US5214963A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for testing inner lead bonds
Assignee: Hewlett Packard Development Co LP
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Filing: 1991-06-28
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Granted: 1993-06-01
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Expires: 2011-06-28
Abstract
Abstract A process for nondestructive testing of beam lead bonds in disclosed. A high pressure liquid jet is applied to the beam leads adjacent the bond pad such that a force is applied to the lead in the opposite direction of the bonding step. If the bond does not have sufficient strength, the lead is bent away from the bonding pad and can be detected either visually or electrically. If the bond does have sufficient strength to withstand the force, no degradation of the bond occurs.
Inventors
- 👤 David C. Widder
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 09:35
CPC Classifications
G; G01; G01N; G01N3/00; G01N2203/00; G01N2203/003; G01N2203/0042; G01N2203/02; G01N2203/026; G01N2203/0296
Claims Analysis
Total Claims: 24
Claim 1
Independent Claim
91 words
A process for verifying the integrity of lead bonds comprising the steps of; placing a device having leads bonded thereto in a test apparatus; impinging said leads with a liquid jet at a point adjacent said bonds and in a direction such that a predetermined force tending to separate said bonds is applied to said leads, said liquid jet having a diameter at the point of impingement which is less than or equal to the width of the narrowest of said leads; and determining whether any of said bonds is broken.
Claim 2
Dependent Claim
91 words
A process for verifying the integrity of lead bonds comprising the steps of; placing a device having leads bonded thereto in a test apparatus; impinging said leads with a liquid jet at a point adjacent said bonds and in a direction such that a predetermined force tending to separate said bonds is applied to said leads, said liquid jet having a diameter at the point of impingement which is less than or equal to the width of the narrowest of said leads; and determining whether any of said bonds is broken.
Claim 3
Dependent Claim
11 words
A process according to claim 1 wherein said liquid is water.
Claim 4
Dependent Claim
14 words
A process according to claim 1 wherein said device has TAB leads bonded thereto.
Claim 5
Dependent Claim
20 words
A process according to claim 3 wherein said liquid jet applies a force of about 8 grams to said leads.
Claim 6
Dependent Claim
17 words
A process according to claim 1 wherein said determining step comprises visually examining said leads and bonds.
Claim 7
Dependent Claim
15 words
A process according to claim 1 wherein said determining step comprises electrically testing said device.
Claim 8
Dependent Claim
16 words
A process according to claim 1 further comprising rebonding any leads which separated from said device.
Claim 9
Dependent Claim
22 words
A process according to claim 1 wherein the direction of impingement is perpendicular to a surface to which said leads are bonded.
Claim 10
Dependent Claim
73 words
A process for verifying the integrity of inner lead bonds comprising the steps of: placing a device having leads bonded thereto in a test apparatus; applying a high pressure jet of water against said leads in a direction perpendicular to a surface to which said leads are bonded with a predetermined force such that defective bonds are separated; and identifying any separated bonds so that said leads can be rebonded to said device.
Claim 11
Dependent Claim
73 words
A process for verifying the integrity of inner lead bonds comprising the steps of: placing a device having leads bonded thereto in a test apparatus; applying a high pressure jet of water against said leads in a direction perpendicular to a surface to which said leads are bonded with a predetermined force such that defective bonds are separated; and identifying any separated bonds so that said leads can be rebonded to said device.
Claim 12
Dependent Claim
33 words
A process according to claim 9 wherein said water jet has a diameter at the point of impingement which is less than or equal to the width of the narrowest of said leads.
Claim 13
Dependent Claim
17 words
A process according to claim 9 wherein said identifying step comprises visually inspecting said leads and bonds.
Claim 14
Dependent Claim
15 words
A process according to claim 9 wherein said identifying step comprises electrically testing said device.
Claim 15
Independent Claim
63 words
An apparatus for testing the integrity of inner lead bonds comprising: a support for holding a die having leads bonded thereto; and means for applying a liquid jet against said leads with a predetermined force at a point adjacent said bonds and in a direction perpendicular to a surface to which said leads are bonded such that it tends to separate said bonds.
Claim 16
Independent Claim
63 words
An apparatus for testing the integrity of inner lead bonds comprising: a support for holding a die having leads bonded thereto; and means for applying a liquid jet against said leads with a predetermined force at a point adjacent said bonds and in a direction perpendicular to a surface to which said leads are bonded such that it tends to separate said bonds.
Claim 17
Dependent Claim
19 words
An apparatus according to claim 13 wherein said applying means comprises a nozzle connected to a suitable liquid source.
Claim 18
Dependent Claim
36 words
An apparatus according to claim 14 wherein said nozzle produces a liquid jet having a diameter at the point of impingement which is less than or equal to the width of the narrowest of said leads.
Claim 19
Dependent Claim
31 words
An apparatus according to claim 13 further comprising means for moving said support and said applying means relative to each other such that all leads bonded to said die are tested.
Claim 20
Dependent Claim
15 words
An apparatus according to claim 16 wherein said moving means comprises an x-y positioning table.
Claim 21
Independent Claim
76 words
An apparatus for testing the integrity of inner lead bonds comprising: a support for holding a die having leads bonded thereto; and means for applying a liquid jet against said leads with a predetermined force at a point adjacent said bonds and in a direction tending to separate said bonds, said liquid jet having a diameter at the point of impingement which is less than or equal to the width of the narrowest of said leads.
Claim 22
Independent Claim
76 words
An apparatus for testing the integrity of inner lead bonds comprising: a support for holding a die having leads bonded thereto; and means for applying a liquid jet against said leads with a predetermined force at a point adjacent said bonds and in a direction tending to separate said bonds, said liquid jet having a diameter at the point of impingement which is less than or equal to the width of the narrowest of said leads.
Claim 23
Dependent Claim
19 words
An apparatus according to claim 18, wherein said applying means comprises a nozzle connected to a suitable liquid source.
Claim 24
Dependent Claim
25 words
An apparatus according to claim 18, wherein said liquid jet is applied in a direction perpendicular to a surface to which said leads are bonded.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1996-05-31 | 1996-11-30 | 1997-06-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-05-31 | 2000-11-30 | 2001-06-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-05-31 | 2004-11-30 | 2005-06-01 | $7700.00 | Window Closed / Lapsed |