An audio driver assembly comprises a driver housing and an audio driver secured within the driver housing. The audio driver comprises a magnet assembly, a flexible diaphragm overlying the magnet assembly, and a stabilizer extending through the driver housing and into the magnet assembly. A headphone and a method of forming a headphone are also described.

A speaker includes a first vibrator, a first driving unit, a second vibrator, a second driving unit and a supporting unit. The first vibrator is connected to a diaphragm, which vibrates, thereby emitting sound. The first driving unit vibrates the first vibrator, thereby vibrating the diaphragm. The second vibrator is connected to a weight member. The second driving unit is connected to the opposite side of the first driving unit to the first vibrator, and vibrates the second vibrator on the same vibration axis as the vibration axis of the first vibrator, thereby vibrating the weight member. The supporting unit supports a coupled body, configured by joining the second vibrator and the weight member, at two or more portions in the direction of the vibration axis.

A vibrating unit includes a diaphragm and a bobbin, and a voice coil is secured to the bobbin. A detecting unit includes a moving magnet and a magnetic sensor. The magnetic sensor is disposed in a space surrounded by the bobbin, whereas the moving magnet is secured to an outer surface of the bobbin. Therefore, even when the moving magnet and a damper member move backward significantly, the magnetic sensor is prevented from being hit by the moving magnet and the damper member.

An electrodynamic acoustic transducer (1) is disclosed, which comprises a frame and/or a housing (2), a membrane (3), a magnet system (6) with a plurality of center magnets (7a . . . 7d, 7, 7′) having different magnetic orientations (M.sub.1 . . . M.sub.4) and a coil arrangement (10) with a plurality of voice coils (11a . . . 11d), which are movably arranged relative to the magnet system (6) in an excursion direction (z). The ratio

[00001]$\frac{A_g.Math.h_m}{A_m.Math.w_g}=\frac{l_g.Math.h_{\mathrm{tp}}.Math.h_m}{A_m.Math.w_g}$

is below 1, wherein w.sub.g denotes the mean width of all airgaps (E) within the magnet system (6), A.sub.g denotes the sum of all airgap areas within the magnet system (6), h.sub.m denotes the mean height of the center magnets (7a . . . 7d, 7, 7′) and A.sub.m denotes the total area of the center magnets (7a . . . 7d, 7, 7′). Moreover, the invention relates to an electroacoustic system (19), which comprises an electrodynamic acoustic transducer (1) of the above kind and a control circuit (CC) connected to the coil arrangement (10).

An apparatus includes a load, a lever that is coupled to the load, and an electric motor that is coupled to the lever for driving the lever in oscillatory, rotary motion about a pivot axis. The electric motor includes an armature and a stator. The armature is coupled to the lever and includes a permanent magnet. The stator defines an air gap within which the armature is disposed. The stator is configured for creating magnetic flux across the air gap for the permanent magnet to interact with, thereby to drive motion of the load. The electric motor is configured such that substantially no detent forces (a/k/a cogging forces) are generated between the stator and the permanent magnet as the lever is driven by the motor.

Provided is a speaker, including a frame, a vibration unit fixed to the frame; and a magnetic circuit unit driving the vibration unit to vibrate and produce sound. The vibration unit includes a diaphragm and a voice coil; the diaphragm includes a first suspension, a second suspension and a vibrating portion; the magnetic circuit unit includes a magnetic gap, and the voice coil is inserted in the magnetic gap; the magnetic circuit unit includes a yoke; and the vibration unit further includes a fixing ring connected to the magnetic circuit unit; an inner peripheral side of the second suspension is fixed to an outer side of the fixing ring; and a connection position of the second suspension and the fixing ring is located between two opposite ends of the fixing ring along a vibrating direction of the diaphragm. With this structure, sealing performance of the speaker is improved.

A speaker device includes a frame, a vibration unit fixedly connected to the frame, a magnetic circuit unit having a magnetic gap, and a screen cloth. The vibration unit includes a diaphragm and a voice coil. The magnetic circuit unit includes a carrier, a first main magnet, an auxiliary magnet and a magnetic conductive plate. The magnetic conductive plate is fixed to the frame. The magnetic conductive plate includes a first central portion and a first edge portion; the auxiliary magnet is located at the first central portion. The first edge portion is provided with a through hole. The screen cloth is provided at a side of the carrier away from the diaphragm, and includes a second central portion and a second edge portion. The second edge portion is provided with a first groove recessed toward the magnetic conductive plate, corresponding to the through hole.

Provided is a diaphragm for a high water pressure waterproof microspeaker. The diaphragm for a waterproof microspeaker includes an annular dome portion formed of an elastic membrane material and having a dome portion protruding upward or downward, an annular outer periphery portion attached to an outer periphery of the dome portion and injection-molded with a material having rigidity, an annular inner periphery portion attached to an inner periphery of the dome portion and injection-molded with a material having rigidity, and a center diaphragm attached to a center of the inner periphery portion, wherein the outer periphery portion and the inner periphery portion are attached to an edge portion by double-shot injection molding.

A sounding device includes a frame, and a vibration system and a magnetic circuit unit that are retained in the frame. The vibration system includes diaphragm and voice coil. The voice coil includes two first side edges and two second side edges. The magnetic circuit unit includes yoke, main magnetic body, and auxiliary magnetic body. The auxiliary magnetic body includes first auxiliary magnetic bodies each including main body portion and extension portion. The main body portion is recessed towards side surfaces of two first side edges to form grooves, the main magnetic body protrudes towards the grooves, and the pair of first side edges protrude towards the grooves, respectively. The sounding device can not only enable the auxiliary magnetic body to be more evenly surrounding the voice coil, but also enable the voice coil to have longer circumference with a same magnetic circuit area, thereby increasing BL value.

A speaker device includes a frame, a vibration unit and a magnetic circuit unit. The vibration unit includes a diaphragm fixed to the frame and a voice coil. The magnetic circuit unit includes a yoke and a magnet assembly that is accommodated and fixed in the yoke and is spaced apart from the yoke to form a magnetic gap. The voice coil is inserted in the magnetic gap. The yoke includes a yoke bottom wall, a yoke side wall and flanges. The flange includes a first section and a second section extending from the first section. A side of the first section close to the second section and the second section enclose a fixing step. The second section is fixed to the frame. The speaker device of the present disclosure has better reliability.