Patent Publication Number: US-2015078605-A1

Title: Speaker structure

Description:
FIELD OF THE INVENTION 
     The present invention relates to an improved speaker structure, and particularly to an improved speaker structure enabling extension of the sound wave towards low frequency range and enhancing low frequency sound effect. 
     BACKGROUND OF THE INVENTION 
     An example of a conventional speaker structure has an opening in front of the shell and a magnetic circuit at the back. A sound coil is positioned at the center of the magnetic circuit. A resonance film is adhered between the opening of the shell and the sound coil. When the conventional speaker is used for a long time, the heat generated will deteriorate the adhesive. Although the conventional speaker generates sound with quality, the assembly size of the conventional speaker is large. If the speaker is used in a corresponding video displaying product, the size of the speaker must be reduced. However, based on the design of the conventional speaker structure, there is a minimum height limitation for the speaker to provide effective resonance. 
     Taiwan Utility Model Patent No. M401942 discloses a speaker structure, which provides a bottom cylinder having flow guiding pieces. The flow guiding pieces are positioned at the surface of the bottom cylinder such that air flows in the video displaying product or in the speaker may flow through the air flow channels formed by the flow guiding pieces to enhance low frequency sound effect. However, the effect generated in this patent is not significant. 
     Based on the deficiencies of the related art, the invention provides a speaker structure, which forms the resonance film and the speaker body integrally by injection molding to solve the problem of deterioration of the adhesive due to heat generated. According to the invention, the speaker structure forms a sealed sound chamber by combining the speaker body, the resonance body and the at least one sound guiding portion. Thus, the speaker body generates a front sound wave and a guiding sound wave, structure enabling extension of the sound wave towards low frequency range and enhancing low frequency sound effect 
     SUMMARY OF THE INVENTION 
     Based on the problems as disclosed above, an objective of the present invention is to provide an improved speaker structure to solve the deficiencies of the related arts. 
     An aspect of the present invention provides an improved speaker structure, including a speaker body, a resonance body and at least one sound guiding portion. The speaker body includes a base, a drum paper, a yoke, a magnetic unit, a sound coil and a supporting column. The resonance body includes a resonance film and a resonance film frame, wherein one side of the resonance film is connected to the base to be surroundingly positioned around the speaker body, and the other side of the resonance film is positioned on the resonance film frame. The sound guiding portion includes a first sound guiding member, a second sound guiding member and a back frame unit, wherein the first sound guiding member has a hollow first extruding structure extruding inwards and is correspondingly positioned on the second sound guiding member, and the second sound guiding member has a hollow second extruding structure extruding outwards and correspondingly supports the first sound guiding member, wherein the first extruding structure and the second extruding structure do not contact each other, wherein the first sound guiding member and the second sound guiding member form a resonance cavity, wherein a bottom portion of the second sound guiding member is provided with an opening, and a top portion of the second sound guiding member has two sides surroundingly connected to the resonance film frame, wherein the back frame unit is connected to the opening. 
     A major objective of the present invention is to provide an improved speaker structure, where the speaker structure forms a sealed sound chamber by combining the speaker body, the resonance body and the at least one sound guiding portion. When the speaker body generates a front sound wave and a guiding sound wave, the front sound wave is transmitted within the sound chamber to the resonance film and drives the resonance film to generate a corresponding sound, and the guiding sound wave is transmitted within the resonance cavity and forms a back sound wave, passing through the opening and driving the back frame unit to vibrate and to generate a corresponding sound, thus generating better sound effect. 
     A further objective of the present invention is to provide an improved speaker structure which extends the guiding distance of the front and back sound waves, thus enabling extension of the sound wave towards low frequency range. 
     A further objective of the present invention is to provide an improved speaker structure, where the front and back sound waves are compressed to increase the driving forces to the resonance film and the back frame unit, thus obtaining better low frequency sound effect. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG. 1  is a schematic view of an improved speaker structure according to one embodiment of the present invention. 
         FIG. 2  is a top view of a sound guiding portion of an improved speaker structure according to one embodiment of the present invention. 
         FIG. 3  is another schematic view of an improved speaker structure according to one embodiment of the present invention. 
         FIG. 4  is a further schematic view of an improved speaker structure according to one embodiment of the present invention. 
     
    
    
     DESCRIPTION OF EMBODIMENTS OF THE INVENTION 
     To understand the objectives, features and effects of the present invention, the following detailed description of the embodiment of the present invention is provided along with the accompanied drawings to further describe the present invention in greater detail as follows. 
     Referring now to  FIG. 1 , which shows a schematic view of an improved speaker structure according to one embodiment of the present invention. The improved speaker structure  1  includes a speaker body  10 , a resonance body  20  and at least one sound guiding portion  30 . The speaker structure  1  forms a sealed sound chamber  40  by combining the speaker body  10 , the resonance body  20  and the at least one sound guiding portion  30 . 
     The speaker body  10  includes a base  110 , a drum paper  120 , a yoke  130 , a magnetic unit  140 , a sound coil  150  and a supporting column  160 . The base  110  of the speaker body  10  has an upper combining portion  112  and a lower combining portion  114 ; the drum paper  120  is positioned at the upper combining portion  112  and has a middle portion  122 , and a center of the middle portion  122  is positioned with a through hole  124 ; the yoke  130  is positioned at the lower combining portion  114 ; the magnetic unit  140  has a magnet  142  and a front piece  146  which is magnetic permeable, and the magnetic unit  140  is positioned on the yoke  130 ; the sound coil  150  is surroundingly positioned at a bottom surface of the drum paper  120 , and includes an electrical conductive coil  152 ; and the supporting column  160  has a first side surface  162  and a second side surface  166 , where the first side surface  162  is positioned above the front piece  146  and has a concave  164  to support and to fix the middle portion  122  of the drum paper  120 , and the second side surface  166  combines with the front piece  146 . The supporting column  160  maintains the stability of the sound coil  150  in perpendicular movements, thus preventing the sound coil  150  from colliding with the yoke  130  and the magnetic unit  140 . It should be appreciated that an inner ring surface  132  of the yoke  130  has a first magnetic interacting surface  134  and a second magnetic interacting surface  136 . The first magnetic interacting surface  134  extends toward the front piece  146  relative to the inner ring surface  132  of the yoke  130  at a perpendicular side, and a magnetic gap  149  is formed between the first magnetic interacting surface  134  and a front piece end surface  148  of the front piece  146  for to positioning the sound coil  150 . Thus, by providing electric power, the sound coil  150  generates a magnetic field, and performs perpendicular movements within the magnetic gap  149 , thereby moving the drum paper  120 . Due to the movement of the sound coil  150 , the drum paper  120  vibrates the air and generates sound. The second magnetic interacting surface  136  extends horizontally toward two sides along a bottom of the yoke  130  to form a slot  138 . The front piece end surface  148  of the front piece  146  extends outward relative to a magnet end surface  144  of the magnet  142 . 
     It should be appreciated that the first magnetic interacting surface  134  and the front piece  146  forces the magnetic lines generated by the sound coil  150  to integrate, thus enhancing the magnetic force (Webber) within the magnetic gap  149 . On the other hand, the second magnetic interacting surface  136  effectively reduces the magnetic flux (Gauss) loss during the perpendicular movements of the sound coil  150 , thus preventing magnetic loss. 
     Further, the speaker body  10  includes a fixing column  170  and a dust cover (not shown in the figure). The fixing column  170  has a lower side surface  172 . The lower side surface  172  of the fixing column  170  passes through the through hole  124  of the drum paper  120  to be fixed in the concave  164  of the supporting column  160 . The dust cover is configured to be sleeve-connected to the fixing column  170  to prevent dust from entering the speaker body  10 . 
     The resonance body  20  includes a resonance film  210  and a resonance film frame  220 . One side of the resonance film  210  is connected to the base  110  to be surroundingly positioned around the speaker body  10 , and the other side of the resonance film  210  is positioned on the resonance film frame  220 . It should be appreciated that the resonance film  210  may be formed to have one of a continued curved structure, a wave structure and an uneven structure, and may be formed integrally with the speaker body  10 . When the speaker body  10  generates a front sound wave  50 , the front sound wave  50  is transmitted within the sound chamber  40  to the resonance film  210  to extend the guiding distance of the front sound wave  50 , thus enabling extension of the front sound wave  50  towards low frequency range. Further, the front sound wave  50  is compressed to increase the driving force to the resonance film  210 , thus enhancing low frequency sound effect. However, in another example in practice, the speaker body  10  can be replaced by choosing from one of the different types among full-range speaker body, high-pitched speaker body, and low-pitched speaker body and so on, before it is fixed on the resonance film  210  by adhesive, to achieve the performance of different sound waves and ranges. 
     The sound guiding portion  30  includes a first sound guiding member  310 , a second sound guiding member  320  and a back frame unit  330 . The first sound guiding member  310  has a hollow first extruding structure  312  extruding inwards and is correspondingly positioned on the second sound guiding member  320 , and the second sound guiding member  320  has a hollow second extruding structure  322  extruding outwards and correspondingly supports the first sound guiding member  310 , and the first extruding structure  312  and the second extruding structure  322  do not contact each other. The first sound guiding member  310  and the second sound guiding member  320  form a resonance cavity  340  having a speaker shape. A bottom portion of the second sound guiding member  320  is provided with an opening  324 , and a top portion of the second sound guiding member  320  has two sides surroundingly connected to the resonance film frame  220 . The back frame unit  330  may be a permeable or resonance material, which is connected to the opening  324 , and may be formed to have one of a continued curved structure, a wave structure and an uneven structure. The first extruding structure  312  and the second extruding structure  322  could be a fin structure or a rib structure. It should be appreciated that, when the speaker body  10  generates a guiding sound wave  70 , the guiding sound wave  70  is guided and transmitted within the resonance cavity  340  to reduce the standing wave of guiding sound wave  70  formed in the sound chamber  40 , thus obtaining better sound tone. Further, the guiding distance of the guiding sound wave  70  may be extended to extend the guiding sound wave  70  toward low frequency range, forming a back sound wave  60 . Further, the back sound wave  60  is compressed to increase the driving force to the back frame unit  33 , thus obtaining better low frequency sound effect. 
     Referring now to  FIG. 2 , which is a top view of a sound guiding portion of an improved speaker structure according to one embodiment of the present invention. The first sound guiding member  310  is positioned above the second sound guiding member  320 . The second sound guiding member  320  correspondingly supports the first sound guiding member  310 . The first sound guiding member  310  and the second sound guiding member  320  form the resonance cavity  340  therebetween. 
     Referring to  FIG. 3 , which is another schematic view of an improved speaker structure according to one embodiment of the present invention. In this figure, the structures, positioning and actions of the speaker body  10  and the resonance body  20  are the same as those as shown in  FIG. 1 , and is hereinafter not repeated. The difference of the instant embodiment from the embodiment as shown in  FIG. 1  exists in the positioning of the sound guiding portion  30  along the perpendicular direction. One end of the first sound guiding member  310  is connected to one end of the resonance film frame  220 , and the other end of the first sound guiding member  310  extends horizontally toward two sides along a bottom of the speaker body  10 , and is connected to one end of the bottom portion of the second sound guiding member  320 . The other end of the second sound guiding member  320  is connected to another end of the resonance film frame  220 . The first sound guiding member  310  has a hollow first extruding structure  312  extruding inwards and correspondingly positioned to support the second sound guiding member  320 , and the second sound guiding member  320  has a hollow second extruding structure  322  extruding outwards and is correspondingly positioned above the first sound guiding member  310 . The first extruding structure  312  and the second extruding structure  322  do not contact each other, and the first sound guiding member  310  and the second sound guiding member  320  form a resonance cavity  340 . A top portion of the second sound guiding member  320  is provided with an opening  324 , and the back frame unit  330  is connected to the opening  324 . It should be appreciated that, when the speaker body  10  generates a guiding sound wave  70 , the guiding sound wave  70  is guided and transmitted within the resonance cavity  340  to reduce the standing wave of guiding sound wave  70  formed in the sound chamber  40 , thus obtaining better sound tone. Further, the guiding distance of the guiding sound wave  70  may be extended to extend the guiding sound wave  70  toward low frequency range, forming a back sound wave  60 . Further, the back sound wave  60  is compressed to increase the driving force to the back frame unit  330 , thus obtaining better low frequency sound effect. 
     Referring to  FIG. 4 , which is a further schematic view of an improved speaker structure according to one embodiment of the present invention. In this figure, the structures, positioning and actions of the speaker body  10  and the resonance body  20  and the structure of the sound guiding portion  30  are the same as those as shown in  FIG. 1 , and is hereinafter not repeated. The difference of the instant embodiment from the embodiment as shown in  FIG. 1  exists in that the sound guiding portion  30  as shown in  FIG. 1  is positioned surrounding the bottom of the speaker body  10  in a perpendicular distribution, and the sound guiding portion  30  as shown in  FIG. 4  is positioned surrounding the bottom of the speaker body  10  in a horizontal distribution. The first sound guiding member  310  has a hollow first extruding structure  312  extruding away from the speaker body  10  in the horizontal direction and correspondingly positioned at a side of the second sound guiding member  320  near the speaker body  10 , and the second sound guiding member  320  has a hollow second extruding structure  322  extruding towards the speaker body  10  in the horizontal direction and is correspondingly positioned at a side of the first sound guiding member  310  away from the speaker body  10 . The first extruding structure  312  and the second extruding structure  322  do not contact each other, and the first sound guiding member  310  and the second sound guiding member  320  form a resonance cavity  340 . A bottom portion of the second sound guiding member  320  is provided with an opening  324 , and a top portion of the second sound guiding member  320  has two sides surroundingly connected to the resonance film frame  220 . The back frame unit  330  is connected to the opening  324 . It should be appreciated that, when the speaker body  10  generates a guiding sound wave  70 , the guiding sound wave  70  is guided and transmitted within the resonance cavity  340  to reduce the standing wave of guiding sound wave  70  formed in the sound chamber  40 , thus obtaining better sound tone. Further, the guiding distance of the guiding sound wave  70  may be extended to extend the guiding sound wave  70  toward low frequency range, forming a back sound wave  60 . Further, the back sound wave  60  is compressed to increase the driving force to the back frame unit  330 , thus obtaining better low frequency sound effect. 
     The abovementioned embodiments are provided to illustrate the principles and exemplary methods of manufacturing or formation method of the present invention only. The scope of the present invention shall be defined by the claims recited hereafter, and any modifications or variations to the terms or wordings recited in the claims shall be considered as their relevant equivalence and are within the scope of the present invention. The scope of the present invention shall be determined by the content of the claims recited hereafter.