Audio transducers
The invention relates to audio transducers, such as loudspeaker, microphones and the like, and includes improvements in or relating to: audio transducer diaphragm structures and assemblies, audio transducer mounting systems; audio transducer diaphragm suspension systems, personal audio devices incorporating the same and any combination thereof. The embodiments of the invention include linear action and rotational action transducers. For both types of transducer, rigid and composite diaphragm constructions and unsupported diaphragm periphery designs are described. Systems and methods for mounting the transducer to a housing, such as an enclosure or baffle are also described. Furthermore, hinge systems including: rigid contact hinge systems and flexible hinge systems are also disclosed for various rotational action transducer embodiments. Various applications and implementations are described and envisaged for the audio transducer embodiments including, for example, personal audio devices such as headphones, earphones and the like.
1. An audio device comprising:
an audio transducer having a moveable diaphragm and a transducing mechanism operatively coupled to the diaphragm, the diaphragm having a diaphragm body of substantial thickness relative to a length of the diaphragm body; and
a decoupling mounting system located between a first part incorporating the audio transducer and at least one other part of the audio device to at least partially alleviate mechanical transmission of vibration between the first part and the at least one other part, the decoupling mounting system compliantly mounting a first component to a second component of the audio device.
2. An audio device as claimed in claim 1 wherein the diaphragm body comprises a maximum thickness dimension that is at least approximately 11 percent of a greatest length dimension of the diaphragm body.
3. An audio device as claimed in claim 2 wherein the diaphragm body comprises a maximum thickness dimension that is at least approximately 14 percent of the greatest length dimension.
4. An audio device as claimed in claim 2 wherein the greatest length dimension of the diaphragm body extends across three orthogonal dimensions of the diaphragm body including a length, thickness and width of the diaphragm body.
5. An audio device as claimed in claim 1 wherein the diaphragm body is substantially rigid during operation.
6. An audio device as claimed in claim 1 wherein the diaphragm comprises a relatively lower mass, per unit area of a major face of the diaphragm body, at one or more peripheral regions of the diaphragm distal from a centre of mass region, relative to a mass per unit area at or adjacent the centre of mass region.
7. An audio device as claimed in claim 1 wherein the diaphragm body comprises a relatively greater thickness at or adjacent a centre of mass region of the diaphragm relative to one or more peripheral regions distal from the centre of mass region.
8. An audio device as claimed in claim 1 wherein the diaphragm comprises a lower mass at one end of the diaphragm relative to an opposing end of the diaphragm.
9. An audio device as claimed in claim 1 wherein the diaphragm further comprises normal stress reinforcement coupled on or adjacent at least one of major face of the diaphragm body for resisting compression-tension stresses experienced at or adjacent the face of the diaphragm body during operation.
10. An audio device as claimed in claim 9 wherein the normal stress reinforcement comprises a normal stress reinforcement plate coupled on or adjacent at least one major face of the diaphragm body.
11. An audio device as claimed in claim 10 wherein each normal stress reinforcement plate comprises a lower mass and/or thickness at one or more peripheral regions of the diaphragm distal from a centre of mass region of the diaphragm relative to a thickness of the normal stress reinforcement plate at or adjacent the centre of mass region.
12. An audio device as claimed in claim 10 wherein each normal stress reinforcement plate comprises one or more recesses at one or more peripheral regions of the diaphragm distal from a centre of mass region of the diaphragm.
13. An audio device as claimed in claim 1 wherein the diaphragm comprises at least one inner reinforcement member embedded within a core material of the diaphragm body and oriented at an angle relative to at least one major face of the diaphragm body for resisting shear deformation experienced by the diaphragm body during operation.
14. An audio device as claimed in claim 1 further comprising a housing closely surrounding the diaphragm, and wherein an outer periphery of the diaphragm comprises one or more peripheral regions unsupported by the surrounding housing and free from physical connection with an interior of the surrounding housing.
15. An audio device as claimed in claim 1 wherein the audio transducer further comprises a diaphragm base frame rigidly coupled to an outer periphery of the diaphragm and wherein the transducing mechanism comprises one or more force transferring components coupled to the diaphragm base frame.
16. An audio device as claimed in claim 1 wherein the diaphragm is rotatable during operation of the transducing mechanism about an axis of rotation.
17. An audio device as claimed in claim 1 wherein:
the audio transducer further comprises a transducer base structure and the diaphragm is moveably coupled to the transducer base structure, and wherein the decoupling mounting system compliantly mounts the base structure to another part of the audio device, wherein the other part of the audio device is not the diaphragm of the audio transducer.
18. An audio device as claimed in claim 17 wherein the decoupling mounting system comprises at least one node axis mount that is configured to locate at or proximal to a node axis location associated with the transducer base structure.
19. An audio device as claimed in claim 17 wherein the decoupling mounting system comprises at least one distal mount configured to locate distal from a node axis location associated with the transducer base structure.
20. An audio device as claimed in claim 1 wherein:
the audio transducer further comprises a transducer base structure and the diaphragm is moveably coupled to the transducer base structure,
the audio device further comprises a baffle or enclosure surrounding the audio transducer base structure; and
the decoupling mounting system couples and locates between the transducer base structure and an interior of the baffle or enclosure.
21. An audio device as claimed in claim 20 wherein the decoupling mounting system compliantly mounts the transducer base structure to the interior of the baffle or enclosure.
22. An audio device as claimed in claim 1 wherein the audio device further comprises a second audio transducer and the decoupling mounting system compliantly mounts the base structure to a part of the second audio transducer, wherein the part of the second audio transducer is not a diaphragm of the second audio transducer.
23. An audio device as claimed in claim 1 wherein the diaphragm comprises a maximum thickness dimension that is at least approximately 15% of a radius dimension extending from a centre of mass of the diaphragm to a most distal periphery of the diaphragm in a direction substantially perpendicular to the maximum thickness dimension.
24. An audio device as claimed in claim 1 wherein the decoupling mounting system compliantly mounts the audio transducer to another part of the audio device to substantially alleviates mechanical transmission of vibration between the audio transducer and the other part, and to substantially decouple the audio transducer from the other part.