Acoustic membrane for a loudspeaker and corresponding loudspeaker
AssigneeFocal Jmlab
InventorGiuliano Nicoletti
Life of this patent
Estimating the term…
Abstract
A circular acoustic membrane having an upper surface and an opposite lower surface, said membrane being intended to be coupled, at the lower surface thereof, to a mobile winding via a support. The membrane has an annular fold concentrically delimiting, in the membrane, a circular central portion and an annular peripheral portion. In addition, the central portion has a concavity turned towards the upper surface and the internal edge of the fold is carried by the lower surface and comprises an attachment surface intended for the coupling of said support of the coil.
Claims16
A circular acoustic membrane having an upper surface and an opposite lower surface, said membrane being intended to be coupled at the lower surface thereof, to a mobile winding via a support,
- the membrane having a concentric annular fold delimiting in the membrane, a circular central portion and an annular peripheral portion;
- the central portion having a concavity turned towards the upper surface;
- and
- the internal edge of the fold being carried by the lower surface and comprising an attachment surface intended for the coupling of said support of the coil
- wherein the tangent to the lower surface of the central portion at a point located on the edge of the fold and a main axis of symmetry of the membrane form a first acute angle;
- and the tangent to the lower surface of the annular portion at the same point and the main axis of symmetry form a second acute angle.
A loudspeaker comprising:
- a fixed chassis;
- a magnetic circuit solidly attached to the chassis;
- an assembly mobile relative to the chassis comprising:
- a circular acoustic membrane having an upper surface and an opposite lower surface, said membrane being intended to be coupled at the lower surface thereof, to a mobile winding via a support,
- the membrane having a concentric annular fold delimiting in the membrane, a circular central portion and an annular peripheral portion;
- the central portion having a concavity turned towards the outside of the loudspeaker;
- and
- the internal edge of the fold being carried by the lower surface and comprising an attachment surface intended for the coupling of said support of the coil
- wherein the tangent to the lower surface of the central portion at a point located on the edge of the fold and a main axis of symmetry of the membrane form a first acute angle;
- and the tangent to the lower surface of the annular portion at the same point and the main axis of symmetry form a second acute angle;
- a driver coil;
- a cylindrical support bearing said coil and firmly secured to the internal edge of the annular fold of the membrane.
Dependencies are inferred from the claim text.