Electrodynamic transducer having a dome and a buoyant hanging part
Electro-dynamic transducer including a main magnetic circuit defining an air gap, a moving part comprising a dome shaped diaphragm and a movable coil fixed thereto and diving into the air gap; a support to which the moving part is suspended; and a suspension linking the moving part and the support; wherein the suspension is floating with respect of the support, allowing a radial degree of freedom.
1. Electro-dynamic transducer including:
a main magnetic circuit defining an air gap, a moving part comprising a dome shaped diaphragm and a movable coil fixed thereto and diving into the air gap;
a support from which the moving part is suspended;
a suspension linking the moving part and the support;
wherein the suspension is floating with respect to the support, allowing a radial degree of freedom; and
wherein an end face of one end of the suspension extends in a peripheral groove of the support and is unattached.
2. Transducer according to claim 1 , wherein the suspension is in the form of a ring an inner edge of which is cast into the grove.
3. Transducer according to claim 2 , wherein a clearance of more than 0.1 mm is provided between the suspension and a bottom of the groove.
4. Transducer according to claim 2 , wherein the support comprises a plate in which the groove is formed, and a rod fixed to the plate and through which the support is fixed to the magnetic circuit.
5. Transducer according to claim 2 , wherein the groove is limited by two facing flanges and the suspension is slightly constrained between the flanges.
6. Transducer according to claim 2 , wherein the ratio between a free length and a thickness of the suspension is smaller than 5 .
7. Transducer according to claim 1 , wherein the suspension is made of a polymer reticulated foam.
8. The transducer of claim 7 , wherein the polymer is a melamine foam.
9. Transducer according to claim 1 , wherein at least one wall of the air gap is coated with a low friction material.
10. The transducer of claim 9 , wherein the low friction material is PTFE.
11. Transducer according to claim 1 , wherein the air gap and the moving coil are such dimensioned that the occupation rate of the moving coil within the air gap is equal or greater than 50%.
12. Transducer according to claim 1 , wherein the magnetic circuit comprises a pole piece around which the moving coil is positioned, and a clearance of less than a tenth of a millimeter is provided between them.
13. Transducer according to claim 1 , wherein a lubricant is provided between the suspension and the support.
14. Coaxial two-way or more loudspeaker system comprising a low range electro-dynamic transducer for the reproduction of low range and/or mid range frequencies, and an electro-dynamic transducer according to claim 1 , for the reproduction of high range frequencies.
15. System according to claim 14 , wherein the high range transducer is mounted in a coaxial and frontal position with respect to the low range transducer.
16. Loudspeaker enclosure including a coaxial loudspeaker system according to claim 14 .
17. Loudspeaker enclosure including a transducer according to claim 1 .
18. An electro-dynamic transducer comprising:
a main magnetic circuit defining an air gap,
a moving part, comprising a dome shaped diaphragm and a movable coil fixed to the
diaphragm, the moving part configured to move within the air gap;
a support from which the moving part is suspended;
a suspension attaching the moving part to the support;
wherein the suspension is configured such that the suspension has a radial degree of freedom with respect to the support so that the suspension can move radially relative to the support; and
wherein an end face of one end of the suspension extends in a peripheral groove of the support and is unattached.
19. The electro-dynamic transducer of claim 18 , wherein a gap is defined between a bottom of the peripheral groove and the one end of the suspension to allow the suspension to move within the peripheral groove in a radial direction.