Position Detector
First Claim
1. A position detector provided with either a permanent magnet or Hall elements mounted on a moving object which moves along a fixed path of movement, with the other of two, the permanent magnet and the Hall elements, mounted on the fixed path of movement of the moving object, and detecting a voltage output from each of the Hall elements on the basis of an electromotive force induced in the Hall element in accordance with a facing position between the permanent magnet and the Hall element in order to detect the position of the moving object, the position detector comprising,a comparison unit comparing a voltage value supplied from the Hall element with a threshold, outputting a detection signal when the voltage value exceeds the threshold for detection of a position of the moving object from a position in which the detection signal is output, and comprising a variable controlling unit for variably controlling the threshold.
1 Assignment
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Accused Products
Abstract
A position detector can correct a position for detecting a moving object without changing a physical location of a moving mechanism, a Hall element and/or the like. Either a permanent magnet 19 or Hall elements 16a, 17a, 17b, 17c is mounted on a moving object 3 moving along a fixed movement path, and the other of them is mounted on the fixed movement path of the moving object 3. A voltage output from each Hall element is detected based on an electromotive force induced in the Hall element in accordance with a facing position between the permanent magnet and the Hall element, for detection of the position of the moving object. A comparison unit a2 outputs a detection signal for the moving object when the voltage value output from the Hall element exceeds a threshold, and comprises a variable controlling unit R for variably controlling the threshold.
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Citations
4 Claims
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1. A position detector provided with either a permanent magnet or Hall elements mounted on a moving object which moves along a fixed path of movement, with the other of two, the permanent magnet and the Hall elements, mounted on the fixed path of movement of the moving object, and detecting a voltage output from each of the Hall elements on the basis of an electromotive force induced in the Hall element in accordance with a facing position between the permanent magnet and the Hall element in order to detect the position of the moving object, the position detector comprising,
a comparison unit comparing a voltage value supplied from the Hall element with a threshold, outputting a detection signal when the voltage value exceeds the threshold for detection of a position of the moving object from a position in which the detection signal is output, and comprising a variable controlling unit for variably controlling the threshold.
Specification