Abstract: The present invention is aimed at a provision of a connector for high speed transmission, in which no or little cross-talk occurs and irregularity of a propagation delay is improved. The connector includes a plurality of ground contacts having a generally L-shaped cross section, and arranged in a regular parallel arrangement. The whole sectional shape of the connector is in the form of a grid. The connector also includes a plurality of contacts for signal transmission, that are located within the grid, so that the signal transmission contacts are substantially surrounded by ground contacts.

Abstract: A projection system is described which efficiently combines the output from multiple lamps, images of which are focused to a common point. The projected screen brightness is multiplied over that of a conventional single lamp of equivalent wattage. The screen brightness can be increased or diminished by switching individual lamps on or off, adjusting the light level for conventional overhead transparencies, or low transmission liquid crystal display projection panels.

Abstract: A test socket for temporary connection of a ball grid array integrated circuit device to a test circuit includes an array of contacts each including two cantilever arms biased toward each other and terminating in tips adapted to capture one ball of the device.

Abstract: A method for electrical interconnection of a first metallic pattern deposited on a dielectric film to a second metallic pattern, comprising the steps of forming on one side, of the dielectric film opposite the side where the first metallic pattern is deposited, grooves sufficiently deep to reach the first metallic pattern, preparing the second metallic pattern having such a thickness that it is fitted into the grooves formed in the dielectric film and can be in contact with the first metallic patterns, and fitting into the grooves formed in the dielectric film the second metallic patterns to join the metallic patterns to each other under pressure.

Abstract: Protective, sealing cover made of flexible material for easy application over an exposed end of a cut reinforcing bar. The cover contains a water impermeable sealant which surrounds the end of the cut bar during the process of applying the cover. A dual function tool facilitates the process of cover application by first positioning the cover then setting a locking means to secure the cover to the bar.

Abstract: A temporary package used to test and burn-in a bare die that will fit in a board mounted socket. The package comprises a base having contacts to engage the die and provide contact to the outer periphery, a lid for pressing the die into electrical contact and a protective cover to restrict the die from damage due to external pressures to the sides or top of the package. The die, lid and protective cover can be assembled onto the base and removed by automated equipment.

Abstract: A contact retention module for a test socket includes mating gear-like teeth formed of alternating projections and valleys. The projections of one module half close the valleys of another module half to produce pockets which retain and guide contact terminal ends within the pockets.

Abstract: An overhead projector includes an opening in its bottom to accommodate a pivoting mirror. This opening is closed by two doors which pivot to support the projector in use. The projector includes latches which retain the doors in the closed position and gravity cams which retain the doors in the open position, but which automatically release the doors when the projector is placed on its side.

Abstract: A cable assembly includes a number of insulated wires removably attached to a tearable backing. This construction allows the simultaneous termination of the wires since they are held in position for mass termination equipment and permits the free flow of air around and between the wires, in addition to ease of routing the wires, once the backing has been removed after termination of the wires.

Abstract: The use of two identical clips designed for use in holding stacks of JEDEC type trays for electronic devices in a manner to protect the devices comprises a platform supporting rails engagable with the end tabs on the trays to support the trays and the clips. A latch is provided to hold the clip in place and a handle is provided to grasp the stack of trays.

Abstract: A safety interlock for an overhead projector utilizes only one electrical switch to provide the functions of both a conventional power switch and a safety interlock switch. In an operational mode, the switch responds to a cam surface for actuation. In a safety interlock mode, the switch is allowed to rotate in response to forces generated by the cam surface rather than being actuated.

Abstract: A cover assembly includes an expanded elastomeric tube supported in the expanded state by an internal frangible support core. The support core possesses sufficient strength to resist contraction of the tube but will break upon the addition of relatively little additional external force. Breakage of the core allows the tube to contract and securely cover and seal to the object to which the cover assembly is applied.

Abstract: A sealing member inside the bag and a withdrawing member outside the bag can be interplugged and cooperate by complimentary conical sealing surfaces to dispense flowable material from the bag. A retaining member is attached to the outer side of the bag wall and clamps a portion of the bag wall between the retaining member and the sealing member to allow a plastic deformation of that portion by the withdrawing member until it ruptures.

Abstract: A mounting for the projection head of an overhead projector allows the head to pivot through an arc of 90.degree. between a position for operation and a position for transportation. A position lock secures the projection head in either of the two positions.

Abstract: A connector includes a jack and a plug having corresponding staggered contacts formed by alternating projections and recesses which permits the connector to have a higher contact density than conventional connectors.

Abstract: An electrical connector includes a male plug having preferably two tapered major surfaces and a female receptacle having walls corresponding in taper to the major surfaces of the male plug. The male plug is adapted to terminate a ribbon cable and may be formed by a tapered circuit board or a tapered form around which conductors of a ribbon cable are bent. The female receptacle is lined with a flexible circuit for contact to the male plug and connection to a circuit board.

Abstract: A burn-in socket for land grid array devices or ball grid array devices includes a receptacle having an array of terminals for accepting and contacting the device and an outer shell which is actuated by rotation of the shell to capture the device and provide a force to ensure electrical contact between the device and the terminals.

Abstract: A permanent marking article for use with an elongate object, consisting of a strip of transparent polymeric film having an upper and a lower surface, at least a portion of the upper surface being imprintable, the polymeric film being fusible to itself with the passage of time, and remaining transparent even after fusion such that any marking placed on any portion of the article remains readable even if covered by one or more overwrapping portions of the strip.

Abstract: A high impedance cable includes a first layer of insulation surrounding a series of conductors to form a conventional ribbon cable and a second layer of insulation which conforms to the first layer of insulation and is retained in contact with the first layer of insulation in a manner which substantially excludes air from between the two layers of insulation but permits the second layer of insulation to be stripped from the ribbon cable for convention mass termination of the ribbon cable.

Abstract: A wire gripping entryway particularly adapted for use with an electrical connector capable of making an electrical connection to a cylindrical, insulated electrical wire inserted into the connector includes a wall having an inner surface defining an hole in the connector for the entrance of the electrical wire, a first set of resilient projections extending a first distance radially inwardly from the inner surface of the wall for gripping a wire having a diameter within a first range of diameters and a second set of resilient projections extending a second distance greater than the first distance radially inwardly from the inner surface of the wall for gripping a wire having a diameter within a second range of diameters.