Abstract:
A circuit includes a substrate having a dielectric layer with a first surface and a second surface. A conductive layer is formed on the first surface. A beveled via is formed in a dielectric layer of the substrate. The via has a first opening of a first width in the first surface, and a second opening of a second width in the second surface, the second width being greater than the first width. A conductive plug is connected to the conductive layer. The plug is formed in the via and extends from adjacent the first opening toward the second opening, and terminates adjacent the second opening at a plug interface surface. A conductive solder ball is connected to the plug interface surface and extends to protrude from the second surface.
Abstract:
A printed circuit board and a method for manufacturing the same that facilitates the formation of an upper surface pattern and prevents a lower surface metal foil from being damaged when forming a blind via hole with a laser is provided. A lower surface and an upper surface of an insulative substrate (5) are respectively coated with a lower surface metal foil (220) and an upper surface metal foil (210), the thickness of which is less than that of the lower surface metal foil (220). Next, an opening (213) is formed in the upper surface metal foil at a location corresponding to a blind via hole formation portion (35) of the insulative substrate. A blind via hole (3), the bottom of which is the lower surface metal foil, is formed by emitting a laser (8) against the blind via hole formation portion (35) through the opening (213). Then, a metal plating film (23) is applied to the wall of the blind via hole (3), and an upper surface pattern (21) and a lower surface pattern (22) are formed through etching.
Abstract:
The invention concerns an integrated circuit module (1) comprising a support film (2) having a first surface (2.1) bearing the integrated circuit (3) and internal connection pads (4) and a second surface (2.2) bearing external connection pads (5) the internal and external connection pads being connected to the integrated circuit, the film support (2) second surface (2.2) comprising at least an electrically insulated peripheral zone (8) of the integrated circuit extending opposite at least one of the internal connection pads (4). The invention also concerns a mixed connection card comprising such a module.
Abstract:
Die Erfindung betrifft ein Verfahren zum Bestücken einer Leiterplatte (1), auf der zumindest eine Leiterbahn (2, 3) angeordnet ist, mit einem elektronischen Bauteil (4), das zumindest zwei Kontaktierungen (5) aufweist, wobei in die Leiterplatte (1) Sacklochbohrungen (6) eingebracht werden, wobei die Innenflächen der Sacklochbohrungen (6) mit einer leitfähigen Beschichtung (7) versehen werden, wobei die Kontaktierungen (4) in die Sacklochbohrungen (6) eingebracht werden und wobei die Kontaktierungen (4) mit den Sacklochbohrungen (6) leitend verbunden werden.
Abstract:
In the production of a printed wiring board comprising innerlayer conductor circuits 161, 131 arranged among insulating layers 101∼103 and blind via-holes 141, 142 formed from an outermost surface of the insulating layer toward the innerlayer conductor circuit, an opening hole 160 is previously formed in a central portion of the innerlayer conductor circuit 161 located at the bottom of the blind via-hole 141, and laser beams are irradiated from the outermost surface of the insulating layer to form the blind via-holes 141, 142. Thereafter, a metal plated film is formed on surfaces of the innerlayer conductor circuits 13, 161 and the blind via-holes 141, 142.
Abstract:
There is provided a tape carrier in which the degree of freedom of a fine wiring pattern is enhanced by reducing the diameter A of a via pad so that the pitch of the wiring pattern can be made fine, and a metallic ball (10) can be positively joined to the via pad when the diameter of the metallic ball (10) is as large as possible. A tape carrier comprises: a metallic wiring (3) formed on one side of a tape base material (1) through an adhesive layer (2); and a plurality of via holes (4) formed on the other side of the tape base material (1), via pads (3b) of the metallic wiring (3) being exposed to the plurality of via holes (4). Internal wall surfaces of the via holes, which have been formed by punching the tape material (5), from one side on which the adhesive layer (2) is formed, are subjected to coining-press from the other side of the tape base material (1), so that the via holes (4) are formed into tapered holes (7), the diameters of the open portions (6) which receive the metallic balls (10) are larger than the via pads (3b).
Abstract:
A multilayer printed circuit board comprises a core substrate, multilayer wiring layers formed thereon and a solder pad group formed by two-dimensionally arranging pads provided with solder bumps on the surface of the multilayer wiring layer, in which the solder pads of the solder pad group are arranged in only a peripheral portion other than a central portion to form a frame shape and the solder pads located at the outside part among the frame-shaped solder pad group are constructed with flat pads each connected to conductor pattern on their surface and solder bumps formed on the surfaces of the flat pads, while the solder pads located at the inside part are constructed with viaholes each connected to an innerlayer flat pad group located in an innerlayer and solder bumps formed in recess portions of these viaholes.
Abstract:
A printed wiring board suitable for reliable connections and reliable high-density mounting of components by using solder bumps. The printed wiring board has a mounting surface on which are formed pads coated with solder resist and having solder bumps. The position of the solder bump is coincident with the position of a via-hole, or the size of an opening disposed in the solder resist is made greater than a land diameter of the via-hole so that the solder resist does not overlap with the via-hole.
Abstract:
A solder resist composition comprises an acrylate of novolac type epoxy resin and an imidazole curing agent and has a viscosity of 0.5-10 Ps·s adjusted with glycol ether type solvent. A printed circuit board is formed by using such a solder resist composition.
Abstract:
Electronic interconnection of two printed wiring structures. Two printed wiring boards (11, 16) or a flexprint circuit (20) and a printed wiring board (11) are interconnected by creating a plated hole pattern (12) on a surface (12) of the printed wiring board (11), and wherein holes (13) of the pattern (12) have a concave cross section. The holes (13) of the plated hole pattern (12) are mated with corresponding bumps (17) or dimples (17) disposed on the second printed wiring board (16) or the flexprint circuit (20). The holes (13) formed in the first printed wiring board (11) are disposed a predetermined depth below a surface (18) of the printed wiring board (11), typically to a depth of between 0.007 inches and 0.020 inches below the surface. The plurality of plated holes (13) are formed by electroless plating or electroplating of the holes (13). The present interconnection structure (10) provides for reliable and self aligning interconnection of the two printed wiring boards (11, 16) or the flexprint circuit (20) and printed wiring board (11).