Patent ID: 7241664

Claim:
A method of manufacturing functional elements by forming a plurality of functional elements each having a through-hole piercing a surface on a substrate, said method comprising the steps of: forming an alignment mark on a surface of the substrate in an area in which the functional elements are constituted and the through-hole is formed in an additional process; forming an anti-etching layer on a reverse surface of the substrate; providing on the reverse surface of the substrate a photomask having a pattern shape for forming the through-hole and a mark shape for positioning the alignment mark, the mark shape being located at a position corresponding to a region where the through-hole is formed on the reverse surface of the substrate and capable of being positioned to the alignment mark; forming an opening corresponding to the area and a portion corresponding to the mark shape by etching the anti-etching layer; and forming the through-hole by removing a portion, which is the through-hole, including the mark shape, from the substrate.