Patent ID: 7215113

Claim:
A position detecting apparatus for an actuator, comprising: a rotor in which plural magnets are provided on a predetermined pitch circle whose center is a center of a drive shaft, the plural magnets being provided at intervals of a predetermined angle; a coil which is provided so as to face the magnet such that a magnetic field is formed between the coil and the magnet; a shaft which is connected to the rotor through a movement conversion mechanism that converts rotational movement to linear movement, and which is linearly moved in response to rotational movement of the rotor, the rotational movement being caused by energizing the coil; and a sensor portion which detects a change in magnetic flux of the magnet, the change being caused by the rotational movement of the rotor, and which obtains an amount of linear movement of the shaft based on the detected change in the magnetic flux, wherein the magnets are buried in the rotor so as to be exposed on an end portion of the rotor, the end portion facing the sensor portion.