Method and apparatus to evaluate effectiveness of cleaning systems for high density electronics
AssigneeCeridian Corporation
InventorsDeepak K. Pai, Gene A. Maday
Life of this patent
Estimating the term…
Abstract
An apparatus and method for a cleaning process control is disclosed. The apparatus includes two parallel plates of glass that have a plurality of shims positioned therebetween and a means for clamping these plates of glass firmly against the shims. A contaminant is positioned between the plates of glass and the apparatus is cleaned using a selected cleaning process. The apparatus can then be inspected to determine the effectiveness of a particular cleaning process by peering through the transparent glass plates to inspect for any remaining contaminant. The apparatus can then be cleaned more extensively and used again to check a different cleaning process.
Claims16
A device for testing a selected cleaning process and cleaner used to remove residue resulting from solder connection of components to printed wiring boards, the device comprising:
- first and second members each of which having a planar surface with at least one of the first and second members being transparent;
- spacing means positioned between a portion of the planar surfaces of each of the first and second members for maintaining a selected separation therebetween;
- means which provides an electric field between the planar surfaces for promoting electrolysis in the presence of electrolytes in solution;
- and
- clamping means engaging each of the first and second members opposite the planar surfaces for maintaining the planar surfaces of the first and second members in engagement with the spacing means, the planar surface of at least one of the first and second members being disposed and arranged to support material constituting the residue, the clamping means and spacing means being disposed and arranged to allow opposing planar surfaces atmospheric exposure.
An apparatus for testing a selected cleaning process and cleaner comprising:
- a transparent plate;
- a pattern of electrically conductive material positioned proximate the transparent plate having a first and second terminal configured for connection to a constant polarity electromotive force for promoting electrolysis in the presence of one of electrolytes in solution or molten salts, the pattern comprising:
- a plurality of first spaced apart electrical conductors electrically connected to the first terminal, the plurality of first electrical conductors having a plurality of orientations;
- and
- a plurality of second spaced apart electrical conductors electrically connected to the second terminal, and interleaved with the plurality of first electrical conductors is the plurality of second electrical conductors.
A method for testing a selected cleaning process and cleaner used to remove residue resulting from solder connection of components to printed wiring boards, the method comprising:
- providing a transparent member having a planar surface having a first electrical conductor spaced from a second electrical conductor;
- placing a residue on the planar surface of the transparent member;
- cleaning the transparent member using the selected cleaning process;
- applying an electromotive force to the first and second electrical conductors to generate an electric field which promotes electrolysis in electrolytes in solution;
- and
- inspecting the transparent member for corrosion by viewing through the transparent member thereof.
Dependencies are inferred from the claim text.