Encoder
First Claim
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1. An encoder comprising:
- a scale; and
a detection head which is relatively displaceable with respect to the scale, wherein the detection head includesa plurality of detection array portions that are arranged in a direction along which the detection head is relatively displaceable, each detection array portion comprising a plurality of detection elements,a processor configured to calculate position signals indicating a position of the detection head from output signals output from the detection array portions, and to combine the position signals with one another and determine the position of the detection head with respect to the scale, andwherein the processor is configured to perform weighting of each position signal calculated by the processor according to a level of the output signal from the detection array portions, and to average the weighted position signals of each of the detection array portions.
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Abstract
A detection head includes a plurality of detection array portions that are arranged in a direction along which the head is relatively displaceable. Position signals indicating a position of the detection head are calculated from output signals output from the detection array portions. In order to combine the position signals with one another and determine the position of the detection head with respect to the scale, weighting according to a level of the output signal is performed on the position signal of each of the detection array portions, and the weighted position signals are averaged.
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Citations
4 Claims
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1. An encoder comprising:
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a scale; and a detection head which is relatively displaceable with respect to the scale, wherein the detection head includes a plurality of detection array portions that are arranged in a direction along which the detection head is relatively displaceable, each detection array portion comprising a plurality of detection elements, a processor configured to calculate position signals indicating a position of the detection head from output signals output from the detection array portions, and to combine the position signals with one another and determine the position of the detection head with respect to the scale, and wherein the processor is configured to perform weighting of each position signal calculated by the processor according to a level of the output signal from the detection array portions, and to average the weighted position signals of each of the detection array portions. - View Dependent Claims (2, 3, 4)
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Specification