Position detecting apparatus generating periodic detection signals having equal third and fifth harmonic components
AssigneeOkuma Corporation
InventorsAtsushi Ieki, Yasukazu Hayashi, Keiji Matsui
Life of this patent
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Abstract
A displacement detecting device generates first and second periodic signals in accordance with a displacement of a relatively movable object. The first and second periodic signals have differing phases relative to each other and each include a third harmonic component and a fifth harmonic component which are approximately equal to each other. The third and fifth harmonic components are equalized by setting a distance between first and second gratings of the position detection device. By equalizing the third and fifth harmonic components of the periodic detection signals, detection errors are reduced.
Claims5
A position detection apparatus comprising:
- displacement detecting means for generating first and second periodic signals in accordance with a displacement of a relatively movable object, said first and second periodic signals differing in phase relative to each other and each including a third harmonic component and a fifth harmonic component which are approximately equal to one another;
- positional data generating means for processing said first and second periodic signals to obtain and output corresponding positional data denoting a relative position of relatively movable object.
Dependencies are inferred from the claim text.