Key system for enabling operation of a device

• US 8,314,671 B2
• Filed: 01/16/2012
• Issued: 11/20/2012
• Est. Priority Date: 04/04/2008
• Status: Active Grant

• Current Assignee: Correlated Magnetics Research, LLC
• Original Assignee: Correlated Magnetics Research, LLC
• Inventors: Fullerton, Larry W., Roberts, Mark, Richards, James Lee
• Primary Examiner(s): BARRERA, RAMON M
• Application Number:
  US13/351,203
• Publication Number:
  US 20120112865A1
• Time in Patent Office: 309 Days
• Field of Search: 335/285, 335302-306, 243/03
• US Class Current: 335/285
• CPC Class Codes: G09F 7/04 the elements being secured or adapted to be secured by magnetic means
• CPC Class Codes: H01F 7/0263 Closures, bags, bands, engagement devices with male and female parts
• CPC Class Codes: Y10T 24/32 having magnetic fastener
• CPC Class Codes: Y10T 29/49826 Assembling or joining
• CPC Class Codes: Y10T 29/4998 Combined manufacture including applying or shaping of fluent material

Abstract

A key system for enabling operation of a device. The key system is based on magnets arranged according to one or more codes. The codes may act as a unique identifier or key, requiring a matching part to operate the device. Thus, the code can act like a key that will only achieve lock when matched with a like (complementary) pattern. The codes may be from a set of codes having low cross correlation among codes in the set, for example Kasami codes or Gold codes.

Claims

1. A system for operating a first device and a second device, comprising:

a first magnetic structure associated with a first part, said first magnetic structure having a first plurality of magnetic sources arranged in accordance with a first code;

a second magnetic structure associated with a second part, said second magnetic structure having a second plurality of magnetic sources arranged in accordance with a second code, said second part being movable relative to said first part, said first part and said second part achieving a match when said first plurality of magnetic sources and said second plurality of magnetic sources are in a first alignment, said first alignment producing a first peak force in accordance with a cross correlation property of said first code and said second code, said first peak force greater than a first predefined threshold;

said first part enabling operation of said first device when said first part and said second part are in said first alignment;

a third magnetic structure associated with a third part, said third magnetic structure having a third plurality of magnetic sources arranged in accordance with a third code; and

a fourth magnetic structure associated with a fourth part, said fourth magnetic structure having a fourth plurality of magnetic sources arranged in accordance with a fourth code, said fourth part being movable relative to said third part, said third part and said fourth part achieving a match when said third plurality of magnetic sources and said fourth plurality of magnetic sources are in a second alignment, said second alignment producing a second peak force in accordance with a cross correlation property of said third code and said fourth code, said second peak force greater than a second predefined threshold;

said third part enabling operation of said second device when said third part and said fourth part are in said second alignment;

said fourth part being movable relative to said first part within a range of motion, said first part and said fourth part producing a force function within said range of motion having a first maximum value less than said first predefined threshold, said first maximum value failing to enable operation of said first device;

wherein said first code and said third code are from a set of codes having a low mutual cross correlation among all codes in the set of codes, said low mutual cross correlation being less than half of a peak autocorrelation for a code in the set of codes; and

wherein the set of codes is a Kasami set or a Gold set.

2. The system of claim 1 wherein said first part is a lock and said second part is a key.

3. The system of claim 1, wherein said first peak force is an attractive force.

4. The system of claim 1, wherein said first peak force is a repelling force.

5. The system of claim 1, wherein said first part and said fourth part produce said force function in accordance with a cross correlation property of said first code and said fourth code.

6. The system of claim 1, wherein said first code is complementary to said second code.

7. The system of claim 1, wherein said first magnetic structure comprises a ring structure.

8. The system of claim 1, wherein said first magnetic structure comprises a linear structure.

9. A system for operating a first device and a second device, comprising:

a first magnetic structure associated with a first part, said first magnetic structure having a first plurality of magnetic sources arranged in accordance with a first code;

a second magnetic structure associated with a second part, said second magnetic structure having a second plurality of magnetic sources arranged in accordance with a second code, said second part being movable relative to said first part, said first part and said second part achieving a match when said first plurality of magnetic sources and said second plurality of magnetic sources are in a first alignment, said first alignment producing a first peak force in accordance with a cross correlation property of said first code and said second code, said first peak force greater than a first predefined threshold;

said first part enabling operation of said first device when said first part and said second part are in said first alignment;

a third magnetic structure associated with a third part, said third magnetic structure having a third plurality of magnetic sources arranged in accordance with a third code; and

a fourth magnetic structure associated with a fourth part, said fourth magnetic structure having a fourth plurality of magnetic sources arranged in accordance with a fourth code, said fourth part being movable relative to said third part, said third part and said fourth part achieving a match when said third plurality of magnetic sources and said fourth plurality of magnetic sources are in a second alignment, said second alignment producing a second peak force in accordance with a cross correlation property of said third code and said fourth code, said second peak force greater than a second predefined threshold;

said third part enabling operation of said second device when said third part and said fourth part are in said second alignment;

said fourth part being movable relative to said first part within a range of motion, said first part and said fourth part producing a force function within said range of motion having a first maximum value less than said first predefined threshold, said first maximum value failing to enable operation of said first device;

wherein said first code and said second code are in accordance with a first autocorrelation function having a single maximum peak magnitude value per code modulo and one or more peaks separate from said single maximum peak wherein a maximum magnitude value of said one or more peaks is less than half of the single maximum peak magnitude value.

10. A system for operating a first device and a second device, comprising:

a first magnetic structure associated with a first part, said first magnetic structure having a first plurality of magnetic sources arranged in accordance with a first code;

a second magnetic structure associated with a second part, said second magnetic structure having a second plurality of magnetic sources arranged in accordance with a second code, said second part being movable relative to said first part, said first part and said second part achieving a match when said first plurality of magnetic sources and said second plurality of magnetic sources are in a first alignment, said first alignment producing a first peak force in accordance with a cross correlation property of said first code and said second code, said first peak force greater than a first predefined threshold;

said first part enabling operation of said first device when said first part and said second part are in said first alignment;

a third magnetic structure associated with a third part, said third magnetic structure having a third plurality of magnetic sources arranged in accordance with a third code; and

a fourth magnetic structure associated with a fourth part, said fourth magnetic structure having a fourth plurality of magnetic sources arranged in accordance with a fourth code, said fourth part being movable relative to said third part, said third part and said fourth part achieving a match when said third plurality of magnetic sources and said fourth plurality of magnetic sources are in a second alignment, said second alignment producing a second peak force in accordance with a cross correlation property of said third code and said fourth code, said second peak force greater than a second predefined threshold;

said third part enabling operation of said second device when said third part and said fourth part are in said second alignment;

said fourth part being movable relative to said first part within a range of motion, said first part and said fourth part producing a force function within said range of motion having a first maximum value less than said first predefined threshold, said first maximum value failing to enable operation of said first device;

wherein said first code and said second code are in accordance with a first autocorrelation function having discrete values corresponding to magnet positions in said first magnetic structure, and said first code autocorrelation function has a single maximum peak magnitude value per code modulo and all other values have a magnitude of less than half of the single maximum peak magnitude value.

11. A system for operating a first device and a second device, comprising:

a first magnetic structure associated with a first part, said first magnetic structure having a first plurality of magnetic sources arranged in accordance with a first code;

a second magnetic structure associated with a second part, said second magnetic structure having a second plurality of magnetic sources arranged in accordance with a second code, said second part being movable relative to said first part, said first part and said second part achieving a match when said first plurality of magnetic sources and said second plurality of magnetic sources are in a first alignment, said first alignment producing a first peak force in accordance with a cross correlation property of said first code and said second code, said first peak force greater than a first predefined threshold;

said first part enabling operation of said first device when said first part and said second part are in said first alignment;

a third magnetic structure associated with a third part, said third magnetic structure having a third plurality of magnetic sources arranged in accordance with a third code; and

a fourth magnetic structure associated with a fourth part, said fourth magnetic structure having a fourth plurality of magnetic sources arranged in accordance with a fourth code, said fourth part being movable relative to said third part, said third part and said fourth part achieving a match when said third plurality of magnetic sources and said fourth plurality of magnetic sources are in a second alignment, said second alignment producing a second peak force in accordance with a cross correlation property of said third code and said fourth code, said second peak force greater than a second predefined threshold;

said third part enabling operation of said second device when said third part and said fourth part are in said second alignment;

said fourth part being movable relative to said first part within a range of motion, said first part and said fourth part producing a force function within said range of motion having a first maximum value less than said first predefined threshold, said first maximum value failing to enable operation of said first device;

wherein said first code and said second code are in accordance with a first autocorrelation function having a single maximum peak magnitude value per code modulo wherein a maximum magnitude value of said autocorrelation function separated from said single maximum peak by at least one magnet position is less than half of the single maximum peak magnitude value.

12. A key system for enabling operation of a device, said key system comprising:

a first magnetic structure for association with a first device, said first magnetic structure comprising magnetic field components configured in accordance with a first code;

said first code having a first maximum autocorrelation magnitude;

a first complementary magnetic structure complementary to said first magnetic structure, said first complementary magnetic structure for association with a first key, said first magnetic structure and said first complementary magnetic structure having a first enabled configuration when in mechanical alignment;

said first enabling configuration enabling the operation of said first device;

a second magnetic structure for association with a second device, said second magnetic structure comprising magnetic field components configured in accordance with a second code, said second code having a second maximum autocorrelation magnitude;

a second complementary magnetic structure complementary to said second magnetic structure, said second complementary magnetic structure for association with a second key, said second magnetic structure and said second complementary magnetic structure having a second enabling configuration when in mechanical alignment;

said first code and said second code having a cross correlation function having a peak magnitude less than half of said first maximum autocorrelation magnitude and less than half of said second maximum autocorrelation magnitude;

said first magnetic structure having no enabling configuration enabling the operation of said first device when said first magnetic structure and said second complementary structure are in mechanical alignment.

13. The system in accordance with claim 12, wherein said first code and said second code are from a set of codes having a low mutual cross correlation among all codes in the set of codes, said low mutual cross correlation being less than half of a peak autocorrelation for a code in the set of codes.

14. The system in accordance with claim 13, wherein the set of codes is a Kasami set.

15. The system in accordance with claim 13, wherein the set of codes is a Gold set.

16. The system in accordance with claim 12, wherein said first magnetic structure comprises a ring structure.

17. The system in accordance with claim 12, wherein said first magnetic structure comprises a linear structure.

18. The system in accordance with claim 12, wherein said first code autocorrelation function has a single maximum peak magnitude value per code modulo and one or more peaks separate from said single maximum peak wherein a maximum magnitude value of said one or more peaks is less than half of the single maximum peak magnitude value.

19. The system in accordance with claim 12, wherein said first code autocorrelation function has discrete values corresponding to magnet positions in said first magnet structure, and said first code autocorrelation function has a single maximum peak magnitude value per code modulo and all other values have a magnitude of less than half of the single maximum peak magnitude value.

20. The system in accordance with claim 12, wherein said first code autocorrelation function has a single maximum peak magnitude value per code modulo wherein a maximum magnitude value of said autocorrelation function separated from said single maximum peak by at least one magnet position is less than half of the single maximum peak magnitude value.

21. The system in accordance with claim 20, wherein said first code and said second code are from a set of codes having a low mutual cross correlation among all codes in the set of codes, said low mutual cross correlation being less than half of a peak autocorrelation for a code in the set of codes.

22. The system in accordance with claim 21, wherein the set of codes is a Kasami set.

23. The system in accordance with claim 21, wherein the set of codes is a Gold set.

24. The system in accordance with claim 20, wherein said first magnetic structure comprises a ring structure.

25. The system in accordance with claim 20, wherein said first magnetic structure comprises a linear structure.