OPTICAL SEMICONDUCTOR BARE CHIP, PRINTED WIRING BOARD, LIGHTING UNIT AND LIGHTING DEVICE

摘要

A wiring board used for mounting an LED bare chip capable of firmly bonding the LED bare chip and improving yield. In a printed wiring board 2 , a distance D between wiring patterns 81 and 85 disposed so as to oppose each other is the smallest at a position nearest to a center point (G) of an LED chip 14 disposed at a designed location, and increases with an increasing distance from the point G. In addition, pattern edges 83 and 87 of the wiring patterns 81 and 85 recede in the direction of widening the distance D as a distance from the center point G increases with respect to electrode edges 148 and 149 of the LED chip 14.