Abstract:
A flexible circuit (100) includes a first circuit path portion (110) and a second rigid circuit path portion (140) to which electronic components (102) may be coupled. Each circuit path portion (110 and 140) including a resin layer (112 and 142) and an adjacent conductive layer (114 and 144). Each circuit path portion (110 and 140) defining a gap (120 and 150) substantially running along a line corresponding to a desired bend location. A central circuit path portion (130) is disposed between the first circuit path portion (110) and the second rigid circuit path portion (140) and includes a first conductive layer (134) in electrical communication with the first circuit path portion (110) and a second conductive layer (136) in electrical communication with the second rigid circuit path portion (140), so as to provide electrical communication across the gaps (120 and 150). A metal plate (160) is disposed adjacent the second rigid circuit path portion (140).
Abstract:
A method for forming a plurality of solder bumps on an electronic component substrate utilizes a transfer plate to electrodeposit solder deposits and subsequently reflow the deposits onto the substrate. The plate comprises discrete pad electrodes formed of a ceramic material that is suitably electrically conductive to permit electroplating of the solder alloy, but is not wet by the molten solder to permit reflow onto the substrate. A preferred electrode material is an indium oxide compound. The solder deposits are plated onto the electrodes, and the transfer plate is superposed on the substrate such that the bumps rest upon bond pads on the substrate. The assembly is heated and cooled to melt and resolidify the solder alloy, whereupon the solder bonds to the substrate pads to form the bumps.
Abstract:
Improvements are disclosed in a machine for applying carrier stock of resilient polymeric material to substantially identical containers, each having an upper rim of a given diameter and a side wall of a larger diameter. The carrier stock has container-receiving apertures in longitudinal rows. A conveyor conveys the containers in longitudinal rows. A wheel assembly comprising two wheels with paired jaws receives the stock, stretches the stock transversely, and moves the stock downwardly past the rims. The conveyor, the wheel assembly, and the jaws on one wheel are adjustable for applying the stock selectively in a rim-applied carrier position or in a side-applied carrier position. The conveyor is supported by a table and is adjustable vertically, via spacers insertable between the table and a base. The wheel assembly is adjustable longitudinally, via rollers on longitudinal rails. The jaws on one wheel are adjustable transversely, via screws.
Abstract:
An integrated circuit component is attached to a printed circuit board by solder bump interconnections that are formed between metal bumps on the component and a metal-plated terminal on the board. The metal plate overlies both a bond pad and an adjacent runner of each terminal and is formed of a first metal, which is preferably a tin-base alloy. The metal bumps on the component are formed of a second metal, which is preferably an indium-base alloy. The component and board are assembled and heated to a temperature less than the melting temperatures of the first and second metals. At the interface between the bumps and the plate, the first and second metals cooperate to form a liquid phase which, upon cooling and solidifying, completes the interconnection.
Abstract:
An article stack unifying device having article stacking elements is provided to stack a plurality of articles on a surface on or of a rotatable surface. While the articles are being stacked on the selected surface a quantity of wrapping film is wrapped around the stack of articles at intervals during the stacking process and at the completion of the stack.
Abstract:
This process uses a metal lift-off step and results in a layer of polyimide covering the surface of an integrated circuit, except at the bonding pads which are covered by metals. A layer of polyimide is applied to the surface of an integrated circuit and then partially cured. A layer of positive photo-resist is applied over the polyimide layer and then pattern exposed and developed, resulting in windows being opened up over the bonding pads of the integrated circuit. The remaining photo-resist is then flood exposed. One or more metals are then sputtered over the resist and the bonding pads. The integrated circuit is then immersed in solvent and the remaining layer of photo-resist, including the metal above it, is lifted-off. Only the metal over the bonding pads remains. The polyimide layer is then fully cured.
Abstract:
A machine for packaging multiple containers wherein a flexible carrier stock is fed across a jaw drum. A plurality of containers are also moved through the machine whereby the carrier is subsequently positioned over the plurality of containers so that flexible carrier stock engages with one of the containers to form a package. The jaw drum and/or a connected feed drum are preferably adjustable to accommodate a range of container sizes and carrier configurations.
Abstract:
A method for forming a solder-bumped terminal on a planar dielectric substrate utilizes a terminal of a particular configuration and comprises depositing onto the terminal a thin plate of solder alloy and reflowing the solder alloy to form a bump. The terminal configuration includes an enlarged terminal pad connected to a relatively narrow linear runner section. Preferably, the runner section width is between about 50 and 150 microns, whereas the pad width is between about 1.2 and 2.0 times the runner section width. The terminal is initially fabricated to include a metal layer adjacent the substrate formed, for example, of copper and a thin, outer plate composed of the solder alloy. The solder plate is deposited in a uniform thickness to both the terminal pad and the adjacent runner section. The terminal is then heated to melt the solder plate, whereupon the molten solder is drawn from the runner onto the enlarged pad to form a bump. In a preferred embodiment, a solder plate between about 10 and 25 microns is electrodeposited onto the terminal and reflowed to form a bump having a height between 60 and 80 microns.
Abstract:
A solder bump stretch device is disclosed for use in mounting an electronic component to a substrate by a plurality of solder bump interconnections that are produced by reflowing preformed solder bumps carried on the component. the device is fastened to the component, which is in turn assembled with the substrate so that the bumps rest upon the substrate in preparation for solder reflow operations. The device comprises a flexible web that overlies the component outer face and is connected to legs that depend about the component. Prior to solder reflow, the web is held by an expendable spacer in a biased position wherein the legs are raised apart from the substrate. During heating to melt the solder bumps, the spacer is expended, releasing the web, whereupon the legs engage the substrte to lift the component relative to the substrate and thereby stretch the molten solder to form elongated interconnections preferably having hourglass configurations.
Abstract:
A machine for packaging multiple containers wherein a flexible carrier stock is fed across a jaw drum. A plurality of containers are also moved through the machine whereby the carrier is subsequently positioned over the plurality of containers so that flexible carrier stock engages with one of the containers to form a package. The jaw drum and/or a connected feed drum are preferably adjustable to accommodate a range of container sizes and carrier configurations.