Browse Prior Art Database

Method of Forming Bank through a Center Gate

IP.com Disclosure Number: IPCOM000105254D
Original Publication Date: 1993-Jul-01
Included in the Prior Art Database: 2005-Mar-19
Document File: 2 page(s) / 43K

Publishing Venue

IBM

Related People

Wada, T: AUTHOR

Abstract

Disclosed is a method of forming a chip bank (plastic case for IC chips shown as Fig. 1) with center gate injection. Flatness of the chip bank with center gate injection is complete and physically stable when they are stacked up on a handling machine.

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Method of Forming Bank through a Center Gate

      Disclosed is a method of forming a chip bank (plastic case for
IC chips shown as Fig. 1) with center gate injection.  Flatness of
the chip bank with center gate injection is complete and physically
stable when they are stacked up on a handling machine.

      The chip bank 1, as shown in Fig. 1, is used to carry IC chips
through automated handling machines.  In the stacker of handling
machines, flatness of the chip bank is necessary to avoid jamming at
feeding.

      Fig.2 shows the back side of the chip bank 1.  The chip bank 1
has an injection gate 2 on the center of chip bank die which is
adapted with taper shaped runner 3.  The injection gate 2 is placed
vertically against the flat plane of the chip bank surface.  Injected
fluid plastic is equally fed from the gate 2 to the each corner of
chip bank 4.  The injected fluid plastic which includes fillers and
conductive materials spread to the each corner of chip bank 4 with
the same speed and the chip bank is formed.  The center gate
automatically breaks off the connection between the formed chip bank
and tapered runner.  The formed chip bank has same material
distribution with filler in the each corner direction and shows
excellent flatness and stability when the chip banks are stacked.