A damper and a speaker apparatus includes the damper, which suppresses damage to an oscillatory system from an excessive input signal, enabling an efficiency increase of the speaker apparatus. As a damper has a planar surface, undue deformation of the oscillatory system due to an excessive input signal is suppressed, and damage to the oscillatory system can be suppressed. Furthermore, since the deformation of a corrugation portion by a normal input signal is hardly prevented, a reduction in sound pressure of the speaker apparatus with respect to an input signal is suppressed, enabling an increase in efficiency. Furthermore, the planar surface is extended at a height in a thickness direction different from that of an attachment portion. Thus, rising portions are deformed when a voice coil bobbin is oscillated, enabling suppression of rupture of the damper in the vicinity of a boundary between the planar surface and the attachment portion.

One embodiment provides a slim acoustic transducer with a diaphragm including a hole that is substantially centered on a vertical axis of the diaphragm. The hole has a first horizontal width. A voice coil has a ring shape that is disposed at least partially within the hole and substantially centered on the vertical axis. The ring shape has an outer and inner horizontal width. The outer horizontal width is smaller than or equal to the first horizontal width of the hole. A column structure is disposed at least partially within the ring shape and substantially centered on the vertical axis. The column structure has a second horizontal width that is smaller than or equal to the inner horizontal width of the ring shape. The column structure includes an upper magnet, a middle plate disposed below the upper magnet and a lower magnet disposed below the middle plate.

In one embodiment, there is described a new transducer, and in particular an improved system and method for producing linear motion for a transducer such as used in voice coils converting from an electrical input to a mechanical linear motion input.

A speaker with a hidden folding ring includes a basin frame, a magnetic circuit system mounted on the basin frame, a voice coil disposed in a magnetic gap of the magnetic circuit system and a diaphragm. The diaphragm is of a concave structure, and an outer edge end of the diaphragm is connected to an inner bracket of the basin frame through a folding ring. The folding ring is located below the diaphragm, so that a cavity formed between the folding ring and the basin frame. An inner peripheral end of the diaphragm engaged to the voice coil. The present invention effectively increases the radiation area of the diaphragm, and obtains a higher SPL than the existing speaker of the same size, thereby improving the acoustic performance of the speaker.

An assembly method of a loudspeaker with closed membrane provides for preassembling a mobile unit having two centering devices fixed to a voice coil; pre-assembling a fixed unit that has a basket fixed to a magnetic unit, assembling the mobile unit in the fixed unit, by a centering device; extracting the centering device and fixing a closed membrane to the voice coil and to the basket.

An electroacoustic transducer includes: a diaphragm; a magnetic circuit having a magnetic gap; a frame that holds the diaphragm and the magnetic circuit; a voice coil having one end portion positioned within the magnetic gap and the other end portion coupled to the diaphragm; and a low friction material that is disposed in a sliding portion formed by the voice coil and the magnetic circuit, and includes polymer compounds swollen with liquid.

A speaker includes a holder having a receiving space, a magnetic circuit unit and a vibration unit. The vibration unit includes a diaphragm, a voice coil driving the diaphragm to vibrate, and a centering support member. The centering support member includes a connecting portion between the upper diaphragm and the voice coil, extension portions extending from two ends of the connecting portion and towards the magnetic circuit unit, and body portions each formed by extending from an tail end of each extension portion while being bent in a direction facing away from the extension portion. The connecting portion is interposed between the diaphragm and the voice coil. The extension portion is located between the magnetic circuit unit and the holder. An end the body portion is connected to the holder, and the other end is connected to the voice coil to support the voice coil.

A speaker includes a holder, a magnetic circuit unit, and a vibration unit including a diaphragm, a voice coil, and a centering support plate. The centering support plate is fixed to a side of the voice coil facing away from the diaphragm. One end of the centering support plate fixed to the voice coil is provided with a pad electrically connected to the voice coil. The diaphragm includes a central portion, a suspension portion surrounding the central portion, and a dome fixed to the central portion. The dome includes a body attached to the central portion, and a connection portion extending from an edge of the body towards the pad and fixedly connected to the pad. With the connection portion, the pad of the centering support plate can be fixed, preventing the tone quality of the speaker from being damaged by the pad, and t reducing noise.

The present invention provides a speaker, which includes a basket, a vibration system and a magnetic circuit system. The magnetic circuit system includes a magnetic frame, the magnetic frame and the basket define an accommodating space for accommodating the magnetic circuit system and the vibration system. The magnetic frame includes a magnetic frame bottom wall, a magnetic frame side wall extending from an outer side of the magnetic frame bottom wall towards the basket, and an extended portion extending from the magnetic frame side wall towards an outer side, the extended portion is provided with a plurality of protrusions formed by a semi-shearing process and protruding towards the basket, and an opening hole which is clamped and fixed with the protrusion is provided in a bottom wall of the basket. The speaker of the present disclosure has advantages of a stable structure size and suitability for accurate locating.

An electrodynamic acoustic transducer (1a . . . 1c) is presented, which comprises a housing (2), a membrane (3), a coil arrangement (6a . . . 6f) attached to the membrane (3) and a magnet system (9, 10, 11). The coil arrangement (6a . . . 6f) comprises a plurality of coils (7, 8) each having two terminals (T7, T8, T7a, T8a, T7b, T8b, T78) being static in relation to the housing (2). At least one pair of coils (7, 8) has one terminal (T78) in common, whereas the remaining terminals (T7, T8, T7a, T8a, T7b, T8b) are individual terminals (T7, T8, T7a, T8a, T7b, T8b). Connecting wires (12, 13, 12a, 13a, 12b, 13b) connect the coils (7, 8) with the individual terminals (T7, T8, T7a, T8a, T7b, T8b), and a conductive layer or path (14a . . . 14g) attached to the membrane (3) electrically connects the coils (7, 8) with the common terminal (T78).