Browse Prior Art Database

Tape Void Filler

IP.com Disclosure Number: IPCOM000037928D
Original Publication Date: 1989-Aug-01
Included in the Prior Art Database: 2005-Jan-31
Document File: 1 page(s) / 12K

Publishing Venue

IBM

Related People

Guttler, JW: AUTHOR [+2]

Abstract

During the TAB (tape automated bonding) manufacturing process, centers of individual frames of tape must be removed for sampling. For instance, after inner lead bonding, centers of frames of tape may be removed to allow inspection and pull testing of the inner lead bonds. The result is that a large hole or void is left in the tape. If the void is allowed to remain in the tape, the tape is seriously weakened and difficulties may be encountered in subsequent manufacturing steps, such as encapsulation, or testing. The tape may not advance properly. It may slide off sprocket wheels and jam tools.

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Tape Void Filler

During the TAB (tape automated bonding) manufacturing process, centers of individual frames of tape must be removed for sampling. For instance, after inner lead bonding, centers of frames of tape may be removed to allow inspection and pull testing of the inner lead bonds. The result is that a large hole or void is left in the tape. If the void is allowed to remain in the tape, the tape is seriously weakened and difficulties may be encountered in subsequent manufacturing steps, such as encapsulation, or testing. The tape may not advance properly. It may slide off sprocket wheels and jam tools.

The defective frame may be spliced out of the tape, but splices also cause problems in tape feed and registration. They can open if the tape is over stressed. Since it is difficult to match the spliced ends precisely, registration from the frame before the splice to the frame after the splice is compromised. There is also the serious problem that if there is a good frame next to the splice it will be ruined by the splicing process.

The solution is to manufacture a "void filler" patch that can be placed over the removed area. The filler may be made of 50 micron thick polyimide, copper, or other suitable material which covers the area of the defective frame. It will have clearances for the sprocket holes and adhesive at the edges for attachment to the remaining tape material at the edges of the frame. The clearance around the sprocket holes makes it possible f...