Magnetic connection and alignment of connectible devices

• US 9,627,130 B2
• Filed: 03/24/2015
• Issued: 04/18/2017
• Est. Priority Date: 03/24/2014
• Status: Active Grant

• Current Assignee: Apple Inc.
• Original Assignee: Apple Inc.
• Inventors: Golko, Albert J., Jol, Eric S., Graham, Christopher S., Thompson, Paul J., Alves, Jeffrey M., Wagman, Daniel, Yao, Stephen E., Brzezinski, Makiko K.
• Primary Examiner(s): Rojas, Bernard
• Application Number:
  US14/666,556
• Publication Number:
  US 20150270046A1
• Time in Patent Office: 756 Days
• CPC Class Codes: H01F 38/14 Inductive couplings for wireless supply or distribution of electric power using inductive coupling H02J50/10
• CPC Class Codes: H01F 7/0247 Orientating, locating, transporting arrangements
• CPC Class Codes: H02J 50/12 of the resonant type
• CPC Class Codes: H02J 50/60 responsive to the presence of foreign objects, e.g. detection of living beings
• CPC Class Codes: H02J 7/0044 specially adapted for holding portable devices containing batteries H02J7/0045 takes precedence
• CPC Class Codes: H04B 1/3877 Arrangements for enabling portable transceivers to be used in a fixed position, e.g. cradles or boosters

Abstract

A first and second electronic device each including a connection surface and a magnetic element. The first and second devices may be in contact along the respective connection surfaces. The magnetic elements may be configured to align the first and second devices by moving either or both of the first and second devices relative to each other to achieve an aligned position. The magnetic element may also be operative to resist disconnection of first and second electronic devices when in the aligned position.

Claims

1. An electronic device, comprising:

a housing defining a connection surface;

a receiving component positioned proximate to the connection surface and within the housing, the receiving component comprising a coil of wire and a coil shield, wherein the coil shield is positioned along a surface of the coil of wire opposing the connection surface and along sides of the coil of wire transverse to the connection surface; and

a magnetic element positioned proximate to the connection surface and within the housing, the magnetic element comprising a magnet and a magnet shield positioned along a surface of the magnet opposing the connection surface, the magnet shield having sides covering sides of the magnet transverse to the connection surface and separated from the sides of the magnet by gaps, wherein the magnet shield is configured to direct a magnetic field of the magnet toward the connection surface.

2. The electronic device of claim 1, wherein the receiving component is operable to receive transmitted power when the housing and external surface are in the aligned position.

3. The electronic device of claim 2, wherein the receiving component comprises an inductive power receiving component.

4. The electronic device of claim 1, wherein:

the magnetic element generates a magnetic field; and

the magnetic field exerts a lateral magnetic force to move one of the housing and external surface relative to the other.

5. The electronic device of claim 4, wherein:

the magnetic field exerts a transverse magnetic force to resist disconnection of the housing from the external surface; and

the transverse magnetic force is greater in the aligned position than in a contact position.

6. A system for magnetic connection and alignment, comprising:

a first electronic device, comprising;

a first housing;

a receiving component positioned proximate to the connection surface and within the housing, the receiving component comprising a coil of wire and a coil shield, wherein the coil shield is positioned along a surface of the coil of wire opposing the connection surface and along sides of the coil of wire transverse to the connection surface; and

a first magnetic element, positioned within the first housing, the first magnetic element comprising a magnet and a magnet shield, the magnet having a face surface, an opposite surface, and multiple side surfaces, the magnet shield covering at least a part of the opposite surface and the multiple side surfaces, wherein the magnet shield is separated from the multiple side surfaces by a gap and is configured to direct a magnetic field of the magnet toward the face surface; and

a second electronic device, comprising;

a second housing; and

a second magnetic element positioned within the second housing;

wherein;

the first and second magnetic elements generate a magnetic force operative to move the first and second electronic devices with respect to one another from an initial position to an aligned position; and

the first housing and second housing contact each other in both the initial position and the aligned position.

7. The system of claim 6, wherein at least one of a first connection surface of the first housing or a second connection surface of the second housing comprises a low friction material.

8. The system of claim 7, wherein the low friction material comprises one or more of a crystalline material, a friction reducing coating, and a polished surface.

9. The system of claim 6, wherein a first connection surface of the first device and a second connection surface of the second device are correspondingly shaped to reduce frictional force between the first and second connection surfaces.

10. The system of claim 6, wherein a transverse magnetic force between the first magnetic element and the second magnetic element increases as the first and second electronic devices move between the initial position and the aligned position.

11. The system of claim 10, wherein:

the first magnetic element is moveably mounted within the first housing and biased away from a first connection surface of the first housing when the first and second electronic devices are not in the aligned position; and

the transverse magnetic force draws the first magnetic element toward the first connection surface when the first and second electronic devices move from the initial position to the aligned position.

12. The system of claim 6, wherein the face surface faces a first connection surface of the first housing.

13. The system of claim 12, wherein the shield element directs a magnetic field of the first magnetic element towards the first connection surface.

14. The system of claim 12, wherein the shield element comprises at least one of a soft magnetic material, a ferromagnetic material, and iron cobalt.

15. The system of claim 12, wherein the shield element is offset by a gap from at least one of the multiple side surfaces.

16. The system of claim 6, wherein the second magnetic element comprises:

a face surface facing a second connection surface of the second device and is joined to an opposite surface by multiple side surfaces; and

a shield element that at least partially covers the opposite surface and the multiple side surfaces.

17. The system of claim 16, wherein the magnetic force is a lateral magnetic force that is aligned with an interface between the first and second connection surfaces.

18. A method for magnetic connection and alignment of connectible electronic devices, the method comprising:

magnetically moving a first electronic device, with respect to a second electronic device, from a contact position to an aligned position;

directing a magnetic flux from a magnet of a first magnetic element of the first electronic device toward the second electronic device using a magnet shield that is coupled to a first surface of the magnet and is positioned apart from additional surfaces of the magnet that are transverse to the first surface such that a first receiving component in the first electronic device is aligned with a second receiving component in the second electronic device, the first receiving component comprising a coil of wire and a coil shield; and

holding the first electronic device and the second electronic device in the aligned position utilizing a magnetic force between the first magnetic element of the first electronic device and a second magnetic element of the second electronic device.

19. The method of claim 18, wherein the magnetic force exceeds a friction between a first connection surface and a second connection surface.

20. The method of claim 18, wherein magnetically moving the first electronic device and the second electronic device from the contact position to the aligned position comprises moving the first electronic device laterally with respect to the second electronic device.

21. The method of claim 18, further comprising, when the first and second devices are in the aligned position, inductively charging the first device using the second device.

22. The method of claim 18, further comprising magnetically resisting decoupling of the first and second electronic devices.

23. The method of claim 18, wherein the first and second electronic devices are components in an inductive power transmission system and moving the second electronic device into the aligned position increases inductive charging efficiency of the inductive power transmission system.