A power-down biasing circuit including a current source connected to a drain of a first NMOS transistor through a first switch. The output amplitude control step performs a constant amplitude control to control an amplitude value of the pulse output so that the amplitude value becomes equal to a set amplitude value. The housing can have at least one engagement pin for selective positioning wherever the receiving holes are located. A transfer mask which is manufactured by making use of this substrate is featured in that it is possible to prevent a transfer pattern from being cracked or destroyed due to stress from the silicon oxide film on the occasion of manufacturing the transfer mask, thereby providing a defect-free transfer mask. The object can then be folded along scored fold lines to assemble it into a three-dimensional structure.