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One Pass Expose for Ground Plane Tape Automated Bonding (TAB)

IP.com Disclosure Number: IPCOM000103019D
Original Publication Date: 1990-May-01
Included in the Prior Art Database: 2005-Mar-17
Document File: 1 page(s) / 31K

Publishing Venue

IBM

Related People

Bendz, GA: AUTHOR [+4]

Abstract

Incorporation of the Kapton* etch mask into the circuitry pattern significantly improves the registration of the etched Kapton image to the circuitry image in ground plane tape automated bonding packaging. This improved registration is accomplished by exposing the signal and ground plane images simultaneously in accordance with typical semi-additive plating of circuitry. Thus, eliminating the need to reregister a separate resist system to define the Kapton. The ground plane circuitry subsequently acts as the Kapton etch mask when the Kapton is etched. The signal plane is covered with a blanket exposed solvent resist to protect the signal plane circuitry from the aggressive alkaline etchant used to pattern the Kapton.

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This is the abbreviated version, containing approximately 100% of the total text.

One Pass Expose for Ground Plane Tape Automated Bonding (TAB)

      Incorporation of the Kapton* etch mask into the circuitry
pattern significantly improves the registration of the etched Kapton
image to the circuitry image in ground plane tape automated bonding
packaging.  This improved registration is accomplished by exposing
the signal and ground plane images simultaneously in accordance with
typical semi-additive plating of circuitry.  Thus, eliminating the
need to reregister a separate resist system to define the Kapton.
The ground plane circuitry subsequently acts as the Kapton etch mask
when the Kapton is etched.  The signal plane is covered with a
blanket exposed solvent resist to protect the signal plane circuitry
from the aggressive alkaline etchant used to pattern the Kapton. The
resultant package possesses superior registration of the Kapton to
circuitry images providing increased design and tolerance
flexibility.
*Kapton is a registered trademark of E.I. Dupont de Nemours & Co.,
Inc.

      Disclosed anonymously.