# US 2019/0170539 A1 · Inductive position detector > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2019/0170539 A1 - Document ID: US20190170539A1 - Status: Published application - Kind: A1 - Application number: 16/312,952 - Filed: 2016-08-16 - Published: 2019-06-06 - Earliest claimed: 2016-06-28 - Assignees: Zettlex (UK) Limited - Applicants: Zettlex (UK) Limited - Inventors: Mark Anthony Howard; Darran Kreit - Web page: https://patentgrep.com/patent/US20190170539A1 ## CPC - G01D 5/2208: {by influencing the self-induction of the coils} - G01D 5/2053: {by a movable non-ferromagnetic conductive element} - G01D 11/245: {Housings for sensors} - 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 ## Abstract An inductive detector is provided for measuring the relative position of bodies along a measurement path comprising: an inductive target arranged along the measurement path; a laminar antenna arranged facing a portion of the target; an electronics circuit arranged along the measurement path; wherein, the inductance of at least one winding in the antenna varies continuously in proportion to the relative position of target and antenna. ## Claims ### Claim at position 1 1-21. (canceled) ### Claim 22 An inductive position detector comprising a first and a second body, at least one of said bodies being displaceable relative to the other in a measurement direction along a measurement path, said first body comprising one or more antenna windings for transmitting and receiving signals; said first body further comprising an electronic circuit for energising said antenna windings for transmitting signals and for processing signals induced in said antenna windings; wherein said second body comprises a plurality of discrete target areas provided along said measurement path; said discrete target areas being either electrically conductive or magnetically permeable; whereby induced signals vary in accordance with the relative position of the first and second body; wherein said antenna windings and said electronic circuit for energising said antenna windings and for processing signals from said antenna windings are located adjacent to one another; said antenna windings and said electronic circuit being longitudinally arranged and spaced in said measurement direction; whereby they respectively overlap different regions of said plurality of discrete target areas. ### Claim 23 (depends on 22) A detector according to claim 22, wherein said electronic circuit is located in the same plane as said antenna windings. ### Claim 24 (depends on 22) A detector according to claim 22, wherein said first body and said second body are annular and configured to overlap one another, said one or more antenna windings being provided in a first section of said first body and said electronic circuit being provided in a second section of said first body; said second section being separate from said first section. ### Claim 25 (depends on 24) A detector according to claim 24, wherein said first body comprises a further section which is separate from said first and second sections; said further section comprising one or more further antenna windings. ### Claim 26 (depends on 25) A detector according to claim 25, wherein said first section and said further section are provided diametrically opposite one another with said second section being provided between said first and further section. ### Claim 27 (depends on 25) A detector according to claim 25, wherein said first body further comprises an insulating substrate and an electro-magnetic shielding layer; said insulating substrate being a carrier for said antenna windings; at least one fastener being provided to secure said substrate to said shielding layer; said fasteners being provided outside of said first section. ### Claim 28 (depends on 22) A detector according to claim 22, wherein said first body comprises at least two separate adjacent sets of antenna windings which overlap, in use, with at least two corresponding separate sets of target areas; each set of target areas forming a measurement path whereby two disparate measurement paths are provided adjacent to one another. ### Claim 29 (depends on 28) A detector according to claim 28, wherein the target areas of a first measurement path differ in configuration with respect to the target areas of a second measurement path. ### Claim 30 (depends on 22) A detector according to claim 22, wherein said discrete target areas form a periodic pattern of laminar conductive areas. ### Claim 31 (depends on 22) A detector according to claim 22, wherein said discrete target areas form a periodic pattern of magnetically permeable areas. ### Claim 32 (depends on 30) A detector according to claim 30, wherein said periodic pattern comprises areas whose width perpendicular to the measurement path varies continuously along the measurement path. ### Claim 33 (depends on 22) A detector according to claim 22, wherein said areas are circular areas. ### Claim 34 (depends on 22) A detector according to claim 22, wherein said areas are elliptical. ### Claim 35 (depends on 22) A detector according to claim 22, wherein said areas are rectangular. ### Claim 36 (depends on 22) A detector according to claim 22, wherein said areas are annular. ### Claim 37 (depends on 22) A detector according to claim 22, wherein said discrete areas are defined by two closed loops, one of which being located within the other. ### Claim 38 (depends on 37) A detector according to claim 37, wherein the inner loop varies in radius about its circumference. ### Claim 39 (depends on 22) A detector according to claim 22, wherein said areas are part of a periodically repeating shape. ### Claim 40 (depends on 22) A detector according to claim 22, wherein said areas are defined by a plurality of discrete windings, each of which are provided in series with a capacitor to form a plurality of discrete resonant circuits along the measurement path.