Patent ID: 11453076

Abstract:
A laser soldering technique prevents generation of scorching of a substrate or heat-susceptible components in the surroundings, residues, etc. A method includes adjusting a height of the laser soldering device 1 to a position at which laser light has a preset irradiation diameter D1 larger than a diameter of a solder droplet S, irradiating the solder droplet S with the laser light to heat the solder droplet S to a temperature at which a flux solvent component volatilizes and a solder powder does not melt; adjusting the height of the laser soldering device to a position at which the laser light has a preset irradiation diameter D2 smaller than the diameter of the solder droplet S, and irradiating the solder droplet S with the laser light to heat the solder droplet S to a temperature at which the solder powder melts, and performing soldering.