Sound generator

The present invention provides a sound generator, including a magnetic circuit system having a magnet and a lower plate for carrying the magnet. The magnet includes a first surface opposite to the lower plate and a second surface opposite to the first surface. The first surface of the magnet protrudes to form a first bolt, the lower plate is provided with a lower plate jack matching with the first bolt, and the first bolt is inserted into the lower plate jack. The sound generator of the present disclosure improves the structural stability of the magnetic circuit system and is convenient for positioning.

FIELD OF THE PRESENT DISCLOSURE

The embodiments of the invention relate to the electroacoustic components, in particular to a sound generator used in a portable device.

DESCRIPTION OF RELATED ART

Sound generators, also called sound generators, are widely used in portable electronic devices such as mobile phones, laptops, etc. With the rapid development of these portable electronic devices, people have higher and higher requirements for the performance of the sound generators. In addition, with the thinning development of mobile phones, the quality requirements for the sound generators in the mobile phones are becoming higher and higher. The sound generator is a playing device of the voice function and therefore its internal magnetic circuit system directly influences the improvement of the acoustic performance of the product.

In the sound generator of the related technology, the connection between the magnet and the lower plate, and the connection between the magnet and the pole plate are performed by glue with planar surfaces thereof attached to each other. When the sound generator drops, the structure is easy to have the problem that the glue loses effectiveness, which causes the disconnection between the pole plate and magnet, and the disconnection between the magnet and lower plate. The drop reliability is lower, and the structure stability is poor, which badly affects the acoustic performance of the sound generator. Thus, it is necessary to provide improved sound generator to solve the problems mentioned above.

DETAILED DESCRIPTION OF THE EXEMPLARY EMBODIMENT

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

The following specific embodiment is provided to make the readers understand the contents of the present disclosure clearer and more thoroughly but not restrict the present disclosure, wherein, the upper, lower, left and right words indicating directions only refer to the position of the structure shown in the corresponding figure. The one near the center of the sound generator is defined inner side, and the one far from the center of the sound generator is defined the outer side.

As shown inFIGS. 1-3, the present disclosure provides a sound generator, which comprises a vibration system1, a magnetic circuit system2below the vibration system1and a frame3to fix the magnetic circuit system2. The vibration system1includes a diaphragm11fixed on one side of the frame3and a voice coil13to drive the diaphragm11to vibrate and generate sound. The magnetic circuit system2includes a magnet23, a lower plate21for carrying the magnet23, and a pole plate on a top of the magnet23deviating from lower plate21. The magnet23includes a main magnet231and a side magnet233spaced from the main magnet231. The pole plate includes a main pole plate25corresponding to the main magnet231and an upper plate27corresponding to the side magnet233.

The structure of the magnetic circuit system2is improved by the present disclosure so that the pole plate will not be separated from the magnet23and the magnet23will not be separated from the lower plate21due to glue failure, and the specific embodiment is recited as follows.

In the present embodiment, a surface of the main magnet231engaged with the lower plate21(i.e., facing the lower plate21) is defined as a first surface, and a surface of the main magnet231engaged with the main pole plate25(opposite from the first surface) is defined as a second surface. As shown inFIG. 2, the upper surface of lower plate21is attached with the main magnet231and side magnet233locating on both sides of main magnet231and spaced from the main magnet231. The first and second surfaces of the main magnet231protrude respectively to form a first bolt235and a second bolt237. The first bolt235protrudes downward the lower plate21from the lower surface of the main magnet231and the second bolt237protrudes towards the main pole plate25from the upper surface of main magnet231. The upper surface of lower plate21is further provided with a first lower plate jack211matching the shape of the first bolt235; the main pole plate25is provided with a pole plate jack251matching the shape of the second bolt237. The first bolt235is inserted into the first lower plate jack211and the second bolt237is inserted into the pole plate jack251to form insertion contact, so that the main magnet231is fixed with the lower plate21and the main pole plate25, and the contact area therebetween is increased, thus forming an insertion structure. The structure enhances the stability of the structure and the transfer area of the magnetic flux.

In addition, the lower plate21also includes a second lower plate jack213and a third lower plate jack215spaced from the first lower plate211. In the embodiment, the first lower plate jack211is preferably located in the central area of the lower plate21. The first lower plate jack211, the second lower plate jack213and the third lower plate jack215are concave from the upper surface to the lower surface of the lower plate21. These three jacks are distributed in the linear way and they can also be distributed in the triangular way, as shown inFIGS. 1 and 4. It should be noted that the jacks on the lower plate21(including the first lower plate jack211, the second lower plate jack213and the third lower plate jack215) and pole plate jack251can be through holes or blind holes.

Further, the hole depth of the first lower plate jack211is equal to the vertical distance the first surface of the main magnet23of the first bolt235protrudes towards the lower plate21. The hole depth of the pole plate jack251is equal to the vertical distance the second bolt237protrudes from the second surface of the main magnet23toward the main pole plate25. The hole depth of the first lower plate jack211is equal or unequal to that of the pole plate jack251.

As shown inFIGS. 1 and 4, the upper plate27is stacked on the side magnet233and the upper plate27is fixed on the frame3. The first surface of the side magnet233opposite to the lower plate21is provided with a third bolt232protruding from the first surface to the lower plate21. The second surface of the side magnet233opposite to the upper plate27is provided with a fourth bolt234. The upper plate27is provided with an upper plate jack271matching the shape of the fourth bolt234. In the present embodiment, two side magnets233are provided and the two side magnets233are symmetrically arranged on both sides of the main magnet231. Two third bolts232are inserted into the second lower plate jack213and the third lower plate jack215respectively. The two fourth bolts234are inserted into two upper plate jacks271respectively so that side magnet233and the upper plate27and the lower plate21are fixed in the inserting way. It should be noted that the upper plate jack271can be a through hole or a blind hole. The structure enhances the stability of the structure for processing and positioning, for avoiding expansion of gluing area due to assembly dislocation, and improving drop reliability.

In the case of fixed bonding, the contact area (i.e. bonding area) between the side magnet233and the upper plate27and the lower plate21, between the main magnet231and the main pole plate25and the lower plate21can be increased by the concave-convex structure of the bolts and sockets, and bonding strength can be increased, and structural stability of magnetic circuit system can be improved accordingly.

As can be seen fromFIG. 4, the hole depth of the second lower plate jack213can be equal or unequal to the vertical distance the third bolt232protrudes from the first surface of the side magnet233towards the lower plate21. The hole depth of the upper plate jack271can be equal or unequal to the vertical distance the fourth bolt234protrudes from the second surface of the side magnet233towards the upper plate27. The hole depth of the second lower plate jack213can be equal or unequal to the hole depth of the upper plate jack271.

It should be noted that the hole depths of the first lower plate jack211, the second lower plate jack213and the third lower plate jack215may be equal or unequal; in this embodiment, the cross-section of all the jacks can be circular, triangular, square, or in other shapes.

Further, the voice coil13is disposed around the main magnet231, and draws the magnetic flux of the main magnet231out through the lower plate21and the main pole plate25to form magnetic field, so that the voice coil13is in the magnetic field. Specifically, the voice coil13is in ring shape and the voice coil13is partially located in the magnetic gap. After the voice coil13is electrified, the voice coil13vibrates due to Ampere Force produced by the magnetic field.