Patent Publication Number: US-9838798-B2

Title: Long stroke speaker

Description:
FIELD OF THE DISCLOSURE 
     The present invention relates to a speaker, and in particular, relates to a long stroke speaker. 
     BACKGROUND 
     In recent years, with the development of science and technology, especially the remarkable development of mobile communication technology, more and more mobile electronic devices appear in people&#39;s daily life, such as smart phone, tablet computer, notebook computer and multifunction media player and have already become indispensable personal belongings in people&#39;s life. In these mobile electronic devices, voice playing devices are essential components therein. The voice quality can directly affect users&#39; experience when they use these mobile electronic devices. 
     As a voice playing device, the structure and design of the long stroke speaker can directly affect the voice playing quality. The long stroke speaker in prior art only has unidirectional sound emission, and must have a cavity with certain volume in order to meet the performance requirement. 
     In application, when the long stroke speaker needs to emit sound in other direction, it must be provided with a conventional speaker and needs a rear cavity with certain volume, which occupies considerable space and also increases cost. 
     Therefore, it is desired to provide a new long stroke speaker which can overcome the aforesaid problems. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       Many aspects of the embodiment can be better understood with reference to the following drawings. The components in the drawing are not necessarily drawn to scale, the emphasis instead being placed upon clearly illustrating the principles of the present disclosure. Moreover, in the drawings, like reference numerals designate corresponding parts throughout the several views. 
         FIG. 1  is an exploded view showing a long stroke speaker according to an embodiment of the present invention; 
         FIG. 2  is a perspective view of the long stroke speaker shown in  FIG. 1 ; 
         FIG. 3  is a sectional view of the long stroke speaker shown in  FIG. 2  taken along A-A; 
         FIG. 4  is a sectional view of a long stroke speaker according to another embodiment of the present invention; 
         FIG. 5  is a sectional view of a long stroke speaker according to yet another embodiment of the present invention. 
     
    
    
     DETAILED DESCRIPTION 
     The present disclosure will be described in detail below with reference to the attached drawings and the embodiment thereof. 
     Referring to  FIGS. 1-3 , a long stroke speaker  1  comprises a shell  11  having a receiving space  110 ; a first vibration system  12  and a second vibration system  13  connected with the shell  11  respectively; a magnetic circuit system  14  and a sound output ring  19 . The receiving space  110  comprises a first acoustic cavity  114  and a second acoustic cavity  115  communicated with each other. The vibration direction of the first vibration system  12  intersects with the vibration direction of the second vibration system  13 . For ease of description, the vibration direction of the first vibration system  12  is called X direction; and the vibration direction of the second vibration system  13  is called Y direction. 
     The shell  11  comprises a first side wall  111 , a second side wall  112  opposite to the first side wall  111 , and several third side walls  113  connected with the first side wall  111  and the second side wall  112 . The first side wall  111 , the second side wall  112  and the third side walls  113  enclose a receiving space  110  together. The third side walls  113  is provided with a first receiving portion  121  for receiving the first vibration system  12 . The first side wall  111  or the second side wall  112  is provided with a second receiving portion  131  for receiving the second vibration system  13 . In this embodiment, the third side walls  113  are connected with and perpendiculars to the first side wall  111  and the second side wall  112 , and the X direction and the Y direction intersect to each other perpendicularly. 
     The first vibration system  12  comprises a first diaphragm  122 , a coil  123  and a support  124  for supporting the first diaphragm  122  and the coil  123 . The support  124  comprises a first support portion  1241  received in the first receiving portion  121  and connected with the third side wall  113 ; a second support portion  1242  extending from the first support portion  1241  along the X direction; and a barrier portion  1243  connected with the second support portion  1242 . The first diaphragm  122  is connected with the first support portion  1241 . The coil  123  is disposed on the second support portion  1242 . The two ends of the barrier portion  1243  are connected with the first side wall  111  and the second side wall  112  respectively so as to divide the receiving space  110  into a first acoustic cavity  114  and a second acoustic cavity  115  communicated with each other. 
     The second vibration system  13  comprises a second diaphragm  132  disposed in the second receiving portion  131  and a hollow cover plate  133 . The second diaphragm  132  is located under the hollow cover plate  133 . 
     Furthermore, each of the first diaphragm  122  and the second diaphragm  132  comprises a corrugation portion and a flat portion. The corrugation portion is around the flat portion. The corrugation portion can support larger amplitude. The first vibration system  12  also comprises a first dome  161  attached on the first diaphragm  122 . The second vibration system  13  also comprises a second dome  162  attached on the second diaphragm  132 . 
     In this embodiment, there is one magnetic circuit system  14 , which is disposed in the first acoustic cavity  114 . Specifically, the magnetic circuit system  14  comprises a pair of magnetic steel assemblies  141  spaced apart and connected with the first side wall  111  and the second side wall  112  respectively. The coil  123  of the first vibration system  12  and the second support portion  1242  are interposed between the magnetic steel assemblies  141 . Each of the magnetic steel assemblies  141  comprises a magnetic steel block  1412  and a pole plate  1411  stacked on the magnetic steel block  1412 . The first side wall  111  and the second side wall  112  are provided with through holes  1413  for receiving the pole plate  1411 . 
     The magnetic steel blocks  1412  of the magnetic steel assemblies  141  disposed at two sides of the coil  123  are a first magnet portion  1414  and a second magnet portion  1415 , wherein each of the first magnet portion  1414  and the second magnet portion  1415  comprises two main magnetic steel blocks and an auxiliary magnetic steel block interposed between the two main magnetic steel blocks. Specifically, the first magnet portion  1414  comprises two first main magnetic steel blocks  14141  and a first auxiliary magnetic steel block  14142 , wherein the first auxiliary magnetic steel block  14142  is interposed between the two first main magnetic steel blocks  14141 . The second magnet portion  1415  comprises two second main magnetic steel blocks  14151  and a second auxiliary magnetic steel block  14152 , wherein the second auxiliary magnetic steel block  14152  is interposed between two second main magnetic steel blocks  14151 . 
     The sound output ring  19  is disposed around the first diaphragm  122  and forms a sound output cavity for the first diaphragm  122  so that the long stroke speaker  1  can have better sound output effects. 
     Referring to  FIG. 4 , it is a sectional view of a long stroke speaker according to another embodiment of the present invention. In the present embodiment, there is one magnetic circuit system  24 , which is disposed in the second acoustic cavity  215 . A second receiving portion  231  is provided on the first side wall  211 . 
     The magnetic circuit system  24  comprises a magnetic steel block  241  fixed on the second side wall  212  and a pole core  242  attached on the magnetic steel block  241 . 
     The second vibration system  25  comprises a second diaphragm  251  received in the second receiving portion  231  and a voice coil  252  connected with the second diaphragm  251 . The voice coil  252  is located under the second diaphragm  251  and is disposed around the magnetic steel block  241 . 
     At least a portion of the second side wall  212  is made of permeability material. The magnetic steel block  241  is connected with that portion of the second side wall  212  made of permeability material. 
     Referring to  FIG. 5 , it is a sectional view of a long stroke speaker according to yet another embodiment of the present invention. In this embodiment, there are two magnetic circuit systems  34 , a first magnetic circuit system  341  disposed in the first acoustic cavity  314  and a second magnetic circuit system  342  disposed in the second acoustic cavity  315 , respectively. 
     The first magnetic circuit system  341  comprises a pair of magnetic steel assemblies  3411  connected with the first side wall  311  and the second side wall  312  respectively. The second magnetic circuit system  342  comprises a magnetic steel block  3421  disposes on the second side wall  312  and a pole core  3422  connected with the magnetic steel block  3421 . The first vibration system  32  comprises a first diaphragm  321 , a coil  322  disposed between the pair of magnetic steel assemblies  3411  and a support  323  for supporting the first diaphragm  321  and the coil  322 . The coil  322  is interposed between the magnetic steel assemblies  3411 . The second vibration system  33  comprises a second diaphragm  331  received in the second receiving system  33  and a voice coil  332  connected with the second diaphragm  331 . The voice coil  332  is disposed around the magnetic steel block  3421 . 
     When the long stroke speaker according to the present invention emits sound through the vibration of the first vibration system in the first acoustic cavity, because of the change of the air volume in the second vibration system in the second acoustic cavity, the second vibration system can be driven to vibrate, realizing the sound emission of the second acoustic cavity. That is to say, one magnetic circuit system can realize bidirectional sound emission of the first acoustic cavity and the second acoustic cavity simultaneously without adding a conventional speaker, which can greatly save space and reduce cost. 
     It is to be understood, however, that even though numerous characteristics and advantages of the present embodiment have been set forth in the foregoing description, together with details of the structures and functions of the embodiment, the disclosure is illustrative only, and changes may be made in detail, especially in matters of shape, size, and arrangement of parts within the principles of the invention to the full extent indicated by the broad general meaning of the terms in which the appended claims are expressed.