Method and apparatus for dispensing spherical-shaped quantities of liquid solder
US5229016A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 8, 1991 |
| Grant date | Jul 20, 1993 |
| Priority date | — |
| Expiry date | Aug 8, 2011 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH05K3/3457
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
Abstract
A method and apparatus for producing solidified solder balls and for ejecting generally spherical-shaped drops of liquid solder through a controlled atmosphere to impact on a surface to be wetted is disclosed. The apparatus comprises a preload reservoir to hold and maintain solder in a liquid state, an ejection chamber to hold and maintain the solder in a liquid state, a connection between the preload reservoir and the ejection chamber to allow liquid solder in the preload reservoir to be transferred to the ejection chamber while maintaining the oxides in the preload reservoir, a device to pressurize the ejection chamber with an inert gas and an ejection device operatively connected to receive liquid solder from the ejection chamber and to eject generally spherical-shaped drops of liquid solder to a specific location on a surface to be wetted. Structure is included to provide an atmosphere of inert gas between the ejection device and the specific location on a surface to be wetted. The method includes the steps of maintaining solder in a liquid state in a reservoir, transferring solder in the liquid state from the reservoir to an ejection chamber, maintaining the transferred solder…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.