CN110536207A - Bone-conduction device - Google Patents

Abstract

The invention discloses a kind of bone-conduction devices, the bone-conduction device is various types of devices using bone conduction technology, the bone-conduction device contains the osteoacusis module for transmitting sound, the osteoacusis module is equipped with metal material component, and the metal material component in the osteoacusis module is amorphous alloy in whole or in part.The sound timbre that bone-conduction device in the present invention passes out is more preferably, the deflection realized in amorphous alloy deformation process wherein can conduct different acoustical qualities, there is stronger realization space in terms of sound quality, so as to make wearer obtain better level of sound quality by changing, weight other conventional materials of bottom and high pitch etc. need to obtain by the obtainable audio of higher deformation force ability and sound quality using the amorphous alloy of specific system, without changing overall construction design.

Description

bone conduction device

technical field

The invention relates to a bone conduction device.

Background technique

The auditory system is an important sensory organ for human beings to receive external signals. Under normal circumstances, the sound wave generated by the vibration of the sound source is transmitted to the inner ear through two channels: one is transmitted to the inner ear through the external auditory canal, the tympanic membrane and the ossicle chain composed of three ossicles, that is, the air conduction of the sound wave. It is the main conduction path of normal hearing; the second is to transmit directly to the inner ear through the skull, that is, bone conduction, which has little effect under normal physiological conditions.

The main way of bone conduction to transmit sound is that the sound passes through the skull to vibrate the cochlea wall. There are two main conduction modes:

First, compression bone conduction (Compression Bone Conduction) refers to the transmission of vibration to the cochlea through the skull, so that the cochlear wall expands and shrinks with the change of the sound wave density phase, so that the inner ear lymph fluid with small compressibility flows to the cochlea. Windows and vestibule windows move. Because the ratio of lymph fluid in the scala vestibule and scala tympani is 5:3, and the cochlear window membrane is more mobile than the stapes plate, when the bone wall is compressed by sound waves, the lymph fluid in the scala vestibule flows to the scala tympani. The basement membrane moves down; when the bone wall expands with the ultrasonic wave, the lymph fluid flows back and the basement membrane moves up. This repeatedly lowers the basilar membrane to vibrate, effectively stimulating the spiral organ of the inner ear;

The second is mobile bone conduction (Expansion Bone Conduction), which means that when sound waves act on the skull, the entire skull, including the cochlea, vibrates. Because of the inertia of the lymph fluid, when the cochlear wall is displaced, the only part of the inner ear lymph fluid is always slightly behind the former, and moves in the opposite direction, which causes the basement membrane to vibrate and stimulate the inner ear spiral organ.

In the prior art, bone conduction technology is concentratedly used in bone conduction devices such as bone conduction hearing aids, bone conduction microphones, bone conduction mobile phones, bone conduction earphones, etc., especially bone conduction earphones, which have been promoted in the civilian field in recent years. In surveys in recent years, many research institutions have found that the use of traditional in-ear headphones has caused continuous hearing damage to the users, especially those who have used in-ear headphones for a long time. The way of sound conduction is different, it will not cause damage to the ears, and it is a good replacement for existing in-ear headphones. With the gradual expansion of the application field of bone conduction technology, the research on bone conduction technology has become more and more in-depth and subdivided. For example, the research on the structure and distribution application of bone conduction speakers has already established a certain foundation in the fields of earphones and glasses. With the popularization and application of bone conduction products, related technologies will be further researched and developed.

Since the civilian use of bone conduction technology has not been promoted on a large scale, the existing bone conduction devices on the market often stay at the stage of "usable", that is, they can be guaranteed to be used. Research and development, but the technology that can be commercially transformed is mainly focused on the structural design of bone conduction devices and the development of new products, and there has been no leapfrog development. Commonly used materials in bone conduction devices are general-purpose materials such as rubber, plastic, conventional metal materials, or other composite materials. The performance of the above-mentioned general-purpose materials is limited, and it is difficult to produce excellent acoustic effects when applied to bone conduction devices. The acoustic effect is far from other existing devices, especially in the sound transmitted by the bone conduction device, the more saturated frequency band is missing, resulting in monotonous sound, poor use effect, and it is difficult to hit the higher-end sound generator market. The defects cannot be improved by the method of structural design.

The part of the metal material in the bone conduction device plays a very critical role in the conduction of sound waves. In the prior art, the metal material in the bone conduction device is usually preferably made of steel. On the one hand, the steel material is chosen because it is cheap and easy to obtain, and the processing technology is mature, and the formability is also very good. On the other hand, the steel material is hard and has a long service life. Compared with plastic materials, it can withstand harsher use environments. However, in the actual use process, it is found that the anti-rust and anti-corrosion performance of steel materials is really average, especially the part of the bone conduction device that contacts human skin during use (the environment that has been eroded by sweat and oil for a long time) is very easy to rust, and due to the density High and its own characteristics, it is difficult to satisfy the sound quality transmission, especially in pursuit of better sound quality, so the parts such as the sound transmission plate are designed to be longer and larger. When the vibrator vibrates, the vibrating plate transmits different amplitudes according to the frequency released by the vibrator. Due to the limitation of its own elastic limit and high elastic modulus, the steel material can only produce the required force when the vibrating plate needs to reach a large force. The amount of deformation, which makes the battery capacity and electronic control ability of the bone conduction device need to be enhanced in order to achieve the expected sound quality effect, which increases energy consumption (higher sound quality requires a larger battery), and makes the weight of the bone conduction device high No less, it not only increases the processing cost, but also makes the overall structure of the bone conduction device bulky, which runs counter to the current trend of thin and light electronic products, and naturally cannot gain a foothold in the consumer market.

Although iron and steel materials have very obvious shortcomings, because the comprehensive performance of the materials that may be used for replacement in the prior art is not as good as that of steel materials, especially when it comes to lightweight design, those skilled in the art consider the requirements of light and thin design , it will not be replaced by materials with a density higher than steel materials, and some materials with lower densities than steel materials (such as special plastics, magnesium alloys, aluminum alloys) cannot meet the requirements in terms of sound quality conduction, so steel materials are still First choice for metal components on bone conduction devices.

Contents of the invention

In order to overcome the deficiencies of the prior art, the purpose of the present invention is to provide a bone conduction device, which can improve the sound quality of the conducted sound and reduce the thickness of the overall structure.

The purpose of the present invention adopts following technical scheme to realize:

Bone conduction device, the bone conduction device is various types of devices using bone conduction technology, all or part of the metal material components of the bone conduction device are amorphous alloys, that is: the bone conduction device contains The sound bone conduction module is provided with a metal material component, and all or part of the metal material component in the bone conduction module is an amorphous alloy.

Further, the amorphous alloy is one or more of zirconium-based amorphous alloys, rare earth-based amorphous alloys, copper-based amorphous alloys, titanium-based amorphous alloys, aluminum-based amorphous alloys, and magnesium-based amorphous alloys. kind.

Further, the amorphous alloy is a zirconium-based amorphous alloy, and its composition is (Zr, Hf)aAlbCuc(Sn, Mg)d(Y, Ag)e, wherein each of a, b, c, d, and e Independently represent the atomic percentage, 55≤a≤72, 6≤b≤17, 16≤c≤24, 0≤d≤5, 0.2≤e≤1; or, the amorphous alloy is a titanium-based amorphous alloy, Its composition is (Ti, Zr) aCub Sn c (Si, Al, B) d, where a, b, c, d each independently represent atomic percentage, 50≤a≤65, 20≤b≤35, 7 ≤c≤20, 1≤d≤6, wherein the atomic percentage of Ti is higher than 40%.

Further, the amorphous alloy is one or more of the following alloys:

Zr62.4Hf2.7Al12Cu20Sn1Mg1.2YAg0.8;

Zr65.7Hf2.5Al11Cu18Sn1Mg1Ag0.8;

Zr70.1Hf1.4Al10Cu16.2Sn1Mg1Ag0.3;

Zr64.3Hf1.8Al13.2Cu17SnMg3Y0.3Ag0.4;

Ti58Zr2Cu25Sn10Si0.8Al4B0.2;

Ti54Zr4Cu30Sn7Si1Al4;

Ti59.3Zr2Cu25Sn11Al2B0.7;

Ti62.5Zr0.5Cu25Sn8Si1Al2.7B0.3.

Further, the bone conduction module is a piezoelectric bone conduction device or an electromagnetic bone conduction device;

The metal material component in the piezoelectric bone conduction device is one or more of the metal substrate in the piezoelectric vibrator, the conductive material at the junction with the human body, and the shell structure protecting the piezoelectric vibrator;

The metal material components in the electromagnetic bone conduction device are one or more of the bone conduction vibrator, the bone conduction vibrator fixing structure, the conductive material at the junction with the human body, and the shell structure for protecting the bone conduction vibrator.

Further, the metal material component in the bone conduction module is one or more of an internal or external skeleton structure, an external shell structure or a connection structure.

Further, the volume ratio of the amorphous alloy in the metal material component in the bone conduction module is greater than or equal to 10% of the overall metal material component.

Further, the volume ratio of the amorphous alloy in the metal material component of the bone conduction module is greater than or equal to 30% of the overall metal material component.

Further, the bone conduction device is a bone conduction microphone or bone conduction glasses or a bone conduction mobile phone or a bone conduction hearing aid.

Compared with the prior art, the beneficial effects of the present invention are:

1. The sound quality of the sound transmitted by the bone conduction device in the present invention is better. Compared with conventional metal materials, the amorphous alloy has high strength, lower elastic modulus and higher elastic limit, which can improve the sound quality of the device. The corresponding amount of deformation can be achieved when a small force conduction is required, so that the wearer can obtain corresponding sound conduction and save energy. The deformation amount achieved during the deformation process of the amorphous alloy can transmit different sound quality effects. There is a stronger room for realization in terms of sound quality, so that the wearer can obtain a better sound quality level by changing the sound effect and sound quality of other conventional materials such as heavy bass and treble, which require higher deformation force. Use a specific system The amorphous alloy can be obtained without changing the overall structural design.

2. The bone conduction device in the present invention uses amorphous alloys to replace the original metal materials according to different bone conduction principles. In piezoelectric bone conduction devices and electromagnetic bone conduction devices, by setting the proportion of amorphous alloy materials And the characteristics reduce the overall weight of the device, thereby indirectly reducing the required battery capacity and the weight of the control motor, making the bone conduction device lighter and thinner as a whole, increasing the comprehensiveness of different sound qualities and timbres, and making the timbre and sound quality of the device more perfect at the same time , without compromising the portability and wearability of the device, and without compromising battery life.

3. In the bone conduction device of the present invention, since all or part of the metal material components therein are amorphous alloys, the amorphous alloy has the effect of sterilization and disinfection. During use, the bone conduction device is subjected to sweat, dust, oil and other In the case of material contamination, the part formed by the amorphous alloy can effectively control the growth of bacteria, so that the bone conduction device is always in a safe and hygienic use environment.

Description of drawings

Fig. 1 is a structural schematic diagram of the piezoelectric vibrator of the piezoelectric bone conduction device in the present invention;

Fig. 2 is a schematic structural diagram of a piezoelectric bone conduction device in the present invention;

Fig. 3 is a schematic structural diagram of the electromagnetic bone conduction device in the present invention.

Detailed ways

The present invention will be described in detail below in conjunction with the accompanying drawings and embodiments.

Embodiment 1 Piezoelectric bone conduction device

Piezoelectric bone conduction device is a device that uses the inverse piezoelectric effect of piezoelectric ceramics to conduct sound transmission. The piezoelectric vibrator is directly driven by an electrical signal with audio frequency, and vibration is generated through the mechanical deformation of the piezoelectric vibrator. The vibration is transmitted to the human body through the skull. The cochlea to perceive sound. The piezoelectric vibrator is the most important core structure in the piezoelectric bone conduction device. The bone conduction device using the piezoelectric vibrator generally has a resonance frequency of 1KHz or higher, so the occurrence of the low frequency region of the piezoelectric bone conduction device is easy. Insufficient reproduction, how to fully conduct conduction in the low-frequency region is the research focus of piezoelectric bone conduction devices.

Piezoelectric ceramics are generally used in piezoelectric vibrators, but because piezoelectric ceramics are hard and brittle, and the displacement or force that can be generated is very small (the amplitude of vibration is very small), piezoelectric ceramics are generally not directly used as driving components. , but bonded together with an elastic metal substrate to make a composite structure, the composite structure is the piezoelectric vibrator. In the prior art, stainless steel or pure copper sheets are often combined with piezoelectric ceramics, but the resulting piezoelectric vibrator has poor conduction effect in the low-frequency region and insufficient sound reproduction (low frequency is the basis of sound).

In the piezoelectric bone conduction device of this embodiment, as shown in FIG. 1 , piezoelectric ceramics 101 and an amorphous alloy substrate 102 form a piezoelectric vibrator. The amorphous alloy substrate 102 can be entirely made of amorphous alloy material or partly made of amorphous alloy material, and partly made of amorphous alloy material, wherein the volume ratio of the amorphous alloy is greater than or equal to that of the overall metal material component 10% to ensure that the metal material component has better strength, lower elastic modulus and higher elastic limit, so that the bone conduction device has a better sound quality level, preferably greater than or equal to the overall metal material component 30% of.

The thickness of metal material components made of amorphous alloys is 15-60% of the thickness of ordinary crystalline alloy materials with the same structure, which can meet the requirements of use. It can not only meet the requirements of strength, hardness, and corrosion resistance, but also achieve thinning. Effect. In the piezoelectric vibrator in this embodiment, the substrate 102 made of zirconium-based amorphous alloy material is 20% thinner than the pure copper substrate, and has higher strength and lower elastic modulus, without excessive vibration The sound can be transmitted, and the effective transmission of the low frequency range can be realized.

As shown in Figure 2, it is a schematic diagram of a simplified structure of a piezoelectric bone conduction device. The piezoelectric vibrator 202 is provided with a protective shell structure 201 , and is connected to a conduction column 203 , and transmits sound to a human body 204 through the conduction column 203 . In this structure, the conduction column 203 and the protective shell structure 201 can also be made of amorphous alloy material entirely or partly made of amorphous alloy material, and partly made of amorphous alloy material, wherein the amorphous alloy is The proportion is greater than or equal to 10% of the overall metal material component, preferably greater than or equal to 30% of the overall metal material component. For the housing 201 as a protective structure, the thickness of the amorphous alloy material can be appropriately increased, preferably 50-60% of the thickness of the common crystalline alloy material of the same structure to meet the requirements of use, and as the conduction column of the conduction structure, The thickness is subject to different designs, and generally it is preferably 30-60% of the thickness of common crystalline alloy materials with the same structure to meet the use requirements.

Embodiment 2 Electromagnetic bone conduction device

The principle of the electromagnetic bone conduction device is similar to that of the piezoelectric type, except that the bone conduction vibrator is a composite structure of magnets.

Figure 3 is a schematic diagram of a simple structure of an electromagnetic bone conduction device. The bone conduction device mainly includes a bone conduction vibrator 304, a fixed structure 302 arranged on both sides of the bone conduction vibrator, a protective front shell 301, and a protective rear shell 303, wherein any one of the protective front and rear shells can be used as a conduction conductor at the junction with the human body. The material is the same as the conduction column 203 in Embodiment 1.

The above-mentioned structures can all be made of amorphous alloy materials or partially made of amorphous alloy materials, and some of them are made of amorphous alloy materials, wherein the volume ratio of the amorphous alloy is greater than or equal to 10% of the overall metal material component. %, preferably greater than or equal to 30% of the overall metal material component. For the shells 301 and 303 as protective structures, the thickness of the amorphous alloy material can be appropriately increased, preferably 50-60% of the thickness of the common crystalline alloy material of the same structure to meet the requirements for use. If a certain side is The thickness of the contact side is subject to the design requirements of the contact side, generally preferably 30-60% of the thickness of the common crystalline alloy material with the same structure to meet the use requirements (thinner).

In Examples 1 and 2, the amorphous alloy is made into a sounding alloy component for application, so the elastic limit of the metal material component amorphous alloy in the bone conduction device or the structure containing the amorphous alloy is selected as 1.8-3.5%, Vickers The hardness is selected to be 350-900HV, the tensile strength is selected to be 1200-3000MPa, the yield strength is selected to be 800-1500MPa, and the surface roughness Ra is preferably less than 0.01μm. Among them, the elastic limit is preferably above 2.2%, the Vickers hardness is selected from 450-600HV, the tensile strength is selected from 1800-2300MPa, and the yield strength is preferably selected from 900-1200MPa, which can take into account the manufacturing difficulty, preparation cost and mechanical properties of amorphous alloys. To prevent the performance from not meeting the requirements, it is also necessary to prevent the increase in cost caused by excess performance.

Example 3

In a piezoelectric bone conduction device or an electromagnetic bone conduction device, one or more of its internal or external skeleton structure, external shell structure or connection structure is made of amorphous alloy or partially made of amorphous alloy, For example, the connection part in the middle of the rear-mounted bone conduction earphone (overall structure), the outer shell and the inner shell that protect the sound transmission components on both sides, etc., in these components that are only used as structural parts, the proportion of amorphous alloys in terms of volume, Greater than or equal to 10% of the overall metal material component can meet the demand, and the proportion of amorphous state can be increased according to the use requirements, up to 90% (excessively high amorphous content puts higher demands on the amorphous alloy manufacturing process requirements, and the cost of preparation soars). The thickness of metal material components made of amorphous alloys is 20-80% of the thickness of ordinary crystalline alloy materials with the same structure, preferably 40-60% of the thickness of ordinary crystalline alloy materials with the same structure, and the maximum forming ability of amorphous alloys is greater than 2mm It can be practical, and it can be processed and manufactured by common casting techniques such as die-casting and casting.

For the above-mentioned structural parts, the elastic limit of the amorphous alloy or the structure containing the amorphous alloy is selected as 1.8-3.2%, the Vickers hardness is selected as 350-900HV, the tensile strength is selected as 1800-3000MPa, and the yield strength is selected as 800- 1500MPa. Among them, the elastic limit is preferably 2.5% or more, the Vickers hardness is 450-600HV, the tensile strength is 1800-2300MPa, and the yield strength is 1000-1200MPa, which can take into account the manufacturing difficulty, preparation cost and mechanical properties of the amorphous alloy. To prevent the performance from not meeting the requirements, it is also necessary to prevent the increase in cost caused by excess performance.

In the present invention, suitable amorphous alloy systems include zirconium-based amorphous alloys, rare earth-based amorphous alloys, copper-based amorphous alloys, titanium-based amorphous alloys, aluminum-based amorphous alloys, and magnesium-based amorphous alloys. One or more, in terms of biocompatibility, difficulty of preparation process and cost, zirconium-based amorphous alloy or titanium-based amorphous alloy is more preferably used.

After the present invention carefully studies the characteristics of the bone conduction device, the amorphous alloy is a zirconium-based amorphous alloy, and its composition is (Zr, Hf) a Al b Cu c (Sn, Mg) d (Y, Ag) e, Wherein a, b, c, d, e each independently represent an atomic percentage, 55≤a≤72, 6≤b≤17, 16≤c≤24, 0≤d≤5, 0.2≤e≤1;

The amorphous alloy is a titanium-based amorphous alloy, and its composition is (Ti, Zr) a Cu b Sn c (Si, Al, B) d, where a, b, c, and d each independently represent an atomic percentage, and 50 ≤a≤65, 20≤b≤35, 7≤c≤20, 1≤d≤6, wherein the atomic percentage of Ti is higher than 40%;

The above two amorphous alloy systems are the best choices.

Applicable amorphous alloy compositions such as:

Zr62.4Hf2.7Al12Cu20Sn1Mg1.2YAg0.8

Zr65.7Hf2.5Al11Cu18Sn1Mg1Ag0.8

Zr70.1Hf1.4Al10Cu16.2Sn1Mg1Ag0.3

Zr64.3Hf1.8Al13.2Cu17SnMg3Y0.3Ag0.4

Ti58Zr2Cu25Sn10Si0.8Al4B0.2

Ti54Zr4Cu30Sn7Si1Al4

Ti59.3Zr2Cu25Sn11Al2B0.7

Ti62.5Zr0.5Cu25Sn8Si1Al2.7B0.3.

The above-mentioned amorphous alloys are applied to bone conduction devices, such as bone conduction earphones, bone conduction microphones or bone conduction glasses, which not only have excellent mechanical properties and high sound conduction performance, but also have bactericidal properties, which can effectively inhibit the growth of bacteria Well, for those who are sensitive to metals.

Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the embodiments of the present invention and not to limit them. Although the embodiments of the present invention have been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should It is understood that modifications or equivalent replacements can still be made to the technical solutions of the embodiments of the present invention, and these modifications or equivalent replacements cannot make the modified technical solutions deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims (9)

1. Bone conduction device, the bone conduction device is various types of devices using bone conduction technology, the bone conduction device contains a bone conduction module for transmitting sound, and the bone conduction module is provided with metal material components, It is characterized in that all or part of the metal material components in the bone conduction module are amorphous alloys. 2. The bone conduction device according to claim 1, wherein the amorphous alloy is zirconium-based amorphous alloy, rare earth-based amorphous alloy, copper-based amorphous alloy, titanium-based amorphous alloy, aluminum-based amorphous alloy One or more of alloys and magnesium-based amorphous alloys. 3. The bone conduction device according to claim 1, wherein the amorphous alloy is a zirconium-based amorphous alloy, and its composition is (Zr, Hf)aAlbCuc(Sn, Mg)d(Y, Ag)e , where a, b, c, d, e each independently represent an atomic percentage, 55≤a≤72, 6≤b≤17, 16≤c≤24, 0≤d≤5, 0.2≤e≤1; or , the amorphous alloy is a titanium-based amorphous alloy, and its composition is (Ti, Zr)aCubSnc(Si, Al, B)d, wherein a, b, c, and d each independently represent an atomic percentage, 50≤a≤65, 20≤b≤35, 7≤c≤20, 1≤d≤6, wherein the atomic percentage of Ti is higher than 40%. 4. The bone conduction device according to claim 3, wherein the amorphous alloy is one or more of the following alloys: Zr62.4Hf2.7Al12Cu20Sn1Mg1.2YAg0.8; Zr65.7Hf2.5Al11Cu18Sn1Mg1Ag0.8; Zr70.1Hf1.4Al10Cu16.2Sn1Mg1Ag0.3; Zr64.3Hf1.8Al13.2Cu17SnMg3Y0.3Ag0.4; Ti58Zr2Cu25Sn10Si0.8Al4B0.2; Ti54Zr4Cu30Sn7Si1Al4; Ti59.3Zr2Cu25Sn11Al2B0.7; Ti62.5Zr0.5Cu25Sn8Si1Al2.7B0.3. 5. The bone conduction device according to claim 1, wherein the bone conduction module is a piezoelectric bone conduction device or an electromagnetic bone conduction device; The metal material component in the piezoelectric bone conduction device is one or more of the metal substrate in the piezoelectric vibrator, the conductive material at the junction with the human body, and the shell structure protecting the piezoelectric vibrator; The metal material components in the electromagnetic bone conduction device are one or more of the bone conduction vibrator, the bone conduction vibrator fixing structure, the conductive material at the junction with the human body, and the shell structure for protecting the bone conduction vibrator. 6 . The bone conduction device according to claim 1 , wherein the metal material component in the bone conduction module is one or more of an internal or external skeleton structure, an external shell structure or a connection structure. 7 . The bone conduction device according to claim 1 , wherein the proportion of the amorphous alloy in the metal material component in the bone conduction module is greater than or equal to 10% of the whole metal material component by volume. 8 . The bone conduction device according to claim 1 , wherein the volumetric proportion of the amorphous alloy in the metal material component in the bone conduction module is greater than or equal to 30% of the overall metal material component. 9. The bone conduction device according to any one of claims 1-8, wherein the bone conduction device is a bone conduction microphone or bone conduction glasses or a bone conduction mobile phone or a bone conduction hearing aid.