US3891822A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pulse heated thermocompression bonding apparatus
Assignee: WELDMATIC CORP
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Filing: 1973-04-02
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Granted: 1975-06-24
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Expires: 1993-04-02
Abstract
Abstract A pulse heated thermocompression wire bonding apparatus having precise control of bonding temperature and duration. The bonder utilizes an electrically heated holder which surrounds a substantial portion of the barrel of a capillary bonding tip and achieves tip heating by thermal transfer. A thermocouple is attached to the holder to continuously sense the temperature of the bonding tip. The bonder includes a power supply for providing heating power and programming controls to preset the bonding temperature and bond time duration for each bond to be performed by the apparatus. In conjunction with the thermocouple, the programmable bonding controls determine the amount of heat energy supplied to the bonding tip to maintain the tip at the desired bonding temperature throughout the bonding interval. Suitable delays following completion of each bond can also be programmed into the bonder.
Inventors
- 👤 Joseph L Laub
- 👤 John F Hurst
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 18:37
CPC Classifications
B; B23; B23K; B23K20/00; B23K20/002; B23K20/004; B23K20/005; H; H10; H10W; H10W72/00; H10W72/071; H10W72/0711; H10W72/07141; H10W72/075; H10W72/07531; H10W72/07532; H10W72/07541; H10W72/50; H10W72/551; H10W72/552; H10W72/5522
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
238 words
A pulse-heated thermocompression wire bonding apparatus comprising; a capillary bonding tip having a wire to be bonded threadedly extending therethrough; a holder supported by the bonding apparatus for receiving the tip in a thermal transfer relationship therewith; electric power supply means connected to the holder; means for moving the holder and tip such that the wire is contacted to a bonding location; temperature control means connected to the power supply for limiting the amount of electric current heating energy supplied to the holder to an amount sufficient to raise the tip to a predetermined bonding temperature; temperature monitoring means disposed in a sensing relationship with respect to the holder connected to the power supply means for interrupting the supply of electric current heating energy upon attainment of the predetermined bonding temperature at the holder and tip; timing means responsive to the sensing of a predetermined temperature of the holder by the temperature monitoring means for maintaining contact of the wire of the bonding location for a predetermined interval of time; feedback means interconnecting the power supply and temperature monitoring means for causing additional electric current heating energy to be supplied to the holder to maintain the temperature of the tip at the predetermined bonding temperature during the interval of contact of the wire at the bonding location; and means for interrupting the supply of electric current heating energy to the tip responsive to termination of the bonding interval.
Claim 2
Dependent Claim
238 words
A pulse-heated thermocompression wire bonding apparatus comprising; a capillary bonding tip having a wire to be bonded threadedly extending therethrough; a holder supported by the bonding apparatus for receiving the tip in a thermal transfer relationship therewith; electric power supply means connected to the holder; means for moving the holder and tip such that the wire is contacted to a bonding location; temperature control means connected to the power supply for limiting the amount of electric current heating energy supplied to the holder to an amount sufficient to raise the tip to a predetermined bonding temperature; temperature monitoring means disposed in a sensing relationship with respect to the holder connected to the power supply means for interrupting the supply of electric current heating energy upon attainment of the predetermined bonding temperature at the holder and tip; timing means responsive to the sensing of a predetermined temperature of the holder by the temperature monitoring means for maintaining contact of the wire of the bonding location for a predetermined interval of time; feedback means interconnecting the power supply and temperature monitoring means for causing additional electric current heating energy to be supplied to the holder to maintain the temperature of the tip at the predetermined bonding temperature during the interval of contact of the wire at the bonding location; and means for interrupting the supply of electric current heating energy to the tip responsive to termination of the bonding interval.
Claim 3
Dependent Claim
50 words
An apparatus according to claim 1 wherein the feedback means includes programming means associated with the temperature monitoring means in a feedback relationship therewith and with the timing means for limiting the duration of time the tip is maintained in contact with the bonding location at the predetermined bonding temperature.
Claim 4
Dependent Claim
56 words
An apparatus according to claim 2 having a two bond cycle wherein said programming means includes first and second progrAmming means in a first channel in the apparatus for establishing a bonding schedule for a first bond and third and fourth programming means in a second channel for establishing a bonding schedule for a second bond.
Claim 5
Dependent Claim
39 words
An apparatus according to claim 3 wherein said second and fourth programming means are associated with the timing means for presetting the duration of the interval for the application of heat and pressure between first and second bond location.
Claim 6
Dependent Claim
25 words
An apparatus according to claim 1 wherein the holder defines a tip receiving aperture and adjustable clamping means for securing the tip in said aperture.
Claim 7
Dependent Claim
28 words
An apparatus according to claim 5 wherein said holder defines an electric current carrying path around said tip such that heating of said tip is by heat transfer.
Claim 8
Dependent Claim
39 words
An apparatus according to claim 6 wherein the holder comprises a pair of strips of a conductive material having opposed arched portions, the strips being secured together such that the arched portions define the capillary tip receiving aperture therebetween.
Claim 9
Dependent Claim
39 words
An apparatus according to claim 3 wherein said first and third programming means are associated with said temperature monitoring means in a feedback relationship therewith for controlling the amount of heat supplied to said first and second bond locations.
Claim 10
Dependent Claim
28 words
An apparatus according to claim 8 including fifth programming means for introducing a predetermined amount of delay in the operation of the apparatus subsequent to the second bond.
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) | 1978-06-23 | 1978-12-23 | 1979-06-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-06-23 | 1982-12-23 | 1983-06-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-06-23 | 1986-12-23 | 1987-06-24 | $7700.00 | Window Closed / Lapsed |