Transmission device for a structure-borne sound transducer

Abstract

Transmission device (10) of a structure-borne sound transducer (20) comprising an excitation unit (22) and a receiving unit (24) for introducing vibrations into a surface body onto which the transmission device (10) can be applied and connected to it in terms of vibration technology, characterized in that the transmission device (10) is constructed in multiple parts and comprises at least one support element (26) and at least one stiffening element (28), wherein the support element (26) is detachably connected to the stiffening element (28).

Description

[0001] The invention relates to a transmission device for a structure-borne sound transducer according to the type specified in the preamble of claim 1. Furthermore, the invention relates to a structure-borne sound transducer according to the type specified in the preamble of claim 16 and a system for transmitting vibrations according to the type specified in the preamble of claim 22.

[0002] Structure-borne sound transducers are well known and typically comprise an excitation unit, or exciter, and a pickup unit, or snap ring, for the excitation unit. Exciters are spring-mass systems that convert electrical input signals into vibroacoustic waves. Applied to resonant objects, they create loudspeakers in the shape of the excited sound body, namely the resonant object. Exciters are suitable for music and speech reproduction. The exciter is detachably connected to the snap ring, allowing the exciter to be easily replaced. The snap ring transmits the vibrations from the exciter to the sound body without loss. The snap ring is usually glued or screwed to the sound body. This has the disadvantage that manufacturing is quite time-consuming and series production is more complicated.

[0003] DE 10 2019 211 778 B4 discloses a transmission device for a structure-borne sound transducer. The transmission device has a plurality of arms connected to a central region, with at least one arm being connected to the central region via a joint. The formation of flat arms is intended to achieve higher quality, in particular better sound, of the reproduced audio signals. The transmission device is made of a tensile-resistant material, in particular CFRP, i.e., carbon fiber-reinforced plastic, namely carbon. This material is very complex to manufacture and therefore very expensive. The number of arms increases the production effort and the associated costs. A large amount of material is required for the transmission device to achieve higher quality of the reproduced audio signals. A basic rigidity of the transmission device is a prerequisite for the high quality of the audio signals.

[0004] The invention is based on the object of developing a transmission device for a structure-borne sound transducer in such a way that expensive material and the associated production costs and effort can be saved, but at the same time a high quality of the reproduced audio signals is maintained.

[0005] According to a first aspect of the invention, the object is achieved by the characterizing features of claim 1 in conjunction with its preamble features.

[0006] The subclaims form advantageous developments of the invention.

[0007] The invention is based on the finding that a transmission device that is both stiff and inexpensive to produce can be created by means of a composite construction consisting of at least one stiffening element formed from a high-strength material and at least one simple, inexpensive to produce support element.

[0008] According to a first aspect of the invention, a transmission device of a structure-borne sound transducer comprising an excitation unit and a pickup unit is designed to introduce vibrations into a planar body. The transmission device can be applied to the planar body and connected to it for vibration transmission.

[0009] According to the invention, the transmission device is constructed in several parts and comprises at least one support element and at least one stiffening element. The support element is detachably connected to the stiffening element. Due to its high rigidity, the stiffening element has good vibration transmission properties, so that the transmission structure ensures the most distortion-free reproduction of audio signals.

[0010] Preferably, the stiffening element on one side and the support element on the other side are provided with different stiffnesses; in particular, the support element on one side and the stiffening element on the other side are made of different materials. The different stiffnesses allow different requirements to be placed on the components, so that the transmission device can be more easily adapted to the external requirements resulting from the excitation unit, the receiving unit, and the sheet-like body.

[0011] According to a further advantageous embodiment of the invention, the stiffening element is made of a high-strength material, in particular CFRP, i.e., carbon fiber-reinforced plastic, such as carbon. A high-strength material, in particular carbon, exhibits high stability and rigidity while maintaining low mass. This ensures good vibration transmission properties.

[0012] The carrier element is preferably made of plastic, in particular a polymer, preferably polyimide, particularly preferably polyetherimide, preferably produced by an injection molding process. Polyetherimides exhibit very high strength while being cost-effective to produce. This makes this material ideal for a carrier element.

[0013] Preferably, a central region is provided for receiving the receiving unit. The central region has at least one base area, which corresponds at least to the base area of ​​the receiving unit. The central region is designed for connection to the receiving unit, in particular for a positive and / or frictional and / or material-to-material, preferably adhesive connection. As a result, the base area of ​​the receiving unit is completely received by the base area of ​​the central region. The receiving unit can thus be easily and reliably connected to the central region or the transmission device.

[0014] According to a further advantageous embodiment of the invention, the central region has at least two arms. The arms are arranged on the circumference of the central region and extend radially away from the central region, in particular in a rail-like, strip-like, and / or elongated manner. The arms allow vibrations to be transmitted over a wide area from the excitation unit via the receiving unit and the transmission device to the flat body.

[0015] Preferably, the arms are arranged opposite each other around the circumference of the central region. A symmetrical arrangement of the arms facilitates the manufacture of the transmission device and its assembly on the surface body.

[0016] Preferably, the arms are arranged asymmetrically or at an angle to each other on the circumference of the central region, in particular at an angle between two arms of less than 180°.

[0017] By forming the arms at an angle to each other, both arms can exhibit different frequency responses.

[0018] According to a further advantageous embodiment of the invention, the arms have different lengths and / or widths. This results in different frequency responses, allowing the amplification of the audio signal to be better adjusted and thus improved overall.

[0019] Preferably, two arms are provided. The ratio of the length of the first arm to the length of the second arm is at least 1 to 1.15. Due to the different dimensions of the two arms, the first and second arms exhibit their own frequency response.

[0020] Preferably, the support element forms the central area with the arms. The stiffening element can be accommodated in either the central area or the arm area, or connected to the support element.

[0021] According to a further advantageous embodiment of the invention, the support element is provided with a groove into which the stiffening element is inserted at least partially, in particular completely. This ensures good vibration transmission within the base area of ​​the transmission device to the sheet-like body.

[0022] Preferably, the stiffening element is connected to the support element in a form-fitting, friction-fitting, and / or material-fitting manner. The stiffening element is thus connected to the support element simply and reliably. Relative movements of the stiffening element relative to the support element due to vibrations are kept to a minimum.

[0023] Preferably, the stiffening element extends over the entire length of the support element, particularly through the central area. This ensures that the stiffening element's excellent vibration transmission properties are utilized across the entire base area of ​​the transmission device.

[0024] According to a further advantageous embodiment of the invention, the central region and the receiving unit are formed integrally, in particular from the same material. This eliminates the need for a connection between the receiving unit and the transmission device, simplifying production and eliminating potential losses due to a faulty connection between the receiving unit and the transmission device. The receiving unit and the carrier element can be manufactured, for example, using an injection molding process.

[0025] A further aspect of the invention relates to a structure-borne sound transducer for introducing vibrations into a planar body, comprising an excitation unit, a receiving unit, and a transmission device. The excitation unit is detachably connected to the receiving unit, in particular by a form-fitting connection. The structure-borne sound transducer can be applied to the planar body and connected to it for vibrational purposes.

[0026] According to the invention, the transmission device is connected to the receiving unit and the sheet. The transmission device is designed in several parts and comprises a support element and a stiffening element. The support element is connected, in particular detachably, to the stiffening element. This ensures that the support element and the stiffening element can be designed differently, thus placing different material requirements on both components. This allows for reduced production costs and better adaptation of the transmission device to the sheet.

[0027] Preferably, the transmission device is designed as described above. This ensures that the transmission device has good vibration characteristics while simultaneously reducing production effort and costs.

[0028] According to a further advantageous embodiment of the invention, the excitation unit and the receiving unit are connected to each other by a bayonet lock. The bayonet lock enables simple and quick assembly. The bayonet connection ensures high mechanical strength. This also allows for repeated assembly, for example, in the event of wear of the excitation unit, simple and damage-free.

[0029] The excitation unit can be formed by an exciter.

[0030] Preferably, the receiving unit is connected to the transmission device via an adhesive bond. Adhesive bonding allows for an even distribution of forces across the entire adhesive surface.

[0031] Preferably, the receiving unit is designed as a snap ring. The snap ring is designed to enable a simple and low-loss connection to the excitation unit.

[0032] According to a further advantageous embodiment of the invention, the receiving unit is formed integrally with the transmission device, in particular with the carrier element. This eliminates the need for a connection between the receiving unit and the transmission device, simplifying production and eliminating potential losses due to a faulty connection between the receiving unit and the transmission device.

[0033] A further aspect of the invention relates to a system for transmitting vibrations from a structure-borne sound transducer to a planar body, comprising a structure-borne sound transducer and a planar body. The structure-borne sound transducer has a transmission device and an excitation unit that can be releasably connected to a receiving unit. The receiving unit is arranged in the transmission device, in particular formed of the same material as the latter, and the transmission device is connected to the planar body.

[0034] According to the invention, the transmission device comprises a support element and a stiffening element. The support element is detachably connected to the stiffening element. The support element is connected, in particular detachably, to the stiffening element. This ensures that the support element and the stiffening element can be designed differently, thus allowing different material requirements to be placed on both components. This allows for production costs to be saved and the transmission device to be better adapted to the sheet-like body.

[0035] Preferably, the transmission device is designed as described above. This ensures that the transmission device has good vibration characteristics while simultaneously reducing production effort and costs.

[0036] Preferably, the transmission device is bonded to the sheet. Bonding allows for an even distribution of the forces to be transmitted across the entire bonded surface. The vibrations are transmitted evenly across the bonded surface from the transmission device to the sheet.

[0037] According to a further advantageous embodiment of the invention, the transmission device is screwed to the surface body. This screw connection makes the connection between the transmission device and the surface body reversible. This allows the transmission device to be easily replaced, for example, in the event of wear.

[0038] The sheet-like body preferably corresponds to a component of a motor vehicle, in particular an automobile. Structure-borne sound transducers are preferably used in motor vehicles, in particular automobiles.

[0039] Further advantages, features and possible applications of the present invention will become apparent from the following description in conjunction with the embodiments shown in the drawings.

[0040] In the description, claims, and drawings, the terms and associated reference symbols used in the list of reference symbols below are used. In the drawings, the following definitions apply: Fig. 1 a perspective view obliquely from above of a structure-borne sound transducer according to the invention with transmission device; Fig. 2 a perspective view obliquely from above of the transmission device; Fig. 3 a perspective view obliquely from below of the transmission device; Fig. 4 is an exploded perspective view of the transmission device, and Fig. 5 a perspective view obliquely from above of a second embodiment of a transmission device with integrated receiving unit.

[0041] The Fig. 1 to 5 each show a transmission device 10 of a structure-borne sound transducer 20. The transmission device 10 has a central region 12, circular in plan view, with two arms 14a, 14b. The arms 14a, 14b are rail-shaped / strip-shaped. Each arm 14a, 14b is arranged with its inner end 14a1, 14b1 on the circumference of the central region 12 and connected thereto. The arms 14a, 14b each extend in different radial directions away from the central region 12. The radially outer ends 14a2, 14b2 extend transversely to the longitudinal extent of the arms 14a, 14b.

[0042] The transmission device 10 is firmly bonded, by its underside 11, to a flat body (not shown here). The flat body to be excited forms a resonant object and thus a loudspeaker for music and speech reproduction.

[0043] Fig. Figure 1 shows a structure-borne sound transducer 20 according to the invention. The structure-borne sound transducer 20 comprises an excitation unit, a pickup unit, and the transmission device 10. The structure-borne sound transducer 20 is connected to the flat body (not shown here) via the transmission device 10. The structure-borne sound transducer 20 has an exciter 22 as an excitation unit. The exciter 22 is detachably connected to the pickup unit, which is designed as a snap ring 24, via a bayonet lock. The snap ring 24, in turn, is glued to the transmission device 10 in the central region 12.

[0044] The base area of ​​the central region 12 extends beyond the base area of ​​the snap ring 24 and is provided with a web 12a laterally surrounding the central region 12, into which the snap ring 24 is inserted. In the inserted position of the snap ring 24, the web 12a rests against the outer surface of the snap ring 24. In addition, the web 12a is provided in the lower area with two curved shoulders 12b, which follow the course of the web 12a over 160° each, see Fig. 2. The shoulders 12b and the web 12a form the adhesive surfaces on the side facing the snap ring, via which the snap ring 24 is glued to the central area 12.

[0045] The exciter 22, the snap ring 24 and the transmission device 10 form the structure-borne sound transducer 20. A system 32 is formed by the structure-borne sound transducer 20 connected to the surface body.

[0046] The two arms 14a and 14b are arranged asymmetrically on the central region 12 at an angle a that spans an angle of 160°, extending counterclockwise from the first arm 14a to the second arm 14b. The arms 14a and 14b thus each lie in a semicircular section of the circular central region 12 and are of different lengths. The width of the arms 14a, 14b remains the same throughout their length. The ratio of the length of the first arm 14a to the length of the second arm 14b is 1 to 1.15.

[0047] The Fig. Figure 2 shows a perspective view of the transmission device 10, obliquely from above, without the snap ring 24 and exciter 22. The central region 12 has a circular base. The two arms 14a, 14b are arranged on the circumference of the central region 12. The arms 14a, 14b are rail-shaped / strip-shaped.

[0048] In the Fig. 3 shows a perspective view obliquely from below of the transmission device 10.

[0049] The transmission device 10 is constructed in several parts and comprises a support element 26 and a stiffening element 28. The support element 26 is detachably connected to the stiffening element 28. For this purpose, the support element 26 has a groove 30 into which the stiffening element 28 is inserted such that the edge of the groove 30 and the inserted stiffening element 28 form a surface with one another. Alternatively, the stiffening element 28 protrudes slightly from the groove 30. The support element 26 is connected to the stiffening element 28 by an adhesive bond. The stiffening element 28 runs in the region of the arms 14a, 14b and in the central region 12, with the stiffening element 28 extending through the central region 12. The length of the stiffening element 28 and the support element 26 are the same. Both elements 26, 28 are flush at the radially outer ends 14a2, 14b2.

[0050] The support element 26 and the stiffening element 28 are made of different materials with different stiffnesses, with the stiffening element 28 being provided with a higher stiffness than the support element 26. The support element 26 is made of the plastic polyetherimide. The stiffening element 28 is made of carbon fiber-reinforced plastic, namely carbon.

[0051] The underside 11 of the transmission device 10 is bonded to the sheet. As a result, the stiffening element 28 is fully bonded to the sheet, and the support element 26 is partially bonded to the sheet, either directly or indirectly, through the bonding.

[0052] In the Fig. Figure 4 shows a perspective exploded view of the transmission device 10, taken obliquely from below. The stiffening element 28 is not inserted into the groove 30 of the support element 26.

[0053] The Fig.Figure 5 shows a perspective view obliquely from above of a second embodiment of the transmission device 10 with a receiving unit. The receiving unit is designed as a snap ring 24. The carrier element 26 is formed integrally and of the same material as the snap ring 24, in particular as a single component manufactured using an injection molding process.

[0054] The sheet-like body to which the transmission device 10 is applied or to which the transmission device 10 is connected is a component of an automobile.

[0055] The design of the transmission device 10 makes it possible to ensure a high quality of audio reproduction and at the same time saves expensive material through the multi-part design of the transmission device 10 with support element 26 and stiffening element 28. List of reference symbols 10 Transmission device 11 Bottom of the transmission device 10 12 Central area 12a lateral, circular bridge of the central area 12 12b arched ledge of the central area12 14a first arm 14a1 radially inner end of the first arm 14a 14a2 radially outer end of the first arm 14a 14b second arm 14b1 radially inner end of the second arm 14b 14b2 radially outer end of the second arm 14b 20 structure-borne sound transducers 22 Exciters 24 Snapring (receiving unit) 26 support element 28 stiffening element 30 grooves 32 systems QUOTES CONTAINED IN THE DESCRIPTION

[0000] This list of documents submitted by the applicant was generated automatically and is included solely for the convenience of the reader. This list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions. Cited patent literature

[0000] DE 10 2019 211 778 B4

[0003]

Claims

[1] Transmission device (10) of a structure-borne sound transducer (20) having an excitation unit (22) and a recording unit (24) for introducing vibrations into a planar body to which the transmission device (10) can be applied and connected to it in terms of vibration technology, characterized by that the transmission device (10) is constructed in several parts and has at least one support element (26) and at least one stiffening element (28), wherein the support element (26) is detachably connected to the stiffening element (28). [2] Transmission device according to claim 1, characterized by that the stiffening element (28) on one side and the support element (26) on the other side are provided with different stiffnesses, in particular the support element (26) on one side and the stiffening element (28) on the other side are formed from different materials. [3] Transmission device according to claim 2, characterized by that the stiffening element (28) is made of high-strength material, in particular CFRP, i.e. carbon fiber reinforced plastic, such as carbon. [4] Transmission device according to claim 2 or 3, characterized by that the carrier element (26) is made of plastic, in particular of a polymer, preferably a polyimide, particularly preferably of polyetherimide, preferably produced by an injection molding process. [5] Transmission device according to one of the preceding claims, characterized by a central region (12) for receiving the receiving unit (24), the central region (12) has at least one base area which corresponds at least to the base area of ​​the receiving unit (24), and the central region (12) is designed for connection to the receiving unit (24), in particular for a positive and / or frictional and / or material-locking, preferably adhesively bonded connection. [6] Transmission device according to claim 5, characterized by that the central region (12) has at least two arms (14a, 14b), wherein the arms (14a, 14b) are arranged on the circumference of the central region (12) and extend in radial directions, in particular in a rail-like, strip-like and / or elongated manner from the central region (12). [7] Transmission device according to claim 6, characterized by that the arms (14a, 14b) are arranged opposite one another on the circumference of the central region (12). [8] Transmission device according to claim 6, characterized by that the arms (14a, 14b) are arranged asymmetrically or at an angle to one another on the circumference of the central region (12), in particular at an angle between two arms (14a, 14b) of less than 180°. [9] Transmission device according to one of claims 6 to 8, characterized by that the arms (14a, 14b) have different lengths and / or widths. [10] Transmission device according to claim 9, characterized by that two arms (14a, 14b) are provided, the ratio of the length of the first arm (14a) to the length of the second arm (14b) being at least 1 to 1.

15. [11] Transmission device according to one of the preceding claims, characterized by that the support element (26) forms the central region (12) with the arms (14a, 14b). [12] Transmission device according to one of the preceding claims, characterized by that the support element (26) is provided with a groove (30) into which the stiffening element (28) is inserted at least in part, in particular completely. [13] Transmission device according to one of the preceding claims, characterized by that the stiffening element (28) is connected to the support element (26) in a form-fitting, friction-fitting and / or material-fitting manner. [14] Transmission device according to one of the preceding claims, characterized bythat the stiffening element (28) extends in the support element (26) over the entire length of the support element (26), in particular also extends through the central region (12). [15] Transmission device according to one of the preceding claims, characterized by that the central region (12) and the receiving unit (24) are formed in one piece, in particular from the same material. [16] Structure-borne sound transducer (20) for introducing vibrations into a planar body, comprising an excitation unit (22), a receiving unit (24) and a transmission device (10), wherein the excitation unit (22) is detachably connected, in particular positively, to the receiving unit (24), wherein the structure-borne sound transducer (20) can be applied to the planar body and can be connected to it in terms of vibration technology, characterized bythat the transmission device (10) is connected to the receiving unit (24) and the sheet-like body, the transmission device (10) is designed in several parts and has a carrier element (26) and a stiffening element (28), wherein the carrier element (26) is connected, in particular detachably, to the stiffening element (28). [17] Structure-borne sound transducer according to claim 16, characterized by the transmission device (10) according to one of claims 1 to 15. [18] Structure-borne sound transducer according to one of claims 16 or 17, characterized by that the excitation unit (22) and the recording unit (24) are connected to each other by a bayonet lock. [19] Structure-borne sound transducer according to one of claims 16 to 18, characterized by that the receiving unit (24) is connected to the transmission device (10) by means of an adhesive. [20] Structure-borne sound transducer according to one of claims 16 to 19, characterized bythat the receiving unit (24) is designed as a snap ring which is designed in such a way that a simple and low-loss connection to the excitation unit (22) is possible. [21] Structure-borne sound transducer according to one of claims 16 to 20, characterized by that the receiving unit (24) is formed in one piece with the transmission device (10), in particular with the carrier element (26). [22] System (32) for transmitting vibrations from a structure-borne sound transducer (20) to a planar body, comprising a structure-borne sound transducer (20) and a planar body, wherein the structure-borne sound transducer (20) has a transmission device (10) and an excitation unit (22) detachably connectable to a receiving unit (24), wherein the receiving unit (24) is arranged in the transmission device (10) and the transmission device (10) is connected to the planar body, characterized bythat the transmission device (10) has a support element (26) and a stiffening element (28), wherein the support element (26) is detachably connected to the stiffening element (28). [23] System according to claim 22, characterized by that the transmission device (10) is designed according to one of claims 1 to 15. [24] System according to one of the preceding claims, characterized by that the transmission device (10) is glued to the surface body. [25] System according to one of the preceding claims, characterized by that the transmission device (10) is screwed to the surface body. [26] System according to one of claims 22 to 25, characterized by that the surface corresponds to a component of a motor vehicle, in particular an automobile.

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