Glasses

Abstract

Embodiments of the present description provide a pair of glasses, comprising: sound-producing devices, wherein each sound-producing device comprises a diaphragm and a magnetic circuit assembly, a front cavity is formed on the side of the diaphragm facing away from the magnetic circuit assembly, and a back cavity is formed on the side of the diaphragm facing toward the magnetic circuit assembly; temples, wherein the temples accommodate the sound-producing devices, each temple is provided with a sound outlet hole and a pressure relief hole, the sound outlet hole is communicated with the corresponding back cavity, the pressure relief hole is communicated with the corresponding front cavity, and in a worn state, the sound outlet hole is closer to an ear canal opening of a user than the pressure relief hole, and the opening area of the sound outlet hole is greater than that of the pressure relief hole; and a frame connected to the temples.

Description

A type of eyeglasses Technical Field

[0001] This manual relates to the field of eyewear technology, and in particular to eyewear with audio playback functionality. Background Technology

[0002] In modern life, glasses with audio playback capabilities are gaining popularity. Especially with the development of AR / VR glasses, functions such as real-time translation, voice assistants, voice interaction, and immersive sound all rely on glasses with audio playback capabilities. However, unlike in-ear or semi-in-ear headphones, the sound-producing mechanism of glasses is usually located far from the ear canal. The farther the sound-producing mechanism is from the ear canal, the greater the attenuation of low frequencies. Therefore, the mid-to-low frequency sound quality of glasses with audio playback capabilities is often unsatisfactory. This is particularly true when enjoying music, where the mid-to-low frequency sound quality is often disappointing.

[0003] To improve the mid-to-low frequency sound of glasses with audio playback capabilities, one could consider increasing the displacement of the diaphragm in the sound-generating device. However, increasing the displacement of the diaphragm means increasing the size of the magnetic circuit components (such as the size along the direction of diaphragm vibration), which would result in an excessively low resonant frequency in the cavity of the sound-generating device, leading to significant sound leakage.

[0004] Therefore, how to ensure the mid-to-low frequency sound quality of glasses while reducing sound leakage is a technical problem that urgently needs to be solved in this field. Summary of the Invention

[0005] This specification provides an embodiment of eyeglasses, including: a sound-generating device comprising a diaphragm and a magnetic circuit assembly, wherein a front cavity is formed on the side of the diaphragm facing away from the magnetic circuit assembly, and a back cavity is formed on the side of the diaphragm facing the magnetic circuit assembly; temples housing the sound-generating device, the temples having a sound outlet and a pressure relief hole; the sound outlet communicating with the back cavity, and the pressure relief hole communicating with the front cavity; in the wearing state, the sound outlet being closer to the user's ear canal than the pressure relief hole, and the opening area of ​​the sound outlet being larger than the opening area of ​​the pressure relief hole; and a frame connected to the temples.

[0006] In some embodiments, the sound outlet is positioned toward the ear canal opening.

[0007] In some embodiments, the pressure relief hole is located on the upper side of the temple.

[0008] In some embodiments, the centroid of the outer end face of the pressure relief hole to the centroid of the outer end face of the sound outlet hole forms a first vector, and the centroid of the outer end face of the sound outlet hole to the centroid of the ear canal opening forms a second vector, and the angle formed by the straight line containing the first vector and the straight line containing the second vector is in the range of 0-60°.

[0009] In some embodiments, the first resonant frequency range of the structure formed by the sound outlet and the back cavity is 2kHz-4kHz.

[0010] In some embodiments, the temple is provided with a tuning hole that communicates with the back cavity, and the distance between the centroid of the outer end face of the tuning hole and the centroid of the outer end face of the pressure relief hole is less than the distance between the centroid of the outer end face of the tuning hole and the centroid of the outer end face of the sound outlet hole.

[0011] In some embodiments, the second resonant frequency of the structure formed by the tuning hole, the sound outlet, and the back cavity is not less than 3kHz.

[0012] In some embodiments, the difference between the third resonant frequency and the second resonant frequency of the structure formed by the pressure relief hole and the front cavity is no greater than 2kHz.

[0013] In some embodiments, both the tuning hole and the pressure relief hole are located on the upper side of the temple, with the tuning hole being closer to the connection between the temple and the frame than the pressure relief hole.

[0014] In some embodiments, the opening area of ​​the tuning hole is smaller than the opening area of ​​the pressure relief hole.

[0015] In some embodiments, the ratio of the opening area of ​​the tuning hole to the opening area of ​​the pressure relief hole is less than or equal to 10%.

[0016] In some embodiments, the magnetic circuit assembly includes a magnet and a magnetic conductor at least partially surrounding the magnet, with a magnetic gap formed between the magnet and the magnetic conductor; the sound-generating device further includes a voice coil connected to the diaphragm, the voice coil at least partially extending into the magnetic gap; and a through hole is formed on the voice coil or the magnetic conductor.

[0017] In some embodiments, a sound-absorbing material is provided on the inner sidewall of the back cavity opposite to the sound outlet.

[0018] In some embodiments, the temple is provided with a first sound-absorbing structure that is acoustically connected to the back cavity. The first sound-absorbing structure includes a first sound-absorbing cavity and a first sound guide tube. The first sound-absorbing cavity is connected to the back cavity through the first sound guide tube. The first sound-absorbing structure has a first resonant frequency. The structure formed by the sound outlet and the back cavity has a first resonant frequency. The absolute value of the difference between the first resonant frequency and the first resonant frequency is less than 1 kHz.

[0019] In some embodiments, the temple is provided with a second sound-absorbing structure acoustically connected to the front cavity. The second sound-absorbing structure includes a second sound-absorbing cavity and a second sound guide tube. The second sound-absorbing cavity is connected to the front cavity through the second sound guide tube. The second sound-absorbing structure has a second resonant frequency and a corresponding quality factor. The structure formed by the sound outlet and the back cavity has a first resonant frequency. The quality factor causes the sound absorption response curve of the second sound-absorbing structure to have a first resonant peak and a second resonant peak. The first frequency corresponding to the first resonant peak is less than the second frequency corresponding to the second resonant peak, and the second resonant frequency is located between the first frequency and the second frequency. The absolute value of the difference between the first resonant frequency and the frequency corresponding to the first resonant peak is less than 1 kHz.

[0020] In some embodiments, the axis of the sound outlet is inclined relative to the sidewall where the sound outlet is located.

[0021] In some embodiments, the opening length of the sound outlet is greater than or equal to the opening length of the pressure relief hole.

[0022] In some embodiments, the opening width of the sound outlet is greater than or equal to the opening width of the pressure relief hole.

[0023] In some embodiments, the temple includes a wearing section and a connecting section along its length, the connecting section connecting the wearing section and the frame, the lower sidewall of the connecting section and the lower sidewall of the wearing section being connected by an arc-shaped plate, and at least a portion of the sound outlet is located on the arc-shaped plate. Attached Figure Description

[0024] This specification will be further described by way of exemplary embodiments, which will be described in detail with reference to the accompanying drawings. These embodiments are not limiting; in these embodiments, the same reference numerals denote the same structures, wherein:

[0025] Figure 1 is a schematic diagram of the structure of eyeglasses according to some embodiments of this specification;

[0026] Figure 2A is a schematic diagram of the temple and sound-generating device according to some embodiments of this specification;

[0027] Figure 2B is a structural schematic diagram of the temple and sound-generating device according to some other embodiments of this specification;

[0028] Figure 3A is a frequency response curve of the structure formed by the sound outlet and the corresponding cavity in the embodiment according to Figures 2A and 2B of this specification;

[0029] Figure 3B is a frequency response curve of the structure formed by the pressure relief hole and the corresponding cavity in the embodiments of Figures 2A and 2B according to this specification;

[0030] Figure 3C is a far-field sound leakage curve of the glasses corresponding to the structure in the embodiments of Figures 2A and 2B in this specification;

[0031] Figure 4A is a cross-sectional view of the temple and sound-generating device according to some embodiments of this specification;

[0032] Figure 4B is another cross-sectional view of the temple and sound-generating device according to some embodiments of this specification;

[0033] Figure 5 is a schematic diagram of the temple and sound-generating device from another angle according to some embodiments of this specification;

[0034] Figure 6 is a structural schematic diagram of a sound-generating device according to some embodiments of this specification;

[0035] Figure 7A is a structural schematic diagram of the temple and sound-generating device according to some other embodiments of this specification;

[0036] Figure 7B is a schematic diagram of the temple and sound-generating device from another angle according to some other embodiments of this specification;

[0037] Figure 8A shows the frequency response curves of the structure formed by the sound outlet and the back cavity according to this instruction manual, with and without the tuning hole.

[0038] Figure 8B shows the frequency response curves of the structure formed by the pressure relief hole and the front cavity according to this specification, with and without the tuning hole.

[0039] Figure 9 is a far-field sound leakage curve of the glasses according to the embodiments of this specification, with and without the tuning hole;

[0040] Figure 10 is a structural schematic diagram of the sound-generating device and sound-absorbing material according to some embodiments of this specification;

[0041] Figure 11 is a structural schematic diagram of the sound-generating device and the second sound-absorbing structure according to some embodiments of this specification;

[0042] Figure 12 is a frequency response curve of the structure formed by the pressure relief hole and the front cavity according to this specification, with or without the second sound-absorbing structure.

[0043] Figure 13 is a far-field sound leakage curve of the glasses according to the embodiments of this specification with and without the second sound-absorbing structure.

[0044] Explanation of reference numerals in the attached drawings: 1. Eyeglasses; 10. Sound-generating device; 20. Temple; 30. Frame; 110. Diaphragm; 120. Magnetic circuit assembly; 121. Magnet; 122. Magnetic conductor; 130. Voice coil; 140. Front cavity; 150. Back cavity; 160. Through hole; 170. Sound-absorbing material; 180. Second sound-absorbing structure; 181. Second sound-absorbing cavity; 182. Second sound guide tube; 210. Sound outlet; 220. Pressure relief hole; 230. Tuning hole; 240. Connecting section; 250. Wearing section; 260. Curved plate. Detailed Implementation

[0045] To more clearly illustrate the technical solutions of the embodiments in this specification, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are merely some examples or embodiments of this specification. For those skilled in the art, these drawings can be applied to other similar scenarios without creative effort. Unless obvious from the context or otherwise specified, the same reference numerals in the drawings represent the same structures or operations.

[0046] It should be understood that the terms “system,” “device,” “unit,” and / or “module” used herein are one way to distinguish different components, elements, parts, sections, or assemblies at different levels. However, if other terms can achieve the same purpose, they may be replaced by other expressions.

[0047] Unless the context clearly indicates an exception, words such as "a," "an," "a kind," and / or "the" do not specifically refer to the singular and may also include the plural. Generally speaking, the terms "comprising" and "including" only indicate the inclusion of explicitly identified steps and elements, which do not constitute an exclusive list, and the method or apparatus may also include other steps or elements.

[0048] Figure 1 is a structural schematic diagram of eyeglasses according to some embodiments of this specification, and Figure 2A is a structural schematic diagram of temples and sound-generating device 10 according to some embodiments of this specification. As shown in Figures 1 and 2A, embodiments of this specification provide eyeglasses 1 with audio playback function. The eyeglasses 1 includes a sound-generating device 10, temples 20, and a frame 30. The sound-generating device 10 includes a diaphragm 110 and a magnetic circuit assembly 120. A front cavity 140 is formed on the side of the diaphragm 110 facing away from the magnetic circuit assembly 120, and a back cavity 150 is formed on the side of the diaphragm 110 facing the magnetic circuit assembly 120. The temples 20 accommodate the sound-generating device 10, and the temples 20 are provided with a sound outlet 210 and a pressure relief hole 220; the sound outlet 210 communicates with the back cavity 150, and the pressure relief hole 220 communicates with the front cavity 140; in the wearing state, the sound outlet 210 is closer to the user's ear canal opening 2 than the pressure relief hole 220 (see Figures 1 and 5). The frame 30 is attached to the temple 20. It should be noted that the arrows in Figures 1 and 2A indicating front, back, top, bottom, inside, and outside refer to either the eyeglasses 1 or the temple 20. In the example of this specification, the orientation of the sound-generating device 10 is such that the front and back (back) directions of the diaphragm 110 correspond to the inside and outside directions of the temple 20 of the eyeglasses 1. However, in other embodiments, the orientation of the sound-generating device 10 can be changed; for example, the front and back (back) directions of the diaphragm 110 can be changed to correspond to the up and down directions of the temple 20 of the eyeglasses 1.

[0049] The sound-generating device 10 is an audio playback device. The sound-generating device can be a speaker, loudspeaker, etc. The magnetic circuit assembly 120 can generate a magnetic field that drives the diaphragm 110 to vibrate. The diaphragm 110 vibrates under the drive of the magnetic field of the magnetic circuit assembly 120, thereby generating sound waves on the front and rear sides of the diaphragm 110 (e.g., corresponding to the outward and inward directions of the temple 20). For example, the magnetic circuit assembly 120 may also include a voice coil, which is a coil for the passage of current. The voice coil can be located on the side of the diaphragm 110 facing the magnetic circuit assembly 120 and fixed to the diaphragm 110, situated within the magnetic field formed by the magnetic circuit assembly 120 (such as the magnetic gap formed by the magnetic circuit assembly 120). When an electrical signal (i.e., an audio signal) passes through the voice coil, it vibrates under the influence of the magnetic field, driving the diaphragm 110 to vibrate, thereby causing the diaphragm 110 to generate sound waves and radiate sound outwards. For further structural description of the sound-generating device 10, please refer to Figure 6 and its related description.

[0050] The temple 20 may include a housing and a receiving cavity enclosed by the housing, within which the sound-generating device 10 is housed. In some embodiments, the size of the sound-generating device 10 along the vibration direction of the diaphragm 110 is small, so when the acoustic device is mounted on the temple 20, the vibration direction of the diaphragm 110 can be substantially parallel to the inward and outward directions of the temple 20, thereby reducing the size of the temple 20 along the inward and outward directions to avoid the temple 20 being too large. In some embodiments, the diaphragm 110 of the sound-generating device 10 may be arranged toward the outer side of the eyeglasses 1 (i.e., toward the outer sidewall of the housing of the temple 20), and the magnetic circuit assembly 120 of the sound-generating device 10 may be arranged toward the inner side of the eyeglasses 1 (i.e., toward the inner sidewall of the housing of the temple 20). The diaphragm 110 may divide the receiving cavity, which is at least divided by the diaphragm 110 into a front cavity 140 located on the front side of the diaphragm 110 along the vibration direction of the diaphragm 110 and a back cavity 150 located on the rear side of the diaphragm 110.

[0051] Both the sound outlet 210 and the pressure relief hole 220 are located on the housing of the temple 20 and communicate with the receiving cavity. The sound outlet 210 communicates with the back cavity 150, achieving acoustic coupling. The vibration of the diaphragm 110 causes the air in the back cavity 150 to vibrate, generating air-conducted sound. The air-conducted sound generated in the back cavity 150 is transmitted to the outside through the sound outlet 210. The pressure relief hole 220 communicates with the front cavity 140, achieving acoustic coupling. The vibration of the diaphragm 110 also causes the air in the front cavity 140 to vibrate, generating air-conducted sound. The air-conducted sound generated in the front cavity 140 can be transmitted to the outside through the pressure relief hole 220.

[0052] By positioning the sound outlet 210 closer to the ear canal opening 2 than the pressure relief hole 220, the user primarily hears the sound output from the sound outlet 210. In other words, when the user wears glasses 1, the sound pressure level from the sound outlet 210 heard at the ear canal opening 2 is greater than the sound pressure level from the pressure relief hole 220. Specifically, "the sound outlet 210 is closer to the ear canal opening 2 than the pressure relief hole 220" means that the distance between the centroid of the outer end face of the sound outlet 210 and the centroid of the ear canal opening 2 is less than the distance between the centroid of the outer end face of the pressure relief hole 220 and the centroid of the ear canal opening 2. The outer end face of the sound outlet 210 can be understood as the end face of the sound outlet 210 located on the outer wall surface of the temple 20 housing, and the centroid of the outer end face of the sound outlet 210 can be understood as the geometric center of the outer end face of the sound outlet 210. The outer end face of the pressure relief hole 220 can be understood as the end face of the pressure relief hole 220 located on the outer wall surface of the temple 20 housing. The centroid of the outer end face of the pressure relief hole 220 can be understood as the geometric center of the outer end face of the pressure relief hole 220. The ear canal opening 2 refers to the outer port of the external auditory canal, and the centroid of the ear canal opening 2 refers to the geometric center of this outer port. The statement that the sound outlet hole 210 is closer to the ear canal opening 2 than the pressure relief hole 220 can also mean that the shortest distance between the sound outlet hole 210 and the ear canal opening 2 is less than the shortest distance between the pressure relief hole 220 and the ear canal opening 2. Specifically, the shortest distance between the sound outlet hole 210 and the ear canal opening 2 can be understood as the length of the shortest line connecting the edge of the outer end face of the sound outlet hole 210 to the edge of the ear canal opening 2, and the shortest distance between the pressure relief hole 220 and the ear canal opening 2 can be understood as the length of the shortest line connecting the edge of the outer end face of the pressure relief hole 220 to the edge of the ear canal opening 2.

[0053] In some embodiments, to further enhance the sound pressure level at the ear canal opening 2, the opening area of ​​the sound outlet 210 is larger than the opening area of ​​the pressure relief hole 220. It should be noted that the cross-sectional area of ​​the sound outlet 210 at different positions along its axial direction may vary; therefore, the opening area of ​​the sound outlet 210 refers to the minimum cross-sectional area at each different position along its axial direction. Similarly, the opening area of ​​the pressure relief hole 220 refers to the minimum cross-sectional area at each different position along its axial direction. Because the opening area of ​​the sound outlet 210 is larger than that of the pressure relief hole 220, more sound will be output from the sound outlet 210 to the outside, thereby enhancing the sound pressure level at the ear canal opening 2. Furthermore, since the sound output from the pressure relief hole 220 cancels out the sound output from the sound outlet 210 at the ear canal opening 2, setting the opening area of ​​the pressure relief hole 220 to be smaller also helps to enhance the sound pressure level at the user's ear canal opening 2.

[0054] Referring to the structure of the sound-generating device 10 shown in FIG2A, the dimension of the magnetic circuit assembly 120 in the vibration direction of the diaphragm 110 is larger than that of the diaphragm 110 in the vibration direction. Correspondingly, the dimension of the back cavity 150 in the vibration direction of the diaphragm 110 is larger than that of the front cavity 140 in the vibration direction of the diaphragm 110. In some embodiments, in order to make the opening direction of the sound outlet 210 better face the ear canal opening 2, and the opening direction of the pressure relief hole 220 better face away from the ear canal opening 2, the sound outlet 210 and the pressure relief hole 220 can be respectively opened on the side wall not directly opposite the diaphragm 110 or the magnetic circuit assembly 120. At this time, it is more advantageous to open a larger through hole as a sound outlet on the side wall corresponding to the back cavity 150 (the side wall not directly opposite the magnetic circuit assembly 120). That is, by making the sound outlet 210 with a larger opening area connected to the back cavity 150, while ensuring a large sound pressure level at the ear canal opening 2, the increase in the volume of the temple 20 is avoided as much as possible.

[0055] Referring to Figure 1, there are two temples 20. In some embodiments, there is one sound-generating device 10, with one temple 20 housing the sound-generating device 10. In other embodiments, there are multiple sound-generating devices 10, such as two, three, four, etc. Multiple sound-generating devices 10 are each housed by two temples 20. In some embodiments, the temple 20 includes a connecting section 240 and a wearing section 250 along the front-to-back direction, with the connecting section 240 connecting the wearing section 250 and the frame 30. The wearing section 250 is designed to fit against the user's ear so that the glasses 1 can be worn stably, and the connecting section 240 connects the wearing section 250 and the frame 30. A sound outlet 210 is provided on either the connecting section 240 or the wearing section 250. Alternatively, a portion of the sound outlet 210 is provided on the connecting section 240, and another portion is provided on the wearing section 250. A pressure relief hole 220 is provided on either the connecting section 240 or the wearing section 250. Alternatively, part of the pressure relief hole 220 may be located in the connecting section 240, and the other part may be located in the wearing section 250. For more detailed structural descriptions of the shape and structure of the temple 20, please see below.

[0056] In some embodiments, the sound outlet 210 and the pressure relief hole 220 may be located on the same sidewall of the housing of the temple 20. For example, the sound outlet 210 and the pressure relief hole 220 may both be located on one of the upper sidewall, lower sidewall, inner sidewall, or outer sidewall of the housing. In other embodiments, the sound outlet 210 and the pressure relief hole 220 may be located on different sidewalls of the housing of the temple 20. For example, the sound outlet 210 may be located on the upper sidewall of the housing, and the pressure relief hole 220 may be located on the lower sidewall of the temple 20; or, the sound outlet 210 may be located on the lower sidewall of the housing, and the pressure relief hole 220 may be located on the upper sidewall of the temple 20. It should be noted that the upper sidewall of the housing is the sidewall facing the top of the head when the glasses 1 is worn; the lower sidewall of the temple 20 is the sidewall facing the feet when the glasses 1 is worn; the inner sidewall of the temple 20 is the sidewall facing the face when the glasses 1 is worn; and the outer sidewall of the temple 20 is the sidewall facing away from the face when the glasses 1 is worn. Further explanation regarding the placement of the sound outlet 210 and the pressure relief hole 220 on the temple 20 can be found below.

[0057] The frame 30 and temples 20 combine to form the frame of the eyeglasses 1. The frame 30 is a component used to support and mount the optical components of the eyeglasses 1. For example, when the eyeglasses 1 are myopia glasses 1, sunglasses, hyperopia glasses 1, etc., the frame 30 can support and mount the lenses of the eyeglasses 1. As another example, when the eyeglasses 1 are AR / VR glasses 1, the frame 30 can support and mount the display of the eyeglasses 1. In some embodiments, the temples 20 are connected to the frame 30 via hinges, allowing the temples 20 to fold when not being worn.

[0058] By setting the sound outlet 210 and the pressure relief hole 220, sound leakage of the glasses 1 can be reduced. The specific principle is as follows: the sound wave on the front side of the diaphragm 110 is led out through the pressure relief hole 220, and the sound wave on the rear side of the diaphragm 110 is led out through the sound outlet 210. Since the sound waves on the front and rear sides of the diaphragm 110 are 180° out of phase, an acoustic dipole with a certain directionality can be formed. An acoustic dipole is a sound source composed of two monopole sources that are very close together (the distance between them is much smaller than the wavelength), with basically equal intensity and opposite phase (180° out of phase). Its sound field is roughly in the shape of an "8", and the sound pressure level of the sound field is the largest in the direction of the line connecting the two monopole sources, thus making the sound directional and reducing sound leakage. However, when sound waves from the front and rear sides of the diaphragm 110 radiate to the outside after passing through the front cavity 140 and the back cavity 150, if there is cavity resonance in the front cavity 140 and the back cavity 150, the phase of the sound waves will change abruptly, the effect of the acoustic dipole will be destroyed, and the sound will no longer be directional, resulting in increased sound leakage. For the sound-generating device 10, increasing the size of the magnetic circuit assembly 120 can improve the mid-low frequency sound effect of the glasses 1, but the magnetic circuit assembly 120 will reduce the resonant frequency of the back cavity 150, and the larger the size of the magnetic circuit assembly 120 (such as the size along the vibration direction of the diaphragm), the lower the resonant frequency of the back cavity 150 will be. Due to the presence of the magnetic circuit assembly 120, the resonant frequency of the back cavity 150 will be lower than the resonant frequency of the front cavity 140. When the frequency of the sound is between the resonant frequency of the back cavity 150 and the resonant frequency of the front cavity 140, the acoustic dipole cannot reduce sound leakage. Therefore, while increasing the size of the magnetic circuit assembly of the sound-generating device, in order to make the glasses 1 have a better sound leakage reduction effect, it is desirable that the resonant frequency of the back cavity 150 is as high as possible, and the difference between the resonant frequency of the front cavity 140 and the resonant frequency of the back cavity 150 is as small as possible.

[0059] Figure 2B is a schematic diagram of the temple 20 and the sound-generating device 10 according to some other embodiments of this specification. The difference between the embodiment shown in Figure 2B and the embodiment shown in Figure 2A is that, in the embodiment shown in Figure 2B, the sound outlet 210 on the temple 20 is connected to the front cavity 140, and the pressure relief hole 220 on the temple 20 is connected to the back cavity 150. Since the back cavity 150 is larger in the vibration direction than the front cavity 140, it is difficult to open a large sound outlet 210 on the side wall corresponding to the front cavity 140 as shown in Figure 2B, resulting in a lower sound pressure level (especially low-frequency sounds) at the ear canal opening 2. In addition, if it is desired to increase the opening area of ​​the sound outlet 210, it may be necessary to adjust the structure of the temple 20 to increase the volume of the front cavity 140, which would lead to an increase in the volume of the temple 20.

[0060] Comparing the embodiments shown in Figure 2A and Figure 2B of this specification, it can be seen that in the embodiment shown in Figure 2A, by making the sound outlet 210 connected to the back cavity 150, it is beneficial to set a larger opening area for the sound outlet 210, ensuring the sound pressure level at the ear canal opening 2. Furthermore, by allowing the sound waves generated by the diaphragm 110 to pass through the back cavity 150 and be output from the larger opening area of ​​the sound outlet 210, it is beneficial to increase the resonant frequency of the back cavity 150 (compared to the embodiment in Figure 2B), thereby offsetting the negative impact of the magnetic circuit assembly 120 on the resonant frequency of the back cavity 150. Furthermore, since the pressure relief hole 220 with a smaller opening area is connected to the front cavity 140, the sound waves generated by the diaphragm 110 are output from the pressure relief hole 220 with a smaller opening area after passing through the front cavity 140. This can reduce the resonant frequency of the front cavity 140 (compared to the embodiment in Figure 2B) and also reduce the resonant frequency of the front cavity 140, thereby reducing the difference between the resonant frequency of the front cavity 140 and the resonant frequency of the back cavity 150.

[0061] The following comparison of the frequency response curves of the relevant structures in the embodiments shown in Figure 2A and Figure 2B further illustrates the technical effects of the embodiment shown in Figure 2A. Figure 3A is a frequency response curve of the structure formed by the sound outlet 210 and the corresponding cavity in the embodiments of Figures 2A and 2B according to this specification, and Figure 3B is a frequency response curve of the structure formed by the pressure relief hole 220 and the corresponding cavity in the embodiments of Figures 2A and 2B according to this specification. In Figures 3A and 3B, the horizontal axis represents frequency (Freq, in kHz), and the vertical axis represents output sound pressure level (SPL, in dB). Comparing Figures 3A and 3B, the resonant frequencies of the structures formed by the sound outlet 210 and the corresponding cavity (the cavity connected to the sound outlet 210) in the embodiments of Figures 2A and 2B, as well as the resonant frequencies of the structures formed by the pressure relief hole 220 and the corresponding cavity (the cavity connected to the pressure relief hole 220), can be seen. It should be noted that, in this specification, the resonant frequency of the structure formed by the cavity (such as the front cavity 140 and the back cavity 150) and its corresponding components (such as the sound outlet 210, the pressure relief hole 220, and the tuning hole described below) can be understood as the resonant frequency of the cavity under the influence of the corresponding components. In certain locations within this specification, the resonant frequency of the structure formed by the cavity (such as the front cavity 140 and the back cavity 150) and its corresponding components (such as the sound outlet 210, the pressure relief hole 220, and the tuning hole described below) will be simplified and expressed as the resonant frequency of the cavity (such as the front cavity 140 and the back cavity 150).

[0062] The frequency response curves of the structure formed by the sound outlet 210 and the front cavity 140, and the frequency response curves of the structure formed by the pressure relief hole 220 and the back cavity 150 in the embodiment shown in Figure 2B are illustrated by the dashed lines in Figures 3A and 3B. As can be seen from the dashed lines in Figures 3A and 3B, the resonant frequency of the structure formed by the sound outlet 210 and the front cavity 140 is approximately 4.8 kHz; the resonant frequency of the structure formed by the pressure relief hole 220 and the back cavity 150 is approximately 2.5 kHz. At this point, the resonant frequencies of the structures formed by the sound outlet 210 and the front cavity 140 and the pressure relief hole 220 and the back cavity 150 differ significantly (approximately 2.3 kHz). This means that the glasses 1 cannot reduce sound leakage for sounds in the frequency range of 2.5 kHz to 4.8 kHz.

[0063] The frequency response curves of the structure formed by the sound outlet 210 and the back cavity 150, and the frequency response curves of the structure formed by the pressure relief hole 220 and the front cavity 140, as shown by the solid lines in Figures 3A and 3B in the embodiment shown in Figure 2A, are as follows. As can be seen from the solid lines in Figures 3A and 3B, the resonant frequency of the structure formed by the sound outlet 210 and the back cavity 150 is approximately 3kHz; the resonant frequency of the structure formed by the pressure relief hole 220 and the front cavity 140 is approximately 4.2kHz. At this point, the difference in resonant frequencies between the structures formed by the sound outlet 210 and the back cavity 150 and the structures formed by the pressure relief hole 220 and the front cavity 140 is reduced (reduced to approximately 1.2kHz). This means that the glasses 1 cannot reduce sound leakage for sounds with frequencies in the range of 3kHz-4.2kHz. Therefore, by connecting the sound outlet 210 to the back cavity 150 and the pressure relief hole 220 to the front cavity 140, the frequency range in which sound leakage reduction can be achieved can be increased, thereby improving the sound leakage reduction effect of the glasses 1.

[0064] Figure 3C is a far-field sound leakage curve of the glasses 1 corresponding to the structures in the embodiments of Figures 2A and 2B in this specification. To further verify the sound leakage reduction effect, the far-field sound leakage of the embodiments of Figure 2A and Figure 2B was compared and tested, as shown in Figure 3C. In Figure 3C, the horizontal axis represents frequency (Freq, in kHz), and the vertical axis represents the output sound pressure level (SPL, in dB). Obviously, in the embodiment of Figure 2B (corresponding to the dashed line in Figure 3C), the maximum sound leakage peak is formed at the frequency of 2.5kHz, which corresponds to the resonant frequency of the structure formed by the pressure relief hole 220 and the back cavity 150. In the frequency range of 1kHz to 3kHz, the sound pressure level of the far-field sound leakage of the embodiment of Figure 2A (corresponding to the solid line in Figure 3C) is generally lower than that of the embodiment of Figure 2B. It can be seen that the sound leakage reduction effect of the embodiment of Figure 2A is better.

[0065] In some embodiments, the first resonant frequency of the structure formed by the sound outlet 210 and the back cavity 150 is greater than or equal to 2 kHz. In some embodiments, the first resonant frequency of the structure formed by the sound outlet 210 and the back cavity 150 is greater than 2.8 kHz. In some embodiments, the first resonant frequency range of the structure formed by the sound outlet 210 and the back cavity 150 is 2 kHz to 4 kHz. For example, the first resonant frequency can be 2 kHz, 2.5 kHz, 3 kHz, 3.3 kHz, 4 kHz, etc. By setting the first resonant frequency within the above range (e.g., less than or equal to 4 kHz), the first resonant frequency is prevented from being too large and exceeding the resonant frequency of the structure formed by the pressure relief hole 220 and the front cavity 140, thereby ensuring that the sound leakage reduction effect of the glasses can be improved (if the first resonant frequency is greater than the resonant frequency of the structure formed by the pressure relief hole 220 and the front cavity 140, increasing the first resonant frequency will reduce the sound leakage reduction effect of the glasses). Furthermore, as mentioned above, to ensure the sound leakage reduction effect of glasses 1, the resonant frequency of the back cavity 150 will affect the frequency band in which the acoustic dipole cannot achieve the sound leakage reduction effect (this frequency band is higher than the resonant frequency of the back cavity 150). The higher the resonant frequency of the back cavity 150, the wider the frequency band in which the sound leakage reduction effect can be achieved before the resonant frequency of the back cavity 150. By setting the first resonant frequency within the above range (e.g., greater than or equal to 2kHz), it is possible to avoid the first resonant frequency being too small, thereby avoiding the resulting excessively large frequency band in which the acoustic dipole cannot achieve the sound leakage reduction effect, and also to avoid an excessively large difference between the first resonant frequency and the resonant frequency of the front cavity 140.

[0066] In some embodiments, the resonant frequency (corresponding to the third resonant frequency below) of the structure formed by the pressure relief hole 220 and the front cavity 140 is less than or equal to 5 kHz. In some embodiments, the resonant frequency (corresponding to the third resonant frequency below) of the structure formed by the pressure relief hole 220 and the front cavity 140 is greater than 4 kHz and less than or equal to 5 kHz. For example, the resonant frequency of the structure formed by the pressure relief hole 220 and the front cavity 140 can be 4.2 kHz, 4.5 kHz, 4.8 kHz, 5 kHz, etc. By setting the resonant frequency of the structure formed by the pressure relief hole 220 and the front cavity 140 within the above range (e.g., greater than 4 kHz), the resonant frequency of the structure formed by the pressure relief hole 220 and the front cavity 140 is greater than the first resonant frequency, ensuring that the effect of improving the sound leakage reduction of the glasses can be achieved. Furthermore, as mentioned above, in order to ensure the sound leakage reduction effect of glasses 1, the resonant frequency of the front cavity 140 will affect the frequency band in which the acoustic dipole cannot achieve the sound leakage reduction effect (this frequency band is lower than the resonant frequency of the front cavity 140). By setting the resonant frequency of the structure formed by the pressure relief hole 220 and the front cavity 140 within the above range (e.g., less than or equal to 5kHz), the difference between the resonant frequency of the structure formed by the pressure relief hole 220 and the front cavity 140 and the first resonant frequency can be minimized as much as possible. This avoids the frequency band in which the acoustic dipole cannot achieve the sound leakage reduction effect being too large due to the resonant frequency of the structure formed by the pressure relief hole 220 and the front cavity 140 being too large.

[0067] For users with different head sizes, the distance between the sound outlet 210 and the ear may vary significantly in the front-to-back direction when wearing glasses 1. In some embodiments, to ensure that the distance between the sound outlet 210 and the ear canal opening 2 is not too far when users with different head sizes wear glasses 1, the sound outlet 210 can be extended along the front-to-back direction of the temple 20.

[0068] Figure 4A is a cross-sectional view of the temple 20 and the sound-generating device 10 according to some embodiments of this specification. In some embodiments, as shown in Figure 4A, the opening length L1 of the sound outlet 210 is greater than or equal to the opening length L2 of the pressure relief hole 220. This arrangement can help increase the opening area of ​​the sound outlet 210, making the opening area of ​​the sound outlet 210 larger than that of the pressure relief hole 220. It should be noted that the opening length L1 of the sound outlet 210 / the opening length L2 of the pressure relief hole 220 can be understood as the length dimension of the sound outlet 210 / the pressure relief hole 220 in a cross-section perpendicular to the inward and outward directions (as shown in Figure 4A).

[0069] In some embodiments, the length of the sound outlet 210 in the front-rear direction of the temple 20 can be directly increased so that the opening length L1 of the sound outlet 210 is greater than or equal to the opening length L2 of the pressure relief hole 220. In other embodiments, the opening length L1 of the sound outlet 210 can be increased by the structural design of the temple 20 at the location of the sound outlet 210. In some specific embodiments, as shown in Figures 1 and 4A, the temple 20 includes a wearing section 250 and a connecting section 240 along its length, the connecting section 240 connecting the wearing section 250 and the frame 30; the lower sidewalls of the connecting section 240 and the wearing section 250 are connected by an arc-shaped plate 260, and at least a portion of the sound outlet 210 is located on the arc-shaped plate 260. By placing at least a portion of the sound outlet 210 on the arc-shaped plate 260, the opening length L1 of the sound outlet 210 can be maximized within a limited space, thereby increasing the area of ​​the sound outlet 210. In addition, the curved plate 260 can also fit with the user's ears and head (such as clipping between the ears and head) so that the user can wear the glasses 1 stably and comfortably.

[0070] In some embodiments, as shown in FIG4B, the opening width W1 of the sound outlet 210 is greater than or equal to the opening width W2 of the pressure relief hole 220. It should be noted that the opening width of the sound outlet 210 / the opening width of the pressure relief hole 220 can be understood as the width dimension of the sound outlet 210 / the pressure relief hole 220 in a cross section perpendicular to the front-rear direction. Based on the above description, since the dimension of the back cavity 150 in the diaphragm vibration direction is larger than that of the front cavity 140 in the diaphragm vibration direction, the setting space for the sound outlet 210 is larger than that for the pressure relief hole 220. Therefore, setting the opening width W1 of the sound outlet 210 to be greater than or equal to the opening width W2 of the pressure relief hole 220 can increase the opening area of ​​the sound outlet 210 without increasing the volume of the temple 20.

[0071] In some embodiments, when the orientation of the sound-generating device 10 is such that the vibration direction of the diaphragm 110 is substantially parallel to the inward and outward directions of the temple 20 (for example, the diaphragm 110 is positioned towards the outer wall of the temple 20 housing, and the magnetic circuit assembly 120 is positioned towards the inner wall of the temple 20 housing), due to the size limitations of the temple 20, it is difficult to open the pressure relief hole 220 and the sound outlet hole 210 on the inner and outer walls of the housing. In this case, the sound outlet hole 210 is located on the upper or lower side wall of the temple 20. In some embodiments, to ensure the user's listening effect, both the sound outlet hole 210 and the pressure relief hole 220 are located in front of the ear when worn. In some embodiments, when a user wears glasses 1, since the temple 20 is placed above the ear, in order to improve the user's hearing, the sound outlet 210 is located on the lower side wall of the temple 20, and the pressure relief hole 220 is located on the upper side wall of the temple 20.

[0072] In some embodiments, the sound outlet 210 is oriented towards the ear when worn. In some embodiments, the sound outlet 210 is oriented towards the ear canal opening 2. That is, in the wearing state, the sound outlet 210 faces the user's ear canal opening 2. At this time, the sound outlet 210 is located on the lower surface of the temple 20. By setting the sound outlet 210 to face the ear canal opening 2, the user's hearing effect can be improved when wearing the glasses 1.

[0073] In some embodiments, the pressure relief hole 220 is located on the upper side of the temple 20. Since the sound outlet 210 faces the ear canal opening 2 and is located on the lower side of the temple 20, placing the pressure relief hole 220 on the upper side of the temple 20 allows the sound radiation of the acoustic dipole to be oriented substantially in the vertical direction along the temple 20 (for example, the angle between the line connecting the two monopole sources and the vertical direction is less than 60°). Since the ear canal opening 2 is located below the temple 20 when the user wears the glasses 1, this can help improve the user's hearing effect.

[0074] In some embodiments, the pressure relief hole 220 is closer to the connection between the temple 20 and the frame 30 than the sound outlet hole 210. When worn, both the pressure relief hole 220 and the sound outlet hole 210 are located in front of the ear, while the temple 20 is located above the ear. This arrangement allows the line connecting the two monopole sources of the acoustic dipole to point behind the temple 20 on the underside of the temple 20, i.e., towards the ear, thereby improving the user's hearing experience when wearing the glasses 1. In this specification, the connection between the temple 20 and the frame 30 can refer to the location of the hinge used for connection between the temple 20 and the frame 30.

[0075] In some embodiments, the centroid of the outer end face of the pressure relief hole 220 to the centroid of the outer end face of the sound outlet hole 210 forms a first vector Q1, and the centroid of the outer end face of the sound outlet hole 210 to the centroid of the ear canal opening 2 forms a second vector Q2. The angle α formed by the straight line containing the first vector Q1 and the straight line containing the second vector Q2 ranges from 0° to 60°. As shown in Figure 5, the first vector Q1, which is the centroid of the outer end face of the pressure relief hole 220 to the centroid of the outer end face of the sound outlet hole 210, corresponds to the line connecting the two monopole sources of the acoustic dipole. Therefore, the angle α formed by the straight line containing the first vector Q1 and the straight line containing the second vector Q2 can reflect the relative positional relationship between the ear canal opening 2 and the sound field. Since the sound pressure level of the sound field is strongest in the direction of the line connecting the two monopole sources, by setting the angle α formed by the straight line containing the first vector Q1 and the straight line containing the second vector Q2 to a range of 0° to 60°, the user's ear canal opening 2 can receive a sound with a higher sound pressure level, ensuring the user's listening effect when wearing glasses 1. In some embodiments, the angle α formed by the line containing the first vector Q1 and the line containing the second vector Q2 is in the range of 0°-45°, which can improve the user's hearing effect when wearing glasses 1.

[0076] In some embodiments, as shown in FIG2A, the axis of the sound outlet 210 is inclined relative to the sidewall where the sound outlet 210 is located. The axis of the sound outlet 210 can be seen as the dashed line at the sound outlet 210 in FIG2A. As an example, in the embodiment shown in FIG2A, the sound outlet 210 is disposed on the lower sidewall of the temple 20, and the sidewall where the sound outlet 210 is located is the lower sidewall of the temple 20 housing. The inclination of the axis of the sound outlet 210 relative to the sidewall where the sound outlet 210 is located can be understood as the axis of the sound outlet 210 not being perpendicular to the sidewall where the sound outlet 210 is located. In some embodiments, the direction of inclination of the axis of the sound outlet 210 relative to the sidewall where the sound outlet 210 is located can be: the vector from the centroid of the inner end face of the sound outlet 210 to the centroid of the outer end face of the sound outlet 210 points to the outer side of the temple 20. The inner end face of the sound outlet 210 can be understood as the end face of the sound outlet 210 located on the inner wall surface of the temple 20 housing. When the back cavity 150 of the acoustic device is arranged facing the inner wall of the housing of the temple 20, the inner end face of the sound outlet 210 is also close to the inner side of the temple 20. Setting the axis of the sound outlet 210 to be inclined relative to the side wall where the sound outlet 210 is located can make the outer end face of the sound outlet 210 as close as possible to the outer side of the temple 20, thereby reducing the sound output from the sound outlet 210 that is reflected by the head.

[0077] The sound generated by the vibration of the diaphragm 110 causing the air in the back cavity 150 to vibrate will form a standing wave in the back cavity 150. Due to the generation of the standing wave, when the back cavity 150 resonates, a maximum sound pressure level point will appear near the opposite position of the sound outlet 220 in the back cavity 150. This phenomenon is called standing wave resonance. The generation of standing wave resonance will cause the resonant frequency of the back cavity 150 to decrease. When the frequency of the standing wave changes, the resonant frequency of the back cavity 150 will also change. Therefore, the resonant frequency of the back cavity 150 can be changed by changing the frequency of the standing wave. Studies have found that the frequency of the standing wave can be changed by: changing (e.g., shortening) the sound transmission path in the back cavity 150, changing the structure at the boundary where the standing wave is generated in the back cavity 150, etc. For example, by shortening the sound transmission path in the back cavity 150, the longer wavelength standing wave can be destroyed, thereby changing the frequency of the standing wave and increasing the resonant frequency of the back cavity 150. For example, by changing the hard boundary at the boundary where the standing wave is generated in the back cavity 150 to a soft boundary or an impedance boundary, the longer wavelength standing wave can be destroyed, the frequency of the standing wave can be changed, and thus the resonant frequency of the back cavity 150 can be increased. This will be further explained below with reference to Figures 6-10.

[0078] Figure 6 is a schematic structural diagram of a sound-generating device 10 according to some embodiments of this specification. In some embodiments, as shown in Figure 6, the magnetic circuit assembly 120 includes a magnet 121 and a magnetic guide 122 at least partially surrounding the magnet 121, with a magnetic gap formed between the magnet 121 and the magnetic guide 122. The sound-generating device 10 also includes a voice coil 130 connected to a diaphragm 110, the voice coil 130 at least partially extending into the magnetic gap. The magnet 121 is an element capable of generating a magnetic field. The magnet 121 can be a magnet (including but not limited to metal alloy magnets, ferrites, etc.). The magnetic guide 122 can adjust the distribution of the magnetic field (e.g., the magnetic field generated by a magnetic element). The magnetic guide 122 can include an element processed from a soft magnetic material. In some embodiments, the voice coil 130 can be annular. In some embodiments, the magnetic guide 122 can be annular. In other embodiments, the magnetic guide 122 can be cylindrical. In this case, the magnetic guide 122 can include annular sidewalls and a bottom wall.

[0079] In some embodiments, a through hole 160 is provided on the voice coil 130 or the magnetic conductor 122. The location and extension direction of the through hole 160 can be varied. In some embodiments, when the through hole 160 is provided on the voice coil 130, the through hole 160 connects the inner and outer sides of the annular voice coil 130. As an example only, the extension direction of the through hole 160 can be perpendicular to the vibration direction of the diaphragm 110. In other embodiments, the through hole 160 can be provided on the magnetic conductor 122, and the through hole 160 connects the inner and outer sides of the cylindrical magnetic conductor 122. As an example only, the through hole 160 is provided on the annular sidewall of the magnetic conductor 122, in which case the extension direction of the through hole 160 can be perpendicular to the vibration direction of the diaphragm 110. As an example only, the through hole 160 is provided on the bottom wall of the magnetic conductor 122, in which case the extension direction of the through hole 160 can be parallel to the vibration direction of the diaphragm 110. Without the through-hole 160, the sound transmission curve in the back cavity 150 is shown by the dashed line in Figure 6. After setting the through-hole 160 according to any of the above embodiments, sound can pass through the through-hole 160, and thus the sound can be transmitted to the outside of the back cavity 150 through a shorter transmission path. The through-hole 160 opened on the voice coil 130 or the magnetic conductor 122 can shorten the transmission path of part of the sound in the back cavity 150, thereby changing the frequency of the standing wave generated in the back cavity 150, so as to reduce the resonant frequency of the back cavity 150.

[0080] Figure 7A is a structural schematic diagram of the temple and sound-generating device according to some other embodiments of this specification, and Figure 7B is a structural schematic diagram of the temple and sound-generating device from another angle according to some other embodiments of this specification. In some embodiments, as shown in Figures 7A and 7B, a tuning hole 230 communicating with the back cavity 150 is provided on the temple 20. The distance between the centroid of the outer end face of the tuning hole 230 and the centroid of the outer end face of the pressure relief hole 220 is less than the distance between the centroid of the outer end face of the tuning hole 230 and the centroid of the outer end face of the sound outlet hole 210. That is, the sound outlet hole 210 is farther away from the tuning hole 230 than the pressure relief hole 220. The outer end face of the tuning hole 230 can be understood as the end face of the tuning hole 230 located on the outer wall surface of the temple 20 housing, and the centroid of the outer end face of the tuning hole 230 can be understood as the geometric center of the outer end face of the tuning hole 230. Since the user mainly hears the sound output from the sound outlet 210, setting the sound outlet 210 further away from the tuning hole 230 than the pressure relief hole 220 can prevent the sound output from the tuning hole 230 from affecting the sound output from the sound outlet 210.

[0081] In some embodiments, as shown in Figures 7A and 7B, the tuning hole 230 and the sound outlet 210 are located on different sidewalls of the temple 20. In some embodiments, the tuning hole 230 and the sound outlet 210 are located on opposite sidewalls of the temple 20. As mentioned above, when the back cavity 150 resonates, a maximum sound pressure level point will appear near the opposite position of the sound outlet within the back cavity 150. Therefore, the tuning hole 230 can be located in the back cavity 150 at a position opposite to the location of the sound outlet 210. In this case, the tuning hole 230 and the pressure relief hole 220 are located on the same side of the temple 20. For example, both the tuning hole 230 and the pressure relief hole 220 are located on the upper sidewall of the temple 20 housing, while the sound outlet 210 is located on the lower sidewall of the temple 20 housing.

[0082] By providing the tuning hole 230, a portion of the sound from the back cavity 150 can be output to the outside. This shortens the transmission curve of this sound within the back cavity 150, altering the frequency at which standing waves are generated. The tuning hole 230 further enhances the resonant frequency of the back cavity 150. The structure formed by the tuning hole 230, the sound outlet 210, and the back cavity 150 has a second resonant frequency. Without the tuning hole 230, the structure formed by the sound outlet 210 and the back cavity 150 has a first resonant frequency. Due to the tuning hole 230, the second resonant frequency is increased compared to the first resonant frequency.

[0083] The frequency response curves of each cavity with and without the tuning hole 230 are compared below using Figures 8A and 8B to further illustrate the technical effect of the tuning hole 230. Figure 8A shows the frequency response curves of the structure formed by the sound outlet and the back cavity according to this specification with and without the tuning hole 230; Figure 8B shows the frequency response curves of the structure formed by the pressure relief hole and the front cavity according to this specification with and without the tuning hole 230. In Figures 8A and 8B, the horizontal axis represents frequency (Freq, in kHz), and the vertical axis represents the output sound pressure level (SPL, in dB). In Figure 8A, the solid line represents the second resonant frequency of the structure formed by the tuning hole 230, the sound outlet 210, and the back cavity 150 after the tuning hole 230 is installed; in Figure 8B, the solid line represents the resonant frequency of the structure formed by the pressure relief hole 220 and the front cavity 140 after the tuning hole 230 is installed (corresponding to the third resonant frequency below). In Figure 8A, the dashed line represents the first resonant frequency of the structure formed by the sound outlet 210 and the back cavity 150 without the tuning hole 230. In Figure 8B, the dashed line represents the resonant frequency (corresponding to the third resonant frequency below) of the structure formed by the pressure relief hole 220 and the front cavity 140 without the tuning hole 230. As can be seen from Figure 8A, after the tuning hole 230 is installed, the second resonant frequency is approximately 3.4 kHz, which is an increase compared to the first resonant frequency (approximately 3 kHz). However, as can be seen from Figure 8B, the installation of the tuning hole 230 has almost no effect on the resonant frequency of the structure formed by the pressure relief hole 220 and the front cavity 140. However, because the second resonant frequency is higher than the first resonant frequency, the difference between the resonant frequency of the structure formed by the pressure relief hole 220 and the front cavity 140 and the second resonant frequency is small.

[0084] Figure 9 is a graph showing the far-field sound leakage curves of the glasses according to the embodiments of this specification with and without the tuning hole. In Figure 9, the horizontal axis represents frequency (Freq, in kHz), and the vertical axis represents the output sound pressure level (SPL, in dB). The dashed line in Figure 9 shows the far-field sound leakage curve of glasses 1 without the tuning hole 230, and the solid line shows the far-field sound leakage curve of glasses 1 with the tuning hole 230. As shown in Figure 9, after setting the tuning hole 230, comparing the first resonant frequency and the second resonant frequency, due to the increase in the resonant frequency, the sound pressure level of the far-field sound leakage is reduced in the frequency range below the first resonant frequency (approximately 3 kHz).

[0085] In some embodiments, the second resonant frequency of the structure formed by the tuning hole 230, the sound outlet 210, and the back cavity 150 is not less than 3kHz. For example, the second resonant frequency can be 3.2kHz, 3.4kHz, 3.5kHz, etc. As mentioned above, in order to ensure the sound leakage reduction effect of the glasses 1, the resonant frequency of the back cavity 150 will affect the frequency band in which the acoustic dipole cannot achieve the sound leakage reduction effect (this frequency band is greater than the resonant frequency of the back cavity 150). With this setting, it can be ensured that the acoustic dipole can have the sound leakage reduction effect at least below 3kHz, and the frequency range in which the acoustic dipole can achieve the sound leakage reduction effect is relatively large.

[0086] In some embodiments, the difference between the third resonant frequency and the second resonant frequency of the structure formed by the pressure relief hole 220 and the front cavity 140 is no greater than 2kHz. Based on the above discussion, when the frequency of the sound is between the second and third resonant frequencies, the acoustic dipole cannot reduce sound leakage. If the difference between the third and second resonant frequencies is too large, the frequency range in which the acoustic dipole cannot reduce sound leakage will be very large, resulting in poor sound leakage reduction of the glasses 1. By setting the tuning hole 230, the second resonant frequency is increased based on the first resonant frequency, making the difference between the third and second resonant frequencies smaller (less than 2kHz). This narrows the frequency range in which the acoustic dipole cannot reduce sound leakage, resulting in better sound leakage reduction of the glasses 1.

[0087] In some embodiments, when both the tuning hole 230 and the pressure relief hole 220 are located on the upper side of the temple 20, the tuning hole 230 is closer to the connection between the temple 20 and the frame 30 than the pressure relief hole 220. That is, the tuning hole 230 is located in front of the pressure relief hole 220. Since both the pressure relief hole 220 and the sound outlet 210 are located in front of the ear, the sound radiated towards the front of the ear by the acoustic dipole is difficult for the user to hear, leading to increased sound leakage. By placing the tuning hole 230 in the aforementioned position, some of the sound radiated towards the front of the glasses 1 by the pressure relief hole 220 can be counteracted, thereby reducing sound leakage of the glasses 1.

[0088] In some embodiments, the opening area of ​​the tuning hole 230 is smaller than that of the pressure relief hole 220. Since sound waves also propagate outward from the tuning hole 230, an excessively large area of ​​the tuning hole 230 can cause significant sound leakage. On one hand, an excessively high sound pressure level leaking from the tuning hole 230 can cancel out most of the sound from the pressure relief hole 220, resulting in the sound output from the pressure relief hole 220 failing to cancel out with the sound output from the sound outlet 210 in the far field, thus affecting the sound leakage reduction effect of the acoustic dipole. On the other hand, since the tuning hole 230 can also transmit sound from the back cavity 150 to the outside, an excessively large area of ​​the tuning hole 230 can also weaken the sound output from the sound outlet 210, affecting the user's listening volume.

[0089] In some embodiments, the ratio of the opening area of ​​the tuning hole 230 to the opening area of ​​the pressure relief hole 220 is less than or equal to 10%. For example, the ratio of the opening area of ​​the tuning hole 230 to the opening area of ​​the pressure relief hole 220 is 10%, 9%, 6%, 5%, 3%, etc. This arrangement ensures that the tuning hole 230 can effectively increase the resonant frequency of the back cavity 150 while preventing excessive sound leakage from the tuning hole 230.

[0090] Figure 10 is a schematic diagram of the structure of the sound-generating device and the sound-absorbing material according to some embodiments of this specification. In some embodiments, as shown in Figure 10, a sound-absorbing material 170 is disposed on the inner wall of the back cavity 150 opposite to the sound outlet 210. In some embodiments, the sound-absorbing material 170 may be a porous material such as sponge or foam. In some embodiments, the sound-absorbing material 170 may be disposed on the inner wall of the back cavity 150 by means of bonding, snap-fitting, etc. The boundary at the position in the back cavity 150 opposite to the sound outlet 210 that generates a standing wave is originally a hard boundary. By disposing of the sound-absorbing material 170 on the inner wall of the back cavity 150 opposite to the sound outlet 210, the sound-absorbing material 170 can absorb the sound waves reaching that position instead of directly reflecting the sound waves, changing the hard boundary into a soft boundary or an impedance boundary, thereby changing the frequency of the standing wave and thus increasing the resonant frequency of the back cavity 150.

[0091] In some embodiments, the temple 20 is provided with a first sound-absorbing structure (not shown) that is acoustically connected to the back cavity 150. The first sound-absorbing structure includes a first sound-absorbing cavity and a first sound guide tube, and the first sound-absorbing cavity is connected to the back cavity 150 through the first sound guide tube. The first sound-absorbing structure may be a Helmholtz resonant cavity. The first sound-absorbing structure has a first resonant frequency, and the structure formed by the sound outlet 210 and the back cavity 150 has a first resonant frequency; the absolute value of the difference between the first resonant frequency and the first resonant frequency is less than 1 kHz. In some embodiments, the position where the first sound guide tube is connected to the back cavity 150 may be a position in the back cavity 150 opposite to the sound outlet 210. The first sound-absorbing structure can absorb part of the sound in the back cavity 150.

[0092] The first sound-absorbing cavity can be a hollow structure, and the shape of the hollow structure can be a regular or irregular geometric shape such as a circle or rectangle. In some embodiments, the first sound-absorbing structure can generate sound by absorbing sound from the back cavity 150, causing the air in the first sound-absorbing cavity and / or the first sound guide tube to resonate. In some embodiments, since the absolute value of the difference between the first resonant frequency and the first resonant frequency is less than 1 kHz, it indicates that the first resonant frequency is close to the first resonant frequency, and the sound generated by the resonance of the first sound-absorbing structure can be out of phase with the sound absorbed in the back cavity 150. As an example only, the difference between the first resonant frequency and the first resonant frequency can be 0.3 kHz, 0.5 kHz, 0.9 kHz, etc. In some embodiments, the sound generated by the resonance of the first sound-absorbing structure can have the same or similar amplitude as the absorbed sound. Thus, the sound generated by the resonance of the first sound-absorbing structure can cancel out the sound absorbed by the first sound-absorbing structure, thereby achieving the effect of sound absorption.

[0093] The boundary at the position opposite to the sound outlet 210 in the back cavity 150 where the standing wave is generated is originally a hard boundary. The first sound-absorbing structure can absorb the sound wave reaching this position instead of directly reflecting the sound wave, thus changing the hard boundary into a soft boundary or an impedance boundary, thereby changing the frequency of the standing wave and increasing the resonant frequency of the back cavity 150.

[0094] Figure 11 is a schematic diagram of the sound-generating device and the second sound-absorbing structure according to some embodiments of this specification. In some embodiments, as shown in Figure 11, the temple 20 is provided with a second sound-absorbing structure 180 that is acoustically connected to the front cavity 140. The second sound-absorbing structure 180 includes a second sound-absorbing cavity 181 and a second sound guide tube 182. The second sound-absorbing cavity 181 is connected to the front cavity 140 through the second sound guide tube 182. The second sound-absorbing cavity 181 and the second sound guide tube 182 can form a Helmholtz resonant cavity. The second sound-absorbing structure 180 has a second resonant frequency and a corresponding quality factor, and the structure formed by the sound outlet 210 and the back cavity 150 has a first resonant frequency. The structure of the second sound-absorbing cavity 181 is similar to that of the first sound-absorbing cavity, and the structure of the second sound guide tube 192 is similar to that of the first sound guide tube. When the sound from the front cavity enters the second sound-absorbing structure 180, the air in the second sound-absorbing cavity 181 and / or the second sound guide tube 182 resonates.

[0095] The quality factor causes the sound absorption response curve of the second sound-absorbing structure 180 to have a first resonance peak and a second resonance peak. The first resonance peak corresponds to a first frequency, and the second resonance peak corresponds to a second frequency, with the first frequency being less than the second frequency. The second resonance frequency lies between the first and second frequencies. The quality factor in resonance represents the magnitude of the resonant frequency of the oscillator relative to the bandwidth, thus determining the first and second frequencies. The second resonance frequency corresponds to the location of the sound absorption valley in the sound absorption response curve of the second sound-absorbing structure 180. The first and second resonance peaks are formed on both sides of the sound absorption valley, thus causing the second resonance frequency to lie between the first and second frequencies. The absolute value of the difference between the first resonant frequency and the first frequency is less than 1 kHz. That is, the first frequency is close to the first resonant frequency. As an example only, the difference between the first resonant frequency and the first frequency can be 0.3 kHz, 0.5 kHz, 0.9 kHz, etc.

[0096] The technical effect of setting the second sound-absorbing structure 180 is explained below with reference to Figure 12. Figure 12 is a frequency response curve of the structure formed by the pressure relief hole and the front cavity according to this specification, with and without the second sound-absorbing structure. In Figure 12, the horizontal axis is frequency (Freq, in kHz), and the vertical axis is the output sound pressure level (SPL, in dB). Due to the introduction of the second sound-absorbing structure 180, as shown in Figure 12, the peak near 4kHz in the sound absorption response curve of the comparative embodiment (the structure composed of the pressure relief hole 220 and the front cavity 140 without the second sound-absorbing structure 180) shown by the dashed line is absorbed, forming a sound absorption valley and the first and second resonance peaks raised on both sides of the sound absorption valley in the sound absorption response curve of the embodiment (the structure composed of the pressure relief hole 220 and the front cavity 140 with the second sound-absorbing structure 180) shown by the solid line. The frequency response amplitude corresponding to frequencies near the resonant frequency of the back cavity 150 will be greatly increased. Acoustic dipoles aim to keep the frequency response amplitudes of the back cavity 150 and the front cavity 140 as consistent as possible. When the second sound-absorbing structure 180 is set, since the frequency corresponding to the first resonance peak (the first frequency) is close to the first resonant frequency, the frequency response amplitudes of the front cavity 140 and the back cavity 150 will increase simultaneously for frequencies near the resonant frequency of the back cavity 150. This can satisfy the condition that the frequency response amplitudes of the front cavity 140 and the back cavity 150 are consistent over a wider range of frequencies, making the leakage reduction of the glasses 1 more ideal over a wider range of frequencies.

[0097] Figure 13 is a graph showing the far-field sound leakage curves of the glasses according to the embodiments of this specification with and without the second sound-absorbing structure. The horizontal axis in Figure 13 represents frequency (Freq, in kHz), and the vertical axis represents the output sound pressure level (SPL, in dB). The dashed line in Figure 13 shows the far-field sound leakage curve of the glasses 1 without the second sound-absorbing structure 180, and the solid line in Figure 13 shows the far-field sound leakage curve of the glasses 1 with the second sound-absorbing structure 180. As shown in Figure 13, after the second sound-absorbing structure 180 is provided, when the sound frequency is below 3.5 kHz, the sound pressure level of the far-field sound leakage is lower compared to when the second sound-absorbing structure 180 is not provided.

[0098] The basic concepts have been described above. Obviously, for those skilled in the art, the detailed disclosure above is merely illustrative and does not constitute a limitation of this specification. Although not explicitly stated herein, those skilled in the art may make various modifications, improvements, and corrections to this specification. Such modifications, improvements, and corrections are suggested in this specification and therefore remain within the spirit and scope of the exemplary embodiments described herein.

[0099] Furthermore, this specification uses specific terms to describe embodiments thereof. For example, "an embodiment," "one embodiment," and / or "some embodiments" refer to a particular feature, structure, or characteristic associated with at least one embodiment of this specification. Therefore, it should be emphasized and noted that references to "an embodiment," "one embodiment," or "an alternative embodiment" in different locations throughout this specification do not necessarily refer to the same embodiment. Moreover, certain features, structures, or characteristics in one or more embodiments of this specification can be appropriately combined.

[0100] Similarly, it should be noted that, in order to simplify the description disclosed herein and thus aid in the understanding of one or more embodiments of the invention, the foregoing description of embodiments in this specification may sometimes combine multiple features into a single embodiment, drawing, or description thereof. However, this method of disclosure does not imply that the subject matter of this specification requires more features than those mentioned in the claims. In fact, the embodiments contain fewer features than all the features of a single embodiment disclosed above.

[0101] In some embodiments, numbers describing the quantity of components and attributes are used. It should be understood that such numbers used in the description of embodiments are modified in some examples with the terms "approximately," "approximately," or "generally." Unless otherwise stated, "approximately," "approximately," or "generally" indicates that the numbers are allowed to vary by ±20%. Accordingly, in some embodiments, the numerical parameters used in the specification and claims are approximate values, which may be changed depending on the characteristics required by individual embodiments. In some embodiments, numerical parameters should take into account specified significant digits and employ a general method of digit reservation. Although the numerical ranges and parameters used to confirm their breadth of range in some embodiments of this specification are approximate values, in specific embodiments, such values ​​are set as precisely as feasible.

[0102] Finally, it should be understood that the embodiments described in this specification are merely illustrative of the principles of the embodiments described herein. Other variations may also fall within the scope of this specification. Therefore, alternative configurations of the embodiments described herein are intended to be illustrative rather than limiting, and should be considered consistent with the teachings of this specification. Accordingly, the embodiments described herein are not limited to those explicitly introduced and described herein.

Claims

1. A pair of eyeglasses, comprising: A sound-generating device, comprising a diaphragm and a magnetic circuit assembly, wherein a front cavity is formed on the side of the diaphragm facing away from the magnetic circuit assembly, and a back cavity is formed on the side of the diaphragm facing the magnetic circuit assembly; The temple houses the sound-generating device and has a sound outlet and a pressure relief hole. The sound outlet communicates with the back cavity, and the pressure relief hole communicates with the front cavity. When worn, the sound outlet is closer to the user's ear canal than the pressure relief hole, and the opening area of ​​the sound outlet is larger than the opening area of ​​the pressure relief hole. as well as The frame is attached to the temple.

2. The eyeglasses as claimed in claim 1, wherein, The sound outlet is positioned facing the ear canal opening.

3. The eyeglasses as claimed in claim 2, wherein, The pressure relief hole is located on the upper side of the temple.

4. The eyeglasses as claimed in claim 1, wherein, The centroid of the outer end face of the pressure relief hole and the centroid of the outer end face of the sound outlet hole form a first vector, and the centroid of the outer end face of the sound outlet hole and the centroid of the ear canal opening form a second vector. The angle between the straight line containing the first vector and the straight line containing the second vector is in the range of 0°-60°.

5. The eyeglasses as claimed in claim 1, wherein, The first resonant frequency range of the structure formed by the sound outlet and the back cavity is 2kHz-4kHz.

6. The eyeglasses as claimed in claim 1, wherein, The temple of the mirror is provided with a tuning hole that communicates with the back cavity. The distance between the centroid of the outer end face of the tuning hole and the centroid of the outer end face of the pressure relief hole is less than the distance between the centroid of the outer end face of the tuning hole and the centroid of the outer end face of the sound outlet hole.

7. The eyeglasses as claimed in claim 6, wherein, The second resonant frequency of the structure formed by the tuning hole, the sound outlet, and the back cavity is not less than 3kHz.

8. The eyeglasses as claimed in claim 7, wherein, The difference between the third resonant frequency and the second resonant frequency of the structure formed by the pressure relief hole and the front cavity is no greater than 2kHz.

9. The eyeglasses as claimed in claim 6, wherein, Both the tuning hole and the pressure relief hole are located on the upper side of the temple, with the tuning hole being closer to the connection between the temple and the frame than the pressure relief hole.

10. The eyeglasses as claimed in claim 6, wherein, The opening area of ​​the tuning hole is smaller than the opening area of ​​the pressure relief hole.

11. The eyeglasses as claimed in claim 10, wherein, The ratio of the opening area of ​​the tuning hole to the opening area of ​​the pressure relief hole is less than or equal to 10%.

12. The eyeglasses as claimed in any one of claims 1-11, wherein, The magnetic circuit assembly includes a magnet and a magnetically conductive element that at least partially surrounds the magnet, with a magnetic gap formed between the magnet and the magnetically conductive element. The sound-generating device further includes a voice coil connected to the diaphragm, the voice coil at least partially extending into the magnetic gap; A through hole is formed on the voice coil or the magnetic conductor.

13. The eyeglasses as claimed in claim 1, wherein, Sound-absorbing material is provided on the inner wall of the back cavity opposite to the sound outlet.

14. The eyeglasses as claimed in claim 1, wherein, The temple of the mirror is provided with a first sound-absorbing structure that is acoustically connected to the back cavity. The first sound-absorbing structure includes a first sound-absorbing cavity and a first sound guide tube. The first sound-absorbing cavity is connected to the back cavity through the first sound guide tube. The first sound-absorbing structure has a first resonant frequency. The structure formed by the sound outlet and the back cavity has a first resonant frequency. The absolute value of the difference between the first resonant frequency and the first resonant frequency is less than 1 kHz.

15. The eyeglasses as claimed in claim 1, wherein, The temple of the mirror is provided with a second sound-absorbing structure that is acoustically connected to the front cavity. The second sound-absorbing structure includes a second sound-absorbing cavity and a second sound guide tube. The second sound-absorbing cavity is connected to the front cavity through the second sound guide tube. The second sound-absorbing structure has a second resonant frequency and a corresponding quality factor. The structure formed by the sound outlet and the back cavity has a first resonant frequency. The quality factor causes the sound absorption response curve of the second sound-absorbing structure to have a first resonance peak and a second resonance peak, wherein the first frequency corresponding to the first resonance peak is less than the second frequency corresponding to the second resonance peak, and the second resonance frequency is located between the first frequency and the second frequency. The absolute value of the difference between the first resonant frequency and the frequency corresponding to the first resonance peak is less than 1 kHz.

16. The eyeglasses as claimed in claim 1, wherein, The axis of the sound outlet is inclined relative to the side wall where the sound outlet is located.

17. The eyeglasses as claimed in claim 1, wherein, The opening length of the sound outlet is greater than or equal to the opening length of the pressure relief hole.

18. The eyeglasses as claimed in claim 1, wherein, The opening width of the sound outlet is greater than or equal to the opening width of the pressure relief hole.

19. The eyeglasses as claimed in claim 1, wherein, The temple includes a wearing section and a connecting section along its length. The connecting section connects the wearing section and the frame. The lower sidewall of the connecting section and the lower sidewall of the wearing section are connected by an arc-shaped plate. At least a portion of the sound outlet is located on the arc-shaped plate.

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