Patent ID: 7356790

Claim:
A layer number estimation device, for an electronic component mounting substrate on which an electronic component provided with a plurality of pins on an area from a peripheral side to a center side is mounted, which estimates a number of wiring layers required for drawing wirings out of electrodes connected with the pins to the peripheral side, the device comprising: bottleneck detection means for detecting a line, among a plurality of lines formed by connecting the electrodes with each other, where a number of electrodes located nearer the center side than the lines is greater comparing with a number of wirings capable of passing through the lines, as a bottleneck line with respect to one wiring layer; wiring layer adding means for disposing electrodes, among the electrodes located nearer the center side than the bottleneck line detected by the bottleneck detection means, which remain after subtracting the number of wirings capable of passing through the bottleneck line, on a next wiring layer as well; and repeating means for causing processing of the bottleneck line detection means and the wiring layer adding means to be performed to the next wiring layer.