Patent Publication Number: US-11026015-B2

Title: Speaker

Description:
TECHNICAL FIELD 
     The present disclosure relates to electroacoustic technologies, and more particularly, to a speaker. 
     BACKGROUND 
     An electroacoustic device is a member in an electronic field. With a development of an electronic industry, an electroacoustic system needs to continuously meet higher requirements of consumers for product performance and to present essence of sound more perfectly. 
     As a core sound member of a speaker, quality for designing a diaphragm directly affects acoustic performance of the speaker. The diaphragm usually includes a dome in a center and a folded ring surrounding the dome. The vibration of the diaphragm is mainly focused on the vibration of the dome. The dome has a larger amplitude and a higher frequency than that of the folded ring, and is an important part for reflecting acoustic effect of a sound device. 
     The dome in existing technologies is a plate structure, and is a rectangle with rounded corners. In order to reduce mass of the dome, holes are usually cut at a straight edge of the dome. Because the dome is prone to split vibration due to insufficient strength when vibrating at a high frequency, cutting holes at the straight edge of the dome is bound to severely reduce strength of the dome and affect high-frequency characteristic of the product. In addition, cutting holes at an edge of the dome will increase a blank area from an inner edge of the folded ring of the diaphragm to an inner edge of the dome, which will easily wrinkle the product and reduce reliability of the product when the product is vibrating and falling. 
     Therefore, it is necessary to provide a new speaker with an improved dome structure. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG. 1  is an exploded perspective view of a speaker according to the present disclosure; 
         FIG. 2  is a plan view of a dome in the speaker according to the present disclosure; and 
         FIG. 3  is a plan view of the dome in the speaker according to the present disclosure. 
     
    
    
     DETAILED DESCRIPTION 
     In order to better understand solutions of the present disclosure and advantages thereof in various aspects, the present disclosure will be described in further detail below with reference to drawings through specific embodiments. In the following embodiments, a left-right direction in a principal plane of the drawing is taken as a horizontal direction, and an up-down direction in the principal plane of the drawing is taken as a vertical direction. In addition, the following specific embodiments are provided to facilitate a clearer and more thorough understanding of contents of the present disclosure, rather than to limit the present disclosure. 
     In order to effectively reduce mass of the dome while ensuring that high-frequency characteristic of the product is not affected, the present disclosure improves a structure of the dome, and the specific solution is as follows. 
     As shown in  FIG. 1  and  FIG. 2 , the present disclosure provides a speaker having a dome with a new structure. The speaker includes a basket  11 , a diaphragm  13  fixed to the basket  11 , a voice coil  15  located below the diaphragm  13  and used for driving the diaphragm  13  to vibrate and sound, and a magnetic circuit system  12  located below the diaphragm  13  and fixed to the basket  11 . The diaphragm includes a dome  131  in a central region and a folded ring  133  surrounding the dome  131 . 
     In this embodiment, as shown in  FIG. 1 , the diaphragm  13  is rectangular, with one side close to a center of the diaphragm  13  as an inner side and one side away from the center of the diaphragm  13  as an outer side. As shown in  FIG. 2  and  FIG. 3 , the dome  131  is a rectangle with rounded corners. The dome  131  includes two opposite first straight edges  132  arranged oppositely and two second straight edges  134  arranged oppositely and connected with the two first straight edges  132 . In this embodiment, the dome  131  is a rectangle with rounded corners formed by connecting neighboring ones of the two first straight edges  132  and the two second straight edges  134  through a smooth transition surface, but the neighboring ones of the first straight edges  132  and the second straight edges  134  may alternatively be directly connected through a right angle (i.e., the dome  131  is rectangular). The dome  131  includes a central portion  1311  located in the middle and an edge portion  1312  surrounding the central portion  1311 . The edge portion  1312  includes a first region  1313  arranged along the first straight edge  132  and a second region  1314  arranged along the second straight edge  134 . 
     Further, both the first region  1313  and the second region  1314  are provided with an opening portion penetrating through the dome  131  along a vibration direction. Specifically, the first region  1313  is provided with a first opening portion  1321  close to the first straight edge  132 , and the first opening portion  1321  is separated from the first straight edge  132 . The second region  1314  is provided with a second opening portion  1341  close to the second straight edge  134 , and the second opening portion  1341  is separated from the second straight edge  134 . An orthogonal projection of the first opening portion  1321  along the vibration direction is the same as an orthogonal projection of the second opening portion  1341  along the vibration direction. Cross-sectional shapes of the first opening portion  1321  and the second opening portion  1341  vertical to the vibration direction are circular, rectangular or triangular. In other embodiments, the cross-sectional shapes may also be other irregular shapes. A cross-sectional area of the first opening portion  1321  is greater than a cross-sectional area of the second opening portion  1341  (see  FIG. 2  and  FIG. 3  for details). The above description is for illustration only and is not to be construed as limiting the present disclosure. In other embodiments, the cross-sectional area of the first opening portion  1321  may be the same with the cross-sectional area of the second opening portion  1341 . By changing an opening position from the straight edge of the dome to the inner side of the straight edge, an influence on strength of the dome is avoided, and in addition, the mass of the dome  131  is effectively reduced through the opening portion at the inner side of the straight edge, and sensitivity of the product is improved. 
     Moreover, the dome  131  may alternatively have other shapes such as elliptical, polygonal, and the like. In the case that the folded ring  133  and the dome  131  are in a separate structure, the folded ring  133  is an annular hollow structure, such as a rectangular ring, a circular ring, an elliptical ring, and the like. The dome  131  is combined into a hollow portion of the folded ring  133 . It should be noted that the folded ring  133  and the dome  131  may alternatively be in an integrated structure. The number of the first opening portion  1321  and the second opening portion  1341  may be determined according to an actual size of the product. 
     Comparing the speaker in the present disclosure with existing technologies, the opening portion is arranged at the inner side of the straight edge of the dome rather than at the straight edge of the dome, so that an influence on strength of the dome is avoided and high-frequency characteristic of the product is not affected. In addition, the mass of the dome is effectively reduced by setting the opening portion, and the sensitivity of the product is improved. Further, a blank area from an inner edge of the folded ring of the diaphragm to an outer edge of the dome is reduced, reliability of the diaphragm is increased, and the diaphragm wrinkling is not easy to be caused when the product is vibrating and falling. 
     It should be noted that those ordinary skills in the art may make various modifications and changes without departing from the inventive concept of the present disclosure, and these modifications and changes shall all fall within a scope of protection of the present disclosure.