Bone conduction speakers for ultrasonic and electroacoustic systems

Abstract

The present invention provides a bone conduction speaker for ultrasonic and electroacoustic systems, including an acoustic wave transducer and an acoustic wave coupler. The acoustic wave transducer is used to convert electrical signals into acoustic wave vibration energy, and is characterized in that: the acoustic wave coupler is composed of a kinetic energy output connecting rod 106, a positioning and elastic support sheet 107, a kinetic energy balancing gasket 108, a coupler damping spring sheet 109, a coupler resonant spring sheet 110, and an acoustic wave load plate; the present invention designs the transducer and the acoustic wave coupler separately, and the transducer focuses on improving energy efficiency and reducing acoustic wave distortion. The acoustic wave coupler of the present invention focuses on transmission efficiency and frequency response control. The solid-state transmission acoustic wave coupler of the present invention will greatly improve the transmission efficiency of bone conduction headphones and the coupling between acoustic wave solid objects and solid objects, and can greatly improve the conversion efficiency.

Description

Technical Field

[0001] The present invention relates to the field of bone conduction technology, and in particular to a bone conduction speaker for ultrasonic and electroacoustic systems. Background Art

[0002] The bone conduction speaker of the prior art is to closely combine the transducer device and the sound coupler into one body. Such a design is difficult to take into account various technical instructions in the transmission of sound quality energy and kinetic energy, and has the disadvantage of affecting the whole body by one hair.

[0003] The structure of the existing bone conduction speaker is as follows Figure 1 As shown, it includes a shell, a transducer, a sound coupler, a first vibration transmission plate, and a panel; the transducer device is arranged in the shell; the transducer device is suspended and connected to the shell through the first vibration transmission plate; the panel is connected to the transducer device and vibrates under the drive of the transducer device, wherein the panel protrudes from the shell, and a surrounding edge is arranged at the edge of the shell. There is a height difference between the surrounding edge and the panel. The force exerted by the skin on the panel reduces the distance between the panel and the surrounding edge. When the pressure between the bone conduction speaker and the user is greater than the force exerted by the first vibration transmission plate when it is deformed into the height difference, the excess clamping force will be transmitted to the skin through the surrounding edge. The process of energy transmission is as follows: Figure 2 shown.

[0004] Since the electroacoustic transducer and the sound coupler are an integrated structure, the transmission efficiency is low, the power consumption is high, and the signal distortion is large. Currently, when bone conduction speakers are used in wireless headsets, a 1-2W power amplifier is required to drive the speaker to reach a volume level that users can accept. The battery capacity of wireless headsets needs to be increased to maintain sufficient effective working time, which increases the cost and weight of the product. The large signal distortion significantly reduces the user experience and reduces the quality of the product. Summary of the invention

[0005] In view of this, the present invention provides a bone conduction speaker for ultrasonic and electroacoustic systems. In view of the shortcomings of the prior art, a new sound wave transmission design is adopted in the electroacoustic transducer and sound wave transmission structure, and the sound wave coupling unit independently completes the energy transmission and the frequency response control.

[0006] The objective of the present invention is achieved through the following technical solutions:

[0007] A bone conduction speaker for ultrasonic and electroacoustic systems, comprising a sound wave transducer and a sound wave coupler, wherein the sound wave transducer is used to convert an electrical signal into sound wave vibration energy, and the sound wave coupler is composed of a kinetic energy output connecting rod (106), a positioning and elastic supporting sheet (107), a kinetic energy balancing gasket (108), a coupler damping spring sheet (109), a coupler resonant spring sheet (110), and a sound wave load plate; the kinetic energy output connecting rod (106) is connected to the output end of the sound wave transducer to transmit the sound wave vibration energy to the coupler resonant spring sheet (110); through holes are provided in the middle of the positioning and elastic supporting sheet (107), the kinetic energy balancing gasket (108), the coupler damping spring sheet (109), and the coupler resonant spring sheet (110), and the through holes are used to allow the kinetic energy output connecting rod (106) to pass through;

[0008] The coupler resonant spring (110) is fixedly connected to the sound wave load plate; the coupler damping spring (109) is connected to the shell of the bone conduction speaker; the kinetic energy balancing gasket (108) is between the positioning and elastic support sheet (107) and the coupler damping spring (109), and the positioning and elastic support sheet (107) is connected to the shell of the bone conduction speaker.

[0009] Furthermore, the fixed connection between the coupler resonant spring (110) and the acoustic wave load plate includes welding, gluing or 3D printing.

[0010] Furthermore, the acoustic wave loading plate has at least one layer.

[0011] Furthermore, the acoustic wave loading plate has two layers, and the materials of each layer are different.

[0012] Furthermore, the coupler damping spring (109) and the coupler resonant spring (110) are respectively composed of at least one comb-tooth-shaped spring.

[0013] Furthermore, the number of the comb-shaped spring pieces is between 1 and 100.

[0014] Furthermore, the geometric shape of the coupler resonant spring (110) includes but is not limited to the following shapes: square, circular, triangular, single array, single spring, single disc or polygonal array.

[0015] Furthermore, the material of the coupler resonant spring (110) is a conductor material for sound waves.

[0016] Furthermore, the material thickness of the coupler resonant spring (110) is between 0.01 and 5 mm.

[0017] Furthermore, the length of the non-cylindrical coupler resonant spring (110) is between 1 mm and 1000 mm, and the width is between 0.1 mm and 100 mm; the diameter of the cylindrical coupler resonant spring (110) is between 0.01 mm and 10 mm, and the length is between 0.1 mm and 1000 mm.

[0018] The beneficial effects of the present invention are:

[0019] The present invention designs the transducer and the acoustic wave coupler separately. The transducer focuses on improving energy efficiency and reducing acoustic wave distortion. The acoustic wave coupler focuses on transmission efficiency and frequency response control. The solid-state transmission acoustic wave coupler of the present invention will greatly improve the transmission efficiency of bone conduction headphones and the coupling between acoustic wave solid objects and solid objects, and can greatly improve the conversion efficiency and minimize waveform distortion. In terms of frequency response, the bass is greatly improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the structure of a bone conduction speaker in the prior art;

[0021] Figure 2 A schematic diagram of the energy transmission process of a bone conduction speaker in the prior art;

[0022] Figure 3 It is a schematic structural diagram of the sound wave transducer of the present invention;

[0023] Figure 4 is a schematic diagram of the cross-sectional structure of the bone conduction speaker of the present invention;

[0024] Figure 5 A schematic diagram of the energy transmission process of the bone conduction speaker of the present invention;

[0025] Figure 6 is the audio spectrum with a base frequency of 500Hz;

[0026] Figures 7-1 to 7-7 Schematic diagram of coupler resonant springs of various shapes according to the present invention;

[0027] Figure 8-1 It is a graph showing the output power of a bone conduction speaker in the prior art;

[0028] Figure 8-2 This is a graph showing the output power of the bone conduction speaker of the present invention.

[0029] The following are the descriptions of the reference numerals:

[0030] 101: shell and outer magnetic circuit body, 102: magnet, 103: coil, 104: coil bracket, 105: elastic wave, 106: kinetic energy output connecting rod, 107: positioning and elastic support sheet, 108: kinetic energy balance gasket, 109: coupler damping spring sheet, 110: coupler resonance spring sheet, 111: acoustic wave loading plate A layer, 112: acoustic wave loading plate B layer. Specific embodiments

[0031] The embodiments of the present disclosure are described in detail below with reference to the accompanying drawings.

[0032] The following describes the embodiments of the present disclosure through specific examples, and those skilled in the art can easily understand other advantages and effects of the present disclosure from the contents disclosed in this specification. Obviously, the described embodiments are only a part of the embodiments of the present disclosure, rather than all of the embodiments. The present disclosure can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present disclosure. It should be noted that the following embodiments and features in the embodiments can be combined with each other without conflict. Based on the embodiments in the present disclosure, all other embodiments obtained by ordinary technicians in the field without making creative work are within the scope of protection of the present disclosure.

[0033] Embodiment 1

[0034] In order to better understand the present invention, the technical terms appearing in the present invention are explained as follows:

[0035] Sound waves: The present invention refers to all sound waves including ultrasound, infrasound, and those visible to the human ear.

[0036] Acoustic transducer: The present invention refers to an electroacoustic transducer for ultrasound, infrasound, and all sound waves visible to the human ear.

[0037] Solid-state transmission acoustic wave coupler: Solid-state refers to the fact that the volume and shape of a solid change little when subjected to a small external force. The invention refers to the form of a flexible and hard substance. The full name refers to a device that couples an acoustic wave vibration signal from one solid substance to another solid substance.

[0038] The present invention adopts a new sound wave transmission design, and the sound wave transducer adopts the kinetic energy unit of the traditional dynamic coil speaker, such as Figure 3 As shown in the dotted box. Except for the paper cone used to push the air, all the functions of the traditional dynamic speaker are retained. However, in terms of device design, the transducer generates kinetic energy with the lowest energy loss to improve efficiency, and in view of the serious signal distortion, a technical innovation design is made to address the signal distortion. This design is based on the fact that the dynamic speaker transducer unit is relatively mature, low cost, and easy to control quality.

[0039] A bone conduction speaker for ultrasonic and electroacoustic systems, comprising an acoustic transducer and an acoustic coupler, such as Figure 4 shown.

[0040] The acoustic wave transducer of the present invention is composed of a housing and an external magnetic circuit body 101, a coil 107, a magnet 102, and a spring 105. Its main function is to convert electrical signals into acoustic wave vibration energy. The acoustic wave transducer can be a moving coil type, a moving iron type, or a piezoelectric ceramic or PVDF membrane electroacoustic transducer. Its working principle is the same as that of a general speaker, which belongs to the public technology and is not elaborated as a technical focus.

[0041] The acoustic wave coupler of the present invention is composed of a kinetic energy output connecting rod 106, a positioning and elastic supporting sheet 107, a kinetic energy balancing gasket 108, a coupler damping spring sheet 109, a coupler resonant spring sheet 110, and an acoustic wave loading plate.

[0042] The sound waves output by the sound wave transducer are transmitted to the coupler resonant spring 110 by the kinetic energy output connecting rod 106. The coupler resonant spring 110 is composed of at least one comb-shaped spring. Each spring can be of different geometric shapes or different geometric sizes to determine its own resonant frequency. The required sound wave frequency response characteristics are synthesized on the load board through connection with the sound wave load board.

[0043] The positioning and elastic support sheet is combined with the damper 105 to limit the axial movement of the coil and prevent it from deviating to the surroundings.

[0044] The connection between 110 and the acoustic wave loading board can be welding, gluing or 3D printing. The acoustic wave loading board A layer 111, the acoustic wave loading board B layer 112 and the coupler resonant spring 110 determine the output frequency response curve. 111 and 112 are composed of different materials in order to produce the required frequency response curve. The acoustic wave loading board can also be a single layer material or a multi-layer material. The acoustic wave loading board has the function of receiving and synthesizing sound waves and transmitting the sound waves to the acoustic wave receptor.

[0045] The coupler damping spring 109 is connected to the shell and external magnetic circuit body 101, which is the shell of the bone conduction speaker of the present invention, and is used to relieve the stress effect of external pressure on the electroacoustic transducer, and also improve the response speed in terms of transient response.

[0046] The coupler damping spring 109 is composed of comb-shaped springs, each of which is a sound wave transmitter of a specific natural frequency. N springs form a coupler damping spring 109 of N frequency points, which is used to produce different damping effects on sound waves of different frequencies. From this, we can understand that in the sound wave frequency domain, different materials, materials and specific geometric dimensions can form damping springs 109 with different frequency bandwidths. Figure 6 is the audio spectrum with a fundamental frequency of 500 Hz.

[0047] The coupler resonant spring 110 is composed of comb-shaped springs, each of which is a sound wave transmitter of a specific natural frequency. N springs form a coupler resonant spring 110 group of N frequency points, which is used to improve the bandwidth of the coupler. From this, we can understand that in the sound wave frequency domain, different materials, materials and specific geometric dimensions can form coupler resonant springs 110 with different frequency bandwidths. The value of N is between 1 and 100.

[0048] The transmission frequency of the coupler resonant spring 110 is determined by its material and geometric dimensions.

[0049] Based on the above principle, the coupler resonant spring 110 of the present invention can be in any geometric shape. As long as the principle is consistent with the present invention, we can understand it as the same principle. The geometric shape can be square, circular, triangular, a single array, a single spring, a polygonal array. It can also be a single disc-shaped elastic body. Figure 7-1 to Figure 7-6 As shown, any shape that is changed according to the acoustic principle can be regarded as the same as the present invention. The composition of the coupler resonant spring 110 can be any shape, which does not affect the acoustic engineer's understanding of the principle of this project. For example, if the spring is replaced with a cylindrical material, we can understand that it is the same principle.

[0050] The material of the coupler resonant spring 110 can be any sound wave conductor, and can be any geometric material body, the thickness of the material is between 0.01-5mm, the length of the spring is between 1mm-1000mm, the width can be between 0.1mm-100mm, and the cylindrical spring can be between 0.01-10mm in diameter and 0.1-1000mm in length.

[0051] The same can be applied to three-dimensional interface bodies, polygonal cross-sections, and any freely transformable cross-section bodies.

[0052] like Figure 7-7 As shown, a circular coupler resonant spring is used as an example for explanation. When the radius R is between 1 and 1000 mm, the length L and width W of the coupler resonant spring 110 can be any value of R. When acoustic engineers understand the principle of this project, any change in the shape and size of the coupler resonant spring 110 within the R value range can be understood as the same.

[0053] The number of components of the coupler resonant spring piece 110 can be between 1 and 100. When acoustic engineers understand the principle of this project, changing the number of components of the coupler resonant spring piece 110 between 1 and 100 and any changes in shape, size, and quantity within the R value range can be understood as the same.

[0054] The coupler resonant spring 110 has an R value range, and the bending angles a1 and a2 can be between 1 and 360 degrees.

[0055] The height H1 of the coupler resonant spring 110 from the housing can be between 0.1 mm and 1000 mm.

[0056] As shown in the front view, the width W1 and height H of the damping spring 109 can be any R value. When the acoustic engineer understands the principle of this project, any change in shape and size within the R value range, and any change in the contact position with the shell can be understood as the same.

[0057] The cross-section of the coupler resonant spring 110 and the damper spring 109 can be a strip, or a cylindrical, triangular, or polygonal spring cross-section. When acoustic engineers understand the principle of this project, they can arbitrarily change the materials and cross-sectional shapes of the coupler resonant spring 110 and the damper spring 109, and we can understand them as the same.

[0058] The coupler resonant spring 110 and the damper spring 109 can be made of any sound-conducting material. When acoustic engineers understand the principle of this project, we can understand that the changes in materials are the same.

[0059] 111 and 112 connected to the coupler resonant spring group 110 are acoustic wave load plates, which are responsible for receiving and transmitting acoustic waves. They can be a single layer of the same material, a two-layer or a multi-layer composite plate. It can be a square, circular, triangular, polygonal array, etc. The load plate is also a part of the acoustic wave coupler. Different materials form different frequency combinations. It can be a single material or a composite surface of multiple materials. It can also be a special composite shape printed by 3D. The shape can be understood as a plane body of any shape or an appearance made into a special shape, such as a spherical concave and convex surface. As long as it does not violate the principles of this project, we can understand it as the same.

[0060] The length and width of the polygonal coupler resonant spring 110 can be 0.1-1000 mm, the thickness can be 0.1-10 mm, and it can be an equilateral polygon or an irregular polygon. The diameter of the circle can be 1-1000 mm.

[0061] The electroacoustic transducer and the acoustic wave coupler of the present invention work independently and have better compatibility in terms of energy conversion efficiency, acoustic wave quality and transmission efficiency.

[0062] The present invention adopts the electroacoustic transducer system of the traditional loudspeaker and the earphone speaker, so the advantage is that the production cost is reduced and the production process is mature.

[0063] Due to the improvement of transmission efficiency, compared with the application of bone conduction earphone products, the driving power of the bone conduction speaker of the popular products on the market is 1-2W. After replacing the product of the present invention, only 0.3W driving power is required.

[0064] In terms of frequency response, the bass has been greatly improved. Figure 8-1 and Figure 8-2 Under the same driving power, when the output power is at a frequency of 250Hz, the output sound pressure level of the existing product is increased from 62dBSPL to 92dBSPL.

[0065] The audio distortion has been improved by 1-10%.

[0066] The above is only for explaining the implementation mode of the present invention and is not intended to limit the present invention. For those skilled in the art, any modification, equivalent substitution, improvement, etc. made within the spirit and principle of the present invention without creative work should be included in the protection scope of the present invention.

Claims

1. A bone conduction speaker for ultrasonic and electroacoustic systems, comprising an acoustic transducer and an acoustic coupler, wherein the acoustic transducer is used to convert electrical signals into acoustic vibration energy, characterized in that: The acoustic wave coupler comprises a kinetic energy output connecting rod (106), a positioning and elastic supporting sheet (107), a kinetic energy balancing gasket (108), a coupler damping spring sheet (109), a coupler resonant spring sheet (110), and an acoustic wave load plate; the kinetic energy output connecting rod (106) is connected to the output end of the acoustic wave transducer to transmit the acoustic wave vibration energy to the coupler resonant spring sheet (110); a through hole is provided in the middle of the positioning and elastic supporting sheet (107), the kinetic energy balancing gasket (108), the coupler damping spring sheet (109), and the coupler resonant spring sheet (110), and the through hole is used for the kinetic energy output connecting rod (106) to pass through; The coupler resonant spring (110) is fixedly connected to the sound wave load plate; the coupler damping spring (109) is connected to the housing of the bone conduction speaker; the kinetic energy balancing gasket (108) is between the positioning and elastic support sheet (107) and the coupler damping spring (109), and the positioning and elastic support sheet (107) is connected to the housing of the bone conduction speaker; The acoustic wave loading plate comprises at least one layer; The coupler damping spring sheet (109) and the coupler resonant spring sheet (110) are respectively composed of at least one comb-tooth-shaped spring sheet.

2. The bone conduction speaker for ultrasonic and electroacoustic systems according to claim 1, characterized in that: The coupler resonant spring (110) is fixedly connected to the sound wave load plate, including welding, gluing or 3D printing into one body.

3. The bone conduction speaker for ultrasonic and electroacoustic systems according to claim 1, characterized in that: The acoustic wave loading plate has two layers, and the materials of each layer are different.

4. The bone conduction speaker for ultrasonic and electroacoustic systems according to claim 1, characterized in that: The number of the comb-shaped spring pieces is between 1 and 100.

5. The bone conduction speaker for ultrasonic and electroacoustic systems according to claim 1, characterized in that: The geometric shape of the coupler resonant spring (110) includes but is not limited to the following shapes: square, circular, triangular, single array, single spring, single disc or polygonal array.

6. The bone conduction speaker for ultrasonic and electroacoustic systems according to claim 5, characterized in that: The material of the coupler resonant spring (110) is a conductor material for sound waves.

7. The bone conduction speaker for ultrasonic and electroacoustic systems according to claim 6, characterized in that: The material thickness of the coupler resonant spring (110) is between 0.01 mm and 5 mm.

8. The bone conduction speaker for ultrasonic and electroacoustic systems according to claim 7, characterized in that: The length of the non-cylindrical coupler resonant spring piece (110) is between 1 mm and 1000 mm, and the width is between 0.1 mm and 100 mm; the diameter of the cylindrical coupler resonant spring piece (110) is between 0.01 mm and 10 mm, and the length is between 0.1 mm and 1000 mm.

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