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Vibratory Feeder Bowl Orientation of Transistor Chips

IP.com Disclosure Number: IPCOM000090525D
Original Publication Date: 1969-May-01
Included in the Prior Art Database: 2005-Mar-05
Document File: 3 page(s) / 64K

Publishing Venue

IBM

Related People

Neer, JH: AUTHOR [+2]

Abstract

The vibratory feeder bowl, only a segment of which is shown, orients semiconductor chips having a plurality of contact balls 3 disposed about their peripheries. The contacts are nonsymmetrically disposed with respect to the periphery to establish a clear path, designated by the arrow 0, along one dimension of the chip. The clear path can be located at any position on the chip which adapts it to cooperate with rib member 4 included in one or more tracks of the bowl. The orientation feature includes three like stations 2 along the track. At each station, a misoriented chip is turned 90 degrees in a single line of chips which contain all four orientations of the chip, e.g., 1A, 1B, 1C, and 1D, and yet pass an oriented chip 1A. The chips enter from right to left over rib 4 and peaks 5 and 6.

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Vibratory Feeder Bowl Orientation of Transistor Chips

The vibratory feeder bowl, only a segment of which is shown, orients semiconductor chips having a plurality of contact balls 3 disposed about their peripheries. The contacts are nonsymmetrically disposed with respect to the periphery to establish a clear path, designated by the arrow 0, along one dimension of the chip. The clear path can be located at any position on the chip which adapts it to cooperate with rib member 4 included in one or more tracks of the bowl. The orientation feature includes three like stations 2 along the track. At each station, a misoriented chip is turned 90 degrees in a single line of chips which contain all four orientations of the chip, e.g., 1A, 1B, 1C, and 1D, and yet pass an oriented chip 1A. The chips enter from right to left over rib 4 and peaks 5 and 6. All entering chips are in the balls-down position with contact balls 3 resting against surface 7. This is inclined yet pass an oriented chip 1A. The chips enter from right to left over rib 4 and peaks 5 and 6. All entering chips are in the balls-down position with contact balls 3 resting against surface 7. This is inclined approximately 15 degrees to the horizontal.

As shown in A, chips 1A are in the desired orientation with chip 1D required to be rotated 90 degrees once, chip 1C required to be rotated 90 degrees twice, and with chip 1B required to be oriented 90 degrees three times. Drawing A shows the progress of a properly oriented chip 1A passing through the station. Chip 1A enters the station hooked on member 4 which is slightly lower than the height of balls 3. The width of member 4 is such that only chip 1A remains hooked on it. Chip 1A proceeds into the station and up an incline 8 to peak 6. As the leading edge of chip 1A reaches peak 6, the outside row of balls 3 continues upward along incline 9 to peak 5. The additional height of peak 5 causes the leading edge of chip 1A to hesitate just enough so t...