Patent Publication Number: US-10764663-B2

Title: Speaker box

Description:
FIELD OF THE DISCLOSURE 
     The present disclosure relates to electro-acoustic transducers, and more particularly to a speaker box used in a portable electronic device. 
     DESCRIPTION OF RELATED ART 
     With the advent of the mobile Internet era, a drastically increasing number of smart mobile devices are being used. In all these mobile devices, mobile phones are most common and most portable mobile terminal devices. At present, mobile phones are powerfully in functionality. One of the powerful functions is the high-quality music function. Therefore, speaker boxes for playing music are widely applied to the conventional smart mobile devices. 
     A speaker box of the related art comprises a shell having a receiving space, a speaker accommodated in the shell and a acoustic guiding channel formed in the receiving space. The speaker comprises a diaphragm for vibrating and produce sound and via irradiation. The diaphragm partitions the receiving space into a front acoustic cavity and a rear cavity. The acoustic guiding channel communicates the front acoustic cavity with the outside, and cooperatively defines a front cavity with the front acoustic cavity. 
     However, in the speaker box in the related art, the anterior cavity has a space which is limited to a region rightly opposite to a dome and a region of the sound guide channel, and the structure is monotonous and may not be optimized. Therefore, high-frequency acoustic performance of the speaker box is subject to restrictions, and over-high high-frequency responses may cause harsh sounds, sharp dentilabial sounds and the like poor sound effects. 
     Therefore, it is desired to provide a speaker box to overcome the aforesaid problems. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       Many aspects of the exemplary embodiments 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 a three-dimensional diagram of structure of the speaker box in accordance with an exemplary embodiment of the present disclosure. 
         FIG. 2  is a partial three-dimensional perspective diagram of the structure of the speaker box exploded view; and 
         FIG. 3  is a cross-sectional diagram along the A-A line showing in  FIG. 1 . 
     
    
    
     DETAILED DESCRIPTION 
     The present disclosure will hereinafter be described in detail with reference to several exemplary embodiments. To make the technical problems solved, technical solutions and beneficial effects of the present disclosure more apparent, the present disclosure is described in further detail together with the figure and the embodiments. It should be understood the specific embodiments described hereby is only to explain the disclosure, not intended to limit the disclosure. 
     Please refer to  FIG. 1  to  FIG. 3  together, wherein  FIG. 1  is a three-dimensional structure diagram of the speaker box of the present disclosure,  FIG. 2  is a partial three-dimensional perspective diagram of the speaker box exploded view, and  FIG. 3  is a cross-sectional diagram along the A-A line showing in  FIG. 1 . The present disclosure provides a speaker box  100 , which comprises a shell  1  having receiving space  10 , a speaker  2 , an acoustic guiding channel  3 , an auxiliary acoustic cavity  4 , a baffle  5  and a cover plate  6 . 
     The shell  1  may be either formed integrally or be formed separately. For example, in this embodiment, the shell  1  comprises a lower cover  11  and an upper cover  12  covering with the lower cover  11  and cooperatively forming the receiving space  10  with the lower cover  11 . 
     The speaker  2  is accommodated in the receiving space  10  of the Shell  1 , and the speaker  2  partitions the receiving space  10  into a front acoustic cavity  7  and a rear cavity  101 . 
     In this embodiment, the speaker  2  comprises a diaphragm  21  for producing sound via vibrating, wherein the diaphragm  21  partitions the receiving space  10  into the front acoustic cavity  7  and a rear cavity  101 . In particular, the diaphragm  21  and the upper cover  12  are spaced apart from each other, and cooperatively form the front acoustic cavity  7 , and the diaphragm  21 , the upper cover  12  and the lower cover  11  cooperatively forms the rear cavity  101 . The rear cavity  101  is designed to improve the low-frequency acoustic performance of the speaker box  100 . 
     The acoustic guiding channel  3  is defined in the receiving space  10  of the shell  1 . In this embodiment, the acoustic guiding channel  3  is disposed in the upper cover  12 . The acoustic guiding channel  3  communicates the front acoustic cavity  7  with the outside and cooperatively defines a front cavity  102  with the front acoustic cavity  7 . The acoustic guiding channel  3  is used to form a side sound radiating structure of the front cavity  102 . 
     The auxiliary acoustic cavity  4  is formed in the receiving space  10 , for example, formed in the upper cover  12 . The auxiliary acoustic cavity  4  comprises a first through-hole  41  and a second through-hole  42 , wherein the first through-hole  41  communicates with the front cavity  102  and the second through-hole  42  communicates with the outside. 
     The baffle  5  is provided with a channel  51  penetrating therethrough, and the auxiliary acoustic cavity  4  is in communication with the front cavity  102  through the channel  51 . In this embodiment, the baffle  5  fully covers the first through-hole  41  and is fixed thereat. The baffle  5  partitions the front cavity  102  and the auxiliary acoustic cavity  4  into two cavities, and enables the auxiliary acoustic cavity  4  to be in communication with the front cavity  102  through the channel  51 . That is, the auxiliary acoustic cavity  4  serves as a portion of the front cavity  102  and is used as a resonator of the front cavity  102 . 
     In one aspect, the structure effectively increases a cavity volume of the front cavity  102  and improves the high-frequency acoustic performance, and in another aspect, the auxiliary acoustic cavity  4  has a more flexible structure design, is subject to less restriction and has more applicability. 
     In particular, the auxiliary acoustic cavity  4  is in communication with the front vocal cavity  7  through the channel  51 . Nevertheless, the auxiliary acoustic cavity  4  may also be in communication with the acoustic guiding channel  3  through the channel  51 , which is also practicable based on the same principle. 
     In the present embodiment, the channel  51  has at least one of a rectangle shape, a triangle shape, and a circle shape and the like. Of course, the shape of thereof is not limited thereto. The number of channel  51  is also unlimited, can be one or more, in this embodiment, the number of the channel  51  is two and the two channels  51  are spaced apart from each other. 
     With the structure design, the structure can be adjusted by adjusting the size of the channel  51  of the baffle  5  to achieve the damping size adjustment, so as to realize the high-frequency acoustic performance regulation of the speaker box  100 , and enhance the diversification and flexibility of performance regulation thereof. 
     The cover plate  6  completely covers the second through-hole  42  and is fixed thereat. Thus, the auxiliary acoustic cavity  4  defines a sealed cavity structure to act as a resonator of the front cavity  102 , and to realize the high-frequency acoustic performance adjustment of the front cavity  102 . In the present embodiment, the cover plate  6  is made of a PET material and is certainly not limited to this material. 
     The structure design of the auxiliary acoustic cavity  4  can effectively reduce a Q value (quality factor value) and sensitivity of a high-frequency resonance peak of the speaker box  100 , which makes the acoustic performance of the speaker box  100  more excellent. 
     Compared with the relevant art, the speaker box of the present disclosure provides the auxiliary acoustic cavity  4  in communication with the front cavity  102  in the shell  1 , so that the auxiliary acoustic cavity  4  serves as a portion of the front cavity  102  and acts as a resonant cavity, in one aspect, it effectively increases the cavity volume of the front cavity, and improves the high-frequency acoustic performance, in another aspect, the auxiliary acoustic cavity structure design is more flexible and diverse, and the applicability is higher, and the above structure can effectively reduce the Q value (quality factor value) and sensitivity of the high-frequency resonance peak of the speaker box, which makes the acoustic performance of the speaker box more excellent. 
     It is to be understood, however, that even though numerous characteristics and advantages of the present embodiments have been set forth in the foregoing description, together with details of the structures and functions of the embodiments, 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.