Integrated circuit substrate having through hole markings to indicate defective/non-defective status of same
First Claim
1. An integrated circuit package substrate for mounting at least one die, said package substrate having at least one hole, said at least one hole being blocked by a light blocking material which is selectively removable to indicate the status of said package substrate as defective or non-defective.
1 Assignment
0 Petitions
Accused Products
Abstract
A method and apparatus is provided to identify defective laminate objects or package substrates having mounting sites for integrated circuit dies during the package substrate fabrication process. A hole is drilled or punched within the boundary of an individual package substrate contained within a larger laminate substrate and covered with a material layer coating composed of an opaque material such as a resist. The coating may then be selectively applied or removed at a later point during the fabrication process dependent upon whether the package substrate has been classified as defective or non-defective. After specific package substrates have been marked as defective, a light source and light collector are supplied to the fabrication process on opposite sides of the wafer. By shining the light source on the laminate substrate, defective package substrates can be identified by the passage of light through the hole which is no longer covered with resist. A package substrate may have one or many holes corresponding to one or many die mounting sites. Therefore, defective package substrates may be identified through the use of a simple light source and light collector and without the need for unnecessary expensive optical recognition or sorting machinery.
41 Citations
24 Claims
- 1. An integrated circuit package substrate for mounting at least one die, said package substrate having at least one hole, said at least one hole being blocked by a light blocking material which is selectively removable to indicate the status of said package substrate as defective or non-defective.
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17. An integrated circuit package substrate comprising a plurality of die mounting sites each for mounting an integrated circuit die, said package substrate having a hole, said hole being blocked by a light blocking material which is selectively removable to indicate the status of said package substrate as defective or non-defective.
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18. An integrated circuit package substrate comprising a plurality of die mounting sites each for mounting an integrated circuit die, each of said die mounting sites having a hole, said hole being blocked by a light blocking material which is selectively removable to indicate the status of said package substrate as defective or non-defective.
- 19. An integrated circuit package substrate array comprising a plurality of separable package substrates for mounting at least one integrated circuit die, each of said package substrates having at least one hole, said at least one hole being blocked by a light blocking material which is selectively removable to indicate the status of said package substrate as defective or non-defective.
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24. An integrated circuit package substrate for mounting at least one die, said package substrate having a plurality of holes, each of said holes being blocked by a light blocking material which is selectively removable from at least one of said holes to form a binary code pattern to indicate the status of said package substrate as defective or non-defective.
Specification