Nordson Corporation

Jiangang Zhao

James Donald Getty

David Keating Foote

Horatio Quinones

Alec J Babiarz

Thomas L Ratledge

Methods for applying an underfill with vacuum assistance. The method may include dispensing the underfill onto a substrate proximate to at least one exterior edge of an electronic device attached to the substrate. A space between the electronic device and the substrate is evacuated through at least one gap in the underfill. The method further includes heating the underfill to cause the underfill to flow into the space. Because a vacuum condition is supplied in the open portion of the space before flow is initiated, the incidence of underfill voiding is lowered.

Methods for vacuum assisted underfilling

In an embodiment of the present invention, a method is provided for fabricating an electronics assembly having a substrate and a plurality of circuit elements. The method includes forming a liquid barrier on the substrate, placing a first circuit element on one side of the liquid barrier, and placing a second circuit element on the opposite side of the liquid barrier. A liquid is applied to the first circuit element. The method further includes using the liquid barrier to prevent the liquid applied to the first circuit element from contaminating the second circuit element so that the spacing between the first and second circuit elements can be minimized.

Methods of fabricating electronics assemblies

A method for removing thin layers of a two-component molding material from areas on a substrate. The method includes using a plasma formed using a first gas mixture for removing one component of the molding material and a plasma formed using a different second gas mixture for removing the other component of the molding material. For filled epoxies commonly used as molding materials, the first gas mixture may be an oxygen-rich mixture of an oxygen-containing gas species and a fluorine-containing gas species, and the second gas mixture may be a fluorine-rich mixture of the same gases.

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Concord, CA, United States of America

Jiangang Zhao