Abstract:
A loudspeaker includes a base, a sound-reflecting member located at a side of the base, a sound generator mounted to the sound-reflecting member, an adjusting member including a number of magnetic pieces and located at an opposite side of the base, a connecting member connected between the sound-reflecting member and the adjusting member, a supporting member, and a controlling apparatus. The supporting member includes a number of first electromagnets mounted to the magnetic pieces. The controlling apparatus is electrically coupled to the first electromagnets. The controlling apparatus controls the first electromagnets to attract the magnetic pieces, to allow the adjusting member to swing, and the adjusting member drives the connecting member to rotate, thereby swinging the sound-reflecting member.

Description:
BACKGROUND 
     1. Technical Field 
     The present disclosure generally relates to a loudspeaker. 
     2. Description of Related Art 
     Sound broadcasted by loudspeakers travels in all directions. However, the sound may not be heard equally clearly by people at different locations, and a conventional loudspeaker can not adjust itself towards a listener at a different locations. Therefore, there is room for improvement in the art. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       Many aspects of the present embodiments can be better understood with reference to the following drawings. The components in the drawings are not necessarily drawn to scale, the emphasis instead being placed upon clearly illustrating the principles of the present embodiments. Moreover, in the drawings, all the views are schematic, and like reference numerals designate corresponding parts throughout the several views. 
         FIG. 1  is an exploded, isometric view of an embodiment of a loudspeaker. 
         FIG. 2  is similar to  FIG. 1 , but viewed from another perspective. 
         FIG. 3  is an assembled, isometric view of the loudspeaker of  FIG. 1 . 
         FIG. 4  is an assembled, isometric view of the loudspeaker of  FIG. 2 . 
         FIG. 5  is a side plan view of  FIG. 3 . 
         FIG. 6  is similar to  FIG. 5 , but shows the loudspeaker in a state of use. 
     
    
    
     DETAILED DESCRIPTION 
     The disclosure, including the accompanying drawings, is illustrated by way of examples and not by way of limitation. It should be noted that references to “an” or “one” embodiment in this disclosure are not necessarily to the same embodiment, and such references mean “at least one.” 
       FIGS. 1 and 2  show an embodiment of a loudspeaker  100  including a sound generator  10 , a sound-reflecting member  20 , a base  30 , a controlling apparatus  40 , an adjusting member  50 , a supporting member  60 , a positioning apparatus  70 , a connecting member  80 , and a ring  90 . 
     The sound generator  10  includes a mounting bracket  12  and an electromagnetic actuator  15 . The mounting bracket  12  includes a bowl  121  and a plurality of connecting hooks  123  slantingly extending out from a circumference of the bowl  121 . An inner surface of the bowl  121  defines a latching hole  125  for receiving the electromagnetic actuator  15 . The electromagnetic actuator  15  is configured for generating sound. 
     The sound-reflecting member  20  is substantially dish-shaped and made of acoustic resistant material. An inner surface of the sound-reflecting member  20  is a sound-reflecting surface  21 . An area of the sound-reflecting surface  21  is greater than an area of an outer surface of the electromagnetic actuator  15  opposite to the reflecting surface  21 . A through hole  23  is axially defined in the sound-reflecting member  20 . 
     The base  30  is substantially cross-shaped and includes two positioning arms  32  connected substantially perpendicularly to each other. A junction of the positioning arms  32  defines a receiving hole  33 . 
     The controlling apparatus  40  includes a monitoring apparatus  42  and a controller  45 . The monitoring apparatus  42  and the controller  45  are mounted on two opposite ends of one of the positioning arms  32 , respectively. The monitoring apparatus  42  and the sound-reflecting member  20  face a same direction. The monitoring apparatus  42  is configured for capturing images in front of the sound-reflecting member  20 . The controller  45  is electrically coupled to the monitoring apparatus  42 . 
     The adjusting member  50  includes a substantially hemispherical adjusting piece  52  and a plurality of magnetic pieces  53  extending from a circumference of the adjusting piece  52 . In one embodiment, each magnetic piece  53  is made of iron, and each magnetic piece  53  extends slantingly from the circumference of the adjusting piece  52  toward a center of the adjusting piece  52 . The center of the adjusting piece  52  axially defines a mounting hole  522 . 
     The supporting member  60  includes a shell  62 , four supporting arms  63  extending slantingly out from four sides of the shell  62 , and four first electromagnets  65 . The shell  62  includes a substantially cross-shaped back plate  621  and a substantially cross-shaped middle plate  625  opposite to and spaced from the back plate  621 . Angles defined between the supporting poles  63  and the middle plate  625  are obtuse angles and are substantially the same. The back plate  621  and the middle plate  625  cooperatively bound a receiving space  626 . A middle of the middle plate  625  defines a guiding hole  627  communicating with the receiving space  626 . An installing portion  628  protrudes into the receiving space  626  from the back plate  621 . Each supporting pole  63  includes a connecting portion  632  at a distal end thereof and a tab  635 . The tab  635  is adjacent to the connecting portion  632  and extends toward a tab  635  of an opposite supporting arm  63 . The first electromagnets  65  are mounted to the tabs  635  to face the shell  62 . The supporting poles  63  cooperatively bound an adjustment space  637 . 
     The positioning apparatus  70  includes a second electromagnet  72 , a resilient member  74 , and a positioning member  76 . The positioning member  76  includes a connecting block  762 , a positioning portion  763  opposite to the connecting block  762 , and a guiding pin  765  detachably connected between the connecting block  762  and the positioning portion  763 . In one embodiment, the positioning portion  763  is made of pliable material, such as pliable plastic, the resilient member  74  is a spring, and the connecting block  762  is made of iron. The controller  45  is electrically coupled to the first electromagnets  65  and the second electromagnet  72 . 
     The connecting member  80  includes a spherical rotating portion  82 , a connecting pole  83  protruding out from a first side of the rotating portion  82 , and a mounting portion  85  protruding out from a second side of the rotating portion  82  opposite from the first side. A middle part of the mounting portion  85  defines an installing hole  852  extending along an axial direction of the connecting pole  83 . 
       FIGS. 3 and 4  show that in assembly of the loudspeaker  100 , the second electromagnet  72  is received in the receiving space  626  and mounted to the installing portion  628  of the back plate  621 . The connecting block  762  is detached from the guiding pin  765  and received in the receiving space  626 . The resilient member  74  is sleeved around the guiding pin  765 . The guiding pin  765  is partially received in the guiding hole  627  from the adjustment space  637 , such that the positioning portion  763  remains outside the guiding hole  627 . The part of the guiding pin  765  received in the guiding hole  627  is mounted to the connecting block  762 . The resilient member  74  is resiliently sandwiched between the positioning portion  763  and the middle plate  625  to bias the connecting block  762  away from the second electromagnet  72 . The ring  90  is securely received in the receiving hole  33  of the base  30 . The connecting pole  83  of the connecting member  80  is received through an interior space of the ring  90 , until the rotating portion  82  is rotatably received in the ring  90 , and the mounting portion  85  is located at a same side of the positioning arms  32  as the monitoring apparatus  42 . The connecting pole  83  is latched in the mounting hole  522  of the adjusting member  50 , and the magnetic pieces  53  face the base  30 . An outer surface of the sound-reflecting member  20  opposite from the sound-reflecting surface  21  is attached to the mounting portion  85 , such that the through hole  23  is aligned with the installing hole  852 . A screw is received through the through hole  23  and is screwed in the installing hole  852  to secure the sound-reflecting member  20  to the mounting portion  85  of the connecting member  80 . The connecting portions  632  of the supporting member  60  are mounted to the positioning arms  32  of the base  30 , such that the adjusting member  50  is received in the adjustment space  637  of the supporting member  60 . Thus, the first electromagnets  65  align with the magnetic pieces  53  of the adjusting member  50 , the positioning portion  763  engages with the adjusting member  50  to position the sound-reflecting member  20 , and the connecting block  762  is spaced from the second electromagnet  72 . The electromagnetic actuator  15  is received in the latching hole  125  of the mounting bracket  12 , such that the electromagnetic actuator  15  faces the sound-reflecting surface  21 . The connecting hooks  123  are latched around a circumference of the sound-reflecting member  20  sound-reflecting. 
       FIGS. 5 and 6  show that in use, the sound generator  10  generates sound for a user  300 . The monitoring apparatus  42  captures images of the user  300  and transmits the images to the controller  45 . The controller  45  recognizes a human face from the images. The controller  45  controls the second electromagnet  72  to switch on a power supply. When the second electromagnet  72  is turned on, the connecting block  762  is attracted to the second electromagnet  72 , causing the guiding pin  765  to slide along the guiding hole  627  of the middle plate  625  and deform the resilient member  74 . As a result, the positioning portion  763  is detached from the adjusting member  50 . Then, the controller  45  controls one or more of the first electromagnets  65  to switch on or off a power supply, causing one or more corresponding magnetic pieces  53  to be attracted to the first electromagnets  65 , which further causes the adjusting member  50  to swing. The connecting member  80  is rotated by the adjusting member  50 , and the sound-reflecting member  20  is swung by the connecting member  80 , such that the sound-reflecting member  20  points to the user  300 . Therefore, an angle of the sound-reflecting member  20  and the base  30  is adjusted, and sound generated by the sound generator  10  is broadcasted toward the user  300 . The controller  45  controls the second electromagnet  72  to switch off the power supply, causing the resilient member  74  to restore to drive the positioning member  76  to move back toward the adjusting member  50 . The connecting block  762  is detached from the second electromagnet  72 , and the positioning portion  763  engages with the adjusting member  50  to securely hold the sound-reflecting member  20  in position. 
     It is to be understood, that even though numerous characteristics and advantages of the embodiment have been set forth in the foregoing description, together with details of the structure and function of the embodiment, the disclosure is illustrative only, and changes may be made in detail, especially in the matters of shape, size, and arrangement of parts within the principles of the present disclosure to the full extent indicated by the broad general meaning of the terms in which the appended claims are expressed.