Acoustic device

The present invention provides an acoustic device including a frame, a vibration system and a magnetic system. The vibration system includes a diaphragm, a voice coil assembly, and a support assembly. The support assembly includes a flexible circuit board and a support membrane. The flexible circuit board includes a first fixing end secured to the frame, a second fixing end secured to the voice coil assembly, a connecting portion, and a soldering pad. The voice coil assembly includes a first voice coil and a second voice coil. The first voice coil includes a first leading wire. The first leading wire has a first extension part extending from a surface of the first voice coil, a second extension part bending and extending from the first extension part along an outer surface of the second voice coil, and a soldering part welding to the soldering pad.

FIELD OF THE PRESENT INVENTION

The present invention relates to electro-acoustic transducers, and more particularly, to an acoustic device used in electronic speaker box products.

DESCRIPTION OF RELATED ART

With the rapid development of wireless communication technologies, mobile phone and other consumer electronic products are widely used. Acoustic devices are also known as speakers or horns, and are often used in these products. Specifically, they are used in speaker boxes to convert audio signals into sound for playback. As customers' requirements for consumer electronic products increase, more requirements are given to acoustic devices.

In related art, the acoustic device usually includes a frame, a vibration system supported on the frame, and a magnetic circuit system having a magnetic gap. The magnetic system drives the vibration system to generate sounds. The vibration system includes a diaphragm fixed to the frame and a voice coil at least partially located in the magnetic gap. In order to improve a performance of the acoustic device and output a larger sound pressure level (SPL), a double voice coil can be used as a driver in the acoustic device, that is, an inner voice coil is disposed inside the conventional voice coil. In this way, when the acoustic device is working, the two voice coils work at the same time, providing a larger driving force to the diaphragm, which can effectively improve the performance of the acoustic device. However, there is a technical difficulty in the dual-voice coil speaker, which is the problem of how to arrange a leading wire of the inner voice coil.

Therefore, it is desired to provide a new acoustic device which can overcome the above problems.

SUMMARY

In view of the above, the embodiments of the present invention provide a new acoustic device with stable structure.

The present invention provides an acoustic device, including a frame, a vibration system and a magnetic system supported on the frame respectively. The vibration system includes a diaphragm, a voice coil assembly driving the diaphragm to generate sounds, and a support assembly connecting the frame and the voice coil assembly. The support assembly includes a flexible circuit board mounted on a side of the voice coil assembly away from the diaphragm and a support membrane mounted on a side of the flexible circuit board away from the frame. The flexible circuit board includes a first fixing end secured to the frame, a second fixing end secured to the voice coil assembly, a connecting portion connecting the first fixing end and the second fixing end, and a soldering pad extending from the connecting portion. The voice coil assembly includes a first voice coil with an annular shape and a second voice coil surrounding an outer periphery of the first voice coil. The first voice coil includes a first leading wire. The first leading wire includes a first extension part extending from a surface of the first voice coil closed to the diaphragm and extending out of an outer edge of the second voice coil, a second extension part bending and extending from the first extension part along an outer surface of the second voice coil, and a soldering part welding to the soldering pad.

As an improvement, the acoustic device is rectangular, and each side along a direction of a short axis of the voice coil assembly is provided with one support assembly, the first leading wire extending from a short axis of the first voice coil.

As an improvement, the diaphragm comprises a dome and a suspension connecting to the dome, the suspension comprising a flat portion attached to the dome, a suspension portion bending and extending around the flat portion, and a mounting portion extending outward from the suspension portion, an avoiding portion is disposed on the flat portion corresponding to a position of the first leading wire.

As an improvement, the avoiding portion passing through an upper surface and a lower surface of the flat portion.

As an improvement, the second voice coil comprises a second leading wire extending from a surface of the second voice coil away from the diaphragm, and the second leading wire is welded to the soldering pad.

As an improvement, the magnetic circuit system comprises a yoke, a main magnet mounted on the yoke, and a first auxiliary magnet spaced apart from the main magnet for forming a first magnetic gap, and second auxiliary magnet spaced apart from the first auxiliary magnet for forming a second magnetic gap, at least a part of the first voice coil located in the first magnetic gap, and at least a part of the second voice coil located in the second magnetic gap.

As an improvement, the first auxiliary magnet is a hollow annular structure.

As an improvement, the acoustic device further comprises a conductive member embedded in the frame, and the conductive member is connected to the soldering pad of the flexible circuit board.

DETAILED DESCRIPTION OF THE EXEMPLARY EMBODIMENTS

The present invention will hereinafter be described in detail with reference to exemplary embodiments. To make the technical problems to be solved, technical solutions and beneficial effects of the present invention more apparent, the present invention is described in further detail together with the figures and the embodiments. It should be understood the specific embodiments described hereby is only to explain the disclosure, not intended to limit the disclosure.

Referring to theFIGS.1-6, the present invention provides one embodiment of an acoustic device100. The acoustic device100includes a frame1, a vibration system2, a magnetic circuit system3supported on the frame1, and a conductive member4embedded in the frame1. The vibration system2and the magnetic circuit system3are supported on the frame1respectively, and the magnetic circuit system3drives the vibration system2to generate sounds. The frame1is a rectangular annular hollow structure.

The vibration system2includes a diaphragm21, a voice coil assembly22driving the diaphragm21to generate sounds, and a support assembly23connecting the frame1and the voice coil assembly22.

The diaphragm21comprises a dome211and a suspension212connecting to the dome211. The suspension212comprises a flat portion2121attached to the dome211, a suspension portion2122bending and extending around the flat portion2121, and a mounting portion2123extending outward from the suspension portion2122. The mounting portion2123is fixed and connected to the frame1.

The voice coil assembly22includes a first voice coil221with an annular shape and a second voice coil222surrounding an outer periphery of the first voice coil221. The first voice coil221includes a first leading wire223. The first leading wire223includes a first extension part224extending from a surface of the first voice221closed to the diaphragm21and extending out of an outer edge of the second voice coil222, a second extension part225bending and extending from the first extension part224along an outer surface of the second voice coil222, and a soldering part226extending from the second extension part225. The first leading wire223abuts against and is supported on a surface of the second voice coil222proximal to the diaphragm21. The second voice coil222includes a second leading wire227extending from a surface of the second voice coil222distal to the diaphragm21.

An avoiding portion2124is disposed on the flat portion2121of the suspension212of the diaphragm21corresponding to a position of the first leading wire223. The avoiding portion2124passes through an upper surface and a lower surface of the flat portion2121. Optionally, in other embodiments, the avoiding portion2124can also be a concave structure formed from a recession on the lower surface of the flat portion2121, and may not penetrate through the upper surface of the flat portion2121.

The support assembly23includes a flexible circuit board231mounted on a side of the voice coil assembly22away from the diaphragm21and a support membrane232mounted on a side of the flexible circuit board231away from the frame1. The flexible circuit board231includes a first fixing end2311secured to the frame1, a second fixing end2312secured to the voice coil assembly22, a connecting portion2313connecting the first fixing end2311and the second fixing end2312, and a soldering pad2314extending from the connecting portion2313. Both the first leading wire223and the second leading wire227are welded to the soldering pad2314. In detail, the soldering part226of the first leading wire223is welded to the soldering pad2314. The conductive member4is connected to the soldering pad2314of the flexible circuit board231to provide electrical connection for the first voice coil221and the second voice coil222. In present embodiment, the number of the soldering pads2314is two, and the number of the conductive members4is also two, and each soldering pad2314is connected to the corresponding conductive member4.

The acoustic device100is rectangular, and each side along a direction of a short axis of the voice coil assembly22is provided with one support assembly23, and the first leading wire223extends from a short axis of the first voice coil221and is fixedly welded to the flexible circuit board231located on the short axis.

Optionally, the support assembly23can be also arranged along a long axis of the voice coil assembly22, but in this way, an overall length of the first leading wire of the first voice coil will be elongated, and a stability of a leading fixing structure will be worse than the structure that the support assembly disposed on the short axis of the voice coil assembly.

The magnetic circuit system3comprises a yoke31, a main magnet32mounted on the yoke31, and a first auxiliary magnet33spaced apart from the main magnet32for forming a first magnetic gap301, and second auxiliary magnet34spaced apart from the first auxiliary magnet33for forming a second magnetic gap302, a main pole plate35covered on the main magnet32, a first auxiliary pole plate36covered on the first auxiliary magnet33, and a second auxiliary pole plate37covered on the second auxiliary magnet34. At least a part of the first voice coil221is located in the first magnetic gap301, and at least a part of the second voice coil222is located in the second magnetic gap302. A part of the second auxiliary pole plate37is embedded in the frame1. The first auxiliary magnet33is a hollow annular structure, and the first auxiliary pole plate36is also a hollow annular structure.

The first voice coil221of the present invention, that is, an inner voice coil of the present invention, leading the first leading wire223across an upper surface (the surface close to the diaphragm21) of an outer voice coil (the second voice coil), to an outer peripheral surface of the outer voice coil, and then bending and extending the first leading wire223to the flexible circuit board231and is fixedly connected with the soldering pad2314of the flexible circuit board231. The second voice coil222, that is, the outer voice coil, directly leading the second leading wire227from a lower surface (the surface away from the diaphragm21) of the outer voice coil (second voice coil), to the flexible circuit board231and is fixedly connected with the soldering pad2314of the flexible circuit board231. In this way, the leading wires of the inner and outer voice coils do not interfere with each other, and each can be stably connected to the soldering pad, which improves the stability of the acoustic device. And the leading wires are not easy to fall off when the inner and outer voice coils vibrate.

Comparing with the related art, in present invention, the acoustic device includes a frame, a vibration system and a magnetic system supported on the frame respectively. The vibration system includes a diaphragm, a voice coil assembly driving the diaphragm to generate sounds, and a support assembly connecting the frame and the voice coil assembly. The support assembly includes a flexible circuit board mounted on a side of the voice coil assembly away from the diaphragm and a support membrane mounted on a side of the flexible circuit board away from the frame. The flexible circuit board includes a first fixing end secured to the frame, a second fixing end secured to the voice coil assembly, a connecting portion connecting the first fixing end and the second fixing end, and a soldering pad extending from the connecting portion. The voice coil assembly includes a first voice coil with an annular shape and a second voice coil surrounding an outer periphery of the first voice coil. The first voice coil includes a first leading wire. The first leading wire includes a first extension part extending from a surface of the first voice coil closed to the diaphragm and extending out of an outer edge of the second voice coil, a second extension part bending and extending from the first extension part along an outer surface of the second voice coil, and a soldering part welding to the soldering pad. In present invention, leading the leading wire of the inner voice coil to outside of the outer voice coil across the surface close to the diaphragm, and then bending and leading the leading wire to the soldering pad. In this way, the inner voice coil can be firmly fixed even if the leading wire is long, and it is not easy to fall off during the vibration of the voice coils.