Electronic circuit and method for a dimension-measuring device
First Claim
1. An electronic circuit for a dimension-measuring device, said electronic circuit having magnetoresistive electrodes, wherein the improvement comprises:
- an electronic feed circuit having a battery for providing power, and said circuit supplying at least one feed voltage intended to feed a network of said magnetoresistive electrodes and said network includes at least four of said magnetoresistive electrodes being grouped as a set, a measuring circuit having at least one input intended to be connected to said network, said measuring circuit supplying at least one magnitude dependent upon the resistance of at least one of said magnetoresistive electrodes of said network, and means for causing said electronic feed circuit periodically to modify the electric feed voltage for temporarily lessening a dissipation of energy in said magnetoresistive electrodes of said network.
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Accused Products
Abstract
The electronic circuit (3) comprises an electric feed circuit (42) supplying at least one feed voltage (EPEN) intended to feed a network of magnetoresistive electrodes (100) and a measuring circuit (30-39) including two differential inputs (C, C′, S, S′) connected to the network. The measuring circuit uses a rough counter and a fine interpolation circuit to determine the position of the sensor along the scale on the basis of the two sinusoidal input signals received. The feed circuit periodically reduces the electric feed voltage supplied so as temporarily to lessen the dissipation of energy in the magnetoresistive electrodes.
23 Citations
30 Claims
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1. An electronic circuit for a dimension-measuring device, said electronic circuit having magnetoresistive electrodes, wherein the improvement comprises:
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an electronic feed circuit having a battery for providing power, and said circuit supplying at least one feed voltage intended to feed a network of said magnetoresistive electrodes and said network includes at least four of said magnetoresistive electrodes being grouped as a set, a measuring circuit having at least one input intended to be connected to said network, said measuring circuit supplying at least one magnitude dependent upon the resistance of at least one of said magnetoresistive electrodes of said network, and means for causing said electronic feed circuit periodically to modify the electric feed voltage for temporarily lessening a dissipation of energy in said magnetoresistive electrodes of said network. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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19. A dimension-measuring device comprising:
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a scale provided with a series of magnetized zones, a sensor capable of moving parallel to and opposite said scale and provided with a network of magnetoresistive electrodes, and said network includes at least four of said magnetoresistive electrodes being grouped as a set, an electric circuit having a battery for providing power, and said circuit feeding said network, and a measuring circuit supplying at least one magnitude dependent upon the resistance of at least one of said magnetoresistive electrodes when said network is powered, said electric feed circuit periodically reducing the electric feed of said network for temporarily lessening the dissipation of energy in said magnetoresistive electrodes. - View Dependent Claims (20, 21, 22, 23, 24, 25, 26)
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27. A method of dimension measuring by means of a magnetoresistive measuring device comprising a scale provided with a series of magnetized zones and a sensor capable of moving parallel to and opposite the scale and provided with a network of magnetoresistive electrodes connected to constitute two Wheatstone bridges, comprising the following steps:
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feeding the Wheatstone bridges with feed voltages, determining the position of the sensor along the scale with the aid of two dephased signals received at the outputs of the Wheatstone bridges, and periodically reducing the feeding of the measuring bridges for temporarily lessening the dissipation of energy in the magnetoresistive electrodes. - View Dependent Claims (28, 29)
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30. A dimension-measuring device comprising:
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a scale provided with a series of magnetized zones, a sensor capable of moving parallel to and opposite the scale and provided with a network of magnetoresistive electrodes connected so as to constitute at least one measuring bridge, an electric feed circuit of said at least one measuring bridge, and a measuring circuit supplying at least one magnitude dependent upon the resistance of at least one of the magnetoresistive electrodes when said at least one measuring bridge is powered, said measuring circuit having a plurality of control registers, and said at least one measuring bridge being alternately powered by said electric feed circuit, so as to lessen during at least one interval of limited duration the dissipation of energy in said magnetoresistive electrodes.
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Specification