Abstract:
A high sound quality piezoelectric speaker includes a moving coil speaker, a support frame, a vibration plate, and a piezoelectric ceramic plate. The support frame is arranged on the moving coil speaker and the vibration plate is positioned on the support frame. With the piezoelectric ceramic plate being positioned on the vibration plate, the moving coil speaker and the piezoelectric ceramic plate may collaboratively and better handle both high-frequency and low-frequency sounds, exhibiting relatively wide playback band and making sound quality better, to thereby reach the standard of high sound quality and provide users with improved enjoyment of sound perception.

Description:
TECHNICAL FIELD OF THE INVENTION 
       [0001]    The present invention relates generally to the technical field of speakers, and more particularly to a high sound quality piezoelectric speaker. 
       DESCRIPTION OF THE PRIOR ART 
       [0002]    Moving coil speakers are one of the most commonly used speakers. A conventional moving coil speaker generally comprises a magnetic circuit portion and a vibration portion. The conventional moving coil speaker is structured such that a voice coil is suspended in a magnetic field generated by the magnetic circuit. When an audio frequency current is fed to the voice coil, the voice coil is excited by the magnetic field and thus generates vibration. The voice coil causes a vibration cup to drive air to generate vibration thereby generating sounds. 
         [0003]    However, due to factors including physical characteristics of the moving coil speaker itself and resonance of air in the speaker enclosure, the moving coil speaker responds differently to different frequencies of audio signal and has different frequency response curves for high frequency and low frequency and rapid deterioration occurs toward the higher frequencies and lower frequencies. Further, a large speaker is made up of a large vibration membrane, which is generally hard for high speed vibration and thus hard to generate a high frequency sound. Oppositely, a small speaker is generally incapable of driving a large amount of air existing in the speaker enclosure and is thus hard to generate a low frequency sound. In addition, materials and shapes of the coil and the vibration membrane may cause significant segregation of vibration in middle- and high-frequency bands, making it not possible for the speaker to exhibit a wide band of sound reproduction. This is a significant issue in the operation of a speaker. Thus, it is desired to provide improvement over the conventional moving coil speakers. 
       SUMMARY OF THE INVENTION 
       [0004]    In view of this, the present invention is made to overcome the shortcomings of the prior art and the primary object is to provide a high sound quality piezoelectric speaker, which effectively alleviates or overcomes the issue that the conventional moving coil speaker does not exhibit a wide sound playback band. 
         [0005]    To achieve the above object, the present invention the present invention adopts the following technical solution: 
         [0006]    A high sound quality piezoelectric speaker comprises a moving coil speaker, a support frame, a vibration plate, and a piezoelectric ceramic plate. The support frame is arranged on the moving coil speaker. The vibration plate is arranged on the support frame. The moving coil speaker has a sound emission direction in communication with the vibration plate. The piezoelectric ceramic plate is positioned on the vibration platen. 
         [0007]    The present invention shows significant advantages and beneficial effects over the prior art. Specifically, the following can be learned from the technical solution described above: 
         [0008]    A support frame can be arranged on an existing moving coil speaker to allow a vibration plate to be positioned on the support frame. With the piezoelectric ceramic plate being positioned on the vibration plate, the moving coil speaker and the piezoelectric ceramic plate may collaboratively and better handle both high-frequency and low-frequency sounds, exhibiting relatively wide playback band and making sound quality better, to thereby reach the standard of high sound quality and provide users with improved enjoyment of sound perception. 
         [0009]    The foregoing objectives and summary provide only a brief introduction to the present invention. To fully appreciate these and other objects of the present invention as well as the invention itself, all of which will become apparent to those skilled in the art, the following detailed description of the invention and the claims should be read in conjunction with the accompanying drawings. Throughout the specification and drawings identical reference numerals refer to identical or similar parts. 
         [0010]    Many other advantages and features of the present invention will become manifest to those versed in the art upon making reference to the detailed description and the accompanying sheets of drawings in which a preferred structural embodiment incorporating the principles of the present invention is shown by way of illustrative example. 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         [0011]      FIG. 1  is a perspective view showing a first preferred embodiment of the present invention in an assembled form. 
           [0012]      FIG. 2  is an exploded view of the first preferred embodiment of the present invention. 
           [0013]      FIG. 3  is a cross-sectional view of the first preferred embodiment of the present invention. 
           [0014]      FIG. 4  is a perspective view showing a second preferred embodiment of the present invention in an assembled form. 
           [0015]      FIG. 5  is a perspective view showing a third preferred embodiment of the present invention in an assembled form. 
           [0016]      FIG. 6  is an exploded view of the third preferred embodiment of the present invention. 
           [0017]      FIG. 7  is a cross-sectional view of the third preferred embodiment of the present invention. 
           [0018]      FIG. 8  is a perspective view showing a fourth preferred embodiment of the present invention in an assembled form. 
           [0019]      FIG. 9  is a perspective view showing a fifth preferred embodiment of the present invention in an assembled form. 
           [0020]      FIG. 10  is an exploded view of the fifth preferred embodiment of the present invention. 
           [0021]      FIG. 11  is a cross-sectional view of the fifth preferred embodiment of the present invention. 
           [0022]      FIG. 12  is a perspective view showing a sixth preferred embodiment of the present invention in an assembled form. 
           [0023]      FIG. 13  is a perspective view showing a seventh preferred embodiment of the present invention in an assembled form. 
           [0024]      FIG. 14  is an exploded view of the seventh preferred embodiment of the present invention. 
           [0025]      FIG. 15  is a cross-sectional view of the seventh preferred embodiment of the present invention. 
           [0026]      FIG. 16  is a perspective view showing an eighth preferred embodiment of the present invention in an assembled form. 
           [0027]      FIG. 17  is a perspective view showing a ninth preferred embodiment of the present invention in an assembled form. 
           [0028]      FIG. 18  is an exploded view of the ninth preferred embodiment of the present invention. 
           [0029]      FIG. 19  is a cross-sectional view of the ninth preferred embodiment of the present invention. 
           [0030]      FIG. 20  is a perspective view showing a tenth preferred embodiment of the present invention in an assembled form. 
           [0031]      FIG. 21  is a perspective view showing an eleventh preferred embodiment of the present invention in an assembled form. 
           [0032]      FIG. 22  is an exploded view of the eleventh preferred embodiment of the present invention. 
           [0033]      FIG. 23  is a cross-sectional view of the eleventh preferred embodiment of the present invention. 
       
    
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS 
       [0034]    The following descriptions are exemplary embodiments only, and are not intended to limit the scope, applicability or configuration of the invention in any way. Rather, the following description provides a convenient illustration for implementing exemplary embodiments of the invention. Various changes to the described embodiments may be made in the function and arrangement of the elements described without departing from the scope of the invention as set forth in the appended claims. 
         [0035]    Referring to  FIGS. 1-3 , a specific structure of a first preferred embodiment of the present invention is illustrated, comprising a moving coil speaker  10 , a support frame  20 , a vibration plate  30 , and a piezoelectric ceramic plate  40 . 
         [0036]    The support frame  20  is arranged on the moving coil speaker  10 . The vibration plate  30  is arranged on the support frame  20 . The moving coil speaker  10  defines a sound emission direction communicating with the vibration plate  30 . The piezoelectric ceramic plate  40  is arranged on the vibration plate  30 . In the instant embodiment, the support frame  20  is an annular frame. The annular frame comprises a receiving compartment  21  formed in one side thereof. The moving coil speaker  10  is received in the receiving compartment  21 . The moving coil speaker  10  has a protection cover  11  that comprises a plurality of second sound emission holes  101 . The plurality of second sound emission holes  101  is arranged to correspond exactly to the vibration plate  30 . The support frame  20  and the vibration plate  30  both have outline contours that are circular. The vibration plate  30  comprises a metallic material. And, the vibration plate  30  and the support frame  20  comprise a first gasket  50  interposed therebetween. The vibration plate  30  comprises a plurality of first sound emission holes  31  formed therein. The plurality of first sound emission holes  31  is arranged to distribute around a periphery of the piezoelectric ceramic plate  40 . Further, in the instant embodiment, the piezoelectric ceramic plate  40  is square or rectangular in shape and the piezoelectric ceramic plate  40  is arranged on a surface of the vibration plate  30 . 
         [0037]    To assemble, first, the moving coil speaker  10  is disposed in the receiving compartment  21 , and then, the first gasket  50  and the vibration plate  30  are sequentially disposed on the support frame  20  on the same side thereof and located exactly above and covering the moving coil speaker  10 , and afterwards, the piezoelectric ceramic plate  40  is disposed on a surface of the vibration plate  30 . 
         [0038]    Referring to  FIG. 4 , which illustrate a specific structure of a second preferred embodiment of the present invention, the structure of the instant embodiment is generally identical to the structure of the first embodiment and a difference is as follows: 
         [0039]    In the instant embodiment, the piezoelectric ceramic plate  40  is circular in shape. 
         [0040]    The assembling process of the instant embodiment is generally similar to the assembling process of the first embodiment and thus, no further detail regarding the assembly of the instant embodiment will be provided here. 
         [0041]    Referring to  FIG. 5-7 , which illustrate a specific structure of a third preferred embodiment of the present invention, the structure of the instant embodiment is generally identical to the structure of the first embodiment and differences are as follows: 
         [0042]    The support frame  20  is a ring-like body. The ring-like body is positioned on the protection cover  11  of the moving coil speaker  10  and the ring-like body and the protection cover  11  comprise a second gasket  60  interposed therebetween. The protection cover  11  comprises a plurality of third sound emission holes  102  formed therein and the plurality of third sound emission holes  102  is arranged to correspond exactly to the vibration plate  30 . 
         [0043]    To assemble, the second gasket  60  and the support frame  20  are sequentially disposed on the protection cover  11  of the moving coil speaker  10 , and then, the first gasket  50  and the vibration plate  30  are sequentially disposed on the support frame  20  the moving coil speaker  10 , and afterwards, the piezoelectric ceramic plate  40  is positioned on a surface of the vibration plate  30 . 
         [0044]    Referring to  FIG. 8 , which illustrates a specific structure of a fourth preferred embodiment of the present invention, the structure of the instant embodiment is generally identical to the structure of the third embodiment and a difference is as follows: 
         [0045]    In the instant embodiment, the piezoelectric ceramic plate  40  is circular in shape. 
         [0046]    The assembling process of the instant embodiment is generally similar to the assembling process of the third embodiment and thus, no further detail regarding the assembly of the instant embodiment will be provided here. 
         [0047]    Referring to  FIGS. 9-11 , which illustrate a specific structure of a fifth preferred embodiment of the present invention, the structure of the instant embodiment is generally identical to the structure of the first embodiment and differences are as follows: 
         [0048]    The support frame  20  is an annular frame. The annular frame comprises a receiving compartment  21  formed in one side thereof. The annular frame is provided therein with a sound emission channel  201 . The moving coil speaker  10  is received in the receiving compartment  21 . The moving coil speaker  10  comprises a protection cover  11  that is arranged opposite to the vibration plate  30 . The protection cover  11  has an outside surface on which a sealing board  12  is disposed. The moving coil speaker  10  comprises a frame  13  in which fourth sound emission holes  103  are formed. The sound emission channel  201  is arranged between and in communication with the fourth sound emission holes  103  and the vibration plate  30 . Further, the piezoelectric ceramic plate  40  is positioned on an undersurface of the vibration plate  30 . 
         [0049]    To assemble, first, the moving coil speaker  10  is disposed in the receiving compartment  21 , and then, the piezoelectric ceramic plate  40  is positioned on the undersurface of the vibration plate  30 , and afterwards, the first gasket  50  and the vibration plate  30  are sequentially disposed on the support frame  20  on the same side thereof and located exactly above and covering the moving coil speaker  10 . 
         [0050]    Referring to  FIG. 12 , which illustrates a specific structure of a sixth preferred embodiment of the present invention, the structure of the instant embodiment is generally identical to the structure of the fifth embodiment and a difference is as follows: 
         [0051]    In the instant embodiment, the piezoelectric ceramic plate  40  is circular in shape. 
         [0052]    The assembling process of the instant embodiment is generally similar to the assembling process of the fifth embodiment and thus, no further detail regarding the assembly of the instant embodiment will be provided here. 
         [0053]    Referring to  FIGS. 13-15 , which illustrate a specific structure of a seventh preferred embodiment of the present invention, the structure of the instant embodiment is generally identical to the structure of the first embodiment and differences are as follows: 
         [0054]    The support frame  20  comprises a closure cap  70  arranged on a bottom thereof. The support frame  20  comprises a mounting section  22  formed therein such that one side of the mounting section  22  and the vibration plate  30  define therebetween a first audio chamber  202 . An opposite side of the mounting section  22  and the closure cap  70  define therebetween a second audio chamber  203 . The mounting section  22  comprises sound guide holes  204  formed therein and the sound guide holes  204  are connected between and in communication with the first audio chamber  202  and the second audio chamber  203 . The moving coil speaker  10  is positioned on the mounting section  22  and located in the first audio chamber  202 . The moving coil speaker  10  comprises a protection cover  11  that comprises a plurality of fifth sound emission holes  104  formed therein. The plurality of fifth sound emission holes  104  is arranged to correspond exactly to and communicate with the second audio chamber  203 . Further, in the instant embodiment, the sound guide holes  204  are each of an arc-shaped through slot structure. And, the sound guide holes  204  are provided in plurality. The plurality of sound guide holes  204  is distributed, in a uniform manner, around a circumference of the moving coil speaker  10 . 
         [0055]    To assemble, first, the moving coil speaker  10  is disposed in the first audio chamber  202  and is mounted on the mounting section  22 . Afterwards, the closure cap  70  is disposed on the bottom of the support frame  20 . And then, the piezoelectric ceramic plate  40  is positioned on an undersurface of the vibration plate  30  and afterwards, the first gasket  50  and the vibration plate  30  are sequentially disposed on the support frame  20  on the same side thereof and located exactly above and covering the moving coil speaker  10 . 
         [0056]    Referring to  FIG. 16 , which illustrates a specific structure of an eighth preferred embodiment of the present invention, the structure of the instant embodiment is generally identical to the structure of the seventh embodiment and a difference is as follows: 
         [0057]    In the instant embodiment, the piezoelectric ceramic plate  40  is circular in shape. 
         [0058]    The assembling process of the instant embodiment is generally similar to the assembling process of the fifth embodiment and thus, no further detail regarding the assembly of the instant embodiment will be provided here. 
         [0059]    Referring to  FIGS. 17-19 , which illustrate a specific structure of a ninth preferred embodiment of the present invention, the structure of the instant embodiment is generally identical to the structure of the second embodiment and differences are as follows: 
         [0060]    In the instant embodiment, the vibration plate  30  is arranged on the support frame  20  in a suspended manner The vibration plate  30  and the support frame  20  define therebetween a sound emission gap  205 . Further, the vibration plate  30  has a circumference from which support legs  32  extend. The support legs  32  are inserted into and thus fixed on the support frame  20 . 
         [0061]    The assembling process of the instant embodiment is generally similar to the assembling process of the second embodiment and thus, no further detail regarding the assembly of the instant embodiment will be provided here. 
         [0062]    Referring to  FIG. 20 , which illustrates a specific structure of a tenth preferred embodiment of the present invention, the structure of the instant embodiment is generally identical to the structure of the ninth embodiment and a difference is as follows: 
         [0063]    In the instant embodiment, the piezoelectric ceramic plate  40  is square or rectangular in shape. 
         [0064]    The assembling process of the instant embodiment is generally similar to the assembling process of the ninth embodiment and thus, no further detail regarding the assembly of the instant embodiment will be provided here. 
         [0065]    Referring to  FIGS. 21-23 , which illustrate a specific structure of an eleventh preferred embodiment of the present invention, the structure of the instant embodiment is generally identical to the structure of the ninth embodiment and differences are as follows: 
         [0066]    In the instant embodiment, the vibration plate  30  comprises a sixth sound emission hole  33  formed therein. The piezoelectric ceramic plate  40  comprises a seventh sound emission hole  41  formed therein. The seventh sound emission hole  41  and the sixth sound emission hole  33  vertically correspond to each other and are in communication with each other. The seventh sound emission hole  41  is provided in singular form and is located in a central location of the piezoelectric ceramic plate  40 . 
         [0067]    The assembling process of the instant embodiment is generally similar to the assembling process of the ninth embodiment and thus, no further detail regarding the assembly of the instant embodiment will be provided here. 
         [0068]    It will be understood that each of the elements described above, or two or more together may also find a useful application in other types of methods differing from the type described above. 
         [0069]    While certain novel features of this invention have been shown and described and are pointed out in the annexed claim, it is not intended to be limited to the details above, since it will be understood that various omissions, modifications, substitutions and changes in the forms and details of the device illustrated and in its operation can be made by those skilled in the art without departing in any way from the claims of the present invention.