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Method for an unfolding fixture for flex packages

IP.com Disclosure Number: IPCOM000019520D
Publication Date: 2003-Sep-17
Document File: 6 page(s) / 674K

Publishing Venue

The IP.com Prior Art Database

Abstract

Disclosed is a method for an unfolding fixture for flexible (flex) packages. Benefits include improved functionality, an improved development environment, and improved yield.

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Method for an unfolding fixture for flex packages

Disclosed is a method for an unfolding fixture for flexible (flex) packages. Benefits include improved functionality, an improved development environment, and improved yield.

Background

         A holder is required to safely hold the flex packages while the printed circuit tape is cut off the top of the bottom package. No conventional holder exists.

Description

         The disclosed method is an unfolding fixture for flex packages (see Figure 1). The fixture is used by placing the package on/in the device holder, where it is held by a vacuum and slicing down with a razor blade to remove the upper package or the tape circuit from the lower package (see Figures 2 and 3). The method enables the analysis of the circuit in the lower package.

         A razor blade cuts through the package adhesive that looks similar to silicon rubber (see Figure 4). It is also used with the fixture to remove the top package by slicing through the solder balls. If electrical analysis is required on the top package, balls may be replaced using conventional technology.

         The small size of the package requires viewing the cutting operation through a low-power stereo microscope (see Figure 5). The hole in the blade holder enables viewing of the exact position of the blade during the cut. A great deal of care must be exercised to be sure the cut is true and does not cut the tape. A rubber pad under the device holder helps keep it in place. Four tapped holes for setscrews are loca...