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Browse Prior Art Database

Substrate Index and Clamp Assembly

IP.com Disclosure Number: IPCOM000080762D
Original Publication Date: 1974-Feb-01
Included in the Prior Art Database: 2005-Feb-27
Document File: 3 page(s) / 83K

Publishing Venue

IBM

Related People

Scacciaferro, F: AUTHOR [+2]

Abstract

In many instances, it is desirable to place integrated circuit chips on ceramic substrates and fire the chips on the substrate, to achieve solder reflow and connection of the chip to the circuit lines on the substrate. In this connection, it is preferable from an economic standpoint that the solder reflow occur in batch processing, as opposed to serial processing of the substrates.

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Substrate Index and Clamp Assembly

In many instances, it is desirable to place integrated circuit chips on ceramic substrates and fire the chips on the substrate, to achieve solder reflow and connection of the chip to the circuit lines on the substrate. In this connection, it is preferable from an economic standpoint that the solder reflow occur in batch processing, as opposed to serial processing of the substrates.

Referring to Fig. 1, a substrate index and clamp assembly 10 is shown therein. As illustrated, the substrates 11 are serially disposed on racks 12 which are fed into the index and clamp assembly 10 by an indexing conveyer 13. Thereafter, the racks 12 are indexed in the direction of the arrow 14 so when semiconductor chips are deposited upon the substrate, the substrate is in a clamped and predetermined orientation.

The index and clamp assembly 10 includes a yolk shaped indexer 20 having weighted latches 20A and 20B at the extended ends thereof. The latches are designed to engage bars 12A transversely extending with respect to the lower side of the racks 12, and drive the racks step-by-step into a position to be engaged by substrate clamps 30A and 30B. The clamps are mounted upon posts 31A and 31B, respectively, which are moveable, in a manner which will be explained hereinafter, only along the axis of the clamp. To engage the opposite corners of the substrate 11, means, not shown, restrict the motion of the posts to the direction parallel to the axes of the clamp.

The indexer 20 is connected to an index cam or slide 21 having an arcuate camming slot 22 therein, and moveable along a grooved track 23. A clamp cam or slide 24, also moveable along the track 23, has a second arcuate slot 25 therein, the clamp cam or slide 24 being positioned outboard of the index cam
21. An air cylinder 26 has an arm 27 including a crank portion 27A, which extends int...