Browse Prior Art Database

Location Slots Isolation Method

IP.com Disclosure Number: IPCOM000043686D
Original Publication Date: 1984-Sep-01
Included in the Prior Art Database: 2005-Feb-05
Document File: 2 page(s) / 49K

Publishing Venue

IBM

Related People

Gredinberg, A: AUTHOR

Abstract

Composite board technology presently uses four symmetrical slots in power planes and location pins for multilayer registration in a laminate. Because the pins must be removed after each lamination cycle, they tend to bend the edges of the slots, which causes shorts between the copper planes. A way of providing electrical isolation of location slots in composite boards is as follows: Use non-symmetrical slots instead of symmetrical ones (Fig. 1). Registration of the ground 11 and voltage 12 sides of the power plane during the drilling operation is shown in Fig. 2. Registration of the drilled copper on the location pins within the non-symmetrical slots during the power lamination step is shown in Fig. 3.

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Location Slots Isolation Method

Composite board technology presently uses four symmetrical slots in power planes and location pins for multilayer registration in a laminate. Because the pins must be removed after each lamination cycle, they tend to bend the edges of the slots, which causes shorts between the copper planes. A way of providing electrical isolation of location slots in composite boards is as follows: Use non- symmetrical slots instead of symmetrical ones (Fig. 1). Registration of the ground 11 and voltage 12 sides of the power plane during the drilling operation is shown in Fig. 2. Registration of the drilled copper on the location pins within the non- symmetrical slots during the power lamination step is shown in Fig. 3. Dissimilar power planes 11 and 12 are registered against alternate sides of the pin 13, isolating successive copper planes on each side of the slot (Fig. 4). Use modified pins to isolate the copper planes against the edges of the slots in the composite board, as shown in (Fig. 5). The "molded" location slot after the power lams lamination cycle is shown in Fig. 6. Using standard pins during the composite lamination cycle provides complete electrical isolation of the location slots in the composite board (Fig. 7).

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