Compact electrodynamic loudspeaker having a convex diaphragm

Patent metadata

Field	Value
Publication number	US-2017171663-A1
Application number	US-201415101398-A
Country	US
Kind code	A1
Filing date	Dec 5, 2014
Priority date	Dec 5, 2013
Publication date	Jun 15, 2017
Grant date	—

Abstract

An electrodynamic loudspeaker ( 10 ) including:
a chassis ( 15 ), at least one magnetic circuit ( 20 ) secured to the chassis, at least one movable assembly ( 30 ) with respect to the chassis, the assembly ( 30 ) including a convex diaphragm ( 53 ) turned towards the outside of the loudspeaker, and at least one energizing coil ( 57 ) defining an axis (D) of the loudspeaker, a first suspension joint ( 35 ) connecting the assembly and the chassis, and a second suspension joint ( 40 ) of the assembly, the second joint being axially further away from the diaphragm than the first joint.

The assembly further comprises at least one connecting member ( 59 ) secured to the diaphragm, the second joint including a radially inner attachment point ( 81 ) attached on the connecting member, and a radially outer attachment point ( 83 ) attached on the chassis.

First claim

1 . An electrodynamic loudspeaker including:
a chassis, at least one magnetic circuit secured to the chassis and defining at least one air gap, at least one movable assembly relatively to the chassis, the assembly including a convex diaphragm, the convexity of which is turned towards the outside of the loudspeaker, and at least one coil for exciting the diaphragm, the coil being located in the air gap and defining an axis of the loudspeaker, a first joint for suspending the assembly connecting the assembly and the chassis, and a second joint for suspending the assembly, the second joint being axially further away from the diaphragm than the first joint, wherein the assembly further comprises at least one connecting member secured to the diaphragm, the second joint including a radially inner attachment point attached on the connecting member, and a radially outer attachment point attached on the chassis.

2 . The loudspeaker according to claim 1 , wherein the coil occupies at rest a rest position axially located between a first radial plane in which the first joint substantially extends, and a second radial plane in which the second joint substantially extends.

3 . The loudspeaker according to claim 2 , wherein the rest position of the coil is axially located between the first radial plane and a middle plane located at an equal distance from the first plane and from the second plane.

4 . The loudspeaker according to claim 1 , wherein the assembly further comprises a coil-holder attached on a central portion of the diaphragm, the connecting member being distinct from the coil-holder and attached on a peripheral portion of the diaphragm.

5 . The loudspeaker according to claim 4 , wherein the connecting member has a general shape which axially converges in the direction from the diaphragm to the magnetic circuit.

6 . The loudspeaker according to claim 4 , wherein the first joint includes a radially inner attachment point attached on the connecting member, the connecting member having a shape so that said radially inner attachment point of the first joint is axially located away from the peripheral edge of the diaphragm.

7 . The loudspeaker according to claim 6 , wherein said shape of the connecting member is such that said radially inner attachment point of the first joint is substantially closer to the axis than the peripheral edge of the diaphragm.

8 . The loudspeaker according to claim 1 , wherein the connecting member includes an axially proximal portion with respect to the diaphragm, and an axially distal portion with respect to the diaphragm, the radially inner attachment point of the second joint being substantially located along the axis on an end of the distal portion, the end being opposite to the proximal portion along the axis.

9 . The loudspeaker according to claim 1 , wherein the connecting member is openworked.

10 . An acoustic chamber including at least one loudspeaker ( 10 ) as defined by any of claims 1 to 9 .

11 . The loudspeaker according to claim 4 , wherein the connecting member is attached on a peripheral edge of the diaphragm.

Assignees

• Devialet

Inventors

• Calmel Pierre-Emmanuel
• Petroff Antoine
• Afresne Jean-Loup

Classifications

• H04R7/20

  Securing diaphragm or cone resiliently to support by flexible material, springs, cords, or strands · CPC title

• H04R7/127

  dome-shaped · CPC title

• H04R9/025

  Magnetic circuit · CPC title

• H04R9/06 Primary

  Loudspeakers · CPC title

• H04R7/18

  at the periphery · CPC title