Method for fabricating stacks of IC chips by segmenting a larger stack
First Claim
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1. A method for forming a stack containing IC chips for use as a dense electronic package having an access plane surface, which method comprises:
- forming a large stack containing a large number of IC chips, each of which chips includes both integrated circuitry and a multiplicity of electrical leads extending from such circuitry to the same edge of the chip;
performing processing steps on the large stack to prepare the chip leads for connection to elements in an electronic system; and
separating the large stack into a plurality of small stacks, each of which constitutes a module for use in an electronic system.
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Abstract
A method for fabricating stacks of IC chips into modules providing high density electronics. A relatively large number of layers are stacked, and then integrated by curing adhesive applied between adjacent layers. A large stack is formed, various processing steps are performed on the access plane face of the large stack, and then the large stack is segmented to form a plurality of smaller, or short, stacks. Means are provided for causing separation of the larger stack into smaller stacks, without disturbing the adhesive which binds the layers within each small stack.
83 Citations
24 Claims
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1. A method for forming a stack containing IC chips for use as a dense electronic package having an access plane surface, which method comprises:
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forming a large stack containing a large number of IC chips, each of which chips includes both integrated circuitry and a multiplicity of electrical leads extending from such circuitry to the same edge of the chip; performing processing steps on the large stack to prepare the chip leads for connection to elements in an electronic system; and separating the large stack into a plurality of small stacks, each of which constitutes a module for use in an electronic system. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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21. A method for forming a plurality of short stacks containing IC chip layers from a large stack of layers, which method comprises:
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providing IC chip layers, each of which chips includes both integrated circuitry and a multiplicity of electrical leads extending from such circuitry to the same edge of the chip; providing non-IC chip layers to serve as bottom and top layers of short stacks; starting the large stack with a non-IC chip layer which is the bottom layer of a first small stack; placing a plurality of IC chip layers above the bottom layer of the first small stack; completing the first small stack with a top layer which is a non-IC chip layer; starting a second small stack by adding to the large stack a non-IC chip layer which is the bottom layer of a second small stack; placing a plurality of IC chip layers above the bottom layer of the second small stack; completing the second small stack with a top layer which is a non-IC chip layer; stacking IC chip layers and non-IC chip layers to provide a plurality of small stacks; securing together with adhesive material all of the adjacent layers in a large stack; said large stack having a planar access surface which contains the end of the electrical leads of the IC chip layers; performing processing steps on the planar access surface of the large stack; and thereafter segmenting the large stack to provide a plurality of individual small stacks. - View Dependent Claims (22, 23)
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24. A method for forming a plurality of short stacks containing IC chip layers from a large stack of layers, which method comprises:
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providing IC chip layers, each of which chips includes both integrated circuitry and a multiplicity of electrical leads extending from such circuitry to the same edge of the chip; providing non-IC chip layers to serve as bottom and top layers of short stacks; starting the large stack with a non-IC chip layer which is the bottom layer of a first small stack; placing a plurality of IC chip layers above the bottom layer of the first small stack; completing the first small stack with a top layer which is a non-IC chip layer; starting a second small stack by adding to the large stack a non-IC chip layer which is the bottom layer of a second small stack; placing a plurality of IC chip layers above the bottom layer of the second small stack; completing the second small stack with a top layer which is a non-IC chip layer; stacking IC chip layers and non-IC chip layers to provide the a plurality of small stacks; securing together with adhesive material all of the adjacent layers within a small stack, but not the top and bottom layers of adjacent small stacks; said large stack having a planar access surface which contains the ends of the electrical leads of the IC chip layers; performing processing steps on the planar access surface of the large stack; and thereafter segmenting the large stack to provide a plurality of individual small stacks.
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Specification