Phase discrimination type electrostatic capacity detector

Claim 1

A phase discrimination type electrostatic capacity detector comprising a one-side electrode plate composed of a transmitting electrode and of a receiving electrode, another-side electrode plate having a coupling electrode and disposed relatively movably with respect to said one-side electrode plate in a confronting relation with the same, a power supply connected to said transmitting electrode, and a detector circuit connected to said receiving electrode, characterized in that said one-side electrode plate having a substrate formed of a hard-workable material is partitioned on one of the surfaces of the substrate into first and second hierarchy layers by an electrical insulating layer, a plurality of transmitting electrode elements, which constitute said transmitting electrode, are disposed in said second hierarchy layer and allowed to penetrate at ends thereof through said electrical insulating layer and extend into said first hierarchy layer, said transmitting electrode elements of the same phase and disposed adjacent to each other are interconnected through coupling leads obliquely oriented with respect to said transmitting electrode elements and in series from the transmitting electrode elements at one side to the transmitting electrode elements at the other side in said first hierarchy layer, and said respective transmitting electrode elements of the same phase are supplied with an electric signal of said same phase from said power supply through the respective coupling leads.