Sound production monomer, sound production module and electronic equipment

Abstract

The invention discloses a sound production monomer, a sound production module and an electronic device, the sound production monomer comprises a shell, a magnetic circuit system and a vibration system, the vibration system comprises a first vibrating diaphragm, a second vibrating diaphragm and a voice coil, two ends of the voice coil are respectively connected with the first vibrating diaphragm and the second vibrating diaphragm, and the magnetic circuit system is provided with a magnetic gap. The magnetic circuit system is provided with a first center hole which is arranged in a penetrating mode in the vibration direction of the vibration system, the first vibrating diaphragm is provided with a second center hole, and the first center hole and the second center hole are communicated to form a sound guide channel. According to the sound production monomer provided by the invention, the two vibrating diaphragms are synchronously driven by one voice coil, so that the occupied volume of the whole sound production monomer can be reduced; in the working process, the two vibrating diaphragms vibrate in the same direction, sound waves generated by the second vibrating diaphragm are transmitted through the sound guide channel and superposed with sound waves generated by the first vibrating diaphragm, superposition of double-face performance of the vibrating system is achieved, and the overall performance is improved.

Description

[0001] The present invention relates to the field of electroacoustic technology, and particularly to a sounding element, a sounding module using the sounding element, and an electronic device. Background Art

[0002] With the popularization of in-ear wireless headphones, users' requirements for headphone sound quality, wearing comfort, and performance are constantly increasing, driving the internal monomer structure design of headphones into a stage of refined innovation design. The monomer structures of traditional Bluetooth headphones mostly adopt single dynamic coil or single balanced armature drive units with single-sided vibration sound production, but there are limitations in full-frequency response, spatial audio adaptation, etc. For example, the single dynamic coil unit is affected by various factors such as the diaphragm material, resulting in loss of high-frequency details and reduced performance. The traditional design scheme has a very limited vibration space based on a limited size, resulting in a relatively limited space for performance improvement, which cannot meet the requirements of current wearable audio devices such as wireless headphones. Therefore, finding a new design architecture has become a crucial factor in improving the performance of the entire product. The conventional headphone sounding element designs are all single-sided vibration sound production. In a limited cavity of the whole machine, it is very difficult to increase the vibration area and vibration displacement, so the conventional design is very limited in improving the product and the performance of the whole machine.

[0003] To increase the sounding area of the sounding element, in the related art, a sounding device is proposed. A set of vibration systems are respectively arranged on the opposite sides of the magnetic circuit system of the sounding device. Each vibration system includes a diaphragm assembly and a voice coil. Although this structure can solve the problem of small sounding area mentioned above, however, the two diaphragm assemblies need to be driven and vibrated by separate voice coils respectively, and the structural design of the magnetic circuit system and the corresponding vibration system is relatively complex, greatly reducing the practicability. Summary of the Invention

[0004] The main object of the present invention is to provide a sounding element, a sounding module, and an electronic device. The sounding element can increase the sound output area and improve the overall sounding effect of the sounding element.

[0005] To achieve the above object, the sounding element of the first technical solution proposed by the present invention includes: A housing; A magnetic circuit system, the magnetic circuit system is fixed to the housing, and the magnetic circuit system is provided with a magnetic gap; A vibration system, the vibration system includes a first diaphragm, a second diaphragm, and a voice coil. The first diaphragm and the second diaphragm are respectively arranged on the opposite sides of the magnetic circuit system. The voice coil is inserted into the magnetic gap, and along the vibration direction of the vibration system, the two ends of the voice coil are respectively connected to the first diaphragm and the second diaphragm; Among them, the magnetic circuit system includes a first central hole penetrating along the vibration direction of the vibration system. The first diaphragm is an annular diaphragm. The outer side of the first diaphragm is fixed to the housing. The inner side of the first diaphragm is connected to the magnetic circuit system. And a second central hole communicating with the first central hole is provided on the inner side of the first diaphragm. The first central hole and the second central hole communicate to form a sound guiding channel. The outer side of the second diaphragm is fixed to the housing. The second diaphragm is disposed opposite to one side of the first central hole away from the second central hole.

[0006] Optionally, the voice coil includes a bobbin and a coil assembly wound around the outer peripheral side of the bobbin. First extension parts and second extension parts protruding from the coil assembly are provided at both ends of the bobbin. The first extension part is connected to the first diaphragm. The second extension part is connected to the second diaphragm. The coil assembly is disposed corresponding to the magnetic gap.

[0007] Optionally, a through hole is provided at one end of the bobbin close to the second diaphragm. The through hole communicates the internal sound cavity of the sound generating unit and the sound guiding channel.

[0008] Optionally, the magnetic circuit system includes a central magnetic circuit and a side magnetic circuit provided on the outer peripheral side of the central magnetic circuit. The central magnetic circuit and the side magnetic circuit are spaced apart to form the magnetic gap. The first central hole is provided in the central magnetic circuit. The side magnetic circuit is connected to the housing.

[0009] Optionally, along the vibration direction of the vibration system, the central magnetic part includes a first central magnet, a central magnetic conducting plate, and a second central magnet stacked in sequence. The side magnetic part includes a first side magnet, a side magnetic conducting plate, and a second side magnet stacked in sequence. Among them, the first central hole sequentially penetrates the first central magnet, the central magnetic conducting plate, and the second central magnet.

[0010] Optionally, a ring-shaped cover body is provided on one side of the first diaphragm away from the magnetic circuit system. A third central hole communicating with the second central hole is provided on the inner side of the cover body. The first central hole, the second central hole, and the third central hole together form the sound guiding channel.

[0011] Optionally, the first diaphragm includes a first folding ring part and a second folding ring part provided inside the first folding ring part. The sound generating unit further includes a first support ring. The first support ring is provided on one side of the housing close to the first diaphragm. The outer side of the first folding ring part is fixed to the first support ring; And / or, the sound generating unit further includes a second support ring. The second support ring is provided on one side of the magnetic circuit system close to the first diaphragm. The inner side of the second folding ring part is fixed to the second support ring.

[0012] Optionally, the sounding element further includes a third support ring disposed on a side of the housing close to the second diaphragm, and an outer peripheral side of the second diaphragm is fixed to the third support ring.

[0013] Optionally, the first diaphragm, the second diaphragm, the magnetic circuit system, and the housing cooperate together to define an internal sound cavity of the sounding element, and a leakage hole communicating with the internal sound cavity is provided on a side wall of the housing.

[0014] The beneficial effects of the present invention are as follows: The sounding element of the present invention includes a housing, a magnetic circuit system, and a vibration system. The vibration system includes a first diaphragm, a second diaphragm, and a voice coil. The magnetic circuit system is provided with a magnetic gap and a first central hole penetrating along a vibration direction of the vibration system. The first diaphragm is provided with a second central hole, and the first central hole and the second central hole communicate to form a sound guiding channel. By using one voice coil to synchronously drive two diaphragms, the structure of the sounding element can be simplified, and the occupied volume of the entire sounding element can be reduced. During operation, the two diaphragms vibrate in the same direction, and the sound wave generated by the vibration of the second diaphragm is transmitted to the position of the first diaphragm through the sound guiding channel and superimposed on the sound wave generated by the vibration of the first diaphragm, realizing the superimposition of the double-sided performance of the vibration system and improving the overall performance.

[0015] The sounding module of the second technical solution of the present invention includes a module housing and the sounding element of the first technical solution of the present invention. A module sound hole is provided on the module housing, and the sound guiding channel communicates with the module sound hole.

[0016] The electronic device of the third technical solution of the present invention includes the sounding element of the first technical solution of the present invention; or includes the sounding module of the second technical solution of the present invention.

[0017] Both the sounding module and the electronic device of the present invention include the above-mentioned sounding element. Since a sound guiding channel communicating the first diaphragm and the second diaphragm is provided in the sounding element, the vibration of the two diaphragms realizes the superimposition of double-sided sound waves at the first diaphragm. In view of this, the sounding performance of the sounding module and the electronic device including this sounding element has been significantly improved; since the sounding element uses one voice coil to connect two diaphragms, the structure is simpler, and the volume of the sounding element can be effectively reduced, thereby reducing the occupied volume of the entire sounding element in the whole machine. Description of the Drawings

[0018] The following drawings are only intended to illustrate and explain the present invention schematically and do not limit the scope of the present invention. Among them: Figure 1 is a cross-section of the sounding element of an embodiment of the present invention Figure 1 ; Figure 2Cross-section of a sounding element according to an embodiment of the present invention Figure 2 ; Figure 3 External structure diagram of a sounding element according to an embodiment of the present invention; Figure 4 Exploded view of a sounding element according to an embodiment of the present invention; Figure 5 Cross-sectional view of a sounding module according to an embodiment of the present invention; Figure 6 External structure of a sounding module according to an embodiment of the present invention Figure 1 ; Figure 7 External structure of a sounding module according to an embodiment of the present invention Figure 2 ; In the figure: 1 - housing; 21 - first diaphragm; 211 - first folding ring portion; 212 - second folding ring portion; 22 - second diaphragm; 23 - second central hole; 24 - first central hole; 25 - cover body; 26 - third central hole; 31 - magnetic gap; 32 - skeleton; 33 - coil assembly; 34 - first extension portion; 35 - second extension portion; 36 - through hole; 41 - first central magnet; 42 - central magnetic conduction plate; 43 - second central magnet; 44 - first side magnet; 45 - side magnetic conduction plate; 46 - second side magnet; 51 - first support ring; 52 - second support ring; 53 - third support ring; 61 - internal sound cavity; 62 - leakage hole; 63 - dustproof net; 71 - module housing; 72 - module sound hole; 73 - rear leakage hole; 8 - sound guiding channel; 91 - first reinforcement portion; 92 - second reinforcement portion. Detailed implementation manners

[0019] The present invention will be further described below in conjunction with the accompanying drawings and embodiments. In the following detailed description, only some exemplary embodiments of the present invention are described by way of illustration. Undoubtedly, those of ordinary skill in the art can recognize that the described embodiments can be modified in various different ways without departing from the spirit and scope of the present invention. Therefore, the accompanying drawings and the description are illustrative in nature and are not used to limit the protection scope of the claims.

[0020] As Figures 1 to 4 shown, a sounding element includes: a housing 1; a magnetic circuit system, the magnetic circuit system is fixed to the housing 1, and the magnetic circuit system is provided with a magnetic gap 31; a vibration system, the vibration system includes a first diaphragm 21, a second diaphragm 22 and a voice coil, the first diaphragm 21 and the second diaphragm 22 are respectively arranged on opposite sides of the magnetic circuit system, the voice coil is inserted into the magnetic gap 31, and along the vibration direction of the vibration system, both ends of the voice coil are respectively connected to the first diaphragm 21 and the second diaphragm 22; Among them, the magnetic circuit system includes a first central hole 24 penetrating along the vibration direction of the vibration system. The first diaphragm 21 is an annular diaphragm. The outer side of the first diaphragm 21 is fixed to the housing 1. The inner side of the first diaphragm 21 is connected to the magnetic circuit system. And a second central hole 23 communicating with the first central hole 24 is provided on the inner side of the first diaphragm 21. The first central hole 24 and the second central hole 23 communicate to form a sound guiding channel 8. The outer side of the second diaphragm 22 is fixed to the housing 1. The second diaphragm 22 is disposed opposite to the side of the first central hole 24 away from the second central hole 23.

[0021] During operation, the voice coil drives the first diaphragm 21 and the second diaphragm 22 to vibrate synchronously. The sound waves generated by the vibration of the second diaphragm 22 are transmitted to the first diaphragm 21 through the sound guiding channel 8, and are superimposed on the sound waves generated by the first diaphragm 21, realizing the superimposition of double-sided performance and achieving the effect that the diaphragms on both sides of the magnetic circuit system emit sound on the same side of the magnetic circuit system; at the same time, one voice coil supports two diaphragms, with a compact structure, which can effectively reduce the occupied volume of the sound generating element.

[0022] According to some embodiments of the present invention, the voice coil includes a bobbin 32 and a coil assembly 33 wound around the outer peripheral side of the bobbin 32. First extension portions 34 and second extension portions 5 protruding from the coil assembly 33 are provided at both ends of the bobbin 32. The first extension portion 34 is connected to the first diaphragm 21, and the second extension portion 5 is connected to the second diaphragm 22. The coil assembly 33 is disposed corresponding to the magnetic gap 31.

[0023] The bobbin 32 of the voice coil is provided with two extension portions, which are respectively connected to the first diaphragm 21 and the second diaphragm 22. When the coil assembly 33 is energized, the bobbin 32 can drive the first diaphragm 21 and the second diaphragm 22 to work synchronously.

[0024] In some embodiments of the present invention, a through hole 36 is provided at one end of the bobbin 32 close to the second diaphragm 22. The through hole 36 communicates the internal sound cavity 61 of the sound generating element and the sound guiding channel 8.

[0025] Specifically, the through hole 36 is provided on the second extension portion 5. A plurality of the through holes 36 are provided on the second extension portion 5. The through holes 36 are circumferentially distributed on the second extension portion 5. The sound waves generated by the second diaphragm 22 can enter the sound guiding channel 8 through the through hole 36, and then be transmitted to the first diaphragm 21, and are superimposed on the sound waves generated by the vibration of the first diaphragm 21. The design of the through hole 36 can improve the transmission efficiency of the sound waves, improve the superimposition effect of the bilateral sound waves, and thus improve the overall performance of the sound generating element.

[0026] According to some embodiments of the present invention, the magnetic circuit system includes a central magnetic circuit and an edge magnetic circuit disposed on the outer peripheral side of the central magnetic circuit. The central magnetic circuit and the edge magnetic circuit are spaced apart to form the magnetic gap 31. The central magnetic circuit is provided with the first central hole 24, and the edge magnetic circuit is connected to the housing 1.

[0027] A first central hole 24 penetrating the magnetic circuit system is provided in the magnetic circuit system. As a part of the sound guiding channel 8, the first central hole 24 can smoothly transmit the sound wave generated by the vibration of the second diaphragm 22 to the first diaphragm 21, and superimpose it with the sound wave generated by the vibration of the first diaphragm 21, so as to realize the superimposition of the double-sided performance.

[0028] In some embodiments of the present invention, along the vibration direction of the vibration system, the central magnetic part includes a first central magnet 41, a central magnetic conduction plate 42, and a second central magnet 43 stacked in sequence. The edge magnetic part includes a first edge magnet 44, an edge magnetic conduction plate 45, and a second edge magnet 46 stacked in sequence. Wherein, the first central hole 24 sequentially penetrates the first central magnet 41, the central magnetic conduction plate 42, and the second central magnet 43.

[0029] Specifically, the first edge magnet 44 is annular and located outside the first central magnet 41. The edge magnetic conduction plate 45 is annular and located outside the central magnetic conduction plate 42. The second edge magnet 46 is annular and located outside the second central magnet 43. The central magnetic part and the edge magnetic part both form a pair of magnetic structures, which can increase the magnetic field strength of the magnetic circuit system. Thereby, the driving force of the voice coil acting on the first diaphragm 21 and the second diaphragm 22 can be increased, the amplitudes of the first diaphragm 21 and the second diaphragm 22 can be increased, and further the sound production effect of the sound generating element can be improved.

[0030] According to some embodiments of the present invention, a ring-shaped cover 25 is provided on the side of the first diaphragm 21 facing away from the magnetic circuit system. A third central hole 26 communicating with the second central hole 23 is provided on the inner side of the cover 25. The first central hole 24, the second central hole 23, and the third central hole 26 together form the sound guiding channel 8.

[0031] The cover 25 can protect the first diaphragm 21. The edge of the cover 25 is bonded to the first diaphragm 21, which can inhibit the asymmetric deformation during the vibration of the diaphragm, reduce the risk of fracture caused by material fatigue, and improve the overall structural rigidity. At the same time, a third central hole 26 communicating with the sound guiding channel 8 is provided in the center of the cover 25, which has the effect of transmitting sound waves.

[0032] According to some embodiments of the present invention, the first diaphragm 21 includes a first surround portion 211 and a second surround portion 212 disposed inside the first surround portion 211. The sounding element further includes a first support ring 51, and the first support ring 51 is disposed on a side of the housing 1 close to the first diaphragm 21, and the outside of the first surround portion 211 is fixed to the first support ring 51; And / or, the sounding element further includes a second support ring 2, and the second support ring 2 is disposed on a side of the magnetic circuit system close to the first diaphragm 21, and the inside of the second surround portion 212 is fixed to the second support ring 2.

[0033] The first support ring 51 and the second support ring 2 are respectively connected to the outer edge and the inner edge of the first diaphragm 21, and play a role in supporting and fixing both sides of the first diaphragm.

[0034] In a specific example of the present invention, the sounding element further includes a first reinforcing portion 91 disposed between the first surround portion 211 and the second surround portion 212 of the first diaphragm 21, and one end of the skeleton 32 is connected to the first reinforcing portion 91. And / or, the sounding element further includes a second reinforcing portion 92 disposed inside the second diaphragm 22, and the other end of the skeleton 32 is connected to the second reinforcing portion 92.

[0035] In some embodiments of the present invention, the sounding element further includes a third support ring 53, and the third support ring 53 is disposed on a side of the housing 1 close to the second diaphragm 22, and the outer peripheral side of the second diaphragm 22 is fixed to the third support ring 53.

[0036] The third support ring 53 is bonded between the housing 1 and the second diaphragm 22, and plays a role in supporting and fixing the second diaphragm 22.

[0037] According to some embodiments of the present invention, the first diaphragm 21, the second diaphragm 22, the magnetic circuit system and the housing 1 cooperate together to define an internal sound cavity 61 of the sounding element. A leakage hole 62 communicating with the internal sound cavity 61 is provided on the side wall of the housing 1; A dust-proof net 63 for preventing dust from entering the internal sound cavity 61 is installed at the open end of the leakage hole 62 connected to the outside.

[0038] The leakage hole 62 communicates the internal and external spaces of the sounding element, and can balance the instantaneous air pressure change generated during the vibration of the diaphragm, preventing the movement of the diaphragm from being blocked or the voice coil from shifting due to the pressure accumulation in the closed cavity, thereby reducing the non-linear distortion and protecting the voice coil structure. The air pressure balance can reduce the reverse resistance of the diaphragm during the large-amplitude vibration at low frequencies, improve the compliance of the reciprocating movement of the diaphragm, and improve the low-frequency response speed and sound pressure stability.

[0039] In summary, the present sounding element uses a voice coil to synchronously drive two diaphragms, which can simplify the structure of the sounding element and reduce the occupied volume of the entire sounding element. During operation, the two diaphragms vibrate in the same direction, and the sound waves generated by the vibration of the second diaphragm 22 are transmitted to the first diaphragm 21 through the sound guiding channel 8 and superimposed on the sound waves generated by the vibration of the first diaphragm 21, realizing the superimposition of the double-sided performance of the vibration system and improving the overall performance.

[0040] As Figures 5 to 7 shown, a sounding module includes a module housing 71 and the sounding element described in the first technical solution of the present invention. A module sound hole 72 is provided on the module housing 71, and the sound guiding channel 8 is communicated with the module sound hole 72. Specifically, the sounding opening end of the sound guiding channel 8 of the sounding element is disposed close to the module sound hole 72. The module sound hole 72 is used to conduct the sound transmitted by the sound guiding channel 8 to the outside to ensure the sounding effect.

[0041] In a specific example of the present invention, a rear leakage hole 73 is provided on a side of the module housing 71 away from the module sound hole 72. The rear leakage hole 73 communicates the internal and external spaces of the module housing 71, which can ensure the stable air pressure inside the housing 1 and ensure the working performance of the sounding element. The number of the rear leakage holes 73 can be set as required and can be one or more.

[0042] An electronic device includes the sounding element described in the first technical solution of the present invention or the sounding module described in the second technical solution of the present invention. Optionally, the electronic device can be a mobile phone, a watch, a PAD, a smart wearable device, etc.

[0043] The sounding module and the electronic device of the present invention both include the foregoing sounding element. Since a sound guiding channel 8 communicating the first diaphragm 21 and the second diaphragm 22 is provided inside the sounding element, the sound waves generated by the vibration of the two diaphragms are superimposed with double-sided performance at the first diaphragm 21. In view of this, the sounding performance of the sounding module and the electronic device including the sounding element is significantly improved. Since the sounding element uses a voice coil to synchronously drive two diaphragms, the structure of the sounding element can be simplified, and the volume of the sounding element can be effectively reduced, thereby reducing the occupied volume of the entire sounding element in the whole machine.

[0044] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments. The above embodiments and the descriptions in the specification only illustrate the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements all fall within the scope of the present invention claimed. The scope of protection claimed by the present invention is defined by the appended claims and their equivalents.

Claims

1. A sound-emitting unit, characterized in that: include: case; A magnetic circuit system, wherein the magnetic circuit system is fixed to the housing and is provided with a magnetic gap; A vibration system, the vibration system comprising a first diaphragm, a second diaphragm and a voice coil, the first diaphragm and the second diaphragm are respectively arranged on opposite sides of the magnetic circuit system, the voice coil is inserted in the magnetic gap, and along the vibration direction of the vibration system, two ends of the voice coil are respectively connected to the first diaphragm and the second diaphragm; Among them, the magnetic circuit system includes a first center hole arranged along the vibration direction of the vibration system, the first diaphragm is an annular diaphragm, the outer side of the first diaphragm is fixed to the shell, the inner side of the first diaphragm is connected to the magnetic circuit system, and the inner side of the first diaphragm is provided with a second center hole connected to the first center hole, the first center hole and the second center hole are connected to form a sound guiding channel, the outer side of the second diaphragm is fixed to the shell, and the second diaphragm is arranged opposite to the side of the first center hole facing away from the second center hole.

2. The sound-emitting unit according to claim 1, characterized in that: The voice coil includes a frame and a coil assembly wound around the outer circumference of the frame, and both ends of the frame are provided with a first extension portion and a second extension portion protruding from the coil assembly, the first extension portion is connected to the first diaphragm, and the second extension portion is connected to the second diaphragm, and the coil assembly is arranged corresponding to the magnetic gap.

3. The sound-emitting unit according to claim 2, characterized in that: A conducting hole is provided at one end of the skeleton close to the second diaphragm, and the conducting hole connects the internal sound cavity of the sound-emitting unit and the sound-conducting channel.

4. The sound-emitting unit according to claim 1, characterized in that: The magnetic circuit system includes a central magnetic circuit and a side magnetic circuit arranged on the outer peripheral side of the central magnetic circuit. The central magnetic circuit and the side magnetic circuit are spaced apart to form the magnetic gap. The central magnetic circuit is provided with the first center hole, and the side magnetic circuit is connected to the shell.

5. The sound-emitting unit according to claim 4, characterized in that: Along the vibration direction of the vibration system, the central magnetic part includes a first central magnet, a central magnetic conductive plate, and a second central magnet stacked in sequence, and the side magnetic part includes a first side magnet, a side magnetic conductive plate, and a second side magnet stacked in sequence, wherein the first central hole passes through the first central magnet, the central magnetic conductive plate, and the second central magnet in sequence.

6. The sound-emitting unit according to claim 1, characterized in that: An annular cover is provided on the side of the first diaphragm facing away from the magnetic circuit system, and a third center hole connected to the second center hole is provided on the inner side of the cover. The first center hole, the second center hole and the third center hole together form the sound guiding channel.

7. The sound-emitting unit according to claim 1, characterized in that: The first diaphragm includes a first folding ring portion and a second folding ring portion provided inside the first folding ring portion, the sound-emitting unit also includes a first supporting ring, the first supporting ring is provided on a side of the housing close to the first diaphragm, and the outer side of the first folding ring portion is fixed to the first supporting ring; And / or, the sound unit further includes a second support ring, the second support ring is arranged on a side of the magnetic circuit system close to the first diaphragm, and the inner side of the second folding ring portion is fixed to the second support ring.

8. The sound-emitting unit according to claim 1, characterized in that: The sound-emitting unit further includes a third supporting ring, which is disposed on a side of the shell close to the second diaphragm, and an outer peripheral side of the second diaphragm is fixed to the third supporting ring.

9. The sound-emitting unit according to any one of claims 1 to 8, characterized in that: The first diaphragm, the second diaphragm, the magnetic circuit system and the shell cooperate to define an internal sound cavity of the sound-emitting unit, and a leakage hole communicating with the internal sound cavity is provided on a side wall of the shell.

10. A sound module, characterized in that: It comprises a module shell and a sound-emitting unit according to any one of claims 1 to 9, wherein the module shell is provided with a module sound hole, and the sound-guiding channel is connected to the module sound hole.

11. An electronic device, characterized in that: A sound-emitting unit comprising any one of claims 1 to 9; Or, including the sound module described in claim 10.

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