Patent Publication Number: US-11665480-B2

Title: Speaker

Description:
TECHNICAL FIELD 
     The present disclosure relates to the field of electro-acoustic conversion, in particular to a speaker for a portable electronic device. 
     BACKGROUND 
     As one of the main components of mobile terminals such as mobile phones and headphones, speakers are used to convert electrical signals into sound signals. 
     In the related art, a speaker includes a frame, a vibration unit fixed to the frame and a magnetic circuit unit provided with a magnetic gap. The vibration unit includes a diaphragm fixed to the frame and a voice coil inserted in the magnetic gap to drive the diaphragm to vibrate and produce sound. 
     The frame uses a thin steel ring in order to make full use of the internal space. To avoid the integral molding of the frame and the rubber mold and the height of the frame from affecting reliability, a rubber edge is provided on the outer side of the frame to increase the bonding force between the rubber and the frame. However, the diaphragm occupies the space on the outer peripheral side of the frame, resulting in an increase in the size of the outer peripheral side of the speaker, which is not conducive to the miniaturization of the terminal product. 
     Therefore, it needs to provide a speaker to solve the above technical problem. 
     SUMMARY 
     An objective of the present disclosure is to provide a reliable and miniaturized speaker. 
     An embodiment of the present disclosure provides a speaker, including: a frame; a vibration unit fixed to the frame; and a magnetic circuit unit driving the vibration unit to vibrate and provided with a magnetic gap. The vibration unit includes a diaphragm fixed to the frame and a voice coil inserted in the magnetic gap to drive the diaphragm to vibrate and produce sound; an outer periphery of the diaphragm bends and extends to form at least one fixing portion; and the at least one fixing portion extends along a vibrating direction of the diaphragm and is attached to an inner peripheral side of the frame. 
     As an improvement, the diaphragm includes a first suspension having a ring shape, a second suspension having a ring shape and a vibrating portion having a ring shape; the first suspension surrounds and is spaced apart from the second suspension; and an outer periphery of the vibrating portion is fixed to a side of the first suspension close to the second suspension, and an inner periphery of the vibrating portion is fixed to a side of the second suspension close to the first suspension; and each of the at least one fixing portion includes a first fixing portion extending from an outer periphery of the first suspension and attached to the inner peripheral side of the frame, and a supporting portion extending from the first fixing portion; and the supporting portion includes a first supporting portion extending from the first fixing portion toward the magnetic circuit unit along the vibrating direction and attached to the inner peripheral side of the frame, and a second supporting portion extending from the first fixing portion in a direction away from the magnetic circuit unit along the vibrating direction and attached to the inner peripheral side of the frame. 
     As an improvement, the first suspension has a rectangular structure with round corners; and the at least one fixing portion includes two fixing portions, which are located at two opposite sides of the first suspension. 
     As an improvement, the two fixing portions are located at two short edges of the first suspension; the diaphragm further includes reinforcing portions formed at the round corners; two reinforcing portions of the reinforcing portions located at two ends of one of the two short edges are connected to two opposite ends of one of the fixing portions; and two ends of each of the reinforcing portions along the vibrating direction extend beyond the fixing portions. 
     As an improvement, upper and lower end surfaces of each of the reinforcing portions along the vibrating direction are lower than upper and lower end surfaces of the frame. 
     As an improvement, the speaker further includes a front cover covering sides of the reinforcing portions away from the magnetic circuit unit and fixed to an inner side of the frame; the front cover is spaced apart from the diaphragm to form a front chamber, and the front cover is provided with a sound hole, which communicates the front chamber with an exterior. 
     As an improvement, the frame includes a first frame and a second frame stacked to and fixed to the first frame along the vibrating direction; and the vibration unit is fixed to the second frame, and the magnetic circuit unit is fixed to the first frame. 
     As an improvement, the frame is made of a metal material. 
     As an improvement, the vibration unit further includes a holder fixed to the diaphragm, and one end of the holder extends into the magnetic gap to be fixed to and connected to the voice coil. 
     As an improvement, the magnetic circuit unit includes a yoke fixed in the frame, a first main magnet stacked to a side of the yoke close to the diaphragm, a first pole plate stacked to a side of the first main magnet close to the diaphragm, a second main magnet stacked to a side of the first pole plate close to the diaphragm, at least two auxiliary magnets stacked to a side of the yoke close to the diaphragm and spaced apart from the first main magnet to form the magnetic gap, and a second pole plate stacked to a side of each of the auxiliary magnets close to the diaphragm. 
     Compared with the related art, the speaker in the present disclosure includes a frame, a vibration unit fixed to the frame and a magnetic circuit unit driving the vibration unit to vibrate and provided with a magnetic gap; the vibration unit includes a diaphragm fixed to the frame and a voice coil inserted in the magnetic gap to drive the diaphragm to vibrate and produce sound; an outer periphery of the diaphragm bends and extends to form fixing portions, the fixing portions extend along a vibrating direction of the diaphragm and are attached to an inner peripheral side of the frame. With this structure, the bonding strength of the frame and the diaphragm is improved; in addition, the diaphragm does not occupy an outer space of the frame, and an appearance size of the speaker is effectively controlled, thereby facilitating the miniaturization design. 
    
    
     
       BRIEF DESCRIPTION OF DRAWINGS 
       To describe the technical solutions in the embodiments of the present disclosure more clearly, the drawings required for describing the embodiments are briefly described below. Apparently, the drawings in the following description show merely some embodiments of the present disclosure, and those of ordinary skill in the art may still derive other drawings from these drawings without creative efforts. 
         FIG.  1    is a three-dimensional view illustrating a structure of a speaker according to an embodiment of the present disclosure; 
         FIG.  2    is an exploded view of a speaker according to an embodiment of the present disclosure; 
         FIG.  3    is a sectional view taken along line A-A shown in  FIG.  1   ; and 
         FIG.  4    is an enlarged view of B shown in  FIG.  3   . 
     
    
    
     DETAILED DESCRIPTION OF EMBODIMENTS 
     The technical solutions of the embodiments of the present disclosure are described in detail below with reference to the drawings. Apparently, the described embodiments are merely some rather than all of the embodiments of the present disclosure. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present disclosure without creative efforts should fall within the protection scope of the present disclosure. 
     Referring to  FIG.  1    to  FIG.  4   , an embodiment of the present disclosure provides a speaker  100 . The speaker  100  includes a frame  1 , a vibration unit  2  and a magnetic circuit unit  3 . 
     The magnetic circuit unit  3  is provided with a magnetic gap  35 . The vibration unit  2  includes a diaphragm  21  fixed to the frame  1 , and a voice coil  24  driving the diaphragm  21  to vibrate and produce sound. The voice coil  24  is inserted in the magnetic gap  35 . The magnetic circuit unit  3  drives the voice coil  24  to produce sound, and the acoustic performance of the voice coil  24  is improved through the diaphragm  21 . 
     An outer periphery of the diaphragm  21  bends and extends to form fixing portions  214 . The fixing portions  214  extend along a vibrating direction of the diaphragm  21  and are attached to an inner peripheral side of the frame  1 . With this structure, the bonding strength of the frame  1  and the diaphragm  21  is improved; in addition, the diaphragm  21  does not occupy an outer space of the frame  1 , thereby effectively controlling an appearance size of the speaker  100 , and thus facilitating the miniaturization design. 
     The diaphragm  21  includes a ring-shaped first suspension  211 , a ring-shaped second suspension  213  and a ring-shaped vibrating portion  212 . The first suspension  211  surrounds and is spaced apart from the second suspension  213 . An outer periphery of the vibrating portion  212  is fixed to a side of the first suspension  211  close to the second suspension  213 , and an inner periphery of the vibrating portion  212  is fixed to a side of the second suspension  213  close to the first suspension  211 . An inner periphery of each of the fixing portions  214  is fixed to an outer periphery of the first suspension  211 , and an outer periphery of each of the fixing portions  214  is fixed to the frame  1 . 
     The fixing portions  214  each include a first fixing portion  2141  extending from the outer periphery of the first suspension  211  and attached to the frame  1 , and a supporting portion  2142  extending from the first fixing portion  2141 . A contact area between the fixing portions  214  and the inner peripheral side of the frame  1  is increased to improve the fixing effect between the diaphragm  21  and the frame  1 . By fixing the fixing portions  214  to the inner peripheral side of the frame  1 , the mounting space is saved, and the acoustic performance of the speaker is effectively improved. 
     The supporting portion  2142  includes a first supporting portion  21421  extending from the first fixing portion  2141  toward the magnetic circuit unit  3  along the vibrating direction and attached to the inner peripheral side of the frame  1 , and a second supporting portion  21422  extending from the first fixing portion  2141  in a direction away from the magnetic circuit unit  3  along the vibrating direction and attached to the inner peripheral side of the frame  1 . The first supporting portion  21421  and the second supporting portion  21422  respectively support the upper and lower sides of the first fixing portion  2141 , thereby improving the fixing effect between the diaphragm  21  and the frame  1 . 
     The first suspension  211  has a rectangular structure with round corners. Two fixing portions  214  are provided and arranged at two opposite sides of the first suspension  211 . 
     The two fixing portions  214  are located at two short edges of the first suspension  211 . The diaphragm  21  further includes reinforcing portions  2143  formed at the round corners. Two reinforcing portions  2143  located at two ends of a same short edge are connected to two opposite ends of one fixing portion  214 . Two ends of the reinforcing portion  2143  along the vibrating direction extend beyond the fixing portion  214 . 
     Upper and lower end surfaces of the reinforcing portion  2143  along the vibrating direction are lower than upper and lower end surfaces of the frame  1 . The height of a steel ring is used to store excess rubber extruded during a rubber molding process. The rubber meets the bonding force of the steel ring and does not need to exceed the inner surface of the steel ring, thereby saving space. 
     Four reinforcing portions  2143  are provided, and the four reinforcing portions  2143  are located at four corners of the inner peripheral side of the frame  1 . 
     The speaker further includes a front cover  4  covering sides of the reinforcing portions  2143  away from the magnetic circuit unit  3  and fixed to an inner side of the frame  1 . The front cover  4  is spaced apart from the diaphragm  21  to form a front chamber  5 . The front cover  4  is provided with sound holes  41 . The sound holes  41  communicate the front chamber  5  with the exterior. Multiple sound holes  41  are provided, and the multiple sound holes  41  are evenly distributed in the front cover  4 . 
     The frame  1  includes a first frame  12  and a second frame  11  stacked to and fixed to the first frame  12  along the vibrating direction. The vibration unit  2  is fixed to the second frame  11 , and the magnetic circuit unit  3  is fixed to the first frame  12 . 
     The frame  1  is made of a metal material. The frame  1  has a steel ring structure with high strength and desirable fixing effect. 
     The vibration unit  2  further includes a dome  215 , and the dome  215  covers an inner periphery of the second suspension  213 . 
     In this embodiment, the vibration unit  2  further includes a holder  23  fixed to the diaphragm  21 . One end of the holder  23  extends into the magnetic gap  35  to be fixed to and connected to the voice coil  24 . The holder  23  includes a ring-shaped holder body  231  and a holder fixing portion  232  bending and extending from an inner peripheral side of the holder body  231  toward the voice coil  24 . The holder body  231  is located between the first suspension  211  and the second suspension  213 , and is connected to an inner periphery of the first suspension  211  and an outer periphery of the second suspension  213  to serve as the vibrating portion  212 . 
     The holder  23  further includes second fixing portions  233  extending from an outer periphery of the holder body  231  in a direction away from the diaphragm  21 . The vibration unit  2  further includes elastic support assemblies  22 . The elastic support assemblies  22  are fixed to an end of the frame  1  away from the diaphragm  21 . The second fixing portions  233  are connected to the frame  1 . 
     Two elastic support assemblies  22  are provided and located at two opposite sides of the voice coil  24 . 
     The elastic support assemblies  22  each include a conductive elastic member  221 , a steel ring  222  fixed to the elastic member  221  and an auxiliary diaphragm  223  fixed to the steel ring  222 . The elastic member  221  includes a first elastic arm  2211  attached to a side of the steel ring  222  close to the diaphragm  21 , a second elastic arm  2212  fixed to the holder  23  and spaced apart from the first elastic arm  2211 , and an elastic connecting arm connecting the first elastic arm  2211  and the second elastic arm  2212 . The second elastic arm  2212  is electrically connected to the voice coil  24 . 
     The magnetic circuit unit  3  includes a yoke  31  fixed in the frame  1 , a first main magnet  32  stacked to a side of the yoke  31  close to the diaphragm  21 , a first pole plate  33  stacked to a side of the first main magnet  32  close to the diaphragm  21 , a second main magnet  37  stacked to a side of the first pole plate  33  close to the diaphragm  21 , at least two auxiliary magnets  38  stacked to a side of the yoke  31  close to the diaphragm  21  and spaced apart from the first main magnet  32  to form the magnetic gap  35 , and a second pole plate  34  stacked to a side of each of the auxiliary magnets  38  close to the diaphragm  21 . 
     The magnetic circuit unit  3  further includes a ring-shaped bracket  36 . An outer periphery of the bracket  36  is fixed to the frame  1 , and an inner periphery of the bracket  36  is fixed to upper surfaces of the auxiliary magnets  38 . 
     Compared with the related art, the speaker in the present disclosure includes a frame, a vibration unit fixed to the frame and a magnetic circuit unit driving the vibration unit to vibrate and provided with a magnetic gap; the vibration unit includes a diaphragm fixed to the frame and a voice coil inserted in the magnetic gap to drive the diaphragm to vibrate and produce sound; an outer periphery of the diaphragm bends and extends to form fixing portions, the fixing portions extend along a vibrating direction of the diaphragm and are attached to an inner peripheral side of the frame. With this structure, the bonding strength of the frame and the diaphragm is improved; in addition, the diaphragm does not occupy an outer space of the frame, and an appearance size of the speaker is effectively controlled, thereby facilitating the miniaturization design. 
     The above described are merely implementations of the present disclosure. It should be noted here that those of ordinary skill in the art may make improvements without departing from the concept of the present disclosure, but such improvements should fall within the protection scope of the present disclosure.