Method and an assembly for generating a magnetic field and a method of manufacturing an assembly

• US 10,095,968 B2
• Filed: 12/18/2015
• Issued: 10/09/2018
• Est. Priority Date: 12/19/2014
• Status: Active Grant

• Current Assignee: CardLab ApS
• Original Assignee: CardLab ApS
• Inventors: Nielsen, Finn
• Primary Examiner(s): LEE, SEUNG H
• Application Number:
  US15/536,189
• Publication Number:
  US 20170364784A1
• Time in Patent Office: 1,026 Days
• Field of Search: 235492
• CPC Class Codes: G06K 19/06206 the magnetic marking being emulated
• CPC Class Codes: G06K 7/08 by means detecting the change of an electrostatic or magnetic field, e.g. by detecting change of capacitance between electrodes
• CPC Class Codes: G06Q 20/341 Active cards, i.e. cards including their own processing means, e.g. including an IC or chip
• CPC Class Codes: G06Q 20/342 Cards defining paid or billed services or quantities
• CPC Class Codes: G06Q 20/363 with the personal data of a user
• CPC Class Codes: G06Q 20/367 involving electronic purses or money safes
• CPC Class Codes: G06Q 20/40975 using encryption therefor
• CPC Class Codes: G07F 7/025 by means, e.g. cards, providing billing information at the time of purchase, e.g. identification of seller or purchaser, quantity of goods delivered or to be delivered
• CPC Class Codes: G07F 7/0866 by active credit-cards adapted therefor G07F7/1008 takes precedence
• CPC Class Codes: G07F 7/1008 Active credit-cards provided with means to personalise their use, e.g. with PIN-introduction/comparison system

Abstract

A credit card shaped element with a dynamic stripe which may be activated or deactivated, where the stripe is formed by a plurality of coils provided along the curve thereof, where the plurality of coils are activated in a sequential manner, where a plurality of proximity sensing coils are provided in series along the curve thereof, where the plurality of coils are formed by one coil contacted at multiple positions along its length by contact pads and where the signals fed to the coils cause an output of a reader coil to output a signals with a minimum slope or where one signal fed to one track has no peaks when the other signal is close to zero.

Claims

1. An assembly comprising:

an outer surface bounded by at least a first edge portion and a second edge portion,

a plurality of coils arranged at least substantially along a first curve at the outer surface, the first curve having a first length and extending between a first point and a second point on the outer surface, the first point being positioned within a first distance of 20% of the first length or less from the first edge portion and the second point being positioned within a second distance of 20% of the first length or less from the second edge portion,

a controller connected to the plurality of coils,

wherein the plurality of coils have symmetry axes at least substantially parallel to a plane of the outer surface,

wherein the controller is configured to sequentially feed a time-varying signal to one or more coils of the plurality of coils so that different coils of the plurality of coils receive different parts of the time-varying signal.

2. An assembly according to claim 1, wherein the controller is configured to short circuit one or more coils of the plurality of coils and output a signal to one or more other coils of the plurality of coils.

3. An assembly according to claim 1, wherein each coil of the plurality of coils has two end conductors and wherein the controller is configured to output the same signal to the end conductors of a coil.

4. An assembly according to claim 1, wherein the controller is configured to output a signal to a plurality of neighboring coils.

5. An assembly according to claim 1, further comprising at least one sensor configured to detect a presence of a metallic and/or magnetic element, the controller being connected to the sensor.

6. An assembly according to claim 5, further comprising a plurality of second coils arranged at least substantially along a second curve at the outer surface, the second curve having a second length and extending between a third point and a fourth point on the outer surface, the third point being positioned within a first distance of 25% of the second length or less from the first edge portion and the fourth point being positioned within a second distance of 25% of the second length or less from the second edge portion, the second coils connected to the controller and wherein the at least one sensor is positioned between the first curve and the second curve.

7. An assembly according to claim 5, comprising a plurality of sensors positioned in one or more groups of sensors positioned at individual positions at the outer surface, wherein one sensor from each group is connected in series and to the controller.

8. A method of operating the assembly according to claim 1, the method comprising sequentially feeding a time-varying signal to one or more coils of the plurality of coils so that different coils of the plurality of coils receive different parts of the time-varying signal.

9. A method according to claim 8, further comprising short circuiting one or more of the coils not fed by the time-varying signal.

10. A method according to claim 8, wherein

each coil has two conductor ends, and

the method includes feeding a common signal to the two conductor ends of a coil.

11. A method according to claim 8, wherein the feeding includes simultaneously feeding the time-varying signal to a plurality of neighboring coils.

12. A method according to claim 11, wherein the feeding includes

stopping feeding of the time-varying signal to one or more but not all coils fed by the time-varying signal,

continuing feeding one or more coils with the time-varying signal, and

initiating feeding the time-varying signal to one or more coils neighboring to each other and/or the one or more fed coils.

13. A method according to claim 8, further comprising determining a position, direction and/or velocity of a metallic, magnetic and/or reader element and controlling the feeding of the time-varying signal to feed the time-varying signal to coils at or in a vicinity of the metallic, magnetic and/or reader element.

14. A method according to claim 13, wherein

the determining includes determining a position of a reader element, and

the feeding includes feeding the time-varying signal to at least one coil having a particular positional relationship with the determined position.

15. A method according to claim 14, wherein the feeding includes selecting the plurality of coils to include the at least one coil.

16. A method according to claim 15, wherein the feeding includes selecting a set of coils of the plurality of coils, a centre of which is at the determined position.

17. A method according to claim 15, wherein the feeding includes selecting a set of coils of the plurality of coils of which an extreme coil is at the determined position.

18. A method according to claim 8, wherein the feeding includes:

initially determining a signal to feed to the plurality of coils and determining a first position of the reader element and feeding a first part of the signal to at least one coil having a first positional relationship with the first position with a signal and

subsequently determining a second position of the reader element and feeding the signal with an inverse phase to at least one coil having a second positional relationship with the second position.

19. A method according to claim 8, further comprising:

converting a magnetic field sense by a reader head into an electric signal.

20. A method according to claim 8, further comprising:

selecting a plurality of neighboring coils and a pattern according to which coils of a first group of the plurality of neighboring coils are fed the time-varying signal and any remaining coils of the plurality of neighboring coils are not fed the time-varying signal,

wherein the sequentially feeding includes repeatedly;

feeding the time-varying signal to the coils of the first group of the plurality of neighboring coils in accordance with the pattern, and

subsequently selecting next neighboring coils, a quantity of next neighboring coils being a particular quantity, the next neighboring coils being offset from the plurality of neighboring coils.