Moving coil sound head and moving coil microphone using same

Abstract

The invention 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 heads, and in particular to a dynamic sound head and a dynamic microphone using the same. Background Art

[0002] The frequency response range of dynamic sound capsules currently on the market can only reach about 20Hz to 15KHz. The clarity and delicacy of high-frequency sounds are difficult to display to achieve good sound effects, and the sound quality at higher frequencies is difficult to improve on the existing infrastructure. Summary of the invention

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

[0004] In the first aspect, the present application provides a dynamic sound head, which adopts the following technical solution: A dynamic coil sound head, wherein the dynamic coil sound head comprises: A front acoustic cavity, wherein the inner wall of the front acoustic cavity is provided with a first step and a second step in a truncated cone shape, the first step is provided with a first opening, the second step is provided with a second opening on the same side as the first opening, and the inner diameter of the first step is smaller than the inner diameter of the second step; A dynamic sound head sound body, the dynamic sound head sound body comprises a dynamic sound head intermediate body and a rear acoustic cavity located at the bottom of the dynamic sound head sound body, the dynamic sound head intermediate body is a step structure, a piezoelectric ceramic sheet is installed on the top of the dynamic sound head intermediate body, and a PCB board is connected at the bottom, the piezoelectric ceramic sheet is provided with a plurality of piezoelectric ceramic sound-permeable holes and cooperates with the first step, and the top of the dynamic sound head intermediate body cooperates with the second step; A connecting device is laid close to the outer surface of the intermediate body of the dynamic sound head, one end of which is connected to the connecting PCB board, and the other end is connected to the piezoelectric ceramic sheet. The connecting device located on the outer surface of the piezoelectric ceramic sheet cooperates with the first opening and the second opening.

[0005] Preferably, the connecting device is a flexible circuit board, a first pin and a second pin are provided at one end of the flexible circuit board, and a third pin and a fourth pin are provided at the other end, a first connection point and a second connection point are provided on the connecting PCB board, a third connection point and a fourth connection point are provided on the piezoelectric ceramic sheet, and the first pin, the second pin, the third pin and the fourth pin are respectively connected to the first connection point, the second connection point, the third connection point and the fourth connection point.

[0006] Preferably, an elastic resistance layer is provided on one side of the piezoelectric ceramic sheet, and the elastic resistance layer is bonded between the piezoelectric ceramic and the first step.

[0007] Preferably, the dynamic sound head intermediate body comprises a vibration membrane, a coil, a pole piece, a magnet, a bracket and the connecting PCB board from top to bottom.

[0008] In a second aspect, the present application provides a dynamic microphone, which adopts the following technical solution: A dynamic microphone, wherein the dynamic microphone uses the dynamic sound capsule described in any one of the first aspects above.

[0009] In summary, the dynamic sound head of the present application combines piezoelectric ceramics with the sound body of the dynamic sound head, so that the sound body of the dynamic sound head can better display the rich and powerful mid-low frequency sound, and the piezoelectric ceramics can better display the clear and delicate high-frequency sound, forming a complementary relationship, so that the frequency response range of the dynamic sound head is wider and can reach 20Hz to 40KHz. In addition, the embodiment of this patent improves the high-frequency compensation performance of the dynamic sound head while solving the problems of process and structural complexity. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] In order to more clearly illustrate the technical solutions of the patent embodiments, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of this patent and therefore should not be regarded as limiting the scope.

[0011] Figure 1 An exploded view of an embodiment of a dynamic sound head of the present application; Figure 2 This is a schematic structural diagram of the first perspective of the intermediate body of the dynamic sound head of the present application; Figure 3 This is a schematic structural diagram of the first perspective of the intermediate body of the dynamic sound head of the present application; Figure 4 This is a comparative frequency response curve diagram of the dynamic sound head of this application and the ordinary dynamic sound head.

[0012] Figure markings: 100-front acoustic cavity; 101-first step; 102-second step; 103-first opening; 104-second opening; 105-piezoelectric ceramic sheet; 106-piezoelectric ceramic sound-permeable hole; 107-vibration membrane; 108-coil; 109-pole piece; 110-magnet; 111-bracket; 112-connecting PCB board; 113-flexible circuit board; 114-rear acoustic cavity; 200-dynamic sound head sound body; 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-dynamic sound head. DETAILED DESCRIPTION

[0013] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be described clearly and completely in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of them. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0014] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the present invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0015] Figure 1 This is an exploded view of an embodiment of a dynamic sound head of the present application. Figure 2 The first perspective structural diagram of the dynamic sound head intermediate of the present application, Figure 3 This is a structural diagram of the first perspective of the intermediate body of the dynamic sound head of the present application, combined with Figures 1 to 3 Understandably, The dynamic sound head 300 of the present application may include a front acoustic cavity 100, a dynamic sound head sound body and a connecting device. The inner wall of the front acoustic cavity 100 is provided with a truncated cone-shaped first step 101 and a second step 102, 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, and the inner diameter of the first step 101 is smaller than the inner diameter of the second step 102; the dynamic sound head sound body 200 includes a dynamic sound head middle body and a rear acoustic cavity 114 located at the bottom of the dynamic sound head sound body 200, the dynamic sound head middle body is a step structure, and the dynamic sound head middle body is a step structure. A piezoelectric ceramic sheet 105 is installed on the top of the body, and the bottom is connected to a PCB board 112. The piezoelectric ceramic sheet 105 is provided with a number of piezoelectric ceramic sound-permeable holes 106 and cooperates with the first step 101, and the top of the dynamic sound head intermediate body cooperates with the second step 102; the connecting device is laid close to the outer surface of the dynamic sound head intermediate, one end is connected to the PCB board 112, and the other end is connected to the piezoelectric ceramic sheet 105, and the connecting device located on the outer surface of the piezoelectric ceramic sheet 105 cooperates with the first opening 101 and the second opening 102.

[0016] It should be noted that, in this embodiment, the connection device can be a flexible circuit board 113 or a wire. A first pin 207 and a second pin 208 are provided at one end of the flexible circuit board 113, and a third pin 205 and a fourth pin 206 are provided at the other end. A first connection point 201 and a second connection point 202 are provided on the connection PCB board, and a third connection point 203 and a fourth connection point 204 are provided on the piezoelectric ceramic sheet 105. The first pin 207, the second pin 208, the third pin 205 and the fourth pin 206 are connected to the first connection point 201, the second connection point 202, the third connection point 203 and the fourth connection point 204, respectively.

[0017] An elastic resistance layer is provided on one side of the piezoelectric ceramic sheet 105, and the elastic resistance layer is bonded between the piezoelectric ceramic and the first step. The intermediate body of the dynamic coil sound head includes a vibration membrane 107, a coil 108, a pole piece 109, a magnet 110, a bracket 111 and a connecting PCB board from top to bottom. The working principle of the dynamic coil sound head 300 is based on the electromagnetic induction phenomenon to convert the sound signal into an electrical signal. When the sound wave is transmitted to the vibration membrane 107, the vibration membrane 107 begins to vibrate, thereby driving the voice coil to move in the magnetic field. This movement causes the voice coil to cut the magnetic flux lines, thereby generating an induced current. The magnitude and direction of this induced current will change with the change of the sound wave, and finally the sound signal will be converted into an electrical signal.

[0018] Specifically, the dynamic sound head 300 may include a dynamic sound head acoustic body 200, a piezoelectric ceramic sheet 105 and a front acoustic cavity 100. The dynamic sound head acoustic body 200, the piezoelectric ceramic sheet 105 and the front acoustic cavity 100 are combined and connected with a flexible circuit board 113.

[0019] The front acoustic cavity 100 includes 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 in the shape of a truncated cone, and 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 are combined to form a resonance cavity, the piezoelectric ceramic sheet 105 is arranged on the first step 101, the dynamic sound head sound body 200 is arranged in the second step resonance cavity, and the flexible circuit board 113 is arranged from the first opening 103 to the second opening 104 to connect the piezoelectric ceramic 200 and the dynamic sound head connection PCB board 112. In this embodiment, the front acoustic cavity 100 is made of plastic or metal, and plastic or metal has the advantages of good adhesion, good stability, etc.

[0020] The high frequency extension of the dynamic sound head sound body 200 can only reach the sound frequency of 20Hz to 15KHz, and the high frequency extension of this frequency range is insufficient. After the dynamic sound head sound body 200 is combined with the piezoelectric ceramic piece 105, the high frequency can be extended to 20Hz to 40KHz, and they are independent and driven separately.

[0021] The piezoelectric ceramic sheet 105 is arranged on the first step 101 of the front acoustic cavity 100, and the dynamic sound head sound body 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 dynamic sound head sound body 200 are connected by the flexible circuit board 113. The flexible circuit board 113 is connected to the dynamic sound head sound body 200 after being led out from the first opening 103 of the first step 101 and the second opening 104 of the second step 102, 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 dynamic sound head sound body 200. The use of the flexible circuit board 113 ensures the quality of the dynamic sound head sound body 200, improves production efficiency, improves yield, and reduces costs.

[0022] Piezoelectric ceramics are made of sintered ceramics. Piezoelectric ceramics are a type of information functional ceramic material that can convert mechanical energy and electrical energy into each other due to the piezoelectric effect. In addition to piezoelectricity, piezoelectric ceramics also have dielectric properties and elasticity. They have been widely used in medical imaging, acoustic sensors, acoustic transducers, ultrasonic motors, etc.

[0023] Piezoelectric ceramics are made by using the piezoelectric effect, which is a sensitive property. Piezoelectric ceramics are mainly used to manufacture ultrasonic transducers, hydroacoustic transducers, electroacoustic transducers, acoustic-electric transducers, ceramic filters, ceramic transformers, ceramic frequency discriminators, high-voltage generators, infrared detectors, surface acoustic wave devices, electro-optical devices, ignition and detonation devices, and piezoelectric gyroscopes.

[0024] Piezoelectric ceramics have sensitive characteristics and can convert extremely weak mechanical vibrations into electrical signals. They can be used in sonar systems, meteorological detection, remote environmental protection, household appliances, etc. The deformation of piezoelectric ceramics under the action of electric fields is very small, not exceeding one ten-millionth of its own size at most. The precise control mechanism made based on this principle, the piezoelectric driver, is a great boon for the control of precision instruments and machinery, microelectronics technology, bioengineering and other fields. Frequency control devices such as resonators and filters are key components that determine the performance of communication equipment. Piezoelectric ceramics have obvious advantages in this regard. It has good frequency stability, high precision and a wide applicable frequency range. It is also small in size, does not absorb moisture, and has a long life. It can improve anti-interference performance, especially in multi-channel communication equipment.

[0025] The piezoelectric ceramic sheet 105 includes one or more piezoelectric ceramic sound-permeable holes 106, which are used to make the dynamic sound head sound body 200 emit sound, which is beneficial to improve the sound quality. In this embodiment, the number of piezoelectric ceramic sound-permeable holes 106 is 6. Of course, in other specific embodiments, the number of piezoelectric ceramic sound-permeable holes 106 can also be other, such as 3, 10, etc.

[0026] The piezoelectric ceramic sheet 105 may be composed of a single-layer 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 may also include an elastic resistance layer (not shown in the figure), and the elastic resistance layer 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 dynamic sound head sound body 200 are installed in the first step 101 and the second step 102 respectively.

[0027] The flexible circuit board 113 includes four pins, and two pins at one end of the flexible circuit board 113 are respectively connected to the connection PCB board 112. The other end of the flexible circuit board 113 includes a long pin 205 and a short pin 206, and the long pin 205 and the short pin 206 are both connected to the piezoelectric ceramic sheet 105. The long pin 205 is connected to the third connection point 203 on the piezoelectric ceramic sheet 105, and the short pin 206 is connected to 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, and the fourth connection point 204 is adjacent to the edge of the piezoelectric ceramic sheet 105. 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.

[0028] Figure 4 This is a comparison of the frequency response curves of the dynamic sound head of this application and the ordinary dynamic sound head. Figure 4 It can be understood that after the piezoelectric ceramic sheet 105 is combined with the dynamic sound head acoustic body 200, the dynamic sound head acoustic body 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 complementary relationship, so that the dynamic sound head of this patent can emit a wider frequency response range and can better display clear and delicate high-frequency sound. In addition, the embodiment of this patent improves the performance of the dynamic sound head treble compensation while solving the problem of complex process and structure. Of course, in other specific embodiments, the piezoelectric ceramic sheet 105 and the dynamic sound head acoustic body 200 can also be connected to the connection PCB board 103 by other wire connection methods, such as by soft wire connection.

[0029] It should be mentioned that this patent combines a dynamic sound head sound body 200 that can emit low frequencies and a piezoelectric ceramic sheet 105 that can emit high frequencies. It has a simple structure and can reduce the cumbersome process of adding redundant high-frequency driving devices, thereby improving the sound quality.

[0030] The embodiment of the present invention also provides a dynamic microphone, which uses the aforementioned dynamic sound head 300. The dynamic microphone can emit a wider frequency by setting the dynamic sound head 300 of the embodiment of the present invention, has a simple structure, is convenient and practical, and has better sound quality.

[0031] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0032] In the description of this patent, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside", etc. indicate the orientation or position relationship based on the orientation or position relationship shown in the drawings, or the orientation or position relationship in which the patented product is usually placed when in use. They are only for the convenience of describing the simplified description of this patent, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of this patent. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0033] In addition, the terms "horizontal", "vertical", "overhanging" and the like do not mean that the components are required to be absolutely horizontal or overhanging, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0034] In the description of this patent, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal connection of two elements. For those skilled in the art, the specific meanings of the above terms in this patent can be understood according to specific circumstances.

[0035] The above is only a preferred embodiment of the patent and is not intended to limit the patent. For those skilled in the art, the patent may have various changes and variations. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the patent shall be included in the scope of protection of the patent. It should be noted that similar numbers 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 the subsequent drawings.

[0036] The above are only specific implementations of this patent, but the protection scope of this patent is not limited to this. Any technician familiar with this technical field can easily think of changes or substitutions within the technical scope disclosed by this patent, which should be covered by the protection scope of this patent. Therefore, the protection scope of this patent should be based on the protection scope of the claims.

Claims

1. A dynamic sound head, characterized in that: The dynamic sound head comprises: A front acoustic cavity, wherein the inner wall of the front acoustic cavity is provided with a first step and a second step in a truncated cone shape, the first step is provided with a first opening, the second step is provided with a second opening on the same side as the first opening, and the inner diameter of the first step is smaller than the inner diameter of the second step; A dynamic sound head sound body, the dynamic sound head sound body comprises a dynamic sound head intermediate body and a rear acoustic cavity located at the bottom of the dynamic sound head sound body, the dynamic sound head intermediate body is a step structure, a piezoelectric ceramic sheet is installed on the top of the dynamic sound head intermediate body, and a PCB board is connected at the bottom, the piezoelectric ceramic sheet is provided with a plurality of piezoelectric ceramic sound-permeable holes and cooperates with the first step, and the top of the dynamic sound head intermediate body cooperates with the second step; A connecting device is laid close to the outer surface of the intermediate body of the dynamic sound head, one end of which is connected to the connecting PCB board, and the other end is connected to the piezoelectric ceramic sheet. The connecting device located on the outer surface of the piezoelectric ceramic sheet cooperates with the first opening and the second opening.

2. The dynamic sound head according to claim 1, characterized in that: 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, and the other end is provided with a third pin and a fourth pin, the connecting PCB board is provided with a first connection point and a second connection point, the piezoelectric ceramic sheet is provided with a third connection point and a fourth connection point, and the first pin, the second pin, the third pin and the fourth pin are respectively connected to the first connection point, the second connection point, the third connection point and the fourth connection point.

3. The dynamic sound head according to claim 1, characterized in that: An elastic resistance layer is disposed on one side of the piezoelectric ceramic sheet, and the elastic resistance layer is bonded between the piezoelectric ceramic sheet and the first step.

4. The dynamic sound capsule according to claim 1, characterized in that: The dynamic sound head intermediate body comprises a vibration membrane, a coil, a pole piece, a magnet, a bracket and the connecting PCB board in sequence from top to bottom.

5. A dynamic microphone, characterized in that: The dynamic microphone uses the dynamic sound capsule as described in any one of claims 1 to 4.

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