Moving coil sound head and moving coil microphone using same

Abstract

The utility model relates to the technical field of sound heads, and provides a moving-coil sound head and a moving-coil microphone applying the same, the moving-coil sound head comprises a front acoustic cavity, a moving-coil sound head sound-emitting body and a connecting device, the inner wall of the front acoustic cavity is provided with a first step and a second step which are in a circular truncated cone shape, and the first step is provided with a first opening; a second opening on the same side as the first opening is formed in the second step; the moving-coil voice head sounding body comprises a moving-coil voice head intermediate and a rear acoustic cavity, a piezoelectric ceramic piece is installed at the top of the moving-coil voice head intermediate, a connecting PCB is arranged at the bottom of the moving-coil voice head intermediate, the piezoelectric ceramic piece is matched with the first step, and the top of the moving-coil voice head intermediate is matched with the second step; the connecting device is laid close to the outer surface of the moving coil voice head intermediate, one end is connected with the PCB, the other end is connected with the piezoelectric ceramic piece, and the connecting device located on the outer surface of the piezoelectric ceramic piece is matched with the first opening and the second opening. According to the utility model, the frequency response range is wider, the sound is clearer and finer, the structure is simple, convenience and practicability are realized, and the sound quality effect is better.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of sound head, in particular to a moving coil sound head and a moving coil microphone applying the same. BACKGROUND

[0002] The frequency response range of the moving coil sound head on the market can only reach about 20Hz to 15KHz, and the clear and delicate high-frequency sound is difficult to be exhibited to achieve good sound effect, and the sound quality at higher frequency is difficult to be improved on the basis of the existing structure. CONTENT OF THE UTILITY MODEL

[0003] In order to help solve the above technical problems, the present application provides a moving coil sound head and a moving coil microphone applying the same.

[0004] In the first aspect, the present application provides a moving coil sound head, which adopts the following technical scheme:

[0005] A moving coil sound head, wherein the moving coil sound head comprises:

[0006] A front acoustic cavity, an inner wall of the front acoustic cavity is provided with a first step and a second step in the form of a circular truncated cone, a first opening is formed on the first step, a second opening is formed on the second step and is on the same side as the first opening, and an inner diameter of the first step is smaller than an inner diameter of the second step;

[0007] A moving coil sound head sound emitting body, the moving coil sound head sound emitting body comprises a moving coil sound head intermediate body and a rear acoustic cavity located at a bottom of the moving coil sound head sound emitting body, the moving coil sound head intermediate body is in a stepped structure, a piezoelectric ceramic sheet is mounted on a top of the moving coil sound head intermediate body, and a PCB board is connected at a bottom of the moving coil sound head intermediate body, the piezoelectric ceramic sheet is provided with a plurality of piezoelectric ceramic sound transmission holes and cooperates with the first step, and the top of the moving coil sound head intermediate body cooperates with the second step;

[0008] A connecting device, the connecting device is laid close to an outer surface of the moving coil sound head intermediate body, one end of the connecting device is connected to the connecting PCB board, and the other end of the connecting device is connected to the piezoelectric ceramic sheet, and the connecting device located on the outer surface of the piezoelectric ceramic sheet cooperates with the first opening and the second opening.

[0009] Preferably, the connecting device is a flexible circuit board, one end of the flexible circuit board is provided with a first pin and a second pin, the other end of the flexible circuit board is provided with a third pin and a fourth pin, the connecting PCB board is provided with a first connecting point and a second connecting point, the piezoelectric ceramic sheet is provided with a third connecting point and a fourth connecting point, and the first pin, the second pin, the third pin and the fourth pin are connected to the first connecting point, the second connecting point, the third connecting point and the fourth connecting point respectively.

[0010] Preferably, one side of the piezoelectric ceramic sheet is provided with an elastic resistance layer, which is bonded between the piezoelectric ceramic and the first step.

[0011] Preferably, the moving coil earphone intermediate body comprises, from top to bottom, a vibrating diaphragm, a coil, a pole piece, a magnet, a support and the connecting PCB.

[0012] In a second aspect, the application provides a moving coil microphone, which adopts the following technical solution:

[0013] A moving coil microphone, wherein the moving coil microphone applies the moving coil earphone according to any one of the first aspect.

[0014] In summary, the moving coil earphone of the application combines the piezoelectric ceramic with the moving coil earphone sound radiator, so that the moving coil earphone sound radiator can better exhibit powerful mid-low frequency sound, the piezoelectric ceramic can better exhibit clear and delicate high frequency sound, and the moving coil earphone has a wider frequency response range of 20Hz to 40KHz. Moreover, the patent embodiment improves the high frequency compensation performance of the moving coil earphone, and solves the problems of process and structural complexity. BRIEF DESCRIPTION OF DRAWINGS

[0015] In order to more clearly illustrate the technical solutions of the patent embodiments, the following will briefly introduce the drawings needed to be used in the embodiments. It should be understood that the following drawings only show some embodiments of the patent, and therefore should not be regarded as a limitation on the scope.

[0016] Figure 1 It is an exploded view of one embodiment of the moving coil earphone of the application;

[0017] Figure 2 It is a structural schematic view of the moving coil earphone intermediate body from the first perspective of the application;

[0018] Figure 3 It is a structural schematic view of the moving coil earphone intermediate body from the first perspective of the application;

[0019] Figure 4 It is a comparative frequency response curve diagram of the moving coil earphone of the application and a common moving coil earphone.

[0020] Reference signs: 100-front acoustic cavity; 101-first step; 102-second step; 103-first opening; 104-second opening; 105-piezoelectric ceramic sheet; 106-piezoelectric ceramic sound transmission hole; 107-vibration diaphragm; 108-coil; 109-pole piece; 110-magnet; 111-bracket; 112-connection PCB; 113-flexible circuit board; 114-rear acoustic cavity; 200-moving coil earphone sound radiator; 201-first connection point; 202-second connection point; 203-third connection point; 204-fourth connection point; 205-third pin; 206-fourth pin; 207-first pin; 208-second pin; 300-moving coil earphone. DETAILED DESCRIPTION

[0021] In order to make the objectives, technical solutions and advantages of the patent embodiments clearer, the technical solutions in the patent embodiments will be described clearly and completely below with reference to the drawings in the patent embodiments. Obviously, the described embodiments are part of the patent, rather than all the embodiments. The components of the patent embodiments described and shown in the drawings herein can be arranged and designed in various different configurations.

[0022] Therefore, the following detailed description of the embodiments of the patent provided in the drawings is not intended to limit the scope of the claimed patent, but only represents selected embodiments of the patent. Based on the embodiments in the patent, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the patent.

[0023] Figure 1 Figure 1 is an exploded view of an embodiment of a moving coil earphone of the present application, Figure 2 Figure 2 is a structural schematic view of a first perspective of an intermediate body of a moving coil earphone of the present application, Figure 3 Figure 2 is a structural schematic view of a first perspective of an intermediate body of a moving coil earphone of the present application, in combination with Figures 1 to 3 It can be understood that,

[0024] The moving coil earphone 300 of the present application can include a front acoustic cavity 100, a moving coil earphone sound producing body and a connecting device. The inner wall of the front acoustic cavity 100 is provided with a first step 101 and a second step 102 in the shape of a circular truncated cone, the first step 101 is provided with a first opening 103, the second step 102 is provided with a second opening 104 on the same side as the first opening 101, the inner diameter of the first step 101 is smaller than that of the second step 102; the moving coil earphone sound producing body 200 includes a moving coil earphone middle body and a rear acoustic cavity 114 at the bottom of the moving coil earphone sound producing body 200, the moving coil earphone middle body is in the shape of a step, the top of the moving coil earphone middle body is provided with a piezoelectric ceramic sheet 105, the bottom is provided with a PCB board 112, the piezoelectric ceramic sheet 105 is provided with a plurality of piezoelectric ceramic sound transmission holes 106 and cooperates with the first step 101, the top of the moving coil earphone middle body cooperates with the second step 102; the connecting device is laid close to the outer surface of the moving coil earphone middle body, one end is connected to the PCB board 112, and the other end is connected to the piezoelectric ceramic sheet 105, the connecting device on the outer surface of the piezoelectric ceramic sheet 105 cooperates with the first opening 101 and the second opening 102.

[0025] It should be noted that in this embodiment, the connecting device can be a flexible circuit board 113 or a wire. One end of the flexible circuit board 113 is provided with a first pin 207 and a second pin 208, the other end is provided with a third pin 205 and a fourth pin 206, the PCB board is provided with a first connecting point 201 and a second connecting point 202, the piezoelectric ceramic sheet 105 is provided with a third connecting point 203 and a fourth connecting point 204, the first pin 207, the second pin 208, the third pin 205 and the fourth pin 206 are connected to the first connecting point 201, the second connecting point 202, the third connecting point 203 and the fourth connecting point 204 respectively.

[0026] One side of the piezoelectric ceramic sheet 105 is provided with an elastic resistance layer, which is bonded between the piezoelectric ceramic and the first step. The moving coil earphone middle body includes, from top to bottom, a vibrating diaphragm 107, a coil 108, a pole piece 109, a magnet 110, a bracket 111 and a PCB board. The working principle of the moving coil earphone 300 is based on electromagnetic induction phenomenon to convert acoustic signals into electric signals. When the sound wave is transmitted to the vibrating diaphragm 107, the vibrating diaphragm 107 starts to vibrate, thereby driving the voice coil to move in the magnetic field. This movement causes the voice coil to cut the magnetic induction lines, thereby generating an induced current. The size and direction of this induced current will change with the change of the sound wave, and finally the acoustic signal is converted into an electric signal.

[0027] Specifically, the moving coil earphone 300 can include a moving coil earphone sound producing body 200, a piezoelectric ceramic sheet 105 and a front acoustic cavity 100, and the moving coil earphone sound producing body 200, the piezoelectric ceramic sheet 105 and the front acoustic cavity 100 are combined, and the flexible circuit board 113 is connected.

[0028] The front acoustic cavity 100 comprises a first step 101, a second step 102, a first opening 103 and a second opening 104, the first step 101 and the second step 102 are both circular truncated cone shapes, the diameter of the first step 101 is smaller than the diameter of the second step 102. The first step 101 and the second step 102 combine to form a resonance cavity, the piezoelectric ceramic sheet 105 is arranged in the first step 101, the moving coil earphone sound radiator 200 is arranged in the resonance cavity of the second step, the flexible circuit board 113 is arranged from the first opening 103 to the second opening 104 to connect the piezoelectric ceramic sheet 200 and the moving coil earphone. In the embodiment, the front acoustic cavity 100 is made of plastic or metal, which has the advantages of good adhesion, good stability, etc.

[0029] The moving coil earphone sound radiator 200 can only extend to the sound frequency of 20Hz to 15KHz, the high frequency extension of this frequency is not enough, and the moving coil earphone sound radiator 200 and the piezoelectric ceramic sheet 105 can be combined to extend the high frequency to 20Hz to 40KHz, which are independent and driven separately.

[0030] The piezoelectric ceramic sheet 105 is arranged in the first step 101 of the front acoustic cavity 100, the moving coil earphone sound radiator 200 is arranged in the resonance cavity of the second step 102 of the front acoustic cavity 100, the piezoelectric ceramic sheet 105 and the moving coil earphone sound radiator 200 are connected by the flexible circuit board 113, the flexible circuit board 113 is led out from the first opening 103 of the first step 101 and the second opening 104 of the second step 102 and connected to the moving coil earphone sound radiator 200 to connect the PCB board 112, so that the structure is simple and stable. The flexible circuit board 113 is a carrier for connecting the piezoelectric ceramic sheet 105 and the moving coil earphone sound radiator 200. The use of the flexible circuit board 113 ensures the quality of the moving coil earphone sound radiator 200, improves production efficiency, improves yield, and reduces cost.

[0031] The piezoelectric ceramic is made of ceramic sintering, and the piezoelectric ceramic is a kind of information functional ceramic material which can convert mechanical energy and electrical energy into each other. The piezoelectric effect, the piezoelectric ceramic has dielectricity, elasticity, etc. besides piezoelectricity, has been widely used in medical imaging, acoustic sensor, acoustic transducer, ultrasonic motor, etc.

[0032] The piezoelectric ceramic is made of ceramic sintering, and the piezoelectric ceramic is a kind of information functional ceramic material which can convert mechanical energy and electrical energy into each other. The piezoelectric effect, the piezoelectric ceramic has dielectricity, elasticity, etc. besides piezoelectricity, has been widely used in medical imaging, acoustic sensor, acoustic transducer, ultrasonic motor, etc.

[0033] Piezoelectric ceramics have sensitive characteristics, can convert extremely weak mechanical vibration into electrical signals, can be used in sonar system, weather detection, remote environmental protection, household appliances, etc. The deformation of piezoelectric ceramics under the action of electric field is very small, at most not more than one ten thousandth of its own size, and the precise control mechanism-piezoelectric driver based on this principle is a great blessing for the control of precision instruments and machinery, microelectronics technology, biological engineering and other fields. Resonator, filter and other frequency control devices are the key devices to determine the performance of communication equipment, and piezoelectric ceramics have obvious advantages in this regard. It has good frequency stability, high precision and wide frequency range, and small size, non-hygroscopic, long service life, especially in multi-channel communication equipment, it can improve the anti-interference performance.

[0034] The piezoelectric ceramic sheet 105 includes one or more piezoelectric ceramic sound transmission holes 106 for emitting sound from the moving coil earphone sound emitting body 200, which is beneficial to improve the sound quality. In the embodiment, the number of piezoelectric ceramic sound transmission holes 106 is 6, of course, in other specific embodiments, the number of piezoelectric ceramic sound transmission holes 106 can also be other, for example, 3, 10, etc.

[0035] The piezoelectric ceramic sheet 105 can be composed of a single layer of piezoelectric body, a multi-layer piezoelectric body, a single-sided piezoelectric body or a double-sided piezoelectric body. One side of the piezoelectric ceramic sheet 105 can also include an elastic resistance layer (not shown in the figure), which is bonded between the piezoelectric ceramic sheet 105 and the first step 101 of the front acoustic cavity 100. The piezoelectric ceramic sheet 105 and the moving coil earphone sound emitting body 200 are respectively installed in the first step 101 and the second step 102.

[0036] The flexible circuit board 113 includes four pins, two pins at one end of the flexible circuit board 113 are respectively connected with the connection PCB board 112. The other end of the flexible circuit board 113 includes a long pin 205 and a short pin 206, the long pin 205 and the short pin 206 are both connected with the piezoelectric ceramic sheet 105, the long pin 205 is connected with the third connection point 203 on the piezoelectric ceramic sheet 105, the short pin 206 is connected with the fourth connection point 204 on the piezoelectric ceramic sheet 105, the third connection point 203 is adjacent to the center of the piezoelectric ceramic sheet 105, the fourth connection point 204 is adjacent to the edge of the piezoelectric ceramic sheet 105, and the third connection point 203 and the fourth connection point 204 are both arranged in the first step 101 of the front acoustic cavity 100 where the piezoelectric ceramic sheet 105 is installed.

[0037] Figure 4 The figure is the comparison frequency response curve of the moving coil earphone of the present application and the ordinary moving coil earphone. Combined with the above description, the advantages of the moving coil earphone of the present application can be better understood. Figure 4It can be understood that after the piezoelectric ceramic sheet 105 is combined with the moving coil loudspeaker sound radiator 200, the moving coil loudspeaker sound radiator 200 can emit low-frequency (such as 20Hz to 15KHz) sound, and the piezoelectric ceramic sheet 105 can emit high-frequency (20Hz to 40KHz) sound, forming a complement, so that the moving coil loudspeaker of the patent can emit a wider frequency response and better display clear and delicate high-frequency sound. In addition, the piezoelectric ceramic sheet 105 and the moving coil loudspeaker sound radiator 200 can be connected to the connection PCB 103 through other wire connection methods in other specific embodiments, for example, through soft wire connection.

[0038] It should be noted that the patent combines the moving coil loudspeaker sound radiator 200 that can emit low-frequency and the piezoelectric ceramic sheet 105 that can emit high-frequency, which has a simple structure and can reduce the cumbersome process of adding extra high-frequency driving devices, thereby improving the sound quality effect.

[0039] The patent embodiment also provides a moving coil microphone that applies the moving coil loudspeaker 300 described above. The moving coil microphone can emit a wider frequency by setting the moving coil loudspeaker 300 of the patent embodiment, which has a simple structure, is convenient and practical, and has better sound quality.

[0040] It should be noted that similar reference numerals and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0041] In the description of the patent, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship when the patent product is usually placed, which is simplified for the convenience of describing the patent, and does not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation of the patent. In addition, the terms "first", "second", "third" and the like are only used to distinguish the description and cannot be understood as indicating or implying relative importance.

[0042] In addition, the terms "horizontal", "vertical", "overhanging" and the like do not mean that the components must be absolutely horizontal or overhanging, but can be slightly inclined. For example, "horizontal" only means that its direction is more horizontal relative to "vertical", and does not mean that the structure must be completely horizontal, but can be slightly inclined.

[0043] In the description of the present patent, it also needs to be explained that, unless otherwise explicitly specified and limited, the terms "set", "install", "connect", "connect" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium, it can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present patent can be understood according to the specific circumstances.

[0044] The above is only the preferred embodiment of the present patent and is not used to limit the present patent. For those skilled in the art, the present patent can have various changes and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present patent shall be included in the protection scope of the present patent. It should be noted that similar reference numerals and letters represent similar items in the following drawings, therefore, once an item is defined in one drawing, it does not need to be further defined and explained in the subsequent drawings.

[0045] The above is only the specific embodiment of the present patent, but the protection scope of the present patent is not limited thereto. Any person skilled in the art can easily think of changes or replacements within the technical range disclosed by the present patent, which shall be included in the protection scope of the present patent. Therefore, the protection scope of the present patent shall be subject to the protection scope of the claims.

Claims

1. A moving coil earphone, characterized in that, The moving coil earphone comprises: A front acoustic cavity, an inner wall of the front acoustic cavity is provided with a first step and a second step, the first step is provided with a first opening, the second step is provided with a second opening on the same side of the first opening, the inner diameter of the first step is smaller than the inner diameter of the second step; A moving coil earphone sound generator, the moving coil earphone sound generator comprises a moving coil earphone intermediate body and a rear acoustic cavity at the bottom of the moving coil earphone sound generator, the moving coil earphone intermediate body is a stepped structure, the moving coil earphone intermediate body is provided with a piezoelectric ceramic sheet at the top, and the bottom is connected with a PCB board, the piezoelectric ceramic sheet is provided with a plurality of piezoelectric ceramic sound transmission holes and cooperates with the first step, the top of the moving coil earphone intermediate body cooperates with the second step; A connecting device, the connecting device is laid close to the outer surface of the moving coil earphone intermediate body, one end of the connecting device is connected with the connecting PCB board, and the other end of the connecting device is connected with the piezoelectric ceramic sheet, the connecting device on the outer surface of the piezoelectric ceramic sheet cooperates with the first opening and the second opening.

2. The moving coil earphone of claim 1, wherein, The connecting device is a flexible circuit board, one end of the flexible circuit board is provided with a first pin and a second pin, the other end of the flexible circuit board is provided with a third pin and a fourth pin, the connecting PCB board is provided with a first connecting point and a second connecting point, the piezoelectric ceramic sheet is provided with a third connecting point and a fourth connecting point, the first pin, the second pin, the third pin and the fourth pin are connected with the first connecting point, the second connecting point, the third connecting point and the fourth connecting point respectively.

3. The moving coil earphone of claim 1, wherein, One side of the piezoelectric ceramic sheet is provided with an elastic resistance layer, the elastic resistance layer is bonded between the piezoelectric ceramic and the first step.

4. The moving coil earphone of claim 1, wherein, The moving coil earphone intermediate body comprises, in sequence from top to bottom, a vibrating diaphragm, a coil, a pole piece, a magnet, a support and the connecting PCB board.

5. A moving-coil microphone, characterized by The moving coil earphone applies the moving coil earphone as claimed in any one of claims 1 to 4.

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