International Business Machines Corporation

Kris Allan Slesinger

Joseph Donald Poole

Michael Camillo Weller

Wilton L Cox

Allen Thomas Mays

John Gillette Davis

A method and system for determining component dimensional information in a component placement system. The component information is derived from the pick and place equipment which is used to place the components on the substrate. The component is grasped at substantially the centroid position and moved over the aperture of a camera. The edges of the component are located, and from the edges an accurate location of the centroid may be obtained. The centroid, as well as the length, width and thickness of the component is stored in a database for use during placing of the component. Other features derived include orientation indicia obtained from component features which are viewed by the camera. During placement, all features associated with the component necessary to accurately locate the component on a substrate are obtained from the database.

Method and system for determining component dimensional information

A method of mounting a component on a substrate includes applying a conductive adhesive on a contact pad joined to a substrate, aligning a component with the substrate such that at least one lead of the component is juxtaposed with the conductive adhesive, performing a partial cure of the conductive adhesive, testing performance of the component, and performing a full cure of the conductive adhesive. Another method includes the additional steps of applying a tacky film to the substrate and juxtaposing the component with the tacky film. When the testing in either embodiment shows a defective or misaligned component, the component may be replaced or repositioned by cold separation of the at least one component lead from the partially cured conductive adhesive. Optionally, additional conductive adhesive may be applied, when needed, before replacement or repositioning of a component. A composition for mounting a component on a circuit board includes a conductive adhesive screened on a contact pad, the conductive adhesive being partially cured, wherein the composition allows cold separation of the component from the substrate and may be fully cured by heat exposure. An apparatus is also provided including a component, a substrate, and a means for temporarily mounting and electrically connecting the component on the substrate.

Method and composition for mounting an electronic component and device formed therewith

Rework and underfill nozzle for electronic components

A method and apparatus for desoldering electronic components from a substrate. A vacuum is used to enhance the flow of a hot gas under an electronic component to reflow the solder connections attaching the electronic component to a substrate. Water vapor is added to the hot gas to increase the heat capacity of the hot gas. A system for periodically changing the direction of flow of the hot gas and vacuum under the electronic component is used to uniformly heat the solder connections. A method and apparatus for depositing underfill material between an electronic component and the substrate on which the electronic component is mounted. A vacuum is applied to enhance the flow of underfill material into the space between the electronic component and the substrate.

A method for attaching an electronic device to and removing an electronic device from a substrate includes verifying a position of a pick-up and vacuum head relative to the electronic device prior to contacting the electronic device with the pick-up and vacuum head; contacting the electronic device with a device for conductively applying heat to the electronic device and picking up the electronic device; and heating solder for attaching the electronic device to the substrate to a reflow temperature of the solder by applying heat to the device for conductively applying heat.

Method and apparatus for micro BGA removal and reattach

A solder interconnection between a module and printed circuit board or card is provided by a plurality of solder connections arranged in a micro grid array joining solder wettable pads on a major surface of the module to a corresponding set of solder wettable pads of the printed circuit board or card. The solder connections are column shaped with the height of each connection being at least about 1.4 times the diameter of the connection.

Micro grid array solder interconnection structure with solder columns for second level packaging joining a module and printed circuit board

Micro grid array solder interconnection structure for second level packaging joining a module and a printed circuit board

An apparatus for attaching an electronic device to and removing an electronic device from a substrate. An electronic device pick-up and vacuum head applies a vacuum source to the electronic device for engaging, picking up and retaining the electronic device. The heat is transmitted by conduction through the structure of the device pick-up and vacuum head to the electronic device and solder for securing the electronic device on the substrate to heat the solder to its reflow temperature. The pick-up and vacuum head includes an electronic device engaging portion, a vacuum port, and a heat source engaging portion.

Method and apparatus for &mgr;BGA removal and reattach

Micro grid array solder interconnection structure for second level

A pickup head adapted to pick up an electronic component from a supply source, support the component during transport from the supply source to a substrate, and position the electronic component at a site on the substrate has a means for heating the electronic component during pickup, transport and positioning the chip, to a temperature sufficient to effect solder reflow when the electronic component is placed on the substrate. The pickup head, and method of using the head, effectively reduce the problems associated heretofore with solder reflow attachment of individual components by reducing the number of process steps, faster attachment cycle times, and reduced manufacturing costs.

Growing community of inventors

Charlotte, NC, United States of America

Kris Allan Slesinger