Patent ID: 6236325
Filing Date: 2001-05-22
Classification: G01D

Abstract:
A position detector, comprising:a scale unit including a stationary element and a movable element, said scale unit generating position pulses in accordance with a relative displacement between said stationary element and said movable element, said scale unit outputting said position pulses via a first cable having a first connector at an end portion thereof; anda controller for position detecting, said controller receiving said position pulses from said scale unit via said first cable, said controller calculating a relative position of said movable element to said stationary element based on said received position pulses,wherein said scale unit generates an alarm signal to notify an error associated with generating said position pulses when said error occurs, said first cable transfers said alarm signal to said first connector, and said first connector contains an irregularity informing means for performing an irregularity informing operation in response to said alarm signal output from said scale unit.