Patent ID: 8230577

Claim:
A method of making a sensing unit having: a substrate formed with a recessed portion; a spring portion having a support portion provided on said substrate and a flat coil-shaped movable portion supported by said support portion so as to be capable of floating relative to said substrate; and a sensor portion provided on said movable portion of said spring portion, for detecting displacement in said movable portion and transmitting a signal relating to said displacement via said spring portion, said method comprising the steps of: preparing the substrate on which a first region for forming said movable portion of said spring portion is lower than a second region for forming said support portion; burying said first region in a resist layer such that said substrate is made flat; forming a plating layer that is to become said spring portion such that a part that is to become said movable portion has a flat coil-shape and is positioned on said resist layer in said first region and a part that is to become said support portion is positioned in said second region; forming said sensor portion in said part of said plating layer that is to become said movable portion; and removing said resist layer.