摘要:
Disclosed are heat management method, and system, and computer program product that include at least one optical strain gauge that is mounted on a printed board in proximity to an object being monitored for temperature changes. Power for controlling heat to the object is modified in response to changes in the optical reference signal of the gauge, whereby such changes are correlated to the rate of strain change in the object as measured relative to predefined temperature changes of the object being monitored.
摘要:
Disclosed are enhanced methods and elastomeric compression structures utilizing embedded gas-filled gas-filled polymeric microspheres that are expanded in predefined conditions that are usable in electrical components for reducing stress relaxation.
摘要:
A reflow heating system includes a housing assembly defining an internal thermal processing chamber that encapsulates at least a microelectronic assembly on a substrate. A first heating source is coupled to the housing assembly and within the thermal processing chamber. The first heating source is biased by a force-applying assembly into engagement with the microelectronic assembly. The first heating source comprises one or more heating platens adapted to engage the microelectronic assembly for applying direct heat sufficient to melt solder. A vacuum assembly is incorporated in the heating platen for allowing application of at least a partial vacuum to the microelectronic assembly to permit withdrawal thereof from the substrate. A radiant heating source is applied beneath the substrate and a directional heating source is applied to the microelectronic assembly.
摘要:
A novel Land Grid Array (LGA) interposer with adhesive-retained contacts and method of manufacture provide improved reliability in LGA mounting applications. A flexible adhesive is used to secure LGA interposer contacts to the walls of voids through an interposer frame. The contacts may be spring contacts or “fuzz button” type contacts. The use of a flexible adhesive provides for floating movement of the contacts within the voids so that thermal expansion stresses do not cause unbalanced compression of the contacts that could otherwise occur with a fixed attachment of the contacts to the frame. The resulting interposer can provide reliable electrical connection from LGA lands on an integrated circuit package to lands on an electronic assembly that is highly tolerant of thermal expansion differences, while eliminating migration of the contacts out of the voids that could otherwise cause shorting or disconnection.
摘要:
An electrical connector includes contact pads on a printed circuit board and contact members on a substrate. The contact members are pressed against the contact pads by a compression mat having compressor fingers. A clamping arrangement forces the compressor fingers against the substrate and thereby presses the contact members against the connector pads. The compression mat is made of elastomeric material, which has a tendency to relax and thus reduce the pressure after the clamping arrangement is tightened. A restrainer member is used to offset this tendency of the polymer to relax. The restrainer member has holes through which the compressor fingers of the compression mat extend.
摘要:
A heat exchanger for use, e.g., in a rear door of a server rack in a computer room, made up of pipes clad with a layer of a phase change material, such as a paraffin, so that latent heat is absorbed in the conversion from the solid to the liquid state. Preferably, each pipe in turn is opened by a control valve and chilled coolant flows through the pipe until the phase change material reverts back to the solid state. Then, the control valve is again closed, and the phase change material is further heated by waste heat so that it is melted once more. Preferably, the control valve for only one pipe at a time is opened, so that latent heat is being absorbed by the phase change material around all pipes but one.
摘要:
A heat exchanger for use, e.g., in a rear door of a server rack in a computer room, made up of pipes clad with a layer of a phase change material, such as a paraffin, so that latent heat is absorbed in the conversion from the solid to the liquid state. Preferably, each pipe in turn is opened by a control valve and chilled coolant flows through the pipe until the phase change material reverts back to the solid state. Then, the control valve is again closed, and the phase change material is further heated by waste heat so that it is melted once more. Preferably, the control valve for only one pipe at a time is opened, so that latent heat is being absorbed by the phase change material around all pipes but one.