Bone conduction earphone

Abstract

The invention relates to the technical field of earphones, and discloses a bone conduction earphone, the stiffness coefficient k2 of an elastic sheet in the earphone and omegat12 + omegat22 are in a monotonic positive correlation relationship, and omegat1 and omegat2 are target resonant frequencies; the stiffness coefficient k2 and k3 of the elastic sheet are in a monotonous negative correlation relationship, and k3 is the stiffness coefficient formed when the vibration transmission cabin and the earphone handle are attached to the ear; the stiffness coefficient k2 of the elastic sheet and m1 are in a monotonous positive correlation relationship, and m1 is the mass of the vibration transmission cabin shell, the stator, the elastic sheet and the earphone handle; the stiffness coefficient k2 of the elastic sheet and m2 are in a monotonous positive correlation relationship, and m2 is the mass of the rotor. According to the invention, the stiffness coefficient of the elastic sheet is designed according to the correlation between other parameters in the earphone and the stiffness coefficient of the elastic sheet, so that the stiffness coefficient required by the elastic sheet can be accurately obtained to ensure that the elastic sheet has better elastic performance, thereby ensuring the sound production quality of the bone conduction vibrator, and improving the sound quality of the earphone. The earphone has important significance for improving the use experience of the earphone, and has good practicability.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of earphones, in particular to a bone conduction earphone. BACKGROUND

[0002] The bone conduction earphone is a kind of earphone that converts sound into mechanical vibration of different frequencies by using built-in bone conduction vibrator to propagate sound through vibration, and its working principle is as follows: after the audio signal is converted into an electric signal, it is transmitted to the bone conduction vibrator through the connecting line, thereby driving the bone conduction vibrator to produce corresponding vibration, so that the user directly receives the corresponding sound through vibration.

[0003] The vibration of the bone conduction vibrator is driven by the change of its own magnetic field, and the dynamic piece is driven by the elastic piece, and the elastic piece drives the shell, so that the whole vibrator vibrates.

[0004] As can be seen, the elastic performance of the elastic piece will directly affect the sound quality of the bone conduction vibrator, and the elastic performance of the elastic piece mainly depends on the design of the stiffness coefficient, that is, the stiffness coefficient cannot be designed too large or too small, therefore, how to accurately design the stiffness coefficient of the elastic piece to ensure that the elastic piece has better elastic performance has become a technical problem to be solved by the technical personnel in the field.

[0005] The above information is given as background information only to assist with understanding the present disclosure, and does not determine or acknowledge whether any of the above content can be used as prior art against the present disclosure. SUMMARY

[0006] The present application provides a bone conduction earphone to accurately design the stiffness coefficient of the elastic piece to ensure that the elastic piece has better elastic performance.

[0007] To achieve the above purpose, the present application provides the following technical solutions:

[0008] In a first aspect, the present application provides a bone conduction earphone, comprising an earphone main body; wherein,

[0009] The earphone main body comprises a vibration transmission cabin and an earphone handle connected with the vibration transmission cabin;

[0010] The vibration transmission cabin comprises a vibration transmission cabin shell and a bone conduction vibrator arranged in the vibration transmission cabin shell;

[0011] The bone conduction vibrator comprises a stator, a dynamic piece and an elastic piece;

[0012] The stiffness coefficient k2 of the elastic piece and is a monotonic positive correlation, and ω t1 and ω t2 is the target resonance frequency;

[0013] The stiffness coefficient k2 of the elastic sheet is in a monotonous negative correlation with k3, and k3 is a stiffness coefficient formed by the transmission cabin and the earphone handle fitting the ear;

[0014] The stiffness coefficient k2 of the elastic sheet is in a monotonous positive correlation with m1, and m1 is the mass of the transmission cabin shell, the stator, the elastic sheet and the earphone handle;

[0015] The stiffness coefficient k2 of the elastic sheet is in a monotonous positive correlation with m2, and m2 is the mass of the mover.

[0016] Further, in the bone conduction earphone, the stiffness coefficient k2 of the elastic sheet is in a monotonous linear positive correlation with ω t1 2 +ω t2 2 in a monotonous linear positive correlation;

[0017] The stiffness coefficient k2 of the elastic sheet is in a monotonous linear negative correlation with k3;

[0018] The stiffness coefficient k2 of the elastic sheet is in a monotonous linear positive correlation with m1;

[0019] The stiffness coefficient k2 of the elastic sheet is in a monotonous linear positive correlation with m2.

[0020] Further, in the bone conduction earphone, the stiffness coefficient k2 of the elastic sheet satisfies the following relationship:

[0021]

[0022] Further, in the bone conduction earphone, the bone conduction earphone is a semi-in-ear bone conduction earphone;

[0023] k3 is a stiffness coefficient formed by the transmission cabin fitting the cartilage inside the tragus and the earphone handle fitting the skull at the intertragmic notch.

[0024] In a second aspect, the application provides a bone conduction earphone, comprising an earphone main body and a fixing structure for fixing the earphone main body on the ear; wherein,

[0025] The earphone main body comprises a transmission cabin connected with the fixing structure;

[0026] The transmission cabin comprises a transmission cabin shell and a bone conduction vibrator arranged in the transmission cabin shell;

[0027] The bone conduction vibrator comprises a stator, a mover and an elastic sheet;

[0028] The stiffness coefficient k2 of the elastic sheet is in a monotonous positive correlation with in a monotonous linear positive correlation, ωt1 and ω t2 target resonance frequency;

[0029] The stiffness coefficient k2 of the elastic sheet is in a monotonous negative correlation with k1+k3, k1 is the stiffness coefficient formed by connecting the vibration transmission cabin to the fixed structure, and k3 is the stiffness coefficient formed by the vibration transmission cabin fitting the ear.

[0030] The stiffness coefficient k2 of the elastic sheet is in a monotonous positive correlation with m1, m1 is the mass of the vibration transmission cabin shell, the stator, the elastic sheet and the fixed structure.

[0031] The stiffness coefficient k2 of the elastic sheet is in a monotonous positive correlation with m2, m2 is the mass of the mover.

[0032] Further, in the bone conduction earphone, the stiffness coefficient k2 of the elastic sheet is in a monotonous linear positive correlation with ω t1 2 + ω t2 2 Further, in the bone conduction earphone, the stiffness coefficient k2 of the elastic sheet is in a monotonous linear positive correlation with ω

[0033] The stiffness coefficient k2 of the elastic sheet is in a monotonous linear negative correlation with k1+k3.

[0034] The stiffness coefficient k2 of the elastic sheet is in a monotonous linear positive correlation with m1.

[0035] The stiffness coefficient k2 of the elastic sheet is in a monotonous linear positive correlation with m2.

[0036] Further, in the bone conduction earphone, the stiffness coefficient of the elastic sheet satisfies the following relationship:

[0037]

[0038] Further, in the bone conduction earphone, the bone conduction earphone is an ear-hanging bone conduction earphone.

[0039] The fixed structure is an ear-hanging.

[0040] k3 is the stiffness coefficient formed by the vibration transmission cabin fitting the ear cartilage and / or skull.

[0041] Further, in the bone conduction earphone, the bone conduction earphone is an ear-hanging bone conduction earphone.

[0042] The fixed structure is an ear-hanging.

[0043] k3 is the stiffness coefficient formed by the vibration transmission cabin fitting the ear cartilage and / or skull.

[0044] Further, in the bone conduction earphone, the fixed structure and the vibration transmission cabin are connected through a connecting structure.

[0045] m1 is the mass of the transmission cabin shell, the stator, the elastic sheet, the fixed structure and the connecting structure.

[0046] In a third aspect, the present application provides a bone conduction earphone, comprising an earphone main body and a contralateral cabin for cooperating with the earphone main body to fix the earphone main body on the ear; wherein,

[0047] The earphone main body comprises a transmission cabin connected with the contralateral cabin;

[0048] The transmission cabin comprises a transmission cabin shell and a bone conduction vibrator arranged in the transmission cabin shell;

[0049] The bone conduction vibrator comprises a stator, a mover and an elastic sheet;

[0050] The stiffness coefficient k2 of the elastic sheet and k1 are in a monotonous positive correlation, and k1 is the stiffness coefficient formed by the contralateral cabin connecting the transmission cabin; t1 t2 ω0 is the target resonance frequency;

[0051] The stiffness coefficient k2 of the elastic sheet and k1 are in a monotonous negative correlation, and k1 is the stiffness coefficient formed by the contralateral cabin connecting the transmission cabin;

[0052] The stiffness coefficient k2 of the elastic sheet and m1 are in a monotonous positive correlation, and m1 is the mass of the transmission cabin shell, the stator, the elastic sheet and the contralateral cabin;

[0053] The stiffness coefficient k2 of the elastic sheet and m2 are in a monotonous positive correlation, and m2 is the mass of the mover.

[0054] Further, in the bone conduction earphone, the stiffness coefficient k2 of the elastic sheet and ω0 are in a monotonous linear positive correlation; t1 2 +ω t2 2

[0055] The stiffness coefficient k2 of the elastic sheet and k1 are in a monotonous linear negative correlation;

[0056] The stiffness coefficient k2 of the elastic sheet and m1 are in a monotonous linear positive correlation;

[0057] The stiffness coefficient k2 of the elastic sheet and m2 are in a monotonous linear positive correlation.

[0058] Further, in the bone conduction earphone, the stiffness coefficient of the elastic sheet satisfies the following relationship:

[0059]

[0060] ​​​Further, the bone conduction earphone, the opposite side cabin and the transmission cabin are connected through the connecting structure.

[0061] m1 is the mass of the transmission cabin shell, the stator, the elastic sheet, the opposite side cabin and the connecting structure.

[0062] Compared with the prior art, the present application has the following beneficial effects:

[0063] The bone conduction earphone provided by the present application can accurately obtain the required stiffness coefficient of the elastic sheet by designing the stiffness coefficient of the elastic sheet according to the correlation between the stiffness coefficient of the elastic sheet and other parameters in the earphone, so as to ensure that the elastic sheet has excellent elastic performance, thereby ensuring the sound quality of the bone conduction vibrator and improving the use experience of the earphone.

[0064] The present application has other characteristics and advantages, which will be apparent or will be described in detail in the accompanying drawings and subsequent specific embodiments incorporated herein, which together serve to explain the specific principles of the present application. BRIEF DESCRIPTION OF DRAWINGS

[0065] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the accompanying drawings needed to be used in the embodiments or prior art description will be briefly introduced below. Obviously, the accompanying drawings in the following description are only some embodiments of the present application, and those skilled in the art can obtain other accompanying drawings according to these accompanying drawings without creative labor.

[0066] Figure 1 is a schematic diagram of the monotonic linear positive correlation between the stiffness coefficient k2 of the elastic sheet and m1 mentioned in the embodiment of the present application;

[0067] Figure 2 is a schematic diagram of the monotonic linear negative correlation between the stiffness coefficient k2 of the elastic sheet and m2 mentioned in the embodiment of the present application;

[0068] Figure 3 is a schematic diagram of the structure of the rod type bone conduction earphone mentioned in the embodiment of the present application;

[0069] Figure 4 is a schematic diagram of the structure of the rod type bone conduction earphone mentioned in the embodiment of the present application;

[0070] Figure 5 is a schematic diagram of the structure of the bean type bone conduction earphone mentioned in the embodiment of the present application;

[0071] Figure 6is the structural schematic view of the bean type bone conduction earphone mentioned in embodiment one of the present application;

[0072] Figure 7 is the vibration model schematic view of the bone conduction vibrator in the rod type bone conduction earphone mentioned in embodiment one of the present application when the earphone is worn;

[0073] Figure 8 is the vibration model schematic view of the bone conduction vibrator in the rod type bone conduction earphone mentioned in embodiment one of the present application when the earphone is worn;

[0074] Figure 9 is the structural schematic view of the ear hanging type bone conduction earphone mentioned in embodiment two of the present application;

[0075] Figure 10 is the structural schematic view of the ear hanging type bone conduction earphone mentioned in embodiment two of the present application;

[0076] Figure 11 is the structural schematic view of the ear support type bone conduction earphone mentioned in embodiment two of the present application;

[0077] Figure 12 is the structural schematic view of the ear support type bone conduction earphone mentioned in embodiment two of the present application;

[0078] Figure 13 is the vibration model schematic view of the bone conduction vibrator in the ear hanging type bone conduction earphone mentioned in embodiment two of the present application when the earphone is worn;

[0079] Figure 14 is the vibration model schematic view of the bone conduction vibrator in the ear hanging type bone conduction earphone mentioned in embodiment two of the present application when the earphone is worn;

[0080] Figure 15 is the vibration model schematic view of the bone conduction vibrator in the ear support type bone conduction earphone mentioned in embodiment two of the present application when the earphone is worn;

[0081] Figure 16 is the vibration model schematic view of the bone conduction vibrator in the ear support type bone conduction earphone mentioned in embodiment two of the present application when the earphone is worn;

[0082] Figure 17 is the structural schematic view of the clip ear type bone conduction earphone mentioned in embodiment three of the present application;

[0083] Figure 18 is the structural schematic view of the clip ear type bone conduction earphone mentioned in embodiment three of the present application;

[0084] Figure 19 is the vibration model schematic view of the bone conduction vibrator in the clip ear type bone conduction earphone mentioned in embodiment three of the present application when the earphone is worn;

[0085] Figure 20 is a vibration model schematic diagram of the bone conduction vibrator in the clip-on bone conduction earphone mentioned in Embodiment Three of the present application. DETAILED DESCRIPTION

[0086] To make the objects, technical solutions, and advantages of the embodiments of the present application clearer, the following will clearly and completely describe the technical solutions in the embodiments of the present application with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application but not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the scope of protection of the present application. In addition, those of ordinary skill in the art can know that, as technology develops and new scenarios appear, the technical solutions provided by the embodiments of the present application are also applicable to similar technical problems.

[0087] In the description of the present application, it should be understood that, unless otherwise defined, all the technical and scientific terms used in the present application have the same meanings as those commonly understood by those skilled in the art to which the present application belongs. In addition, any term used is only for the purpose of describing specific embodiments and is not intended to limit the present application.

[0088] In addition, in order to better illustrate the present application, numerous specific details are given in the specific embodiments below. Those skilled in the art should understand that the present application can also be implemented without some specific details. In some examples, methods, means, elements, and circuits that are well known to those skilled in the art are not described in detail in order to highlight the main ideas of the present application.

[0089] The technical solutions of the present application will be further described below with reference to the drawings and through specific embodiments.

[0090] Embodiment One

[0091] In view of the defects of the existing shell stiffness coefficient design technology, the present applicant, based on rich practical experience and professional knowledge in designing and manufacturing such products for many years, and with the use of theories, actively conducts research and innovation in order to create a technology that can solve the defects in the prior art, so that the shell stiffness coefficient design technology is more practical. After continuous research, design, and repeated trial and improvement of samples, the present application is finally created, which has practical value.

[0092] The embodiments of the present application provide a bone conduction earphone, which is a semi-ear-inserting bone conduction earphone without a fixed structure, comprising an earphone main body; wherein,

[0093] The earphone main body comprises a vibration transmission cabin and an earphone handle connected with the vibration transmission cabin;

[0094] The vibration transmission cabin comprises a vibration transmission cabin shell and a bone conduction vibrator arranged in the vibration transmission cabin shell;

[0095] The bone conduction vibrator comprises a stator, a mover and a spring piece;

[0096] The stiffness coefficient k2 of the spring piece is in a monotonically positive correlation with ω t1 and ω t2 is a target resonant frequency;

[0097] The stiffness coefficient k2 of the spring piece is in a monotonically negative correlation with k3, and k3 is a stiffness coefficient formed by the vibration transmission cabin and the earphone handle fitting the ear;

[0098] The stiffness coefficient k2 of the spring piece is in a monotonically positive correlation with m1, and m1 is the mass of the vibration transmission cabin shell, the stator, the spring piece and the earphone handle;

[0099] The stiffness coefficient k2 of the spring piece is in a monotonically negative correlation with m2, and m2 is the mass of the mover.

[0100] It should be noted that ω t1 and ω t2 are target resonant frequencies expected to be designed for the earphone, which are known, and the parameters of k3, m1 and m2 can be obtained by measurement.

[0101] In order to accurately design the stiffness coefficient of the spring piece, the parameters in the earphone which will affect the stiffness coefficient of the spring piece, i.e., the parameters in a correlation with the stiffness coefficient of the spring piece, are researched in the embodiment, and it is obtained that the stiffness coefficient of the spring piece is in a monotonically positive correlation with the target resonant frequencies ω t1 and ω t2 , in a monotonically negative correlation with the stiffness coefficient k3 formed by the vibration transmission cabin and the earphone handle fitting the ear, in a monotonically positive correlation with the mass m1 of the vibration transmission cabin shell, the stator, the spring piece and the earphone handle, and in a monotonically negative correlation with the mass m2 of the mover, so that when the stiffness coefficient of the spring piece is designed, only the correlation between the stiffness coefficient of the spring piece and the other parameters in the earphone mentioned above needs to be considered, and the required stiffness coefficient of the spring piece can be accurately obtained.

[0102] It can be understood that the bone conduction earphone in the embodiment can be only a single bone conduction earphone which is used alone, or can be a pair of bone conduction earphones in a TWS true wireless form or in a stereo wired bone conduction earphone form.

[0103] In the embodiment, the stiffness coefficient k2 of the spring piece is in a monotonically linear positive correlation with ;

[0104] The stiffness coefficient k2 of the elastic sheet is in a monotonous linear negative correlation with k3.

[0105] The stiffness coefficient k2 of the elastic sheet is in a monotonous linear positive correlation with m1.

[0106] The stiffness coefficient k2 of the elastic sheet is in a monotonous linear negative correlation with m2.

[0107] It should be noted that the monotonous linear positive correlation between the stiffness coefficient k2 of the elastic sheet and m1 is in the form of a curve as shown in FIG. 5A, and the monotonous linear negative correlation between the stiffness coefficient k2 of the elastic sheet and m2 is in the form of a curve as shown in FIG. 5B. Figure 1 Figure 2

[0108] It can be understood that, since the bone conduction earphone in the embodiment is a semi-in-ear bone conduction earphone without a fixed structure, such as a rod-type bone conduction earphone including a vibration transmission cabin and an earphone handle, or a bean-type bone conduction earphone including a vibration transmission cabin and an electronic cabin;

[0109] When the semi-in-ear bone conduction earphone without a fixed structure is a rod-type bone conduction earphone, as shown in FIG. 6A, correspondingly, when the vibration transmission cabin is attached to the ear, it is specifically attached to the cartilage at the inner side of the tragus, and when the earphone handle is attached to the ear, it is specifically attached to the skull at the intertragic notch. Figures 3-4

[0110] When the semi-in-ear bone conduction earphone without a fixed structure is a bean-type bone conduction earphone, as shown in FIG. 6B, correspondingly, when the vibration transmission cabin is attached to the ear, it is specifically attached to the cartilage at the inner side of the tragus, and when the electronic cabin is attached to the ear, it is specifically attached to the skull at the intertragic notch. Figures 5-6

[0111] Correspondingly, k3 is the stiffness coefficient formed by the vibration transmission cabin attached to the cartilage at the inner side of the tragus and the earphone handle attached to the skull at the intertragic notch.

[0112] In the embodiment, after comprehensively considering the correlation between the stiffness coefficient of the elastic sheet and other parameters in the earphone mentioned above, the stiffness coefficient k2 of the elastic sheet satisfies the following relationship:

[0113]

[0114] It should be noted that the above relationship only shows the geometric relationship and does not involve the calculation of unit dimension.

[0115] For the semi-in-ear bone conduction earphone without a fixed structure, taking the rod-type bone conduction earphone as an example, the vibration model of the bone conduction vibrator when the earphone is worn is as follows, and the force diagram is as shown in FIG. 7: Figure 7

[0116] ​​​​​Assuming the bone conduction oscillator is located in the transmission chamber, which is situated inside the tragus and conforms to the cartilage at the inner side of the tragus, and the earphone stem conforms to the skin and skull at the intertragus notch. Because the earphone lacks an additional elastic support structure, i.e., no fixing structure, the pre-pressure exerted by the transmission chamber on the skin is relatively small.

[0117] Assuming the vibration transmission chamber (stator of bone conduction oscillator + shell of vibration transmission chamber) forms a vibrating mass system m1=m shell +m t =m shell +m 传振舱 +m 耳机柄 ; where m shell It equals the stator mass of the oscillator itself, plus the outer cylinder mass of the oscillator itself, plus the spring mass of the oscillator itself. m t The mass of the vibration chamber excluding the oscillator itself, including the mass of the vibration chamber, is m. 传振舱 And the mass m of the headphone stem 耳机柄 Additionally, for ease of description, let m2 = m r =m 振子的动子 k2 = k s , where m r It is the mass of the mover part of the oscillator itself, k s It is the stiffness coefficient of the spring sheet of the oscillator itself. If it is a double-sided spring sheet oscillator design, then k s The sum of the spring constants of the two spring plates on the two surfaces, i.e., k s =k s1 +k s2 , where k s1 and k s2 These are the accuracy coefficient of the spring sheet on the first surface of the oscillator and the stiffness coefficient on the second surface of the oscillator, respectively.

[0118] Assuming that the dynamic relationship between the cartilage on the inner side of the tragus of the vibration chamber and the skull at the notch between the earphone stem and the tragus, including the skin and muscles of the corresponding area, and the overall headphone can be considered as a spring-damped system, with a spring constant of k3 and a damping constant of c3.

[0119] For ease of description in subsequent equations, this embodiment uses the preceding force diagram, i.e. Figure 7 Modify it into the following two-degree-of-freedom mechanical vibration model, such as... Figure 8 As shown.

[0120] Through force analysis, the vibration equation of the above system can be obtained as follows:

[0121]

[0122] in,

[0123]

[0124]

[0125]

[0126]

[0127] Let

[0128] where, f r is the electromagnetic interaction force between the moving stator.

[0129] Solving the vibration equation, the equation corresponding to the system resonance frequency is:

[0130] m1m2ω 4 -(k3m2+(m1+m2)k2)ω 2 +k3k2=0;

[0131] Solving the quadratic equation has:

[0132]

[0133] From the above, the bone conduction vibrator system has at least two resonance frequency points.

[0134] Assuming the target resonance frequency of the bone conduction earphone is ω t1 and ω t2 , how to choose the stiffness coefficient k2 of the spring piece should be set?

[0135] The above formula can be used to design the stiffness coefficient value of the spring piece in reverse through the target resonance frequency, that is, assuming the target resonance frequency is ω t1 and ω t2 , assuming ω t1 ≤ω t2 , then:

[0136]

[0137] where, assuming k3, m1, m2 belong to the known parameters obtained by measurement, then:

[0138]

[0139] Further calculation has:

[0140]

[0141] The difference between ω t2 and ω t1 can also be used to solve, that is:

[0142]

[0143] Further calculations show:

[0144]

[0145] By further solving the quadratic equation of k2 above, we can also obtain the value of k2.

[0146] In summary, we can conclude that if the target resonant frequency is known to be ω... t1 and ω t2 And assuming that k3, m1, and m2 are known parameters obtained through measurement, then we can conclude that k2 is some function of the above parameters, i.e.:

[0147] k2=f(k3,m1,m2,ω t1 ω t2 ).

[0148] Although this application frequently uses terms such as oscillator, spring, stiffness coefficient, resonant frequency, and correlation, the possibility of using other terms is not excluded. These terms are used merely for the convenience of describing and explaining the essence of the invention; interpreting them as any additional limitation would contradict the spirit of the invention.

[0149] This invention provides a bone conduction headphone. By designing the stiffness coefficient of the spring based on the correlation between other parameters in the headphone and the stiffness coefficient of the spring, the required stiffness coefficient of the spring can be accurately obtained, ensuring that the spring has better elastic performance, thereby ensuring the sound quality of the bone conduction oscillator. This is of great significance for improving the user experience of the headphone and has good practicality.

[0150] Example 2

[0151] This invention provides a bone conduction headphone, which is a non-in-ear bone conduction headphone with a fixed structure, including a headphone body and a fixing structure for fixing the headphone body to the ear; wherein,

[0152] The headphone body includes a vibration transmission chamber connected to the fixed structure;

[0153] The vibration transmission chamber includes a vibration transmission chamber shell and a bone conduction oscillator disposed within the vibration transmission chamber shell.

[0154] The bone conduction oscillator includes a stator, a mover, and a spring.

[0155] The spring constant k2 of the spring is They show a monotonically positive correlation, ω t1 and ω t2 The target resonant frequency;

[0156] The stiffness coefficient k2 of the elastic sheet is in a monotonous negative correlation with k1+k3, k1 is a stiffness coefficient formed by connecting the transmission cabin to the fixed structure, and k3 is a stiffness coefficient formed by the transmission cabin fitting the ear;

[0157] The stiffness coefficient k2 of the elastic sheet is in a monotonous positive correlation with m1, m1 is the mass of the transmission cabin shell, the stator, the elastic sheet and the fixed structure;

[0158] The stiffness coefficient k2 of the elastic sheet is in a monotonous negative correlation with m2, m2 is the mass of the mover.

[0159] It should be noted that ω t1 and ω t2 are target resonance frequencies expected to be designed for the earphone, which are known, and the parameters of k1, k3, m1 and m2 can be obtained by measurement.

[0160] In order to accurately design the stiffness coefficient of the elastic sheet, the parameters in the earphone that will affect the stiffness coefficient of the elastic sheet, i.e., the parameters in a correlation relationship, are researched in the embodiment, and it is concluded that the stiffness coefficient of the elastic sheet is in a monotonous positive correlation with the target resonance frequencies ω t1 and ω t2 , in a monotonous negative correlation with the stiffness coefficient k1 formed by connecting the transmission cabin to the fixed structure, in a monotonous negative correlation with the stiffness coefficient k3 formed by the transmission cabin fitting the ear, in a monotonous positive correlation with the mass m1 of the transmission cabin shell, the stator, the elastic sheet and the fixed structure, and in a monotonous negative correlation with the mass m2 of the mover. Therefore, when designing the stiffness coefficient of the elastic sheet, only the correlation relationship between the stiffness coefficient of the elastic sheet and the other parameters in the earphone mentioned above needs to be considered, and the required stiffness coefficient of the elastic sheet can be accurately obtained.

[0161] It can be understood that the bone conduction earphone in the embodiment can be only a single bone conduction earphone, which is used alone, or can be a pair of bone conduction earphones in a TWS true wireless form or a stereo wired bone conduction earphone form.

[0162] In the embodiment, the stiffness coefficient k2 of the elastic sheet is in a monotonous linear positive correlation with ;

[0163] The stiffness coefficient k2 of the elastic sheet is in a monotonous linear negative correlation with k1+k3;

[0164] The stiffness coefficient k2 of the elastic sheet is in a monotonous linear positive correlation with m1;

[0165] The stiffness coefficient k2 of the elastic sheet is in a monotonous linear positive correlation with m2.

[0166] It should be noted that the monotonic linear positive correlation between the stiffness coefficient k2 of the elastic sheet and m1 is in the form of a curve as shown in FIG. 2, and the monotonic linear negative correlation between the stiffness coefficient k2 of the elastic sheet and m2 is in the form of a curve as shown in FIG. 3. Figure 1 It should be noted that the monotonic linear positive correlation between the stiffness coefficient k2 of the elastic sheet and m1 is in the form of a curve as shown in FIG. 2, and the monotonic linear negative correlation between the stiffness coefficient k2 of the elastic sheet and m2 is in the form of a curve as shown in FIG. 3. Figure 2 It should be noted that the monotonic linear positive correlation between the stiffness coefficient k2 of the elastic sheet and m1 is in the form of a curve as shown in FIG. 2, and the monotonic linear negative correlation between the stiffness coefficient k2 of the elastic sheet and m2 is in the form of a curve as shown in FIG. 3.

[0167] It can be understood that, since the bone conduction earphone in the embodiment has a fixed structure, it is a non-ear-inserting bone conduction earphone, such as an ear-hanging bone conduction earphone, an ear-supporting bone conduction earphone, etc.

[0168] When the bone conduction earphone with a fixed structure is an ear-hanging bone conduction earphone, as shown in FIG. 4, correspondingly, the fixed structure is an ear-hanging structure, and the vibration cabin is attached to the ear cartilage and / or skull when the earphone is worn. Figures 9-10

[0169] Correspondingly, k3 is the stiffness coefficient formed by the vibration cabin attached to the ear cartilage and / or skull.

[0170] When the bone conduction earphone with a fixed structure is an ear-hanging bone conduction earphone, as shown in FIG. 4, correspondingly, the fixed structure is an ear-hanging structure, and the vibration cabin is attached to the ear cartilage and / or skull when the earphone is worn. Figures 11-12

[0171] Correspondingly, k3 is the stiffness coefficient formed by the vibration cabin attached to the ear cartilage and / or skull.

[0172] In the embodiment, the fixed structure can be directly connected to the vibration cabin, or connected through a connecting structure. If connected through a connecting structure, the mass of the connecting structure needs to be added to m1, that is:

[0173] Correspondingly, m1 is the mass of the vibration cabin shell, the stator, the elastic sheet, the fixed structure, and the connecting structure.

[0174] In the embodiment, after comprehensively considering the relationship between the stiffness coefficient of the elastic sheet and other parameters in the above-mentioned earphone, the stiffness coefficient of the elastic sheet satisfies the following relationship:

[0175]

[0176] It should be noted that the above relationship only shows the geometric relationship and does not involve the calculation of unit dimension.

[0177] For the bone conduction earphone with a fixed structure, such as an ear-hanging bone conduction earphone, the vibration model of the bone conduction vibrator when the earphone is worn is as follows, and the force diagram is as shown in FIG. 5: Figure 13 ​​​

[0178] Assume the vibrator is placed on the earphone ear hook, and the vibrator is attached to the ear cartilage or skull. Assume that the ear hook and the skull / cartilage can be approximated as a spring system with damping.

[0179] At this time, the vibrator outer cylinder is fixed in the vibration cabin, the vibration cabin is fixed on the ear hook, and the ear hook is fixed on the rear neck strap. Assume that the vibration cabin (stator of the vibrator + vibration cabin shell) forms a vibrating mass system m1 = m 振子的定子 +m 振动舱壳体 = m shell +m t ; where m t is the mass of the vibration cabin shell. In addition, assume that the elastic damping structure of the earphone, i.e., the stiffness coefficient k1 formed by the fixed structure (ear hook) and the damping coefficient c1. In addition, for convenience of description, let m2 = m r , k2 = k s . If it is the design of a double-sided spring vibrator, then k s The sum of the stiffness coefficients of the springs on the two sides, i.e., k s = k s1 + k s2 , where k s1 and k s2 are the stiffness coefficients of the springs on the first and second sides of the vibrator, respectively.

[0180] At this time, the vibration cabin attached to the ear cartilage / skull including the skin muscle can also be regarded as a spring damping system with a stiffness coefficient k3 and a damping coefficient c3.

[0181] For convenience of subsequent equation description, the previous force diagram, i.e., Figure 13 , is modified to the mechanical vibration model of the following two-degree-of-freedom model, as shown in Figure 14 .

[0182] Through force analysis, the vibration equation of the above system can be obtained as follows:

[0183]

[0184] where,

[0185]

[0186]

[0187]

[0188]

[0189] Let

[0190] where f r is the electromagnetic interaction force between the moving stator and the stationary stator.

[0191] Solving the vibration equation, the equation corresponding to the system resonance frequency is:

[0192] m1m2ω 4 -((k1+k3)m2+(m1+m2)k2)ω 2 +(k1+k3)k2=0;

[0193] Solving the quadratic equation has:

[0194]

[0195] From the above, the bone conduction vibrator system has at least two resonance frequency points.

[0196] Assuming the target resonance frequency of the bone conduction earphone is ω t1 and ω t2 , how to choose the stiffness coefficient k2 of the spring should be set?

[0197] The above formula can be used to design the stiffness coefficient value of the spring by the target resonance frequency, that is, assuming the target resonance frequency is ω t1 and ω t2 , assuming ω t1 ≤ω t2 , then:

[0198]

[0199] where, assuming k1, k3, m1, m2 are known parameters obtained by measurement, then:

[0200]

[0201] Further, there is:

[0202]

[0203] The difference between ω t2 and ω t1 can also be used to solve, that is:

[0204]

[0205] Further calculation has:

[0206]

[0207] Further solving the above quadratic equation of k2, the value of k2 can also be obtained.

[0208] From the above, if the target resonant frequency is known as ω t1 and ω t2 , and assuming that k1, k3, m1, m2 are known parameters obtained by measurement. Then it can be obtained that k2 is a certain function of the above parameters, i.e.:

[0209] k2 = f(k1, k3, m1, m2, ω t1 , ω t2 ).

[0210] For the ear-hanging bone conduction earphone with fixed structure, such as the ear-hanging bone conduction earphone, the vibration model of the bone conduction vibrator when the earphone is worn is as follows, and the force diagram is as shown in Figure 15

[0211] It is assumed that the vibrator is located in the vibration transmission cabin, and the vibration transmission cabin is located at the cartilage inside the tragus or is attached to the cartilage in the concha.

[0212] Taking the fixed structure of the horn structure as an example, there are two possibilities, one is an angular cabin, and the other is an angular ear-hanging. The horn structure has a horn tip inserted into the concha to fix the entire vibration transmission cabin. At the same time, the horn structure forms a pre-pressure in the plane close to the vertical plane of the auricle, so that the vibration transmission cabin is deeper into the inside of the tragus and is pressed against the cartilage wall in front of the entrance of the external auditory canal.

[0213] When the vibration transmission cabin generates vibration in the Z-axis (close to the vertical plane of the right auricle, or the plane of left-right symmetry of the body) direction, the horn structure causes the pressure of the vibration transmission cabin on the cartilage wall in front of the entrance of the external auditory canal to generate a friction force in the Z-axis direction. The friction force has two effects, one effect is to make the skin and muscles of the cartilage wall in front of the entrance of the external auditory canal produce a Z-axis direction movement, forming a vibration system similar to a spring-mass structure, and assuming that the stiffness coefficient of the system is k1 and the damping is c1. On the other hand, whether it is static friction without relative motion or dynamic friction with relative motion between the cartilage wall in front of the entrance of the external auditory canal and the vibrator, the cartilage wall in front of the entrance of the external auditory canal forms a reverse friction force for the vibration transmission cabin, which is assumed to be f μ .

[0214] At this time, the outer cylinder of the vibrator itself is fixed in the vibration transmission cabin of the earphone, and the horn structure (or angular cabin, or angular ear-hanging, etc.) is directly connected with the vibration transmission cabin or connected through a connecting structure. It is assumed that the vibration transmission cabin (vibrator stator + vibration transmission cabin + horn structure) forms a vibration mass system m1 = m shell + mt = mshell + m 传振舱 + m 牛角结构 ; wherein, m shell ​m = m1 + m2 + m3 t m = m1 + m2 + m3 传振舱 m = m1 + m2 + m3 牛角结构 m = m1 + m2 + m3 连接件 m = m1 + m2 + m3 r m = m1 + m2 + m3 振子动子 m = m1 + m2 + m3 s m = m1 + m2 + m3 r m = m1 + m2 + m3 s m = m1 + m2 + m3 s m = m1 + m2 + m3 s m = m1 + m2 + m3 s1 m = m1 + m2 + m3 s2 m = m1 + m2 + m3 s1 m = m1 + m2 + m3 s2 m = m1 + m2 + m3 m = m1 + m2 + m3

[0215] m = m1 + m2 + m3 m = m1 + m2 + m3

[0216] m = m1 + m2 + m3 Figure 15 m = m1 + m2 + m3 Figure 16 m = m1 + m2 + m3 m = m1 + m2 + m3

[0217] m = m1 + m2 + m3 m = m1 + m2 + m3

[0218] m = m1 + m2 + m3 m = m1 + m2 + m3 m = m1 + m2 + m3

[0219] m = m1 + m2 + m3 m = m1 + m2 + m3

[0220] m = m1 + m2 + m3 m = m1 + m2 + m3

[0221] m = m1 + m2 + m3 m = m1 + m2 + m3 m = m1 + m2 + m3

[0222] m = m1 + m2 + m3 m = m1 + m2 + m3 m = m1 + m2 + m3

[0223] m = m1 + m2 + m3 m = m1 + m2 + m3 m = m1 + m2 + m3

[0224] m = m1 + m2 + m3 m = m1 + m2 + m3 m = m1 + m2 + m3

[0225] m = m1 + m2 + m3 m = m1 + m2 + m3 m = m1 + m2 + m3

[0226] where f r is the electromagnetic interaction force between the moving stator and the static stator. f μ is the lateral force generated by the lateral wall of the tragus and the medial wall of the concha to the vibration of the vibrator, which is perpendicular to the vibration direction of the vibrator.

[0227] Solving the vibration equation, the equation corresponding to the system resonance frequency is obtained as:

[0228] m1m2ω 4 -((k1+k3)m2+(m1+m2)k2)ω 2 +(k1+k3)k2=0;

[0229] Solving the quadratic equation has:

[0230]

[0231] From the above, the bone conduction vibrator system has at least two resonance frequency points.

[0232] Assuming that the target resonance frequency of the bone conduction earphone is ω t1 and ω t2 , how to select the stiffness coefficient k2 of the elastic sheet should be set?

[0233] The above formula can be used to design the stiffness coefficient value of the elastic sheet by the target resonance frequency, that is, assuming that the target resonance frequency is ω t1 and ω t2 , assuming ω t1 ≤ω t2 , then:

[0234]

[0235] where, assuming that k1, k3, m1, m2 belong to the known parameters obtained by measurement, then:

[0236]

[0237] Further, it can be calculated that:

[0238]

[0239] The difference between ω t2 and ω t1 can also be used to solve, that is:

[0240]

[0241] Further calculation has:

[0242]

[0243] Further solving the above k2 monomial quadratic equation, the value of k2 can also be obtained.

[0244] In summary, if the target resonant frequency ω t1 and ω t2 , and assuming that k1, k3, m1, m2 belong to the known parameters obtained by measurement. Then k2 can be obtained as a function of the above parameters, that is:

[0245] k2=f(k1,k3,m1,m2,ω t1 ,ω t2 ).

[0246] The bone conduction earphone provided by the application can accurately obtain the required stiffness coefficient of the elastic sheet by designing the stiffness coefficient of the elastic sheet according to the correlation between other parameters in the earphone and the stiffness coefficient of the elastic sheet, so as to ensure that the elastic sheet has excellent elastic performance, thereby ensuring the sound quality of the bone conduction vibrator, and having important significance for improving the use experience of the earphone and good practicability.

[0247] Embodiment three

[0248] The embodiment of the application provides a bone conduction earphone, which is another non-in-ear bone conduction earphone different from the embodiment two, comprising an earphone main body and a contralateral cabin used for cooperating with the earphone main body to fix the earphone main body on the ear; wherein,

[0249] The earphone main body comprises a vibration transmission cabin connected with the contralateral cabin;

[0250] The vibration transmission cabin comprises a vibration transmission cabin shell and a bone conduction vibrator arranged in the vibration transmission cabin shell;

[0251] The bone conduction vibrator comprises a stator, a mover and an elastic sheet;

[0252] The stiffness coefficient k2 of the elastic sheet and are in a monotone positive correlation, ω t1 and ω t2 are target resonant frequencies;

[0253] The stiffness coefficient k2 of the elastic sheet and k1 are in a monotone negative correlation, and k1 is the stiffness coefficient formed by the connection of the contralateral cabin and the vibration transmission cabin;

[0254] The stiffness coefficient k2 of the elastic sheet and m1 are in a monotone positive correlation, and m1 is the mass of the vibration transmission cabin shell, the stator, the elastic sheet and the contralateral cabin;

[0255] The stiffness coefficient k2 of the elastic sheet and m2 are in a monotone positive correlation, and m2 is the mass of the mover.

[0256] It should be noted that ω t1 and ω t2 These are the target resonant frequencies that the headphones are intended to resonate at, and they are known, while parameters such as k1, m1, and m2 can be obtained through measurement.

[0257] In order to accurately design the spring coefficient, this embodiment studies the parameters in the earphone that affect the spring coefficient, i.e., the two are correlated, and concludes that the spring coefficient is related to the target resonant frequency ω. t1 and ω t2 The spring coefficient exhibits a monotonically positive correlation with the stiffness coefficient k1 formed by the fixed structure connecting the vibration transmission chamber, a monotonically negative correlation with the mass m1 of the vibration transmission chamber shell, stator, spring, and opposite chamber, and a monotonically negative correlation with the mass m2 of the mover. Therefore, when designing the stiffness coefficient of the spring, it is only necessary to comprehensively consider the correlation between the stiffness coefficient of the spring and the other parameters mentioned above in the headphone to accurately obtain the required stiffness coefficient of the spring.

[0258] It is understood that the bone conduction headphones in this embodiment may be a single bone conduction headphone, which can be worn and used alone, or they may be a pair of two bone conduction headphones forming a TWS true wireless form or a stereo wired bone conduction headphone form.

[0259] In this embodiment, the spring constant k2 of the spring is related to ω. t1 2 +ω t2 2 They exhibit a monotonic linear positive correlation.

[0260] The spring constant k2 and k1 of the spring piece have a monotonically linear negative correlation.

[0261] The spring constant k2 of the spring piece is monotonically linearly positively correlated with m1;

[0262] The spring constant k2 of the spring piece is monotonically linearly positively correlated with m2.

[0263] It should be noted that the monotonically linear positive correlation between the spring constant k2 and m1 is as follows: Figure 1 The curve shape shown indicates a monotonically linear negative correlation between the spring constant k2 and m2. Figure 2 The curve shape shown.

[0264] The bone conduction headphones described in this embodiment are clip-on bone conduction headphones.

[0265] like Figures 17-18As shown, when the vibration transmission cabin is attached to the ear, it is specifically attached to the antihelix or the antitragus or the cartilage at the notch of the antitragus.

[0266] In this embodiment, the opposite cabin can be directly connected with the vibration transmission cabin, or connected through a connecting structure. If connected through a connecting structure, m1 needs to add the mass of the connecting structure, that is:

[0267] Correspondingly, m1 is the mass of the vibration transmission cabin shell, the stator, the elastic sheet, the opposite cabin and the connecting structure.

[0268] In this embodiment, after comprehensively considering the relationship between the stiffness coefficient of the elastic sheet and other parameters mentioned above in the earphone, the stiffness coefficient of the elastic sheet satisfies the following relationship:

[0269]

[0270] It should be noted that the above relationship only shows the geometric relationship and does not involve the calculation of unit dimension.

[0271] For the ear-clamping bone conduction earphone, the vibration model of the bone conduction vibrator when the earphone is worn is as follows, and the force diagram is as shown in Figure 19 :

[0272] It is assumed that the vibrator is located in the vibration transmission cabin, which can be attached to the inner side of the auricle or the outer side of the auricle. The attached part of the auricle is the antihelix, or the antitragus, or the cartilage of the antihelix. At this time, on the one hand, the cartilage of the auricle forms a support structure for the vibration transmission cabin, which can be regarded as a spring-damping vibration system.

[0273] In addition, at this time, the skin, muscle and cartilage of the auricle part attached by the vibration transmission cabin have symmetrical pre-pressures on both sides because they are ear-clamping type, and the resultant force is zero at rest. Therefore, the skin, muscle and cartilage of the attached part cannot be regarded as a single-side forced spring-damping system at this time.

[0274] At this time, the outer cylinder of the vibrator itself is fixed in the earphone vibration transmission cabin, and the vibration transmission cabin and the opposite structure (which can be a cabin with a battery or a circuit board, etc.) clamp the cartilage on the auricle. It is assumed that the vibration transmission cabin (vibrator stator + vibration transmission cabin + opposite cabin + connecting structure + part of the mass of the auricle that vibrates together) forms a vibration mass system m1=m shell +m t +m c =m shell +m 传振舱 +m 对侧舱 +m 连接件 +m 同振耳廓 ; wherein m shellIt equals the stator mass of the oscillator itself, plus the outer cylinder mass of the oscillator itself, plus the spring mass of the oscillator itself. m t The mass of the vibration chamber excluding the oscillator itself, including the mass of the vibration chamber, is m. 传振舱 In addition to the mass m of the side cabin 对侧舱 In addition to the mass m of the connecting structure between the vibration chamber and the opposite chamber, 连接件 Additionally, it's necessary to consider that a portion of the auricle's mass vibrates along with the vibration transmission chamber; therefore, the mass m of this co-vibrating auricle also needs to be added. 同振耳廓 .

[0275] For ease of description, let m2 = m r =m 振子动子 k2 = k s , where m r It is the mass of the mover part of the oscillator itself, k s It is the stiffness coefficient of the spring sheet of the oscillator itself. If it is a double-sided spring sheet oscillator design, then k s The sum of the spring constants of the two spring plates on the two surfaces, i.e., k s =k s1 +k s2 , where k s1 and k s2 These are the accuracy coefficient of the spring sheet on the first surface of the oscillator and the stiffness coefficient on the second surface of the oscillator, respectively.

[0276] For the sake of convenience in describing the subsequent equations, the force diagram from before will be used instead. Figure 19 Modify it into the following two-degree-of-freedom mechanical vibration model, such as... Figure 20 As shown.

[0277] Through force analysis, the vibration equation of the above system can be obtained as follows:

[0278]

[0279] in,

[0280]

[0281]

[0282]

[0283]

[0284] make

[0285] Among them, f r It is the electromagnetic interaction force between the moving and stating elements.

[0286] Solving the vibration equation, the equation corresponding to the system resonance frequency is:

[0287] m1m2ω 4 -(k1m2+(m1+m2)k2)ω 2 +k1k2=0;

[0288] Solving a quadratic equation has:

[0289]

[0290] From the above, the bone conduction vibrator system has at least two resonance frequency points.

[0291] Assuming the target resonance frequency of the bone conduction earphone is ω t1 and ω t2 , how to choose the stiffness coefficient k2 of the elastic sheet should be set?

[0292] The above formula can be used to design the stiffness coefficient value of the elastic sheet by the target resonance frequency, that is, assuming the target resonance frequency is ω t1 and ω t2 , assuming ω t1 ≤ω t2 , then:

[0293]

[0294] Among them, assuming k1, m1, m2 belong to the known parameters obtained by measurement, then:

[0295]

[0296] Further calculation has:

[0297]

[0298] Also can be solved by the difference between ω t2 and ω t1 , that is:

[0299]

[0300] Further calculation has:

[0301]

[0302] Further solving the above k2 quadratic equation, the value of k2 can also be obtained.

[0303] Comprehensive above, if the known target resonance frequency is ω t1 and ω t2and assume that k1, m1, m2 are known parameters obtained by measurement. Then it can be obtained that k2 is a certain function of the above parameters, i.e.

[0304] k2 = f9k1, m1, m2, ω t1 , ω t2 ).

[0305] The bone conduction earphone provided by the application can accurately obtain the required stiffness coefficient of the elastic sheet by designing the stiffness coefficient of the elastic sheet according to the correlation between the stiffness coefficient of the elastic sheet and other parameters in the earphone, so that the elastic sheet has better elastic performance, the sound quality of the bone conduction vibrator is ensured, and the use experience of the earphone is improved, and the bone conduction earphone has good practicability.

[0306] In summary, after reading the detailed disclosure, those skilled in the art can understand that the foregoing detailed disclosure can be presented only in an exemplary manner and can not be limiting. Although not explicitly stated herein, those skilled in the art can understand that the present application intends to encompass various reasonable changes, improvements and modifications to the embodiments. These changes, improvements and modifications are intended to be presented by the present application and are within the spirit and scope of the exemplary embodiments of the present application.

[0307] In addition, certain terms have been used in the present application to describe embodiments of the present application. For example, "one embodiment", "an embodiment" and / or "some embodiments" means that a particular feature, structure or characteristic described in connection with the embodiment can be included in at least one embodiment of the present application. Therefore, it can be emphasized and should be understood that the references to "the embodiment" or "one embodiment" or "alternative embodiments" in various parts of the specification do not necessarily all refer to the same embodiment. In addition, a particular feature, structure or characteristic can be appropriately combined in one or more embodiments of the present application.

[0308] It should be understood that, in the foregoing description of embodiments of the present application, for the purpose of helping to understand one feature, the present application combines various features in a single embodiment, figure or its description for the purpose of simplifying the present application. However, this does not mean that the combination of these features is necessary, and those skilled in the art can completely extract a part of the features as a separate embodiment when reading the present application. That is, the embodiments in the present application can also be understood as the integration of multiple secondary embodiments. And the content of each secondary embodiment is also valid when there are less than all the features of a single foregoing disclosed embodiment.

[0309] Finally, it should be understood that the embodiments of the application disclosed herein are illustrative of the principles of the present application. Other modifications that are obvious within the spirit and principles of the application are encompassed within the scope of the application. Accordingly, the disclosure of embodiments of the application is intended to be illustrative, but not limiting, of the scope of the application. Those of skill in the art could readily devise their own modifications to the specific embodiments disclosed within the scope of the application. Accordingly, the disclosure of embodiments of the application is intended to be illustrative, but not limiting, of the scope of the application.

Claims

1. A bone conduction headphone, characterized in that, Including the main body of the headphones; among which, The headphone body includes a vibration transmission chamber and a headphone stem connected to the vibration transmission chamber; The vibration transmission chamber includes a vibration transmission chamber shell and a bone conduction oscillator disposed within the vibration transmission chamber shell. The bone conduction oscillator includes a stator, a mover, and a spring. The spring constant k2 of the spring is They show a monotonically positive correlation, ω t1 and ω t2 The target resonant frequency; The spring force coefficients k2 and k3 are monotonically negatively correlated, where k3 is the spring force coefficient formed by the vibration transmission chamber and the earphone stem fitting against the ear. The spring constant k2 of the spring piece is monotonically positively correlated with m1, where m1 is the mass of the vibration transmission chamber shell, the stator, the spring piece, and the earphone stem. The spring constant k2 of the spring piece is monotonically positively correlated with m2, where m2 is the mass of the mover.

2. The bone conduction headphones according to claim 1, characterized in that, The spring constant k2 and ω of the spring piece t1 2 +ω t2 2 They exhibit a monotonic linear positive correlation. The spring constants k2 and k3 of the spring sheet are monotonically linearly negatively correlated. The spring constant k2 of the spring piece is monotonically linearly positively correlated with m1; The spring constant k2 of the spring piece is monotonically linearly positively correlated with m2.

3. The bone conduction headphones according to claim 1 or 2, characterized in that, The spring constant k2 of the spring sheet satisfies the following relationship:

4. The bone conduction headphones according to claim 1, characterized in that, The bone conduction headphones are semi-in-ear bone conduction headphones; k3 is the stiffness coefficient formed by the cartilage at the inner side of the tragus of the vibration chamber and the skull at the notch between the tragus and the earphone stem.

5. A bone conduction headphone, characterized in that, It includes an earphone body and a fixing structure for securing the earphone body to the ear; wherein, The headphone body includes a vibration transmission chamber connected to the fixed structure; The vibration transmission chamber includes a vibration transmission chamber shell and a bone conduction oscillator disposed within the vibration transmission chamber shell. The bone conduction oscillator includes a stator, a mover, and a spring. The spring constant k2 of the spring is They show a monotonically positive correlation, ω t1 and ω t2 The target resonant frequency; The stiffness coefficient k2 of the spring piece is monotonically negatively correlated with k1+k3, where k1 is the stiffness coefficient formed by the connection between the fixed structure and the vibration transmission chamber, and k3 is the stiffness coefficient formed by the vibration transmission chamber fitting against the ear. The stiffness coefficient k2 of the spring piece is monotonically positively correlated with m1, where m1 is the mass of the vibration transmission chamber shell, the stator, the spring piece, and the fixed structure. The spring constant k2 of the spring piece is monotonically positively correlated with m2, where m2 is the mass of the mover.

6. The bone conduction headphones according to claim 5, characterized in that, The spring constant k2 and ω of the spring piece t1 2 +ω t2 2 They exhibit a monotonic linear positive correlation. The spring constant k2 of the spring piece has a monotonically linear negative correlation with k1+k3; The spring constant k2 of the spring piece is monotonically linearly positively correlated with m1; The spring constant k2 of the spring piece is monotonically linearly positively correlated with m2.

7. The bone conduction headphones according to claim 5 or 6, characterized in that, The spring constant of the spring sheet satisfies the following relationship:

8. The bone conduction headphones according to claim 5, characterized in that, The bone conduction headphones are ear-hook type bone conduction headphones. The fixing structure is an ear hook; k3 is the stiffness coefficient formed by the vibration transmission chamber conforming to the ear cartilage and / or skull.

9. The bone conduction headphones according to claim 5, characterized in that, The bone conduction headphones are ear-support type bone conduction headphones; The fixing structure is an ear support; k3 is the stiffness coefficient formed by the cartilage of the vibration transmission chamber fitting into the concha cavity and the cymba conchae.

10. The bone conduction headphones according to claim 5, characterized in that, The fixed structure and the vibration transmission chamber are connected by a connecting structure; m1 is the mass of the vibration transmission chamber shell, the stator, the spring sheet, the fixing structure, and the connecting structure.

11. A bone conduction headphone, characterized in that, It includes an earphone body and a contralateral housing for cooperating with the earphone body to secure the earphone body to the ear; wherein, The headphone body includes a vibration transmission chamber connected to the opposite side chamber; The vibration transmission chamber includes a vibration transmission chamber shell and a bone conduction oscillator disposed within the vibration transmission chamber shell. The bone conduction oscillator includes a stator, a mover, and a spring. The spring constant k2 of the spring is They show a monotonically positive correlation, ω t1 and ω t2 The target resonant frequency; The stiffness coefficient k2 of the spring piece is monotonically negatively correlated with k1, where k1 is the stiffness coefficient formed by the connection between the opposite side chamber and the vibration transmission chamber. The stiffness coefficient k2 of the spring piece is monotonically positively correlated with m1, where m1 is the mass of the vibration transmission chamber shell, the stator, the spring piece, and the opposite chamber. The spring constant k2 of the spring piece is monotonically positively correlated with m2, where m2 is the mass of the mover.

12. The bone conduction headphones according to claim 11, characterized in that, The spring constant k2 and ω of the spring piece t1 2 +ω t2 2 They exhibit a monotonic linear positive correlation. The spring constant k2 and k1 of the spring piece have a monotonically linear negative correlation. The spring constant k2 of the spring piece is monotonically linearly positively correlated with m1; The spring constant k2 of the spring piece is monotonically linearly positively correlated with m2.

13. The bone conduction headphones according to claim 11 or 12, characterized in that, The spring constant of the spring sheet satisfies the following relationship:

14. The bone conduction headphones according to claim 11, characterized in that, The opposite side chamber and the vibration transmission chamber are connected by a connecting structure; m1 represents the mass of the vibration transmission chamber shell, the stator, the spring sheet, the opposite side chamber, and the connecting structure.

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