US5076485A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Bonding electrical leads to pads with particles
Assignee: Microelectronics and Computer Technology Corp
•
Filing: 1990-12-20
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Granted: 1991-12-31
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Expires: 2010-12-20
Abstract
Abstract Bonding a plurality of TAB tape leads to electrical pads in and aligned with the surface of a die by covering the pads with a plurality of electrically conductive particles, aligning the electrical leads with the particles and the pads, and simultaneously bonding the particles to the pads and the electrical leads to the particles so that each bonded particle is between and in contact with a pad and a lead. Preferably the particles are solid spheres 1.0 mils in diameter. The spheres may be applied by covering the entire surface with the spheres, covering the pads with an adhesive material prior to the spheres, or covering the pads with a mixture of vehicle and spheres.
Inventors
- 👤 Colin A. MacKay
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 22:12
CPC Classifications
H; H05; H05K; H05K3/00; H05K3/30; H05K3/32; H05K3/321; H10; H10W; H10W20/00; H10W20/40; H10W20/41; H10W20/44; H10W20/4473; H10W72/00; H10W72/01; H10W72/012; H10W72/20; H05K2201/00; H05K2201/10; H05K2201/10613; H05K2201/10621; H05K2201/10681; H05K3/10; H05K3/102; H10W72/071; H10W72/073; H10W72/07331; H10W72/251; H10W72/30; H10W72/321; H10W72/325; H10W72/351; H10W72/352; H10W72/353; H10W72/354; H10W72/90; H10W72/941; H10W72/944; H10W72/9445; Y; Y10; Y10T; Y10T156/00; Y10T156/10; Y10T156/1089
Claims Analysis
Total Claims: 39
Claim 1
Independent Claim
96 words
A method of bonding a first plurality of electrical leads to a second plurality of electrical pads on a top surface of an electronic component, comprising: covering each pad with a plurality of electrically conductive particles; aligning the electrical leads with the particles and pads, wherein portions of the electrical leads extend beyond the outer periphery of the top surface of the electrical component; and simultaneously bonding the particles to the pads and the aligned electrical leads to the particles so that each bonded particle is between and in contact with a pad and a lead.
Claim 2
Independent Claim
96 words
A method of bonding a first plurality of electrical leads to a second plurality of electrical pads on a top surface of an electronic component, comprising: covering each pad with a plurality of electrically conductive particles; aligning the electrical leads with the particles and pads, wherein portions of the electrical leads extend beyond the outer periphery of the top surface of the electrical component; and simultaneously bonding the particles to the pads and the aligned electrical leads to the particles so that each bonded particle is between and in contact with a pad and a lead.
Claim 3
Dependent Claim
23 words
The method of claim 1 wherein the maximum size of the particles is no greater than one-half of the width of the pads.
Claim 4
Dependent Claim
11 words
The method of claim 1 wherein the particles are solid spheres.
Claim 5
Dependent Claim
13 words
The method of claim 1 wherein the particles are solid right circular cylinders.
Claim 6
Dependent Claim
11 words
The method of claim 1 wherein the particles are powder particles.
Claim 7
Independent Claim
19 words
The method of claims 1 wherein prior to bonding the particles extend at least 0.5 mils above the pads.
Claim 8
Dependent Claim
20 words
The method of claim 1 wherein prior to bonding the particles extend approximately 0.5 to 1.5 mils above the pads.
Claim 9
Dependent Claim
30 words
The method of claim 1, including covering the pads with an adhesive material prior to covering the pads with the particles so that the particles will adhere to the pads.
Claim 10
Dependent Claim
39 words
The method of claim 1, including covering the pads with a mixture of vehicle and particles, wherein the vehicle is thick enough at room temperature to hold the particles in place so that the particles adhere to the pads.
Claim 11
Dependent Claim
25 words
The method of claim 8, including covering the surface with a mask exposing only the pads prior to covering the pads with an adhesive material.
Claim 12
Dependent Claim
28 words
The method of claim 9, including covering the surface with a mask exposing only the pads prior to covering the pads with a mixture of vehicle and particles.
Claim 13
Dependent Claim
16 words
The method of claim 8, including covering the pads with an adhesive material by a syringe.
Claim 14
Dependent Claim
19 words
The method of claim 9, including covering the pads with a mixture of vehicle and particles by a syringe.
Claim 15
Dependent Claim
29 words
The method of claim 8 wherein the pads are simultaneously covered with adhesive by a piston and tube assembly having a plurality of openings in alignment with the pads.
Claim 16
Dependent Claim
34 words
The method of claim 9 wherein the pads are simultaneously covered by a mixture of vehicle and particles by a piston and tube assembly having a plurality of openings in alignment with the pads.
Claim 17
Dependent Claim
25 words
The method of claim 9 wherein only the pads are covered by a mixture of vehicle and particles by screen printing through a metal mask.
Claim 18
Dependent Claim
31 words
The method of claim 8, including covering the electrical leads with an adhesive material prior to bonding the electrical leads, and bonding the pads and the aligned leads by adhesive bonding.
Claim 19
Dependent Claim
38 words
The method of claim 9, wherein said vehicle is an adhesive, prior to bonding the electrical leads are covered with an adhesive material, and the particles are bonded to the pads and the aligned leads by adhesive bonding.
Claim 20
Dependent Claim
12 words
The method of claim 9 wherein the vehicle evaporates as bonding occurs.
Claim 21
Dependent Claim
22 words
The method of claim 9 wherein the bonding is provided by adhesive bonding and the vehicle fails to evaporate as bonding occurs.
Claim 22
Dependent Claim
12 words
The method of claim 20 wherein the vehicle is a thermoset plastic.
Claim 23
Dependent Claim
12 words
The method of claim 1 wherein the bonding is by thermocompression bonding.
Claim 24
Dependent Claim
12 words
The method of claim 1 wherein the bonding is by thermosonic bonding.
Claim 25
Dependent Claim
12 words
The method of claim 1 wherein the bonding is by laser bonding.
Claim 26
Dependent Claim
22 words
The method of claim 1 wherein the pads are in and aligned with an essentially smooth top surface of the electrical component.
Claim 27
Independent Claim
101 words
A method of bonding a first plurality of electrical leads to a second plurality of electrical pads on a surface of an electrical component, comprising: pre-aligning the electrical leads with the pads; covering the surface of the electrical component with a plurality of electrically conductive particles; aligning the pre-aligned electrical leads with the particles and the pads; simultaneously bonding the particles to the pads and the aligned electrical leads to the particles so that each bonded particle is between and in contact with a pad and a lead; and then removing the unbonded particles off the surface of the electrical component.
Claim 28
Independent Claim
101 words
A method of bonding a first plurality of electrical leads to a second plurality of electrical pads on a surface of an electrical component, comprising: pre-aligning the electrical leads with the pads; covering the surface of the electrical component with a plurality of electrically conductive particles; aligning the pre-aligned electrical leads with the particles and the pads; simultaneously bonding the particles to the pads and the aligned electrical leads to the particles so that each bonded particle is between and in contact with a pad and a lead; and then removing the unbonded particles off the surface of the electrical component.
Claim 29
Dependent Claim
30 words
The method of claim 26, including enclosing the pads and the surface of the electrical component with a retaining lip for holding the particles on the surface prior to bonding.
Claim 30
Dependent Claim
21 words
The method of claim 27 wherein the height of the retaining lip is approximately one-half of the diameter of the particles.
Claim 31
Dependent Claim
14 words
The method of claim 27 wherein the retaining lip is a flexible metal strip.
Claim 32
Dependent Claim
22 words
The method of claim 26 wherein the pads are in and aligned with an essentially smooth top surface of the electrical component.
Claim 33
Independent Claim
114 words
A method of bonding a plurality of electrical leads of a TAB tape to a plurality of electrical contacts on a surface of an integrated circuit die, comprising: pre-aligning the leads with the contacts; enclosing the contacts and the surface of the die with a retaining lip; covering the contacts and the surface within the retaining lip with a single layer of solid electrical particles; aligning the pre-aligned leads with the contacts; simultaneously bonding the leads to the particles on the contacts and bonding the particles on the contacts so that each bonded particle is between and in contact with a contact and a lead; and then removing the unbonded particles from the surface.
Claim 34
Independent Claim
114 words
A method of bonding a plurality of electrical leads of a TAB tape to a plurality of electrical contacts on a surface of an integrated circuit die, comprising: pre-aligning the leads with the contacts; enclosing the contacts and the surface of the die with a retaining lip; covering the contacts and the surface within the retaining lip with a single layer of solid electrical particles; aligning the pre-aligned leads with the contacts; simultaneously bonding the leads to the particles on the contacts and bonding the particles on the contacts so that each bonded particle is between and in contact with a contact and a lead; and then removing the unbonded particles from the surface.
Claim 35
Dependent Claim
21 words
The method of claim 31 wherein the height of the retaining lip is approximately one-half of the diameter of the particles.
Claim 36
Dependent Claim
11 words
The method of claim 31 wherein the particles are solid spheres.
Claim 37
Dependent Claim
17 words
The method of claim 33 wherein the solid spheres have a diameter of at least 0.5 mils.
Claim 38
Dependent Claim
13 words
The method of claim 31 wherein the particles are solid right circular cylinders.
Claim 39
Dependent Claim
21 words
The method of claim 31 wherein the contacts are in and aligned with an essentially smooth top surface of the die.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1994-12-30 | 1995-07-01 | 1995-12-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-12-30 | 1999-07-01 | 1999-12-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-12-30 | 2003-07-01 | 2003-12-31 | $7700.00 | Window Closed / Lapsed |