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AssigneeSankyo Seisakusho Co.
InventorsKazuhisa Katsumata, Naoyuki Takahashi
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The present invention provides a method for detecting a positional change amount due to a movement of a moving body by reading, with a sensor, a plurality of gradations disposed along the direction of the movement. The method includes: a step for taking, as one period, one gradation among the plurality of gradations and acquiring a pseudo sinusoidal signal in response to the positional change amount; a step for executing a Fourier transform on the pseudo sinusoidal signal within the range of at least one gradation, and calculating, from the spectral intensity of each frequency component obtained by the Fourier transform, the signal intensity of a fundamental wave component and the signal intensity of at least one harmonic component; a step for calculating a gain corresponding to each of the at least one harmonic component by dividing each signal intensity of the at least one harmonic component by the signal intensity of the fundamental wave component; and a step for detecting the positional change amount by subtracting, from the pseudo sinusoidal signal, each harmonic component multiplied by a corresponding gain.
A method of detecting a positional change amount due to a movement of a moving body by reading, with a sensor, a plurality of gradations disposed along the direction of the movement, the method comprising:
A positional detecting device comprising a moving body, a graduation scale having a plurality of graduations disposed along the direction of a movement of the moving body, a sensor of outputting a pseudo sine wave signal depending to the positional change amount due to the movement of the moving body, wherein the pseudo sine wave signal is set such that the amount of one graduation of the plurality of graduations is one cycle, and a control unit connected to the sensor and comprising a signal processing unit and a storage unit;
A positional detecting device comprising a moving body, a graduation scale having a plurality of graduations disposed along the direction of a movement of the moving body, a sensor of outputting a pseudo sine wave signal depending to the positional change amount due to the movement of the moving body, wherein the pseudo sine wave signal is set such that the amount of one graduation of the plurality of graduations is one cycle, and a control unit connected to the sensor and comprising a signal processing unit and a storage unit;
Dependencies are inferred from the claim text.