Abstract:
An electronic board assembly carrying connectors on each side of its lower edge which is adapted to withstand the relatively strong forces required to insert or remove the assembly, e.g., from a backplane board, and yet provide many electrical contacts along the interconnection sites. The electronic board assembly comprises two symmetrical elementary PCBs electrically coupled together, each carrying a connector on its external lower edge. In one embodiment, these two PCBs are coupled together by a flexible adhesive insulative layer and maintained by mechanical devices such that the distance between these two connectors is set to a predetermined distance (to align precisely with the backplane board). The mechanical device used to maintain a predetermined distance between the two connectors of the assembly may comprise a U-shaped member, the upper part of this member being strategically inserted between these connectors. Electrical communication between these PCBs is accomplished using conductive vias or parts, within the adhesive insulative layer.
Abstract:
A method for manufacturing a SIL hybrid circuit is presented. A lead frame is provided which includes side bands and clip members between the side bands configured to connectively receive a hybrid circuit. The lead frame further includes foot members between the side bands configured to be surface-mounted to a base substrate. Each foot member has tabs at the ends thereof and support members extending straight from the tabs to connect the tabs to the side bands. Corresponding contact areas of the hybrid circuit are attached to the clip members. At least one foot member and associated support members are selected to remain in the lead frame to support the SIL hybrid circuit during positioning on the base substrate and surface mounting thereto. Excess parts are removed from the lead frame based on the selecting. As such, SIL hybrid circuits may be efficiently used to achieve high packaging densities.
Abstract:
A memory module capable of changing the generation of semiconductor memory devices by changing the design of a unit board without changing the design of a mother board.The mother board has connection terminals having an ability of connecting with first and second generation type unit boards, so that even when a connection terminal location is changed as a result of the generation change of the semiconductor memory devices, the next unit board can be connected to the mother board by selecting an appropriate terminal from connection terminals on the mother board.
Abstract:
An electronic stack module is disclosed comprising two or more substrates having upper and lower surfaces with one or more electronic components disposed on the surfaces and electrically connected to connector pads disposed in a predetermined pattern at the substrate edges. A plurality of clip leads are electrically attached to the connector pads, where each clip lead comprises a clip section, a standoff section of specified length, and a mounting section, the clip section configured to frictionally engage both upper and lower substrate surfaces. Stacking of substrates is accomplished by aligning and bonding clip sections of one substrate to corresponding mating sections of the adjacent substrate.
Abstract:
A solder-bearing lead, and methods of fabricating and using it, where the lead is formed with a solder-retaining portion having a cross-sectional profile with undercuts and a tip, preferably in a V-shape, where solder surrounds said solder-retaining portion and undercuts, and extends outwardly substantially no farther than said tip.
Abstract:
A clip lead is provided for soldering to and supporting a first substrate vertically on a second substrate which may be horizontal. The terminal end of the clip is configured to form a stable support for the substrate during soldering in a vertical position to the second substrate by being bent at right angles to and extending under the first substrate.
Abstract:
A solder-bearing lead adapted to be soldered to a conductive surface comprising an elongated body portion having a solder- bearing portion, a terminal portion, and a middle portion disposed between said solder-bearing portion and said terminal portion. The solder-bearing portion carries a solder mass either on a pair of projections extending from one edge of said body portion and forming a gap therebetween dimensioned to receive a solder mass, or on the opposed faces of said solderbearing portion. A region of the middle portion is twisted so that the solder-bearing portion lies in a plane substantially perpendicular to the plane of the terminal portion. The solder-bearing lead can be used as an edge clip for mounting a substrate such as a printed circuit board, or as a surfacemounted lead for a substrate.
Abstract:
A solder-bearing lead for attachment to the surface of a substrate, wherein a discrete mass of solder is mechanically held firmly by the lead in a position permitting close proximity to the substrate surface to connect the lead to the substrate with an electrical and mechanical bond upon melting of the solder, the lead body having a pair of fingers partially encircling the solder mass with a gap between the fingers providing an unobstructed flow for the melted solder to the substrate. The lead may also be used to interconnect a first substrate to a second substrate, forming a bond between conductive areas on both substrates.
Abstract:
An electrooptical cell has electrical connection means between electrodes and a control unit which comprise a contact block of a synthetic adhesive material having conducting particles applied on the edge of each plate in contact zones which are provided flush with said edge, the contact block constituting both the electrical connection and the mechanical bond with at least one other element of said connection.
Abstract:
A solder-bearing lead adapted to be soldered to a conductive surface comprising an elongated body portion having a solder-bearing portion, a terminal portion, and a middle portion disposed between said solder-bearing portion and said terminal portion. The solder-bearing portion includes a pair of projections extending from one edge of said body portion and forming a gap therebetween dimensioned to receive a solder mass. A region of the middle portion is twisted so that the projections lie in a plane substantially perpendicular to the plane of the terminal portion. The solder-bearing lead can be used as an edge clip for mounting a substrate such as a printed circuit board/or as a surface-mounted lead for a substrate.