Abstract:
In order to provide protection against disruptive radiation and achieve good conduction of heat, a housing for control devices which has multiple parts is provided with a printed circuit board carrying power components and control elements with a peripherally extending lining of electrically and thermally conducting material. The printed circuit board is clamped between the housing halves in the region of the linings. The power components are contacted by the lining so as to be thermally conducting, while control elements which give off intensive disruptive radiation or are sensitive to such radiation are enclosed within connecting pieces projecting from the walls of the housing parts.
Abstract:
A retainer for removable components that plug into a printed circuit board retains the removable component in an associated sockets on a printed circuit board. The retainer has the form of a clip including a retaining surface that applies a retaining force to the component. The retaining force is largely a spring force that directs the leads into the associated sockets by applying pressure to the top of the component. The retainer further has a positioning surface that positions the retaining surface in association with the component. This is done by the positioning surface engaging the exposed exterior surface of the associated sockets. A connecting surface connects the retaining surface to the positioning surface around the circuit board. In the preferred embodiment, the component is a crystal oscillator that plugs into the printed circuit board. Such crystal oscillators are removable to permit changing the operating frequency of an associated microwave transmission circuit.
Abstract:
Radio frequency emissions within a computer system having a printed circuit assembly in proximity of a metal surface are reduced by the placement of one or more lossy components electrically connected to a metal plane within the printed circuit assembly. A connector electrically connects the lossy components to the metal surface. In one embodiment, the lossy components include two resistors at opposite ends of an edge of the printed circuit assembly that is closest to the metal surface. In an alternate embodiment, a single lossy component is a resistor placed in the middle of an edge of the printed circuit assembly that is closest to the metal surface. In the alternate embodiment, a second connector at a first end of the edge of the printed circuit assembly that is closest to the metal surface directly connects the metal plane to the metal surface, and a third connector at a second end of the edge of the printed circuit assembly that is closest to the metal surface directly connects the metal plane to the metal surface. A spring is used to connect the printed circuit assembly to the metal surface. Ends of the spring are inserted into vias within the printed circuit assembly. Traces on the printed circuit assembly electrically connect the vias to the lossy component. Similarly, the vias may be directly connected to a ground or power plane without an intervening lossy component.
Abstract:
A connector (10) having one or more arrays of elongate arms (22) of contacts (20) having contact sections (26) on free ends (24) thereof to be soldered to respective traces (94) of a circuit element (90), facilitated by securing a soldering component (40) to free ends (24). Component (40) includes a block member (42) along the outer surface of which is secured a lead frame (60) which includes a corresponding plurality of fingers (66) extending transversely from an elongate body section (62). Block (42) is of thermally insulative material having solder resistive surfaces. On the finger ends (68) are affixed preforms (88) of solder; on body section (62) is defined a thin magnetic layer, transforming the brass carrier strip into a Curie point heater. When the body section is subjected to RF current, it generates thermal energy which melts the solder preforms to join the fingers first to the contact sections (26) of the connector contacts (20), and at a remote site later subjected to RF current to reflow the solder preform (88) to join contact sections (26) to traces (94). Block (42) is then removed along the body section (62) and portions of figures (66), defining discrete electrical connections at the solder joints.
Abstract:
A connector (10) having one or more arrays of elongate cantilever beam arms (22) of contacts (20) can have contact sections (26) on free ends (24) thereof soldered to respective traces (94) of a circuit element (90), by securing a lead frame (50) to free ends (24) which includes a corresponding plurality of fingers (56) extending from a carrier strip (52). On the finger ends (58) are affixed preforms (80,82) of solder; on the carrier strip (52) is defined a thin magnetic layer, transforming the brass carrier strip into a Curie point heater. When the carrier strip is subjected to RF current, it generates thermal energy which melts the solder preforms to join the fingers first to the contact sections (26) of the connector contacts (20), and in a remote location later subjected to RF current to reflow solder preform (82) to join contact sections (26) to traces (94).
Abstract:
On an electric circuit substrate comprising an electric circuit, a radiator plate is placed for heat radiation of an integrated circuit structure and a transistor which emits heat, and the integrated circuit structure and the transistor are placed on the radiator plate and a power supply terminal is integrally provided on the radiator plate.
Abstract:
An active connector assembly (10) for use in acting on electrical signals is disclosed. The assembly (10) includes a receptacle (14) for mounting on a printed circuit board (30), a pin header (12) for receiving signals from other data handling systems and a circuit card (16) attached electrically and mechanically along one edge (16a) to contact elements (26) in the pin header (12) and having an opposing edge (16b) for insertion into the receptacle (14) and electrical engagement with contact elements (28) therein.
Abstract:
An interchangeable adapter module allows a circuit board, tape cartridge system, or other add-on device to be readily interfaced with any of a variety of different computer systems. A number of pins extend perpendicularly outward from the device circuit board. An adapter circuit board having a pin connector attached thereto engages these pins to removably secure the adapter module in a plane parallel to the device circuit board. One or more external connectors attached to the adapter circuit board are then plugged into corresponding connectors of the external electronic system. Electrical interface circuitry on the adapter circuit board provides electrical interconnections between a predetermined set of the pins attached to the device, and a predetermined set of the electrical contacts of the external connectors.
Abstract:
A telephone connector in which a contact holder carrying a plurality of contacts is disposed in a body which has in its front a plug receiving hole and is open at its bottom. Mounting members for mounting the body on a printed circuit board are provided on both side panels of the body. The mounting members define the plane in which the body is mounted on the printed circuit board. Lower end faces of both side panels of the body are substantially flush with this plane. After terminals of the contacts have been automatically soldered to the printed circuit board, the open bottom of the body is closed by a separately prepared cover.
Abstract:
A feedthrough capacitor arrangement which comprises a frame having a first recess, printed circuit boards disposed in the vicinity of the frame, a feedthrough capacitor having an outer electrode and a central electrode placed in the first recess and a shield member for pressing the feedthrough capacitor placed in the first recess thereby to hold the feedthrough capacitor in association with the frame. In this arrangement, the outer electrode of the feedthrough capacitor is soldered to the frame and to the shield member while the central electrode is soldered to conductor patterns on the printed circuit boards.