Abstract: A board consisting of a polyimide layer and copper foils is worked from one direction by etching to form through-holes, and the copper foils and inside of the through-holes are plated with copper, or the board is worked by etching or laser machining to form blind holes to expose the copper foils on the other side and through-holes simultaneously, and copper foils and insides of the blind holes and the through-holes are plated with copper. A metal ball plated with a noble metal is fixed on the copper foil by solidification of a metal paste to form an electric contact. Two superimposed plastic sheets are formed with holes each having a projection on inner wall of the hole, thereby vertically holding conductors by the projections of the holes of the superimposed plastic sheets. A laser beam machining method fabricates grooves or slits in a workpiece.

Abstract: Method for preventing solder from rising to a portion of an electric contact when the electric contact is being soldered to a copper foil so as to extend therefrom. The portion is plated with a noble metal and adapted to contact a mating object. Cooling means is brought into contact with at least the portion of the electric contact adapted to contact the mating object, and connection portion between the electric contact and the copper foil is heated by heating means. The rising of solder can be prevented and the electric contacts thus obtained are superior in mechanical property (sufficient bonding strength), electrical property (conductive property and low contact resistance), resistance to environmental conditions (impediment to oxidization), and physical property (limitation of rise of solder due to capillary action).

Abstract: A connector includes contact conductors each having two contact portions and a conductor connecting the two contact portions arranged on a flexible printed circuit board folded back so that the contact portions arranged its front and rear faces can be connected to contacts of connecting objects, pushing device provided on the circuit board, and an elastic member arranged between the contact portions on the front and rear faces. Another connector includes a flexible printed circuit board not being folded back, an elastic member held on the side of the circuit board opposite from the contact portions, and at least one pushing member for pushing the circuit board and the connecting objects. A pushing jig includes pushing portions provided on a base material to be pushed against connecting objects, an elastic member held on the base material opposite side of the pushing portions, and at least one pushing member for pushing the base material and the connecting objects.

Abstract: An electrical connector for connecting oppositely arranged first and second mating electrical devices includes a support member, a first circuit having a plurality of electric contact elements arranged on one surface of the support member to contact electric contacts of the first mating electrical device, a second circuit having a plurality of electric contact elements arranged on the other surface of the support member to contact electric contacts of the second mating electrical device, and conductors connecting the first and second circuits. The electric contact elements of the first and second circuits are formed in the most suitable manner to meet the shapes of the mating electric contacts, respectively. The support member is formed through its thickness with slits closely around the electric contact elements, respectively.

Abstract: Method for preventing solder from rising to a portion of an electric contact when the electric contact is being soldered to a copper foil so as to extend therefrom. The portion is plated with a noble metal and adapted to contact a mating object. Cooling means is brought into contact with at least the portion of the electric contact adapted to contact the mating object, and connection portion between the electric contact and the copper foil is heated by heating means. The rising of solder can be prevented and the electric contacts thus obtained are superior in mechanical property (sufficient bonding strength), electrical property (conductive property and low contact resistance), resistance to environmental conditions (impediment to oxidization), and physical property (limitation of rise of solder due to capillary action).

Abstract: A connector includes contact conductors each having two contact portions and a conductor connecting the two contact portions arranged on a flexible printed circuit board folded back so that the contact portions arranged its front and rear faces can be connected to contacts of connecting objects, pushing device provided on the circuit board, and an elastic member arranged between the contact portions on the front and rear faces. Another connector includes a flexible printed circuit board not being folded back, an elastic member held on the side of the circuit board opposite from the contact portions, and at least one pushing member for pushing the circuit board and the connecting objects. A pushing jig includes pushing portions provided on a base material to be pushed against connecting objects, an elastic member held on the base material opposite side of the pushing portions, and at least one pushing member for pushing the base material and the connecting objects.

Abstract: A method for producing an electric contact extending from a copper foil, comprises steps of fixing a cover lay having a hole of a diameter smaller than that of the copper foil of a predetermined size to the copper foil, and plating the hole of the cover lay so as to reach the upper surface of the cover lay as a first step; installing a dry film having a hole of a diameter smaller than that of the hole of the cover lay onto the cover lay, and plating the hole of the dry film so as to reach the upper surface of the dry film as a second step; and after removal of the dry film, as a third step further plating the plate layers obtained in the first and second steps. The electric contacts produced by the method have a predetermined height which is as high as possible and uniform without causing any defective connection between them. In a method for producing an electrical connector, diameters of the holes of the dry film in plating are changed depending upon positions of the electric contacts.

Abstract: A board consisting of a polyimide layer and copper foils is worked from one direction by etching to form through-holes, and the copper foils and inside of the through-holes are plated with copper, or the board is worked by etching or laser machining to form blind holes to expose the copper foils on the other side and through-holes simultaneously, and copper foils and insides of the blind holes and the through-holes are plated with copper. A metal ball plated with a noble metal is fixed on the copper foil by solidification of a metal paste to form an electric contact. Two superimposed plastic sheets are formed with holes each having a projection on inner wall of the hole, thereby vertically holding conductors by the projections of the holes of the superimposed plastic sheets. A laser beam machining method fabricates grooves or slits in a workpiece.

Abstract: A jig to be in contact with solder in reflow soldering is coated with diamond-like-carbon on at least a portion which is to be in contact with the solder. In this manner the solder is prevented from adhering to the jig. The diamond-like-carbon coating is preferably provided on the whole surface of the jig facing to the molten solder. In a method for connecting connection members using a jig which can be in contact with solder in reflow soldering, the jig is coated with the diamond-like-carbon on its surface which is likely to contact the solder.

Abstract: An electrical connector includes an elastomer in the form of a layer, and a plurality of fine conductive wires embedded in the elastomer and extending rectilinearly in vertical directions to front and rear surfaces of the elastomer. The fine conductive wires have an overall length substantially the same as or slightly larger than the thickness of the elastomer so that both the ends of the fine conductive wires extend from the front and rear surfaces of the elastomer. The electrical connector includes a flexible printed circuit board connected to the fine conductive wires. The flexible printed circuit board includes at least three electric contacts arranged substantially concentrically around and electrically connected to each of the fine conductive wires. With this arrangement, the electrical connector enables a stable inspection for integrated circuit pads in a manner which minimizes irregularities in repeatedly measured values of electric resistance and skew.

Abstract: An electrical connector includes an elastomer in the form of a layer, and a plurality of fine conductive wires embedded in the elastomer and extending rectilinearly in vertical directions to front and rear surfaces of the elastomer. The fine conductive wires have an overall length substantially the same as or slightly larger than the thickness of the elastomer so that both the ends of the fine conductive wires extend from the front and rear surfaces of the elastomer. The electrical connector includes a flexible printed circuit board connected to the fine conductive wires. The flexible printed circuit board includes at least three electric contacts arranged substantially concentrically around and electrically connected to each of the fine conductive wires. With this arrangement, the electrical connector enables a stable inspection for integrated circuit pads in a manner which minimizes irregularities in repeatedly measured values of electric resistance and skew.

Abstract: An electrical connector includes an insulator and a plurality of contacts supported by the insulator. The insulator formed of an insulating plastic material is formed with a plurality of contact insertion apertures for inserting the contacts. Surfaces of the insulator around the contact insertion apertures are metallized, while the contact insertion apertures are independently electrically insulated. With this arrangement, substantially high shielding effect and sufficiently high speed information transmission are effectively accomplished.

Abstract: A method for connecting connection members to through-holes of a board by soldering is disclosed. The board is press holded on its one side by a jig, and paste solder or solder in paste form is forced to flow into each of the through-holes of the board from the opposite side by a paste solder printing method using a printing mask. The printing mask is then removed under the condition of the paste solder being filled in the through-holes. After the connection members have been inserted in the through-holes of the board or have been urged against the board on the opposite side, the connection members are further connected to the board by reflow soldering, while the board is still continuously restrained or press holded on the one side by the jig. In this manner, it become possible to form any desired shapes of a plurality of solder connection portions connected to the board on the one side.

Abstract: An electrical connector includes an elastomer layer or board and a plurality of fine lead wires embedded in the elastomer layer and extending rectilinearly therein at right angles to both the surfaces of the elastomer layer. Recesses are formed in the elastomer layer around peripheries of openings of through-holes in which the fine lead wires are embedded. The electrical connector further includes two flexible printed circuit boards on both the sides, each including electric contacts to be connected to mating contacts, connection portions each formed with a through-hole passing therethrough, and conductors each electrically connecting the connection portion to the electric contact.

Abstract: An electrical connector includes a housing having a fitting opening for a mating connector, a flexible printed circuit board having electric contact elements capable of detachably fitting with the mating connector, a block embracing the flexible printed circuit board with the housing, bit inserts causing the block and the housing to be engaged with each other, and urging members for urging the flexible printed circuit board to a substrate. The housing is provided with at least two positioning pins as positioning device with respect to the block. The positioning pins are able to be slightly press-fitted in insertion apertures of the flexible printed circuit board. The block is provided with positioning apertures at locations corresponding to the positioning pins of the housing.

Abstract: In an electronic component provided with an electric contact(s) producing an electric conduction by contacting with a contact(s) of a second electronic component, the electric contact comprises a lead-free alloy layer containing tin and silver, and a surface layer portion of the alloy layer at least contacting with the contact of the second electronic component is a tin-rich layer having a tin content higher than that of the other portion of the alloy layer.

Abstract: A jig to be in contact with solder in reflow soldering is coated with diamond-like-carbon on at least a portion which is to be in contact with the solder. In this manner the solder is prevented from adhering to the jig. The diamond-like-carbon coating is preferably provided on the whole surface of the jig facing to the molten solder. In a method for connecting connection members using a jig which can be in contact with solder in reflow soldering, the jig is coated with the diamond-like-carbon on its surface which is likely to contact the solder.

Abstract: An electrical connector includes an insulator and a plurality of contacts supported by the insulator. The insulator formed of an insulating plastic material is formed with a plurality of contact insertion apertures for inserting the contacts. Surfaces of the insulator around the contact insertion apertures are metallized, while the contact insertion apertures are independently electrically insulated. With this arrangement, substantially high shielding effect and sufficiently high speed information transmission are effectively accomplished.

Abstract: An electrical connector includes an elastomer layer or board and a plurality of fine lead wires embedded in the elastomer layer and extending rectilinearly therein at right angles to both the surfaces of the elastomer layer. Recesses are formed in the elastomer layer around peripheries of openings of through-holes in which the fine lead wires are embedded. The electrical connector further includes two flexible printed circuit boards on both the sides, each including electric contacts to be connected to mating contacts, connection portions each formed with a through-hole passing therethrough, and conductors each electrically connecting the connection portion to the electric contact.

Abstract: A method for producing a press in contact having a press-fitting portion having a U-shaped or V-shaped groove in cross-section to be press-fitted in a cylindrical through-hole of a printed circuit board. A block element having a rectangular cross-section corresponding to the press-fitting portion of the contact is formed at its center with a concaved portion by forging. Both the ends of the forged block element are removed by punching. Thereafter, the remaining U-shaped or V-shaped press-fitting portion in cross-section is further so worked by press working that its outer periphery is formed into arcs which are concentric to the through-hole when the press-fitting portion has been press-fitted and fixed therein.