WO2024087440A1 - 一种开放式耳机 - Google Patents
一种开放式耳机 Download PDFInfo
- Publication number
- WO2024087440A1 WO2024087440A1 PCT/CN2023/079404 CN2023079404W WO2024087440A1 WO 2024087440 A1 WO2024087440 A1 WO 2024087440A1 CN 2023079404 W CN2023079404 W CN 2023079404W WO 2024087440 A1 WO2024087440 A1 WO 2024087440A1
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- WIPO (PCT)
- Prior art keywords
- pressure relief
- relief hole
- sound
- center
- distance
- Prior art date
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Classifications
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- H04R1/00—Details of transducers, loudspeakers or microphones
- H04R1/10—Earpieces; Attachments therefor ; Earphones; Monophonic headphones
- H04R1/105—Earpiece supports, e.g. ear hooks
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- H04R1/10—Earpieces; Attachments therefor ; Earphones; Monophonic headphones
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- H—ELECTRICITY
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- H04R1/00—Details of transducers, loudspeakers or microphones
- H04R1/02—Casings; Cabinets ; Supports therefor; Mountings therein
- H04R1/021—Casings; Cabinets ; Supports therefor; Mountings therein incorporating only one transducer
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- H—ELECTRICITY
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- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R1/00—Details of transducers, loudspeakers or microphones
- H04R1/02—Casings; Cabinets ; Supports therefor; Mountings therein
- H04R1/025—Arrangements for fixing loudspeaker transducers, e.g. in a box, furniture
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- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
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- H04R1/1016—Earpieces of the intra-aural type
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- H04R1/10—Earpieces; Attachments therefor ; Earphones; Monophonic headphones
- H04R1/1058—Manufacture or assembly
- H04R1/1066—Constructional aspects of the interconnection between earpiece and earpiece support
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- H04R1/20—Arrangements for obtaining desired frequency or directional characteristics
- H04R1/22—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired frequency characteristic only
- H04R1/28—Transducer mountings or enclosures modified by provision of mechanical or acoustic impedances, e.g. resonator, damping means
- H04R1/2807—Enclosures comprising vibrating or resonating arrangements
- H04R1/2815—Enclosures comprising vibrating or resonating arrangements of the bass reflex type
- H04R1/2823—Vents, i.e. ports, e.g. shape thereof or tuning thereof with damping material
- H04R1/2826—Vents, i.e. ports, e.g. shape thereof or tuning thereof with damping material for loudspeaker transducers
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- H04R7/00—Diaphragms for electromechanical transducers; Cones
- H04R7/02—Diaphragms for electromechanical transducers; Cones characterised by the construction
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- H04R7/06—Plane diaphragms comprising a plurality of sections or layers
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- H04R7/02—Diaphragms for electromechanical transducers; Cones characterised by the construction
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- H04R7/127—Non-planar diaphragms or cones dome-shaped
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- H04R7/16—Mounting or tensioning of diaphragms or cones
- H04R7/18—Mounting or tensioning of diaphragms or cones at the periphery
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- H04R2201/00—Details of transducers, loudspeakers or microphones covered by H04R1/00 but not provided for in any of its subgroups
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- H04R2460/09—Non-occlusive ear tips, i.e. leaving the ear canal open, for both custom and non-custom tips
Definitions
- the present application relates to the field of acoustics, and in particular to an open-type earphone.
- acoustic devices e.g., headphones
- Open-ear headphones are a portable audio output device that achieves sound conduction within a specific range.
- open-ear headphones have the characteristics of not blocking or covering the ear canal, allowing users to obtain sound information from the external environment while listening to music, improving safety and comfort.
- the output performance of open-ear headphones has a great impact on the user's comfort.
- an open earphone comprising: a sound-emitting part, including a transducer and a shell for accommodating the transducer, wherein the transducer includes a diaphragm; an ear hook, wherein in a worn state, the first part of the ear hook is hung between the user's auricle and the head, and the second part of the ear hook extends to the side of the auricle away from the head and is connected to the sound-emitting part to fix the sound-emitting part at a position near the ear canal but not blocking the ear canal, wherein a sound outlet hole is provided on the inner side surface of the shell facing the auricle, for directing the sound generated by the front side of the diaphragm out of the shell and transmitting it to the ear canal, and at least two pressure relief holes are provided on the other side walls of the shell, and the at least two pressure relief holes include a first pressure relief hole and a second pressure relief hole, and
- the distance between the center of the sound outlet hole and the perpendicular midplane of the line connecting the center of the first pressure relief hole and the center of the second pressure relief hole is 0 mm to 2 mm.
- the first pressure relief hole is opened on the upper side of the shell, and the second pressure relief hole is opened on the lower side of the shell.
- the shell in the worn state, is at least partially inserted into the concha cavity, and the distance between the center of the second pressure relief hole and the rear side of the shell is greater than the distance between the center of the first pressure relief hole and the rear side.
- the distance between the center of the first pressure relief hole and the inner side of the shell facing the auricle ranges from 4.24 mm to 6.38 mm.
- the distance between the center of the first pressure relief hole and the rear side surface ranges from 10.44 mm to 15.68 mm.
- the transducer includes a magnetic circuit component, which is used to provide a magnetic field, and the distance between the center of the first pressure relief hole and the bottom surface of the magnetic circuit component ranges from 1.31 mm to 1.98 mm.
- the transducer includes a magnetic circuit component, which is used to provide a magnetic field, and the distance between the center of the first pressure relief hole and the center plane of the long axis of the magnetic circuit component ranges from 5.45 mm to 8.19 mm.
- the distance between the center of the second pressure relief hole and the inner side of the shell facing the auricle ranges from 13.51 mm to 20.27 mm.
- the transducer includes a magnetic circuit component
- the magnetic circuit component is used to provide a magnetic field
- the distance between the center of the second pressure relief hole and the bottom surface of the magnetic circuit component ranges from 1.31 mm to 1.98 mm.
- the transducer includes a magnetic circuit component, which is used to provide a magnetic field, and the distance between the center of the second pressure relief hole and the center plane of the long axis of the magnetic circuit component ranges from 5.46 mm to 8.20 mm.
- the shell in the worn state, is at least partially inserted into the concha cavity, and the area of the second pressure relief hole is smaller than the area of the first pressure relief hole.
- the area of the first pressure relief hole ranges from 3.78 mm 2 to 22.07 mm 2
- the area of the second pressure relief hole ranges from 2.78 mm 2 to 16.07 mm 2 .
- the ratio of the area of the first pressure relief hole to the area of the upper side surface is between 0.036-0.093, and the ratio of the area of the second pressure relief hole to the area of the lower side surface is between 0.018-0.051.
- the transducer includes a magnetic circuit component, the magnetic circuit component is used to provide a magnetic field, the first pressure relief hole and the second pressure relief hole
- the overlapping area of the projections of the holes on the center plane of the major axis of the magnetic circuit assembly is not greater than 10.77 mm 2 .
- the length of a line connecting the projection points of the center of the first pressure relief hole and the center of the second pressure relief hole on the plane where the bottom surface of the magnetic circuit assembly is located ranges from 8.51 mm to 15.81 mm.
- the angle between the connecting line and the short axis direction of the shell is in the range of 12.85°-23.88°.
- the shell when worn, the shell at least partially covers the antihelix, and the difference between the distance from the center of the second pressure relief hole on the lower side to the rear side of the shell and the distance from the center of the first pressure relief hole on the upper side to the rear side is less than 10%.
- the distance between the center of the first pressure relief hole and the inner side of the shell facing the auricle ranges from 4.43 mm to 7.96 mm, or the distance between the center of the second pressure relief hole and the inner side ranges from 4.43 mm to 7.96 mm.
- the distance between the center of the first pressure relief hole and the rear side surface ranges from 8.60 mm to 12.92 mm, or the distance between the center of the second pressure relief hole and the rear side surface ranges from 8.60 mm to 12.92 mm.
- the ratio of the major axis dimension of the first pressure relief hole to the minor axis dimension of the first pressure relief hole ranges from 1 to 8
- the ratio of the major axis dimension of the second pressure relief hole to the minor axis dimension of the second pressure relief hole ranges from 1 to 8.
- the first distance is 5.12 mm to 15.11 mm.
- the distance between the projection point of the center of the first pressure relief hole on the sagittal plane and the projection point of the midpoint of the upper boundary of the inner side surface on the sagittal plane is no more than 2 mm.
- the distance between the projection point of the midpoint of the upper boundary of the inner side surface on the sagittal plane and the projection point of the center of the ear canal opening of the ear canal on the sagittal plane ranges from 12 mm to 18 mm.
- the distance between the projection point of the center of the first pressure relief hole on the sagittal plane and the projection point of the center of the ear canal opening on the sagittal plane ranges from 12 mm to 18 mm.
- the distance between the projection point of the center of the second pressure relief hole on the sagittal plane and the projection point of the center of the ear canal opening on the sagittal plane ranges from 6.88 mm to 10.32 mm.
- the distance between the projection point of the center of the second pressure relief hole on the sagittal plane and the projection point of the midpoint of the upper boundary of the inner side surface on the sagittal plane ranges from 14.4 mm to 21.6 mm.
- the distance between the projection point of the center of the first pressure relief hole on the sagittal plane and the projection point of the 1/3 point of the lower boundary of the inner side surface on the sagittal plane ranges from 13.76 mm to 20.64 mm.
- the distance between the projection point of the center of the second pressure relief hole on the sagittal plane and the projection point of the 1/3 point of the lower boundary of the inner side surface on the sagittal plane ranges from 8.16 mm to 12.24 mm.
- the distance between the projection point of the 1/3 point of the lower border of the medial surface on the sagittal plane and the projection point of the ear canal opening on the sagittal plane ranges from 1.76 mm to 2.64 mm.
- the distance between the first pressure relief hole and any point on the second part of the ear hook in the long axis direction of the sound emission length ranges from 5.28 mm to 13.02 mm.
- an open-type earphone comprising: a sound-emitting part, comprising a transducer and a shell for accommodating the transducer, wherein the transducer comprises a diaphragm; an ear hook, wherein in a worn state, the first part of the ear hook is hung between the auricle and the head of the user, and the second part of the ear hook extends to the side of the auricle away from the head and is connected to the sound-emitting part to fix the sound-emitting part at a position near the ear canal but not blocking the ear canal, wherein a sound outlet hole is provided on the inner side surface of the shell facing the auricle, for guiding the sound generated by the front side of the diaphragm out of the shell and transmitting it to the ear canal, and at least two pressure relief holes are provided on the other side walls of the shell, and the at least two pressure relief holes include a first pressure relief hole and a second pressure relief hole
- an open-type earphone comprising: a sound-emitting part, comprising a transducer and a shell for accommodating the transducer, wherein the transducer comprises a diaphragm; an ear hook, wherein in a worn state, a first part of the ear hook is hung between the auricle and the head of the user, and a second part of the ear hook extends to the side of the auricle away from the head and is connected to the sound-emitting part to fix the sound-emitting part at a position near the ear canal but not blocking the ear canal, wherein a sound outlet hole is provided on the inner side surface of the shell facing the auricle, for guiding the sound generated by the front side of the diaphragm out of the shell and transmitting it to the ear canal, and at least two pressure relief holes are provided on the other side walls of the shell, and the at least two pressure relief holes include a first pressure relief hole and a second pressure
- FIG. 1 is a schematic diagram of an exemplary ear according to some embodiments of the present application.
- FIG2 is an exemplary structural diagram of an open-type earphone according to some embodiments of the present application.
- FIG3 is a schematic diagram of two point sound sources and a listening position according to some embodiments of the present application.
- FIG4 is a comparison diagram of sound leakage index of a single-point sound source and a double-point sound source at different frequencies according to some embodiments of the present application;
- FIG5 is a schematic diagram of an exemplary distribution of a baffle disposed between two sound sources of a dipole sound source according to some embodiments of the present application;
- FIG6 is a diagram of sound leakage index with and without a baffle between two sound sources of a dipole sound source according to some embodiments of the present application.
- FIG7 is an exemplary wearing diagram of an open-type headset according to some embodiments of the present application.
- FIG8 is a schematic diagram of the structure of the open-type earphone shown in FIG7 facing the ear;
- FIG9 is a schematic structural diagram of the housing shown in FIG8 ;
- FIG10 is a schematic diagram of an exemplary distribution of a cavity structure arranged around one of the dipole sound sources according to some embodiments of the present application.
- FIG11A is a schematic diagram of a listening principle of a dipole sound source structure and a cavity structure constructed around one of the dipole sound sources according to some embodiments of the present application;
- FIG. 11B is a schematic diagram of a sound leakage principle of a dipole sound source structure and a cavity structure constructed around one of the dipole sound sources according to some embodiments of the present application;
- FIG12A is a schematic diagram of a cavity structure with two horizontal openings according to some embodiments of the present application.
- FIG12B is a schematic diagram of a cavity structure with two vertical openings according to some embodiments of the present application.
- FIG13 is a comparison diagram of listening index curves of a cavity structure with two openings and one opening according to some embodiments of the present application.
- FIG14 is an exemplary wearing diagram of an open-type headset according to other embodiments of the present application.
- FIG15 is a schematic diagram of the structure of the open-type earphone shown in FIG14 facing the ear;
- FIG16 is a schematic structural diagram of a housing of an open-type earphone according to some embodiments of the present application.
- FIG. 17 is a frequency response curve diagram of open-type headphones corresponding to first pressure relief holes of different areas according to some embodiments of the present application.
- FIG. 18 is a frequency response curve diagram of open-type headphones corresponding to second pressure relief holes of different areas according to some embodiments of the present application.
- FIG19 is a schematic diagram of a projection on a sagittal plane of an open-type earphone in a wearing state according to some embodiments of the present application.
- FIG20A is a diagram showing an exemplary internal structure of a sound-emitting part according to some embodiments of the present application.
- FIG20B is an exemplary structural diagram of a second acoustic cavity according to some embodiments of the present specification.
- FIG. 20C is a frequency response curve diagram of the rear cavity corresponding to angles ⁇ of different sizes according to some embodiments of this specification;
- FIG21 is an exemplary internal structure diagram of a transducer according to some embodiments of the present application.
- FIG. 22 is a schematic diagram of the shell of the open-type earphone along the Z direction on the plane where the bottom surface of the magnetic circuit assembly is located.
- system means for distinguishing different components, elements, parts, portions or assemblies at different levels.
- device means for distinguishing different components, elements, parts, portions or assemblies at different levels.
- unit means for distinguishing different components, elements, parts, portions or assemblies at different levels.
- the words can be replaced by other expressions.
- connection may refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection; direct connection, indirect connection through an intermediate medium, internal connection between two elements, or interaction between two elements, unless otherwise clearly defined.
- connection may refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection; direct connection, indirect connection through an intermediate medium, internal connection between two elements, or interaction between two elements, unless otherwise clearly defined.
- FIG. 1 is a schematic diagram of an exemplary ear according to some embodiments of the present application.
- the ear 100 (also referred to as the auricle) may include an external auditory canal 101, a concha cavity 102, a cymba concha 103, a triangular fossa 104, an antihelix 105, a scaphoid 106, an auricle 107, an earlobe 108, a tragus 109, and an auricle crus 1071.
- the acoustic device may be supported by one or more parts of the ear 100 to achieve stability in wearing the acoustic device.
- the external auditory canal 101, the concha cavity 102, the cymba concha 103, the triangular fossa 104, and other parts have a certain depth and volume in three-dimensional space, which can be used to achieve the wearing requirements of the acoustic device.
- an acoustic device e.g., an in-ear headset
- the wearing of an acoustic device may be achieved by means of other parts of the ear 100 other than the external auditory canal 101.
- the acoustic device can be worn by means of the cymba concha 103, the triangular fossa 104, the antihelix 105, the scaphoid 106, the helix 107 and other parts or their combination.
- it in order to improve the comfort and reliability of the acoustic device in wearing, it can also be further used by means of the user's earlobe 108 and other parts.
- the user's external auditory canal 101 can be "liberated".
- the acoustic device When the user wears the acoustic device (for example, an open earphone), the acoustic device will not block the user's external auditory canal 101 (or ear canal or ear canal opening), and the user can receive both the sound from the acoustic device and the sound from the environment (for example, horn sounds, car bells, surrounding human voices, traffic control sounds, etc.), thereby reducing the probability of traffic accidents.
- the acoustic device can be designed into a structure adapted to the ear 100 according to the structure of the ear 100, so as to realize the wearing of the sound-generating part of the acoustic device at various different positions of the ear.
- the open-type earphone may include a suspension structure (e.g., an ear hook) and a sound-emitting part, the sound-emitting part is physically connected to the suspension structure, and the suspension structure may be adapted to the shape of the auricle, so as to place the entirety or a portion of the structure of the sound-emitting part in front of the tragus 109 (e.g., the area J surrounded by the dotted line in FIG. 1 ).
- a suspension structure e.g., an ear hook
- the sound-emitting part is physically connected to the suspension structure
- the suspension structure may be adapted to the shape of the auricle, so as to place the entirety or a portion of the structure of the sound-emitting part in front of the tragus 109 (e.g., the area J surrounded by the dotted line in FIG. 1 ).
- the entirety or a portion of the structure of the sound-emitting part may contact the upper part of the external auditory canal 101 (e.g., the location of one or more parts such as the cymba concha 103, the triangular fossa 104, the antihelix 105, the scaphoid 106, the helix 107, and the crus helix 1071).
- the entire or partial structure of the sound-producing part may be located in a cavity formed by one or more parts of the ear 100 (for example, the cavum concha 102, the cymba concha 103, the triangular fossa 104, etc.) (for example, the area M1 surrounded by the dotted line in FIG. 1 which includes at least the cymba concha 103 and the triangular fossa 104, and the area M2 which includes at least the cavum concha 102).
- the cavum concha 102 for example, the cavum concha 102, the cymba concha 103, the triangular fossa 104, etc.
- this application will mainly use an ear model with a "standard" shape and size as a reference to further describe the wearing method of the acoustic device in different embodiments on the ear model.
- a simulator containing a head and its (left and right) ears such as GRAS 45BC KEMAR, can be made based on ANSI: S3.36, S3.25 and IEC: 60318-7 standards as a reference for wearing an acoustic device, thereby presenting the scene of most users wearing the acoustic device normally.
- the ear used as a reference may have the following relevant characteristics: the size of the projection of the auricle on the sagittal plane in the vertical axis direction may be in the range of 49.5mm-74.3mm, and the size of the projection of the auricle on the sagittal plane in the sagittal axis direction may be in the range of 36.6mm-55mm. Therefore, in this application, descriptions such as “user wears”, “in a wearing state” and “in a wearing state” may refer to the acoustic device described in this application being worn on the ear of the aforementioned simulator. Of course, taking into account the individual differences among different users, the structure, shape, size, thickness, etc.
- the acoustic device may be designed differently. These differentiated designs may be manifested in that the characteristic parameters of one or more parts of the acoustic device (for example, the sound-emitting part, ear hook, etc. mentioned below) may have different ranges of values to adapt to different ears.
- the sagittal plane refers to a plane perpendicular to the ground along the front-to-back direction of the body, which divides the human body into left and right parts
- the coronal plane refers to a plane perpendicular to the ground along the left-to-right direction of the body, which divides the human body into front and back parts
- the horizontal plane refers to a plane parallel to the ground along the vertical direction perpendicular to the body, which divides the human body into upper and lower parts.
- the sagittal axis refers to an axis along the front-to-back direction of the body and perpendicular to the coronal plane
- the coronal axis refers to an axis along the left-to-right direction of the body and perpendicular to the sagittal plane
- the vertical axis refers to an axis along the up-down direction of the body and perpendicular to the horizontal plane.
- the "front side of the ear" described in this application is a concept relative to the "back side of the ear", the former refers to the side of the ear away from the head, and the latter refers to the side of the ear facing the head.
- FIG. 2 is an exemplary structural diagram of an open-type earphone according to some embodiments of the present application.
- the open earphone 10 may include but is not limited to air conduction earphones and bone air conduction earphones.
- the open earphone 10 can be combined with glasses, headphones, head-mounted display devices, AR/VR helmets and other products.
- the open earphone 10 may include a sound-emitting portion 11 and an ear hook 12 .
- the sound-generating part 11 can be worn on the user's body, and the sound-generating part 11 can generate sound to input the user's ear canal.
- the sound-generating part 11 may include a transducer (e.g., the transducer 116 shown in FIG. 20A ) and a housing 111 for accommodating the transducer.
- the housing 111 may be connected to the ear hook 12.
- the transducer is used to convert an electrical signal into a corresponding mechanical vibration to generate sound.
- a sound outlet 112 is provided on the side of the housing facing the auricle, and the sound outlet 112 is used to guide the sound generated by the transducer out of the housing 111 and then transmit it to the ear canal, so that the user can hear the sound.
- the transducer e.g., a diaphragm
- the transducer can separate the housing 111 into a front cavity (e.g., the front cavity 114 shown in FIG. 20A ) and a rear cavity of the earphone, and the sound outlet 112 can communicate with the front cavity, and guide the sound generated by the front cavity out of the housing 111 and then transmit it to the ear canal.
- a front cavity e.g., the front cavity 114 shown in FIG. 20A
- the sound outlet 112 can communicate with the front cavity, and guide the sound generated by the front cavity out of the housing 111 and then transmit it to the ear canal.
- part of the sound derived through the sound outlet 112 can be propagated to the ear canal so that the user can hear the sound, and the other part can be propagated to the outside of the open earphone 10 and the ear together with the sound reflected by the ear canal through the gap between the sound-emitting part 11 and the ear (for example, the part of the concha cavity not covered by the sound-emitting part 11), thereby forming a first sound leakage in the far field; at the same time, one or more pressure relief holes 113 are generally provided on other sides of the shell 111 (for example, the side away from or away from the user's ear canal), and the pressure relief holes 113 are farther away from the ear canal than the sound outlet 112.
- the sound propagated from the pressure relief holes 113 generally forms a second sound leakage in the far field, and the intensity of the aforementioned first sound leakage is equivalent to the intensity of the aforementioned second sound leakage, and the phase of the aforementioned first sound leakage and the phase of the aforementioned second sound leakage are (close to) opposite to each other, so that the two can cancel each other out in the far field, which is beneficial to reduce the sound leakage of the open earphone 10 in the far field.
- at least two pressure relief holes 113 can be provided on other sides of the shell 111.
- the sound generated by the rear cavity be exported out of the housing 111, but also the high pressure area of the sound field in the rear cavity can be destroyed, so that the wavelength of the standing wave in the rear cavity becomes shorter, and the resonant frequency of the sound exported from the pressure relief hole 113 to the outside of the housing 111 is as high as possible, for example, greater than 4kHz.
- the sound derived from the sound outlet 112 and the sound derived from the pressure relief hole 113 can maintain good consistency in a wider frequency range, and the effect of the far-field interference and cancellation of the two is better, thereby obtaining a better sound leakage reduction effect.
- At least two pressure relief holes 113 may include a first pressure relief hole and a second pressure relief hole (for example, the first pressure relief hole 1131 and the second pressure relief hole 1132 in FIG. 7), and the two pressure relief holes 113 may be located on opposite sides of the housing 111, for example, arranged opposite to each other in the following short axis direction Y, in order to destroy the high pressure area of the sound field in the rear cavity to the greatest extent.
- the sound transmitted to the ear canal through the sound outlet 112 is mainly heard.
- the pressure relief hole 113 is mainly used to balance the pressure in the back cavity so that the low frequency and large amplitude can fully vibrate, which makes the sound sound as good as possible with bass diving and treble penetration, and reduces the sound leaking to the environment through the sound outlet 112.
- the sound-emitting part 11 please refer to other places in this application, such as Figure 7, Figure 14, Figure 20A, etc. and their descriptions.
- the ear hook 12 can be connected to the sound-emitting part 11, and the other end thereof extends along the junction of the user's ear and head.
- the ear hook 12 can be an arc-shaped structure adapted to the user's auricle, so that the ear hook 12 can be hung at the user's auricle.
- the ear hook 12 can have an arc-shaped structure adapted to the junction of the user's head and ear, so that the ear hook 12 can be hung between the user's ear and head.
- the ear hook 12 can also be a clamping structure adapted to the user's auricle, so that the ear hook 12 can be clamped at the user's auricle.
- the ear hook 12 may include a hook-shaped portion (the first portion 121 shown in FIG. 7) and a connecting portion (the second portion 122 shown in FIG. 7) connected in sequence.
- the connecting portion connects the hook-shaped portion and the sound-emitting portion 11, so that the open earphone 10 is curved in three-dimensional space when it is in a non-wearing state (that is, a natural state).
- the hook-shaped portion, the connecting portion, and the sound-emitting portion 11 are not coplanar.
- the hook-shaped portion can be mainly used to hang between the back side of the user's ear and the head, and the sound-emitting portion 11 can be mainly used to contact the front side of the user's ear, thereby allowing the sound-emitting portion 11 and the hook-shaped portion to cooperate to clamp the ear.
- the connecting portion can extend from the head to the outside of the head, and then cooperate with the hook-shaped portion to provide the sound-emitting portion 11 with a pressing force on the front side of the ear.
- the sound-emitting portion 11 can specifically press against the areas where the cavum concha 102, the hymen concha 103, the triangular fossa 104, the antihelix 105 and other parts are located, so that the open earphone 10 does not block the external auditory canal 101 of the ear when it is in the wearing state.
- the open earphone 10 in order to improve the stability of the open earphone 10 in the wearing state, can adopt any one of the following methods or a combination thereof.
- the ear hook 12 is configured as a contoured structure that fits at least one of the back side of the ear 100 and the head, so as to increase the contact area between the ear hook 12 and the ear 100 and/or the head, thereby increasing the resistance of the open earphone 10 to fall off from the ear 100.
- At least a portion of the ear hook 12 is configured as an elastic structure so that it has a certain amount of deformation in the wearing state, so as to increase the positive pressure of the ear hook 12 on the ear and/or the head, thereby increasing the resistance of the open earphone 10 to fall off from the ear.
- at least a portion of the ear hook 12 is configured to abut against the head in the wearing state, so as to form a reaction force that presses the ear, so that the sound-emitting portion 11 is pressed against the front side of the ear, thereby increasing the resistance of the open earphone 10 to fall off from the ear.
- the sound-emitting part 11 and the ear hook 12 are configured to clamp the area where the antihelix and the area where the concha cavity are located from the front and back sides of the ear when worn, thereby increasing the resistance of the open earphone 10 to falling off the ear.
- the sound-emitting part 11 or the auxiliary structure connected thereto is configured to at least partially extend into the concha cavity, the cymba concha, the triangular fossa and the scaphoid cavity, thereby increasing the resistance of the open earphone 10 to falling off the ear. resistance.
- the ear hook 12 may include but is not limited to an ear hook, an elastic band, etc., so that the open-type earphone 10 can be better fixed on the user to prevent the user from falling off during use.
- the open-type earphone 10 may not include the ear hook 12, and the sound-emitting part 11 may be fixed near the user's ear 100 by hanging or clamping.
- the sound-emitting portion 11 may be, for example, a regular or irregular shape such as a ring, an ellipse, a runway, a polygon, a U-shape, a V-shape, a semicircle, etc., so that the sound-emitting portion 11 can be directly mounted on the ear 100 of the user.
- the sound-emitting portion 11 may have a long axis direction X and a short axis direction Y that are perpendicular to the thickness direction Z and orthogonal to each other.
- the long axis direction X can be defined as the direction with the largest extension dimension in the shape of the two-dimensional projection surface of the sound-emitting portion 11 (for example, the projection of the sound-emitting portion 11 on the plane where its outer side surface is located, or the projection on the sagittal plane) (for example, when the projection shape is a rectangle or an approximate rectangle, the long axis direction is the length direction of the rectangle or the approximate rectangle).
- the short axis direction Y can be defined as the direction perpendicular to the long axis direction X in the shape of the projection of the sound-emitting portion 11 on the sagittal plane (for example, when the projection shape is a rectangle or an approximate rectangle, the short axis direction is the width direction of the rectangle or the approximate rectangle).
- the thickness direction Z can be defined as a direction perpendicular to the two-dimensional projection surface, for example, consistent with the direction of the coronal axis, both pointing to the left and right directions of the body.
- the sound-emitting part 11 when the user wears the open earphone 10, the sound-emitting part 11 can be fixed near the user's external auditory canal 101 but not blocking the auditory canal.
- the projection of the open earphone 10 on the sagittal plane may not cover the user's auditory canal.
- the projection of the sound-emitting part 11 on the sagittal plane may fall on the left and right sides of the head and on the sagittal axis of the human body at a position in front of the tragus (such as the position shown in the solid line frame A in FIG2 ).
- the sound-emitting part 11 is located in front of the user's tragus, the long axis of the sound-emitting part 11 can be in a vertical or approximately vertical state, the projection of the short axis direction Y on the sagittal plane is consistent with the direction of the sagittal axis, the projection of the long axis direction X on the sagittal plane is consistent with the vertical axis direction, and the thickness direction Z is perpendicular to the sagittal plane.
- the projection of the sound-emitting part 11 on the sagittal plane may fall on the antihelix 105 (such as the position shown in the dotted line frame C in FIG2 ).
- the sound-emitting part 11 is at least partially located at the antihelix 105, the long axis of the sound-emitting part 11 is in a horizontal or approximately horizontal state, the projection of the long axis direction X of the sound-emitting part 11 on the sagittal plane is consistent with the direction of the sagittal axis, the projection of the short axis direction Y on the sagittal plane is consistent with the vertical axis direction, and the thickness direction Z is perpendicular to the sagittal plane.
- the sound-emitting part 11 can be prevented from covering the ear canal, thereby freeing the user's ears; the contact area between the sound-emitting part 11 and the ear 100 can also be increased, thereby improving the wearing comfort of the open earphone 10.
- the projection of the open earphone 10 on the sagittal plane may also cover or at least partially cover the ear canal of the user.
- the projection of the sound-emitting part 11 on the sagittal plane may fall within the concha cavity 102 (e.g., the position shown in the dotted box B in FIG. 2 ), and contact the helix crus 1071 and/or the helix 107.
- the sound-emitting part 11 is at least partially located within the concha cavity 102, and the sound-emitting part 11 is in an inclined state.
- the projection of the short axis direction Y of the sound-emitting part 11 on the sagittal plane may have a certain angle with the direction of the sagittal axis, that is, the short axis direction Y is also inclined accordingly, and the projection of the long axis direction X on the sagittal plane may have a certain angle with the direction of the sagittal axis, that is, the long axis direction X is also inclined, and the thickness direction Z is perpendicular to the sagittal plane.
- the concha cavity 102 has a certain volume and depth, there is a certain distance between the inner side IS of the open earphone 10 and the concha cavity, and the ear canal can be connected to the outside world through the gap between the inner side IS and the concha cavity, thereby freeing the user's ears.
- the sound-emitting portion 11 and the concha cavity can cooperate to form an auxiliary cavity (for example, the cavity structure mentioned below) that is connected to the ear canal.
- the sound outlet 112 can be at least partially located in the auxiliary cavity, and the sound output from the sound outlet 112 will be restricted by the auxiliary cavity, that is, the auxiliary cavity can gather the sound so that the sound can be more transmitted into the ear canal, thereby increasing the volume and quality of the sound heard by the user in the near field, thereby improving the acoustic effect of the open earphone 10.
- the open-type earphones 10 may also include a battery assembly, a Bluetooth assembly, etc. or a combination thereof.
- the battery assembly can be used to power the open-type earphones 10.
- the Bluetooth assembly can be used to wirelessly connect the open-type earphones 10 to other devices (e.g., mobile phones, computers, etc.).
- FIG3 is a schematic diagram of two point sound sources and a listening position according to some embodiments of the present application.
- sound can be transmitted to the outside of the open earphone 10 through the sound outlet 112, which can be regarded as a monopole sound source (or point sound source) A1, to generate a first sound;
- sound can be transmitted to the outside of the open earphone 10 through the pressure relief hole 113, which can be regarded as a monopole sound source (or point sound source) A2, to generate a second sound, and the second sound can be opposite or approximately opposite in phase to the first sound, so that they can cancel each other in the far field, that is, to form an "acoustic dipole" to reduce sound leakage.
- the line connecting the two monopole sound sources can point to the ear canal (referred to as the "listening position") so that the user can hear a sufficiently loud sound.
- the sound pressure at the listening position (referred to as Pear) can be used to characterize the strength of the sound heard by the user (i.e., the near-field listening sound pressure).
- the sound pressure on the sphere centered on the user's listening position or on the sphere centered on the dipole sound source (A1 and A2 as shown in FIG.
- Pfar can be counted, which can be used to characterize the strength of the sound leakage radiated to the far field by the open earphone 10 (i.e., the far-field sound leakage sound pressure).
- Pfar can be obtained by a variety of statistical methods, such as taking the average sound pressure at each point on the sphere, or, for example, Take the sound pressure distribution at each point on the spherical surface and perform area integration.
- the method for measuring sound leakage in the present application is only an exemplary explanation of the principle and effect, and is not limited.
- the measurement and calculation method of sound leakage can also be reasonably adjusted according to the actual situation. For example, with the center of the dipole sound source as the center of the circle, the sound pressure amplitude of two or more points in the far field is evenly averaged according to a certain spatial angle.
- the listening measurement method can be to select a position point near the point sound source as the listening position, and use the sound pressure amplitude measured at the listening position as the listening value.
- the listening position may be on the line connecting the two point sound sources, or may not be on the line connecting the two point sound sources.
- the measurement and calculation method of listening can also be reasonably adjusted according to the actual situation, for example, the sound pressure amplitude of other points or more than one point in the near field position is averaged. For another example, with a certain point sound source as the center of the circle, the sound pressure amplitude of two or more points in the near field is evenly averaged according to a certain spatial angle. In some embodiments, the distance between the near-field listening position and the point sound source is much smaller than the distance between the point sound source and the far-field sound leakage measurement sphere.
- the sound pressure Pear transmitted to the user's ear by the open-type earphone 10 should be large enough to improve the listening effect; the sound pressure Pfar in the far field should be small enough to increase the sound leakage reduction effect. Therefore, the sound leakage index ⁇ can be used as an indicator to evaluate the sound leakage reduction ability of the open-type earphone 10:
- Fig. 4 is a comparison chart of the sound leakage index of a single-point sound source and a double-point sound source at different frequencies according to some embodiments of the present application.
- the double-point sound source (also referred to as a dipole sound source) in Fig. 4 can be a typical double-point sound source, that is, the spacing is fixed, the two-point sound source amplitudes are the same, and the two-point sound sources are opposite in phase.
- the typical double-point sound source is selected only for the principle and effect description, and the parameters of each point sound source can be adjusted according to actual needs to make it have certain differences from the typical double-point sound source. As shown in Fig.
- the sound leakage generated by the double-point sound source increases with the increase of frequency, and the ability to reduce sound leakage weakens with the increase of frequency.
- the frequency is greater than a certain frequency value (for example, about 8000Hz as shown in Fig. 4)
- this frequency for example, 8000Hz is the upper limit frequency at which the double-point sound source can reduce sound leakage.
- a baffle may be provided between the sound outlet 112 and the pressure relief hole 113 .
- FIG5 is an exemplary distribution diagram of a baffle plate between two sound sources of a dipole sound source according to some embodiments of the present application.
- a baffle plate when a baffle plate is provided between a point sound source A1 and a point sound source A2, in the near field, the sound wave of the point sound source A2 needs to bypass the baffle plate to interfere with the sound wave of the point sound source A1 at the listening position, which is equivalent to increasing the sound path from the point sound source A2 to the listening position.
- the amplitude difference between the sound waves of the point sound source A1 and the point sound source A2 at the listening position increases compared to the case where no baffle plate is provided, thereby reducing the degree of cancellation of the two-way sound at the listening position, thereby increasing the volume at the listening position.
- the sound waves generated by the point sound source A1 and the point sound source A2 do not need to bypass the baffle plate to interfere in a larger spatial range (similar to the case without a baffle plate), the sound leakage in the far field will not increase significantly compared to the case where there is no baffle plate. Therefore, by providing a baffle structure around one of the point sound sources A1 and A2, the volume at the near-field listening position can be significantly increased without significantly increasing the volume of far-field sound leakage.
- FIG6 is a diagram of the sound leakage index when a baffle is set and when no baffle is set between the two sound sources of the dipole sound source shown in some embodiments of the present application.
- the sound leakage index is much smaller than when no baffle is added, that is, at the same listening volume, the sound leakage in the far field is smaller than when there is no baffle, and the sound leakage reduction capability is significantly enhanced.
- Fig. 7 is an exemplary wearing diagram of an open-type earphone according to some embodiments of the present application.
- Fig. 8 is a structural diagram of the open-type earphone shown in Fig. 7 facing the ear.
- Fig. 9 is a structural diagram of the housing of the open-type earphone shown in Fig. 7.
- the ear hook 12 is an arc-shaped structure that fits the junction of the user's head and the ear 100.
- the sound-emitting part 11 (or the shell 111 of the sound-emitting part 11) may have a connection end CE connected to the ear hook 12 and a free end FE not connected to the ear hook 12.
- the first part 121 of the ear hook 12 (for example, the hook-shaped part of the ear hook 12) is hung between the user's auricle (for example, the helix 107) and the head, and the second part 122 of the ear hook 12 (for example, the connection part of the ear hook) extends to the side of the auricle away from the head and is connected to the connection end CE of the sound-emitting part 11, so as to fix the sound-emitting part 11 in a position near the ear canal but not blocking the ear canal.
- the first part 121 of the ear hook 12 for example, the hook-shaped part of the ear hook 12
- the second part 122 of the ear hook 12 extends to the side of the auricle away from the head and is connected to the connection end CE of the sound-emitting part 11, so as to fix the sound-emitting part 11 in a position near the ear canal but not blocking the ear canal.
- the sound-emitting portion 11 may have an inner side surface IS (also referred to as the inner side surface of the housing 111) facing the ear in the thickness direction Z in the wearing state and an outer side surface OS (also referred to as the outer side surface of the housing 111) facing away from the ear, and a connection between the inner side surface and the outer side surface.
- the connecting surface of the side surface IS and the outer surface OS can be set to a circular, elliptical, rounded square, rounded rectangle, etc. shape when observed along the direction of the coronal axis (i.e., the thickness direction Z).
- the above-mentioned connecting surface can refer to the arc-shaped side of the sound-emitting part 11; and when the sound-emitting part 11 is set to a rounded square, rounded rectangle, etc. shape, the above-mentioned connecting surface can include the lower side surface LS (also referred to as the lower side surface of the shell 111), the upper side surface US (also referred to as the upper side surface of the shell 111) and the rear side surface RS (also referred to as the rear side surface of the shell 111) mentioned later.
- the upper side surface US and the lower side surface LS can refer to the side of the sound-emitting part 11 away from the external auditory canal 101 and the side close to the external auditory canal 101 along the short axis direction Y in the wearing state respectively;
- the rear side surface RS can refer to the side of the sound-emitting part 11 facing the back of the brain along the length direction X in the wearing state.
- this specification takes the sound-emitting part 11 as a rounded rectangle as an example for exemplary description.
- the length of the sound-emitting portion 11 in the long axis direction X may be greater than the width of the sound-emitting portion 11 in the short axis direction Y.
- the rear side surface RS of the earphone may be a curved surface.
- a transducer may be provided in the sound-generating part 11, which can convert an electrical signal into a corresponding mechanical vibration to generate sound.
- the transducer e.g., a diaphragm
- the transducer can separate the housing 111 into a front cavity and a rear cavity of the earphone.
- the sound generated in the front cavity and the rear cavity are in opposite phases.
- a sound outlet hole 112 connected to the front cavity is provided on the inner side IS to guide the sound generated in the front cavity out of the housing 111 and then transmit it to the ear canal so that the user can hear the sound.
- One or more pressure relief holes 113 connected to the rear cavity may be provided on other sides of the housing 111 (e.g., the outer side OS, the upper side US, or the lower side LS, etc.) to guide the sound generated in the rear cavity out of the housing 111 and then interfere with the sound leaked through the sound outlet hole 112 in the far field.
- the pressure relief hole 113 is farther away from the ear canal than the sound outlet hole 112 to reduce the anti-phase cancellation between the sound output through the pressure relief hole 113 and the sound output through the sound outlet hole 112 at the listening position (e.g., the ear canal), thereby increasing the sound volume at the listening position.
- At least two pressure relief holes 113 may be provided on other sides of the housing 111 (e.g., the outer side OS, the upper side US, or the lower side LS, etc.).
- the provision of at least two pressure relief holes 113 may destroy the standing wave in the rear cavity, so that the resonance frequency of the sound exported from the pressure relief hole 113 to the outside of the housing 111 is as high as possible, so that the frequency response of the rear cavity has a wider flat area (e.g., the area before the resonance peak), and obtains a better sound leakage reduction effect in the mid-high frequency range (e.g., 2kHz-6kHz).
- the pressure relief hole 113 may include a first pressure relief hole 1131 and a second pressure relief hole 1132.
- the second pressure relief hole 1132 may be closer to the sound outlet hole 112 relative to the first pressure relief hole 1131.
- the first pressure relief hole 1131 and the second pressure relief hole 1132 may be provided on the same side of the housing 111, for example, the first pressure relief hole 1131 and the second pressure relief hole 113 may be provided on the outer side OS, the upper side US, or the lower side LS at the same time.
- first pressure relief hole 1131 and the second pressure relief hole 1132 may be respectively disposed on two different sides of the shell 111, for example, the first pressure relief hole 1131 may be disposed on the outer side surface OS, and the second pressure relief hole 1132 may be disposed on the upper side surface US, or the first pressure relief hole 1131 may be disposed on the outer side surface OS, and the second pressure relief hole 1132 may be disposed on the lower side surface LS.
- the two pressure relief holes 113 may be located on opposite sides of the shell 111, for example, the first pressure relief hole 1131 may be disposed on the upper side surface US, and the second pressure relief hole 1132 may be disposed on the lower side surface LS.
- this specification will take the example of the first pressure relief hole 1131 being disposed on the upper side surface US and the second pressure relief hole 1132 being disposed on the lower side surface LS for exemplary description.
- the first pressure relief hole 1131 and the second pressure relief hole 1132 should be as far away from the sound outlet hole 112 as possible.
- the center of the sound outlet hole 112 can be located on or near the median perpendicular plane of the line connecting the center of the first pressure relief hole 1131 and the center of the second pressure relief hole 1132.
- the center of the sound outlet hole 112 can be 0 mm to 2 mm away from the median perpendicular plane of the line connecting the center of the first pressure relief hole 1131 and the center of the second pressure relief hole 1132.
- the area of the second pressure relief hole 1132 can be reduced to reduce the intensity of the sound output from the second pressure relief hole 1132 and transmitted to the ear canal.
- the area of the second pressure relief hole 1132 can be smaller than the area of the first pressure relief hole 1131 (as shown in FIG. 16).
- the long axis direction X of the sound-emitting portion 11 can be set horizontally or approximately horizontally (similar to the position C shown in FIG2 ), at which time the sound-emitting portion 11 is at least partially located at the antihelix 105, and the free end FE of the sound-emitting portion 11 can face the back of the brain.
- the sound-emitting portion 11 is in a horizontal or approximately horizontal state, the projection of the long axis direction X of the sound-emitting portion 11 on the sagittal plane can be consistent with the direction of the sagittal axis, the projection of the short axis direction Y on the sagittal plane can be consistent with the vertical axis direction, and the thickness direction Z is perpendicular to the sagittal plane.
- the inner side IS of the shell 111 can be crimped against the surface of the ear 100 (for example, the antihelix 105) to increase the resistance of the open earphone 10 to fall off the ear 100.
- the projection of the sound outlet 112 on the sagittal plane may partially or completely overlap with the projection of the concave structure of the ear (e.g., the hymena concha 103) on the sagittal plane.
- the hymena concha 103 is connected to the cavum concha 102, The ear canal is located in the concha cavity 102.
- the long axis dimension of the sound-emitting portion 11 cannot be too long. If it is too long, the projection of the free end FE on the sagittal plane will exceed the projection of the ear on the sagittal plane, affecting the fit between the sound-emitting portion 11 and the ear. Therefore, the long axis dimension of the sound-emitting portion 11 can be designed so that the projection of the free end FE on the sagittal plane does not exceed the projection of the helix 107 on the sagittal plane.
- each side wall of the shell 111 has a certain thickness, and therefore, the sound outlet hole 112 and the pressure relief hole 113 are holes with a certain depth.
- the sound outlet hole 112 and the pressure relief hole 113 may both have an inner opening and an outer opening.
- the center O of the sound outlet hole 112 described above and below may refer to the centroid of the outer opening of the sound hole 112
- the center of the pressure relief hole 113 described above and below may refer to the centroid of the outer opening of the pressure relief hole 113
- the center O1 of the first pressure relief hole 1131 may refer to the centroid of the outer opening of the first pressure relief hole 1131
- the center O2 of the second pressure relief hole 1132 may refer to the centroid of the outer opening of the second pressure relief hole 1132
- the area of the sound hole 112 and the pressure relief hole 113 can indicate the area of the outer opening of the sound hole 112 and the pressure relief hole 113 (for example, the outer opening area of the sound hole 112 on the inner side surface IS, the outer opening area of the first pressure relief hole 1131 on the upper side surface US, and the outer opening area of the second pressure relief hole 1132 on the lower side surface LS).
- the area of the sound hole 112 and the pressure relief hole 113 can also indicate other cross-sectional areas of the sound hole 112 and the pressure relief hole 113, such as the area of the inner opening of the sound hole 112 and/or the pressure relief hole 113, or the average of the inner opening area and the outer opening area of the sound hole 112 and/or the pressure relief hole 113.
- the sound outlet 112 connected to the front cavity can be regarded as the point sound source A1 shown in Figure 5
- the pressure relief hole 113 connected to the rear cavity (for example, the first pressure relief hole 1131 and/or the second pressure relief hole 1132) can be regarded as the point sound source A2 shown in Figure 5
- the ear canal can be regarded as the listening position shown in Figure 5.
- At least part of the shell and/or at least part of the auricle of the sound-emitting part 11 can be regarded as the baffle shown in Figure 5 to increase the sound path difference between the sound outlet 112 and the first pressure relief hole 1131 and/or the second pressure relief hole 1132 to the ear canal, thereby increasing the sound intensity at the ear canal while maintaining the effect of reducing far-field leakage sound.
- the open earphone 10 adopts the structure shown in FIG. 7 , that is, when at least part of the shell 111 is located at the anti-helix 105, in terms of the listening effect, the sound waves of the sound outlet 112 can directly reach the ear canal.
- the sound outlet 112 can be set on the inner side surface IS near the lower side surface LS, and at least one pressure relief hole can be set at a position away from the sound outlet 112.
- the first pressure relief hole 1131 can be set on the outer side surface OS or the upper side surface US away from the sound outlet 112.
- the sound waves of the first pressure relief hole 1131 need to bypass the outside of the sound-emitting part 11 in order to interfere with the sound waves of the sound outlet 112 in the ear canal.
- the convex and concave structure on the auricle for example, the anti-helix, tragus, etc. on its propagation path
- the sound-emitting part 11 itself and/or at least part of the auricle is equivalent to a baffle between the sound-emitting hole 112 and the first pressure relief hole 1131.
- the baffle increases the sound path from the first pressure relief hole 1131 to the ear canal and reduces the intensity of the sound waves of the first pressure relief hole 1131 in the ear canal, thereby reducing the degree of cancellation of the sounds emitted by the sound-emitting hole 112 and the first pressure relief hole 1131 in the ear canal, thereby increasing the volume of the ear canal.
- the sound waves generated by the sound-emitting hole 112 and the first pressure relief hole 1131 and/or the second pressure relief hole 1132 do not need to bypass the sound-emitting part 11 itself within a larger spatial range to interfere (similar to the case without a baffle), the sound leakage will not increase significantly. Therefore, by setting the sound-emitting hole 112 and the first pressure relief hole 1131 and the second pressure relief hole 1132 at appropriate positions, the volume of the ear canal can be significantly improved without significantly increasing the sound leakage volume.
- the first pressure relief hole 1131 and the second pressure relief hole 1132 can be approximately symmetrically distributed relative to the long axis center plane of the sound-emitting part 11 (for example, the plane NN' perpendicular to the inner side of the paper as shown in FIG8).
- the difference between the distance a2 of the center O2 of the second pressure relief hole 1132 on the lower side surface LS from the rear side surface RS and the distance a1 of the center O1 of the first pressure relief hole 1131 on the upper side surface US from the rear side surface RS is less than 10%.
- the difference between the distance a2 of the center O2 of the second pressure relief hole 1132 on the lower side surface LS from the rear side surface RS and the distance a1 of the center O1 of the first pressure relief hole 1131 on the upper side surface US from the rear side surface RS is less than 5 %. In some embodiments, the difference between the distance a2 from the center O2 of the second pressure relief hole 1132 on the lower side surface LS to the rear side surface RS and the distance a1 from the center O1 of the first pressure relief hole 1131 on the upper side surface US to the rear side surface RS is less than 2%.
- the rear side surface RS of the headset may be a curved surface.
- the distance from a certain position (for example, the center O1 of the first pressure relief hole 1131) to the rear side surface RS may refer to the distance from the position to the section of the rear side surface RS parallel to the minor axis.
- the second pressure relief hole 1132 on the lower side surface LS should be arranged as far away from the sound outlet hole 112 as possible, so that the effect of the sound emitted by the second pressure relief hole 1132 canceling out the sound emitted by the sound outlet hole 112 at the listening position (i.e., the ear canal) is weakened, thereby increasing the volume at the listening position. Therefore, when the sound outlet hole 112 is arranged close to the lower side surface LS and the connecting end CE, the second pressure relief hole 1132 can be arranged close to the rear side surface RS, so that the distance between the sound outlet hole 112 and the second pressure relief hole 1132 is as large as possible.
- the distance a2 from the center O2 of the second pressure relief hole 1132 to the rear side surface RS can range from 8.60 mm to 20.27 mm. In some embodiments, the distance a2 from the center O2 of the second pressure relief hole 1132 to the rear side surface RS may be in the range of 8.60 mm to 12.92 mm. In some embodiments, the distance a2 from the center O2 of the second pressure relief hole 1132 to the rear side surface RS may be in the range of 9.60 mm to 11.92 mm.
- the free end FE may contact the ear (e.g., the helix 107), causing part of the upper side surface US and/or the lower side surface LS to be blocked by the ear.
- the distance a2 from the center O2 of the second pressure relief hole 1132 to the rear side surface RS may be in the range of 10.10 mm to 11.42 mm.
- the distance a2 between the center O2 of the second pressure relief hole 1132 and the rear side surface RS may be in the range of 10.30 mm to 11.12 mm. More preferably, the distance a2 between the center O2 of the second pressure relief hole 1132 and the rear side surface RS may be in the range of 10.60 mm to 11.82 mm.
- the distance a1 from the center O1 of the first pressure relief hole 1131 to the rear side surface RS may be in the range of 8.60 mm to 15.68 mm. In some embodiments, the distance a1 from the center O1 of the first pressure relief hole 1131 to the rear side surface RS may be in the range of 8.60 mm to 12.92 mm.
- the distance a1 from the center O1 of the first pressure relief hole 1131 to the rear side surface RS may be in the range of 9.60 mm to 11.92 mm.
- the distance a1 from the center O1 of the first pressure relief hole 1131 to the rear side surface RS may be in the range of 10.10 mm to 11.42 mm .
- the distance a1 between the center O1 of the first pressure relief hole 1131 and the rear side surface RS may be in the range of 10.30 mm to 11.12 mm.
- the distance a1 between the center O1 of the first pressure relief hole 1131 and the rear side surface RS may be in the range of 10.60 mm to 11.82 mm.
- the first pressure relief hole 1131 may be further away from the sound outlet hole 112 than the second pressure relief hole 1132, and because the gap between the ear 100 and the inner side surface IS is smaller, the sound generated by the first pressure relief hole 1131 is more difficult to transmit to the ear canal than the second pressure relief hole 1132. Therefore, in some embodiments, the distance between the center O1 of the first pressure relief hole 1131 and the rear side surface RS may be smaller than the distance between the center O2 of the second pressure relief hole 1132 and the rear side surface RS.
- the distance between the center O1 of the first pressure relief hole 1131 and the rear side surface RS ranges from 10.44 mm to 15.68 mm, and the distance between the center O2 of the second pressure relief hole 1132 and the rear side surface RS ranges from 13.51 mm to 20.27 mm.
- the size of the open earphone 10 in the thickness direction Z can be increased, thereby improving the sound generation efficiency of the open earphone 10 (i.e., the listening volume at the listening position).
- the first pressure relief hole 1131 and/or the second pressure relief hole 1132 can be arranged away from the inner side surface IS, thereby further increasing the sound path from the first pressure relief hole 1131 and/or the second pressure relief hole 1132 to the ear canal, thereby improving the sound generation efficiency of the open earphone 10.
- the overall size of the sound-generating portion 11 cannot be too large (for example, the size of the sound-generating portion 11 in the Z direction cannot be too large), otherwise the overall mass of the open earphone 10 will increase, affecting the wearing comfort of the user.
- the distance d 1 from the center O 1 of the first pressure relief hole 1131 to the inner side surface IS ranges from 4.24 mm to 7.96 mm.
- the distance d1 between the center O1 of the first pressure relief hole 1131 and the inner side IS ranges from 4.43 mm to 7.96 mm.
- the distance d1 between the center O1 of the first pressure relief hole 1131 and the inner side IS ranges from 5.43 mm to 6.96 mm.
- the first pressure relief hole 1131 and/or the second pressure relief hole 1132 can be arranged away from the inner side IS.
- the sound path from the first pressure relief hole 1131 and/or the second pressure relief hole 1132 to the ear canal can be further increased, thereby improving the sound generation efficiency of the open earphone 10.
- the distance d1 between the center O1 of the first pressure relief hole 1131 and the inner side surface IS ranges from 5.63 mm to 7.96 mm. In some embodiments, the distance d1 between the center O1 of the first pressure relief hole 1131 and the inner side surface IS ranges from 6.25 mm to 7.56 mm.
- the distance d2 from the center O2 of the second pressure relief hole 1132 to the inner side surface IS may be the same as the distance d1 from the center O1 of the first pressure relief hole 1131 to the inner side surface IS. In some embodiments, the distance d2 from the center O2 of the second pressure relief hole 1132 to the inner side surface IS ranges from 4.43 mm to 7.96 mm. In some embodiments, the distance d2 from the center O2 of the second pressure relief hole 1132 to the inner side surface IS ranges from 5.43 mm to 6.96 mm. In some embodiments, the distance d2 from the center O2 of the second pressure relief hole 1132 to the inner side surface IS ranges from 5.63 mm to 7.96 mm. In some embodiments, the distance d2 from the center O2 of the second pressure relief hole 1132 to the inner side surface IS ranges from 6.25 mm to 7.56 mm.
- the second pressure relief hole 1132 is closer to the inner side surface IS than the first pressure relief hole 1131.
- the second pressure relief hole 1132 can be farther away from the inner side surface IS than the first pressure relief hole 1131, that is, the distance d2 from the center O2 of the second pressure relief hole 1132 to the inner side surface IS can be different from the distance d1 from the center O1 of the first pressure relief hole 1131 to the inner side surface IS.
- the distance d1 from the center O1 of the first pressure relief hole 1131 to the inner side surface IS ranges from 5.63 mm to 6.5 mm
- a distance d 2 between the center O 2 of the second pressure relief hole 1132 and the inner side surface IS ranges from 6.5 mm to 7.56 mm.
- the description of the above-mentioned open earphone 10 is for illustrative purposes only and is not intended to limit the scope of the present application.
- the pressure relief hole can be any one of the first pressure relief hole 1131 and the second pressure relief hole 1132.
- the pressure relief hole can be the first pressure relief hole 1131, that is, the pressure relief hole can be provided on the upper side US.
- the distance range from the center of the pressure relief hole to the inner side IS can be 4.24 mm to 7.96 mm, and the distance range from the center of the pressure relief hole to the rear side RS can be 8.60 mm to 15.68 mm.
- a cavity structure in order to increase the listening volume, especially the listening volume of mid- and low-frequency sounds, while still retaining the effect of far-field leakage cancellation, can be constructed around one of the double-point sound sources.
- Figure 10 is an exemplary distribution diagram of a cavity structure arranged around one of the dipole sound sources shown in some embodiments of the present application.
- the cavity structure 41 when a cavity structure 41 is provided between the dipole sound sources, one of the dipole sound sources and the listening position is inside the cavity structure 41, and the other dipole sound source is outside the cavity structure 41.
- the sound derived from the dipole sound source inside the cavity structure 41 will be restricted by the cavity structure 41, that is, the cavity structure 41 can gather the sound so that the sound can be more propagated to the listening position, thereby improving the volume and quality of the sound at the listening position.
- the "cavity structure” can be understood as a semi-enclosed structure surrounded by the side wall of the sound-emitting part 11 and the concha cavity structure, and the semi-enclosed structure makes the interior not completely sealed and isolated from the external environment, but has a leakage structure 42 (for example, an opening, a gap, a pipe, etc.) that is acoustically connected to the external environment.
- a leakage structure 42 for example, an opening, a gap, a pipe, etc.
- Exemplary leakage structures may include but are not limited to openings, gaps, pipes, etc., or any combination thereof.
- the cavity structure 41 may include a listening position and at least one sound source.
- “include” may mean that at least one of the listening position and the sound source is inside the cavity, or at least one of the listening position and the sound source is at the edge of the cavity.
- the listening position may be the entrance of the ear canal, or may be the acoustic reference point of the ear.
- Fig. 11A is a schematic diagram of the listening principle of a dipole sound source structure and a cavity structure built around one of the dipole sound sources according to some embodiments of the present application.
- Fig. 11B is a schematic diagram of the sound leakage principle of a dipole sound source structure and a cavity structure built around one of the dipole sound sources according to some embodiments of the present application.
- a dipole with a cavity structure is constructed around one of the sound sources. Since one of the sound sources A is wrapped by the cavity structure, most of the sound radiated by it will reach the listening position by direct radiation or reflection. In contrast, in the absence of a cavity structure, most of the sound radiated by the sound source will not reach the listening position. Therefore, the setting of the cavity structure significantly increases the volume of the sound reaching the listening position. At the same time, only a small part of the anti-phase sound radiated by the anti-phase sound source B outside the cavity structure will enter the cavity structure through the leakage structure of the cavity structure.
- the sound generated by the secondary sound source B' has a weak anti-phase cancellation effect on the sound source A in the cavity, which significantly increases the listening volume at the listening position.
- the sound source A radiates sound to the outside through the leakage structure of the cavity, which is equivalent to generating a secondary sound source A' at the leakage structure. Since almost all the sound radiated by the sound source A is output from the leakage structure, and the structural scale of the cavity is much smaller than the spatial scale of the sound leakage evaluation (at least one order of magnitude difference), it can be considered that the intensity of the secondary sound source A' is equivalent to that of the sound source A.
- the sound cancellation effect generated by the secondary sound source A' and the sound source B is equivalent to the sound cancellation effect generated by the sound source A and the sound source B. That is, under this cavity structure, a considerable sound leakage reduction effect is still maintained.
- the leakage structure of the above-mentioned one opening is only an example, and the leakage structure of the cavity structure may include one or more openings, which can also achieve a better listening index, wherein the listening index may refer to the inverse of the leakage index ⁇ , 1/ ⁇ .
- the listening index may refer to the inverse of the leakage index ⁇ , 1/ ⁇ .
- Equal openings are equivalent to doubling the relative opening size of only one hole (i.e., the ratio of the opening area S of the leakage structure on the cavity structure to the area S0 directly affected by the contained sound source in the cavity structure). As mentioned above, its overall listening index will decrease. In the case of equal opening ratio, even if S/S0 is the same as the structure with only one hole, the distances from the two openings to the external sound source are different, which will also result in different listening indexes.
- FIG12A is a schematic diagram of a cavity structure with two horizontal openings according to some embodiments of the present application.
- FIG12B is a schematic diagram of a cavity structure with two vertical openings according to some embodiments of the present application.
- the distances from the two openings to the external sound source are respectively maximum and minimum;
- the two lines are perpendicular (i.e., two vertical openings), the distances from the two openings to the external sound source are equal and take an intermediate value.
- FIG13 is a comparison of the listening index curves of a cavity structure with two openings and one opening according to some embodiments of the present application. As shown in FIG13 , the overall listening index of the cavity structure with equal openings is lower than that of the cavity structure with one opening. For the cavity structure with equal opening ratio, since the distances from the two openings to the external sound source are different, different listening indexes will also be caused. It can be seen from FIG. 12A, FIG. 12B and FIG. 13 that, regardless of the horizontal opening or the vertical opening, the listening index of the leakage structure with equal opening ratio is higher than that of the leakage structure with equal opening ratio.
- the listening index of the horizontal opening is larger.
- the distance from one of the openings to the external sound source in the leakage structure with horizontal opening is smaller than the distance between the two sound sources, so the secondary sound source formed in this way is closer to the external sound source than the original two sound sources, so the listening index is higher, thereby improving the effect of reducing leakage sound. Therefore, in order to improve the effect of reducing leakage sound, the distance from at least one opening to the external sound source can be made smaller than the distance between the two sound sources.
- a cavity structure with two openings can better improve the resonant frequency of the air sound in the cavity structure than a cavity structure with one opening, so that the entire device has a better listening index in the high frequency band (for example, the sound with a frequency close to 10,000 Hz) than a cavity structure with only one opening.
- the high frequency band is the frequency band that the human ear is more sensitive to, so there is a greater demand for reduced leakage sound. Therefore, in order to improve the effect of reducing leakage sound in the high frequency band, a cavity structure with more than 1 opening can be selected.
- Fig. 14 is an exemplary wearing diagram of an open-type earphone according to some other embodiments of the present application.
- Fig. 15 is a structural diagram of the open-type earphone shown in Fig. 14 facing the ear.
- the open-type earphone 10 shown in FIG14 is similar in structure to the open-type earphone 10 shown in FIG7 , for example, the ear hook 12 is an arc-shaped structure that fits the junction between the user's head and the ear 100.
- the sound-emitting portion 11 (or the housing 111 of the sound-emitting portion 11) may have a connection end CE connected to the ear hook 12 and a free end FE not connected to the ear hook 12.
- the first part 121 of the ear hook 12 (for example, the hook-shaped part of the ear hook 12) is hung between the user's auricle (for example, the helix 107) and the head, and the second part 122 of the ear hook 12 (for example, the connection part of the ear hook) extends to the side of the auricle away from the head and is connected to the connection end CE of the sound-emitting portion 11, so as to fix the sound-emitting portion 11 at a position near the ear canal but not blocking the ear canal.
- the first part 121 of the ear hook 12 for example, the hook-shaped part of the ear hook 12
- the second part 122 of the ear hook 12 (for example, the connection part of the ear hook) extends to the side of the auricle away from the head and is connected to the connection end CE of the sound-emitting portion 11, so as to fix the sound-emitting portion 11 at a position near the ear canal but not blocking the ear canal.
- the open-type earphone 10 shown in FIG14 is similar in structure to the open-type earphone 10 shown in FIG7 , and the main difference is that the sound-emitting portion 11 is tilted, and the housing 111 of the sound-emitting portion 11 is at least partially inserted into the concha cavity 102, for example, the free end FE of the sound-emitting portion 11 can extend into the concha cavity 102.
- the ear hook 12 and the sound-emitting portion 11 of such a structure have a better fit with the user's ear 100, and can increase the resistance of the open-type earphone 10 to fall off the ear 100, thereby increasing the wearing stability of the open-type earphone 10.
- connection end CE of the sound-emitting portion 11 when worn, is closer to the top of the head than the free end FE when observed along the thickness direction Z, so that the free end FE can be inserted into the concha cavity. Based on this, the angle between the short axis direction Y and the direction of the sagittal axis of the human body can be between 30° and 40°.
- the aforementioned angle is too small, it is easy to cause the free end FE to be unable to extend into the concha cavity, and the sound outlet hole 112 on the sound-emitting portion 11 is too far away from the ear canal; if the aforementioned angle is too large, it is also easy to cause the sound-emitting portion 11 to be unable to extend into the concha cavity, and the ear canal is blocked by the sound-emitting portion 11.
- such a setting allows the sound-emitting portion 11 to extend into the concha cavity, and the sound outlet hole 112 on the sound-emitting portion 11 has a suitable distance from the ear canal, so that the user can hear more of the sound produced by the sound-emitting portion 11 when the ear canal is not blocked.
- the sound-emitting portion 11 and the ear hook 12 can clamp the ear region corresponding to the concha cavity from both the front and rear sides of the ear region, thereby increasing the resistance of the open-type earphone 10 to fall off the ear, thereby improving the stability of the open-type earphone 10 in the wearing state.
- the free end FE of the sound-emitting portion 11 is pressed in the concha cavity in the thickness direction Z.
- the free end FE abuts against the concha cavity in the major axis direction X and the minor axis direction Y.
- the two ends of the second part 122 of the ear hook 12 can be connected to the first part 121 of the ear hook 12 and the connection end CE of the sound-emitting part 11, respectively (as shown in FIG. 15 ).
- the second part 122 of the ear hook 12 can have a lowest point P and a highest point Q along the short axis direction Y of the sound-emitting part 11.
- the distance h1 between the center of the first pressure relief hole 1131 and the lowest point P in the long axis direction X of the sound-emitting part 11 can be 5.28 mm to 7.92 mm.
- the distance h2 between the center of the first pressure relief hole 1131 and the highest point Q in the long axis direction X of the sound-emitting part 11 can be 8.68 mm to 13.02 mm.
- the distance between the center of the first pressure relief hole 1131 and any point on the second part 122 of the ear hook 12 in the long axis direction X of the sound-emitting part 11 ranges from 5.28 mm to 14 mm. In some embodiments, the distance between the center of the first pressure relief hole 1131 and any point on the second part 122 of the ear hook in the long axis direction X of the sound-emitting part 11 ranges from 5.28 mm to 13.02 mm.
- the distance between the center of the first pressure relief hole 1131 and any point on the second part 122 of the ear hook in the long axis direction X of the sound-emitting part 11 ranges from 6.58 mm to 12.02 mm. In some embodiments, the distance between the center of the first pressure relief hole 1131 and any point on the second part 122 of the ear hook in the long axis direction X of the sound-emitting part 11 ranges from 7.58 mm to 10.02 mm. In some embodiments, the distance between the center of the first pressure relief hole 1131 and any point on the second part 122 of the ear hook in the long axis direction X of the sound-emitting part 11 ranges from 8.58 mm to 9.02 mm.
- the cavity enclosed by the inner side surface IS of the sound-emitting portion 11 and the concha cavity 103 can be regarded as the cavity structure 41 shown in FIG. 10
- the gap formed between the inner side surface IS and the concha cavity (for example, the gap formed between the inner side surface IS and the concha cavity near the top of the head)
- the first leakage structure UC, the second leakage structure LC formed between the inner side surface IS and the ear near the ear canal) can be regarded as the leakage structure 42 as shown in FIG10.
- the sound outlet hole 112 arranged on the inner side surface IS can be regarded as a point sound source inside the cavity structure 41 as shown in FIG10, and the pressure relief holes 113 (for example, the first pressure relief hole 1131 and the second pressure relief hole 1132) arranged on other sides of the sound-emitting part 11 (for example, the upper side surface US and/or the lower side surface LS) can be regarded as point sound sources outside the cavity structure 41 as shown in FIG10. Therefore, according to the relevant description of FIGS.
- the sound outlet hole 112 can output the sound to the outside through the gap and cancel the sound generated by the pressure relief hole 113 (for example, the first pressure relief hole 1131 and the second pressure relief hole 1132) in the far field, thereby ensuring the sound leakage reduction effect.
- the first pressure relief hole 1131 and the second pressure relief hole 1132 are staggered in the X direction so that the first pressure relief hole 1131 and the second pressure relief hole 1132 are not blocked by the tragus.
- the distance between the center O 1 of the first pressure relief hole 1131 and the center O 2 of the second pressure relief hole 1132 may be 7mm-15.2mm. In some embodiments, the distance between the center O 1 of the first pressure relief hole 1131 and the center O 2 of the second pressure relief hole 1132 may be 8mm-13mm. In some embodiments, the distance between the center O 1 of the first pressure relief hole 1131 and the center O 2 of the second pressure relief hole 1132 may be 12.64mm.
- the distance between the center O 1 of the first pressure relief hole 1131 and the center O 2 of the second pressure relief hole 1132 may be 7.5mm-14mm. In some embodiments, the distance between the center O 1 of the first pressure relief hole 1131 and the center O 2 of the second pressure relief hole 1132 may be 12mm-13mm. In some embodiments, the distance between the center O 1 of the first pressure relief hole 1131 and the center O 2 of the second pressure relief hole 1132 may be 13 mm-15.2 mm.
- the first pressure relief hole 1131 and the second pressure relief hole 1132 should be as far away from the sound outlet hole 112 as possible.
- the center of the sound outlet hole 112 can be located on or near the median perpendicular plane of the line connecting the center of the first pressure relief hole 1131 and the center of the second pressure relief hole 1132.
- the relationship between the distance O1 between the center of the first pressure relief hole 1131 and the center O of the sound outlet hole 112 (also referred to as the first distance) and the distance O2 between the center of the second pressure relief hole 1132 and the center O of the sound outlet hole 112 (also referred to as the second distance) can be determined so that the center O of the sound outlet hole 112 is approximately on the perpendicular midplane of the line O1O2 .
- the difference between the first distance and the second distance is less than 10%.
- the difference between the first distance and the second distance is less than 8%.
- the difference between the first distance and the second distance is less than 5%.
- the difference between the first distance and the second distance is less than 2%.
- the distance between the first pressure relief hole 1131 and the second pressure relief hole 1132 and the sound outlet hole 112 cannot be too close.
- the distance between the center O1 of the first pressure relief hole 1131 and the center O of the sound outlet hole 112 may be 4mm-15.11mm. In some embodiments, the distance between the center O1 of the first pressure relief hole 1131 and the center O of the sound outlet hole 112 may be 4mm-15mm.
- the distance between the center O1 of the first pressure relief hole 1131 and the center O of the sound outlet hole 112 may be 5.12mm-15.11mm. In some embodiments, the distance between the center O1 of the first pressure relief hole 1131 and the center O of the sound outlet hole 112 may be not less than 5mm-14mm. In some embodiments, the distance between the center O1 of the first pressure relief hole 1131 and the center O of the sound outlet hole 112 may be no less than 6mm-13mm. In some embodiments, the distance between the center O1 of the first pressure relief hole 1131 and the center O of the sound outlet hole 112 may be no less than 7mm-12mm.
- the distance between the center O1 of the first pressure relief hole 1131 and the center O of the sound outlet hole 112 may be no less than 8mm-10mm. In some embodiments, the distance between the center O1 of the first pressure relief hole 1131 and the center O of the sound outlet hole 112 may be 9.55mm. In some embodiments, the distance between the center O2 of the second pressure relief hole 1132 and the center O of the sound outlet hole 112 may be 4mm-16.1mm. In some embodiments, the distance between the center O2 of the second pressure relief hole 1132 and the center O of the sound outlet hole 112 may be no less than 4mm-15mm.
- the distance between the center O2 of the second pressure relief hole 1132 and the center O of the sound outlet hole 112 may be no less than 5mm-14mm. In some embodiments, the distance between the center O 2 of the second pressure relief hole 1132 and the center O of the sound outlet hole 112 may be 5.12 mm-16.1 mm. In some embodiments, the distance between the center O 2 of the second pressure relief hole 1132 and the center O of the sound outlet hole 112 may be no less than 6 mm-13 mm. In some embodiments, the distance between the center O 2 of the second pressure relief hole 1132 and the center O of the sound outlet hole 112 may be no less than 7 mm-12 mm.
- the distance between the center O 2 of the second pressure relief hole 1132 and the center O of the sound outlet hole 112 may be no less than 8 mm-10 mm. In some embodiments, the distance between the center O 2 of the second pressure relief hole 1132 and the center O of the sound outlet hole 112 may be 9.15 mm.
- the line O1O between the center O1 of the first pressure relief hole 1131 and the center O of the sound outlet hole 112 and the line O2O between the second pressure relief hole 1131 and the sound outlet hole 112 can be reduced.
- the angle between the line O 1 O and the line O 2 O is in the range of 46.40°-114.04°.
- the angle between the line O 1 O and the line O 2 O is in the range of 46.40°-90.40°.
- the angle between the line O 1 O and the line O 2 O is in the range of 46.40°-70.04°. In some embodiments, the angle between the line O 1 O and the line O 2 O is in the range of 46.40°-60.04°. In some embodiments, the angle between the line O 1 O 2 between the center O 1 of the first pressure relief hole 1131 and the center O 2 of the second pressure relief hole 1132 and the line O 2 O is in the range of 19.72°-101.16°. In some embodiments, the angle between the connecting line O 1 O 2 and the connecting line O 2 O ranges from 19.71° to 97.75°.
- the first pressure relief hole 1131 is farther away from the connection end CE than the second pressure relief hole 1132. Since the center of the sound outlet hole 112 is located on or near the median perpendicular plane of the line connecting the center of the first pressure relief hole 1131 and the center of the second pressure relief hole 1132, the sound outlet hole 112 is located on the side of the shell 111 close to the second pressure relief hole 1132 in the Y direction rather than in the middle (as shown in FIG. 16). Since the sound outlet hole 112 is arranged close to the ear canal, the second pressure relief hole 1132 is closer to the ear canal, and the first pressure relief hole 1131 is farther from the ear canal.
- the sound waves transmitted from the second pressure relief hole 1132 are more likely to offset the sound waves transmitted from the sound outlet hole 112 in the near field. Therefore, compared with the first pressure relief hole 1131, the size of the second pressure relief hole 1132 can be smaller to reduce the sound leakage of the second pressure relief hole 1132, that is, the area of the second pressure relief hole 1132 can be smaller than the area of the first pressure relief hole 1131. In some embodiments, in order to ensure that the frequency response curves of the first pressure relief hole 1131 and the second pressure relief hole 1132 are as close as possible to achieve a better sound-absorbing effect, the difference in area between the first pressure relief hole 1131 and the second pressure relief hole 1132 should not be too large.
- the ratio of the inner opening area of the second pressure relief hole 1132 to that of the first pressure relief hole 1131 is not greater than 0.9. In some embodiments, the ratio of the inner opening area of the second pressure relief hole 1132 to that of the first pressure relief hole 1131 is not greater than 0.8. In some embodiments, the ratio of the inner opening area of the second pressure relief hole 1132 to that of the first pressure relief hole 1131 is not greater than 0.7. In some embodiments, the ratio of the inner opening area of the second pressure relief hole 1132 to that of the first pressure relief hole 1131 is not greater than 0.6. In some embodiments, the ratio of the inner opening area of the second pressure relief hole 1132 to that of the first pressure relief hole 1131 can be 0.55.
- the sound hole 112 in the configuration of FIG. 14 , for example, in order to make the sound hole 112 closer to the user's ear canal, the sound hole 112 can be closer to the lower end of the sound-emitting portion 11 in the Y direction, that is, the lower side surface LS where the second pressure relief hole 1132 is located (as shown in FIG. 16 ).
- the distance between the sound hole 112 and the first pressure relief hole 1131 in the Y direction is greater than the distance between the sound hole 112 and the second pressure relief hole 1132 in the Y direction, so as to avoid the sound waves propagated through the sound hole 112 and the first pressure relief hole 1131 to cancel each other in the near field, which is conducive to increasing the volume of the sound propagated through the sound hole 112 heard by the user.
- the second pressure relief hole 1132 is closer to the connection end CE than the sound hole 112, so as to increase the distance between the two in the X direction, thereby avoiding the sound waves propagated through the sound hole 112 and the second pressure relief hole 1132 to cancel each other in the near field, which is conducive to increasing the volume of the sound propagated through the sound hole 112 heard by the user.
- the difference between the distance between the center O of the sound outlet hole 112 and the center O 1 of the first pressure relief hole 1131 in the Y direction and the distance between the center O of the sound outlet hole 112 and the center O 2 of the second pressure relief hole 1132 may be 2 mm-10 mm, and the difference between the distance between the center O 2 of the second pressure relief hole 1132 and the connection end CE in the X direction and the distance between the center O of the sound outlet hole 112 and the connection end CE may be 2 mm-15 mm.
- the difference between the distance between the center O of the sound outlet hole 112 and the center O 1 of the first pressure relief hole 1131 in the Y direction and the distance between the center O of the sound outlet hole 112 and the center O 2 of the second pressure relief hole 1132 may be 3 mm-9 mm, and the difference between the distance between the center O 2 of the second pressure relief hole 1132 and the connection end CE in the X direction and the distance between the center O of the sound outlet hole 112 and the connection end CE may be 4 mm-12 mm.
- the difference between the distance between the center O of the sound outlet hole 112 and the center O1 of the first pressure relief hole 1131 and the distance between the center O of the sound outlet hole 112 and the center O2 of the second pressure relief hole 1132 in the Y direction may be 5mm-7mm, and the difference between the distance between the center O2 of the second pressure relief hole 1132 and the connection end CE and the distance between the center O of the sound outlet hole 112 and the connection end CE in the X direction may be 6mm-8mm.
- the distance from a certain position may refer to the distance from the position to the section of the connection end CE parallel to the minor axis.
- the long axis dimension of the sound-emitting portion 11 cannot be too long.
- the distance between the first pressure relief hole 1131 and the second pressure relief hole 1132 and the rear side surface RS of the sound-emitting portion 11 cannot be too short, otherwise the entire or partial area of the first pressure relief hole 1131 and/or the second pressure relief hole 1132 may be blocked in the X direction due to the contact between the free end FE and the wall surface of the concha cavity, so that the effective area of the first pressure relief hole 1131 and/or the second pressure relief hole 1132 is reduced.
- the distance a 3 from the center O 1 of the first pressure relief hole 1131 to the rear side surface RS ranges from 8.60 mm to 15.68 mm. In some embodiments, the distance a 3 from the center O 1 of the first pressure relief hole 1131 to the rear side surface RS ranges from 10.44 mm to 15.68 mm. In some embodiments, the distance a3 from the center O1 of the first pressure relief hole 1131 to the rear side surface RS ranges from 11.00 mm to 14.55 mm. In some embodiments, the distance a3 from the center O1 of the first pressure relief hole 1131 to the rear side surface RS ranges from 12.15 mm to 13.25 mm.
- the first pressure relief hole 1131 and/or the second pressure relief hole 1132 are The distance between the center O 1 of the hole 1131 and the inner side surface IS of the sound-emitting portion 11 along the Z direction cannot be too small. In some embodiments, the distance d 3 between the center O 1 of the first pressure relief hole 1131 and the inner side surface IS of the sound-emitting portion 11 along the Z direction ranges from 4.24 mm to 6.38 mm.
- the distance d 3 between the center O 1 of the first pressure relief hole 1131 and the inner side surface IS of the sound-emitting portion 11 along the Z direction ranges from 4.50 mm to 5.85 mm. In some embodiments, the distance d 3 between the center O 1 of the first pressure relief hole 1131 and the inner side surface IS of the sound-emitting portion 11 along the Z direction ranges from 4.80 mm to 5.50 mm. In some embodiments, the distance d 3 between the center O 1 of the first pressure relief hole 1131 and the inner side surface IS of the sound-emitting portion 11 along the Z direction ranges from 5.20 mm to 5.55 mm.
- the second pressure relief hole 1132 can be arranged away from the rear side surface RS (or the free end FE).
- the distance between the center of the first pressure relief hole 1131 and the rear side surface RS can be less than the distance between the center of the second pressure relief hole 1132 and the rear side surface RS.
- the distance between the center of the first pressure relief hole 1131 and the rear side surface RS may also be greater than or equal to the distance between the center of the second pressure relief hole 1132 and the rear side surface RS.
- the distance a4 between the center O2 of the second pressure relief hole 1132 and the rear side surface RS ranges from 13.51 mm to 20.27 mm.
- the distance a4 between the center O2 of the second pressure relief hole 1132 and the rear side surface RS ranges from 15.00 mm to 19.55 mm.
- the distance a4 between the center O2 of the second pressure relief hole 1132 and the rear side surface RS ranges from 17.15 mm to 18.25 mm.
- the distances d4 of the center O1 of the first pressure relief hole 1131 and the center O2 of the second pressure relief hole 1132 from the inner side surface IS of the sound-emitting portion 11 along the Z direction may be the same.
- the distance d4 of the center O2 of the second pressure relief hole 1132 from the inner side surface IS of the sound-emitting portion 11 along the Z direction ranges from 4.24 mm to 6.38 mm.
- the distance d4 of the center O2 of the second pressure relief hole 1132 from the inner side surface IS of the sound-emitting portion 11 along the Z direction ranges from 4.50 mm to 5.85 mm.
- the distance d4 of the center O2 of the second pressure relief hole 1132 from the inner side surface IS of the sound-emitting portion 11 along the Z direction ranges from 4.80 mm to 5.50 mm. In some embodiments, the distance d4 of the center O2 of the second pressure relief hole 1132 from the inner side surface IS of the sound-emitting portion 11 along the Z direction ranges from 5.20 mm to 5.55 mm. In some embodiments, in order to make the sound outlet hole 112 closer to the ear canal to increase the listening efficiency, the sound outlet hole 112 needs to be closer to the lower side surface LS.
- the second pressure relief hole 1132 in order to prevent the sound emitted by the second pressure relief hole 1132 from canceling out the sound emitted by the sound outlet hole 112 at the ear canal (i.e., the listening position), resulting in a decrease in the listening volume, in the Z direction, the second pressure relief hole 1132 can be farther away from the inner side surface IS relative to the first pressure relief hole 1131, that is, the distance between the center O 2 of the second pressure relief hole 1132 and the inner side surface IS can be different from the distance between the center O 1 of the first pressure relief hole 1131 and the inner side surface IS.
- the distance between the center O 1 of the first pressure relief hole 1131 and the inner side surface IS is 2.24 mm to 5.57 mm
- the distance between the center O 2 of the second pressure relief hole 1132 and the inner side surface IS is 5.57 mm to 6.36 mm.
- the shapes of the first pressure relief hole 1131 and the second pressure relief hole 1132 will also affect their sound quality.
- the acoustic resistance of the first pressure relief hole 1131 and the second pressure relief hole 1132 with a narrow shape is large, thereby reducing the sound intensity of the back cavity. Therefore, in order to ensure the sound intensity output by the first pressure relief hole 1131 and the second pressure relief hole 1132, the ratio of the major axis size to the minor axis size of the first pressure relief hole 1131 and the second pressure relief hole 1132 (also called the aspect ratio of the pressure relief hole 113) cannot be too large.
- the maximum size of the first pressure relief hole 1131 and the second pressure relief hole 1132 in the thickness direction Z cannot be too large. Therefore, when the area of the pressure relief hole 113 is constant, the ratio of the major axis size to the minor axis size of the first pressure relief hole 1131 and the second pressure relief hole 1132 cannot be too small.
- the shapes of the first pressure relief hole 1131 and the second pressure relief hole 1132 may include but are not limited to circular, elliptical, runway-shaped, etc. For the convenience of description, the following will take the case where the first pressure relief hole 1131 and the second pressure relief hole 1132 are arranged in a runway shape as an example for exemplary description.
- FIG16 is a schematic diagram of the structure of the shell of the open earphone according to some embodiments of the present application.
- the first pressure relief hole 1131 and the second pressure relief hole 1132 can be in a runway shape, wherein the two ends of the runway shape can be inferior arcs or semicircles.
- the maximum size of the first pressure relief hole 1131 and the second pressure relief hole 1132 in the thickness direction Z is defined as the corresponding short axis size, the short axis size of the first pressure relief hole 1131 is W 1 , and the short axis size of the second pressure relief hole 1132 is W 2 ;
- the maximum size of the first pressure relief hole 1131 and the second pressure relief hole 1132 in the long axis direction X is defined as the corresponding long axis size, the long axis size of the first pressure relief hole 1131 is L 1 , and the long axis size of the second pressure relief hole 1132 is L 2 .
- the ratio of the major axis size to the minor axis size of the first pressure relief hole 1131 and the second pressure relief hole 1132 cannot be too large or too small.
- the ratio of the major axis size L1 of the first pressure relief hole 1131 to the minor axis size W1 of the first pressure relief hole 1131 can be in the range of 1 to 8.
- the ratio of the major axis size L1 of the first pressure relief hole 1131 to the minor axis size W1 of the first pressure relief hole 1131 can be in the range of 1.33 to 8.
- the ratio of the major axis size L1 of the first pressure relief hole 1131 to the minor axis size W1 of the first pressure relief hole 1131 can be in the range of 3 to 7. In some embodiments, the ratio of the major axis size L1 of the first pressure relief hole 1131 to the minor axis size W1 of the first pressure relief hole 1131 can be in the range of 1.33 to 8. 4 to 6. In some embodiments, the ratio of the major axis dimension L 2 of the second pressure relief hole 1132 to the minor axis dimension W 2 of the second pressure relief hole 1132 may range from 1 to 8.
- the ratio of the major axis dimension L 2 of the second pressure relief hole 1132 to the minor axis dimension W 2 of the second pressure relief hole 1132 may range from 3 to 7. In some embodiments, the ratio of the major axis dimension L 2 of the second pressure relief hole 1132 to the minor axis dimension W 2 of the second pressure relief hole 1132 may range from 4 to 6. In some embodiments, the ratio of the major axis dimension L 2 of the second pressure relief hole 1132 to the minor axis dimension W 2 of the second pressure relief hole 1132 may also range from 1 to 6.
- the value range of the major axis size L1 of the first pressure relief hole 1131 can be 1.43mm-16.38mm
- the value range of the minor axis size W1 can be 1.43mm-5.7mm
- the value range of the major axis size L1 of the first pressure relief hole 1131 can be 4.10mm-16.38mm
- the value range of the minor axis size W1 can be 1.43mm-5.7mm.
- the value range of the major axis size L1 of the first pressure relief hole 1131 can be 6.14mm-10.92mm, and the value range of the minor axis size W1 can be 2.14mm-3.80mm.
- the value range of the major axis dimension L2 of the second pressure relief hole 1132 may be 1.00 mm-10.38 mm, and the value range of the minor axis dimension W2 may be 1.00 mm-4.05 mm.
- the value range of the major axis dimension L2 of the second pressure relief hole 1132 may be 2.59 mm-10.38 mm, and the value range of the minor axis dimension W2 may be 1.52 mm-4.05 mm.
- the value range of the major axis dimension L2 of the second pressure relief hole 1132 may be 3.89 mm-6.92 mm, and the value range of the minor axis dimension W2 may be 2.28 mm-4.05 mm.
- the first pressure relief hole 1131 and the second pressure relief hole 1132 can both adopt a trumpet-shaped structure.
- the area of the inner opening is smaller than the area of the corresponding outer opening, or the area of the outer opening is smaller than the area of the corresponding inner opening.
- the value range of the major axis dimension of the outer opening of the first pressure relief hole 1131 along the X direction may be 4.10 mm-16.38 mm
- the value range of the minor axis dimension of the outer opening of the first pressure relief hole 1131 along the Z direction may be 1.43 mm-5.7 mm
- the value range of the outer opening area of the first pressure relief hole 1131 is 5.39 mm 2 -86.21 mm 2
- the value range of the major axis dimension of the inner opening of the first pressure relief hole 1131 along the X direction may be 3.92 mm-15.68 mm
- the value range of the minor axis dimension of the inner opening of the first pressure relief hole 1131 along the Z direction may be 1.29 mm-5.14 mm
- the value range of the inner opening area of the first pressure relief hole 1131 is 4.58 mm 2 -73.32 mm 2
- the value range of the major axis dimension of the outer opening of the first pressure relief hole 1131 along the X direction may be 4.10 mm
- the value range of the major axis dimension of the outer opening of the first pressure relief hole 1131 along the X direction may be 6.14 mm-10.92 mm
- the value range of the minor axis dimension of the outer opening of the first pressure relief hole 1131 along the Z direction may be 2.14 mm-3.80 mm
- the value range of the outer opening area of the first pressure relief hole 1131 is 12.12 mm 2 -38.32 mm 2
- the value range of the major axis dimension of the inner opening of the first pressure relief hole 1131 along the X direction may be 5.88 mm-10.45 mm
- the value range of the minor axis dimension of the inner opening of the first pressure relief hole 1131 along the Z direction may be 1.93 mm-3.43 mm
- the value range of the inner opening area of the first pressure relief hole 1131 is 10.31 mm 2 -32.59 mm 2
- the value range of the major axis dimension of the outer opening of the first pressure relief hole 1131 along the X direction may be 6.14
- the value of the long axis dimension of the outer opening of the first pressure relief hole 1131 along the X direction may be 8.19 mm
- the value of the short axis dimension of the outer opening of the first pressure relief hole 1131 along the Z direction may be 2.85 mm
- the value of the outer opening area of the first pressure relief hole 1131 is 21.55 mm 2
- the value of the long axis dimension of the inner opening of the first pressure relief hole 1131 along the X direction may be 7.84 mm
- the value of the short axis dimension of the inner opening of the first pressure relief hole 1131 along the Z direction may be 2.57 mm
- the value of the inner opening area of the first pressure relief hole 1131 is 18.33 mm 2
- the value of the major axis dimension of the outer opening of the second pressure relief hole 1132 along the X direction may be 5.19 mm
- the ratio of the area of the opening in the first pressure relief hole 1131 to the area of the sound outlet hole 112 may be 0.1-15. In some embodiments, the ratio of the area of the opening in the second pressure relief hole 1132 to the area of the sound outlet hole 112 may be 0.1-3. In some embodiments, the ratio of the area of the opening in the first pressure relief hole 1131 to the area of the sound outlet hole 112 may be 0.2-10. In some embodiments, the ratio of the area of the opening in the second pressure relief hole 1132 to the area of the sound outlet hole 112 may be 0.1-3. The ratio of the area of the opening to the sound outlet hole 112 may be 0.1-2.
- the ratio of the area of the opening in the first pressure relief hole 1131 to the sound outlet hole 112 may be 0.3-5. In some embodiments, the ratio of the area of the opening in the second pressure relief hole 1132 to the sound outlet hole 112 may be 0.2-1.
- first pressure relief hole 1131 and the second pressure relief hole 1132 are used as acoustic holes to form a Helmholtz resonance cavity model with the rear cavity 116
- formula (2) described later it can be seen from formula (2) described later that the larger the area of the first pressure relief hole 1131 and the second pressure relief hole 1132, the larger the resonance frequency of the rear cavity 116, so that the corresponding resonance frequency of the leakage sound is shifted to a higher frequency band (for example, a frequency range greater than 4 kHz) as much as possible, which is beneficial to improving the flat area in the frequency response curve and further preventing the leakage sound from being heard.
- Fig. 17 is a frequency response curve diagram of an open-type earphone corresponding to first pressure relief holes of different areas according to some embodiments of the present application.
- Fig. 18 is a frequency response curve diagram of an open-type earphone corresponding to second pressure relief holes of different areas according to some embodiments of the present application.
- curve 171, curve 172, curve 173, curve 174, and curve 175 respectively represent the frequency response curves corresponding to the first pressure relief hole 1131 with an area of 0, 2.52 mm2 , 5.52 mm2 , 8.52 mm2 , and 11.52 mm2 .
- curve 181, curve 182, curve 183, curve 184, and curve 185 respectively represent the frequency response curves corresponding to the second pressure relief hole 1132 with an area of 0, 4.02 mm2 , 5.52 mm2 , 7.02 mm2 , and 8.52 mm2.
- the frequency response curve in FIG18 is a frequency response curve obtained by simulation at 15 mm directly in front of the sound outlet center O when the position and size of the first pressure relief hole 1131 remain unchanged.
- the frequency response curve of the open earphone in order to make the frequency response curve of the open earphone have a wider flat area (for example, the area before the resonance peak), and obtain a better sound leakage reduction effect in the mid-high frequency range (for example, 2kHz-6kHz), and ensure that the sound generated by the rear cavity has sufficient intensity in the far field while destroying the high pressure area of the sound field in the rear cavity, the area of the first pressure relief hole 1131 and/or the area of the second pressure relief hole 1132 cannot be too small.
- the area of the first pressure relief hole 1131 and/or the area of the second pressure relief hole 1132 is too large, it will have a certain impact on the appearance, structural strength, waterproof and dustproof of the open earphone 10.
- the area of the first pressure relief hole 1131 and/or the area of the second pressure relief hole 1132 cannot be too large.
- the area of the first pressure relief hole 1131 ranges from 3.78mm2 to 86.21mm2
- the area of the second pressure relief hole 1132 ranges from 2.78mm2 to 54.68mm2 .
- the area of the first pressure relief hole 1131 ranges from 3.78 mm 2 to 22.07 mm 2
- the area of the second pressure relief hole 1132 ranges from 2.78 mm 2 to 16.07 mm 2
- the area of the first pressure relief hole 1131 ranges from 6.78 mm 2 to 20.07 mm 2
- the area of the second pressure relief hole 1132 ranges from 4.78 mm 2 to 13.07 mm 2 .
- the pressure relief holes 113 (including the first pressure relief hole 1131 and the second pressure relief hole 1132) provided on the shell 111 and the back cavity can be regarded as a Helmholtz resonance cavity model
- the opening size of the first pressure relief hole 1131 and the second pressure relief hole 1132 will affect the resonance frequency of the back cavity.
- the resonance frequency of the back cavity is at a higher frequency, for example, the resonance frequency of the back cavity is within the frequency range of 2000Hz-6000Hz, this can be achieved by designing the ratio range of the opening size of the first pressure relief hole 1131 and the second pressure relief hole 1132 to the volume of the back cavity.
- the size of the sound-emitting part 11 along the Y direction can be determined based on the size of the concha cavity.
- the volume of the back cavity can be related to the area of the upper side surface US and/or the lower side surface LS of the sound-emitting portion 11.
- the ratio of the area of the pressure relief hole 113 to the volume of the back cavity cannot be too small.
- the ratio of the area of the pressure relief hole 113 to the area of the upper side surface US and/or the lower side surface LS cannot be too small.
- the ratio of the area of the pressure relief hole 113 to the area of the upper side surface US and/or the lower side surface LS cannot be too large.
- the ratio of the area of the first pressure relief hole 1131 to the area of the upper side surface US is between 0.036-0.093, and the ratio of the area of the second pressure relief hole 1132 to the area of the lower side surface LS is between 0.018-0.051. In some embodiments, the ratio of the area of the first pressure relief hole 1131 to the area of the upper side US is between 0.046-0.083, and the ratio of the area of the second pressure relief hole 1132 to the area of the lower side LS is between 0.028-0.041.
- the ratio of the area of the first pressure relief hole 1131 to the area of the upper side US is between 0.056-0.073, and the ratio of the area of the second pressure relief hole 1132 to the area of the lower side LS is between 0.031-0.038. In some embodiments, the ratio of the area of the first pressure relief hole 1131 to the area of the upper side US is between 0.056-0.073, and the ratio of the area of the second pressure relief hole 1132 to the area of the lower side LS is between 0.031-0.038. The ratio of the area of the second pressure relief hole 1132 to the area of the lower side surface LS is between 0.033 and 0.036.
- FIG19 is a schematic diagram of a projection on the sagittal plane of an open-type earphone in a worn state according to some embodiments of the present application.
- the free end FE in combination with FIG. 14 and FIG. 19, in order to stably wear the sound-emitting part 11 on the user's ear and to facilitate the construction of the cavity structure shown in FIG. 10, and to make the cavity structure have at least two leakage structures, the free end FE can abut against the concha cavity in the long axis direction X and the short axis direction Y.
- the medial side IS of the sound-emitting part 11 is inclined relative to the sagittal plane, and at this time, there is at least a first leakage structure UC close to the top of the head (i.e., the gap formed between the concha cavity and the upper boundary of the medial side IS) and a second leakage structure LC close to the ear canal (i.e., the gap formed between the concha cavity and the lower boundary of the medial side IS) between the medial side IS of the sound-emitting part and the concha cavity.
- the listening volume especially the listening volume of the mid-low frequency, can be increased, while still retaining the effect of far-field leakage cancellation, thereby improving the acoustic output performance of the open earphone 10.
- the first leakage structure UC and the second leakage structure LC formed between the inner side surface IS of the sound-emitting part and the concha cavity have certain dimensions in the long axis direction X and the thickness direction Z.
- the midpoint of the two points formed by the intersection of the upper/lower boundaries of the inner side surface IS and the ear e.g., the side wall of the concha cavity, the crus of the helix
- the center of the ear canal opening of the ear canal can be used as the position reference point of the ear canal.
- the midpoint of the upper boundary of the inner side surface IS can be used as the position reference point of the first leakage structure UC, and the point where the lower boundary of the inner side surface IS is divided into three equal parts near the free end FE (hereinafter referred to as the 1/3 point of the lower boundary of the inner side surface IS) can be used as the position reference point of the second leakage structure LC.
- the boundary between the medial surface IS and the upper surface US and/or the lower surface LS is an arc
- the upper boundary of the medial surface IS may refer to the intersection line between the medial surface IS and the upper surface US
- the lower boundary of the medial surface IS may refer to the intersection line between the medial surface IS and the lower surface LS.
- the intersection line of the two side surfaces may refer to the intersection line between the tangent planes of the two side surfaces that are farthest from the center of the sound-emitting portion and parallel to the long axis or short axis of the sound-emitting portion.
- this specification will use the midpoint of the upper boundary of the inner side surface IS and the 1/3 point of the lower boundary as the position reference points of the first leakage structure UC and the second leakage structure LC, respectively. It should be noted that the midpoint of the upper boundary of the inner side surface IS and the 1/3 point of the lower boundary are selected only as exemplary reference points to describe the positions of the first leakage structure UC and the second leakage structure LC. In some embodiments, other reference points can also be selected to describe the positions of the first leakage structure UC and the second leakage structure LC.
- the first leakage structure UC/second leakage structure LC formed when the open earphone 10 is in a wearing state is a gap with a gradually changing width.
- the reference position of the first leakage structure UC/second leakage structure LC can be the position of the upper boundary/lower boundary of the inner side surface IS close to the area with the largest gap width.
- the 1/3 point of the upper boundary of the inner side surface IS close to the free end FE can be used as the position of the first leakage structure UC
- the midpoint of the lower boundary of the inner side surface IS can be used as the position of the second leakage structure LC.
- the projection of the upper boundary of the medial surface IS in the sagittal plane may coincide with the projection of the upper surface US in the sagittal plane, and the projection of the lower boundary of the medial surface IS in the sagittal plane may coincide with the projection of the lower surface LS in the sagittal plane.
- the position reference point of the first leakage structure UC is located at (i.e., the midpoint of the upper boundary of the medial surface IS) and the projection in the sagittal plane is point A
- the position reference point of the second leakage structure LC is located at (i.e., the 1/3 point of the lower boundary of the medial surface IS) and the projection in the sagittal plane is point C
- the projection point A of the midpoint of the upper boundary of the medial surface IS in the sagittal plane may be the intersection point of the upper boundary of the medial surface IS and the short axis center plane of the magnetic circuit component of the transducer (e.g., the magnetic circuit component 1144 described below) and the projection point on the sagittal plane.
- the short axis center plane of the magnetic circuit component refers to a plane parallel to the short axis direction of the sound-emitting part 11 and passing through the geometric center of the magnetic circuit component.
- the projection point C of the 1/3 point of the lower border of the medial surface IS on the sagittal plane may be the projection point of the trisection point of the lower border of the medial surface IS close to the free end FE on the sagittal plane.
- the projection of the sound-emitting portion 11 of the open earphone 10 on the sagittal plane can at least partially cover the ear canal of the user, but the ear canal can be connected to the outside world through the cavum concha to free the user's ears.
- the sound of the pressure relief hole 113 can be transmitted into the cavity structure through the leakage structure (for example, the first leakage structure UC or the second leakage structure LC) and cancel out the sound of the sound outlet hole 112, the first pressure relief hole 1131 and the second pressure relief hole 1132 cannot be too close to the leakage structures on the upper and lower sides.
- the projection point O 1 ' of the center O 1 of the first pressure relief hole 1131 in the sagittal plane may substantially coincide with the projection point A of the midpoint of the upper boundary of the medial side surface IS in the sagittal plane.
- the distance range between the projection point O 1 ' of the center O 1 of the first pressure relief hole 1131 in the sagittal plane and the projection point A of the midpoint of the upper boundary of the medial side surface IS in the sagittal plane is not greater than 2 mm.
- the distance range between the projection point O 1 ' of the center O 1 of the first pressure relief hole 1131 in the sagittal plane and the projection point A of the midpoint of the upper boundary of the medial side surface IS in the sagittal plane is not greater than 1 mm. In some embodiments, the distance range between the projection point O 1 ' of the center O 1 of the first pressure relief hole 1131 in the sagittal plane and the projection point A of the midpoint of the upper boundary of the medial side surface IS in the sagittal plane is not greater than 0.5 mm.
- the relative position of the sound outlet 112 and the first pressure relief hole 1131 remains unchanged (that is, the distance between the center O of the sound outlet 112 and the center O1 of the first pressure relief hole 1131 remains unchanged)
- the larger the volume V of the cavity structure the smaller the overall (full frequency range) listening index of the open earphone 10. This is because, affected by the air-acoustic resonance in the cavity structure, at the resonant frequency of the cavity structure, air-acoustic resonance will be generated in the cavity structure and radiate outwardly a sound much greater than that of the pressure relief hole 113, resulting in a significant increase in sound leakage, thereby significantly reducing the listening index near the resonant frequency.
- the distance between the projection point A of the midpoint of the upper boundary of the medial surface IS on the sagittal plane and the projection point O 3 ' of the center of the ear canal opening on the sagittal plane is 12 mm to 18 mm
- the distance between the projection point O 2 ' of the center of the second pressure relief hole on the sagittal plane and the projection point O 3 ' of the center of the ear canal opening on the sagittal plane is 6.88 mm to 10.32 mm.
- the distance between the projection point A of the midpoint of the upper boundary of the medial surface IS on the sagittal plane and the projection point O 3 ' of the center of the ear canal opening on the sagittal plane is 14 mm to 16 mm
- the distance between the projection point O 2 ' of the center of the second pressure relief hole on the sagittal plane and the projection point O 3 ' of the center of the ear canal opening on the sagittal plane is 7.88 mm to 9.32 mm.
- the distance between the projection point A of the midpoint of the upper boundary of the inner side surface IS in the sagittal plane and the projection point O 3 ' of the center of the ear canal opening in the sagittal plane is in the range of 14.5 mm to 15.5 mm
- the distance between the projection point O 2 ' of the center O 2 of the second pressure relief hole in the sagittal plane and the projection point O 3 ' of the center O 3 of the ear canal opening in the sagittal plane is in the range of 7.88 mm to 8.32 mm.
- the distance between the projection point O 1 ' of the center O 1 of the first pressure relief hole 1131 in the sagittal plane and the projection point O 3 ' of the center O 3 of the ear canal opening in the sagittal plane is 12 mm to 18 mm. In some embodiments, the distance between the projection point O 1 ' of the center O 1 of the first pressure relief hole 1131 in the sagittal plane and the projection point O 3 ' of the center O 3 of the ear canal opening in the sagittal plane is 14 mm to 16 mm.
- the distance between the projection point O 1 ' of the center O 1 of the first pressure relief hole 1131 in the sagittal plane and the projection point O 3 ' of the center O 3 of the ear canal opening in the sagittal plane is 14.5 mm to 15.5 mm.
- the distance between the projection point O 1 ' of the center O 1 of the first pressure relief hole 1131 on the sagittal plane and the projection point B of the 1/3 point of the lower boundary of the medial side surface IS on the sagittal plane ranges from 13.76 mm to 20.64 mm.
- the distance between the projection point O 1 ' of the center O 1 of the first pressure relief hole 1131 on the sagittal plane and the projection point B of the 1/3 point of the lower boundary of the medial side surface IS on the sagittal plane ranges from 15.76 mm to 18.64 mm. In some embodiments, the distance between the projection point O 1 ′ of the center O 1 of the first pressure relief hole 1131 on the sagittal plane and the projection point B of the 1/3 point of the lower boundary of the medial side surface IS on the sagittal plane is in the range of 16.16 mm to 18.24 mm.
- the distance between the projection point O 2 ' of the center O 2 of the second pressure relief hole 1132 in the sagittal plane and the projection point B of the 1/3 point of the lower boundary of the medial side surface IS in the sagittal plane ranges from 8.16 mm to 12.24 mm. In some embodiments, the distance between the projection point O 2 ' of the center O 2 of the second pressure relief hole 1132 in the sagittal plane and the projection point B of the 1/3 point of the lower boundary of the medial side surface IS in the sagittal plane ranges from 9.16 mm to 11.24 mm.
- the distance between the projection point O 2 ' of the center O 2 of the second pressure relief hole 1132 in the sagittal plane and the projection point B of the 1/3 point of the lower boundary of the medial side surface IS in the sagittal plane ranges from 9.66 mm to 10.74 mm.
- the distance between the projection B of the 1/3 point of the lower boundary of the medial surface on the sagittal plane and the projection point O 3 ' of the center O 3 of the ear canal opening on the sagittal plane ranges from 1.76 mm to 2.64 mm. In some embodiments, the distance between the projection point B of the 1/3 point of the lower boundary of the medial surface on the sagittal plane and the projection point O 3 ' of the center O 3 of the ear canal opening on the sagittal plane ranges from 1.96 mm to 2.44 mm.
- the distance between the projection point B of the 1/3 point of the lower boundary of the medial surface on the sagittal plane and the projection point O 3 ' of the center O 3 of the ear canal opening on the sagittal plane ranges from 2.16 mm to 2.24 mm.
- FIG. 20A is a diagram showing an exemplary internal structure of a sound-emitting part according to some embodiments of the present application.
- the sound-emitting part 11 may include a housing 111 connected to the ear hook 12 and a transducer 116 disposed in the housing 111.
- the sound-emitting part 11 may also include a main control circuit board 13 disposed in the housing 111 and a battery (not shown) disposed at one end of the ear hook 12 away from the sound-emitting part 11, and the battery and the transducer 116 are respectively electrically connected to the main control circuit board 13 to allow The battery can supply power to the transducer 116 under the control of the main control circuit board 13.
- the battery and the transducer 116 can also be arranged in the sound-emitting part 11, and the battery can be closer to the connection end CE and the transducer 116 can be closer to the free end FE.
- the open earphone 10 may include an adjustment mechanism connecting the sound-emitting portion 11 and the ear hook 12.
- Different users can adjust the relative position of the sound-emitting portion 11 on the ear through the adjustment mechanism when wearing the earphone, so that the sound-emitting portion 11 is located at a suitable position, so that the sound-emitting portion 11 and the concha cavity form a cavity structure.
- the adjustment mechanism due to the existence of the adjustment mechanism, the user can also adjust the earphone 10 to a more stable and comfortable position.
- the concha cavity has a certain volume and depth, after the free end FE extends into the concha cavity, there can be a certain distance between the inner side IS of the sound-emitting part 11 and the concha cavity.
- the sound-emitting part 11 can cooperate with the concha cavity to form a cavity structure connected to the external auditory canal in the worn state, and a sound outlet hole 112 is provided on the sound-emitting part 11 (for example, the inner side IS), and the sound outlet hole 112 can be at least partially located in the aforementioned cavity structure.
- the sound waves propagated from the sound outlet hole 112 will be restricted by the aforementioned cavity structure, that is, the aforementioned cavity structure can gather the sound waves so that the sound waves can be better propagated into the external auditory canal, thereby improving the volume and sound quality of the sound heard by the user in the near field, which is conducive to improving the acoustic effect of the earphone 10. Furthermore, since the sound-emitting part 11 can be arranged not to block the external auditory canal in the worn state, the aforementioned cavity structure can be arranged in a semi-open state.
- a part of the sound waves propagated from the sound outlet 112 can be propagated to the ear canal so that the user can hear the sound, and the other part can be propagated together with the sound reflected from the ear canal through the gap between the sound-emitting part 11 and the ear (for example, the part of the concha cavity not covered by the sound-emitting part 11) to the outside of the earphone 10 and the ear, thereby forming a first sound leakage in the far field;
- the sound waves propagated through the pressure relief holes 113 for example, the first pressure relief hole 1131 and the second pressure relief hole 1132 opened on the sound-emitting part 11 generally form a second sound leakage in the far field, and the intensity of the aforementioned first sound leakage is equivalent to the intensity of the aforementioned second sound leakage, and the phase of the aforementioned first sound leakage and the phase of the aforementioned second sound leakage are (close to) opposite to each other, so that the two can cancel each other out in
- a front cavity 114 may be formed between the transducer 116 and the housing 111 , and a sound outlet hole 112 is disposed on the housing 111 to surround an area forming the front cavity 114 .
- the front cavity 114 is connected to the outside through the sound outlet hole 112 .
- the front cavity 114 is disposed between the diaphragm of the transducer 116 and the housing 111. In order to ensure that the diaphragm has sufficient vibration space, the front cavity 114 may have a larger depth dimension (i.e., the distance dimension between the diaphragm of the transducer 116 and the housing 111 facing it).
- the sound outlet 112 is disposed on the inner side surface IS in the thickness direction Z. At this time, the depth of the front cavity 114 may refer to the dimension of the front cavity 114 in the Z direction.
- the depth of the front cavity 114 may be 0.55 mm-1.00 mm. In some embodiments, the depth of the front cavity 114 may be 0.66 mm-0.99 mm. In some embodiments, the depth of the front cavity 114 may be 0.76 mm-0.99 mm. In some embodiments, the depth of the front cavity 114 may be 0.96 mm-0.99 mm. In some embodiments, the depth of the front cavity 114 may be 0.97 mm.
- the resonant frequency of the Helmholtz resonance cavity structure formed by the front cavity 114 and the sound outlet 112 should be as high as possible, so that the overall frequency response curve of the sound-emitting part has a wider flat area.
- the resonant frequency f1 of the front cavity 114 may be no less than 3kHz. In some embodiments, the resonant frequency f1 of the front cavity 114 may be no less than 4kHz. In some embodiments, the resonant frequency of the front cavity 114 may be no less than 6kHz. In some embodiments, the resonant frequency of the front cavity 114 may be no less than 7kHz. In some embodiments, the resonant frequency of the front cavity 114 may be no less than 8kHz.
- an acoustic resistance net 118 may be provided at the position corresponding to the first pressure relief hole 1131 and/or the second pressure relief hole 1132.
- the acoustic resistance net 118 can adjust the amplitude at the resonant frequency of the back cavity, and can also play a role in dust and water resistance.
- the other parameters of the acoustic resistance net 118 are constant, the size of its acoustic resistance is related to its thickness, and acoustic resistance nets of different thicknesses will have a certain impact on the acoustic output performance of the corresponding acoustic hole. Therefore, the thickness of the acoustic resistance net 118 is limited to a certain range.
- the thickness range of the acoustic resistance net 118 provided at the first pressure relief hole 1131 and the second pressure relief hole 1132 may be 35 ⁇ m-300 ⁇ m. In some embodiments, the thickness range of the acoustic resistance net 118 provided at the first pressure relief hole 1131 and the second pressure relief hole 1132 may be 40 ⁇ m-150 ⁇ m. In some embodiments, the thickness range of the acoustic resistance net 118 provided at the first pressure relief hole 1131 and the second pressure relief hole 1132 may be 50 ⁇ m-65 ⁇ m. In some embodiments, the thickness of the acoustic resistance net 118 disposed at the first pressure relief hole 1131 and the second pressure relief hole 1132 may range from 55 ⁇ m to 62 ⁇ m.
- the distance between the upper surface of the acoustic resistance net 118 disposed at the first pressure relief hole 1131 and the outer surface of the shell 1111 may be 0.8 mm-0.9 mm, and the distance between the upper surface of the acoustic resistance net 118 disposed at the second pressure relief hole 1132 and the outer surface of the shell 1111 may be 0.7 mm-0.8 mm.
- the distance between the upper surface of the acoustic resistance net 118 disposed at the first pressure relief hole 1131 and the outer surface of the shell 1111 can be 0.82mm-0.88mm, and the distance between the upper surface of the acoustic resistance net 118 disposed at the second pressure relief hole 1132 and the outer surface of the shell 1111 can be 0.72mm-0.76mm. In some embodiments, the distance between the upper surface of the acoustic resistance net 118 disposed at the first pressure relief hole 1131 and the outer surface of the shell 1111 can be 0.86mm, and the distance between the upper surface of the acoustic resistance net 118 disposed at the second pressure relief hole 1132 and the outer surface of the shell 1111 can be 0.73mm.
- FIG. 20B is an exemplary structural diagram of a second acoustic cavity according to some embodiments of the present specification.
- a bracket 117 may be provided in the housing 111, and a cavity 115 may be formed between the bracket 117 and the transducer 116, so that the cavity 115 is separated from other structures in the housing 111 (such as the main control circuit board 13, etc.), which is conducive to improving the acoustic performance of the sound-emitting part 11.
- the rear cavity described elsewhere in this specification may include not only the cavity 115, but also other areas located on the rear side of the diaphragm and connected to the cavity 115 (for example, the space between the diaphragm and the magnetic circuit assembly).
- the housing 111 is provided with a pressure relief hole 113 (for example, a first pressure relief hole 1131 and/or a second pressure relief hole 1132), and the bracket 117 is provided with an acoustic channel connecting the pressure relief hole 113 and the cavity 115, so that the cavity 115 is connected to the external environment, that is, air can freely enter and exit the rear cavity, which is conducive to reducing the resistance of the diaphragm of the transducer 116 during vibration.
- a pressure relief hole 113 for example, a first pressure relief hole 1131 and/or a second pressure relief hole 1132
- the frequency response curve of the rear cavity needs to have a wider flat area, so the resonant frequency of the rear cavity can be set larger.
- the resonant frequency of the rear cavity can be equal to the resonant frequency of the front cavity 114.
- the difference between the resonant frequency of the rear cavity and the resonant frequency of the front cavity 114 may be no more than 1kHz.
- the difference between the resonant frequency of the rear cavity and the resonant frequency of the front cavity 114 may be no more than 500Hz. In some embodiments, the difference between the resonant frequency of the rear cavity and the resonant frequency of the front cavity 114 may be no more than 200Hz. In some embodiments, the resonant frequency of the rear cavity may be no less than 4.5kHz. In some embodiments, the resonant frequency of the rear cavity may be no less than 6kHz. In some embodiments, the resonant frequency of the rear cavity may be 8kHz.
- the combination of the rear cavity and the pressure relief hole 113 provided on the shell 111 can be regarded as a Helmholtz resonance cavity model.
- the rear cavity can be used as the cavity of the Helmholtz resonance cavity model
- the pressure relief hole can be used as the neck of the Helmholtz resonance cavity model.
- the resonant frequency of the Helmholtz resonance cavity model is the resonant frequency of the rear cavity.
- the size of the neck for example, the first pressure relief hole 1131 or the second pressure relief hole 1132
- the specific relationship is shown in formula (2):
- c represents the speed of sound
- S represents the area of the neck (such as the first pressure relief hole 1131 or the second pressure relief hole 1132)
- V represents the volume of the cavity (such as the rear cavity)
- L represents the depth of the neck (such as the first pressure relief hole 1131 or the second pressure relief hole 1132).
- the volume of the rear cavity will also affect the acoustic capacitance Ca of the rear cavity. Changes in the acoustic capacitance Ca of the rear cavity will cause changes in the capacitive reactance characteristics of the rear cavity, thereby affecting the vibration characteristics of the rear cavity.
- the specific relationship between the volume of the rear cavity and the acoustic capacitance Ca of the rear cavity is shown in formula (3):
- ⁇ represents the air density
- c represents the speed of sound
- V represents the volume of the back cavity.
- the cross section of the cavity 115 may be composed of two vertical sides and a curved side, and the two end points of the curved side are connected, so that the cross section (for example, cross section C1C2C3) can be approximately regarded as a triangle.
- the hypotenuse C1C3 is composed of the line connecting the two end points formed by the curved surface formed on the bracket 115 and the two straight sides, and the two straight sides C1C2 and C2C3 are composed of the basin of the transducer 116, wherein the hypotenuse C1C3 and the straight side C2C3 have an angle ⁇ .
- the basin of the sound-emitting part 11 needs to be provided with an acoustic hole (for example, a sound-transmitting hole) in the area where the straight side C2C3 is located, so that the sound generated by the vibration of the diaphragm 1161 can be radiated to the cavity 115, a good channel for radiating sound is provided between the rear side of the diaphragm 1161 and the cavity 115.
- the length of the straight side C1C2 can be adjusted to adjust the size of the angle ⁇ , and then the area of the triangle C1C2C3 can be changed to adjust the volume of the cavity 115, thereby changing the volume of the back cavity.
- the length of the straight side C2C3 is not less than 0.67 mm. In some embodiments, the length of the straight side C2C3 can be 0.7 mm. In some embodiments, since the value of the angle ⁇ has a range limit, the value of the volume V of the cavity 115 also has a range limit.
- FIG20C is a frequency response curve of the rear cavity corresponding to different sizes of angles ⁇ shown in some embodiments of this specification.
- the length of the straight edge BC is reduced to reduce the angle ⁇ from 67.6° to 45°
- the volume V of the rear cavity is reduced, and the corresponding acoustic capacitance Ca of the rear cavity is reduced from 7 ⁇ 10-12m3/Pa to 2.88 ⁇ 10-12m3/Pa, but the resonant frequency of the rear cavity increases from about 4.5kHz to about 6kHz.
- the resonant frequency of the rear cavity increases from about 4.5kHz to about 6kHz.
- the corresponding acoustic capacitance Ca of the back cavity increases from 7 ⁇ 10-12m3/Pa to 15 ⁇ 10-12m3/Pa, but the resonant frequency of the back cavity decreases from about 4.5kHz to about 3kHz.
- the parameters such as 7 ⁇ 10-12m3/Pa and 15 ⁇ 10-12m3/Pa shown in FIG20C only represent the acoustic capacitance values corresponding to the volume of the back cavity in theory, and there may be errors with the actual data.
- the angle ⁇ in the cavity 115 may be in a range of 45°-79.11°. In some embodiments, the angle ⁇ in the cavity 115 may be in a range of 60°-70°. In some embodiments, the angle ⁇ in the cavity 115 may be in a range of 67.6°. In some embodiments, the angle ⁇ in the cavity 115 may be in a range of 67°-68°.
- FIG. 21 is a diagram showing an exemplary internal structure of a transducer according to some embodiments of the present application.
- the housing 111 contains a transducer 116, which includes a diaphragm 1161, a voice coil 1162, a basin 1163, and a magnetic circuit assembly 1164.
- the basin 1163 is arranged around the diaphragm 1161, the voice coil 1162, and the magnetic circuit assembly 1164 to provide a mounting and fixing platform.
- the transducer 116 can be connected to the housing 111 through the basin 1163.
- the diaphragm 1161 covers the voice coil 1162 and the magnetic circuit assembly 1164 in the Z direction.
- the voice coil 1162 extends into the magnetic circuit assembly 1164 and is connected to the diaphragm 1161.
- the magnetic field generated by the voice coil 1162 after being energized interacts with the magnetic field formed by the magnetic circuit assembly 1164, thereby driving the diaphragm 1161 to generate mechanical vibration, and then generating sound through the propagation of a medium such as air, and the sound is output through the sound outlet 112.
- the magnetic circuit assembly 1164 includes a magnetic conductive plate 11641, a magnet 11642, and a container 11643.
- the magnetic conductive plate 11641 and the magnet 11642 are connected to each other.
- the side of the magnet 11642 away from the magnetic conductive plate 11641 is installed on the bottom wall of the container 11643, and there is a gap between the peripheral side of the magnet 11642 and the peripheral inner side wall of the container 11643.
- the peripheral outer side wall of the container 11643 is connected and fixed to the basin frame 1163.
- the container 11643 and the magnetic conductive plate 11641 can both be made of magnetic conductive materials (such as iron, etc.).
- the circumference of the diaphragm 1161 may be connected to the basin frame 1163 via a fixing ring 1155.
- the fixing ring 1165 may be made of stainless steel or other metal materials to adapt to the processing and manufacturing process of the diaphragm 1161.
- the size of the transducer 116 will be too large, which will cause the housing 111 to be too large, which will easily cause the housing 111 to collide and rub with the auricle, affecting the wearing comfort of the sound-emitting part 11. Therefore, it is necessary to design the size of the housing 111.
- the short axis size (also referred to as the width size) of the housing 111 in the Y direction can be determined according to the size of the concha cavity in the Y direction (for example, 17 mm), and then a suitable length-to-short ratio (that is, the ratio of the size of the housing 111 in the X direction to the size in the Y direction) is selected according to the wearing comfort, so as to determine the long axis size (also referred to as the length size) of the housing 111 in the X direction (for example, 21.49 mm) to match the size of the concha cavity in the X direction.
- the size of the housing 111 can be a value within a preset range. In some embodiments, according to the width size range of the concha cavity along the Y direction, the width size of the housing 111 along the Y direction can be in the range of 11mm-16mm.
- the width size of the housing 111 along the Y direction can be 11mm-15mm. In some embodiments, the width size of the housing 111 along the Y direction can be 14mm-15mm. In some embodiments, the ratio of the size of the housing 111 in the X direction to the size in the Y direction can be 1.2-5. In some embodiments, the ratio of the size of the housing 111 in the X direction to the size in the Y direction can be 1.4-4. In some embodiments, the ratio of the size of the shell 111 in the X direction to the size in the Y direction may be 1.5-2. In some embodiments, the length of the shell 111 along the X direction may be in the range of 15mm-30mm.
- the length of the shell 111 along the X direction may be 16mm-28mm. In some embodiments, the length of the shell 111 along the X direction may be 19mm-24mm. In some embodiments, in order to avoid the excessive volume of the shell 111 affecting the wearing comfort of the open earphone 10, the thickness of the shell 111 along the Z direction may be in the range of 5mm-20mm. In some embodiments, the thickness of the shell 111 along the Z direction may be 5.1mm-18mm. In some embodiments, the thickness of the shell 111 along the Z direction may be 6mm-15mm. In some embodiments, the thickness of the shell 111 along the Z direction may be 7mm-10mm.
- the area of the inner side surface IS of the shell 111 (which is equal to the product of the length and width of the shell 111 when the inner side surface IS is rectangular) may be 90mm 2 -560mm 2 .
- the area of the inner side surface IS can be regarded as being approximately equal to the projection area of the diaphragm 1161 along the Z direction.
- the area of the inner side surface IS differs from the projection area of the diaphragm 1161 along the Z direction by 10%.
- the area of the inner side surface IS can be 150mm 2 -360mm 2 .
- the area of the inner side surface IS can be 160mm 2 -240mm 2 .
- the area of the inner side surface IS can be 180mm 2 -200mm 2 .
- the size design of the open-type earphone 10 is superior to the acoustic performance of the existing open-type earphones on the basis of meeting the wearing comfort. That is to say, on the premise of achieving the same excellent acoustic performance, the size of the open-type earphone 10 can be smaller than the existing open headphones.
- the volume V of the rear cavity needs to have an appropriate value range.
- the distance between the center O1 of the first pressure relief hole 1131 and the bottom surface of the magnetic circuit component 1164 can be reasonably designed. Referring to Figures 20A and 21, when the thickness of the sound-emitting part 11 in the Z direction is constant, the smaller the distance between the center O1 of the first pressure relief hole 1131 and the bottom surface of the magnetic circuit component 1164 along the Z direction, the larger the volume of the rear cavity may be.
- the acoustic capacitance Ca of the rear cavity increases, but the corresponding resonant frequency of the rear cavity decreases.
- the resonant frequency of the rear cavity is within a suitable frequency range (for example, 2000Hz-6000Hz), and the user is comfortable enough to wear, taking into account the structural strength, the difficulty of process implementation, and the overall thickness of the shell 111, the distance d5 from the center O1 of the first pressure relief hole 1131 to the bottom surface of the magnetic circuit assembly 1164 (that is, the side of the accommodating member 11643 away from the sound outlet hole 112 along the Z direction) is in the range of 1.31mm to 1.98mm.
- the distance d5 from the center O1 of the first pressure relief hole 1131 to the bottom surface of the magnetic circuit assembly 1164 along the Z direction is in the range of 1.31mm to 1.98mm. In some embodiments, the distance d5 from the center O1 of the first pressure relief hole 1131 to the bottom surface of the magnetic circuit assembly 1164 along the Z direction is in the range of 1.41mm to 1.88mm. In some embodiments, the distance d5 from the center O1 of the first pressure relief hole 1131 to the bottom surface of the magnetic circuit assembly 1164 along the Z direction is in the range of 1.51 mm to 1.78 mm.
- the distance d5 from the center O1 of the first pressure relief hole 1131 to the bottom surface of the magnetic circuit assembly 1164 along the Z direction is in the range of 1.56 mm to 1.72 mm.
- the distance d6 from the center O2 of the second pressure relief hole 1132 to the bottom surface of the magnetic circuit assembly 1164 along the Z direction is in the range of 1.31 mm to 1.98 mm.
- the distance d6 from the center O2 of the second pressure relief hole 1132 to the bottom surface of the magnetic circuit assembly 1164 along the Z direction is in the range of 1.41 mm to 1.88 mm.
- the distance d6 from the center O2 of the second pressure relief hole 1132 to the bottom surface of the magnetic circuit assembly 1164 along the Z direction is in the range of 1.51 mm to 1.78 mm. In some embodiments, a distance d 6 from the center O 2 of the second pressure relief hole 1132 to the bottom surface of the magnetic circuit assembly 1164 along the Z direction ranges from 1.56 mm to 1.72 mm.
- the size of the sound-emitting part 11 along the Y direction can be limited. In some embodiments, the size of the sound-emitting part 11 along the Y direction can be determined by the distance between the center O 1 of the first pressure relief hole 1131 and the center plane of the long axis of the magnetic circuit assembly 1164 (for example, the surface NN' perpendicular to the inner surface of the paper as shown in FIG. 21).
- the distance between the center O 1 of the first pressure relief hole 1131 and the center plane of the long axis of the magnetic circuit assembly 1164 can be limited. In some embodiments, the distance between the center O 1 of the first pressure relief hole 1131 and the center plane of the long axis of the magnetic circuit assembly 1164 ranges from 5.45 mm to 8.19 mm.
- the center plane of the long axis of the magnetic circuit assembly 1164 refers to a plane parallel to the lower side surface LS of the sound-emitting part 11 and passing through the center of mass of the magnetic circuit assembly 1164.
- the long axis center plane of the magnetic circuit assembly 1164 can divide the magnetic circuit assembly 1164 into two identical parts along the direction X.
- the distance between the center O 1 of the first pressure relief hole 1131 and the long axis center plane of the magnetic circuit assembly 1164 is also the distance from the center O 1 of the first pressure relief hole 1131 to the long axis center plane along the short axis direction Y.
- the distance range of the center O 1 of the first pressure relief hole 1131 from the long axis center plane of the magnetic circuit assembly 1164 is 5.95 mm to 8.69 mm.
- the distance range of the center O 1 of the first pressure relief hole 1131 from the long axis center plane of the magnetic circuit assembly 1164 is 6.45 mm to 7.19 mm. In some embodiments, the distance range of the center O 1 of the first pressure relief hole 1131 from the long axis center plane of the magnetic circuit assembly 1164 is 6.65 mm to 6.99 mm. Similarly, in some embodiments, the distance between the center O 2 of the second pressure relief hole 1132 and the center plane of the long axis of the magnetic circuit assembly 1164 ranges from 5.46 mm to 8.20 mm.
- the distance between the center O 2 of the second pressure relief hole 1132 and the center plane of the long axis of the magnetic circuit assembly 1164 ranges from 5.96 mm to 8.70 mm. In some embodiments, the distance between the center O 1 of the second pressure relief hole 1132 and the center plane of the long axis of the magnetic circuit assembly 1164 ranges from 6.46 mm to 7.20 mm. In some embodiments, the distance between the center O 1 of the second pressure relief hole 1132 and the center plane of the long axis of the magnetic circuit assembly 1164 ranges from 6.66 mm to 7.00 mm.
- the air pressure at the position close to the pressure relief hole 113 is close to the external air pressure, and the air pressure at the position far from the pressure relief hole 113 is higher than the external air pressure.
- the basin frame 1163 is provided with a sound-permeable hole (not shown) connecting the rear side of the diaphragm 1161 and the cavity 115, in order to balance the air pressure between the rear side of the diaphragm 1161 and the cavity 115, the sound-permeable holes on the basin frame can be arranged asymmetrically to better balance the airflow.
- the size of the sound-permeable hole can be larger; at a position close to the first pressure relief hole 1131 and/or the second pressure relief hole 1132, since the air pressure is relatively low, the size of the sound-permeable hole can be smaller.
- the low-frequency vibration of the open earphone 10 can be made smoother by adjusting the size (e.g., cross-sectional area) of the first pressure relief hole 1131, the second pressure relief hole 1132, and/or the sound-permeable hole.
- the first pressure relief hole 1131 and the second pressure relief hole 1132 can be staggered in the X direction. At this time, the projections of the first pressure relief hole 1131 and the second pressure relief hole 1132 on the center plane of the long axis partially overlap or do not overlap. In some embodiments, the overlapping area of the projections of the first pressure relief hole 1131 and the second pressure relief hole 1132 on the center plane of the long axis is not greater than 10.77 mm 2.
- the overlapping area of the projections of the first pressure relief hole 1131 and the second pressure relief hole 1132 on the center plane of the long axis is not greater than 6.77 mm 2. In some embodiments, the first pressure relief hole 1131 and the second pressure relief hole 1132 on the center plane of the long axis overlap. The overlapping area of the projections on the center plane of the long axis is no greater than 4.77 mm 2 . In some embodiments, the overlapping area of the projections of the first pressure relief hole 1131 and the second pressure relief hole 1132 on the center plane of the long axis is no greater than 2.77 mm 2 .
- FIG. 22 is a schematic diagram of the shell of the open-type earphone along the Z direction on the plane where the bottom surface of the magnetic circuit assembly is located.
- the projection point O 1 of the center of the first pressure relief hole 1131 along the Z direction on the plane where the bottom surface of the magnetic circuit assembly 1164 is located is O 1
- the projection point O 2 of the center of the second pressure relief hole 1132 along the Z direction on the plane where the bottom surface of the magnetic circuit assembly 1164 is located is O 2 ”.
- the length range of the connecting line O 1 ”O 2 ” can be made greater than the minor axis size of the sound-emitting part 11.
- the length range of the connecting line O 1 ”O 2 ” is 11mm-16mm.
- the length range of the connecting line O 1 ”O 2 ” is 8.51mm-15.81mm. In some embodiments, the length range of the connecting line O 1 ”O 2 ” is 10.51mm-15.81mm. In some embodiments, the length range of the connecting line O 1 ”O 2 ” is 11.51mm-14.81mm. In some embodiments, the length of the connecting line O 1 ′′O 2 ′′ ranges from 12.51 mm to 13.81 mm. In some embodiments, the ratio of the length of the connecting line O 1 ′′O 2 ′′ to the width of the sound-emitting portion 11 may be between 1 and 1.88.
- the first pressure relief hole 1131 and the second pressure relief hole 1132 cannot be staggered too much in the X direction. If the staggered degree is too large, it is easy for the first pressure relief hole 1131 and the second pressure relief hole 1132 to be close to the free end FE or the connection end CE in the X direction, so that the first pressure relief hole 1131 and/or the second pressure relief hole 1132 are blocked by the ear structure (for example, the side wall of the concha cavity, the tragus, etc.) when the open earphone 10 is worn.
- the ear structure for example, the side wall of the concha cavity, the tragus, etc.
- the staggered degree of a pressure relief hole 1131 and the second pressure relief hole 1132 in the X direction can be related to the angle ⁇ between the connecting line O 1 ′′O 2 ′′ and the short axis direction Y.
- the angle ⁇ can range from 12.85° to 23.88°.
- the angle ⁇ can range from 14.85° to 21.88°.
- the angle ⁇ can range from 16.85° to 19.88°.
- the angle ⁇ can range from 18.85° to 29.88°.
- the description of the above-mentioned open earphone 10 is for illustrative purposes only and is not intended to limit the scope of the present application.
- the pressure relief hole can be any one of the first pressure relief hole 1131 and the second pressure relief hole 1132.
- the pressure relief hole can be the first pressure relief hole 1131, that is, the pressure relief hole can be provided on the upper side US.
- the distance range of the center of the pressure relief hole from the inner side IS can be 4.24mm to 6.38mm, and the distance range of the center of the pressure relief hole from the rear side RS can be 10.44mm to 15.68mm.
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Abstract
Description
Claims (35)
- 一种开放式耳机,包括:发声部,包括换能器和容纳所述换能器的壳体,其中,所述换能器包括振膜;耳挂,佩戴状态下,所述耳挂的第一部分挂设在用户耳廓和头部之间,所述耳挂的第二部分向所述耳廓背离所述头部的一侧延伸并连接所述发声部以将所述发声部固定于耳道附近但不堵塞耳道的位置,其中,所述壳体朝向所述耳廓的内侧面上开设出声孔,用于将所述振膜前侧产生的声音导出所述壳体后传向所述耳道,所述壳体的其它侧壁上开设有至少两个泄压孔,所述至少两个泄压孔包括第一泄压孔和第二泄压孔,所述第一泄压孔的中心与所述第二泄压孔的中心之间的距离为13.0mm-15.2mm。
- 根据权利要求1所述的开放式耳机,其中,所述出声孔的中心距所述第一泄压孔的所述中心与所述第二泄压孔的所述中心的连线的中垂面的距离为0mm~2mm。
- 根据权利要求2所述的开放式耳机,其中,所述第一泄压孔开设在所述壳体的上侧面,所述第二泄压孔开设在所述壳体的下侧面。
- 根据权利要求3所述的开放式耳机,其中,在佩戴状态下,所述壳体至少部分插入耳甲腔,所述第二泄压孔的所述中心距离所述壳体的后侧面的距离大于所述第一泄压孔的所述中心距离所述后侧面的距离。
- 根据权利要求4所述的开放式耳机,其中,所述第一泄压孔的所述中心距所述壳体朝向耳廓的所述内侧面的距离范围为4.24mm~6.38mm。
- 根据权利要求4所述的开放式耳机,其中,所述第一泄压孔的所述中心距所述后侧面的距离范围为10.44mm~15.68mm。
- 根据权利要求5或6所述的开放式耳机,其中,所述换能器包括磁路组件,所述磁路组件用于提供磁场,所述第一泄压孔的所述中心距所述磁路组件的底面的距离范围为1.31mm~1.98mm。
- 根据权利要求5或6所述的开放式耳机,其中,所述换能器包括磁路组件,所述磁路组件用于提供磁场,所述第一泄压孔的所述中心距离所述磁路组件的长轴中心面的距离范围为5.45mm~8.19mm。
- 根据权利要求4所述的开放式耳机,其中,所述第二泄压孔的所述中心距所述壳体朝向所述耳廓的所述内侧面的距离范围为4.24mm~6.36mm。
- 根据权利要求4所述的开放式耳机,其中,所述第二泄压孔的所述中心距所述后侧面的距离范围为13.51mm~20.27mm。
- 根据权利要求9或10所述的开放式耳机,其中,所述换能器包括磁路组件,所述磁路组件用于提供磁场,所述第二泄压孔的所述中心距所述磁路组件的底面的距离范围为1.31mm~1.98mm。
- 根据权利要求9或10所述的开放式耳机,其中,所述换能器包括磁路组件,所述磁路组件用于提供磁场,所述第二泄压孔的所述中心距离所述磁路组件的长轴中心面的距离范围为5.46 mm~8.20mm。
- 根据权利要求3所述的开放式耳机,其中,在佩戴状态下,所述壳体至少部分插入耳甲腔,所述第二泄压孔的面积小于所述第一泄压孔的面积。
- 根据权利要求13所述的开放式耳机,其中,所述第一泄压孔的面积范围为3.78mm2~22.07mm2,所述第二泄压孔的面积范围为2.78mm2~16.07mm2。
- 根据权利要求14所述的开放式耳机,其中,所述第一泄压孔的面积与所述上侧面的面积的比值在0.036-0.093之间,所述第二泄压孔的面积与所述下侧面的面积的比值在0.018-0.051之间。
- 根据权利要求13所述的开放式耳机,其中,所述换能器包括磁路组件,所述磁路组件用于提供磁场,所述第一泄压孔与所述第二泄压孔在所述磁路组件的长轴中心面上的投影的重合面积不大于10.77mm2。
- 根据权利要求16所述的开放式耳机,其中,所述第一泄压孔的所述中心与所述第二泄压孔的所述中心在所述磁路组件的底面所在平面的投影点的连线的长度范围为8.51mm-15.81mm。
- 根据权利要求17所述的开放式耳机,其中,所述连线与所述壳体的短轴方向的夹角的角度范围为12.85°-23.88°。
- 根据权利要求3所述的开放式耳机,其中,在佩戴状态下,所述壳体至少部分覆盖对耳轮,所述下侧面上的所述第二泄压孔的所述中心距离所述壳体的后侧面的距离与所述上侧面上的所述第一泄压孔的所述中心距离所述后侧面的距离之差小于10%。
- 根据权利要求19所述的开放式耳机,其中,所述第一泄压孔的所述中心距所述壳体朝向耳廓的所述内侧面的距离范围为4.43mm~7.96mm,或者所述第二泄压孔的所述中心距所述内侧面的距离范围为4.43mm~7.96mm。
- 根据权利要求19所述的开放式耳机,其中,所述第一泄压孔的所述中心距所述后侧面的距离范围为8.60mm~12.92mm,或者所述第二泄压孔的所述中心距所述后侧面的距离范围为8.60mm~12.92mm。
- 根据权利要求3所述的开放式耳机,其中,所述第一泄压孔的长轴尺寸与所述第一泄压孔的短轴尺寸的比值范围在1~8之间,或者所述第二泄压孔的长轴尺寸与所述第二泄压孔的短轴尺寸的比值范围在1~8之间。
- 根据权利要求3所述的开放式耳机,其中,所述第一泄压孔的所述中心与所述出声孔的中心之间具有第一距离,所述第二泄压孔的所述中心与所述出声孔之间具有第二距离,所述第一距离与所述第二距离之差小于10%。
- 根据权利要求23所述的开放式耳机,其中,所述第一距离为5.12mm~15.11mm。
- 根据权利要求3所述的开放式耳机,其中,所述第一泄压孔的所述中心在矢状面的投影点 距所述内侧面的上边界的中点在所述矢状面的投影点的距离范围不大于2mm。
- 根据权利要求25所述的开放式耳机,其中,所述内侧面的所述上边界的中点在所述矢状面的投影点距所述耳道的耳道口的中心在所述矢状面的投影点的距离范围为12mm~18mm。
- 根据权利要求25所述的开放式耳机,其中,所述第一泄压孔的所述中心在矢状面的投影点距所述耳道口的中心在所述矢状面的投影点的距离范围为12mm~18mm。
- 根据权利要求25所述的开放式耳机,其中,所述第二泄压孔的所述中心在所述矢状面的投影点距所述耳道口的中心在所述矢状面的投影点的距离范围为6.88mm~10.32mm。
- 根据权利要求25所述的开放式耳机,其中,所述第二泄压孔的所述中心在矢状面的投影点距所述内侧面的上边界的中点在所述矢状面的投影点的距离范围为14.4mm~21.6mm。
- 根据权利要求3所述的开放式耳机,其中,所述第一泄压孔的所述中心在所述矢状面的投影点距所述内侧面的下边界的1/3点在所述矢状面的投影点的距离范围为13.76mm~20.64mm。
- 根据权利要求30所述的开放式耳机,其中,所述第二泄压孔的所述中心在所述矢状面的投影点距所述内侧面的所述下边界的所述1/3点在所述矢状面的投影点的距离范围为8.16mm~12.24mm。
- 根据权利要求31所述的开放式耳机,其中,所述内侧面的所述下边界的所述1/3点在所述矢状面的投影点距所述耳道口在所述矢状面的投影点的距离范围为1.76mm~2.64mm。
- 根据权利要求3所述的开放式耳机,其中,在佩戴状态下,所述第一泄压孔与所述耳挂的所述第二部分上任意一点在所述发声部长轴方向的距离范围为5.28mm~13.02mm。
- 一种开放式耳机,包括:发声部,包括换能器和容纳所述换能器的壳体,其中,所述换能器包括振膜;耳挂,佩戴状态下,所述耳挂的第一部分挂设在用户耳廓和头部之间,所述耳挂的第二部分向所述耳廓背离所述头部的一侧延伸并连接所述发声部以将所述发声部固定于耳道附近但不堵塞耳道的位置,其中,所述壳体朝向所述耳廓的内侧面上开设出声孔,用于将所述振膜前侧产生的声音导出所述壳体后传向所述耳道,所述壳体的其它侧壁上开设有至少两个泄压孔,所述至少两个泄压孔包括第一泄压孔和第二泄压孔,所述出声孔的中心距所述第一泄压孔的中心与所述第二泄压孔的中心的连线的中垂面的距离为0mm~2mm。
- 一种开放式耳机,包括:发声部,包括换能器和容纳所述换能器的壳体,其中,所述换能器包括振膜;耳挂,在佩戴状态下,所述耳挂的第一部分挂设在用户耳廓和头部之间,所述耳挂的第二部分向所述耳廓背离所述头部的一侧延伸并连接所述发声部以将所述发声部固定于耳道附近但不堵塞耳道的位置,其中,所述壳体朝向所述耳廓的内侧面上开设出声孔,用于将所述振膜前侧产生的声音导出所述壳体后传向所述耳道,所述壳体的其它侧壁上开设有至少两个泄压孔,所述至少两个泄压孔包括第一泄压孔和第二泄压孔,所述壳体至少部分插入耳甲腔,所述第二泄压孔的面积小于所述第一泄压孔的面积。
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