Patent Publication Number: US-2023156407-A1

Title: Loudspeaker and assembly method therefor, vibration mechanism, and loudspeaker device

Description:
BACKGROUND OF THE PRESENT INVENTION 
     Field of Invention 
     The present invention relates to the field of sound, and more particularly to a loudspeaker and assembly method thereof. 
     Description of Related Arts 
       FIGS.  1  to  3    show a loudspeaker  100 P according to a prior art, the loudspeaker  100 P includes a frame  10 P, a magnetic circuit system  20 P, a paper cone  30 P, a suspension element  40 P, and a voice coil  50 P, wherein the magnetic circuit system  20 P is mounted on a lower end portion  11 P of the frame  10 P, wherein outer and inner sides of the suspension element  40 P are respectively extended to be connected to an upper end portion  12 P of the frame  10 P and an outer edge  31 P of the paper cone  30 P, so as to maintain the paper cone  30 P on the upper end portion  12 P of the frame  10 P, wherein a voice coil lower end  51 P of the voice coil  50 P and the magnetic circuit system  20 P are magnetically coupled with each other, wherein a voice coil upper end  52 P of the voice coil  50 P is connected to the center of the paper cone  30 P. The loudspeaker  100 P has a central axis  101 P, wherein a central axis of the paper cone  30 P, a central axis of the suspension element  40 P and a central axis of the voice coil  50 P all coincide with the central axis  101 P of the loudspeaker  100 P. In other words, the paper cone  30 P is centrally symmetric with respect to the central axis  101 P of the loudspeaker  100 P, wherein the suspension element  40 P is centrally symmetric with respect to the central axis  101 P of the loudspeaker  100 P, wherein the voice coil  50 P is centrally symmetric with respect to the central axis  101 P of the loudspeaker  100 P. When the loudspeaker responds to the input of an audio signal, the magnetic circuit system  20 P and the voice coil  50 P interact with each other to drive the paper cone  30 P to reciprocate along the central axis  101 P of the loudspeaker  100 P, so that the paper cone  30 P can agitate air, so as to generate sound waves, wherein the suspension element  40 P is used to limit the stroke of the paper cone  30 P to ensure the movement direction of the paper cone  30 P. 
       FIG.  4    and  FIG.  5    show a loudspeaker device according to the prior art, wherein the loudspeaker device includes a cabinet  200 P and the loudspeaker  100 P mounted on the cabinet  200 P. When designing the existing loudspeaker device, in order to ensure the aesthetics of the loudspeaker device, the loudspeaker  100 P is installed along a center line of a front baffle  201 P of the cabinet  200 P, so that the distances from the central axis  101 P of the loudspeaker  100 P to two side edges of the front baffle  201 P are exactly equal, which will cause loudspeaker device diffraction at the edge of the cabinet  200 P and affect the sound quality of the loudspeaker device. In order to reduce or even avoid the diffraction problem, the loudspeaker devices in the prior art all adopt a method of designing a shape of the cabinet  200 P, for example, the cabinet  200 P is designed to be asymmetrical to avoid the distances from the central axis  101 P of the loudspeaker  100 P to the two side edges of the cabinet  200 P being equal. This method not only requires the designer to have professional acoustic knowledge, but also causes the cabinet  200 P to be unable to be designed into a regular shape. In detail,  FIG.  6 A  shows a radiation state of a left reflected sound wave  1000 P reflected by a left edge of the front baffle  201 P of the cabinet  200 P, wherein  FIG.  6 B  shows a radiation state of a right side reflected sound wave  2000 P reflected by a right edge of the plate  201 P of the front baffle of the cabinet  200 P, wherein  FIG.  6 C  shows a radiation state of a composite sound wave  3000 P formed after the left side reflected sound wave  1000 P and the right side reflected sound wave  2000 P encounter with each other. The peak of the left radiated sound wave  1000 P appears at the same time with the peak of the right radiated sound wave  2000 P, so the composite sound wave  3000 P will suddenly overlap and seriously affect the sound quality of the loudspeaker device. 
     SUMMARY OF THE PRESENT INVENTION 
     The invention is advantageous in that it provides a loudspeaker and assembly method thereof, and vibration mechanism and loudspeaker device, wherein an induced position of a paper cone of the loudspeaker is deviated from a central axis of the loudspeaker, so that when the loudspeaker is installed to a front baffle of a cabinet, a loudspeaker device is formed by the cabinet and the loudspeaker, that can reduce or even avoid the sound diffraction problem and ensure the sound quality of the loudspeaker device. 
     Another advantage of the invention is to provide a loudspeaker and assembly method thereof, vibration mechanism and loudspeaker device, wherein the induced position of the paper cone of the loudspeaker is deviated from the central axis of the loudspeaker, so that the loudspeaker device according to the present invention can reduce or even avoid the sound diffraction problem without needing a special design of the cabinet, so that designers who are not familiar with or even have no knowledge of acoustic expertise can easily design and create the loudspeaker device with a good sound quality. 
     Another advantage of the invention is to provide a loudspeaker and assembly method thereof, vibration mechanism and loudspeaker device, wherein a connection position between a voice coil of the loudspeaker and a paper cone defines the induced position of the paper cone, and the voice coil is arranged to reciprocate along a moving axis of the loudspeaker, so as to induce the paper cone to reciprocate, wherein the moving axis of the loudspeaker deviates from the central axis of the loudspeaker. 
     Another advantage of the invention is to provide a loudspeaker and assembly method thereof, vibration mechanism and loudspeaker device, wherein the moving axis of the loudspeaker passes through a center of gravity of a paper cone, so that when the voice coil induces the paper cone to reciprocate along the moving axis, the paper cone can be kept in a horizontal state to avoid deflection, so as to ensure the sound quality of the loudspeaker. 
     Another advantage of the invention is to provide a loudspeaker and assembly method thereof, vibration mechanism and loudspeaker device, wherein the paper cone has an axis-near position and an axis-far position opposite to the axis-near position, wherein a thickness of the paper cone gradually becomes thinner from the axis-near position to the axis-far position, so that the moving axis of the loudspeaker passes through the center of gravity of the paper cone. 
     Another advantage of the invention is to provide a loudspeaker and assembly method thereof, vibration mechanism and loudspeaker device, wherein a thickness of the suspension element of the loudspeaker gradually becomes thinner from a position of the suspension element corresponding to the axis-near position of the paper cone toward the position of the suspension element corresponding to the axis-far position of the paper cone, so that the moving axis of the loudspeaker can pass through a center of gravity of a vibration mechanism formed by the paper cone and the suspension element, so that the paper cone can be induced to move while the paper cone is kept to be horizontal. 
     Another advantage of the present invention is to provide a loudspeaker and assembly method thereof, vibration mechanism and loudspeaker device, wherein a thickness of a glue layer for bonding the suspension element and the paper cone gradually becomes thinner from the axis-near position of the paper cone to the axis-far position of the paper cone, so that the moving axis of the loudspeaker can pass through the center of gravity of the vibration mechanism formed by the paper cone, the suspension element and the glue layer, so that the paper cone can be induced to move while the paper cone is kept to be horizontal. 
     According to one aspect of the present invention, the present invention provides a loudspeaker comprising: 
     a magnetic circuit system;   a paper cone having a paper cone outer side and an induced position;   a suspension element having a suspension element inner side and a suspension element outer side opposite to the suspension element inner side;   a voice coil having a voice coil lower end and a voice coil upper end opposite to the voice coil lower end; and   a frame having a frame lower end and a frame upper end opposite to the frame lower end, wherein the magnetic circuit system is mounted to the frame lower end of the frame, wherein the suspension element inner side of the suspension element is extended inward to be connected to the paper cone outer side of the paper cone, wherein the suspension element outer side of the suspension element is extended outward to be connected to the frame upper end of the frame, wherein the voice coil upper end is connected to the induced position of the paper cone, wherein the voice coil lower end of the voice coil and the magnetic circuit system are magnetically coupled with each other, wherein the induced position of the paper cone deviates from a central axis of the loudspeaker.   

     According to an embodiment of the present invention, the paper cone has an axis-near position and an axis-far position opposite to the axis-near position, wherein a thickness of the paper cone gradually becomes thinner from the axis-near position to the axis- far position. 
     According to an embodiment of the present invention, the paper cone has an axis-near position and an axis-far position opposite to the axis-near position, wherein a thickness of the suspension element gradually becomes thinner from a position of the suspension element corresponding to the axis-near position to another position of the suspension element corresponding to the axis-far position. 
     According to an embodiment of the present invention, the loudspeaker further comprises a glue layer attaching the suspension element inner side of the suspension element to the paper cone outer side of the paper cone, wherein a thickness of the glue layer gradually becomes thinner from the axis-near position of the paper cone to the axis-far position of the paper cone. 
     According to an embodiment of the present invention, the paper cone has an axis-near position and an axis-far position opposite to the axis-near position, wherein a thickness of the paper cone gradually becomes thinner from the axis-near position to the axis- far position, wherein a thickness of the suspension element gradually becomes thinner from a position of the suspension element corresponding to the axis-near position to another position of the suspension element corresponding to the axis-far position. 
     According to an embodiment of the present invention, the paper cone and the suspension element are integrally formed. 
     According to an embodiment of the present invention, the frame comprises a lower end frame and an upper end frame mounted to the lower end frame, wherein the lower end frame further comprises a magnetic circuit mounting ring, an engaging ring, and a plurality of connecting arms spacedly extended between the magnetic circuit mounting ring and the engaging ring, wherein a central axis of the magnetic circuit system and a central axis of the engaging ring deviate from each other, wherein the magnetic circuit system is mounted to the magnetic circuit mounting ring, wherein the upper end frame comprises a retaining ring and at least two engaging arms extended downward from the retaining ring, wherein the suspension element outer side of the suspension element is connected to the retaining ring of the upper end frame, wherein the at least two engaging arms of the upper end frame is mounted to the engaging ring of the lower end frame, wherein a central axis of the retaining ring and the central axis of the engaging ring coincide with each other. 
     According to an embodiment of the present invention, the loudspeaker further comprises an axis stabling element, wherein the axis stabling element has an axis stabling element inner side and an axis stabling element outer side opposite to the axis stabling element inner side, wherein the axis stabling element inner side of the axis stabling element is connected to the voice coil, wherein the axis stabling element outer side of the axis stabling element is connected to the frame. 
     According to an embodiment of the present invention, a shape of the paper cone is one of a horn-like structure and a flat plate-like structure. 
     According to another aspect of the present invention, the present invention further provides a loudspeaker device comprising a cabinet and a loudspeaker, wherein the cabinet comprises a front baffle, wherein the loudspeaker is mounted to the front baffle of the cabinet, wherein the loudspeaker comprises: 
     a magnetic circuit system;   a paper cone having a paper cone outer side and an induced position;   a suspension element having a suspension element inner side and a suspension element outer side opposite to the suspension element inner side;   a voice coil having a voice coil lower end and a voice coil upper end opposite to the voice coil lower end; and   a frame having a frame lower end and a frame upper end opposite to the frame lower end, wherein the magnetic circuit system is mounted to the frame lower end of the frame, wherein the suspension element inner side of the suspension element is extended inward to be connected to the paper cone outer side of the paper cone, wherein the suspension element outer side of the suspension element is extended outward to be connected to the frame upper end of the frame, wherein the voice coil upper end is connected to the induced position of the paper cone, wherein the voice coil lower end of the voice coil and the magnetic circuit system connect with each other in such a manner that the voice coil lower end of the voice coil and the magnetic circuit system magnetically interact with each other, wherein the induced position of the paper cone deviate to a central axis of the loudspeaker.   

     According to an embodiment of the present invention, the paper cone has an axis-near position and an axis-far position opposite to the axis-near position, wherein a thickness of the paper cone gradually becomes thinner from the axis-near position to the axis-far position. 
     According to an embodiment of the present invention, the paper cone has an axis-near position and an axis-far position opposite to the axis-near position, wherein a thickness of the suspension element gradually becomes thinner from a position of the suspension element corresponding to the axis-near position to another position of the suspension element corresponding to the axis-far position. 
     According to an embodiment of the present invention, the loudspeaker further comprises a glue layer attaching the suspension element inner side of the suspension element to the paper cone outer side of the paper cone, wherein a thickness of the glue layer gradually becomes thinner from the axis-near position of the paper cone to the axis-far position of the paper cone. 
     According to an embodiment of the present invention, the paper cone has an axis-near position and an axis-far position opposite to the axis-near position, wherein a thickness of the paper cone gradually becomes thinner from the axis-near position to the axis- far position, wherein a thickness of the suspension element gradually becomes thinner from a position of the suspension element corresponding to the axis-near position to another position of the suspension element corresponding to the axis-far position. 
     According to an embodiment of the present invention, the paper cone and the suspension element are integrally formed. 
     According to an embodiment of the present invention, the frame comprises a lower end frame and an upper end frame mounted to the lower end frame, wherein the lower end frame further comprises a magnetic circuit mounting ring, an engaging ring, and a plurality of connecting arms spacedly extended between the magnetic circuit mounting ring and the engaging ring, wherein a central axis of the magnetic circuit system and a central axis of the engaging ring deviate from each other, wherein the magnetic circuit system is mounted to the magnetic circuit mounting ring, wherein the upper end frame comprises a retaining ring and at least two engaging arms extended downward from the retaining ring, wherein the suspension element outer side of the suspension element is connected to the retaining ring of the upper end frame, wherein the at least two engaging arms of the upper end frame is mounted to the engaging ring of the lower end frame, wherein a central axis of the retaining ring and the central axis of the engaging ring coincide with each other. 
     According to an embodiment of the present invention, the loudspeaker further comprises an axis stabling element, wherein the axis stabling element has an axis stabling element inner side and an axis stabling element outer side opposite to the axis stabling element inner side, wherein the axis stabling element inner side of the axis stabling element is connected to the voice coil, wherein the axis stabling element outer side of the axis stabling element is connected to the frame. 
     According to an embodiment of the present invention, a shape of the paper cone is one of a horn-like structure and a flat plate-like structure. 
     According to another aspect of the present invention, the present invention further provides a method for assembling a loudspeaker, comprising the following steps: 
     (a) installing a magnetic circuit system to a magnetic circuit mounting ring of a lower end frame in such a manner that a central axis of the magnetic circuit system deviates from a central axis of an engaging ring of the lower end frame;   (b) allowing a suspension element inner side and a suspension element outer side of a suspension element to be connected to a paper cone outer side of a paper cone and a retaining ring of an upper end frame respectively; and   (c) installing the upper end frame to the lower end frame in such a manner that a central axis of the retaining ring and a central axis of the engaging ring coincide with each other, so as to allow a voice coil which is connected to an induced position of the paper cone to be extended toward the magnetic circuit system and is magnetically coupled to the magnetic circuit system, and the induced position of the paper cone is deviated from a central axis of the loudspeaker, so as to assemble the loudspeaker.   

     According to an embodiment of the present invention, the step (b) further comprises the following steps: 
     forming the paper cone by injection molding, wherein a thickness of the paper cone gradually becomes thinner from an axis-near position to an axis-far position of the paper cone; and   integrally forming the suspension element between the paper cone and the retaining ring of the upper end frame.   

     According to an embodiment of the present invention, the step (b) further comprises a following step: integrally forming the suspension element between the paper cone and the retaining ring of the upper end frame, wherein a thickness of the suspension element is gradually thinner from a position corresponding to an axis-near position of the paper cone to another position corresponding to an axis-far position of the paper cone. 
     According to an embodiment of the present invention, the step (b) further comprises the following steps: 
     applying a first glue to the suspension element inner side of the suspension element and/or the paper cone outer side of the paper cone, so as to bond the suspension element inner side of the suspension element to the paper cone outer side of the paper cone, wherein a thickness of a first glue layer retained between the paper cone outer side of the paper cone and the suspension element inner side of the suspension element gradually becomes thinner from an axis-near position to an axis-far position of the paper cone; and   applying a second glue to the suspension element outer side of the suspension element and/or the retaining ring of the upper end frame, so as to bond the suspension element outer side of the suspension element to the retaining ring of the upper end frame.   

     According to an embodiment of the present invention, the step (b) further comprises a following step: integrally forming the paper cone and the suspension element by injection molding, wherein the suspension element outer side of the suspension element is integrally connected to the retaining ring of the upper end frame, wherein a thickness of the paper cone gradually becomes thinner from an axis-near position to an axis-far position of the paper cone, wherein a thickness of the suspension element gradually becomes thinner from a position corresponding to the axis-near position of the paper cone to another position corresponding to the axis-far position of the paper cone. 
     According to another aspect of the present invention, the present invention further provides a vibration mechanism, comprising: 
     a suspension element having a suspension element inner side and a suspension element outer side opposite to the suspension element inner side; and   a paper cone having a paper cone outer side and an induced position, wherein the suspension element inner side of the suspension element connects to the paper cone outer side of the paper cone, wherein the induced position of the paper cone deviates from a central axis of the paper cone.   

     According to an embodiment of the present invention, the paper cone has an axis-near position and an axis-far position opposite to the axis-near position, wherein the induced position of the paper cone is close to the axis-near position and away from the axis-far position. 
     According to an embodiment of the present invention, a center of gravity of the vibration mechanism is close to the axis-near position of the paper cone and away from the axis-far position of the paper cone. 
     According to an embodiment of the present invention, a thickness of the paper cone gradually becomes thinner from the axis-near position to the axis-far position. 
     According to an embodiment of the present invention, a thickness of the suspension element gradually becomes thinner from a position of the suspension element corresponding to the axis-near position to another position of the suspension element corresponding to the axis-far position. 
     According to an embodiment of the present invention, a thickness of the paper cone gradually becomes thinner from the axis-near position to the axis-far position, wherein a thickness of the suspension element gradually becomes thinner from a position of the suspension element corresponding to the axis-near position to another position of the suspension element corresponding to the axis-far position. 
     According to an embodiment of the present invention, the paper cone and the suspension element are integrally formed. 
     According to an embodiment of the present invention, the vibration mechanism further comprises a glue layer attaching the suspension element to the paper cone, wherein the glue layer is provided between the suspension element inner side of the suspension element and the paper cone outer side of the paper cone, wherein a thickness of the glue layer gradually becomes thinner from the axis-near position of the paper cone to the axis-far position of the paper cone. 
     According to an embodiment of the present invention, a shape of the paper cone is one of a horn-like structure and a flat plate-like structure. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG.  1    is a perspective view of a loudspeaker according to a prior art. 
         FIG.  2    is a top view of the loudspeaker according to the above prior art. 
         FIG.  3    is a sectional view of the loudspeaker according to the above prior art. 
         FIG.  4    is a perspective view of a loudspeaker device according to a prior art, wherein the loudspeaker device is incorporated with the loudspeaker illustrated in  FIG.  1    to  FIG.  3   . 
         FIG.  5    is a schematic diagram illustrating the sound wave radiation state of the loudspeaker device in the prior art when sound is emitted. 
         FIGS.  6 A to  6 C  illustrate sound wave radiation states of the loudspeaker device according to the prior art. 
         FIG.  7 A  is a perspective view of a loudspeaker according to a preferred embodiment of the present invention. 
         FIG.  7 B  is another perspective view of the loudspeaker according to the above preferred embodiment of the present invention. 
         FIG.  8    is an exploded view of the loudspeaker according to the above preferred embodiment of the present invention. 
         FIG.  9    is a cross-sectional view of the loudspeaker according to the above preferred embodiment of the present invention. 
         FIG.  10    is a perspective view of a loudspeaker according to a first modified mode of the above preferred embodiment of the present invention. 
         FIG.  11    is a cross-sectional view of the loudspeaker according to the above first modified mode of the above preferred embodiment of the present invention. 
         FIG.  12    is a cross-sectional view of a loudspeaker according to a second modified mode of the above preferred embodiment of the present invention. 
         FIG.  13    is a cross-sectional view of a loudspeaker according to a third modified mode of the above preferred embodiment of the present invention. 
         FIG.  14    is a perspective view of a loudspeaker device according to a preferred embodiment of the present invention. 
         FIG.  15    is a front view of the loudspeaker device according to the above preferred embodiment of the present invention. 
         FIG.  16    is a top view of the loudspeaker device according to the above preferred embodiment of the present invention, illustrating the radiation state of sound waves generated by the loudspeaker of the loudspeaker device. 
         FIGS.  17 A to  17 C  illustrate the sound wave radiation states of the loudspeaker device according to the above preferred embodiment of the present invention. 
     
    
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT 
     The following description is disclosed to enable any person skilled in the art to make and use the present invention. Preferred embodiments are provided in the following description only as examples and modifications will be apparent to those skilled in the art. The general principles defined in the following description would be applied to other embodiments, alternatives, modifications, equivalents, and applications without departing from the spirit and scope of the present invention. 
     Those skilled in the art should understand that, in the disclosure of the present invention, terminologies of “longitudinal,” “lateral,” “upper,” “front,” “back,” “left,” “right,” “perpendicular,” “horizontal,” “top,” “bottom,” “inner,” “outer,” and etc. that indicate relations of directions or positions are based on the relations of directions or positions shown in the appended drawings, which are only to facilitate descriptions of the present invention and to simplify the descriptions, rather than to indicate or imply that the referred device or element is limited to the specific direction or to be operated or configured in the specific direction. Therefore, the above terminologies shall not be interpreted as confine to the present invention. 
     It should be understood that the term “a” should be understood as “at least one” or “one or more”. In other words, in one embodiment, the number of an element may be one, and in another embodiment, the number of the element may be plural. The term “one” should not be understood as a limitation on the number. 
     Referring to  FIGS.  7 A to  9    of the drawings, a loudspeaker  100  according to a preferred embodiment of the present invention is disclosed and explained in the following description, wherein the loudspeaker  100  comprises a frame  10 , a magnetic circuit system  20 , a suspension element  30 , a paper cone  40  and a voice coil  50 . 
     The frame  10  has a frame lower end  11  and a frame upper end  12  opposite to the frame lower end  11 . 
     The magnetic circuit system  20  has a magnetic gap  21  and a magnetic gap opening  22  communicating with the magnetic gap  21 , wherein the magnetic circuit system  20  is mounted on the frame lower end  11  of the frame  10 , and the magnetic gap opening  22  of the magnetic circuit system  20  faces to the frame upper end  12  of the frame  10 . 
     The paper cone  40  has a paper cone outer side  41 . The suspension element  30  has a suspension element inner side  31  and a suspension element outer side  32  opposite to the suspension element inner side  31 , wherein the suspension element inner side  31  of the suspension element  30  is extended inward, so as to be connected to the paper cone outer side  41  of the paper cone  40 . The suspension element outer side  32  of the suspension element  30  is extended outward, so as to be connected to the frame upper end  12  of the frame  10 , so that the paper cone  40  is held to the frame upper end  12  of the frame  10  with the help of the suspension element  30 . 
     The voice coil  50  has a voice coil lower end  51  and a voice coil upper end  52  opposite to the voice coil lower end  51 , wherein the voice coil lower end  51  of the voice coil  50  passes through the magnetic gap opening  22  of the magnetic circuit system  20  and is extended into the magnetic gap  21  of the magnetic circuit system  20 , and the voice coil lower end  51  of the voice coil  50  is movably held in the magnetic gap  21  of the magnetic circuit system  20 . The voice coil lower end  51  of the voice coil  50  and the magnetic circuit system  20  are magnetically coupled with each other, so that the voice coil lower end  51  of the voice coil  50  and the magnetic circuit system  20  can interact with each other. Accordingly, the voice coil upper end  52  of the voice coil  50  is extended to and connected to the paper cone  40 , so as to define an induced position  42  of the paper cone  40 . The induced position  42  of the paper cone  40  deviates from a central axis  101  of the loudspeaker  100 . A moving axis  102  of the loudspeaker  100  passes through the induced position  42  of the paper cone  40 . In other words, the moving axis  102  of the loudspeaker  100  deviates from the central axis  101 . 
     When the loudspeaker  100  responds to the input of an audio signal, the magnetic circuit system  20  and the voice coil lower end  51  of the voice coil  50  magnetically interact with each other, so as to allow the magnetic circuit system  20  to induce the paper cone  40  reciprocate along the moving axis  102  of the loudspeaker  100  through the voice coil  50  which drives the paper cone  40  at the induced position  42  of the paper cone  40 , so as to agitate the air to outwardly radiate sound waves , wherein the suspension element  30  limits the stroke of the paper cone  40  and ensures that the paper cone  40  reciprocates along the moving axis  102  of the loudspeaker  100 . 
     Preferably, the moving axis  102  of the loudspeaker  100  passes through the center of gravity of the paper cone  40 , so that when the voice coil  50  drives the paper cone  40  at the induced position  42  of the paper cone  40 , the paper cone  40  reciprocates along the moving axis  102  of the loudspeaker  100 , and the paper cone  40  is capable of being retained horizontal, so as to avoid deviation, so as to ensure the sound quality of the loudspeaker  100 . 
     Referring to  FIG.  7 A  to  FIG.  9   , in the loudspeaker  100  according to this preferred embodiment of the present invention, the paper cone  40  has an axis-near position  43  and an axis-far position  44  opposite to the axis-near position  43 , wherein the axis-near position  43  of the paper cone  40  refers to an edge position of the paper cone outer side  41  of the paper cone  40  that is closest to the moving axis  102  of the loudspeaker  100 . The axis-far position  44  refers to the edge position of the outer side  41  of the paper cone  40  that is farthest from the moving axis  102  of the loudspeaker  100 . In the loudspeaker  100  according to this preferred embodiment of the present invention, the thickness of the paper cone  40  gradually becomes thinner from the axis-near position  43  to the axis-far position  44 , so that the center of gravity of the paper cone  40  is close to the axis-near position  44  and far from the axis-far position  43 , so that the moving axis  102  of the loudspeaker  100  passes through the center of gravity of the paper cone  40 . Hence, when the voice coil  50  drives the paper cone  40  to reciprocate along the moving axis  102  of the loudspeaker  100 , the paper cone  40  is retained horizontal, so as to avoid tilting, so as to ensure the sound quality of the loudspeaker  100 . 
     Furthermore, referring to  FIG.  7 A  to  FIG.  9   , the frame  10  comprises a lower end frame  13  and a upper end frame  14  mounted on the lower end frame  13 , wherein the lower end frame  13  forms the frame lower end  11  of the frame  10 . The magnetic circuit system  20  is mounted on the lower end frame  13 , so that the magnetic circuit system  20  is held at the frame lower end  11 . Correspondingly, the upper end frame  14  forms the frame upper end  12  of the frame  10 . The suspension element outer side  32  of the suspension element  30  is connected to the upper end frame  14 , so that the paper cone  40  connected with the suspension element  30  is held to the frame upper end  12 . 
     In more details, referring to  FIGS.  7 B and  8   , the lower end frame  13  further comprises a magnetic circuit mounting ring  131 , an engaging ring  132 , and a plurality of connecting arms  133  extended between the magnetic circuit mounting ring  131  and the engaging ring  132 . The magnetic circuit mounting ring  131  of the lower end frame  13  is mounted to the magnetic circuit system  20  in such a manner that the magnetic circuit mounting ring  131  surrounds the outer side of the magnetic circuit system  20 , so that the magnetic circuit system  20  is mounted to the lower frame  13 . The central axis of the magnetic circuit mounting ring  131  and the central axis of the engaging ring  132  are deviated from each other and are not coincided with each other, so that the central axis of the magnetic circuit system  20  mounted on the magnetic circuit mounting ring  131  and the center axis of the engaging rings  132  are deviated from each other, and thus they are not coincided with each other. 
     Correspondingly, the upper end frame  14  comprises a retaining ring  141  and at least two engaging arms  142  extended downward from the retaining ring  141 , wherein the suspension element outer side  32  of the suspension element  30  is connected to the retaining ring  141  of the upper end frame  14 , so as to allow the retaining ring  141  to surround the paper cone  40 . The engaging arms  142  of the upper end frame  14  are mounted to the engaging ring  132  of the lower end frame  13 . The central axis of the retaining ring  141  of the upper end frame  14  and the central axis of the engaging ring  132  coincide with each other, so that the central axis of the magnetic circuit system  20  and the central axis of the retaining ring  141  deviate from each other, and thus they are not coincided with each other. 
     It is worth mentioning that, in the loudspeaker  100  according to this preferred embodiment of the present invention, the central axis of the retaining ring  141  of the upper end frame  14  and the central axis of the engaging ring  132  of the lower end frame  13  defines the central axis  101  of the loudspeaker  100 . The central axis  101  of the loudspeaker  100 , the central axis of the retaining ring  141  of the upper end frame  14 , and the central axis of the engaging ring  132  of the lower end frame  13  coincide with each other. Correspondingly, the central axis of the magnetic circuit system  20  defines the moving axis  102  of the loudspeaker  100 , and the moving axis  102  of the loudspeaker  100  and the central axis of the magnetic circuit system  20  coincide with each other. In the loudspeaker  100  according to this preferred embodiment of the present invention, the central axis of the magnetic circuit system  20  is deviated from the central axis of the retaining ring  141  of the upper end frame  14  and the central axis of the engaging ring  132  of the lower end frame  13 , so that the moving axis  102  of the loudspeaker  100  deviates from the central axis  101  of the loudspeaker  100 . 
     Referring to  FIGS.  7 A to  9   , in the loudspeaker  100  according to this preferred embodiment of the present invention, the paper cone  40  can be formed by injection molding, so that the thickness of the paper cone  40  can gradually becomes thinner from the axis-near position  43  to the axis-far position  44 . The forming method of the suspension element  30  is not limited in the present invention. For example, according to an embodiment of the present invention, the suspension element  30  is prefabricated, wherein the suspension element inner side  31  of the suspension element  30  can be attached to the paper cone outer side  41  of the paper cone  40  by an adhesive substance such as a glue. Correspondingly, the suspension element outer side  32  of the suspension element  30  can be attached to the retaining ring  141  of the upper end frame  14  by an adhesive substance such as a glue. According to another embodiment of the present invention, the suspension element  30  is integrally formed between the paper cone  40  and the retaining ring  141  of the upper end frame  14 , so that the suspension element inner side  31  of the suspension element  30  is integrally connected to the paper cone outer side  41  of the paper cone  40  during the forming process of the suspension element  30 , and the suspension element outer side  32  of the suspension element  30  is integrally connected to the retaining ring  141  of the upper end frame  14  during the forming process of the suspension element  30 . 
     Continuing to refer to  FIG.  7 A  to  FIG.  9   , the loudspeaker  100  further comprises an axis stabling element  60 , wherein the axis stabling element  60  has an axis stabling element inner side  61  and an axis stabling element outer side  62  opposite to the axis stabling element inner side  61 , wherein the axis stabling element inner side  61  of the axis stabling element  60  is extended to and connected to the voice coil  50 , wherein the axis stabling element outer side  62  of the axis stabling element  60  is extended to and connected to the frame  10 , wherein when the magnetic circuit system  20  induces the voice coil  50  to reciprocate along the moving axis  102  of the loudspeaker  100 , the voice coil  50  can drive the axis stabling element  60  to deform, so as to restrict the reciprocating direction of the voice coil  50  with the help of the axis stabling element  60 , and further prevent the moving direction of the voice coil  50  from deviating from the moving axis  102  of the loudspeaker  100 . 
     Furthermore, the lower end frame  13  comprises an engaging platform  134 , wherein the engaging platform  134  is extended inward from the engaging ring  132 , wherein the axis stabling element outer side  62  of the axis stabling element  60  is connected to the engaging platform  134  of the lower end frame  13  end. 
     It is worth mentioning that the shape of the axis stabling element  60  is not limited in the present invention. For example, in the embodiment shown in  FIGS.  7 A to  9   , the axis stabling element  60  can be designed to have a shape similar to the suspension element  30 . In other words, the axis stabling element  60  may have a cross-sectional shape of a “U”, or the axis stabling element  60  may have a cross-sectional shape of an “S”, or the axis stabling element  60  may have a cross-sectional shape of a wave, and according to other embodiments of the present invention, the axis stabling element  60  may be a spider. 
     Continuing to refer to  FIGS.  7 A to  9   , the loudspeaker  100  further comprises a dust cap  70 , wherein the dust cap  70  is installed on the voice coil upper end  52  of the voice coil  50  for sealing the upper end opening of the voice coil  50 , so as to prevent dust from entering the interior of the voice coil  50 . The shape of the dust cap  70  is not limited in the present invention, and it may be a hemispherical structure or a flat plate structure. 
     It is worth mentioning that the shape of the paper cone  40  is not limited in the present invention. For example, in the embodiment shown in  FIGS.  7 A to  9   , the paper cone  40  has a horn-like structure, and in a loudspeaker  100  according to a first modified mode of the above preferred embodiment of the present invention, a paper cone  40  has a flat plate-like structure, as shown in  FIGS.  10  and  11   . 
       FIG.  12    shows a loudspeaker  100 B according to a second modified mode of the above preferred embodiment of the present invention. What is different from the loudspeaker  100  shown in  FIGS.  7 A to  9   , in the loudspeaker  100  shown in  FIG.  12   , the thickness of a paper cone  40  at each position is the same, wherein the thickness of a suspension element  30  is gradually thinner from the position corresponding to an axis-near position  43  of the paper cone  40  to the position of the suspension element  30  corresponding to the axis-far position  44  of the paper cone  40 , so that the center of gravity of a vibration mechanism  103  formed by the suspension element  30  and the paper cone  40  is close to the axis-near position  43  of the paper cone  40 , and is far from the axis-far position  44 , so that a moving axis  102  of the loudspeaker  100  can pass through a center position of the vibration mechanism  103 . Hence, when the voice coil  50  drives the paper cone  40  to reciprocate along the moving axis  102  of the loudspeaker  100 , the paper cone  40  can be kept horizontal and avoid tilting, so as to ensure the sound quality of the loudspeaker  100 . 
     It is worth mentioning that, according to the present invention shown in  FIG.  12   , the paper cone  40  can be made by injection molding process, or can be made by bending a flat structure and bonding the free end of the flat structure. 
       FIG.  13    shows a loudspeaker  100  according to a third alternative mode of the above preferred embodiment of the present invention, what is different from the loudspeaker  100  shown in  FIGS.  7 A to  9   , according to this alternative mode shown in  FIG.  13   , the thickness of a paper cone  40  is the same at every position. The loudspeaker further comprises a glue layer  80  attaching the suspension element inner side  31  of the suspension element  30  to a paper cone outer side  41  of the paper cone  40 , wherein the thickness of the glue layer  80  gradually becomes thinner from an axis-near position  43  to an axis-far position  44  of the paper cone  40 , so that the center of gravity of a vibration mechanism  103  formed by the suspension element  30 , the paper cone  40  and the glue layer  80  is close to the axis-near position  43  of the paper cone  40  and away from the axis-far position  44 , so that a moving axis  102  of the loudspeaker  100  can pass through a center position of the vibration mechanism  103 . Hence, when the voice coil  50  drives the paper cone  40  to reciprocate along the moving axis  102  of the loudspeaker  100 , the paper cone  40  can be kept horizontal and avoid tilting, so as to ensure the sound quality of the loudspeaker  100 . 
     It is worth mentioning that, in the specific embodiment shown in  FIG.  13   , the paper cone  40  can be made by injection molding process, or can be made by bending a flat structure and bonding the free end of the flat structure, wherein the suspension element  30  needs to be prefabricated. 
     According to another aspect of the present invention, the present invention further provides an assembling method of the loudspeaker  100 , wherein the assembling method comprises the following steps: 
     (a) installing the magnetic circuit system  20  to the magnetic circuit mounting ring  131  of the lower end frame  13  in such a manner that the central axis of the magnetic circuit system  20  deviates from the central axis of the coupling ring  132  of the lower end frame  13 ;   (b) allowing the suspension element inner side  31  and the suspension element outer side  32  of the suspension element  30  to be connected to the paper cone outer side  41  of the paper cone  40  and the retaining ring  141  of the upper end frame  14  respectively; and   (c) installing the upper end frame  14  to the lower end frame  13  in such a manner that the central axis of the retaining ring  141  and the central axis of the engaging ring  132  coincide with each other, so that the voice coil  50  connected to the induced position  42  of the paper cone  40  is extended toward the magnetic circuit system  20  and is magnetically coupled with the magnetic circuit system  20 , and the induced position  42  of the paper cone  40  is deviated from the central axis  101  of the loudspeaker  100 , so as to assemble the loudspeaker  100 .   

     According an embodiment of the present invention, the step (b) further comprises the following steps: 
     forming the paper cone  40  by injection molding, so that the thickness of the paper cone  40  gradually becomes thinner from the axis-near position  43  to the axis-far position  44  of the paper cone  40 ; and   integrally forming the suspension element  30  between the paper cone  40  and the retaining ring  141  of the upper end frame  14 .   

     According another embodiment of the present invention, the step (b) further comprises the following step: 
     integrally forming the suspension element  30  between the paper cone  40  and the retaining ring  141  of the upper end frame  14 , wherein the thickness of the suspension element  30  is gradually becoming thinner from the position corresponding to the axis-near position  43  of the paper cone  40  to the position corresponding to the axis-far position  44  of the paper cone  40 . 
     According another embodiment of the present invention, the step (b) further comprises the following steps: 
     applying a first glue to the suspension element inner side  31  of the suspension element  30  and/or the paper cone outer side  41  of the paper cone  40 , so as to bond the suspension element inner side  31  of the suspension element  30  to the paper cone outer side  41  of the paper cone  40 , wherein the thickness of the glue layer  80  retained between the paper cone outer side  41  of the paper cone  40  and the suspension element inner side  31  of the suspension element  30  gradually becomes thinner from the axis-near position  43  to the axis-far position  44  of the paper cone  40 ; and   applying a second glue to the suspension element outer side  32  of the suspension element  30  and/or the retaining ring  141  of the upper end frame  14 , so as to bond the suspension element outer side  32  of the suspension element  30  to the retaining ring  141  of the upper end frame  14 .   

       FIGS.  14  to  17 C  show a loudspeaker device according to a preferred embodiment of the present invention, wherein the loudspeaker device comprises the loudspeaker  100  and a cabinet  200 , wherein the cabinet  200  comprises a front baffle  201 . The loudspeaker  200  is installed on the front baffle  201  of the cabinet  200 . 
     The induced position  42  of the paper cone  40  of the loudspeaker  100  is deviated from the center axis of the loudspeaker  100 . Hence, even the loudspeaker  100  is installed in the middle position of the front baffle  201  of the loudspeaker  100 , the cabinet  200  will not be equidistant on two sides of the moving axis  102  of the loudspeaker  100 , so as to effectively reduce or even avoid diffracting and further ensure the sound quality of the loudspeaker device. In addition, the loudspeaker device can reduce or even avoid the sound diffraction problem without needing a special designing of the cabinet  200 , so that designers who are not familiar with or even have no knowledge of acoustic expertise can easily design and create the loudspeaker device having good sound quality. 
     Furthermore, referring to  FIGS.  16  to  17 C , when the sound waves generated by the loudspeaker  100  are radiated to two sides of the cabinet  200 , there is a time difference between the sound waves reach the left edge of the front baffle  201  of the cabinet  200  and the sound waves reach the right edge of the front baffle  201  of the cabinet  200 . Hence, when the left reflected sound wave  1000  reflected by the left edge of the front baffle  201  and the right reflected sound wave  2000  reflected by the right edge of the front baffle  201  encounter with each other to form a composite sound wave  3000 , the crests and troughs of the left reflected sound wave  1000  and the crests and troughs of the right reflected sound wave  2000  will be staggered to avoid excessive superposition between the left reflected sound wave  1000  and the right reflected sound wave  2000 , so as to reduce or even avoid sound diffraction. 
     One skilled in the art will understand that the embodiment of the present invention as shown in the drawings and described above is exemplary only and not intended to be limiting. 
     It will thus be seen that the objects of the present invention have been fully and effectively accomplished. The embodiments have been shown and described for the purposes of illustrating the functional and structural principles of the present invention and are subject to change without departure from such principles. Therefore, this invention comprises all modifications encompassed within the spirit and scope of the following claims.