Abstract:
A manner of precisely mounting a surface mounting connector to a substrate is taught. Briefly stated, after soldering of the contacts of a connector to the substrate, a radially wound steel roll pin is positioned in the mounting holes of the connector housing and is then urged downwards so as to cut through the substrate. The radial forces of the roll pin are used to retain the roll pin in position in the connector housing and in the substrate, thereby rigidly holding the connector housing to the substrate upon which it is mounted.
Abstract:
A LIF or ZIF connector having improved contact wiping is disclosed herein. Briefly stated, a connector having contacts therein is provided with the contacts moving into or out of engagement with traces disposed on a daughter board. At the time of, or immediately after engagement of the contacts of the connector with the traces on the daughter board, a wiping cam causes the daughter board to be moved with respect to the contacts thereby causing a wiping action between the traces and the contacts.
Abstract:
Machine for performing operations on strip material comprises a plurality of modules on a supporting bed. Each module has a strip feeder, a tooling assembly, and an actuating assembly. Strip is fed through the modules by the feeder and in each module the tooling assembly performs an operation such as stamping, forming, marking, etc. The modules feed the strip in a vertical plane and the modules are symmetrical with respect to the vertical plane of the strip. Preferably the actuating assembly and the tooling assembly is dynamically balanced. Advantages achieved include high speeds, reduced power requirements, reduced noise, and reduced tooling cost.
Abstract:
A ceramic chip carrier having a lead frame thereon with a removable lead frame support which does not bond to the ceramic during the bonding procedure and is later removed. A perforated ground pad is bonded to the substrate simultaneously with the leads of the lead frame and is attached to the lead frame support. The support area is of reduced thickness relative to the rest of the lead frame so that it does not come in contact with the ceramic substrate during the bonding procedure. After firing and bonding of the lead frame to the substrate, the unbonded support rim is removed by pinch cutting, etching or the like.
Abstract:
A chip carrier having a plurality of leads thereon for external interconnection with preferably only one of the leads utilized to provide a source of power to the chip and preferably a single lead utilized as a ground connection. The power and ground leads are connected in a bus structure around the chip at the center of the chip carrier with the chip being secured to the chip carrier with the bus structure over a thermal pad formed within the bus structure. A decoupling capacitor is located in close proximity to the chip on the substrate to assure low reaction due to switching.
Abstract:
A semiconductor chip carrier having a lead frame wherein the ends of each of the inner lead portions, which are closely adjacent to the semiconductor device to which the leads are to be bonded, are manufactured with the inner leads temporarily connected to a common supporting rim which must be removed after the attachment of the lead frame to the ceramic substrate is completed. This provides accurate and constant spacing between the leads of the lead frame during the bonding of the lead frame to the ceramic substrate. The rim is removed from the lead frame after bonding of the lead frame to the ceramic substrate. This is accomplished by reducing the thickness of the rim and a portion of the leads of the lead frame contacting and closely adjacent to the rim. This provides a space between the rim and the substrate during the bonding of the lead frame to the substrate. In this way, the rim and a small portion of the leads do not bond to the substrate, thereby allowing the rim to be later removed quite easily.
Abstract:
Electrical contact terminal of the flat coplanar type which is manufactured by stamping sheet metal, has a yoke portion having a latch arm and a spring arm extending therefrom. The latch arm is relatively short while the spring arm is of sufficient length to permit deflection thereof when the terminal is placed in service. The two arms have free ends which are adjacent to and resiliently biased against each other. The free ends are latched to each other by latching means which permits movement of the free end of the spring arm along a side edge of the latch arm. An edge portion of the spring arm serves as a contact portion and current flows from this contact portion to the end of the spring arm then to the latch arm and to the yoke portion of the terminal to provide a short low inductance current path for the current. The spring arm is in a preloaded and flexed condition so that an elevated contact pressure is achieved.
Abstract:
A method of making electrical devices, and the electrical devices made thereby, comprising the steps of: stamping from a sheet of metal a pattern of conductors configured to connect circuit components together in a relationship which forms a useful product, such as a watch, with the terminals of each of said circuit components being adjacent and connectable to appropriate terminating means formed in said pattern of conductors when said circuit components have predetermined positions adjacent said pattern of conductors; encapsulating said pattern of conductors with plastic having cavities and apertures formed therein, the cavities each having a configuration and a location to receive one of said circuit components therein in said predetermined positions and with said terminating means extending into said cavities to terminate the terminals of said circuit components; forming at least some of said component terminals on the surface of said components in positions to bend over the terminating means when the component is inserted in a cavity to thereby make an electrical connection between the component terminals and the terminating means, and to provide a retaining housing for the components in said cavity. In some instances, the component terminals are wire-like in shape and require the forming of the terminating means in a configuration which can be crimped therearound or, alternatively, require the forming of the terminating means into a plate with a slot therein and into which slot the wire-like terminal can be inserted. Some of the apertures in the plastic encapsulation are positioned to enable the severing of portions of the lead frame conductors which support the lead frame until it is encapsulated and others of the apertures are positioned to enable the severing of various combinations of selected conductors to produce different patterns of interconnections between the circuit components and thereby to produce various electrical devices each capable of performing different functions.
Abstract:
A circuit board (12) and electrical connector (10) mounted to an edge (18) thereof is disclosed. The circuit board (12) includes an edge (18) and two major surfaces (14, 16) extending therefrom having circuitry (20). Plated through holes (24) are arranged adjacent the edge and are interconnected to circuitry on the circuit board. Each plated through hole (24) is associated with an opening such as a slot (26) or partial slot (27) that is formed in the edge (18) of the board so that it intersects the hole. The posts (32) of the connector (10) extend into the openings (26, 27) preferably in interference fit therewith whereafter soldering completes the electrical connections of the posts to the through holes.
Abstract:
A method of manufacturing a guide plate for use in a chip carrier socket or other electrical connector provides the precision required for close-center line spacing while minimizing the cost associated with production. A block of ceramic or the like is ground to the precise outside dimensions required. Grooves are then cut in the block of ceramic, and the ceramic is then sliced into respective guide plates. The guide plates are inserted into openings provided in the electrical connector an retained therein. The grooves are dimensioned to cooperate with contact pins of the electrical connector to precisely maintain the pins in position, whereby when a chip is positioned in the electrical connector, the pins will be in position to make an electrical connection with the pads of the chip.