Patent ID: 6662345
Filing Date: 2003-12-09
Classification: G06F,H05K

Abstract:
A method for designing a printed-circuit board comprising the steps of:a. inputting beforehand data necessary for designing and thermally analyzing a printed-circuit board on which a component having a solder joint is mounted; b. thermally analyzing the printed-circuit board by simulating the heating of the printed-circuit board in a reflow furnace with use of the input data necessary for the thermal analysis; c. evaluating from a result of the thermal analysis whether or not there exists at least either one of an unmelted solder joint whose peak temperature does not reach a predetermined lower limit temperature at heating and an over-heated component whose temperature exceeds a predetermined upper limit temperature at heating; d. according to a result of the above evaluation, changing a design of a component having the unmelted solder joint and/or the over-heated component so that the temperature of the unmelted solder joint and/or the over-heated component is within a range from the lower limit temperature to the upper limit temperature; and e. outputting the result of change of the design.