Abstract:
A method for providing a mechanical/electrical interconnection between two circuit boards, and the interconnection components required therefore, include a pin and socket each having a tail portion, a shoulder portion and a head portion. The tail portion of the pin is sized so as to fit into a plated through hole of the first board, the head portion is sized so as to allow an automated device to capture the head portion and to rest on top of the plated through hole when inserted therein, and the shoulder portion is sized in relation to the plated through hole so as to rest inside the plated through hole and to allow a predetermined amount of solder to flow under the head portion and down into the plated through hole, but not as far down as the tail portion, thereby assisting in centering the pin in the through hole. Upon heating to a solder reflow temperature, a ring of solder, around the periphery of the head portion of the pin and the shoulder portion of the socket, flows under the head of the pin and the shoulder of the socket, thereby forming a soldered electrical connection between the pin and the first board, and the socket and the second board. By aligning the pin with the socket and inserting the tail portion of the pin into the cavity of the socket, a separable reliable mechanical and electrical interconnection is formed between the first board and the second board.
Abstract:
A decoupling capacitor (40) is mounted on a thin auxiliary board (20) and connected by metallization traces (37, 33) on the board to a single pair of plug-in contacts (50, 51) press-fitted into a pair of apertures (36) in a pair of integral tabs (31, 32) extending from the board (30). The auxiliary board (20) and capacitor (40) height is not more than about 0.070 inches. The plug-in contacts (50, 51) are pluggable into a pair of sockets in a printed circuit board. The auxiliary insulative board (20) with its attached capacitor (40) is sandwiched between a surface of a printed circuit board (12) having a plurality of sockets, and the underside of a dual-in-line (DIP) integrated circuit package (11). At least two leads (15a, 14x) of the DIP package (11) are inserted into the pair of insertable contacts (50, 51) in the auxiliary insulative board (20) while the remainder of the DIP package leads are inserted directly into other sockets in the printed circuit board (16a, 16x, 17a, 17x). In one embodiment, other DIP leads pass through clearance holes (69, 68) in a second pair of integral tabs (63, 65). Another embodiment provides for redundant capacitors each connected to separate pairs of contacts (82, 83; 84, 85) on the auxiliary board (81) for interconnection of two ground leads and two power leads of the DIP to respective PC board sockets.
Abstract:
A decoupling capacitor (40) is mounted on a thin auxiliary board (20) and connected by metallization traces (37, 33) on the board to a single pair of plug-in contacts (50, 51) press-fitted into a pair of apertures (36) in a pair of integral tabs (31, 32) extending from the board (30). The auxiliary board (20) and capacitor (40) height is not more than about 0.070 inches. The plug-in contacts (50, 51) are pluggable into a pair of sockets in a printed circuit board. The auxiliary insulative board (20) with its attached capacitor (40) is sandwiched between a surface of a printed circuit board (12) having a plurality of sockets, and the underside of a dual-in-line (DIP) integrated circuit package (11). At least two leads (15a, 14x) of the DIP package (11) are inserted into the pair of insertable contacts (50, 51) in the auxiliary insulative board (20) while the remainder of the DIP package leads are inserted directly into other sockets in the printed circuit board (16a, 16x, 17a, 17x). In one embodiment, other DIP leads pass through clearance holes (69, 68) in a second pair of integral tabs (63, 65). Another embodiment provides for redundant capacitors each connected to separate pairs of contacts (82, 83; 84, 85) on the auxiliary board (81) for interconnection of two ground leads and two power leads of the DIP to respective PC board sockets.
Abstract:
An improved method and construction for positioning a plurality of socket terminals (34) on an electrical circuit board (22) in a predetermined configuration prior to the solder connection thereto. A sheet of electrically insulative, flexible, resinous plastic material (30, 30a) is provided with a plurality of holes (32, 32a) in an array conforming to the desired positioning of the sockets on the circuit boards. The socket terminals are provided with an enlarged generally cylindrical head (50) including an intermediate groove (68) such that the heads extend into the holes (32, 32a) and are adapted for frictional snap engagement with the sheet (30, 30a). The sheet with the array of sockets temporarily held thereby is positioned on the circuit board which is then conventionally soldered so as to electrically and mechanically fix the sockets to the boards. Thereafter, the sheet may be removed. The enlarged head (50) of the circuit terminal is provided with leading edge sheet contacting surface (66) to enable the terminals to be push positioned into the holes without injuring the sheet.
Abstract:
Construction et procédé améliorés de positionnement d'une pluralité de bornes femelles (34) sur une plaque de circuit électrique (22) selon une configuration prédéterminée avant le soudage. Une feuille de matériau plastique résineux flexible électriquement isolante (30, 30a) est pourvue d'une pluralité de trous (32, 32a) selon une matrice conforme au positionnement désiré des bornes sur les circuits imprimés. Les bornes femelles sont pourvues d'une tête élargie généralement cylindrique (50) comprenant une rainure intermédiaire (68) permettant à la tête de s'étendre dans les trous (32, 32a) et sont conçues pour s'engager par déclic à friction dans la feuille (30, 30a). La feuille avec le réseau de bornes qu'elle contient temporairement est positionnée sur la plaque de circuit qui est alors soudée de manière conventionnelle afin de fixer électriquement et mécaniquement les bornes sur les plaques. La feuille peut ensuite être enlevée. La tête élargie (50) de la borne de circuit est pourvue d'une surface de contact de feuille de bord d'attaque (66) permettant aux bornes femelles d'être positionnées par pression dans les trous sans abîmer la feuille.