Inductance-type rotation angle sensor, method of manufacturing the same, and intake control system for engine including the same sensor

摘要

An inductance-type rotation angle sensor includes: a stator formed by printing an annularly formed magnetic conductor and a receiving conductor placed adjacent to the magnetic conductor on a glass-epoxy-resin substrate; and a rotor having an excitation conductor attached thereto in a manner opposing the magnetic conductor. In the sensor, a thermosetting-resin covering layer, which is connected together through a periphery of the substrate and a through-hole included in this substrate, is formed on both front and back surfaces of the substrate by molding; a portion of the covering layer covering the magnetic conductor and the receiving conductor is formed as a thin thickness part which is thinner in thickness than a remaining portion of the covering layer; and the stator is buried in a thermoplastic-resin control housing with the thin thickness part being exposed to an outside. Accordingly, it is possible to provide an inductance-type rotation angle sensor which is capable of restraining the change that occurs in the plate thickness of the substrate due to temperature change, and which is capable of stabilizing the detection precision of the angle change of the rotor.