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Method for a mouse-bite substrate alignment feature

IP.com Disclosure Number: IPCOM000007711D
Publication Date: 2002-Apr-16
Document File: 2 page(s) / 47K

Publishing Venue

The IP.com Prior Art Database

Abstract

Disclosed is a method for a mouse-bite substrate alignment feature. Benefits include improved reliability, ease of manufacturing, and low cost.

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Method for a mouse-bite substrate alignment feature

Disclosed is a method for a mouse-bite substrate alignment feature. Benefits include improved reliability, ease of manufacturing, and low cost.

Background

      A secondary operation is required to cut an alignment feature into a substrate, such as drilling a through hole in a substrate or chamfering a substrate corner, after the substrate has been depanelled. No conventional technique puts an alignment feature into a substrate before depanelling.

Description

      The disclosed method includes the creation of adrill hole in the panel before substrate cingulation (the cutting of the substrates out of the panel). The implementation of the method relies on a highly accurate and reliable substrate panel manufacturing operation. The steps required are as follows:

1.           Select the corner of the substrate to be used for alignment.
2.           Drill the substrates. (This step may put the alignment feature into four substrates if the             trace layouts can be rotated relative to each other. If not, the alignment feature may be            drilled into one substrate.)

3.           Cut the substrates out of the panel (cingulation).

      The resulting quarter-circle cut-out in the substrate can easily be aligned with a mating feature on a socket (see Figure 2).

      The mouse-bite alignment feature can be incorporated into a land-grid array or other socket.

Advantages

              The disclosed method provides advantages over the conventional solution, including:

§         Ease of manufacturing because drilling is...