Browse Prior Art Database

Slot Windows for Circuit Edge Connectors

IP.com Disclosure Number: IPCOM000034529D
Original Publication Date: 1989-Mar-01
Included in the Prior Art Database: 2005-Jan-27
Document File: 2 page(s) / 42K

Publishing Venue

IBM

Related People

Kirk, RD: AUTHOR [+2]

Abstract

A technique is described whereby slot windows are incorporated into circuit card edge connector artwork to provide a means of locating and inspecting critical alignment of keyslots relative to the contact tab locations. Because of the critical alignment requirements, the concept is particularly adaptable to circuit card edge connectors which utilize contact tab centerline spacing of less than 100 mils. Circuit cards, as used in personal systems, typically use extremely narrow centerline tab edge connectors, less than 100 mils, to interface with Micro-Channel* busses. The edge connector generally incorporates a key molded into the connector, to minimize the total contact-to-tab tolerance accumulation.

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Slot Windows for Circuit Edge Connectors

A technique is described whereby slot windows are incorporated into circuit card edge connector artwork to provide a means of locating and inspecting critical alignment of keyslots relative to the contact tab locations. Because of the critical alignment requirements, the concept is particularly adaptable to circuit card edge connectors which utilize contact tab centerline spacing of less than 100 mils. Circuit cards, as used in personal systems, typically use extremely narrow centerline tab edge connectors, less than 100 mils, to interface with Micro-Channel* busses. The edge connector generally incorporates a key molded into the connector, to minimize the total contact-to-tab tolerance accumulation. This key, together with its mating slot in the card tang, provides an accurate means of positioning the contact tabs during card insertion in relationship to the connector contacts. Since the key slot is used as a location guide, its placement is critical. To provide an efficient means of ensuring that the keyslot is properly located, the concept described incorporates a dual window pattern in the circuit edge connector. These dual windows are accurately located, relative to the contact tabs, as they are an integral part of the artwork which locates the contact tabs. The windows enable the keyslot to be properly fabricated and inspected so that critical requirements are met. The dual windows consist of four retangles, as shown in Fig. 1, which can be either etched or deposited on the top and bottom surface planes of the cir...