In-ear earpiece and expansion adaptor
There is provided an in-ear earphone having a housing ( 50 ) for receiving an electroacoustic transducer and an expansion adaptor unit ( 20 ) which is coupled to the housing ( 50 ) of the in-ear earphone. The expansion adaptor unit ( 20 ) has an expansion unit ( 20 ) with an upper portion ( 26 ) having a curvature for fitting into a crus inferius anthelicis, an anti-helix and/or a concha of an ear of a user. The expansion adaptor unit further has at least one coupling element for coupling the upper portion ( 26 ) to the housing ( 50 ) of the in-ear earphone, wherein the expansion unit ( 20 ) has at least two flexible legs ( 22, 25 ) as coupling elements, wherein one leg ( 22 ) is coupled to a first end ( 28 ) of the upper portion ( 26 ) and a second leg ( 25 ) is coupled to a second end ( 29 ) of the upper portion ( 26 ).
1. An in-ear earphone comprising:
a housing for receiving an electroacoustic transducer, and
an expansion adaptor unit coupled to the housing of the in-ear earphone,
wherein the expansion adaptor unit has an expansion unit having a substantially shark fin shape that includes an upper portion with a curvature for fitting in a crus inferius anthelicis, in an anti-helix and in a concha of an ear of a user and at least one flexible coupling element for coupling the upper portion to the housing of the in-ear earphone,
wherein the upper portion has a first end and a second end and the at least one flexible coupling element is coupled to the second end, the upper portion having a substantially convex shape beginning at the second end and extending toward the housing and the at least one flexible coupling element having a substantially concave shape beginning at the second end and extending toward the housing,
wherein the expansion adaptor unit is made of a flexible material,
wherein the curvature of the upper portion is selected to fit securely in the crus inferius anthelicis and the anti-helix of the ear of the user and wherein the second end of the upper portion bears against the crus inferius anthelicis, and
wherein the expansion unit has a spring stiffness in a vertical direction of between 0.05 and 0.6 N/mm and a spring stiffness in a horizontal direction of between 0.02 and 0.4 N/mm, the spring stiffness permitting a secure fit of the expansion unit in the ear of the user by bearing against the crus inferius anthelicis at the second end of the upper portion.
2. The in-ear earphone of claim 1 wherein the concave shape of the at least one flexible coupling element has a curvature radius which is smaller than a curvature radius of the upper portion.