diameter measured by using Diamond shape monitoring pattern.

IP.com Disclosure Number: IPCOM000016145D
Original Publication Date: 2002-Nov-30
Included in the Prior Art Database: 2003-Jun-21
Document File: 3 page(s) / 83K

Publishing Venue

IBM

Abstract

Disclosed is to judge a solder resist opening criteria quickly by using a Diamond gauge monitor pattern. The Method of Diamond Monitor Pattern: Figure-A and Figure-B shows the example of Diamond monitor pattern. Provide a solder opening monitor· into the boarder· which is same as function area·.

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  The method of solder mask diameter measured by using Diamond shape monitoring pattern.

Disclosed is to judge a solder resist opening criteria quickly by using a
Diamond gauge monitor pattern.

The Method of Diamond Monitor Pattern:

Figure-A and Figure-B shows the example of Diamond monitor pattern.

Provide a solder opening monitor· into the boarder· which is same as function
area·.

Provide a Diamond monitor patterns(·~·) around the solder opening· .
Then, the corner edge of Diamond pattern is pointing to opposite pattern as ·-
·, ·-·.

Solder Resist Opening size : 120um (Design Data) ·
Opening Criteria (SPEC) : Min.100um··
Monitor size : 50um x 50um·~·
Monitor Pitch :X =100um ·-·,·-··Use for vertical gauge

:Y =100um ·-·,·-· Use for horizontal gauge

The criteria of minimum solder window(minimum gauge) can be defined by 8pcs
of Diamond shapes. ·

Those patterns··are applied four corner of boarder area ··on the sheet··.

Why Diamond shape?

-Make use of the Sharpness corner edge as a measurement Gauge.
-The Aperture of Gerber data is available. ( Not support the triangle, narrow
shapes and etc.)
-Useful for repeatable monitor pattern. (Common usability)

How to inspection:

Examine a minimum guage· with Micro scope if solder opening is inner or outer.

If Solder Opening · is smaller than minimum guage·, which means that solder
opening is under 100um.

Inspection result = Fail

If Solder Opening · is larger than minimum guage·, which means that solder
op...