Method of attaching a chip to a flexible substrate
First Claim
1. An electronic circuit, comprising:
- an electronic component having bump terminations on a first surface thereof;
a flexible substrate having a plurality of generally round holes therein arranged in correspondence with said bump terminations, wherein each of said holes is defined by a hole periphery of said substrate immediately about each hole, wherein each hole has a diameter d smaller than a largest diameter D of a corresponding bump termination; and
an array of conductive circuit traces arranged on a second surface of said substrate, wherein each of said circuit traces terminates proximate one of the holes in said substrate;
each bump terminator being fixably inserted into its corresponding hole in said substrate so as to stretch its corresponding hole periphery and enlarge said corresponding hole, thereby providing a compressive gripping force exerted by each stretched hole periphery on its corresponding bump termination, so as to mechanically connect said electronic component with said substrate and to electrically connect each termination with a corresponding circuit trace.
12 Assignments
0 Petitions
Accused Products
Abstract
There is disclosed herein an electronic circuit, one embodiment of which comprises: an electronic component 10 having bump terminations 12 on a first surface 14 thereof; a flexible substrate 16 having a plurality of generally round holes 18 therein arranged in correspondence with the bump terminations, wherein each hole has a diameter d smaller than the diameter D of a corresponding bump termination; and an array of conductive circuit traces 20 arranged on a second surface 22 of the substrate, wherein each of the circuit traces terminates generally about one of the holes in the substrate. Each bump termination 12 is fixably inserted into its corresponding substrate hole 18 so as to mechanically connect the electronic component 10 with the substrate 16 and to electrically connect each termination 12 with a corresponding circuit trace 20.
24 Citations
20 Claims
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1. An electronic circuit, comprising:
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an electronic component having bump terminations on a first surface thereof; a flexible substrate having a plurality of generally round holes therein arranged in correspondence with said bump terminations, wherein each of said holes is defined by a hole periphery of said substrate immediately about each hole, wherein each hole has a diameter d smaller than a largest diameter D of a corresponding bump termination; and an array of conductive circuit traces arranged on a second surface of said substrate, wherein each of said circuit traces terminates proximate one of the holes in said substrate; each bump terminator being fixably inserted into its corresponding hole in said substrate so as to stretch its corresponding hole periphery and enlarge said corresponding hole, thereby providing a compressive gripping force exerted by each stretched hole periphery on its corresponding bump termination, so as to mechanically connect said electronic component with said substrate and to electrically connect each termination with a corresponding circuit trace. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. An electronic circuit, comprising:
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an electronic component having bump terminations on a first surface thereof, a flexible substrate having a plurality of generally round holes therein arranged in correspondence with said bump terminations, wherein each of said holes is defined by a hole periphery of said substrate immediately about each hole, wherein each hole has a diameter d smaller than a largest diameter D of a corresponding bump termination; and an array of conductive circuit traces arranged on a second surface of said substrate, wherein each of said circuit traces terminates proximate one of the holes in said substrate; wherein each bump termination has a substantially bulbous profile having; a neck portion attached to said substrate and having a diameter dN, and an end portion distal from said substrate and having a diameter D, wherein D>
dN >
d;each bump termination being fixably inserted into its corresponding hole in said substrate so as to stretch its corresponding hole periphery and enlarge said corresponding hole, thereby providing a compressive gripping force exerted by each stretched hole periphery on its corresponding bump termination, so as to mechanically connect said electronic component with said substrate and to electrically connect each termination with a corresponding circuit trace. - View Dependent Claims (17, 18, 19)
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20. An electronic circuit, comprising:
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an electronic component having bump terminations on a first surface thereof; a flexible substrate having a plurality of generally round holes therein arranged in correspondence with said bump terminations, wherein each of said holes is defined by a hole periphery of said substrate immediately about each hole, wherein each hole has a diameter d smaller than a largest diameter D of a corresponding bump termination; and an array of conductive circuit traces arranged on a second surface of said substrate, wherein each of said circuit traces terminates proximate one of the holes in said substrate; wherein each bump termination has a substantially bulbous profile having; a neck portion attached to said substrate and having a diameter dN, and an end portion distal form said substrate and having a diameter D, wherein D>
dN >
d;wherein said bump terminations have an average bump height and wherein said substrate has a thickness between 20% and 50% of the average bump height, inclusive; each bump termination being fixably inserted into its corresponding hole in said substrate so as to stretch its corresponding hole periphery and enlarge said corresponding hole, thereby providing a compressive gripping force exerted by each stretched hole periphery on its corresponding bump termination, so as to mechanically connect said electronic component with said substrate and to electrically connect each termination with a corresponding circuit trace.
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Specification