Adaptive eartip for true wireless stereo headsets

1. An apparatus for fitting an earphone device in an ear canal, the apparatus comprising:

a compressible cushion member adapted to fit into an ear canal;

a channel arranged in said cushion member extending from a first side to a second side, said channel comprising at least two opposing side walls; and

at least one spacer member extending from at least one of said side walls towards an opposing side wall, but not being connected to said opposing side wall;

wherein said at least one spacer member is configured to provide a minimum clearance C between said opposing side walls to allow acoustic waves to traverse said channel from said first side to said second side in both a non-compressed state and a compressed state of said cushion member.

2. An apparatus according to claim 1 , wherein said cushion member and said channel are ovally shaped, said channel comprising a first pair of opposing side walls defined by a smaller curvature and a second pair of opposing side walls defined by a larger curvature.

3. An apparatus according to claim 2 , wherein said at least one spacer member comprises a bump protruding from one of said first pair of opposing side walls, said bump being homogeneous with said cushion member.

4. An apparatus according to claim 3 , wherein said at least one spacer member comprises two bumps, each bump protruding from one of said first pair of opposing side walls respectively.

5. An apparatus according to claim 2 , wherein said cushion member is made from a flexible and resilient material, such as silicone, and wherein said at least one spacer member comprises a reinforcement flange attached to at least one of said second pair of opposing side walls, said reinforcement flange being made from a less flexible material than said cushion member.

6. An apparatus according to claim 5 , wherein said at least one spacer member comprises two reinforcement flanges, each reinforcement flange attached to one of said second pair of opposing side walls respectively.

7. An apparatus according to claim 1 , wherein said spacer member is arranged to partially extend between said first side and said second side within said channel; and wherein

said cushion member further comprises a continuous groove arranged within the side walls of said channel, in a section of said channel where the spacer member does not extend, to enable flexible adaptation of the cushion member to curved ear canals.

8. An apparatus according to claim 1 , wherein said cushion member comprises an elongated, hollow body with an enclosed body cavity surrounding said channel, thereby providing additional bending flexibility and compressibility.

9. An apparatus according to claim 8 , wherein said body cavity is open towards one side of the cushion member to provide a connection groove for connecting to an earphone housing.

10. An apparatus according to claim 1 , wherein

said minimum clearance C between said opposing side walls in a compressed state ranges between 1-1.5 mm;

a smallest total width of said cushion member measured in said compressed state is 3.5 mm; and

a smallest cross-sectional area of said channel measured in said compressed state is 5 square mm.

11. An apparatus according to claim 1 , wherein the compressible cushion member is anatomically shaped.

12. An earphone device comprising:

an apparatus for fitting into an ear canal, the apparatus comprising:

a compressible cushion member adapted to fit into an ear canal;

a channel arranged in said cushion member extending from a first side to a second side, said channel comprising at least two opposing side walls; and

at least one spacer member extending from at least one of said side walls towards an opposing side wall, but not being connected to said opposing side wall, said at least one spacer member being configured to provide a minimum clearance C between said opposing side walls to allow acoustic waves to traverse said channel from said first side to said second side in both a non-compressed state and a compressed state of said cushion member;

a housing adapted to be detachably connected to the cushion member of said apparatus at said first side; and

a speaker arranged in said housing and configured to generate sound waves, in response to an audio signal, for delivery through said channel towards said ear canal.

13. An earphone device according to claim 12 , wherein said detachable connection between said housing and said cushion member is a snap-fit connection between a connection groove arranged at said first side of the cushion member and a correspondingly shaped connection rim arranged on said housing.

14. An earphone device according to claim 12 , wherein

said cushion member is adapted to, when fitted into an ear canal, substantially fill a cross-section of said ear canal; and wherein

said cushion member and said housing are arranged to, when connected, provide an acoustic sealing between a first portion of the ear canal towards an ear drum and a second portion of the ear canal towards an external environment.

15. A system according to claim 12 , wherein the compressible cushion member is anatomically shaped.

16. A system comprising:

at least one earphone device, the earphone device comprising:

an apparatus for fitting the earphone device in an ear canal, the apparatus comprising:

a compressible cushion member adapted to fit into an ear canal;

a channel arranged in said cushion member extending from a first side to a second side, said channel comprising at least two opposing side walls; and

at least one spacer member extending from at least one of said side walls towards an opposing side wall, but not being connected to said opposing side wall, said at least one spacer member being configured to provide a minimum clearance C between said opposing side walls to allow acoustic waves to traverse said channel from said first side to said second side in both a non-compressed state and a compressed state of said cushion member; and

a host device arranged in data connection with said at least one earphone device and configured to generate said audio signal for delivery to said speaker via said data connection.

17. A system according to claim 16 , wherein

said earphone device is a True Wireless Stereo (TWS) headset,

said host device is a mobile smartphone, and

said data connection is established using a Bluetooth protocol.

18. A system according to claim 16 , wherein the compressible cushion member is anatomically shaped.