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Browse Prior Art Database

Card Stiffener

IP.com Disclosure Number: IPCOM000050960D
Original Publication Date: 1982-Dec-01
Included in the Prior Art Database: 2005-Feb-10
Document File: 2 page(s) / 41K

Publishing Venue

IBM

Related People

Chrinian, AE: AUTHOR

Abstract

The illustrated apparatus supports printed circuit cards during wave soldering operation, preventing warpage of the card and misapplication of the solder. The positioning of the card and supporting/stiffener apparatus during the soldering operation are illustrated schematically in Fig. 1 and details of the stiffener apparatus are shown in Fig. 2.

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Card Stiffener

The illustrated apparatus supports printed circuit cards during wave soldering operation, preventing warpage of the card and misapplication of the solder. The positioning of the card and supporting/stiffener apparatus during the soldering operation are illustrated schematically in Fig. 1 and details of the stiffener apparatus are shown in Fig. 2.

As shown in Fig. 1, the (7" x 9" x .045") printed circuit card 1 to which solder is to be applied is, structurally reenforced by stiffener member 2. One end of the card terminates in a rigid connector 3 (also called a shroud) for attaching the card to a multi-card assembly. During a wave soldering process the connector end of the card is fastened to a movable drive rail 4 by means of lugs 5, and the other end of the card is supported in or on stationary slide rail 6. The movable rail 4 carries the card in the direction indicated by arrow 7 through a space in which the card is at first preheated and then subjected along its underside to a solder wave for affixing solder to exposed (and properly prepared) conductive portions of the card on the underside surface.

For presently unknown reasons when the card is not reenforced by member 2, heat applied during the preheating step tends to destabilize the card (by softening its predominantly epoxy structure), and this tends to draw the card downward along its long dimension (9"). This may not only permanently distort the card, but it also can affect the uniformity...