Stabilization of bonding force during ultrasonic wire and ribbon bonding
To improve the quality of ultrasonic wire and ribbon bonding, the author propose a methodology for stabilizing the bonding force by compensating the rigidity of ultrasonic transducer (UST) mount in the ultrasonic / thermosonic bonding cycle. The author analyze the construction of ultrasonic technolo...
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| Format: | Article |
| Language: | English |
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Politehperiodika
2021-03-01
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| Series: | Tekhnologiya i Konstruirovanie v Elektronnoi Apparature |
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| Online Access: | https://tkea.com.ua/index.php/journal/article/view/86 |
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| _version_ | 1850211285301460992 |
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| author | Igor Petuhov |
| author_facet | Igor Petuhov |
| author_sort | Igor Petuhov |
| collection | DOAJ |
| description | To improve the quality of ultrasonic wire and ribbon bonding, the author propose a methodology for stabilizing the bonding force by compensating the rigidity of ultrasonic transducer (UST) mount in the ultrasonic / thermosonic bonding cycle. The author analyze the construction of ultrasonic technological systems and factors affecting the stability of the bonding process. The bonding force is controlled by an electromagnetic unit based on a coil in the field of a constant magnet, the force being directly proportional to the flowing current in the coil. The rigidity of ultrasonic transducer mount was compensated by the data obtained during the preliminary calibration of the change in the mount force over the entire UST overrun range. The calibration in this case is performed with no current flowing through the coil. The force value can be picked up from a digital force sensor. The force values are simultaneously compared with the digitized signal of the deformation sensor. The obtained data is stored in the memory of the wire bonder.
In the bonding cycle, after the moment of contact is determined, the drive unit moves the bonding head vertically by the value of a predetermined distance of approximately one diameter of the bonding wire. This causes the movable part of the UST mount to rise and the force to increase. This increase is compensated by the automatic reduction of the current in the electromagnetic coil, which allows maintaining the preset force at the specified level. The bonding force during bonding is compensated in the same way, with the difference that the vector of force compensation changes – the force should increase with an increase in the deformation of the bonding wire. The implementation of the proposed algorithm made it possible to improve the bonding force stabilization to 20% when bonding thick wire, as well as to improve bonding quality. The proposed solution is also applicable in other technological ultrasound bonding systems, including bonding wire with the diameter of <100 microns. |
| format | Article |
| id | doaj-art-87af93bd1cec4f9fbc5649b223f139db |
| institution | OA Journals |
| issn | 2225-5818 2309-9992 |
| language | English |
| publishDate | 2021-03-01 |
| publisher | Politehperiodika |
| record_format | Article |
| series | Tekhnologiya i Konstruirovanie v Elektronnoi Apparature |
| spelling | doaj-art-87af93bd1cec4f9fbc5649b223f139db2025-08-20T02:09:35ZengPolitehperiodikaTekhnologiya i Konstruirovanie v Elektronnoi Apparature2225-58182309-99922021-03-011–2495386Stabilization of bonding force during ultrasonic wire and ribbon bondingIgor Petuhov0OCJC "Planar-SO"To improve the quality of ultrasonic wire and ribbon bonding, the author propose a methodology for stabilizing the bonding force by compensating the rigidity of ultrasonic transducer (UST) mount in the ultrasonic / thermosonic bonding cycle. The author analyze the construction of ultrasonic technological systems and factors affecting the stability of the bonding process. The bonding force is controlled by an electromagnetic unit based on a coil in the field of a constant magnet, the force being directly proportional to the flowing current in the coil. The rigidity of ultrasonic transducer mount was compensated by the data obtained during the preliminary calibration of the change in the mount force over the entire UST overrun range. The calibration in this case is performed with no current flowing through the coil. The force value can be picked up from a digital force sensor. The force values are simultaneously compared with the digitized signal of the deformation sensor. The obtained data is stored in the memory of the wire bonder. In the bonding cycle, after the moment of contact is determined, the drive unit moves the bonding head vertically by the value of a predetermined distance of approximately one diameter of the bonding wire. This causes the movable part of the UST mount to rise and the force to increase. This increase is compensated by the automatic reduction of the current in the electromagnetic coil, which allows maintaining the preset force at the specified level. The bonding force during bonding is compensated in the same way, with the difference that the vector of force compensation changes – the force should increase with an increase in the deformation of the bonding wire. The implementation of the proposed algorithm made it possible to improve the bonding force stabilization to 20% when bonding thick wire, as well as to improve bonding quality. The proposed solution is also applicable in other technological ultrasound bonding systems, including bonding wire with the diameter of <100 microns.https://tkea.com.ua/index.php/journal/article/view/86ultrasonic bond headbonding forcecurrent stabilization in wire coilultrasonic transducerultrasonic transducer mountflat-parallel plates |
| spellingShingle | Igor Petuhov Stabilization of bonding force during ultrasonic wire and ribbon bonding Tekhnologiya i Konstruirovanie v Elektronnoi Apparature ultrasonic bond head bonding force current stabilization in wire coil ultrasonic transducer ultrasonic transducer mount flat-parallel plates |
| title | Stabilization of bonding force during ultrasonic wire and ribbon bonding |
| title_full | Stabilization of bonding force during ultrasonic wire and ribbon bonding |
| title_fullStr | Stabilization of bonding force during ultrasonic wire and ribbon bonding |
| title_full_unstemmed | Stabilization of bonding force during ultrasonic wire and ribbon bonding |
| title_short | Stabilization of bonding force during ultrasonic wire and ribbon bonding |
| title_sort | stabilization of bonding force during ultrasonic wire and ribbon bonding |
| topic | ultrasonic bond head bonding force current stabilization in wire coil ultrasonic transducer ultrasonic transducer mount flat-parallel plates |
| url | https://tkea.com.ua/index.php/journal/article/view/86 |
| work_keys_str_mv | AT igorpetuhov stabilizationofbondingforceduringultrasonicwireandribbonbonding |