Browse Prior Art Database

Method for a frame carrier opening

IP.com Disclosure Number: IPCOM000009804D
Publication Date: 2002-Sep-19
Document File: 2 page(s) / 61K

Publishing Venue

The IP.com Prior Art Database

Abstract

Disclosed is a method for a frame carrier opening. Benefits include improved performance.

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Method for a frame carrier opening

Disclosed is a method for a frame carrier opening. Benefits include improved performance.

Background

              Conventional frame carrier design does not guarantee the tape is always perfectly aligned with the frame carrier.

              Conventional modules align on frame and tape sprocket holes. If the tape-to-frame carrier placement is misaligned, outputs and ball placement suffers. Tape misalignment occurs with displacement up to 70 microns.

Description

              The disclosed method modifies the frame carrier to have sprocket holes that are not in any way affected by the way the tape is mounted on the frame carrier. The frame carrier has openings that fully expose those sprocket holes.

              The frame carrier used by FSBGA and micro ball-grid array (UBGA) are modified so that the tape sprocket holes are fully exposed. The tape sprocket holes are not affected by tape-to-frame carrier placement errors. These free sprocket holes can be used by modules that are critical to tape-to-frame carrier alignment, such as mold, ball placement, and singulation. The locating pins can use those free sprocket holes for whatever alignment requirements they may have.

Advantages

              The disclosed method provides advantages, including performance due to improved ball placement accuracy.

Fig. 1

Disclosed anonymously