Abstract:
A multi-chip module includes bare IC chips mounted on respective areas of a printed wiring board. Outer electrode pads on the peripheries of the board are soldered to another printed wiring board such as a motherboard. Lead pads and the outer electrode pads are interconnected through a circuit pattern, through holes, and interstitial via holes. The circuit pattern is disposed on a die bonding surface of the bare IC chips for which insulation is not necessary.
Abstract:
In the electronic device of the present invention, leg portions of a frame are projected downward from the underside of a printed circuit board, so the positioning of the electronic device can be done by inserting the leg portions into holes formed in a mother printed circuit board. Thus, when the electronic device is surface-mounted to the mother board, there is no fear of its dislocation even under vibration or shock. Accordingly, the electronic device is not deteriorated at all in its quality.
Abstract:
A filter assembly includes a printed circuit board having a filtering circuit and a ground plane. A body receives the printed circuit board. The printed circuit board has at least one tab, and the body has a respective slot for receiving each tab, aligning the printed circuit board with the body. The body is shaped so as to provide a first cable connector at one end. The ground plane of the printed circuit board is connected to an inner wall of the body by solder. A nut fits on an end of the body opposite the cable connector of the body. The nut provides a second cable connector at an end opposite the first cable connector. The nut is connected to the body by solder along a periphery of the nut to form a water tight seal. The solder joining the nut to the body is continuous with the solder connecting the ground plane to the body. A pair of terminals are electrically connected at opposite ends of the printed circuit board. Each of the terminals has a slot sized to receive a respective end of the printed circuit board and may form a friction fit between the printed circuit board and the terminals.
Abstract:
A ceramic substrate having two side surfaces in a lengthwise direction and two side surfaces in a widthwise direction intersecting each other. The ceramic substrate also includes at least one flat surface in a thicknesswise direction. Internal electrode films are embedded in the ceramic substrate with film surfaces thereof extending roughly parallel to the flat surface of the ceramic substrate. External electrodes are each provided on the flat surface of the ceramic substrate toward one of the two ends of the ceramic substrate in the lengthwise direction, are electrically continuous with the internal electrode films and are formed over distances and from the two side surfaces in the widthwise direction.
Abstract:
A method for manufacturing substrate elements includes providing a mother substrate, forming at least one elongated through-hole on the mother substrate such that an entire longitudinal end surface of the first substrate element and a portion of a lateral surface of the second substrate element are exposed, forming an electrode pattern on the inner surface of the at least one elongated through-hole, and cutting the mother substrate along lines extending in the vicinity of the longitudinal ends of the at least one elongated through-hole and in a direction that is substantially perpendicular to the longitudinal axis of the elongated through-hole.
Abstract:
A method and apparatus for soldering wires of components on PC boards to a lead frame. Wires from the electronic components on a PC board supported by a fixture are led through respective pathways and particularly plated grooves on each side of the PC board. The wires within the pathways are held there by being adhered to a temporary fixture beneath the board until the wires are later affixed in their grooves by dipping the sides of the PC board in a solder pool. The excess wire tails are cut away. The PC board is then mounted on a lead frame, and the leads of the lead frame are aligned with respective pathways of the PC board. The PC board and lead frame are then dipped in solder which electrically connects the wires in their respective pathways to the leads of the lead frame.
Abstract:
Bare IC chips (201 through 203) are mounted on respective areas (101 through 103) of a printed wiring board (100). The outer electrode pads (105) on the peripheries of the board (100) are soldered to another printed wiring board (1) such as a mother board. Lead pads (107) and the outer electrode pads (105) are interconnected through a circuit pattern (109), through holes (111) and interstitial via holes (112). The circuit pattern (109) is disposed on a die bonding surface of the bare IC chips (201 and 202) for which insulation is not necessary. A multi-chip module is thus completed.
Abstract:
A connector assembly used for balanced transmission includes a jack connector and a card-edge plug connector. The jack connector includes a plurality of pairs of jack-type signal contact elements arranged parallel to each other in an array, a plurality of jack-type ground plate elements arranged alternately with said plurality of pairs of jack-type signal contact elements in said array, a jack-type insulating body made of an electrically insulating material and jack-type ground contact element. The card-edge plug connector includes a plurality of pairs of plug-type signal pads, a plurality of slits arranged alternately with said plurality of pairs of plug-type signal pads, at least one plug-type ground layer and a plurality of signal patterns each extending from a respective one of said plug-type signal pads. The connector assembly has a strip-line structure. Also, virtual ground planes are created at a region between each pair of the plurality of pairs of plug-type signal pads.
Abstract:
An oscillator includes a multi-layered base. Circuit patterns are formed on a first main surface and the inside of the multi-layered base. Holes through which wiring patterns of the individual layers of the base are connected are formed within the multi-layered base. Electronic components are mounted on the first main surface of the multi-layered base. First and second reverse electrodes, which serve as external terminals to be connected to an external source, are formed on a second main surface of the multi-layered base. The first reverse electrode serves as a ground electrode, and the second reverse electrodes serve as terminal electrodes. The reverse electrodes are electrically connected to the circuit patterns via the holes. The reverse electrodes are located farther inward than the lateral surfaces of the multi-layered base. A shield cover is placed to tightly cover the first main surface of the multi-layered base. It is thus possible to provide a miniaturized, less expensive, and easy-to-mount oscillator module in which unwanted radiation characteristics are improved.
Abstract:
The present invention relates to the interconnection of two electronic devices (2 and 3) by means of an interconnection device (1).According to the invention, the interconnection device (1) has metallized grooves (17, 18) in its edge, each in electrical connection with one of its lower contacts (15). Portions of solder (20), partially accommodated in the grooves (17, 18), fasten the interconnection device (1) on the electronic device (3) and make the electrical connections between the devices (1 and 3).