Patent Publication Number: US-2022240021-A1

Title: Multi-input-driving loudspeaker

Description:
CROSS REFERENCE TO RELATED APPLICATION(S) 
     This application claims priority from Chinese Patent Application CN 201920932934.7 filed on Jun. 20, 2019, which is incorporated herein by reference in its entirety. 
     TECHNICAL FIELD 
     The present disclosure relates to the loudspeaker field, in particular to a multi-input-driving loudspeaker. 
     BACKGROUND 
     Existing loudspeakers generally adopt a structure comprising a conical diaphragm (made of paper, PP and other materials) combined with a damper, the middle of the conical diaphragm and the damper is respectively provided with a central hole, the damper is arranged below the conical diaphragm, a single signal input voice coil passes through the center holes of the damper and the conical diaphragm, and the conical diaphragm and the damper are glued on the voice coil respectively to form a loudspeaker vibration system. This kind of loudspeaker can only be used for single signal input and has limitations on the reproduction of the original sound. 
     Therefore, one of the current improvements is to adopt a structure comprising: a conical diaphragm combined with a damper with a central hole in the middle thereof diaphragm respectively, the damper is arranged under the conical diaphragm, and the voice coil is changed from the single signal input mode to a multiple signal input mode and passes through the center holes of the damper and the conical diaphragm, wherein the voice coil is formed by stacking multiple sets of coils from the inside to the outside, and the conical diaphragm and the damper are glued on the outer wall of the voice coil respectively to form a loudspeaker vibration system. This kind of loudspeaker can be used for multiple signal input. However, since this type of loudspeaker has multiple sets of coils wound on one voice coil, winding multiple sets of coils on one voice coil increases the weight of the voice coil, and when the voice coil drives the diaphragm, the sensitivity of the loudspeaker will be lost. 
     SUMMARY 
     In view of the above-mentioned problems, the present disclosure provides a multi-input-driving loudspeaker, which reduces the distortion of a loudspeaker and also improves the sensitivity and the intelligiblity of the loudspeaker. 
     To achieve the above purpose, the technical solution employed by the present disclosure is: 
     a multi-input-driving loudspeaker comprises a frame, and a diaphragm arranged on the frame, and the loudspeaker further comprises a plurality of input driving mechanisms, each input driving mechanism comprises a voice coil and a magnetic circuit assembly for driving the voice coil to vibrate; 
     a plurality of magnetic circuit mounting holes are arranged on the frame, and at most one magnetic circuit assembly is arranged at each magnetic circuit mounting hole; 
     a plurality of voice coil mounting holes are arranged on the diaphragm, and at most one voice coil is provided at each voice coil mounting hole. 
     Herein, “multi-input” refers to multiple audio signal inputs, “multi-input driving” refers to multiple audio signals input to multiple voice coils, and the multiple voice coils jointly drive the loudspeaker to produce sound. 
     In an embodiment, there are three or more input driving mechanisms, and the three or more input driving mechanisms are arranged at equal intervals along a circumference. 
     In an embodiment, the diaphragm has a diaphragm bottom that is circular as a whole and shaped as a flat plate, and a center of the circumference coincides with a center of the diaphragm bottom. 
     In an embodiment, three or more voice coil mounting holes are arranged on the diaphragm bottom, the three or more voice coil mounting holes are arranged at equal intervals along the circumference, each of the voice coil mounting holes is provided with one voice coil so that the voice coil is connected with the diaphragm bottom. 
     In an embodiment, the diaphragm further comprises a tapered edge portion extending obliquely upwards from an outer edge of the diaphragm bottom, and the tapered edge portion is fixedly connected to the frame through a yoke ring. 
     In an embodiment, the frame is provided with three or more magnetic circuit mounting holes, the three or more magnetic circuit mounting holes are arranged at equal intervals along the circumference, each of the magnetic circuit mounting holes is provided with one magnetic circuit assembly. 
     In an embodiment, each of the input driving mechanisms further comprises a damper, and each of the voice coils is sleeved with one of the dampers. 
     In an embodiment, the frame has a plurality of flanges surrounding the magnetic circuit mounting holes, and each of the dampers and each of the flanges cooperate with each other so that each damper is embedded between an inner wall of the flange corresponding therewith. 
     In an embodiment, each of the input driving mechanisms further comprises a dust cover, and each of the voice coil mounting holes is covered with one of the dust cover. 
     In an embodiment, each magnetic circuit assembly comprises a U-yoke having an inner cavity, a magnetic steel and a magnetic pole core arranged within the U-yoke, a magnetic gap is formed between the magnetic steel and the magnetic pole core and an inner wall of the U-yoke, the voice coil is inserted in the magnetic gap and capable of moving in an up-and-down direction, and an upper edge of the U-yoke is fixedly connected to the magnetic circuit mounting hole of the frame. 
     In an embodiment, the frame is provided with multiple pairs of audio signal input terminals, each pair of audio signal input terminals is electrically connected to leads of one voice coil. 
     In an embodiment, a plurality of reinforcing ribs are arranged on the diaphragm. 
     In an embodiment, the plurality of input driving mechanisms is arranged along a circle, a straight line, or an array. 
     In an embodiment, the loudspeaker further comprises three or more input-driving mechanisms, the three or more input driving mechanisms are arranged at equal intervals along a circumference, the diaphragm has a diaphragm bottom that is circular as a whole and shaped as a flat plate, a center of the circumference coincides with a center of the diaphragm bottom, the diaphragm bottom is provided with three or more voice coil mounting holes, center lines of the voice coil mounting holes pass through the circumference, each of the voice coil mounting holes is provided with one voice coil so that the voice coil is connected with the diaphragm bottom, each of the input driving mechanisms further comprises a damper, each of the voice coils is sleeved with one of the damper, the frame is provided with a plurality of flanges surrounding the magnetic circuit mounting holes, and each of the dampers and each of the flanges cooperate with each other so that each damper is embedded between an inner wall of the flange corresponding therewith. 
     Due to the use of the above technical solutions, the present disclosure has the following advantages over the prior art: 
     in the multi-input-driving loudspeaker of the present disclosure, the structure is ingenious and rational, and the original sound reproduction and distortion are better than that of traditional loudspeakers by receiving audio signal input via multiple voice coils; by the input-driving structure formed by a plurality of voice coils and a plurality of magnetic circuit assemblies, the sensitivity of the loudspeaker is increased, and the intelligiblity of the loudspeaker is improved. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       For more clearly explaining the technical solutions in the embodiments of the present disclosure, the accompanying drawings used to describe the embodiments are simply introduced in the following. Apparently, the below described drawings merely show a part of the embodiments of the present disclosure, and those skilled in the art can obtain other drawings according to the accompanying drawings without creative work. 
         FIG. 1  is a schematic structure diagram of a loudspeaker according to an embodiment; 
         FIG. 2  is a schematic diagram of the frame in  FIG. 1  after the magnetic circuit assemblies are mounted; 
         FIG. 3  is a schematic diagram of the frame in  FIG. 1  after the magnetic circuit assemblies, the voice coils and the dampers are mounted; 
         FIG. 4  is a schematic diagram of the frame and the diaphragm after the voice coils are mounted in  FIG. 1 ; 
     
    
    
     wherein, 
       1 —frame;  10 —magnetic circuit mounting hole;  11 —flange;  2 —diaphragm;  20 —voice coil mounting hole;  21 —diaphragm bottom;  22 —tapered edge portion;  23 —reinforcing rib;  3 —input drive mechanism;  31 —dust cover;  32 —voice coil;  320 —lead;  33 —damper;  34 —secondary neodymium magnetic steel;  35 —magnetic pole core;  36 —main neodymium magnetic steel;  37 —U-yoke;  4 —yoke ring;  5 —audio signal input terminal. 
     DETAILED DESCRIPTION OF EXEMPLARY EMBODIMENTS 
     In the following, the preferable embodiments of the present disclosure are explained in detail combining with the accompanying drawings so that the advantages and features of the present disclosure can be easily understood by the skilled persons in the art. It should be noted that the explanation on these implementations is to help understanding of the present disclosure, and is not intended to limit the present disclosure. 
     This embodiment provides a multi-input-driving loudspeaker, herein, “multi-input” refers to multiple audio signal inputs, multiple audio signals are input to multiple voice coils, and the multiple voice coils jointly drive the loudspeaker to produce sound. Referring to  FIG. 1  to  FIG. 4 , the multi-input-driving loudspeaker comprises a frame  1 , a diaphragm  2 , and a plurality of input driving mechanisms  3 . The diaphragm  2  is used to vibrate to produce sound, and is fixed arranged on the frame  1 . Each input driving mechanism  3  comprises a voice coil  32  and a magnetic circuit assembly for driving the voice coil  32  to vibrate; wherein, the frame  1  is provided with a plurality of magnetic circuit mounting holes  10 , and at most one magnetic circuit assembly is arranged at each magnetic circuit mounting hole  10 ; the diaphragm  2  is provided with a plurality of voice coil mounting holes  20 , and at most one voice coil  32  is provided at each voice coil mounting hole  20 . That is, the plurality of input-driving mechanisms is mounted on the frame  1  and the diaphragm  2 . There are three or more input driving mechanisms  3  to increase the driving energy of the loudspeaker, and the three or more input driving mechanisms  3  are arranged at equal intervals along a circumference. The diaphragm has a diaphragm bottom  21  that is circular as a whole and shaped as a flat plate, and the center of the circumference coincides with the center of the diaphragm bottom  21 , that is, the plurality of input driving mechanisms  3  is arranged at equal intervals along the circumference of the diaphragm bottom  21 . Correspondingly, the diaphragm bottom  21  is provided with three or more voice coil mounting holes  20 , the center lines of the voice coil mounting holes  20  pass through the circumference, and each of the voice coil mounting holes  20  is provided with one voice coil  32  so that the voice coil  32  is connected with the diaphragm bottom  21 ; the frame  1  is provided with three or more magnetic circuit mounting holes  10 , the magnetic circuit mounting holes  10  are arranged at equal intervals along the circumference, and each of the magnetic circuit mounting holes  10  is provided with one magnetic circuit assembly. Specifically, as shown in  FIGS. 1-4 , the number of the input driving mechanisms  3 , the voice coil mounting holes  20  and the magnetic circuit mounting holes  10  are all four, and they are arranged in a ring around the center of the diaphragm bottom  21 . 
     In this embodiment, the frame  1  is made of plastic using processes such as injection molding, which is easy to form and has a certain strength, and the magnetic circuit mounting holes  10  are through holes that penetrate the frame  1  from top to bottom. The diaphragm  2  further comprises a tapered edge portion  22  extending obliquely upwards from the outer edge of the diaphragm bottom  21 , and the tapered edge portion  22  is arranged in a circle around the diaphragm bottom  21 . The diaphragm  2  is made of paper pulp, PP (polypropylene), ballistic fiber or aluminum alloy, and the made diaphragm  2  is light in weight, has good damping elasticity and rigidity, high temperature and low temperature resistance, waterproof and mildew proof. In addition, the tapered edge portion  22  of the diaphragm  2  is fixedly connected to the frame  1  through a yoke ring  4 , which is made of sponge, rubber, or cloth. With the diaphragm  2  with the above-mentioned shape, the directional expansion width is superior to that of the traditional conical loudspeaker, and the height is lower than that of the traditional conical diaphragm  2 , which is beneficial to reducing the overall height of the loudspeaker. 
     Each input-driving mechanism  3  also comprises a dust cover  31  and a damper  33  respectively. The specific mechanism of the input-driving mechanisms  3  will be described in detail below. As shown in  FIG. 1 , each input-driving mechanism  3  is consisted of a dust cover  31 , a voice coil  32 , a damper  33 , a secondary neodymium magnetic steel  34 , a magnetic pole core  35 , a main neodymium magnetic steel  36 , and a U-yoke  37 . In each of the input-driving mechanism  3 , the dust cover  31  is fixedly connected to the diaphragm  2 , each voice coil mounting hole  20  is covered with one dust cover  31 , and the voice coil  32  is covered under the dust cover  21 . The upper end portion of the voice coil  32  is inserted into and close fit with the voice coil mounting hole  20  of the diaphragm  2 , and the voice coil  32  is connected to the diaphragm  2  to drive the diaphragm  2  to vibrate. The damper  33  is provided with a through hole in the middle so as to be sleeved on the voice coil  32 , the outer periphery of the voice coil is tightly connected with the through hole, and with the restriction of the damper  33 , the voice coil can only move up and down, and cannot produce movement in the horizontal direction; the damper  33  is specifically located in a cavity formed between the frame  1  and the diaphragm  2  after they are connected, the upper surface of the frame  1  has a plurality of upwardly extending flanges  11  surrounding the magnetic circuit mounting holes  10 , each of the magnetic circuit mounting holes  10  is surrounded by one flange  11 , and each damper  33  and each flange  11  cooperate with each other so that they are fitted closely, so that the damper  33  can be embedded between the inner wall of the flange  11  (as shown in  FIG. 3 ), to prevent the damper  33  from shaking. The U-yoke  37  has an inner cavity and an open upper end, the upper edge of the U-yoke is fixedly connected at the magnetic circuit mounting hole  10  (such as the hole wall of the magnetic circuit mounting hole  10 , or the lower surface of the frame  1  close to the magnetic circuit mounting hole  10 ), and the magnetic circuit mounting hole  10  is in communication with the inner cavity of the U-yoke  37 ; the secondary neodymium magnetic steel  34 , the magnetic pole core  35 , and the main neodymium magnetic steel  36  are stacked from top to bottom, and are fixedly arranged in the inner cavity of the U-yoke  37 , to form a magnetic circuit assembly; the lower surface of the secondary neodymium magnetic steel  34  is closely attached to the upper surface of the magnetic pole core  35 , and the lower surface of the magnetic pole core  35  is closely attached to the upper surface of the main neodymium magnetic steel  36 ; there are a gap between the secondary neodymium magnetic steel  34 , the magnetic pole the core  35  and the main neodymium magnetic steel  36  and the inner wall of the U-yoke  37 , thereby forming a magnetic gap surrounding the secondary neodymium magnetic steel  34 , the magnetic pole core  35  and the main neodymium magnetic steel  36 , the lower end of the voice coil  32  is inserted into the magnetic gap downward from the magnetic circuit mounting hole  10 , there is a gap between the voice coil  32  and the secondary neodymium magnetic steel  34 , the magnetic pole core  35  and the main neodymium magnet  36 , and there is also a gap between it and the inner wall of the U-yoke  37 , so that it can move up and down in the magnetic gap. 
     As shown in  FIG. 2  and  FIG. 3 , the frame  1  is provided with multiple pairs of audio signal input terminals  5 , each pair of audio signal input terminals  5  is electrically connected to a lead of one voice coil  32 . Wherein, each pair of audio signal input terminals  5  comprises a positive terminal and a negative terminal, one lead of each voice coil  32  is electrically connected to the positive terminal of one pair of audio signal input terminals  5 , and another lead is electrically connected to the negative terminal of this pair of audio signal input terminals  5 , to receive the audio signal (analog signal or digital signal) input from the pair of audio signal input terminal  5 . Thus, four voice coils  32  are simultaneously driven through the four pairs of audio signal input terminals  5 . By providing multiple integrated terminals for audio signal input in the frame  1 , the positive and negative leads of each voice coil  32  can be connected to the intermediate terminals at the bottom of the frame  1 , and this connection method simplifies the manufacture of multi-input-driving loudspeakers, and is also convenient for the connection of audio signal input. 
     As shown in  FIG. 4 , a plurality of reinforcing ribs  23  are arranged on the diaphragm  2 , which can increase the working strength of the diaphragm  2 . Specifically, as shown in  FIG. 4 , a plurality of reinforcing ribs  23  are arranged at equal intervals along the circumferential direction of the diaphragm  2 , and each reinforcing rib  23  extends along the radial direction of the diaphragm  2 . The ribs  23  are located between the voice coil mounting holes  20 . 
     The working principle of the multi-input-driving loudspeaker is: the audio signal is input to the plurality of voice coils  32  through the audio signal input terminals  5  on the frame  1 , and the plurality of voice coils  32  move up and down synchronously under the action of the magnetic circuit assemblies, thereby driving the diaphragm  2  to vibrate to produce sound. The multi-input-driving loudspeaker of the present disclosure adopts a diaphragm  2  with a flat plate shaped bottom, three or more voice coil mounting holes  20  are provided on the plane formed by the diaphragm bottom  21 , and tightly fitted with three or more voice coils  32 , and then the voice coils  32  are tightly fitted with three or more dampers  33  to form three or more input-driving mechanisms  3 , and by using three or more magnetic circuit assemblies to drive the voice coils  32 , and three or more voice coils  32  to drive the voice diaphragm  2 , it can not only reduce the height of the product, but also broaden the directivity of the product, and through multiple audio signal inputs, it can reduce the distortion of the product, increase the sensitivity of the loudspeakers, and improve the intelligiblity of the loudspeaker. The use of integrated terminals simplifies the connection of the product and facilitates the connection of audio signal input. 
     The loudspeaker structure is ingenious and rational, and through the use of a flat-bottom conical diaphragm structure, the flat-bottom conical diaphragm has a better directivity than traditional loudspeakers; by receiving the audio signal input via three or more voice coils, the original sound reproduction and distortion are better than that of traditional loudspeakers; by adopting a diaphragm with a flat-bottom, the height of the diaphragm is lower than that of the traditional conical diaphragm, and the reduction of the height of the diaphragm can also reduce the height of the product; by using an input-driving structure composed of three or more voice coils and three or more magnetic circuit assemblies, the sensitivity of the loudspeaker is increased; by closely connecting the flat-bottom conical diaphragm with three or more voice coils, the three or more voice coils are driven through three or more audio signal inputs to move up and down in the U-yoke magnetic circuit to drive the diaphragm to sound. 
     The embodiments described above are only for illustrating the technical concepts and features of the present disclosure, are preferred embodiments, and are intended to make those skilled in the art being able to understand the present disclosure and thereby implement it, and should not be concluded to limit the protective scope of this disclosure.