Apparatus and method for magnetic sensor based surface shape analysis

• US 10,345,091 B2
• Filed: 09/18/2015
• Issued: 07/09/2019
• Est. Priority Date: 09/19/2014
• Status: Active Grant

• Current Assignee: Allegro Microsystems Incorporated (Sanken Electric Company Limited)
• Original Assignee: Crocus Technology S.A.
• Inventors: Cambou, Bertrand F., Ristic, Ljubisa, Wu, Jian, Lee, Douglas, Stokes, Ted, Mackay, Ken
• Primary Examiner(s): Koval, Melissa J
• Assistant Examiner(s): Nguyen, Trung
• Application Number:
  US14/859,117
• Publication Number:
  US 20160084674A1
• Time in Patent Office: 1,390 Days
• Field of Search: 324200, 324244-263, 324500, 324524, 32420713-20714, 324529, 324530, 32475016
• CPC Class Codes: G01B 7/24 using change in magnetic properties
• CPC Class Codes: G01B 7/287 using a plurality of fixed, simultaneously operating transducers G01B7/293 takes precedence
• CPC Class Codes: G01L 5/00 Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes

Abstract

A device has magnetic sensors and magnets in an array on a flexible substrate. Each magnetic sensor is sensitive to immediately proximate magnets. At least one controller evaluates magnetic sensor signals from the magnetic sensors produced in response to deformation of the flexible substrate.

Claims

1. A device, comprising;

magnetic sensors and magnets in an array on a flexible substrate, wherein each magnetic sensor is sensitive to laterally offset proximate magnets, and

at least one controller to evaluate magnetic sensor signals from the magnetic sensors produced in response to deformation of the flexible substrate to characterize surface shape of the flexible substrate, wherein the at least one controller collects reference magnetic sensor signals when the flexible substrate is flat, first polarity magnetic sensor signals in response to deformation of the flexible substrate in a first direction and second polarity magnetic sensor signals in response to deformation of the flexible substrate in a second direction.

2. The device of claim 1 wherein the reference magnetic sensor signals are zero or set at a determined value.

3. The device of claim 1 wherein the first polarity magnetic sensor signals and the second polarity magnetic sensor signals are each a function of an angle characterizing the deformation of the flexible substrate.

4. The device of claim 1 wherein the magnetic sensors and magnets include pairs comprising one magnetic sensor and one magnet.

5. The device of claim 1 wherein the magnetic sensors and magnets include groups defined by triangles with one magnet and three magnetic sensors.

6. The device of claim 1 wherein the magnetic sensors and magnets include groups defined by triangles with one magnetic sensor and three magnets.

7. The device of claim 1 wherein the magnetic sensors and magnets include groups defined by squares with one magnet and four magnetic sensors.

8. The device of claim 1 wherein the magnetic sensors and magnets include groups defined by squares with one magnetic sensor and four magnets.

9. The device of claim 1 wherein the magnetic sensors and magnets include groups defined by honeycombs with one magnet and six magnetic sensors.

10. The device of claim 1 wherein the magnetic sensors and magnets include groups defined by honeycombs with one magnetic sensor and six magnets.

11. The device in claim 1 wherein magnetic sensors and magnets are in different planes within the flexible substrate.

12. The device of claim 1 positioned on a display.

13. The device of claim 1 positioned on a game console.

14. The device of claim 1 positioned on an airplane.

15. The device of claim 1 positioned on an automobile.

16. A device, comprising;

a flexible substrate supporting magnetic sensors and magnetization lines that carry currents inducing selective magnetization of the magnetic sensors; and

one or more controllers to collect magnetic sensor signals from the magnetic sensors, wherein the one or more controllers collect reference magnetic sensor signals when the flexible substrate is flat, first polarity magnetic sensor signals in response to deformation of the flexible substrate in a first direction and second polarity magnetic sensor signals in response to deformation of the flexible substrate in a second direction, wherein the one or more controllers.

17. The device of claim 16 wherein the reference magnetic sensor signals are zero or below some minimum signal threshold.

18. The device of claim 16 wherein the first polarity magnetic sensor signals and the second polarity magnetic sensor signals are each a function of the currents inducing selective magnetization, an angle characterizing the deformation of the flexible substrate and the distance between the magnetic sensors and magnetization lines.