In a power window device an MCU detects motor torque values one by one when a window is opened and closed, compares the detected motor torque values with base values set to the travel regions and stops or reverses a motor determining that an object is pinched in the window when the former values exceed the latter values. In accordance with the invention the motion detector includes means for turning, aligning and locking the detector in any desired direction relative to the moving body with the help of the enclosure. The light receiver and the analyzing device detect the mura defect occurring in the repetitive pattern of the photomask. The actuator comprises a motor having a rotatable motor shaft, a gear assembly coupled with the motor shaft and rotatable with rotation of the motor shaft, and a rotatable drive shaft coupled with the gear assembly and the mirror housing for moving the mirror housing through the normal path of movement with rotation of the drive shaft.