Patent Publication Number: US-11032635-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 a higher requirement of consumers for product performance and to present essence of sounds 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 an 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 in a middle portion of a straight edge of the dome. Because the middle portion of the dome is prone to split vibration due to insufficient strength when the dome is vibrating at a high frequency, cutting holes in the middle portion of the straight edge of the dome is bound to severely reduce a strength of the dome and affect high-frequency characteristic of the product. Especially for a product with a large aspect ratio, if a size of the hole cut in the middle portion of the straight edge of the dome is too large, the strength of the middle portion of the dome will be seriously affected; if the size of the hole is too small, the mass of the dome cannot be well reduced preferably. 
     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 partial structure view of a diaphragm in the speaker according to the present disclosure; 
         FIG. 3  is a plan view of a dome in the speaker according to the present disclosure; and 
         FIG. 4  is a perspective 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. 
     For a product with a large aspect ratio, 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 a 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 a rectangle, and the dome  131  is a rectangle with rounded corners. The folded ring  133  is an annular hollow structure, and the dome  131  is combined into a hollow portion of the folded ring  133 . Matching with a shape of the diaphragm  13 , the dome  131  generally has a rectangular structure, taking a direction along a long edge of the diaphragm  13  as a length side and a direction along a short edge of the diaphragm  13  as a short side. Obviously, referring to  FIG. 2 , the dome  131  in this embodiment includes first side edges  132  arranged oppositely and second side edges  134  connected with the first side edges  132  and arranged oppositely. Corners of the dome, for example, are chamfered structures. It should be noted that the folded ring  133  and the dome  131  may alternatively be an integrated structure. Further, as shown in  FIG. 3  and  FIG. 4 , the dome  131  has a large aspect ratio. In order to avoid strength reduction and split vibration caused by forming a large-sized opening on a long edge of the dome  131  in existing technologies, the following improvements will be made in the present disclosure: the dome  131  includes two or more opening portions disposed separately along the first side edge  132  or the second side edge  134 , and an extended portion is arranged between two adjacent opening portions. In this embodiment, the dome  131  includes two first side edges  132  on the upper side and lower side in  FIG. 2  and two second side edges  134  on the left side and right side in  FIG. 2 . A length of the first side edge  132  is greater than that of the second side edge  134 . Each first side edge  132  includes a first opening portion  1322  and a second opening portion  1323  disposed separately from each other, and a first extended portion  1321  is arranged between the first opening portion  1322  and the second opening portion  1323 . The first extended portions  1321  on the two first side edges  132  are axisymmetric along an axis parallel to the second side edge. 
     Preferably, the first opening portion  1322  and the second opening portion  1323  are symmetrically arranged on two sides of the first extended portion  1321 . The first opening portion  1322  and the second opening portion  1323  have the same cross-sectional shape and the same cross-sectional area. An opening width D of the first opening portion  1322  and the second opening portion  1323  gradually decreases along an opening depth H. Alternatively, the first opening portion  1322  and the second opening portion  1323  may be different. For example, the opening width D of the first opening portion  1322  is an equal opening width, while the opening width D of the second opening portion  1323  gradually decreases along the opening depth H. Please refer to  FIG. 3  and  FIG. 4  for details. Since the two first side edges  132  have the same structure, the first side edge  132  on the upper side in  FIG. 2  will be taken as an example for description, and the description of the other first side edge  132  is omitted. In other embodiments, the second side edge  134  may also include a third opening portion and a fourth opening portion disposed separately from each other, and a second extended portion arranged between the third opening portion and the fourth opening portion. The second extended portions are axisymmetric along an axis parallel to the first side edge  132 . The present disclosure is not limited thereto, and the above is only used for illustration. The present disclosure may alternatively have other embodiments as long as a structural strength of a middle portion of the dome  131  is ensured. 
     Moreover, the dome  131  may alternatively have other shapes such as elliptical, polygonal, and the like. The folded ring  133  is a hollow annular structure, such as a rectangular ring, a circular ring, an elliptical ring, and the like. The folded ring  133  includes a dome portion  1331  located in the middle, a folded ring portion  1332  surrounding the dome portion  1331 , and a fixing portion  1333  surrounding the folded ring portion  1332  and fixed to the basket  11 . The dome  131  is fixed to the dome portion  1331 , and a projection of the dome  131  along a vibration direction is in a projection range of the dome portion  1331  along the vibration direction. 
     Therefore, two or more opening portions are disposed separately along the first side edge  132  or the second side edge  134  of the dome  131 , and an extended portion is arranged between two adjacent opening portions. The structure above ensures a strength of the middle portion of the dome  131 , so that high-frequency characteristic of the product is not affected. In addition, mass of the dome  131  is effectively reduced by setting the opening portions at the two sides, and sensitivity of the product is improved. 
     Comparing the speaker in the present disclosure with existing technologies, the opening portions are arranged at two sides of the middle portion of the long edge of the dome, so that an influence on the strength of the middle portion of the dome is avoided, and the high-frequency characteristic of the product is not affected. In addition, the mass of the dome is effectively reduced by setting the opening portions, and sensitivity of the product is improved. 
     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 the scope of protection of the present disclosure.