# US 2019/0376779 A1 · Magnetic position sensor > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2019/0376779 A1 - Document ID: US20190376779A1 - Status: Published application - Kind: A1 - Application number: 16/472,328 - Filed: 2016-12-22 - Published: 2019-12-12 - Earliest claimed: 2016-12-22 - Assignees: Hamlin Electronics (Suzhou) Co. Ltd. - Applicants: Hamlin Electronics (Suzhou) Co. Ltd. - Inventors: Rex LIU; Bens XIE - Web page: https://patentgrep.com/patent/US20190376779A1 ## CPC - G01B 7/003: {for measuring position, not involving coordinate determination (coordinate measuring G01B7/004)} - B60N 2/06: slidable (B60N2/12 {, B60N2/2209} take precedence) - B60N 2/90: Details or parts not otherwise provided for - G01D 5/147: {influenced by the movement of a third element, the position of Hall device and the source of magnetic field being fixed in respect to each other} - B60R 21/01554: {Seat position sensors} - H03K 2017/9706: {Inductive element} - G01B: MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS - B60N: SEATS SPECIALLY ADAPTED FOR VEHICLES; VEHICLE PASSENGER ACCOMMODATION NOT OTHERWISE PROVIDED FOR - G01D: MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR - B60R: VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR - H03K: PULSE TECHNIQUE (measuring pulse characteristics G01R; modulating sinusoidal oscillations with pulses H03C; transmission of digital information H04L; discriminator circuits detecting phase difference between two signals by counting or integrating cycles of oscillation H03D3/04; automatic control, starting, synchronisation or stabilisation of generators of electronic oscillations or pulses where the type of generator is irrelevant or unspecified H03L; coding, decoding or code conversion, in general H03M) ## Abstract A disclosed apparatus includes a sensor housing. First and second magnets may be disposed in the sensor housing. A magnetic field sensor may be disposed between the first and second magnets. A sensor element may be positioned in a vicinity of the sensor housing, the sensor element to cause a magnetic field between the first and second magnets to substantially bypass the magnetic field sensor. The sensor housing may be coupled to a movable rail. The sensor element may be coupled to a fixed rail. The movable rail may be engaged with the fixed rail and movable relative to the fixed rail. ## Claims ### Claim 1 An apparatus, comprising: a sensor housing; first and second magnets disposed in the sensor housing; a magnetic field sensor disposed between the first and second magnets; and a sensor element positioned in a vicinity of the sensor housing, the sensor element to cause a magnetic field between the first and second magnets to substantially bypass the magnetic field sensor. ### Claim 2 (depends on 1) The apparatus according to claim 1, wherein the sensor element is a switching plate made of ferromagnetic material. ### Claim 3 (depends on 2) The apparatus according to claim 2, wherein the ferromagnetic material is a material including at least one of iron, nickel, or cobalt. ### Claim 4 (depends on 1) The apparatus according to claim 1, wherein the sensor element is a switching plate that has a width at least as great as a distance between the first and second magnets. ### Claim 5 (depends on 4) The apparatus according to claim 4, wherein the width of the switching plate is greater than the distance between the first and second magnets. ### Claim 6 (depends on 1) The apparatus according to claim 1, wherein the sensor housing is disposed on a movable seat rail associated with a vehicular seat and the sensor element is disposed on a fixed seat rail engaged with the movable seat rail. ### Claim 7 (depends on 6) The apparatus according to claim 6, wherein the sensor element is a switching plate made of ferromagnetic material. ### Claim 8 (depends on 7) The apparatus according to claim 7, wherein the ferromagnetic material is a material including at least one of iron, nickel, or cobalt. ### Claim 9 (depends on 1) The apparatus according to claim 1, wherein the magnetic field sensor is a magnet effect sensor. ### Claim 10 (depends on 9) The apparatus according claim 9, wherein the magnet effect sensor is a Hall-effect sensor, Anisotropic Magneto-Resistive sensor, Giant magnetoresistance sensor, or Tunnel magnetoresistance sensor. ### Claim 11 An apparatus, comprising: a fixed rail; a movable rail engaged to the fixed rail, the movable rail movable relative to the fixed rail; a sensor housing including a plurality of magnets and a magnetic field sensor, the sensor housing coupled to the fixed rail or the movable rail; and a switching plate coupled to the fixed rail or movable rail that does not include the sensor housing, the switching plate to cause to cause a magnetic field between the first and second magnets to substantially bypass the magnetic field sensor. ### Claim 12 (depends on 11) The apparatus according to claim 11, wherein the movable rail is coupled to a vehicular seat. ### Claim 13 (depends on 11) The apparatus according to claim 11, wherein the switching plate is made of ferromagnetic material. ### Claim 14 (depends on 11) The apparatus according to claim 11, wherein the switching plate is coupled to the fixed rail and the sensor housing is coupled to the movable rail. ### Claim 15 (depends on 11) The apparatus according to claim 11, wherein the switching plate is coupled to the movable rail and in the sensor housing is coupled to the fixed rail. ### Claim 16 (depends on 11) The apparatus according to claim 11, wherein the magnetic field sensor is positioned between the plurality of magnets. ### Claim 17 (depends on 11) The apparatus according to claim 11, wherein the magnetic field sensor is disposed between the plurality of magnets within the sensor housing. ### Claim 18 (depends on 11) The apparatus according to claim 11, wherein the magnetic field sensor is a magnet effect sensor. ### Claim 19 (depends on 18) The apparatus according claim 18, wherein the magnet effect sensor is a Hall-effect sensor, Anisotropic Magneto-Resistive sensor, Giant magnetoresistance sensor, or Tunnel magnetoresistance sensor.