Method of sensing sliding by hall sensor and sensing system using the same

• US 9,612,134 B2
• Filed: 03/05/2014
• Issued: 04/04/2017
• Est. Priority Date: 08/29/2013
• Status: Active Grant

• Current Assignee: Magnachip Semiconductor Limited (Magnachip Semiconductor)
• Original Assignee: Magnachip Semiconductor Limited (Magnachip Semiconductor)
• Inventors: Park, Seung-hwan, Jin, Hyung-nam
• Primary Examiner(s): Hollington, Jermele M
• Application Number:
  US14/198,165
• Publication Number:
  US 20150061648A1
• Time in Patent Office: 1,126 Days
• CPC Class Codes: G01B 7/003 for measuring position, not involving coordinate determination coordinate measuring G01B7/004
• CPC Class Codes: G01B 7/14 for measuring distance or clearance between spaced objects or spaced apertures G01B7/30 takes precedence
• CPC Class Codes: G01D 5/145 influenced by the relative movement between the Hall device and magnetic fields see G01R33/06
• CPC Class Codes: G01R 33/07 Hall effect devices

Abstract

A method of sensing a sliding by a sensor including grouping one or more Hall elements into one or more groups, measuring magnetic field strength generated by a magnetic field source, and comparing the magnetic field strength at the one or more Hall elements to determine whether a horizontal sliding occurs.

Claims

1. A method of sensing, by a sensor, a movement in a first direction, comprising:

arranging a first Hall element displaced in the first direction from a second Hall element;

arranging a magnetic field source configured to generate a magnetic field;

measuring the magnetic field at each of the first and second Hall elements; and

comparing a strength of the magnetic field measured at the first Hall element to a strength of the magnetic field measured at the second Hall element; and

determining whether the movement occurs,

wherein the arranging of the first and the second Hall elements comprises arranging the first and second Hall elements on a first body,

wherein the arranging of the magnetic field source comprises arranging the magnetic field source on a second body,

wherein the determining whether the movement occurs comprises determining whether the second body moves in the first direction relative to the first body, and

wherein the first body comprises a terminal comprising a sensor chip.

2. The method of claim 1, wherein the comparing the strength of the magnetic field comprises measuring a similarity of the magnetic field strength measured at the first Hall element and the magnetic field strength measured at the second Hall element.

3. The method of claim 2, wherein the measuring the similarity comprises determining a ratio of the magnetic field strength measured at the first Hall element to the magnetic field strength measured at the second Hall element.

4. The method of claim 3, wherein the comparing the magnetic field strength further comprises measuring a standard deviation of the magnetic field strength.

5. The method of claim 4, wherein the determining whether the movement occurs comprises determining that the second body does not change position in response to the measuring the similarity satisfying a threshold and the standard deviation satisfying a threshold.

6. The method of claim 4, wherein the determining whether the movement occurs further comprises determining that the second body changes position in response to one of the the similarity not satisfying a threshold and the standard deviation not satisfying a threshold.

7. The method of claim 3, wherein a threshold of the similarity ranges from about 0.5 to about 1.5.

8. The method of claim 4, wherein a threshold of the standard deviation ranges from about 0 to about 0.5.

9. The method of claim 1, wherein the second body comprises a flip cover comprising a magnet.

10. The method of claim 1, further comprising:

arranging a third Hall element displaced from a fourth Hall element in the first direction;

measuring a magnetic field strength at each of the third Hall element and the fourth Hall element.