Near field communication ring
A near field communication ring that can be read by nearby NFC-enabled devices. The ring comprises an annular shell and a near field communication transponder mounted on the annular shell. The near field communication transponder has a coil antenna that has a plurality of turns that each extend around the entire circumference of the annular shell. The rings has various potential applications including, for example, contactless payment, ticketing on mass transit systems, operation of NFC door locks or other access systems, identity authentication, venue or event entry/ticketing and the sharing of information with NFC-enabled smartphones.
1. A ring for wearing on a finger of a user, the ring comprising:
an annular shell including an inner surface, the inner surface of the annular shell being recessed around an inner circumference of the annular shell to form an annular channel;
a near field communication transponder including a coil antenna etched onto a flexible substrate, wherein the flexible substrate has a cylindrical form configured to fit within the annular channel; and
a resin seal that encapsulates the near field communication transponder and the flexible substrate within the annular channel.
2. The ring of claim 1 , wherein the coil antenna includes at least 5 turns.
3. The ring of claim 1 , wherein the coil antenna includes at least 8 turns.
4. The ring of claim 1 , wherein the coil antenna has a plurality of turns that extend around the inner circumference of the annular shell, and wherein the plurality of turns are spaced from one another across a width of the ring.
5. The ring of claim 1 , wherein the annular channel is in a center portion of the annular shell and edge portions of the annular shell extend radially inwards or outwards from one or more sides of the annular channel.
6. The ring of claim 1 , wherein the annular shell is formed from a ceramic.
7. The ring of claim 1 , wherein the coil antenna is etched onto a conductive track carried on the flexible substrate.
8. The ring of claim 1 , wherein the near field communication transponder comprises a near field communication (NFC) chip.
9. The ring of claim 1 , wherein the resin seal is constructed using a resin and a hardener.
10. The ring of claim 1 , wherein the flexible substrate is pre-formed as a cylinder, and wherein the near field communication transponder is applied onto the cylinder.
11. The ring of claim 1 , wherein the near field communication transponder is applied to the flexible substrate in a flat state, wherein the flexible substrate is rolled to form the cylindrical form configured to fit within the annular channel.
12. The ring of claim 1 , wherein the coil antenna is etched onto the flexible substrate along a series of parallel track sections circumferentially around the flexible substrate, and wherein the parallel track sections are joined by a track step section that extends in a width direction across the flexible substrate.
13. The ring of claim 1 , wherein the annular shell is carbon fiber.
14. A method of manufacturing a wearable ring, the method comprising:
providing an annular shell including an inner surface, the inner surface of the annular shell being recessed around an inner circumference of the annular shell to form an annular channel;
mounting a flexible substrate within the annular channel, wherein the flexible substrate has a cylindrical form configured to fit within the annular channel, and wherein the flexible substrate includes a near field communication transponder that includes a coil antenna etched onto the flexible substrate; and
applying a resin seal over the near field communication transponder and the flexible substrate to encapsulate the near field communication transponder and the flexible substrate within the annular channel.
15. The method of claim 14 , wherein the annular shell is ceramic.
16. The method of claim 14 , wherein applying the resin seal comprises applying the resin seal in liquid form over the near field communication transponder and the flexible substrate after the near field communication transponder and the flexible substrate are mounted within the annular channel and curing the resin seal to solidify the resin seal.
17. The method of claim 14 , wherein:
the flexible substrate is pre-formed as a cylinder; and
the method further comprises applying the near field communication transponder onto the cylinder.
18. The method of claim 14 , further comprising:
applying the near field communication transponder to the flexible substrate in a flat state; and
rolling the flexible substrate to form the cylindrical form configured to fit within the annular channel.
19. The method of claim 14 , wherein the coil antenna is etched onto the flexible substrate along a series of parallel track sections circumferentially around the flexible substrate, wherein the parallel track sections are joined by a track step section that extends in a width direction across the flexible substrate.
20. The method of claim 14 , wherein the coil antenna includes at least 5 turns.
21. The method of claim 14 , wherein the coil antenna includes at least 8 turns.