Abstract:
A ceramic chip carrier is disclosed which preferably includes a ceramic substrate having a circuitized surface, at least one semiconductor chip mounted on the circuitized surface, and at least one pin which is mechanically and electrically connected to a contact pad on the circuitized surface. Each mechanical/electrical connection between a pin and a contact pad includes a conventional solder connection. In addition, each such solder connection is at least partially encapsulated in a material, including an epoxy resin, which is chosen in relation to the solder connection to enable the solder connection to withstand a standard thermal fatigue test.
Abstract:
A high-density circuit module has a box shaped shielding case made from a plate blank which is bent to provide the shield case. A printed wiring board is placed on the bottom surface portion of the shielding case, and a plurality of electronic components are soldered to conductor lands of the printed wiring board. A plurality of externally connected leads are soldered to connection lands of the printed wiring board. A process for producing the high-density circuit module includes the steps of placing the printed wiring board on the blank, then soldering the electronic components and leads to the printed wiring board and then bending the blank to provide the shielding case. The plurality of externally connected leads are formed from a plurality of leads which are originally integrally connected to the bottom surface portion of the shielding case, by separating the plurality of leads form the bottom surface portion of the shielding case. A high-density circuit module having a small number of parts and a simple structure is easily manufactured.
Abstract:
A multiple-terminal unit comprises a first and a second group of teeth extending from one edge of a band-shaped. The teeth in the first group and the second group are bent at different positions so that their stem parts are staggered. In another aspect of the invention, the part at which a terminal and wiring pattern on a substrate a fixed by resin, preferably thixotropic resin.
Abstract:
A multiple-terminal unit comprises a first and a second group of teeth extending from one edge of a band-shaped. The teeth in the first group and the second group are bent at different positions so that their stem parts are staggered. In another aspect of the invention, the part at which a terminal and wiring pattern on a substrate a fixed by resin, preferably thixotropic resin.
Abstract:
A contact element and contact element assembly of electrically conducting material, intended, in particular, for surface mounting at a connecting area near the edge of a circuit substrate comprising an opening or recess. The contact element has a flat base face which in the mounted state of the contact element is situated completely or partially opposite the connecting area. The contact element also has at least one positioning device which projects from the flat base face and extends into the opening or recess of the substrate the contact element is mounted to the positioning device may be a positioning finger which fits freely into the opening or recess, or a positioning finger which acts on the substrate in a manner such that a retaining force is provided for keeping the contact element in position.
Abstract:
Spacing elements are integrally formed on the constituent surfaces of conductive interfaces of electronic circuit device components for providing uniform thickness solder or other bonding film between the surfaces. The interfaces may be electrically conductive interfaces such as those defined between leads and substrate contact pads as well as thermally conductive interfaces such as those defined between heat sinks and substrates. Any suitable spacers which maintain the constitutent surfaces a selected distance apart when the components are pressed together may be employed such as edge and corner flanges, convex dimples, annular protrusions, tangs, among others. A tool is disclosed for forming the annular protrusions that is advantageously employed with comparatively thick electronic circuit device components and with laminated electronic circuit device components having a comparatively hard layer.
Abstract:
An electrical circuit device having a ceramic substrate including a thick or thin film circuit on at least one surface thereof and an intersecting edge surface which may support termination leads anchored thereto and further retained by solder deposited upon an edge termination coating. The termination coating underlying the solder extends over the edge defined by the intersecting surfaces. The component resides in form of the substrate to include an indented area in the form of a notch or a groove which intersects both adjoining surfaces to provide a means of receiving edge termination material, so as to insure a continuous and non-interrupted deposit of the material to complete the electrical circuit between the leads and the respective circuit components of the circuit defined on the said one substrate surface.
Abstract:
A packaged microcircuit includes a housing of insulating material having a plurality of apertures which extend from the interior of the housing to the outside. A metallized lead connection surface is formed on a wall of each aperture. A microcircuit having a plurality of terminals is disposed in the interior of the housing with each of its terminals aligned with a respective aperture. The individual leads extend into the apertures and are soldered to both the terminals and the housing. The first solder connection electrically connects each lead to the terminal aligned with the aperture and the second solder connection anchors each lead to the metallized surface of the housing to absorb mechanical stress applied to an outwardly extending portion of the lead.
Abstract:
Prefabricated fingers suitable for mounting on a printed circuit board for use in conjunction with card edge connectors are provided on a lengthwise strip which may be cut to the desired size to correspond with the number of fingers which are to be mounted on the board. The strip, which may be formed in a roll, includes a pair of parallel carriers. The fingers extend between and are integrally formed with the carriers and are spaced along the lengths thereof and in substantially coplanar relationship therewith. After severing one of the carriers, the resulting free ends of the fingers may be aligned in overlapping relation with the circuit conductor ends to which the fingers are to be joined. After the finger free ends are joined to the printed circuit conductors and after the fingers are joined to the printed circuit board, the remaining carrier which projects beyond the edge of the circuit board is severed from the other ends of the fingers to permit or allow same for mating with a cooperating edge connector which is to be electrially connected to the printed circuit on the board.
Abstract:
An improved substrate for mounting electronic components including a plurality of uniformly spaced terminals on opposite sides along an edge of the substrate. The terminals comprise a contact having an outward bow, a narrowed transition section extending from the contact at an oblique angle from the longitudinal axis of the contact, and a tail bent at an angle, inserted through a first hole spaced from the edge of the substrate, bent at a second opposite angle along a side of the substrate, and inserted laterally in a second spaced hole by forming a U-shaped bend in the tail within the hole.