ELECTRODYNAMIC ACOUSTIC TRANSDUCER WITH IMPROVED SUSPENSION SYSTEM

• US 20200137500A1
• Filed: 10/29/2019
• Published: 04/30/2020
• Est. Priority Date: 10/30/2018
• Status: Active Grant

• Current Assignee: Sound Solutions International Company, Ltd. (Hon Hai Precision Industry Co., Ltd.)
• Original Assignee: Sound Solutions International Company, Ltd. (Hon Hai Precision Industry Co., Ltd.)
• Inventors: MOENKE, ADRIAN, KLAUBAUF, CHRISTIAN, KELLER, BEN-DANIEL
• Granted Patent: US 11,381,921 B2
• Time in Patent Office: Days
• CPC Class Codes: H04R 2207/00 Details of diaphragms or cones for electromechanical transducers or their suspension covered by H04R7/00 but not provided for in H04R7/00 or in H04R2307/00
• CPC Class Codes: H04R 2307/204 Material aspects of the outer suspension of loudspeaker diaphragms
• CPC Class Codes: H04R 2307/207 Shape aspects of the outer suspension of loudspeaker diaphragms
• CPC Class Codes: H04R 7/04 Plane diaphragms
• CPC Class Codes: H04R 7/18 at the periphery
• CPC Class Codes: H04R 9/025 Magnetic circuit
• CPC Class Codes: H04R 9/043 Inner suspension or damper, e.g. spider outer suspension or surround H04R7/16
• CPC Class Codes: H04R 9/045 Mounting H04R9/043 takes precedence
• CPC Class Codes: H04R 9/046 Construction
• CPC Class Codes: H04R 9/06 Loudspeakers

Abstract

An electrodynamic acoustic transducer is disclosed, which comprises at least one coil with a coil wire being wound around a loop axis and a magnet system being designed to generate a magnetic field transverse to a longitudinal extension of the coil wire and transverse to the loop axis. Furthermore, the electrodynamic acoustic transducer comprises a membrane, which is fixed to the at least one coil and to the magnet system or to a frame/housing of the electrodynamic acoustic transducer. In addition, the electrodynamic acoustic transducer comprises a suspension system, which is fixed to the at least one coil and to the magnet system or to said frame/housing. In detail, the suspension system is fixed to the at least one coil in a region of a side wall of the at least one coil, which is oriented parallel to the loop axis.

Claims

1. Electrodynamic acoustic transducer, comprising:

at least one coil, which has a coil wire being wound around a loop axis;

a magnet system being designed to generate a magnetic field transverse to a longitudinal extension of the coil wire and transverse to the loop axis;

a membrane, which is fixed to the at least one coil and to the magnet system or which is fixed to the at least one coil and to a frame/housing of the electrodynamic acoustic transducer; and

a suspension system, which is fixed to the at least one coil and to the magnet system or which is fixed to the at least one coil and to said frame/housing,

characterized in that the suspension system is fixed to the at least one coil in a region of a side wall of the at least one coil, which is oriented parallel to the loop axis.

2. Electrodynamic acoustic transducer as claimed in claim 1, characterized in that the suspension system is fixed to the side wall of the at least one coil.

3. Electrodynamic acoustic transducer as claimed in claim 2, characterized in that the suspension system is fixed to the side wall and a top wall of the at least one coil, which top wall is oriented transverse to the loop axis and faces the membrane.

4. Electrodynamic acoustic transducer as claimed in claim 1, characterized in that the suspension system is fixed to a shoulder of the coil.

5. Electrodynamic acoustic transducer as claimed in claim 1, characterized in a plurality of coils.

6. Electrodynamic acoustic transducer as claimed in claim 5, characterized in that the suspension system is arranged between two coils.

7. Electrodynamic acoustic transducer as claimed in claim 3, characterized in that the suspension system forms a pot, wherein the loop axis intersects said pot.

8. Electrodynamic acoustic transducer as claimed in claim 1, characterized in that the suspension system forms a closed ring around the loop axis.

9. Electrodynamic acoustic transducer as claimed in claim 1, characterized in that the suspension system forms arms or legs or levers connecting the at least one coil to the magnet system or to the frame/housing.

10. Electrodynamic acoustic transducer as claimed in claim 9, characterized in that the at least one coil is polygonal in shape and the suspension system is connected to the at least one coil only at its corners.

11. Electrodynamic acoustic transducer according to claim 10, characterized in that the magnet system is arranged in the region of the longitudinal sides of the at least one polygonal coil and discontinues in the region of the corners of the at least one polygonal coil.

12. Electrodynamic acoustic transducer as claimed in claim 1, characterized in that a ratio of a stiffness of the suspension system to a stiffness of the membrane in direction of the loop axis is below 1.5.

13. Electrodynamic acoustic transducer as claimed in claim 1, characterized in that a ratio of a stiffness of the suspension system to a stiffness of the membrane in direction transverse to the loop axis is below 1.5.

14. Electrodynamic acoustic transducer as claimed in claim 1, characterized in that a ratio of a thickness of the membrane to a thickness of the suspension system measured in direction of the loop axis is in a range of 0.5 to 3.0.

15. Electrodynamic acoustic transducer as claimed in claim 1, characterized in that the membrane and the suspension system are made of the same material.

16. Electrodynamic acoustic transducer as claimed in claim 1, characterized in that the membrane and/or the suspension system are made of one or more layers of Polyaryletherketone, Acrylate, Thermoplastic Elastomeric, Polyetherimide, Polycarbonate and/or silicone rubber.

17. Electrodynamic acoustic transducer as claimed in claim 1, characterized in that a profile of the suspension system in a sectional plane parallel to the loop axis corresponds to a profile of the membrane in this plane, wherein a deviation of said profile of the suspension system and said profile of the membrane is less than 0.2 mm in a direction parallel to the loop axis.

18. Electrodynamic acoustic transducer as claimed in claim 1, characterized in that a profile of the suspension system in a sectional plane parallel to the loop axis corresponds to a mirrored profile of the membrane in this plane mirrored around an axis transverse to the loop axis, wherein a deviation of said profile of the suspension system and said mirrored profile of the membrane is less than 0.2 mm in a direction parallel to the loop axis.

19. Electrodynamic acoustic transducer as claimed in claim 1, characterized in that a moving volume between the membrane and the suspension system is hermetically sealed.

20. Electrodynamic acoustic transducer as claimed in claim 1, characterized in that a moving volume between the membrane and the suspension system is permeable to air.

21. Electrodynamic acoustic transducer as claimed in claim 1, characterized in that the area of the membrane seen in a direction parallel to the loop axis is smaller than 600 mm² and/or the back volume of the transducer is in a range from 200 mm³ to 6 cm³.

22. Electrodynamic acoustic transducer as claimed in claim 1, characterized in that a diameter of the coil wire is ≤

110 μ

m.