Patent Publication Number: US-2016249136-A1

Title: Loudspeaker and loudspeaker driver

Description:
BACKGROUND OF THE INVENTION 
     1. Field of the Invention 
     The present disclosure relates to a loudspeaker and a loudspeaker driver; in particular, to a loudspeaker and a loudspeaker driver having a double-roll surround structure. 
     2. Description of Related Art 
     Small loudspeakers are lightweight, easy to install and cheap, and are therefore commonly used in the market. However, the small size of a small loudspeaker compromises the ability of the loudspeaker to produce bass sound, which is related to the magnitude of vibration of the diaphragm and the loudspeaker driver. As shown in  FIG. 1  and  FIG. 2 , a loudspeaker driver A 100  of a small loudspeaker A 300  can be suspended on a housing A 200  by an outer surround portion A 70 , for increasing the magnitude of vibration of the loudspeaker driver A 100  and its diaphragm A 20 , for obtaining a bass effect. However, when the diaphragm A 20  vibrates by a great magnitude such that the loudspeaker unit A 100  on the housing A 200  moves along an axial direction, irregular movements, such as undesired horizontal movements, often result. Since a motion strictly along the axial direction cannot be realized, the vibration of the diaphragm A 20  is uneven and sound is distorted and unclear, even if a stiffer outer surround portion A 70  is used. 
     Hence, the present inventor believes the above mentioned disadvantages can be overcome, and through devoted research combined with application of theory, finally proposes the present disclosure which has a reasonable design and effectively improves upon the above mentioned disadvantages. 
     SUMMARY OF THE INVENTION 
     The object of the present disclosure is to provide a loudspeaker and a loudspeaker driver, which can resist irregular movement for preventing distortion and loss of clarity of sound and preserving a preferred bass effect. 
     In order to achieve the aforementioned objects, the present disclosure provides a loudspeaker driver adaptable to be mounted to a housing. The loudspeaker driver includes a conical frame, a diaphragm, an inner surround portion, a magnetic assembly, a voice coil, and a double-roll surround structure. The upper portion of the conical frame is formed with an opening The diaphragm is positioned at the opening of the conical frame. The inner surround portion is connected between the periphery of the diaphragm and the edge of the opening of the conical frame. The magnetic assembly is disposed in the lower portion of the conical frame. The voice coil is positioned below the diaphragm and corresponds to the magnetic assembly. The double-roll surround structure is connected between the periphery of the conical frame and the housing. 
     In summary of the above, the loudspeaker driver of the present disclosure can be suspended on the housing through the double-roll surround structure for increasing the magnitude of vibration of the loudspeaker driver and its diaphragm, thereby increasing the bass effect of the loudspeaker. Additionally, when the diaphragm undergoes a piston-like motion and creates vibration of a great magnitude, such that the loudspeaker driver suspended on the housing is driven to move along an axial direction, the design of the double-roll surround structure resists irregular movements for preventing distortion and loss of clarity of sound, and preserving a preferred bass effect. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG. 1  shows a cross-sectional view of a conventional loudspeaker driver; 
         FIG. 2  shows a cross-sectional view of a conventional loudspeaker; 
         FIG. 3  shows a top view of a loudspeaker driver according to the present disclosure; 
         FIG. 4  shows a perspective of a loudspeaker driver according to the present disclosure; 
         FIG. 5  shows a perspective view from another angle of a loudspeaker driver according to the present disclosure; 
         FIG. 6  shows a cross-sectional view of a loudspeaker driver according to the present disclosure; 
         FIG. 7  shows a cross-sectional view of a loudspeaker according to the present disclosure; and 
         FIG. 8  shows a view indicating motion of a loudspeaker according to the present disclosure. 
     
    
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS 
     The aforementioned illustrations and following detailed descriptions are exemplary for the purpose of further explaining the scope of the present disclosure. Other objectives and advantages related to the present disclosure will be illustrated in the subsequent descriptions and appended drawings. 
     Referring to  FIG. 3  to  FIG. 7 , the present disclosure provides a loudspeaker and a loudspeaker driver. The loudspeaker driver  100  is adaptable to be mounted on a housing  200 . The housing  200  can be a sound box. The material of the sound box can be wood, plastic, or a combination of materials, and is not limited to the above. The structure of the housing  200  is also not limited, and can be modified according to need. In the present embodiment, the loudspeaker driver  100  is for example a loudspeaker driver of a small loudspeaker, and comprises a conical frame  10 , a diaphragm  20 , an inner surround portion  30 , a magnetic assembly  40 , a voice coil  50 , and a double-roll surround structure  70 . 
     The conical frame  10  is made of for example metal, and is the main structure of the loudspeaker driver  100 . The contour of the conical frame  10  is substantially conical, but is not limited thereto, and can be modified according to need. Additionally, the conical frame  10  can be partitioned into an upper portion  11  and a lower portion  12 . The upper portion  11  of the conical frame  10  is formed with an opening  111 . 
     The diaphragm  20  can be a sound basin made of paper pulp for example, but can also be made of cloth, silk, canvas, ceramic, synthetic fiber, metal, plastic, or polymer, but is not limited thereto. The diaphragm  20  is substantially conical and is positioned at the opening  111  of the conical frame  10 . In other embodiments, the diaphragm  20  can be planar. 
     The inner surround portion  30  can be made of silicon, cloth, rubber, or foam for example, and is connected between the periphery of the diaphragm  20  and the edge of the opening  111  of the conical frame  10 , such that the diaphragm  20  can be connected to the conical frame  10  through the inner surround portion  30 . Of particular note, the present embodiment shows only one strip of inner surround portion  30 . In another embodiment not shown in the figures, an additional strip of inner surround portion can be adhered under the inner surround portion  30 . By attaching two strips of surround portions together, they are less easily deformed during vibration. 
     The magnetic assembly  40  is disposed in the lower portion  12  of the conical frame  10 . The magnetic assembly  40  can be for example inside magnetic, including a washer and two magnetic units of different poles. The magnetic units can be yoke iron or magnets. The magnetic assembly  40  can also be outside magnetic. Additionally, the void coil  50  is positioned below the diaphragm  20  and sleeves the magnetic assembly  40 . By this configuration, when electric current passes through the voice coil  50 , electromagnetic effects with the magnetic assembly  40  cause the voice coil  50  connected to the diaphragm to vibrate up and down, driving the diaphragm  20  to also move up and down for producing sound. Of particular note, a person skilled in the art can freely implement the arrangement of the magnetic assembly  40  and the voice coil  50  such that the voice coil  50  and the magnetic assembly  40  can produce an electromagnetic effect therebetween. The arrangement of the magnetic assembly  40  and the voice coil  50  inside the conical frame  10  is not limited to that of the present embodiment. 
     The loudspeaker driver  100  can further comprise an elastic wave member  60  disposed in the conical frame  10  and surrounding the voice coil  50 , for supporting the voice coil  50  when the voice coil  50  is driven to move. Of particular note, the arrangement of the elastic wave member  60  is not limited to that of the present embodiment. 
     One edge of the double-roll surround structure  70  is connected to the periphery of the conical frame  10 , and another edge of the double-roll surround structure  70  can be connected to the housing  200  (as shown in  FIG. 6 ). Namely, when the double-roll surround structure  70  is connected between the conical frame  10  and the housing  200 , the loudspeaker driver  100  is connected to the housing  200  through the double-roll surround structure  70  and forms a loudspeaker  300  (as shown in  FIG. 7 ). 
     Specifically, the double-roll surround structure  70  includes a first outer surround side  71  and a second outer surround side  72 . The first outer surround side  71  and the second outer surround side  72  are made of for example silicon, cloth, rubber, or foam. Preferably, the first outer surround side  71  and the second outer surround side  72  are made of the same material. Additionally, the first outer surround side  71  and the second outer surround side  72  are both annular and aligned on top of each other. Specifically, the first outer surround side  71  has a first inner bend portion  711 , a first outer bend portion  712 , and a first arc portion  713  connected between the first inner bend portion  711  and the first outer bend portion  712 . Similarly, the second outer surround side  72  has a second inner bend portion  721 , a second outer bend portion  722 , and a second arc portion  723  connected between the second inner bend portion  721  and the second outer bend portion  722 . Additionally, the structure of the first outer surround side  71  and the structure of the second outer surround side  72  can be identical or not identical. For example, the length of the first inner bend portion  711  and the length of the second inner bend portion  721  can be the same or not the same. In more detail, the first inner bend portion  711  and the second inner bend portion  721  adhere to each other, the first outer bend portion  721  and the second outer bend portion  722  adhere to each other, the first arc portion  713  concaves upward, and the second arc portion  723  concaves downward. Namely, the first arc portion  713  and the second arc portion  723  concaves toward opposite directions. In further detail, an upper surface of the first inner bend portion  711  adheres to an annular protruding portion  13  formed at an outer edge of the conical frame  10 , a lower surface of the second outer bend portion  722  adheres to an inner edge of the housing  200  such that the loudspeaker driver  100  is suspended on the housing  200 . 
     Therefore, the loudspeaker driver  100  of the present embodiment can be suspended on the housing  200  through the design of the double-roll surround structure  70 , for increasing the magnitude of vibration of the loudspeaker driver  100  and the diaphragm  20 , thereby increasing the bass effect of the loudspeaker  300 . Additionally, when the diaphragm  20  undergoes a piston-like motion and creates vibration of a great magnitude, such that the loudspeaker driver  100  suspended on the housing  200  is driven to move along an axial direction, the design of the double-roll surround structure  70  resists irregular movements, such as horizontal movement shown by horizontal arrows in  FIG. 8 , for preventing distortion and loss of clarity of sound, and preserving a preferred bass effect. 
     The descriptions illustrated supra set forth simply the preferred embodiments of the present disclosure; however, the characteristics of the present disclosure are by no means restricted thereto. All changes, alterations, or modifications conveniently considered by those skilled in the art are deemed to be encompassed within the scope of the present disclosure delineated by the following claims.