International Business Machines Corporation

Christopher G Angulas

Thomas E Kindl

Patrick T Flynn

Joseph Funari

Randy L Orr

Joseph Maryan Milewski

Frank E Andros

Orr Randy L

A flexible circuit member including a circuitized substrate of a dielectric material having a plurality of apertures therein. Located within and/or bridging selected ones of the apertures are electrical conductors, the conductors having a solder member secured thereto. A frame is also used, the circuitized substrate being secured thereto.

Flexible circuit member

An electronic package and method of making same wherein a flexible circuitized substrate is used to interconnect contact sites on a semiconductor device (chip) to respective conductors on a circuitized substrate (PCB). Significantly, the flexible substrate is coupled to the PCB using solder elements which are applied to the flexible substrate prior to semiconductor device coupling to others of the flexible substrates' conductive elements. These other conductive elements are then connected to the devices' contact sites using thermocompression bonding, the bonding occurring through an aperture in the flexible substrate.

Electronic package structure and method of making same

An electronic package and method of making same wherein the package includes a first substrate (e.g., printed circuit board), a second, flexible circuitized substrate (e.g., polyimide dielectric with conductors thereon) having a semiconductor device (chip) electrically coupled thereto. The outer portions of the flexible circuitized substrate are wrapped about the frame which in turn includes portions thereof which serve to spacedly position the wrapped flexible substrate with respect to the first substrate such that conductors on both substrates may be precisely aligned and electrically coupled in a permanent manner. A method of assembling the invention, including the use of a vacuum head and appropriate heat thermodes, is also defined.

Electronic package and method of making same

A method of bonding a flexible circuitized substrate to a circuitized substrate (e.g., printed circuit board) to interconnect selected circuitry of both substrates using solder. Solder paste is applied over conductive pads on the circuitized substrate and organic dewetting material (e.g., epoxy coating) adjacent thereto. The flexible substrate, having conductors located within and/or traversing an aperture in the flexible substrate's dielectric, is positioned above the solder paste and heat is applied (e.g., in an oven). The paste, dewetting from the organic material, 'balls up' and substantially surrounds a solder member (ball) attached to a bridging portion of the flexible substrate's conductor, thereby connecting both substrates. A frame member may be used to align the flexible substrate, both during solder member attachment thereto, as well as for aligning the flexible substrate having solder members attached, to the respective solder paste locations on the lower substrate.

Method for bonding flexible circuit to circuitized substrate to provide

Method of bonding flexible circuit to cicuitized substrate to provide

A method of bonding a flexible circuitized substrate to a circuitized substrate (e.g., printed circuit board) to interconnect selected circuitry of both substrates using solder. Solder paste is applied over conductive pads on the circuitized substrate and organic dewetting material (e.g., epoxy coating) adjacent thereto. The flexible substrate, having conductors located within and/or traversing an aperture in the flexible substrate's dielectric, is positioned above the solder paste and heat is applied (e.g., in an oven). The paste, dewetting from the organic material, forms a substantially spherical ball and connects to the flexible circuit's conductor, connecting the two. In an alternative embodiment, the solder ball is formed to its desired shape and cooled (to solidification), separate from the flexible circuitized substrate. The flexible substrate is then lowered until the conductor engages the solder ball's upper surface. Heat is then applied to bond solder and conductor.

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Endicott, NY, United States of America

Christopher G Angulas