Cross-coil type indicating instrument
AssigneeYazaki Corporation
InventorHideo Chikasue
Life of this patent
Estimating the term…
Abstract
A cross-coil type indicating instrument has a permanent magnet arranged in a plurality of coils that are wound mutually crossed and indicates the value corresponding to a physical quantity detected by a sensor through turning the permanent magnet by supplying to the coil the electrical signal that corresponds to the sensor output. Two of the plurality of coils are wound so as to generate respectively magnetic fields which have mutually opposite direction, and the currents supplied to the coil are independently controlled by first and second control circuit, wherein the first control circuit comprises a input circuit and a operating circuit for low temperature and the second circuit comprises a input circuit and a operating circuit for high temperatures.
Claims11
A cross-coil type indicating instrument having a sensor having an output, a magnet, a plurality of mutually crossed coils wound around said magnet and connected to said output of said sensor, said instrument indicating a value of a detected physical quantity, as for example temperature, by means of a rotation of the magnet in response to an electrical signal that corresponds to the sensor output to the coils, comprising:
- (i) a first coil which is wound so as to generate a predetermined magnetic field H.sub.1 and to be continuously excited,
- (ii) a second coil which is wound so as to generate a magnetic field H.sub.2 that crosses the magnetic field H.sub.1,
- (iii) a third coil which is wound so as to generate a magnetic field H.sub.3 that is approximately in the opposite direction to the magnetic field H.sub.2,
- (iv) a first control circuit having input terminals connected to said sensor and an output terminal connected to said second coil, for controlling only the current flow supplied to the second coil in accordance with a magnitude of the physical quantity detected by the sensor, said first control circuit controlling the current flow in such a manner that a magnitude of the current flow supplied to said second coil decreases with increase in the magnitude of the physical quantity detected until the magnitude of the physical quantity reaches a first reference value, and the current flow is interrupted after the magnitude of the physical quantity exceeds the first reference value, and
- (v) a second control circuit having input terminals connected to said sensor and having an output terminal connected to said third coil, for controlling only the current flow supplied to the third coil in accordance with the magnitude of the physical quantity detected by the sensor, said second control circuit controlling the current flow in such a manner that the current flow is not supplied to the third coil until an increasing magnitude of the physical quantity reaches a second reference value being greater than the first reference value, and after the magnitude of the physical quantity exceeds the second reference value a current flow whose magnitude increases with increase in the magnitude of the physical quantity, is supplied to said third coil.
A cross-coil type indicating instrument having a sensor having an output, a magnet, a plurality of mutually crossed coils wound around said magnet and connected to said output of said sensor, said instrument indicating a value of a detected physical quantity, as for example temperature, by means of a rotation of the magnet in response to an electrical signal that corresponds to the sensor output to the coils, comprising:
- (a) a first coil wound so as to generate a magnetic field H.sub.1 that has magnitude and direction constant in time;
- (b) a second coil would so as to generate a magnetic field H.sub.2 that crosses the magnetic field H.sub.1 ;
- (c) a third coil wound so as to generate a magnetic field H.sub.3 that is approximately in the opposite direction to that of the magnetic field H.sub.2 ;
- (d) a first control circuit, having input terminals connected to the sensor, and having an output terminal connected to said second coil, for controlling only the current flow supplied to the second coil in accordance with a magnitude of the physical quantity detected by the sensor, said first control circuit controlling the current flow in such a manner that a magnitude of the magnetic field H.sub.2 decreases with increase in the magnitude of the physical quantity detected until the magnitude of the physical quantity reaches a first reference value, and the current flow is interrupted after the magnitude of the physical quantity exceeds the first reference value;
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- (e) a second control circuit, having input terminals connected to the sensor, and having an output terminal connected to said third coil, for controlling only the current flow supplied to the third coil in accordance with the magnitude of the physical quantity detected by the sensor, said second control circuit controlling the current flow in such a manner that the current flow is not supplied to the third coil until an increasing magnitude of the physical quantity reaches a second reference value being greater than the first reference value, and after the magnitude of the physical quantity exceeds the second reference value a current flow is supplied to said third coil so that the magnitude of the magnetic field H.sub.3 increases with increase in the magnitude of the physical quantity.
A cross-coil type indicating instrument having a sensor having an output, a magnet, a plurality of mutually crossed coils wound around said magnet and connected to said output of said sensor, said instrument indicating a value of a detected physical quantity, as for example temperature by means of a rotation of the magnet in response to an electrical signal that corresponds to the sensor output to the coils, comprising:
- (i) a first coil which is would so as to generate a predetermined magnetic field H.sub.1 and to be continuously excited;
- (ii) a second coil which is would so as to generate a magnetic field H.sub.2 that crosses the magnetic field H.sub.1 ;
- (iii) a third coil which is would so as to generate a magnetic field H.sub.3 that is approximately in the opposite direction to the magnetic field H.sub.2 ;
- (iv) a first control circuit for controlling only the current flow supplied to the second coil in accordance with the magnitude of the physical quantity detected by the sensor, said first control circuit controlling the current flow in such a manner that a magnitude of the current flow supplied to said second coil decreases with increase in the magnitude of the physical quantity detected until the magnitude of the physical quantity reaches a first reference value and the current flow is interrupted after the magnitude of the physical quantity exceeds the first reference value;
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- (v) a second control circuit for controlling only the current flow supplied to the third coil in accordance with the magnitude of the physical quantity detected by the sensor, said second control circuit controlling the current flow in such a manner that the current flow is not supplied to the third coil until an increasing magnitude of the physical quantity reaches a second reference value, and after the magnitude of the physical quantity exceeds the second reference value a current flow whose magnitude increases with increase in the magnitude of the physical quantity, is supplied to said third coil;
- wherein said sensor is a thermistor and said first and second control circuits have a common input circuit which takes out a voltage between both ends of the thermistor as an output of the thermistor.
Dependencies are inferred from the claim text.