Patent Publication Number: US-11641549-B2

Title: Sounding device

Description:
TECHNICAL FIELD 
     The present invention relates to the acoustic and electrical field, and in particular to a sounding device. 
     BACKGROUND ART 
     With the advent of the Internet era, the number of mobile terminal devices is continuously increasing. Among mobile devices, mobile phones are undoubtedly the most common and most portable mobile terminal devices. Sounding devices for playing sound, such as music, are widely used in mobile terminal devices such as mobile phones, vibration systems in the sounding devices are particularly important, and the entire sounding device vibrates and generates sound through the vibration system. 
     A sounding device in the related art comprises a frame, a vibration system fixed to the frame, and a magnetic circuit system for driving the vibration system to vibrate and generate sound, wherein the magnetic circuit system has a magnetic gap, and the vibration system comprises a diaphragm fixed to the frame, a voice coil inserted into the magnetic gap for driving the diaphragm to vibrate, a framework connected to the diaphragm and supporting and suspending the voice coil below the diaphragm, and an elastic conductor connected to the side of the framework away from the diaphragm, and the voice coil comprises lead wires electrically connected to the elastic conductor; and the magnetic circuit system comprises a yoke and a magnet fixed to the yoke, and the magnet comprises a main magnet and auxiliary magnets forming a magnetic gap with the main magnet. 
     However, in the related art, after the elastic conductor is bent and deformed, due to the difference in materials of various layers, residual stress is distributed non-linearly, so that elastic deformation cannot be fully recovered, and the fluctuation range of corresponding bending angles is large, resulting in insufficient precision of pad positions. 
     Therefore, there is a need to provide a new sounding device to solve the above problems. 
     SUMMARY OF THE INVENTION 
     The object of the present invention is to provide a sounding device in which the stress on inner and outer surfaces of bent areas of an elastic conductor is reduced, bending angles are stabilized, springback is reduced, pad positions are precise, and performance is better. 
     To achieve the above object, the present invention provides a sounding device, comprising a frame, a vibration system fixed to the frame, and a magnetic circuit system configured to drive the vibration system to vibrate to produce sound, wherein the magnetic circuit system has a magnetic gap, and the vibration system comprises a diaphragm fixed to the frame, a voice coil inserted into the magnetic gap to drive the diaphragm to vibrate, a framework connected to the diaphragm, and an elastic conductor fixed to the frame and connected to one side of the framework away from the diaphragm, wherein the framework and the voice coil define a receiving space, and the elastic conductor comprises an elastic conductor body fixed to the frame and connected to one side of the framework away from the diaphragm, a connection arm bending and extending from the elastic conductor body to the receiving space along the framework, and a pad portion connected to the connection arm; the connection arm comprises a first connection portion extending from the elastic conductor body to the voice coil, a first bending portion bending and extending from the first connection portion to the diaphragm, a second connection portion extending from the first bending portion to the diaphragm, a second bending portion bending and extending from the second connection portion to the voice coil, and a third connection portion extending from the second bending portion to the voice coil; the pad portion is connected to the third connection portion; and a covering film is attached to both an inside surface and an outside surface of the connection arm, and the covering film is removed from an inside surface and/or an outside surface of the first bending portion and the second bending portion. 
     Optionally, the framework comprises a bottom wall fixed to the diaphragm and a sidewall bending and extending in a direction from the bottom wall to the magnetic circuit system, and one side of the sidewall away from the diaphragm is fixedly connected to the elastic conductor body. 
     Optionally, the bottom wall has a ring shape, and the sidewall comprises a first sidewall bending and extending in a direction from the outer periphery of the bottom wall to the magnetic circuit system and a second sidewall bending and extending in a direction from the inner periphery of the bottom wall to the magnetic circuit system; and the first sidewall is connected to the elastic conductor body, the second sidewall is connected to the voice coil, the first sidewall is spaced from and opposite to the voice coil, and the bottom wall, the first sidewall, and the voice coil define the receiving space. 
     Optionally, the pad portion comprises a first pad and a second pad that extend away from each other, the connection arm, the first pad, and the second pad are all accommodated in the receiving space, the second connection portion is disposed parallel to and spaced from the first sidewall, and the third connection portion, the first pad, and the second pad are all connected to the side of the bottom wall close to the voice coil. 
     Optionally, the voice coil has a racetrack shape, has lead wires and comprises a pair of minor-axis sides and a pair of major-axis sides, the at least one first sidewall comprises two first sidewalls that are spaced apart from each other and that are respectively located on the pair of minor-axis sides of the voice coil, and the second sidewall is ring-shaped and connected to one end of the voice coil close to the diaphragm, and the lead wires are fixedly and electrically connected to the first pad and the second pad respectively. 
     Optionally, the at least one elastic conductor comprises two elastic conductors, which are disposed on two minor-axis sides of the voice coil respectively. 
     Optionally, the elastic conductor body comprises a first fixed portion fixed to one side of the frame away from the diaphragm, a second fixed portion fixed to one end of the first sidewall away from the diaphragm, and an elastic arm connecting the first fixed portion and the second fixed portion, and the connection arm is fixedly connected to the second fixed portion. 
     Optionally, the vibration system further comprises an assistant diaphragm attached to one side of the elastic conductor away from the diaphragm. 
     Optionally, the magnetic circuit system comprises a yoke, a main magnet fixedly disposed on the yoke, an auxiliary magnet disposed around the main magnet and spaced from the main magnet to form the magnetic gap, a first magnetic conductive plate covering and fixed to the main magnet, and a second magnetic conductive plate covering and fixed to the auxiliary magnet, and the second magnetic conductive plate is provided with avoiding portions at corresponding positions of the first pad and the second pad. 
     Optionally, the diaphragm comprises a vibration portion with a through hole, a suspension portion extending from the periphery of the vibration portion and surrounding the vibration portion, a fixed portion bending and extending from one side of the suspension portion away from the vibration portion and fixed to the frame, and a dome; wherein the vibration portion surrounds and is spaced from the dome, and the bottom wall is located between the dome and the vibration portion and connects the vibration portion and the dome. 
     Compared with the related art, in the sounding device of the present invention, the elastic conductor comprises an elastic conductor body fixed to the frame and connected to one end of the framework away from the diaphragm, a connection arm bending and extending from the elastic conductor body to the receiving space along the framework, and a pad portion connected to the connection arm; the connection arm comprises a first connection portion extending from the elastic conductor body to the voice coil, a first bending portion bending and extending from the first connection portion to the diaphragm, a second connection portion extending from the first bending portion to the diaphragm, a second bending portion bending and extending from the second connection portion to the voice coil, and a third connection portion extending from the second bending portion to the voice coil; the pad portion is connected to the third connection portion; and a covering film is attached to both an inside surface and an outside surface of the connection arm, and the covering film is removed from an inside surface and/or an outside surface of the first bending portion and the second bending portion. Removal of the covering film reduces the stress on inner and outer surfaces of bent areas of the elastic conductor, so that bending angles are stabilized, springback is reduced, pad positions are precise, and performance of the sounding device is improved. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       To illustrate the technical solutions in the embodiments of the present invention more clearly, a brief introduction to the accompanying drawings required for describing the embodiments will be made below. Obviously, the accompanying drawings in the following description show merely some embodiments of the present invention, and those of ordinary skills in the art may derive other drawings from these accompanying drawings without any creative effort, in which: 
         FIG.  1    is a schematic exploded view of a structure of a sounding device according to the present invention; 
         FIG.  2    is a schematic structural view of an elastic conductor of the sounding device according to the present invention; 
         FIG.  3    is a schematic view of partial assembly of the sounding device according to the present invention; 
         FIG.  4    is a schematic diagram of a three-dimensional structure of the sounding device according to the present invention; 
         FIG.  5    is a cross-sectional view of the sounding device taken along the line A-A in  FIG.  4    according to the present invention; 
         FIG.  6    is a schematic enlarged view of Part B in  FIG.  5    according to the present invention; 
         FIG.  7    is a schematic structural view of a connection arm of the elastic conductor according to the present invention; and 
         FIG.  8    is a schematic structural view of the elastic conductor and a second magnetic conductive plate according to the present invention. 
     
    
    
     DETAILED DESCRIPTION OF EMBODIMENTS 
     The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings for the embodiments of the present invention; and obviously, the embodiments described are merely some, rather than all, of the embodiments of the present invention. All other embodiments obtained by those of ordinary skills in the art based on the embodiments of the present invention without any creative efforts shall all fall within the protection scope of the present invention. 
     Referring to  FIGS.  1 - 8   , the present invention provides a sounding device  100 . The sounding device  100  comprises a frame  1 , a vibration system and a magnetic circuit system  3  that are fixed to the frame  1  respectively, wherein the magnetic circuit system  3  drives the vibration system to vibrate and generate sound and has a magnetic gap  30 . 
     Specifically, the vibration system comprises a diaphragm  21  fixed to the frame  1 , a voice coil  22  inserted into the magnetic gap  30  for driving the diaphragm  21  to vibrate, a framework  23  connected to the diaphragm  21 , an elastic conductor  24  fixed to the frame  1  and connected to the side of the framework  23  away from the diaphragm  21 , and an assistant diaphragm  25 . The framework  23  and the voice coil  22  define a receiving space  10 . 
     The diaphragm  21  comprises a vibration portion  211  having a through hole  2110 , a suspension portion  212  extending from the periphery of the vibration portion  211  and surrounding the vibration portion  211 , and a fixed portion  213  bending and extending from the suspension portion  212  to the side away from the vibration portion  211  and fixed to the frame  1 , and a dome  214 . The vibration portion  211  surrounds and is spaced from the dome  214 . 
     The voice coil  22  has a racetrack shape, with one end away from the diaphragm  21  inserted into the magnetic gap  30 , and comprises a pair of minor-axis sides  221  that are spaced from each other and a pair of major-axis sides  222  that are spaced from each other. The minor-axis sides  221  have two lead wires  2211 . 
     The framework  23  comprises a bottom wall  231  that is fixed to the vibration portion  211  and has a ring shape, and a sidewall  232  that bends and extends in a direction from the bottom wall  231  to the magnetic circuit system  3 . 
     Specifically, the sidewall  232  comprises a first sidewall  2321  bending and extending in a direction from the outer periphery of the bottom wall  231  to the magnetic circuit system  3  and a second sidewall  2322  bending and extending in a direction from the inner periphery of the bottom wall  231  to the magnetic circuit system  3 . There are two first sidewalls  2321 , which are disposed on two opposite sides of short shafts of the voice coil  22  in a spaced manner, the second sidewall  2322  has a ring shape and is connected to the voice coil  22 , and the second sidewall  2322  is connected to one end of the voice coil  22  that is close to the diaphragm  21 . 
     The first sidewall  2321  is spaced from and opposite to the voice coil  22 , and the bottom wall  231 , the first sidewall  2321 , and the voice coil  22  define the receiving space  10 . 
     Specifically, the bottom wall  231  is located between the dome  214  and the vibration portion  211  and connects the vibration portion  211  and the dome  214  to form an integral structure, which is more reliable. 
     There are two elastic conductors  24 , which are disposed on two minor-axis sides of the voice coil  22  respectively. The elastic conductor  24  comprises an elastic conductor body  241  fixed to the frame  1  and connected to one end of the framework  23  away from the diaphragm  21 , a connection arm  242  bending and extending from the elastic conductor body  241  to the receiving space  10  along the framework  23 , and a pad portion connected to the connection arm  242 . The pad portion comprises a first pad  243  and a second pad  244  that are formed by extending the connection arm  242  outward away from each other. The lead wires  2211  of the voice coil  22  are fixedly and electrically connected to the sides of the first pad  243  and the second pad  244  away from the diaphragm, respectively. 
     Specifically, the connection arm  242  comprises a first connection portion  2421  extending from the elastic conductor body  241  to the voice coil  22 , a first bending portion  2422  bending and extending from the first connection portion  2421  to the diaphragm  21 , a second connection portion  2423  extending from the first bending portion  2422  to the diaphragm  21 , a second bending portion  2424  bending and extending from the second connection portion  2423  to the voice coil  22 , and a third connection portion  2425  extending from the second bending portion  2424  to the voice coil  22 . The first pad  243  and the second pad  244  are disposed on two sides of the third connection portion  2425  respectively. A covering film  2420  is attached to an inside surface and an outside surface of the connection arm  242 , and the covering film  2420  is removed from an inside surface and/or an outside surface of the first bending portion  2422  and the second bending portion  2424 . Removal of the covering film  2420  reduces the stress on inner and outer surfaces of bent areas of the elastic conductor  24 , so that bending angles of the elastic conductor  24  are stabilized, springback is reduced, positions of the first pad  243  and the second pad  244  are precise, and performance of the sounding device is improved. 
     The second connection portion  2423  is disposed parallel to and spaced from the first sidewall  2321 . The third connection portion  2425  extends outward away from each other to form the first pad  243  and the second pad  244 , and all three are connected to the side of the bottom wall  231  close to the voice coil  22 . 
     The elastic conductor body  241  comprises a first fixed portion  2411  fixed to the side of the frame  1  away from the diaphragm  21 , a second fixed portion  2413  fixed to one end of the first sidewall  2321  away from the diaphragm  21 , and an elastic arm  2412  connecting the first fixed portion  2411  and the second fixed portion  2413 . The connection arm  242  is fixedly connected to the second fixed portion  2413 . 
     There are two assistant diaphragms  25 , which are respectively attached to the side of the elastic conductor  24  away from the diaphragm  21 . 
     The magnetic circuit system  3  comprises a yoke  31 , a main magnet  32  fixedly disposed on the yoke  31 , an auxiliary magnet  33  disposed around the main magnet  32  and spaced from the main magnet  32  to form the magnetic gap  30 , a first magnetic conductive plate  34  covering and fixed to the main magnet  32 , and a second magnetic conductive plate  35  covering and fixed to the auxiliary magnet  33 . The second magnetic conductive plate  35  is fixedly connected to the side of the frame  1  away from the diaphragm  21  and is provided with avoiding portions  350  at corresponding positions of the first pad  243  and the second pad  244 , such that when the sounding device vibrates and generates sound, the second magnetic conductive plate  35  will not collide with the first pad  243  and the second pad  244 , without affecting electrical connections between the two and the lead wires  2211 , thereby improving the safety of the sounding device. 
     Compared with the related art, in the sounding device of the present invention, the elastic conductor comprises an elastic conductor body fixed to the frame and connected to one end of the framework away from the diaphragm, a connection arm bending and extending from the elastic conductor body to the receiving space along the framework, and a pad portion connected to the connection arm; the connection arm comprises a first connection portion extending from the elastic conductor body to the voice coil, a first bending portion bending and extending from the first connection portion to the diaphragm, a second connection portion extending from the first bending portion to the diaphragm, a second bending portion bending and extending from the second connection portion to the voice coil, and a third connection portion extending from the second bending portion to the voice coil; the pad portion is connected to the third connection portion; and a covering film is attached to both an inside surface and an outside surface of the connection arm, and the covering film is removed from an inside surface and/or an outside surface of the first bending portion and the second bending portion. Removal of the covering film reduces the stress on inner and outer surfaces of bent areas of the elastic conductor, so that bending angles are stabilized, springback is reduced, pad positions are precise, and performance of the sounding device is improved. 
     The above descriptions provided in the present invention are merely embodiments of the present invention, and not intended to limit the patent scope of the present invention thereby, and any equivalent structure or equivalent process variations made by using the contents of the description and accompanying drawings are applied directly or indirectly in other relevant technical fields and also included in the scope of patent protection of the present invention.