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IP.com Disclosure Number: IPCOM000090422D
Original Publication Date: 1969-Apr-01
Included in the Prior Art Database: 2005-Mar-05
Document File: 2 page(s) / 65K

Publishing Venue

IBM

Related People

Ross, T: AUTHOR

Abstract

Vibratory feeder bowls such as shown on pp. 315 and 316 of Vol. 9 of the IBM Technical Disclosure Bulletin include provisions for sorting of semiconductor chips by rejection of them at sense sites during travel of the chips to a pickup point. The rejected chips normally travel unchecked for a substantial distance along track of the feeder prior to processing.

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Quick Return for Vibratory Feeder

Vibratory feeder bowls such as shown on pp. 315 and 316 of Vol. 9 of the IBM Technical Disclosure Bulletin include provisions for sorting of semiconductor chips by rejection of them at sense sites during travel of the chips to a pickup point. The rejected chips normally travel unchecked for a substantial distance along track of the feeder prior to processing.

This arrangement is for returning rejected chips 1, drawing A, to an advanced starting point for intermixing with a normal flow of chips 2 on track 3 of vibratory feeder bowl 4. This arrangement utilizes the sorting ridge 5, drawing B, and shown on pp. 1128 and 1129 of the IBM Technical Disclosure Bulletin, Vol. 10, for sorting of chips such as 1 and 2. These have a plurality of contacts 6 disposed unsymmetrically about their periphery to establish a clear path 7 along one dimension of the chip, typically the length. Chips 2 having a clear path 7 aligned with ridge member 5 are successfully passed as shown in D. Chip 1 without an aligned clear path are raised from track 3 by ridge member 5 and normally fall by gravity, as in C, to the center of vibrator feed bowl 4 for another try.

In this arrangement, rejected chips 1 fall onto a track 8 of an independent vibratory feeder 9 positioned inside the regular bowl 4. The return feeder track 8 is vibrated in the opposite direction to return rejected chips 1 to an advanced starting point.

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