摘要:
An assembly is obtained; it includes a substrate; a plurality of wet-able pads formed on a surface of the substrate; and a solder resist layer deposited on the surface of the substrate and having an outer surface. At least the solder resist layer is formed with recessed regions defining volumes adjacent the wet-able pads. Molten solder is directly injected into the volumes adjacent the wet-able pads, such that the volumes adjacent the wet-able pads are filled with solder. The solder is allowed to solidify. It forms a plurality of solder structures adhered to the wet-able pads. The substrate and the solder are re-heated after the solidification, to re-flow the solder into generally spherical balls extending above the outer surface of the solder resist layer. The volumes adjacent the wet-able pads are configured and dimensioned to receive sufficient solder in the injecting step such that the generally spherical balls extend above the outer surface of the solder resist layer as a result of the re-heating step. In an alternative approach, solder injection and solidification are earned out in a nitrogen environment or a forming gas environment, and the reflow step may be omitted.
摘要:
A test point of a circuit board is probed using an edge probe provided in a fixed orientation when the edge of the probe contacts a solder mound of the test point. The solder mound has an elongated shape. A length of the edge is substantially perpendicular to a length of the solder mound when the edge contacts the solder mound and is maintained in the fixed orientation.
摘要:
According to one embodiment of the invention, a method for sealing one or more vias comprises providing a first substrate having vias, forming an adhesion layer on an inner surface of the vias, sandwiching a solder layer between the first substrate and a second substrate, and elevating of the first substrate, second substrate, and solder layer to a temperature above a eutectic point and below a melting point of the solder layer. The act of elevating the solder layer to a temperature above the eutectic point and below the melting point causes the solder layer to flow into the vias in a generally consistent manner.
摘要:
A method of depositing a solder mass within a plated opening that is formed in a side edge of an electronic device includes the steps of carrying the solder mass in a carrier device and orienting the carrier device with respect to the side edge such that the solder mass is aligned with the plated opening. The method further includes reflowing the solder mass to cause the solder mass to be deposited and securely held within the plated opening and then removing the carrier device leaving the solder mass behind within the plated opening and along the side edge of the electronic device.
摘要:
Die Erfindung bezieht sich u. a. auf ein Verfahren zum Bestimmen der Benetzungsfähigkeit eines Lotmaterials (100) auf einem mit dem Lotmaterial benetzbaren Oberflächenabschnitt (30) eines Trägers (10). Erfindungsgemäß ist vorgesehen, dass auf einer benetzbaren Testfläche (50) des Trägers (10) eine Teststruktur (100) aus Lotmaterial mit zwei in einer vorgegebenen Richtung (Z) auseinander laufenden Teilabschnitten (110, 120) derart aufgebracht wird, dass die beiden Teilabschnitte durch einen entlang der vorgegebenen Richtung breiter werdenden lotfreien Zwischenbereich (130) getrennt sind, die Teststruktur aufgeschmolzen und unter Bildung einer erstarrten Teststruktur (200) abgekühlt wird, wobei auf der benetzbaren Testfläche (50) zwei entlang der vorgegebenen Richtung auseinander laufende erstarrte Lotbereiche (210, 220) gebildet werden, die durch einen entlang der vorgegebenen Richtung breiter werdenden lotfreien Trennbereich (230) voneinander getrennt sind, die Stelle (S) ermittelt wird, an der sich die beiden erstarrten Lotbereiche (210, 220) auf der benetzbaren Testfläche (50) berühren, und die ermittelte Stelle (S) zur Bestimmung der Benetzungsfähigkeit herangezogen wird.
摘要:
Provided is a method for manufacturing a multilayer wiring board, by which interlayer connection is efficiently performed and a non-penetrating hole having a hollow structure or a through hole can be formed at the same time without damaging a plated portion on the inner wall of the through hole. A first printed board (1) is provided with a wiring, which has a wiring section and a bump mounting pad (14), and a substrate section. The method is provided with a step of forming a solder bump (3) on at least a bump mounting pad on the first printed board or a pad section of a second printed board (2) having the pad section (15) by using a solder paste, and a step of bonding the first printed board and the second printed board in layers by having an insulating adhesive (4) between the first printed board and the second printed board and electrically connecting the first printed board with the second printed board.
摘要:
A microelectronic assembly, a surface mount component and method of providing the surface mount component. The assembly comprises: a substrate having bonding pads disposed on a mounting surface thereof, the bonding pads including a ferromagnetic material therein; solidified solder disposed on the bonding pads; and a surface mount component bonded to the substrate by way of the solidified solder and including a magnetic layer disposed on a substrate side thereof, the magnetic layer being adapted to cooperate wit the ferromagnetic material in the bonding pads to establish a magnetic force of a sufficient magnitude to hold the surface mount component on the substrate before and during soldering.
摘要:
A solder composition capable of in the bump formation on a substrate, simplifying the coating operation. There is provided solder composition (10) comprising a mixture of liquid substance (12) and solder particles (11), wherein the liquid substance (12) contains a flux component of organic acid whose reaction temperature for oxide film removal is in the vicinity of the melting point of the solder particles and has such a viscosity that the liquid substance flows at ordinary temperature and accumulates in the form of a layer on substrate (20). The solder particles (11) consist of a particulate agent that settles in the liquid substance (12) toward a solder base material, having a particle diameter and mixing ratio enabling uniform dispersion in the liquid substance (12). By application of this solder composition onto substrate (20) with pad electrode (22) followed by heating, solder particles (11) adhere to the pad electrode (22) having its surface oxide film removed through reaction with the flux component to thereby promote soldering between any solder film formed on the base material and the solder particles (11), and further, aggregation of the solder particles (11) can be inhibited by a reaction product of the flux component to thereby form unbridged solder bumps (23).