Conductive adhesive film techniques
First Claim
1. A method for interconnecting a first conductor array of an electronic device to a second conductor array of a first substrate comprising the steps of:
- using photolithographic masking and etching to form a matrix array of mutually isolated ferromagnetic elements;
magnetizing the ferromagnetic elements;
causing a layer of ferromagnetic conductive particles to adhere to an upper surface of each of the ferromagnetic elements;
contacting the layer of particles with a layer of softened adhesive to cause penetration of the particles into the adhesive;
hardening the adhesive to cause containment of the particles therein;
removing the hardened adhesive containing the particles and locating it between the first and second conductor arrays;
softening the adhesive and compressing the adhesive between the first and second conductor arrays, thereby to cause it to adhere to the conductor arrays and causing individual particles to make simultaneous contact with conductors of the first and second conductor arrays to interconnect the electronic device to the first substrate.
1 Assignment
0 Petitions
Accused Products
Abstract
In one embodiment of the invention, photolithographic masking and etching is used to form a matrix array of mutually isolated ferromagnetic elements (25'"'"'). The elements are magnetized and a single layer of conductive ferromagnetic particles (33) is adhered to an upper surface of each of the ferromagnetic elements. The layer of particles is contacted with a layer of soft adhesive polymer (36) to cause penetration of the particles into the polymer. The adhesive polymer is then hardened to assure containment of the particles in the polymer. The hardened adhesive polymer is removed and located between the first and second conductor arrays (40-43) that is to be interconnected; for example, it is located between the bonding pads (43) of a chip (42) and the bonding pads (40) of a substrate (39) to which the chip is to be connected. The adhesive polymer is then softened by heating and compressed between the first and second conductor arrays to cause it to adhere to the conductor arrays and to interconnect them and is thereafter hardened to form a unified structure.
100 Citations
17 Claims
-
1. A method for interconnecting a first conductor array of an electronic device to a second conductor array of a first substrate comprising the steps of:
-
using photolithographic masking and etching to form a matrix array of mutually isolated ferromagnetic elements; magnetizing the ferromagnetic elements; causing a layer of ferromagnetic conductive particles to adhere to an upper surface of each of the ferromagnetic elements; contacting the layer of particles with a layer of softened adhesive to cause penetration of the particles into the adhesive; hardening the adhesive to cause containment of the particles therein; removing the hardened adhesive containing the particles and locating it between the first and second conductor arrays; softening the adhesive and compressing the adhesive between the first and second conductor arrays, thereby to cause it to adhere to the conductor arrays and causing individual particles to make simultaneous contact with conductors of the first and second conductor arrays to interconnect the electronic device to the first substrate. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
-
-
10. A method for interconnecting a first bonding pad array of an electronic device to a second bonding pad array of a first substrate comprising the steps of:
-
distributing on an upper surface of a first body an array of mutually isolated groups of conductive particles, each group containing a plurality of conductive particles arranged as a single layer; contacting the layer of particles with a layer of softened adhesive to cause penetration of the particles into the adhesive; hardening the adhesive, thereby to cause containment of the particles in the adhesive; removing the hardened adhesive containing the particles and locating it between the first and second bonding pad arrays; softening the adhesive and compressing the adhesive between the first and second bonding pad arrays, thereby causing it to bond together matching bonding pads and causing individual particles to make simultaneous contact with matching bonding pads on the first and second arrays to interconnect the electronic device to the first substrate. - View Dependent Claims (11, 12, 13, 16)
-
-
14. A method for making anisotropic conductive material comprising the steps of:
-
using photolithographic masking and etching to form a matrix array of mutually isolated magnetized elements; causing a layer of ferromagnetic particles to adhere to an upper surface of each of the magnetized elements; contacting the layer of particles with a layer of softened insulative material to cause penetration of the particles into the insulative material; hardening the insulative material to cause containment of the particles therein; and removing the hardened insulative material containing the particles. - View Dependent Claims (15, 17)
-
Specification