Method and apparatus for measuring the vibration amplitude on an energy transducer
US5199630A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 22, 1992 |
| Grant date | Apr 6, 1993 |
| Priority date | — |
| Expiry date | Jan 22, 2012 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01L2924/19042
- WIPO fieldSemiconductors
- WIPO sectorElectrical engineering
Abstract
A method, and apparatus for performing the method, for the ultrasonic contacting wired connection of electrical circuits to metallic leadframe strips, which apparatus essentially includes a bonding head with the energy transducer located thereon for feeding to the process point of the leadframe strip and for producing a longitudinal vibration amplitude is supplied with a first voltage, the bonding head is associated a measuring head fixed to a machine base, and the measuring head has an optical/electrical sensor which measures the instantaneous amplitude of the longitudinal vibration of the infeed of the bonding head and determining a correction factor mathematically from the measured quantities obtained, and the first ultrasonic value for the vibration amplitude of the energy transducer is calibrated with the correction factor.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.