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Feed Bowl Alignment Fixture

IP.com Disclosure Number: IPCOM000046669D
Original Publication Date: 1983-Aug-01
Included in the Prior Art Database: 2005-Feb-07
Document File: 3 page(s) / 35K

Publishing Venue

IBM

Related People

Templin, LE: AUTHOR

Abstract

In semiconductor chip-testing operations, the chip must be oriented in a desired orientation prior to being picked up by a vacuum pencil and placed on the electrodes of the test probe. The existing technique for orienting the chip is to place the chips in random orientation in a vibratory feed bowl which has an appropriate combination of orienting projections to orient the chips into the desired orientation and place them at the pickup point. A problem which has occurred in using vibratory feed bowls is that the overall orientation of the pickup point on the vibratory feed bowl will change from time-to-time due to external vibrations, adjustments, cleaning the feed bowl, various product sizes, maintaining the equipment, etc.

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Feed Bowl Alignment Fixture

In semiconductor chip-testing operations, the chip must be oriented in a desired orientation prior to being picked up by a vacuum pencil and placed on the electrodes of the test probe. The existing technique for orienting the chip is to place the chips in random orientation in a vibratory feed bowl which has an appropriate combination of orienting projections to orient the chips into the desired orientation and place them at the pickup point. A problem which has occurred in using vibratory feed bowls is that the overall orientation of the pickup point on the vibratory feed bowl will change from time-to-time due to external vibrations, adjustments, cleaning the feed bowl, various product sizes, maintaining the equipment, etc. The existing technique for reorienting the feed bowl is to manually adjust the feed bowl by a trial and error technique which can be a lengthy and nonreproducible operation. This problem is compounded by the multiplicity of such feed bowls that may have to be used. The problem of nonreproducible manual orientation of the vibratory feed bowls is overcome by the feed bowl alignment fixture which is disclosed in Figs. 1, 2 and 3. Fig. 1 shows a side view of the fixture, and Fig. 2 is an isometric sketch of the fixture. In Fig. 1, the support table 1 has mounted thereon the vibratory base 2 for the feed bowl 3. The position of the feed bowl 3 with respect to the vibratory base 2 can be adjusted by loosening the hex screw 20 at the center 19 of the feed bowl 3 so that the relative position of the bowl 3 with respect to the base 2 can be changed. The chips 21 are aligned in the vibratory feed bowl 3 and progress out to a peripheral pickup location, at which point a vacuum pencil 4 will pick up the chip and then the head of the pickup assembly 5 will rotate the vacuum pencil 4 about the base 6 to the testing contactors for the testing operation. A mounting plate 7 is mounted on the supporting table 1 and serves as a receiving socket for the feed bowl alignment fixture structure 25 shown in Fig. 1. A three-axis linear positioning adjustable slide 8 is replaceably mounted on the plate 7, and has three micrometer adjustments for the mutually orthogonal directions X, Y and Z. By adjusting any one of the positions X, Y and Z, the corresponding entire assembly 25 will be displaced in the desired direction. Mounted on top of the slide 8 is a vertical arm 9 to which is suspended the horizontal arm 10. Mounted on the far end of the horizontal arm 10 is the angularly adjustable stage 11. The angularly adjustable stage 11 has a turret 12 which rotates about the axis 22 when actuated by the micrometer knob 13, so as to carry out an angular displacement R, as desired. Mounted to the underside of the turret 12 is the suspensi...