Abstract:
A plastic-packaged semiconductor device, method of making same, and mounting same to a printed circuit board is disclosed. The device has a body, and a plurality of leads extending from the body. Plastic webs are formed between adjacent leads for supporting the leads. Plastic bumps are formed at the ends of the webs, and align with recesses between conductors of wiring patterns on printed circuit boards, aiding in alignment of the device with the board.
Abstract:
A device for mounting an element (10) on a board (20) which element (10) comprises at least one fixing lug (11) which is to engage in a slot (21) formed in the said board (20). According to the invention, the fixing lug (11) comprises a projection (12) engaging the board (20) inside the slot, and having a thickness which is at least equal to the width (1) of the slot (21). The invention is used to mount housings on printed circuit boards.
Abstract:
A flat package for semiconductor integrated circuit devices allows edge-mounting and surface-mount. The package may be molded plastic containing a semiconductor chip, and flat leads extend from one edge of the package. The leads are bent to provide an area to solder to conductors on a PC board. Mechanical positioning, mechanical support and spacing are provided by studs extending from the edge of the package adjacent the leads. The studs have stops formed at a position even with flat outer surfaces of the bent leads; the portion outward of the stops fits into holes in the PC board.
Abstract:
A semiconductor package having a gull-wing, zig-zag, inline-lead configuration and end-of-package anchoring devices for rigidly affixing the package to a circuit board such that each lead is in compressibe contact with its associated mounting pad on the board. The anchoring devices of a first embodiment comprise anchoring pins having fish-hook-type barbs which lock against the under side of the board when the pegs are inserted through holes in the board; a second embodiment utilizes anchoring pins which are adhesively bonded in recesses that have been drilled or molded into the board; a third embodiment utilizes anchoring pins, the ends of which can be bonded directly to planar peg-bonding regions on the surface of the board; and a fourth utilizes tapered anchoring ping which may be inserted with an interference fit into holes in the board. The invention eliminates the need for mechanical support of the packages during solder reflow operations used during board assembly and repair.
Abstract:
A stanchion having a base with holes passing therethrough is used to hold elongated electronic device packages in a vertical position during assembly of a circuit board. The leads extending from the end of the device package are positioned in the holes in the base and the device package retained in the vertical position by attachment arms extending upwardly from opposite sides of the base defining a cavity for receiving the device package. Legs extending from the base support the device package above the surface of the circuit board to permit cleaning of the assembly.
Abstract:
A surface mountable leadless fuse generally includes a tubular fuse sub-assembly with an insulating body molded thereto in intimate sealing relation. The tubular fuse sub-assembly includes a nonconductive tubular housing, cup-shaped metal end caps enclosing the housing. The insulating body includes an upper and lower portion which are integral as molded. The end caps protrude from a bottom surface of the insulating body so that the fuse can engage the flat conductive areas of a circuit board for soldering thereto without obstructiion of the insulting body. The end caps also protrude from the end surfaces so that visual inspection and solder wetting are unobstructed. The lower portion of the insulating body covers an exposed portion of the tubular housing. A pair of anti-rolling legs depend from opposed margins of the bottom surface to prevent the fuse from rolling off of the circuit board once placed there.
Abstract:
A carrier for leadless electrical and electronic components has a plurality of recesses, for reception of components. Electrically conductive paths formed on surfaces in the recesses make contact with contacts on the components. The conductive paths extend onto a bottom surface of the carrier and over protrusions or feet on the bottom surface. The protrusions make contact with contact pads on a circuit pattern on a circuit board. The carrier holds components which otherwise could be as readily mounted to the surface of a circuit board as can the carrier. A high number of components per unit surface area of a circuit board can be mounted via the carrier. The carrier can be positioned by an automated apparatus.
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 visual indicator lamp support is provided comprising an elongate insulating body having a front face and a rear face substantially perpendicular to its longitudinal dimension and forming, at its front face, jaws for insertion of the indicator lamp, a bearing surface inside said body cooperating with the rear face of the indicator lamp, holes through which the wires thereof extend formed through said body and means for securing to a printed circuit card, wherein said body forms a reference surface perpendicular to said rear face and joined thereto by a re-entrant surface adapted for freeing a portion of said wires and shaped so that bending back of said body from a first position in which its rear face is in abutment against the card and plays the role of spacer defining a pre-determined distance between said rear face of the indicator lamp and the surface of the printed circuit for soldering said wires to a second position in which said reference surface is in abutment against the card, results in causing pre-determined bending of said wires.
Abstract:
Electrical components (10 or 30) are fastened to a mounting surface (16) of a printed circuit board (11) by forming a plurality of thermoplastic pins (20, 35) projecting from the mounting surface of the board adjacent to positions where components are to be located. The component is placed on the board so that portions of the component are located adjacent to portions of the pins, following which portions of the pins are heated and formed about portions of the component to form plastic locking sections (22 or 37) that fasten the component to the board in a desired position. The mounting surface (16) of the board may be formed with a pocket (18 or 33) that receives and positions the component at the desired location, so that component leads (17 or 32) extend along the mounting surface to positions overlapping lead-contact areas (14, 34) of printed contact patterns deposited on the mounting surface, after which the leads are attached to the contact areas, as by reflow soldering.