An electronic device has an exterior housing with a piezoelectric speaker disposed in an opening formed within the housing. The piezoelectric speaker includes a speaker diaphragm that is secured within the opening with a vibration isolator. The vibration isolator allows the diaphragm to vibrate independently from the housing.

A loudspeaker includes a voice coil in a balanced state. In the loudspeaker, at least a first suspension element acts on a first side of the voice coil, and at least a second suspension element acts on a second side of the voice coil. The loudspeaker includes a symmetric magnet assembly. The voice coil aligns with the symmetric magnet assembly. The symmetric alignment contributes to the loudspeaker yielding substantially symmetric motor force (BL), suspension stiffness (K), and inductance (Le).

A sound-producing balanced armature receiver, as disclosed, includes a receiver housing with a first internal volume, a second internal volume, and a sound outlet. The receiver includes a first diaphragm separating the first internal volume into a first front volume and a first back volume and a second diaphragm separating the second internal volume into a second front volume and a second back volume. The receiver also includes a motor inside the first back volume of the housing such that the motor includes an armature mechanically coupled to both the first diaphragm and the second diaphragm, an acoustic seal between the first front volume and the second back volume such that the acoustic seal accommodates the mechanical coupling of the armature to the second diaphragm while providing acoustic separation between the first internal volume and the second internal volume, and a back-volume increasing structure attached externally to the housing and acoustically coupled with the second back volume to provide additional volume to the second back volume.

A sound-producing balanced armature receiver, as disclosed, includes a receiver housing with a first internal volume, a second internal volume, and a sound outlet. The receiver includes a first diaphragm separating the first internal volume into a first front volume and a first back volume and a second diaphragm separating the second internal volume into a second front volume and a second back volume. The receiver also includes a motor inside the first back volume of the housing such that the motor includes an armature mechanically coupled to both the first diaphragm and the second diaphragm, an acoustic seal between the first front volume and the second back volume such that the acoustic seal accommodates the mechanical coupling of the armature to the second diaphragm while providing acoustic separation between the first internal volume and the second internal volume, and a back-volume increasing structure attached externally to the housing and acoustically coupled with the second back volume to provide additional volume to the second back volume.

Disclosed is a micro speaker, comprising a vibration system, a magnetic circuit system and a support system; the vibration system comprises a vibrating diaphragm; a dodging groove is provided on a dome portion of the vibrating diaphragm opposite to a groove structure of an upper housing; the depth of the dodging groove is not less than that of the groove structure; an orthographic projection area of the dodging groove covers that of the groove structure; a dodging structure is provided on a washer of the magnetic circuit system opposite to the dodging groove; the depth of the dodging structure is not less than that of the dodging groove; and the orthographic projection area of the dodging structure covers that of the dodging groove. This structure ensures the normal operation of a product and acoustic performance of a micro speaker while preventing collision of components.

An example vibrating body for the acoustic transducer may include a diaphragm including a first vibrating part and a second vibrating part located at an outer circumference of the first vibrating part. A coil is configured to vibrate the diaphragm. An edge portion is located at an outer circumference of the diaphragm. A plurality of ribs are provided outside of the coil on the second vibrating part formed integrally with the second vibrating part. A plurality of ribs is provided on the edge portion formed integrally with the edge portion. None of the integrally formed ribs is provided inside of the coil on the first vibrating part. The ribs provided on the second vibrating part are formed in an inner circumferential side of regions of the edge portion, the regions being located between the ribs provided on the edge portion next to each other.

An example vibrating body for the acoustic transducer may include a diaphragm including a first vibrating part and a second vibrating part located at an outer circumference of the first vibrating part. A coil is configured to vibrate the diaphragm. An edge portion is located at an outer circumference of the diaphragm. A plurality of ribs are provided outside of the coil on the second vibrating part formed integrally with the second vibrating part. A plurality of ribs is provided on the edge portion formed integrally with the edge portion. None of the integrally formed ribs is provided inside of the coil on the first vibrating part. The ribs provided on the second vibrating part are formed in an inner circumferential side of regions of the edge portion, the regions being located between the ribs provided on the edge portion next to each other.

Embodiments of the present disclosure relate to an organic light emitting display device which directly vibrates an organic light emitting display panel to generate sound, and includes: an organic light emitting display panel including a light emitting layer including an organic light emitting material layer and an encapsulation layer disposed at one side of the light emitting layer; and a sound generating actuator in direct contact with the organic light emitting display panel to vibrate the organic light emitting display panel to generate sound. Especially, the organic light emitting display panel is a bottom emission type device, and thus can prevent generation of a weighted color mixing phenomenon in a wide viewing angle at the time of panel vibration and reduce the thickness or weight of the panel to thereby enhance the sound generation characteristic.

An inertial exciter for use with an acoustic radiator, the inertial exciter comprising: a magnet assembly including a magnet unit configured to provide a magnetic field in an air gap, wherein the air gap extends around a movement axis of the inertial exciter; a coil assembly including: an attachment portion configured to provide an attachment between the coil assembly and the acoustic radiator; a voice coil; a voice coil former which extends from the attachment portion into the air gap.

An inertial exciter for use with an acoustic radiator, the inertial exciter comprising: a magnet assembly including a magnet unit configured to provide a magnetic field in an air gap, wherein the air gap extends around a movement axis of the inertial exciter; a coil assembly including: an attachment portion configured to provide an attachment between the coil assembly and the acoustic radiator; a voice coil; a voice coil former which extends from the attachment portion into the air gap.