Patent ID: 7847211

Claim:
A light radiating conditions selecting method comprising: a) entering, via an input device, at least any one item of information with respect to i) a component; ii) a board on which the component is soldered, the board having pads and wiring patterns including wiring patterns making contact with the pads on a surface thereof; and iii) solder for soldering the component; b) calculating heat capacity of the board according to the information of the board, by a calculator; c) determining light radiating conditions by the calculator, according to the entered information via the input device, the calculated heat capacity and at least any one of databases stored in a storage with respect to light radiation power and light radiation time for soldering; and d) outputting the light radiation conditions determined by the calculator, wherein calculating the heat capacity includes the steps of: defining a range including the wiring patterns and the board around the pads; and calculating the heat capacity disposed within the range with respect to drilled hole area, a lead cross section area, a wiring pattern area, a pad area, and a plated area in a through hole, when calculating the heat capacity with regard to the wiring patterns.