Printed circuit board processing apparatus
US5711806A · kind A · utility
Inventor
Key dates
| Filing date | Mar 13, 1996 |
| Grant date | Jan 27, 1998 |
| Priority date | — |
| Expiry date | Mar 13, 2016 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH05K3/0085
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A machine for use in chemically processing printed circuit board work pieces includes an inner basin within an outer basin. The inner basin holds a chemical liquid bath through which the printed circuit board work pieces are passed by a conveyor in a horizontal orientation along an action line parallel to their own plane. The conveyor includes facilities to oscillate the work pieces perpendicularly to their plane in the chemical liquid bath to effect flow of the chemical liquid through holes and apertures of the work pieces. Part of the chemical liquid bath continuously drains from the inner basin to the outer basin as the chemical treatment process is in operation. An eductor draws liquid from the outer basin and effects a low-pressure, high-volume up-welling of liquid into the inner basin. In this way, stirring of the chemical liquid bath is effected, and both temperature and concentration stratification of the chemical liquid bath is avoided. A chemical processing line may include several layers of the machines ranked one above the other to increase output with no increase in required floor space.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.