Importance

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Abstract

A position detecting apparatus, which detects a relative position, relative to a base member, of a movable member which relatively moves in a movement direction relative to the base member includes: a scale formed on one of the two members, the scale including first/second pattern arrays respectively including first/second patterns arranged in first/second cycle in the movement direction; an obtaining unit mounted on the other, and configured to obtain signals including first/second signals based on the first/second pattern arrays respectively; a position calculator configured to calculate an absolute position of the movable member; a determinator configured to determine whether the absolute position calculated by the position calculator is correct; and a memory configured to store an information for determining whether the absolute position is correct, wherein the determinator determines whether the absolute position calculated by the position calculator is correct based on the information stored in the memory.

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First Claim