Acoustic unit for an in-ear earphone

Abstract

Acoustic unit (1) for an in-ear earphone (31), with a tweeter channel (3) for high-frequency sound waves and with a woofer channel (4) for low-frequency sound waves.

Description

[0001] The present invention relates to an acoustic unit for an in-ear earphone, with a tweeter channel for high-frequency sound waves and with a woofer channel for low-frequency sound waves.

[0002] The object of the present invention is to eliminate the disadvantages known from the prior art, in particular to provide improved acoustics.

[0003] The problem is solved by an acoustic unit, a loudspeaker unit, and / or an in-ear earphone with the features of the independent claims. Advantageous or preferred embodiments are each subject of a corresponding dependent claim.

[0004] The proposed acoustic unit is for an in-ear earphone. The in-ear earphone is designed to be inserted into the ear canal. The in-ear earphone can be used for listening to music or making phone calls, for example.

[0005] The acoustic unit includes a tweeter channel for high-frequency sound waves. The high-frequency sound waves can be generated by a tweeter.

[0006] The acoustic unit also includes a woofer channel for low-frequency sound waves. The low-frequency sound waves can be generated by a woofer. The routing of the high and low frequencies, or the high and low frequency sound waves, enables targeted acoustic separation, reducing interference and improving sound reproduction. This leads to more precise reproduction of music and speech content across a broad frequency spectrum.

[0007] Advantageously, the acoustic unit features a mixing channel. The tweeter channel and the woofer channel lead into the mixing channel. The mixing channel allows the acoustic summation of the separately routed frequency components and ensures coherent sound radiation at the output of the acoustic unit. This improves the phase response and the localization of sound sources.

[0008] It is advantageous if the acoustic unit has a tweeter volume. This creates a front volume for a tweeter. The tweeter volume is thus a tweeter front volume. The tweeter radiates the high-frequency sound waves into this tweeter volume. The tweeter volume serves as the acoustic working volume for the tweeter and influences the tweeter's resonance characteristics. Targeted dimensioning of this tweeter volume can increase the sound pressure level in the high-frequency range.

[0009] According to an advantageous development of the invention, the acoustic unit has a woofer volume. This forms a front volume for a woofer. The woofer volume is thus a front volume for the woofer. The woofer radiates the low-frequency sound waves into this woofer volume. The woofer volume serves as the acoustic working volume for the woofer and enables deeper bass reproduction. Furthermore, the volume can be adjusted so that it can be combined with a Helmholtz resonator to filter higher frequencies.

[0010] Furthermore, it is advantageous if the woofer volume is arranged around the tweeter volume. The woofer volume and the tweeter volume are separated from each other. This concentric arrangement saves space in the in-ear housing without compromising the acoustic decoupling of the two volumes. This separation prevents mutual influence of their resonance properties.

[0011] In an advantageous development of the invention, the tweeter channel and the tweeter volume are designed and / or dimensioned such that they form a first Helmholtz resonator. The first Helmholtz resonator comprises the tweeter channel and the tweeter volume, whose geometric parameters define a characteristic resonance frequency. This allows a targeted increase in the sound pressure level of the tweeter in the range of approximately 10 kHz. The first Helmholtz resonator is thus a tweeter-Helmholtz resonator.

[0012] According to an advantageous development of the invention, the woofer channel and the woofer volume are designed and / or dimensioned such that they form a second Helmholtz resonator. The second Helmholtz resonator, or the woofer-Helmholtz resonator, acts as an acoustic low-pass filter that significantly attenuates frequencies above its resonance frequency—for example, around 5 kHz. This reduces crosstalk to the high-frequency range and contributes to a balanced sound.

[0013] It is advantageous if the tweeter and woofer channels run side by side, at least in some sections. This allows for a space-saving design of the acoustic unit and a parallel arrangement within the enclosure.

[0014] Furthermore, it is advantageous if the tweeter channel and the woofer channel are separated from each other, at least in sections. This acoustic and mechanical separation prevents mutual influence of the sound waves in the two channels.

[0015] It is advantageous if the tweeter and woofer channels run parallel to each other, at least in some sections. A parallel layout promotes a symmetrical arrangement and uniform sound radiation.

[0016] Advantageously, the tweeter channel is designed to be straight, at least in some sections. Straight channels minimize acoustic losses due to reflections and / or diffraction.

[0017] Additionally or alternatively, it is advantageous if the woofer channel is designed to be straight, at least in sections. This improves the acoustic efficiency of the bass transmission and can minimize acoustic losses due to reflections and / or diffraction.

[0018] According to an advantageous development of the invention, the cross-sectional area of ​​the mixing channel is larger than the sum of the cross-sectional areas of the tweeter channel and the woofer channel. A larger mixing channel area prevents backflow and excessive sound pressure in the merging area.

[0019] In addition, it is advantageous if a cross-sectional area of ​​the woofer channel is larger than a cross-sectional area of ​​the tweeter channel.

[0020] Advantageously, the tweeter channel is longer than the woofer channel.

[0021] It is advantageous to place an acoustic damping element between the woofer channel and the woofer volume. This acoustic damping element dampens resonances and increases the efficiency of the low-pass filter.

[0022] It is advantageous if the acoustic damping element between the woofer channel and the woofer volume has a characteristic acoustic impedance of 160 MKS Rayls. This value results in optimal acoustic impedance for effective damping without compromising bass reproduction.

[0023] Furthermore, it is advantageous if the tweeter and / or woofer have a round cross-section. A round cross-section minimizes reflections and / or diffraction and enables even sound propagation.

[0024] As a supplement or alternative, it is advantageous if the woofer volume has a round cross-section. A round cross-section minimizes reflections and / or diffraction and enables even sound propagation.

[0025] Advantageously, the tweeter channel has a length, in particular an average length, of 3.5 mm.

[0026] It is advantageous if the tweeter channel has a diameter, especially an average diameter, of 1.5 mm.

[0027] Furthermore, it is advantageous if the tweeter channel has a round cross-section. A round cross-section reduces airflow losses and minimizes reflections and / or diffraction.

[0028] It is advantageous if the tweeter volume has a volume of 5.56 mm 3 has.

[0029] According to an advantageous development of the invention, the tweeter volume has a diameter of 2 mm.

[0030] It is advantageous if the woofer channel has a diameter, especially an average diameter, of 1.1 mm.

[0031] In addition, it is advantageous if the woofer channel has a cross-sectional area of ​​4 mm 2 has.

[0032] Advantageously, the woofer volume has a volume of 47.8 mm 3 on.

[0033] It is advantageous if the mixing channel has a length of 8 mm. The mixing channel has a length greater than 3 mm.

[0034] The values ​​and dimensions of the tweeter channel, the woofer channel, the tweeter volume, the woofer volume, and the mixing channel specified in the previous section result in optimal acoustic properties of the acoustic unit. The specified values ​​can have a tolerance of + / - 10% without significantly degrading the acoustic properties.

[0035] According to an advantageous development of the invention, the woofer channel has a curved and / or oval cross-section. Additionally or alternatively, the woofer channel is arranged at least partially curved around the tweeter channel. This enables a compact arrangement of the acoustic components while maintaining consistent functionality.

[0036] Furthermore, it is advantageous if the acoustic unit has a housing body. The tweeter channel, the woofer channel, the mixing channel, at least partially the tweeter volume, and / or at least partially the woofer volume are arranged in the housing body. The two channels, in particular, can be separated from each other, at least in sections, by the housing body or by sections of the housing body.

[0037] It is advantageous if the tweeter channel has a first inlet and the woofer channel has a second inlet. The first inlet protrudes beyond the second inlet. The offset arrangement of the inlet openings allows for optimal positioning of the transducer unit with respect to its acoustic paths and improves the decoupling of the frequency ranges right at the input.

[0038] Advantageously, the first inlet opening of the tweeter channel and the second inlet opening of the woofer channel are oriented obliquely to each other.

[0039] It is advantageous if the first inlet opening and the second inlet opening are arranged next to each other. This allows for a compact arrangement of the acoustic unit and a compact design of the sound transducer unit.

[0040] Furthermore, it is advantageous if the tweeter channel has a first outlet and the woofer channel a second outlet. Separate outlets contribute to the precise dispersion characteristics of the respective frequency components and facilitate the targeted sound guidance toward the mixing channel and the ear canal.

[0041] It is advantageous if the tweeter volume has a third inlet and the woofer volume a fourth inlet. These inlet openings form the acoustic interface to the transducer unit and influence the acoustic mass of the respective resonators.

[0042] Advantageously, the acoustic unit has a pressure equalization duct with a pressure equalization duct opening. The pressure equalization duct serves to reduce pressure differences with the environment. The pressure equalization duct can be sealed from the environment with an air damping element. The air damping element is permeable to air but dampens air flow. The air damping element can be a fabric that allows pressure equalization but significantly dampens the air flow.

[0043] Furthermore, it is advantageous if the acoustic unit has a recess. The compensation duct opening opens into the recess. The air damping element is arranged and / or can be arranged in the recess. The recess serves as a mechanical seat for the element and supports its reproducible assembly.

[0044] Advantageously, the acoustic unit has a coupling area. An earpiece can be coupled to the acoustic unit or is already coupled thereto. The coupling area represents the connection between the acoustic unit and the earmold or earpiece. A defined coupling ensures sound quality and comfort. The earpiece can be made of silicone, for example, and is inserted at least partially into the ear canal.

[0045] It is advantageous if the acoustic unit has a receiving area, in particular a receiving base. The sound transducer unit can be accommodated or is already accommodated in the receiving area. A mechanically defined receiving area facilitates the precise positioning and installation of the sound transducer unit and ensures optimal acoustic coupling.

[0046] Furthermore, a loudspeaker module comprising a sound transducer unit and an acoustic unit is proposed. The acoustic unit is designed according to one or more of the previously described and / or following features. This enables the complete integration of the acoustic operating principles, including defined Helmholtz resonators and acoustic channels, into a modular loudspeaker system.

[0047] Furthermore, it is advantageous if the transducer unit includes a tweeter and a woofer. The use of both transducer types enables frequency-separated signal processing and improves sound quality across the entire audible range. This contributes to optimizing the transmission characteristics and reducing harmonic distortion. The tweeter can, for example, be a MEMS transducer, which is particularly good at generating high-frequency sound waves.

[0048] The woofer can also be, for example, an electrodynamic sound transducer that can generate the low-frequency sound waves particularly well.

[0049] It is advantageous if the first and / or second Helmholtz resonator are designed and / or dimensioned to function as an acoustic low-pass filter. A Helmholtz resonator acting as an acoustic low-pass filter allows only frequencies below its resonance frequency to pass through virtually unhindered, while higher frequencies are significantly attenuated. This allows for targeted limitation of the respective frequency range, improves the acoustic separation between high and low frequency components, and contributes to sound clarity.

[0050] It is advantageous if the woofer is arranged, especially concentrically, around the tweeter. This concentric arrangement reduces the required footprint.

[0051] It is advantageous if at least one acoustic seal is arranged between the acoustic unit and the sound transducer unit. Such a seal ensures a defined acoustic coupling of the sound transducer unit to the associated acoustic volumes. This prevents leaks and increases the efficiency of sound transmission.

[0052] Furthermore, it is advantageous if at least one acoustic seal seals the tweeter and woofer volumes from each other. This seal ensures acoustic decoupling of the two volumes and prevents mutual influence of their resonance properties. This contributes to the acoustic separation of the high and low frequency components.

[0053] It is advantageous if the transducer unit is mounted in the receiving area of ​​the acoustic unit. From there, the tweeter of the transducer unit can radiate the high-frequency sound waves into the tweeter volume and / or the tweeter channel. Additionally or alternatively, the woofer of the transducer unit can radiate the low-frequency sound waves into the woofer volume and / or the woofer channel. The targeted coupling of the transducer unit to the tweeter channel and / or the woofer channel enables controlled excitation of the respective Helmholtz resonators. This increases the acoustic efficiency of the overall system.

[0054] Also proposed is an in-ear earphone with an acoustic unit and at least one sound transducer unit for generating and / or detecting sound waves. The acoustic unit is preferably designed according to one or more features of the preceding and / or following description, wherein the aforementioned features may be present individually or in any combination.

[0055] It's advantageous if the transducer unit includes both a tweeter and a woofer. Using separate transducers for high and low frequencies allows for a wider bandwidth and better sound reproduction.

[0056] Furthermore, it is advantageous if the transducer unit is mounted in the receiving area of ​​the acoustic unit. A tweeter in the transducer unit can radiate sound waves into the tweeter volume and / or tweeter channel. The targeted guidance of the tweeter sound into the intended acoustic volumes enables precise control of the tweeter resonator and improves sound brilliance.

[0057] Alternatively or additionally, it is advantageous if a woofer in the transducer unit can radiate sound waves into the woofer volume and / or the woofer channel. The controlled coupling of the woofer to the woofer volume ensures effective bass amplification and minimizes interference with the high-frequency components.

[0058] It is advantageous if the in-ear earphone includes an earpiece. The earpiece enables a defined mechanical and acoustic coupling of the acoustic unit to the ear canal. This improves the acoustic seal and increases the efficiency of sound transmission as well as wearing comfort.

[0059] Furthermore, it's advantageous if the in-ear headphones are either wired or wireless. The wired or wireless version allows for flexible adaptation to different applications and user requirements. Especially with wireless versions, the acoustic unit can be integrated with minimal space requirements and optimized energy efficiency.

[0060] Furthermore, it is advantageous if the in-ear headphones, especially the wireless version, include a battery so that wireless operation is possible.

[0061] It is also advantageous if the in-ear headphones include a wireless interface, such as Bluetooth, so that wireless operation is possible.

[0062] Further advantages of the invention are described in the following exemplary embodiments. They show: Fig. 1 a sectional view of an acoustic unit with a tweeter channel and a woofer channel, Fig. 2 a perspective view from above of the acoustic unit, Fig. 3 a perspective view of a sound transducer unit, Fig. 4 a perspective view from above of the acoustic unit with sound transducer unit, Fig. 5 a perspective view of the acoustic unit and sound transducer unit, Fig. 6 a perspective view of an in-ear earphone.

[0063] In the following figures, some features may be identified or numbered using the designations "first," "second," "third," etc. This serves to distinguish or simplify the explanation of the features in the figures. This does not necessarily imply an order of the corresponding features. In particular, this does not necessarily imply a hierarchical order of the features.

[0064] Fig. 1 shows a sectional view of an acoustic unit 1 with a tweeter channel 3 and a woofer channel 4.

[0065] In the Fig. 1 shows an acoustic unit 1. The acoustic unit 1 is designed for the targeted guidance of sound waves from different frequency ranges and serves to improve sound reproduction through acoustic separation.

[0066] The Fig. The acoustic unit 1 shown in Figure 1 has a sound channel 2. The sound channel 2 comprises the tweeter channel 3, the woofer channel 4, and the mixing channel 5 described below.

[0067] Furthermore, the Fig. The embodiment shown in Figure 1 includes the aforementioned tweeter channel 3. The tweeter channel 3 serves to guide high-frequency sound waves. The tweeter channel 3 has a first inlet opening 9 through which the high-frequency sound waves can enter the tweeter channel 3.

[0068] In addition, the acoustic unit 1 has a woofer channel 4. The woofer channel 4 guides low-frequency sound waves and thus serves to separate the low-frequency sound waves from the high-frequency sound waves. This enables acoustic decoupling between high and low-frequency frequencies. The woofer channel 4 has a second inlet opening 10 through which the low-frequency sound waves can enter the woofer channel 4.

[0069] The embodiment of the Fig. 1 comprises the mixing channel 5. The mixing channel 5 is designed as a merging area for the tweeter channel 3 and the woofer channel 4. The tweeter channel 3 and the woofer channel 4 lead into the mixing channel 5. The high-frequency sound waves and the low-frequency sound waves are also merged in the mixing channel 5.

[0070] The sound waves guided in the two channels 3, 4 can enter the mixing channel 5 via a first outlet opening 11 of the tweeter channel 3 and a second outlet opening 12 of the woofer channel 4. The mixing channel 5 further has a channel outlet opening 13 through which the sound waves guided in the mixing channel 5 can exit the mixing channel 5.

[0071] As can be seen from the example of Fig. As can be seen from Figure 1, the acoustic unit 1 has a tweeter volume 6. The tweeter volume 6 serves as an acoustic working volume for high-frequency frequencies and has a third inlet opening 14 through which the high-frequency sound waves can enter the tweeter volume 6. The targeted dimensioning of the tweeter volume 6 enables the formation of a first Helmholtz resonator. The first Helmholtz resonator is formed here by the tweeter channel 3 and the tweeter volume 6. The first Helmholtz resonator is thus a high-frequency Helmholtz resonator.

[0072] In addition, Fig. 1 shows a woofer volume 7. The woofer volume 7 is arranged around the tweeter volume 6 and connected to the woofer channel 4 via a fourth inlet opening 15. The concentric arrangement saves space and supports acoustic decoupling of the frequency ranges. The targeted dimensioning enables the formation of a second Helmholtz resonator. The second Helmholtz resonator is formed here by the woofer channel 4 and the woofer volume 7. The second Helmholtz resonator is thus a low-frequency Helmholtz resonator.

[0073] The acoustic unit 1 comprises according to Fig. 1 a housing body 8. The housing body 8 accommodates the acoustic channels 3, 4 as well as the volumes 6, 7 and forms the supporting structure of the entire acoustic unit 1. The channels 3, 4 as well as the volumes 6, 7 are arranged partially or completely in the housing body 8.

[0074] In the embodiment of the Fig. 1, a first inlet opening 9 is provided. The first inlet opening 9 is assigned to the tweeter channel 3 and allows the entry of the high-frequency sound waves from a sound transducer unit 23.

[0075] Additionally, a second inlet opening 10 is shown. The second inlet opening 10 is assigned to the woofer channel 4. It is located below the first inlet opening 9 in the illustration and allows separate coupling of the low-frequency range and the entry of the low-frequency sound waves from the sound transducer unit 23.

[0076] Furthermore, the tweeter channel 3 has the first outlet opening 11. The woofer channel 4 has the second outlet opening 12. The sound waves enter the mixing channel 5 via these two outlet openings 11, 12.

[0077] In addition, Fig. 1, an acoustic damping element 32. The acoustic damping element 32 is arranged between the woofer channel 4 and the woofer volume 7. Here, the acoustic damping element 32 is arranged in the area of ​​the second inlet opening 10, where the low-frequency sound waves enter the woofer channel 4. The acoustic damping element 32 serves to specifically dampen resonances in the low-frequency range and / or supports the effect of a Helmholtz resonator as an acoustic low-pass filter. The acoustic damping element 32 is shown here in dotted and dashed lines.

[0078] According to Fig. 1, the third inlet opening 14 is provided. This forms the acoustic connection to the tweeter volume 6.

[0079] In addition, Fig. 1 shows the fourth inlet opening 15. Through this opening, the woofer volume 7 is open, allowing sound waves to enter.

[0080] Furthermore, the embodiment of the Fig. 1 has a compensation duct opening 17. This is associated with a pressure compensation duct 16, which enables the reduction of pressure differences between the interior of the acoustic unit 1 and the environment. The compensation duct opening 17 can be closed using an air damping element. The air damping element is permeable to air but dampens air flow. The air damping element can be formed, for example, from a mesh or a grid.

[0081] In the Fig. 1 also shows a recess 18. The air damping element can be inserted into this recess 18. The recess 18 serves to mechanically fix and precisely position this element to ensure reproducible pressure equalization.

[0082] The illustrated embodiment also comprises a coupling area 28. The coupling area 28 allows the mechanical and acoustic coupling of an earpiece 29 to the acoustic unit 1. A defined coupling ensures a stable fit and low-loss sound transmission to the ear canal.

[0083] Features that have already been described in at least one previous figure cannot be explained again for the sake of simplicity. Furthermore, features can also be described in this or in at least one of the subsequent figures. Furthermore, for the sake of simplicity, the same reference symbols are used for the same features. Moreover, for the sake of clarity, not all features can be shown and / or provided with a reference symbol in the following figures. However, features shown in one or more of the previous figures can also be present in this or in one or more of the subsequent figures. Furthermore, for the sake of clarity, features can also be shown and / or provided with a reference symbol in this or in one or more of the subsequent figures.Nevertheless, features which are only shown in one or more of the subsequent figures may already be present in this or a previous figure.

[0084] Fig. 2 shows a perspective view from above of the acoustic unit 1 with the tweeter channel 3, the woofer channel 4, the tweeter volume 6 and the woofer volume 7.

[0085] In the Fig. Figure 2 shows a perspective view of an acoustic unit 1. This illustration provides a view of the internal structure of the acoustic channels 3, 4 and the acoustic volumes 6, 7.

[0086] Tweeter channel 3 is shown here. Tweeter channel 3 is located centrally and serves to direct high-frequency sound waves.

[0087] As from Fig. As can be seen in Figure 2, woofer channel 4 is also visible. Woofer channel 4 runs alongside tweeter channel 3 and is designed to guide the low-frequency sound waves separately. This spatial separation enables acoustic decoupling of the two frequency ranges. The low-frequency sound waves, for example, can have frequencies up to 5 kHz. The high-frequency sound waves, on the other hand, can have frequencies above 5 kHz. However, the frequencies of the low-frequency sound waves and the high-frequency sound waves may overlap.

[0088] In addition, Fig. 2, the tweeter volume 6 is visible. The tweeter volume 6 merges downwards into the tweeter channel 3. The high-frequency sound waves thus first reach the tweeter volume 6 and then into the tweeter channel 3. The tweeter volume 6 and / or the tweeter channel 3 are, as can be seen here, cylindrical in shape. However, the tweeter volume 6 and the tweeter channel 3 are not arranged coaxially to each other, but between them there is a bend, which is also evident in the Fig. 1 can be seen.

[0089] Additionally, the exemplary embodiment shows the woofer volume 7. The woofer volume 7 is arranged around the tweeter volume 6 and is formed by a ring-shaped geometry. The concentric arrangement of the woofer volume 7 enables space-saving integration while simultaneously maintaining separate resonance formation.

[0090] As can also be seen here, the woofer volume 7 has a significantly larger cross-section than the woofer channel 4. The woofer volume 7 extends in a ring around the tweeter volume 6, with the woofer channel 4 being arranged only in a section adjacent to the tweeter channel 3.

[0091] In the embodiment of the Fig. 2, a separating element 19 is also shown. The separating element 19 is designed as an annular web and separates the woofer volume 7 from the tweeter volume 6. This separation prevents mutual influence of the resonance properties and increases the acoustic efficiency of both resonators. A seal 26 can be arranged on top of the separating element 19, which seals the woofer volume 7 from the tweeter volume 6. However, the seal 26 only seals when the sound transducer unit 23 is inserted into the acoustic unit 1, as shown in Fig. 4. The at least one seal 26 is then arranged between the acoustic unit 1, as described here on the separating element 19, and the sound transducer unit 23.

[0092] Furthermore, in Fig. 2 shows a receiving area 20. The receiving area 20 is designed as a recess and serves to receive and / or position the sound transducer unit 23. The precise shape supports the exact position of the sound transducer unit 23. The receiving area 20 can, as shown here, be designed as a receiving base.

[0093] As can be seen from the example of Fig. As can be seen from Figure 2, the acoustic unit 1 has a receiving recess 21. The receiving recess 21 is arranged within the receiving area 20 and serves for the mechanical fixation of a sound transducer unit 23. The sound transducer unit 23 can be guided in a form-fitting manner in the receiving recess 21, so that the sound waves can be introduced very precisely into the tweeter channel 3, the woofer channel 4, the tweeter volume 6 and / or the woofer volume 7.

[0094] In addition, Fig. 2 a receiving space 22. The receiving space 22 is formed by the receiving recess 21 and is intended to accommodate the sound transducer unit 23. The stepped geometry of the receiving recess 21 and the receiving space 22 enables stable and correct mounting.

[0095] Also visible in Fig. 2 the pressure equalization channel 16. The pressure equalization channel 16 is intended for connection to the ambient air and enables the reduction of pressure differences between internal and external pressure.

[0096] Fig. 3 shows a perspective view of the sound transducer unit 23 with a tweeter 24, a woofer 25, a transducer housing 27 and a seal 26.

[0097] The embodiment of the Fig. 3 comprises a sound transducer unit 23. The sound transducer unit 23 serves to generate sound waves of different frequency ranges, particularly for high-frequency and low-frequency frequencies. It forms the sound-emitting component of the loudspeaker module 33 and / or the in-ear earpiece 31.

[0098] As can be seen from the example of Fig. As can be seen in Figure 3, the sound transducer unit 23 has a tweeter 24. The tweeter 24 is preferably designed as a MEMS sound transducer and is intended for generating high-frequency sound waves. Precise coupling to a tweeter volume 6 and / or to a tweeter channel 3 enables targeted excitation of an acoustic Helmholtz resonator.

[0099] Furthermore, the sound transducer unit 23 comprises a woofer 25. The woofer 25 can be designed, in particular, as an electrodynamic sound transducer and is intended for generating low-frequency sound waves. The sound waves radiated toward a woofer volume 7 and / or a woofer channel 4 can thus contribute to the formation of a Helmholtz resonator.

[0100] According to the present embodiment, the woofer 25 is arranged, in particular concentrically, around the tweeter 24.

[0101] The Fig. The sound transducer unit 23 shown in Figure 3 has a transducer housing 27. The transducer housing 27 encloses the electrical and mechanical components of the tweeter 24 and the woofer 25. It ensures a mechanically stable unit and enables precise positioning within a pickup area 20 of the acoustic unit 1.

[0102] As from Fig. 3, at least one seal 26 is provided. The seal 26 is designed as an acoustic seal and can be arranged between the sound transducer unit 23 and the acoustic unit 1. The seal 26 ensures a low-loss acoustic coupling of the generated sound waves to the intended acoustic volumes. In addition, the seal 26 can seal the tweeter volume 6 and the woofer volume 7 from one another, thereby preventing mutual influence of the resonance properties. The seal 26 shown here surrounds the woofer 25 and thus also the tweeter 24. Furthermore, a further seal 26, not shown here, can be provided, which is arranged between the tweeter 24 and the woofer 25. This can advantageously also be annular and seal the tweeter 24 from the woofer 25. This seal 26 can then be mounted on the separating element 19 of the Fig. 2 sit down.

[0103] Fig. Figure 4 shows a perspective view from above of an acoustic unit 1 with the inserted sound transducer unit 23, wherein the sound transducer unit 23 is accommodated in a receiving space 22. The arrangement is part of a loudspeaker module 33.

[0104] The Fig. The embodiment shown in Figure 4 shows an acoustic unit 1 into which the sound transducer unit 23 is inserted.

[0105] As can be seen from the exemplary embodiment, the sound transducer unit 23 is accommodated in the receiving space 22 or in the receiving recess 21. This ensures an acoustically precise coupling to the assigned channels and volumes.

[0106] Fig. 5 shows a perspective view of an acoustic unit 1 with the integrated sound transducer unit 23, the sound channel 2, the coupling area 28 and the loudspeaker module 33.

[0107] The Fig. The embodiment shown in Figure 5 comprises an acoustic unit 1, which is part of a loudspeaker module 33. The loudspeaker module 33 is shown in a side view with the sound transducer unit 23 inserted.

[0108] In addition, Fig. 5 the coupling area 28. The coupling area 28 is intended for the mechanical and acoustic connection of the earpiece 29 with the acoustic unit 1 or the loudspeaker module 33. A defined coupling ensures the reproducible positioning of the earpiece 29 and a low-loss transmission of the sound waves from the sound channel 2 into the ear canal.

[0109] Fig. 6 shows a perspective view of the in-ear earphone 31 with the acoustic unit 1, the sound transducer unit 23, the earpiece 29 and a main outlet opening 30.

[0110] As can be seen from the example of Fig. As can be seen in Figure 6, the in-ear earpiece 31 has the earpiece 29. The earpiece 29 is arranged on the coupling area 28 of the acoustic unit 1 and is inserted into the ear canal. It establishes the mechanical and acoustic coupling between the acoustic unit 1 or the in-ear earpiece 31 and the user's ear canal.

[0111] In addition, Fig. 6 shows the main exit opening 30. The main exit opening 30 is located at the end of the earpiece 29 and represents the final sound exit point toward the auditory canal. It is acoustically connected to a sound channel 2 and contributes to the targeted radiation of the sound. List of reference symbols 1 acoustic unit 2 sound channels 3 tweeter channels 4 woofer channels 5 mixing channel 6 tweeter volume 7 woofer volume 8 Housing body 9 first entrance opening 10 second entrance opening 11 first exit opening 12 second outlet opening 13 Channel outlet opening 14 third entrance opening 15 fourth entrance opening 16 pressure equalization channel 17 Compensation channel opening 18 Deepening 19 Separator 20 Recording area 21 Recording recess 22 Recording room 23 Transducer unit 24 tweeters 25 woofers 26 Seal 27 converter housing 28 coupling area 29 Earpiece 30 Main outlet opening 31 in-ear headphones 32 acoustic damping element 33 speaker module

Claims

[1] Acoustic unit (1) for an in-ear earphone (31), with a tweeter channel (3) for high-frequency sound waves and with a woofer channel (4) for low-frequency sound waves. [2] Acoustic unit (1) according to the previous claim, characterized by that the acoustic unit (1) comprises a mixing channel (5) into which the tweeter channel (3) and the woofer channel (4) lead. [3] Acoustic unit (1) according to one of the preceding claims, characterized by that the acoustic unit (1) comprises a tweeter volume (6) which forms a front volume for a tweeter (24). [4] Acoustic unit (1) according to one of the preceding claims, characterized by that the acoustic unit (1) comprises a woofer volume (7) which forms a front volume for a woofer (25). [5] Acoustic unit (1) according to one of the preceding claims, characterized bythat the woofer volume (7) is arranged around the tweeter volume (6), wherein the woofer volume (7) and the tweeter volume (6) are separated from each other. [6] Acoustic unit (1) according to one of the preceding claims, characterized by that the tweeter channel (3) and the tweeter volume (6) are designed and / or dimensioned such that they form a first Helmholtz resonator. [7] Acoustic unit (1) according to one of the preceding claims, characterized by that the woofer channel (4) and the woofer volume (7) are designed and / or dimensioned such that they form a second Helmholtz resonator. [8] Acoustic unit (1) according to one of the preceding claims, characterized by that the first and / or the second Helmholtz resonator are designed and / or dimensioned such that they are an acoustic low-pass filter. [9] Acoustic unit (1) according to one of the preceding claims, characterized bythat a cross-sectional area of ​​the mixing channel (5) is larger than the sum of the cross-sectional areas of the tweeter channel (3) and the woofer channel (4). [10] Acoustic unit (1) according to one of the preceding claims, characterized by that a cross-sectional area of ​​the woofer channel (4) is larger than a cross-sectional area of ​​the tweeter channel (3). [11] Acoustic unit (1) according to one of the preceding claims, characterized by that an acoustic damping element is arranged between the woofer channel (4) and the woofer volume (7), wherein the acoustic damping element between the woofer channel (4) and the woofer volume (7) preferably has a characteristic sound impedance of 160 MKS Rayls. [12] Acoustic unit (1) according to one of the preceding claims, characterized by that the tweeter volume (6) and / or the woofer volume (7) has a round cross-section. [13] Acoustic unit (1) according to one of the preceding claims, characterized bythat the tweeter channel (3) has a, in particular average, length of 3.5 mm and / or that the tweeter channel (3) has a, in particular average, diameter of 1.5 mm and / or that the tweeter channel (3) has a round cross-section and / or that the tweeter volume (6) has a volume of 5.56 mm 3 and / or that the tweeter volume (6) has a diameter of 2 mm. [14] Acoustic unit (1) according to one of the preceding claims, characterized by that the woofer channel (4) has a, in particular average, diameter of 1.1 mm and / or that the woofer channel (4) has a cross-sectional area of ​​4 mm 2 and / or that the woofer volume (7) has a volume of 47.8 mm 3 has. [15] Acoustic unit (1) according to one of the preceding claims, characterized bythat the mixing channel (5) has a length of 8 mm and a length greater than 3 mm. [16] Acoustic unit (1) according to one of the preceding claims, characterized by that the woofer channel (4) has a curved and / or oval cross-section and / or that the woofer channel (4) is arranged bent around the tweeter channel (3) at least in sections. [17] Acoustic unit (1) according to one of the preceding claims, characterized by that the acoustic unit (1) has a housing body (8) in which the tweeter channel (3), the woofer channel (4), the mixing channel (5), at least partially the tweeter volume (6) and / or at least partially the woofer volume (7) are arranged. [18] Acoustic unit (1) according to one of the preceding claims, characterized by that the acoustic unit (1) comprises a receiving area (20), in particular a receiving base, in which a sound transducer unit (23) can be or is received. [19] Speaker module (33) with a sound transducer unit (23) and an acoustic unit (1), characterized by , that the acoustic unit (1) is designed according to one or more of the preceding claims. [20] Loudspeaker module (33) according to the previous claim, characterized by that the sound transducer unit (23) comprises the tweeter (24) and the woofer (25). [21] Loudspeaker module (33) according to one of the preceding claims, characterized by that the woofer (25) is arranged, in particular concentrically, around the tweeter (24). [22] Loudspeaker module (33) according to one of the preceding claims, characterized by that at least one acoustic seal is arranged between the acoustic unit (1) and the sound transducer unit (23). [23] Loudspeaker module (33) according to one of the preceding claims, characterized bythat the at least one acoustic seal seals the tweeter volume (6) and the woofer volume (7) from each other. [24] Loudspeaker module (33) according to one of the preceding claims, characterized by that the sound transducer unit (23) is accommodated in the receiving area (20) of the acoustic unit (1) and that a tweeter (24) of the sound transducer unit (23) can radiate sound waves into the tweeter volume (6) and / or into the tweeter channel (3) and / or that a woofer (25) of the sound transducer unit (23) can radiate sound waves into the woofer volume (7) and / or into the woofer channel (4). [25] In-ear headphones (31) with an acoustic unit (1) and with at least one sound transducer unit (23) for generating and / or detecting sound waves, characterized by , that the acoustic unit (1) is designed according to one or more of the preceding claims. [26] In-ear earphone (31) according to the previous claim, characterized by that the in-ear earphone (31) comprises an earpiece (29) and / or that the in-ear earphone (31) is wired or wireless.

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