摘要:
A large number of pads, to which component leads are to be soldered, are formed on an insulating substrate so as to constitute a pad array. Colder layers are precoated on the pads. Each of the pads has a component lead mounting portion where a component lead is to be mounted, and a component lead non-mounting portion where no component lead is to be mounted. The component lead non-mounting portion includes a wide part having a width greater than that of the component lead mounting portion.
摘要:
A method for forming a solder-bumped circuit trace on a planar dielectric substrate includes fabricating a trace having an intersection between linear section, depositing onto the trace a uniform thin plate of solder alloy and reflowing the solder alloy to form a bump at the intersection. More particularly, the trace comprises first and second linear sections that intersect at an angle between 45 degrees and 135 degrees and have widths preferably between 50 and 150 microns. The solder plate is deposited, preferably by electroplating, at a thickness between about 10 and 25 microns. Thereafter, when the trace is heated to melt the solder layer, the solder coalesces at the intersection to form the bump.
摘要:
A device for soldering electrical or electronic components on a printed circuit board includes a soldering nozzle arrangement arranged above a solder crucible. The nozzle arrangement includes at least one carrier, on which at least one soldering nozzle is arranged. Molten solder is conveyed, using a conveyor unit, out of the solder crucible through the soldering nozzle to the components to be soldered. At least one discharge unit is arranged between a tip of the soldering nozzle and the carrier for any excess solder that has left the soldering nozzle. The discharge unit includes at least one baffle plate substantially surrounding the soldering nozzle.
摘要:
A device for soldering electrical or electronic components on a printed circuit board includes a soldering nozzle arrangement arranged above a solder crucible. The nozzle arrangement includes at least one carrier, on which at least one soldering nozzle is arranged. Molten solder is conveyed, using a conveyor unit, out of the solder crucible through the soldering nozzle to the components to be soldered. At least one discharge unit is arranged between a tip of the soldering nozzle and the carrier for any excess solder that has left the soldering nozzle. The discharge unit includes at least one baffle plate substantially surrounding the soldering nozzle.
摘要:
A printed circuit board according to the present invention includes a printed wiring board, first electrodes, second electrodes, third electrodes, solders, and a flip chip. The printed wiring board includes a first surface and a second surface which is opposite the first surface. The first electrodes are respectively formed on the first surface. The second electrodes correspond to and are disposed near each of the first electrodes, and are respectively formed on the first surface. The third electrodes electrically respectively connect the first electrodes and the second electrodes corresponding to each of the first electrodes. The solders are applied so as to respectively cover the first electrodes, the second electrodes corresponding to the first electrodes, and the third electrodes connecting the first electrodes and the second electrodes. The flip chip is electrically connected to each of the first electrodes at a position opposed to the first electrodes.
摘要:
A printed circuit board is provided with two soldering land portions on respective lead lines. Each of the soldering land portions has two sub-soldering land portions and a narrow connecting portion for connecting the sub-soldering portions, so that the land portions are substantially H-shaped. When the printed circuit board is dip soldered after being coated with a solder-proof layer exposing the soldering land portions, solder sticks to the soldering land portions in such a way that it is thicker on the sub-soldering land portions but thinner on the narrow connecting portions. Thereafter, the synchro contacts of a camera flash unit are positioned on the respective narrow connecting portions and soldered to the lead lines by a soldering iron or hot air.
摘要:
A method and apparatus for bonding electrical conducting means having a body, a first lead, and a second lead to a printed circuit board having a first side and a second side. A first surface mount pad is formed on the first side of the printed circuit board. A reservoir pad is formed on the first side of the printed circuit board. A second surface mount pad is formed on the second side of the printed circuit board. A via hole is formed in the printed circuit board. The via hole runs from the first side to the second side of the printed circuit board. The via hole abuts the reservoir pad and the second surface mount pad. Bonding means is deposited onto the first surface mount pad and the reservoir pad and into the via hole but not onto the second surface mount pad. The first lead of the electrical conducting means is placed against the bonding means deposited on the first surface mount pad and the second lead of the electrical conducting means is placed below the second surface mount pad. The bonding means is heated. The bonding means is cooled.
摘要:
A printed circuit board assembly (PCBA) chip package component includes: a module board and an interface board. A first soldering pad is set on the bottom of the module board, a second soldering pad is set on top of the interface board, and the second soldering pad is of a castle-type structure. The first soldering pad includes a first soldering area, a second soldering area, and a connection bridge that connects the first soldering area and the second soldering area. The first soldering area corresponds to a top surface of the second soldering pad, and when the first soldering area is soldered to second soldering pad, the second soldering area is located outside the second soldering pad.
摘要:
A controlled-shaped solder reservoir provides additional solder to a bump in the step for increasing the volume of solder forming the solder bump. The controlled shaped reservoirs can be shaped and sized to provide predetermined amounts of solder to the solder bump. Thus, the height of the resulting solder bump can be predetermined. The solder reservoirs can be shaped to take a minimum amount of space, such as by at least partially wrapping around the solder bump. Consequently, the solder bumps may have increased height without adding to the space requirements of the solder bump, or without increasing the fabrication cost. In addition, due to the finite time required for solder flow, a means of sequencing events during soldering is provided.
摘要:
An electronic circuit apparatus has first and second pad electrodes arranged on a substrate to be separated by a first interval, first and second chip electrodes to be separated by a second interval smaller than the first interval, a first solder for fixedly attaching the first chip electrode to the first pad electrode and a second solder for fixedly attaching the second chip electrode to the second pad electrode. Because the first interval is longer than the second interval, any constricted portion does not exist in each of the first and second solders. Therefore, because any stress is not concentrated on any portion of each of the first and second solders, the occurrence of a crack in each of the first and second solders can be prevented.