摘要:
A soldering apparatus has a conveyor which conveys an electronic circuit board, a fluxer which applies a flux having water as a solvent to a surface of the electronic circuit board to be soldered, a first heating device which heats the electronic circuit board, a water removal device which removes water attached to the electronic circuit board, a second heating device which heats the electronic circuit board to maintain the electronic circuit board at a temperature at which the flux exerts its activating action, a flow soldering bath in which molten solder is attached to the electronic circuit board, and a cooler. The water removal device includes a gas blowing portion having a first jig which blows a gas to an electronic component disposition surface, and a drawing portion having a second jig which draws water from the surface to be soldered.
摘要:
The present invention provides a flow soldering apparatus that can suppress the occurrence of soldering defects, even if VOC-free flux or low-VOC flux is applied to an electronic circuit substrate. In other words, the flow soldering apparatus according to the present invention includes: a water content sensor for measuring a residual water content of a surface of a substrate; and a monitoring device for judging whether soldering quality is satisfactory or not by using a residual water content value of the surface of the substrate acquired from the residual water content measured by the water content sensor, on the basis of a correlation between a residual water content value of a surface of a sample substrate and a residual water content value of through holes of the sample substrate, as acquired previously by using a plurality of substrate samples.
摘要:
A soldering apparatus has a conveyor which conveys an electronic circuit board, a fluxer which applies a flux having water as a solvent to a surface of the electronic circuit board to be soldered, a first heating device which heats the electronic circuit board, a water removal device which removes water attached to the electronic circuit board, a second heating device which heats the electronic circuit board to maintain the electronic circuit board at a temperature at which the flux exerts its activating action, a flow soldering bath in which molten solder is attached to the electronic circuit board, and a cooler. The water removal device includes a gas blowing portion having a first jig which blows a gas to an electronic component disposition surface, and a drawing portion having a second jig which draws water from the surface to be soldered.
摘要:
The present invention provides a flow soldering apparatus that can suppress the occurrence of soldering defects, even if VOC-free flux or low-VOC flux is applied to an electronic circuit substrate. In other words, the flow soldering apparatus according to the present invention includes: a water content sensor for measuring a residual water content of a surface of a substrate; and a monitoring device for judging whether soldering quality is satisfactory or not by using a residual water content value of the surface of the substrate acquired from the residual water content measured by the water content sensor, on the basis of a correlation between a residual water content value of a surface of a sample substrate and a residual water content value of through holes of the sample substrate, as acquired previously by using a plurality of substrate samples.
摘要:
An electronic device manufacturing method includes: setting a solder material on electrodes of a first circuit assembly; setting a resin having a flux action on one surface of a second circuit assembly so as to entirely cover solder bumps formed on the one surface of the second circuit assembly; setting the second circuit assembly on the first circuit assembly via the resin so that the solder material set on the electrodes of the first circuit assembly and the solder bumps of the second circuit assembly are put into contact with each other; and applying thermal energy to connecting portions between the solder material and the solder bumps and to the resin. By carrying out these processes, an electronic device in which the first circuit assembly and the second circuit assembly are joined together and in which their junction portions are sealed by the resin is manufactured. As a result, in the electronic device, junction reliability can be improved.
摘要:
A resin composition is provided that makes it possible to prevent low-heat resistant components from being damaged when heated in a process of mounting electronic components on a circuit board. There are also provided a method for easily repairing circuit boards that are determined to be off-specification products in the mounting process, and a method for separating and recovering useful circuit boards and/or electronic components from the circuit boards that are determined to be off-specification products in the mounting process. The resin composition comprises (A) 100 parts by weight of an epoxy resin, (B) 30 to 200 parts by weight of a thiol-based curing agent, (C) 5 to 200 parts by weight of an organic-inorganic composite insulating filler and (D) 0.5 to 20 parts by weight of an imidazole-based curing accelerator. According to the recovering method, the resin composition is softened by heating a part or whole of the circuit board in the mounting process, to a temperature in range not lower than the glass transition point of the resin composition and not higher than 110° C., and separating and recovering the electronic components from the circuit board.
摘要:
Disclosed is an electrically conductive paste which enables to reduce the level of void growth in a conducting pathway formed in a joint part produced after curing the electrically conductive paste in the implementation of an electronic component on a circuit board by using the electrically conductive paste, and which contains a reduced amount of a viscosity-adjusting/thixotropy-imparting additive. Two Sn-containing low-melting-point alloy particles having different melting points and different average particle diameters are selected as electrically conductive filler components to be used in an electrically conductive paste, and the two alloy particles are mixed at a predetermined ratio for use.
摘要:
A semiconductor device mounted structure includes a semiconductor device having a plurality first electrodes, a circuit board having a plurality of second electrodes, a plurality of bumps respectively formed on the plurality of first electrodes, a plurality of bonding members respectively positioned between the bumps and the second electrodes to electrically connect the first electrodes to the second electrodes via the bumps, and a plurality of reinforcing resin members respectively positioned around the bonding members so as to cover at least the bonding members and bonding regions between the bonding members and the bumps. Adjacent reinforcing resin members are spaced away from each other so as not to have contact with each other without being in contact with the semiconductor device. This semiconductor device mounted structure enhances the reliability of joints in impact resistance and makes it easy to repair it.
摘要:
A semiconductor device mounted structure includes a semiconductor device having a plurality of first electrodes, a circuit board having a plurality of second electrodes, a plurality of bumps respectively formed on the plurality of first electrodes, a plurality of bonding members respectively positioned between the bumps and the second electrodes to electrically connect the first electrodes to the second electrodes via the bumps, and a plurality of reinforcing resin members respectively positioned around the bonding members so as to cover at least the bonding members and bonding regions between the bonding members and the bumps. Adjacent reinforcing resin members are spaced away from each other so as not to have contact with each other without being in contact with the semiconductor device. This semiconductor device mounted structure enhances the reliability of joints in impact resistance and makes it easy to repair it.
摘要:
A conductive paste includes a filler component and a flux component; the filler component including a first conductive filler and a second conductive filler having different melting points, and the melting point of the first conductive filler being higher than the melting point of the second conductive filler by 20° C. or more; the flux component including a first flux and a second flux having different melting points, the melting point of the first flux being higher than the melting point of the second flux, and the melting point of the first flux being higher than the melting point of the second conductive filler by 15° C. to 45° C.; and the melting point of the second flux being equal to or less than the melting point of the second conductive filler.