Patent ID: 7946555

Claim:
A rotational angle sensor comprising: a magnetic detection device including a sensing section constructed to detect a change of a magnetic field produced by at least two magnets attached to a rotary member; a protective member constructed to protect at least the sensing section of the magnetic detection device; and a housing member molded integrally with the magnetic detection device and the protective member by an insertion molding process, such that the magnetic detection device and the protective member are embedded within the housing member; wherein the sensing section has at least one projection, and the protective member has at least one engaging recess engaging with the at least one projection, such that the sensing section is positioned relative to the protective member; and wherein the sensing section has a first projection and a second projection disposed on opposite sides of the sensing section, and the protective member has a first engaging recess and a second engaging recess for engaging the first projection and the second projection, respectively.