Measuring device with magneto-resistive electrodes, and measuring method
First Claim
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1. Dimension-measuring device comprising:
- a scale provided with a series of magnetized areas, a sensor capable of being displaced parallel and opposite the scale and provided with a network of magneto-resistive electrodes connected so as to constitute at least one measuring bridge, a circuit for electrically feeding said at least one measuring bridge and to supply at least one value dependent on the at least one output signal to said at least one measuring bridge, said at least one measuring bridge being fed according to a first mode enabling the displacements of said sensor relative to said scale to be detected with a reduced electric consumption through said magneto-resistive electrodes, then according to at least a second mode enabling a finer measuring with a higher electric consumption in response to the detection of an action of said device, wherein the voltage applied to said at least one measuring bridge in said first mode is lower than the voltage applied to said at least one measuring bridge in said second mode, and the voltage applied to said at least one measuring bridge in said first mode is sufficient to allow displacement of said sensor with respect to said scale.
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Abstract
Electronic circuit for dimension-measuring device with magneto-resistive electrodes supplying at least one feed voltage for feeding a network of magneto-resistive electrodes and a measuring circuit comprising two differential inputs connected to the network. The measuring circuit uses a rough counter and a fine interpolation circuit for determining from the two sinusoidal input signals received the position of the sensor along the scale. The feed circuit periodically reduces the supplied electric feed voltage so as to temporarily lessen the dissipation of energy in the magneto-resistive electrodes.
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Citations
22 Claims
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1. Dimension-measuring device comprising:
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a scale provided with a series of magnetized areas, a sensor capable of being displaced parallel and opposite the scale and provided with a network of magneto-resistive electrodes connected so as to constitute at least one measuring bridge, a circuit for electrically feeding said at least one measuring bridge and to supply at least one value dependent on the at least one output signal to said at least one measuring bridge, said at least one measuring bridge being fed according to a first mode enabling the displacements of said sensor relative to said scale to be detected with a reduced electric consumption through said magneto-resistive electrodes, then according to at least a second mode enabling a finer measuring with a higher electric consumption in response to the detection of an action of said device, wherein the voltage applied to said at least one measuring bridge in said first mode is lower than the voltage applied to said at least one measuring bridge in said second mode, and the voltage applied to said at least one measuring bridge in said first mode is sufficient to allow displacement of said sensor with respect to said scale. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21)
a terminal being fed with a maximum potential and the other with a minimal potential when said at least one measuring bridge is fed, the two terminals being fed with an intermediate potential when the applied voltage is reduced. -
21. Measuring device according to claim 20, wherein said measuring bridge is connected to said external terminals through at least one resistance, at least one switch enabling at least one of said resistances to be short-circuited when the maximum potential must be applied to said measuring bridges.
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22. Dimension-measuring device comprising:
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a scale provided with a series of magnetized areas, a sensor capable of being displaced parallel and opposite the scale and provided with a network of magneto-resistive electrodes connected so as to constitute at least one measuring bridge, a circuit for electrically feeding said at least one measuring bridge and to supply at least one value dependent on the at least one output signal to said at least one measuring bridge, said at least one measuring bridge being fed according to a first mode enabling the displacements of said sensor relative to said scale to be detected with a reduced electric consumption through said magneto-resistive electrodes, then according to at least a second mode enabling a finer measuring with a higher electric consumption in response to the detection of an action of said device, wherein the voltage applied to said at least one measuring bridge in said first mode is lower than the voltage applied to said at least one measuring bridge in said second mode, and the voltage applied to said at least one measuring bridge in said first mode is sufficient to allow detecting a displacement of said sensor with respect to said scale, said circuit further comprising a trigger signal generator, for detecting an action on said dimension-measuring device when in said first mode, said circuit being arranged to switch to said second mode in response to a signal from said trigger signal generator.
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Specification
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Current AssigneeTesa Sa (Hexagon AB)
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Original AssigneeBrown & Sharpe Tesa Sa (Hexagon AB)
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InventorsJordil, Pascal
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Primary Examiner(s)Le, N.
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Assistant Examiner(s)KINDER, DARRELL D
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Application NumberUS10/330,999Publication NumberTime in Patent Office480 DaysField of Search324/207.16, 324/207.17, 324/207.2, 324/207.21, 324/207.24, 337/08, 337/84, 338/19, 338/20US Class Current324/207.21CPC Class CodesG01B 3/205 provided with a counter for...G01B 7/02 for measuring length, width...G01D 5/145 influenced by the relative ...
