摘要:
A method 10, 90 for making a multi-layer electronic circuit board 82, 168 including the steps of forming at least one protuberance 15, 100 upon an electrically conductive member 12, 92 and adding additional electrically conductive layers of material 34, 56, 58, 104, 114, 138, 140 to the member 12, 92 while selectively extending the protuberance 15, 100 within the layers 82, 168, thereby forming a circuit board 82, 168. A portion of the formed circuit board may be etched in order to selectively create air-bridges 86 or interconnection portions 164.
摘要:
A method 10 for making a multi-layer circuit board 70 having at least one electrically conductive interconnection portion or “via” 72 which extends within the board 70 and at least one air-bridge 74. The method 10 includes the steps of forming protuberances 13 upon a core member 12, attaching pre-circuit assemblies 32, 34 to the core member 12, thereby forming the circuit board 70 while concomitantly and selectively extending at least one of the protuberances 13 within the formed circuit board 70.
摘要:
A method for forming sets of tri-metal material involving the use of cladding mills. When multiple sets of tri-metal material are formed, the outside surfaces of each set is prepared by oxidation to prevent each set from adhering to the set above or below. An alternative to oxidation is to provide a removable layer on the outside surface of the tri-metal material. Alternatively bonding materials may be used on the intermediate surfaces; such bonding materials can be selected from a group consisting of tin, nickel, titanium, chromium, silver and zinc.
摘要:
A center console for a motor vehicle comprising a stationary housing mounted within the vehicle. The housing includes an open center defined between opposing ends and has a console body mounted within the open center of the housing. The console body is rotatable about a longitudinal axis running through the console body and is mounted such that an operator may remove the body from the frame. Also, at least two longitudinal side walls of the rotating body are visible within the open center and the console body may be rotated such that alternate side walls may be positioned in an uppermost position with respect to the center console. Thus, a user may exchange the console body for another and access multiple sides of the console body, regardless of which is in the uppermost position.
摘要:
A method and article for attaching an electronic component, such as a semiconductor die, to a substrate includes applying a relatively low-melting-temperature solder preform to the substrate; and applying a bead of a curable bonding material to the substrate around the periphery of the solder preform in an amount sufficient to substantially contain the solder material and bridge the gap between the die and the substrate upon a subsequent collapse of the solder preform along its thickness dimension. After placing the die atop the solder preform so as to at least partially overlie the bonding material, the method includes heating the solder preform and the bonding material so as to reflow the solder, whereupon the solder preform collapses to allow the bonding material to engage the underside of the die, and to subsequently cure the bonding material.
摘要:
Solder compositions (by weight percent) (1) comprising between 37-53% tin, 37-57% bismuth, and 6-10% indium and having a melting temperature between 99.degree.-124.degree. C., and (2) comprising between 48-58% tin, 40-50% bismuth, and 2-5% indium and having a melting temperature between 125-157.
摘要:
In conventional ETM circuit structures a pin connector in which the pin is etched from the ETM substrate and the mating cavity is etched from the ETM substrate to be mated. The connector utilizes the subtractive ETM structure processing to define any one of several pin-cavity configurations. The pin serves as an anchor with the metallurgical bonds with solder in the cavity that forms on the copper surfaces of the ETM circuit structure to give good mechanical strength to the connection. In particular four different configurations of interconnections are shown and described.
摘要:
A circuit component secured to a printed circuit board typically uses fine wires for completing the circuit from the printed circuit to the component. The component may be an integrated circuit having one or more pads thereon for receiving the wire. A device and method for making the device has the printed circuit formed on the PCB with one or more wire traces that are etched away from the printed circuit. The etchant removes a portion of the bottom layer and sometimes the middle layer of an etched tri-metal along with any lamination and adhesive. This forms a free end of the wire trace that is bonded to the component. Additional wires are not required.
摘要:
A method of manufacturing a lead-free electrical solder paste having primary solder powder and an additive metal powder component that does not melt during the soldering process. Metal powders may be either elemental metal or a metal alloy. The primary powder is the same as is used in conventional solder paste. The additive powder has a melting point substantially higher than the melting point of the primary powder. The primary powder comprises between 80-99% Sn and 1-20% Ag. The additive powder metal is selected from the metal group comprising Sn, Ni, Cu, Ag, and Bi and mixtures thereof.