Chair comprising low-frequency speakers

Abstract

A chair includes: a seating area and a backrest, wherein the seating area is arranged at a lower end of the backrest; a low frequency speaker configured to emit sound at a frequency between 20 Hz and 200 Hz; and a coupling mechanism, where the coupling mechanism is configured to change between at least two different states, where in a first state, the low frequency speaker is coupled to the chair via at least one acoustic path such that vibrations are transmitted from the low frequency speaker to the chair via each of the at least one acoustic path, and where in a second state, the low frequency speaker is coupled to the chair via each of the at least one acoustic path. Wherein the vibration is perceivable as haptic feedback by a user seated on the chair, and in a second state each of the at least one acoustic path is interrupted such that no or almost no vibration is transmitted from the low frequency speaker to the chair so as not to be perceivable as haptic feedback by the user seated on the chair.

Description

Technical Field

[0001] The present disclosure relates to a chair including a low frequency speaker. Background Art

[0002] The integration of loudspeakers in listening environments, such as in vehicles, can be challenging. Many different aspects and constraints must be considered when integrating loudspeakers into a listening environment. During use of the loudspeaker, the loudspeaker may cause other elements to vibrate, thereby generating unwanted noise that can adversely affect the listening experience of people present in the listening environment. Furthermore, if the loudspeaker is located in an unfavorable position, the acoustic performance of the loudspeaker may be affected. Loudspeakers may also be used to provide structure-borne sound to the user, however, this structure-borne sound may be perceived as unpleasant by some users, particularly if the loudspeaker is not adequately tuned.

[0003] There is a need for a chair that includes a low frequency speaker that is easy to integrate and provides a satisfying listening experience. Summary of the invention

[0004] A chair comprises: a seating area and a backrest, wherein the seating area is arranged at a lower end of the backrest; a low-frequency speaker, the low-frequency speaker being configured to emit sound at a frequency between 20 Hz and 200 Hz; and a connecting mechanism, wherein the connecting mechanism is configured to change between at least two different states, wherein in a first state, the low-frequency speaker is connected to the chair via at least one acoustic path, so that vibration is transmitted from the low-frequency speaker to the chair via each of the at least one acoustic path, wherein the vibration can be perceived as tactile feedback by a user sitting on the chair, and in a second state, each of the at least one acoustic path is interrupted, so that no or almost no vibration is transmitted from the low-frequency speaker to the chair, and thus cannot be perceived as tactile feedback by a user sitting on the chair.

[0005] Other systems, features and advantages of the present disclosure will be or will become apparent to those skilled in the art upon studying the following detailed description and accompanying drawings. It is intended that all such additional systems, methods, features and advantages are included in this description, are within the scope of the present invention, and are protected by the appended claims. BRIEF DESCRIPTION OF THE DRAWINGS

[0006] The arrangement may be better understood with reference to the following description and accompanying drawings. The components in the accompanying drawings are not necessarily drawn to scale, but emphasis is placed on illustrating the principles of the present invention. In addition, in the accompanying drawings, the same reference numerals indicate corresponding parts throughout the different views.

[0007] Figure 1 A three-dimensional view of a chair and a low frequency speaker is schematically shown.

[0008] Figure 2 A top view of a vehicle according to an embodiment of the present disclosure is schematically shown.

[0009] Figure 3A and Figure 3B Schematically shown is a cross-sectional view of a chair and a low frequency speaker according to an embodiment of the present disclosure.

[0010] Figure 4 A three-dimensional view of a low frequency speaker coupled to a chair is schematically shown.

[0011] Figure 5A and Figure 5B Schematically shows a device that can be connected to a chair ( Figure 5A ) or separated from the chair ( Figure 5B ) is a front view of a low frequency speaker.

[0012] FIG. 6A to FIG. 6C A side view of a low frequency speaker coupled to a chair is schematically shown.

[0013] include 7A to 7C A side view of a low frequency speaker separated from a chair is schematically shown.

[0014] Figure 8 A low frequency speaker mounted to the frame of a chair is shown schematically.

[0015] Fig.9A and Fig. 9B Schematically shows the connection with the chair ( Fig.9A ) or separated from the chair ( Fig. 9B ) 3D view of the low frequency speaker.

[0016] Fig. 10A and Fig. 10B Schematically illustrates a method for connecting a low frequency speaker to a chair ( Fig. 10A ) or separate the low frequency speaker from the chair ( Fig. 10B ) connection device. DETAILED DESCRIPTION

[0017] The speaker, when coupled to the chair, provides air-conducted sound audible to a user in the vicinity of the speaker. During use of the speaker, the speaker vibrates, and the vibrations of the speaker may be transmitted via components of the chair so that they may be perceived as tactile feedback by a user seated on the chair. While some people like to receive (strong) tactile feedback, others prefer a listening experience without tactile feedback or with relatively mild tactile feedback. Therefore, according to an embodiment of the present disclosure, a speaker in a first state may be coupled to a chair so that it provides tactile feedback to a user seated on the chair. In a second state, the speaker may be detached from the chair so as not to provide tactile feedback.

[0018] Figure 1 The chair 220 is schematically shown and includes a seating area 2204 and a backrest 2202. The seating area 2204 is arranged at the lower end of the backrest 2202. The lower end of the backrest 2202 is generally the end facing the ground (i.e., facing the ground on which the chair is arranged). The chair 220 also includes a low-frequency speaker 30, which is configured to emit sound at a frequency between 20 Hz and 200 Hz. Figure 1 The low frequency speaker 30 in the example shown in FIG is arranged in the backrest 2202, specifically, on the back of the backrest 2202 facing away from the seating area 2204, and is therefore configured to emit sound mainly in the direction facing away from the seating area 2204 (the main direction of sound propagation). That is, the low frequency speaker 30 (e.g., the sound radiation surface of the low frequency speaker 30) is directed to one or more back seats arranged behind the corresponding chair 220. For example, positioning the low frequency speaker 30 in the backrest 2202 of the chair 220 so that it is away from the seating area 2204 of the chair 220 in which it is installed generally produces optimized low frequency output (SPL), bandwidth and positioning. For example, with the help of (customized) damping mounting or balanced woofer configuration (described in more detail below), the vibration (tactile feedback) of the low frequency speaker 30 in this position can be further optimized. However, arranging the low frequency speaker 30 in the backrest 2202 of the chair 220 is only an example. Generally, the low frequency speaker 30 can be arranged in or attached to any other position on the chair 220. According to other examples, the low frequency speaker 30 is arranged in the seating area 2204, or alternatively in the headrest of the chair 220.

[0019] The low frequency speaker 30 may be mechanically coupled to the chair 220 so that the occupant user 24 seated on the chair 220 senses the vibrations generated by the low frequency speaker 30. This effect is also used in, for example, movie theaters to enhance the perception of sound (so-called vibration effect), and may also be referred to as structure-conducted sound. The occupant 24 seated on the chair 220 may be fully immersed in the sound (bass) generated by the low frequency speaker 30, so that the sound experience may be enhanced. However, this tactile feedback is often unpleasant to some people. Others may only like to sense tactile feedback occasionally, rather than all the time. Further, some people prefer strong tactile feedback, while others prefer relatively mild tactile feedback. Therefore, according to an embodiment of the present disclosure, the speaker 30 in a first state may be coupled to the chair 220 so that it provides tactile feedback to the user seated on the chair 220. In a second state, the speaker 30 may be separated from the chair 220 so as not to provide tactile feedback. It is generally possible that in the third or any further state, the speaker 30 is only partially separated from the chair 220 to provide only relatively mild tactile feedback compared to the first state.

[0020] The chair 220 may be a car seat, for example, a driver's seat or a front passenger seat. Figure 2 Specifically, Figure 2 A top view of a vehicle 10 is schematically shown. The vehicle 10 includes a chair (car seat) 220 (e.g., a driver's seat). A low-frequency speaker 30 is arranged in a backrest of the car seat 220. The low-frequency speaker 30 is configured to emit sound at a frequency between 20 Hz and 200 Hz. The low-frequency speaker 30 is arranged on the back of the car seat 220. That is, the sound radiation surface of the low-frequency speaker 30 may be directed toward the rear of the vehicle 10. In other words, the main direction of sound propagation may be directed toward the rear of the vehicle 10 (with the aid of the low-frequency speaker 30). Figure 1 ). However, low-frequency sound waves (air-conducted sound) generally propagate in all directions (spherical waves). Placing the low-frequency speaker 30 in this position in the car seat 220, 222 can produce a very pleasant listening experience for the user sitting on the car seat 220, 222. However, as described above, the low-frequency speaker 30 can alternatively be arranged on the car seat 220, 222 or in any other position in the car seat. According to other examples, the chair 220 is a gaming chair or a chair in a movie theater. That is, the chair 220 can generally be any type of chair and can be arranged in any type of listening environment.

[0021] According to one example, in the first state, tactile feedback is provided to the user 24 seated on the chair 220 via the first acoustic path and via the second acoustic path. In the second state, both the first acoustic path and the second acoustic path are interrupted so that no tactile feedback is provided. For example, in the third state (intermediate state), tactile feedback is provided via the first acoustic path or via the second acoustic path, but not via both. That is, in the third state, relatively mild tactile feedback can be provided. Different examples of acoustic paths and different ways of interrupting acoustic paths will be exemplarily described below. However, in general, acoustic paths can be formed and interrupted in any suitable manner. By providing or interrupting one or more acoustic paths, a personally satisfying listening experience can be provided to the user 24 seated on the chair 220.

[0022] Reference now Figure 3A and 3B The chair 220 includes a seating area 2204 and a backrest 2202, wherein the seating area 2204 is arranged at the lower end of the backrest 2202. The low-frequency speaker 30 is arranged in the chair 220 and is configured to emit sound at a frequency between 20 Hz and 200 Hz. The chair 220 also includes a coupling mechanism 40, which is configured to change (switch or attenuate) between at least two different states, wherein in the first state ( Figure 3A ), the low frequency speaker 30 is coupled to the chair 220 via at least one acoustic path, so that vibrations are transmitted from the low frequency speaker 30 to the chair 220 via each of the at least one acoustic path, wherein the vibrations are perceptible as tactile feedback (tactile feedback indicated by arrows) by an occupant user seated on the chair 220, and in the second state ( Figure 3B ), each of the at least one acoustic path is interrupted so that no or almost no vibration is transmitted from the low frequency speaker 30 to the chair 220, and thus cannot be perceived as tactile feedback by a user sitting on the chair 220.

[0023] When the low frequency speaker 30 is coupled to the chair 220 and vibrations are transmitted from the low frequency speaker 30 to the chair 220 (i.e., the backrest 2202 and / or the seating area 2204), a fully balanced structure-conducted sound is provided in a controlled manner to an occupant seated on the chair 220. The chair 220 may include a frame 2210, for example, a metal frame, covered with foam, cushions, or upholstery. The frame 2210 and the upholstery typically define the seating area 2204 and the backrest 2202 of the chair 220. For example, the upholstery may also be covered with a layer of fabric. If the chair 220 is a car seat, various components (such as, for example, a seat belt receiver, a reclining mechanism, etc.) may be mounted to the frame 2210.

[0024] like Figure 42, the speaker 30 can be mounted on the frame 2210 of the chair 220 by means of bearings 2212. The frame 2210 may include, for example, backrest side members arranged along the sides (left and right) of the backrest 2202. The speaker 30 can be mounted on such backrest side members by means of bearings 2212, for example. Figure 8 The speaker 30 is further schematically shown mounted to the frame 2210 of the chair 220 by means of bearings 2212. Figure 8 The "bare" frame of the chair with the loudspeaker 30 mounted is shown schematically. For greater clarity, Figure 8 Any cushion or upholstery is omitted. The speaker 30 can be mounted to any other part of the frame 2210, rather than being mounted to the backrest side member. For example, the speaker 30 can also be mounted to the portion of the frame 2210 that defines the seating area 2204.

[0025] In the first state, the bearing 2212 provides a first acoustic path between the low frequency speaker 30 and the chair 220. Via this first acoustic path, the vibrations of the low frequency speaker 30 are transmitted to the frame 2210. A user seated on the chair 220 perceives such vibrations as structure-conducted sound (tactile feedback). The structure-conducted sound coupled into the chair via the substantially rigid (metal) frame 2210 achieves relatively high bass frequencies (e.g., >50 Hz or >100 Hz) and increases control over the bass perceived subjectively by the occupant.

[0026] However, structure-conducted sound transmitted to the chair 220 only via the bearing 2212 and the frame 2210 may be unpleasant to an occupant user seated on the chair 220. For this reason, a second acoustic path may be provided for the structure-conducted sound. Specifically, at least the back side of the low frequency speaker 30 may be directly or indirectly adjacent to the interior of the chair 220. The back side of the low frequency speaker 30 is the side facing the interior of the chair 220. That is, when the low frequency speaker 30 vibrates during its use, the vibration may be transmitted to the frame 2210 of the chair 220 via the bearing 2212, and further directly transmitted from the low frequency speaker 30 to the interior. Although the frame 2210 is generally a rigid component, the interior is composed of or includes foam or other relatively soft materials. Therefore, very obvious low-end (e.g., <50Hz or <40Hz) structure-conducted sound can be provided via the second acoustic path. For an occupant user seated on the chair 220, providing structure-conducted sound only via the second acoustic path may feel uncontrolled, weak or "down-tuned". Combining the first coupling impedance of the first acoustic path with the second coupling impedance of the second acoustic path can produce a very pleasant experience for the user sitting on the chair 220. By balancing the first coupling impedance of the first acoustic path and the second coupling impedance of the second acoustic path in an appropriate manner, the tactile feedback (structure-conducted sound) can be adjusted in a very pleasant manner. The low end (e.g., <50 Hz) and the higher bass range (e.g., >50 Hz or >100 Hz) are well balanced, and the bass control is optimized, which feels very pleasant to the occupant user sitting on the chair 220. However, combining the above-mentioned first acoustic path with the second acoustic path is only an example. In the first state, only the first acoustic path or only the second acoustic path may also be provided. In addition or alternatively, other acoustic paths may be provided. An acoustic path from the low frequency speaker 30 to the area of ​​the backrest 2202 (as described above) and / or to any other area of ​​the chair 220 may be provided. For example, the tactile feedback may be clearly perceived in the seating area 2204 (the acoustic path provided by the elements from the speaker 30 to the seating area 2204).

[0027] The low frequency speaker 30 may include a speaker housing. The speaker housing may be easily integrated into the chair 220 (e.g., the backrest 2202) and mounted to the frame 2210 of the chair 220 via a bearing 2212. The bearing 2212 may allow the speaker 30 to move in a horizontal direction z, where the horizontal direction z is a direction parallel to the top surface of the seating area 2204. According to one example and as shown in FIG. Figure 5A-5BAs schematically shown in FIG. 2 , the bearing 2212 may include a first bearing member including a first bolt 2216 and a first guide rail 2214, and a second bearing member including a second bolt 2216 and a second guide rail 2214. The first guide rail 2214 may include a counterpart of the first bolt 2216, and the first bolt 2216 may be inserted into the counterpart. Figure 5A-5B In the example shown in , the first bolt 2216 includes a rigid first section 2216a and a flexible second section 2216b. The rigid first section 2216a may include or be composed of metal or any other rigid material that is not easily deformed or vibrated, for example. The flexible second section 2216b may include or be composed of, for example, rubber or any other relatively flexible material that is sufficiently rigid to hold the low frequency speaker 30 in a desired position while being flexible enough to move and vibrate to a certain extent when the low frequency speaker 30 vibrates.

[0028] In the first state, the rigid first section 2216a is inserted into the counterpart so that the first guide rail 2214 is rigidly attached to the first bolt 2216 or can pivot about the first bolt ( Figure 5A ), while in the second state, only the flexible second section 2216b is inserted into the counterpart ( Figure 5B ), while the rigid first section 2216a is completely arranged outside the counterpart. The rigid first section 2216a of the bolt 2216 may be attached to the frame 2210, and the flexible second section 2216b may be attached to the rigid first section 2216a, so that the rigid first section 2216a is arranged between the flexible second section 2216b and the frame 2210. In this way, when the rigid first section 2216a is inserted into the counterpart provided by the first guide rail 2214 (a first state), vibration is transmitted from the low frequency speaker 30 to the rigid first section 2216a via the first guide rail 2214, and from the rigid first section to the frame 2210. In the second state, when only the flexible second section 2216b, not the rigid first section 2216a, is inserted into the counterpart provided by the first guide rail 2214, vibration is transmitted from the low frequency speaker 30 to the flexible second section 2216b via the first guide rail 2214. However, the flexible second section 2216b itself will begin to vibrate, and no vibration or only a small amount of vibration will be transmitted from the flexible second section 2216b to the rigid first section 2216a.

[0029] The first rail 2214 can be movably attached to the housing of the low frequency speaker 30. Specifically, the first rail 2214 can be moved from a first position to a second position, and vice versa. In the first position, the first rail 2214 is arranged closer to the frame 2210 so that the rigid first section 2216a of the bolt 2216 is inserted into the counterpart provided by the first rail 2216. Figure 5AAs shown in , in the first state, the flexible second segment 2216b can also be inserted into the counterpart. However, due to the direct connection between the first rail 2214 and the rigid first segment 2216a, the vibration is transmitted to the frame 2210 as described above. In the second position, the distance d1 between the first rail 2214 and the frame 2210 is increased, so that only the flexible second segment 2216b, not the rigid first segment 2216a, is inserted into the counterpart provided by the first rail 2214. The first rail 2214 can be moved from the first position to the second position, and vice versa, by any suitable mechanism.

[0030] The first bolt 2216 may generally have a circular shape, for example, having a first diameter, and the first counterpart may be a sleeve or recess also having a circular shape. The diameter of the sleeve or recess may be equal to or slightly larger than the first diameter of the first bolt 2216. For example, "slightly larger" herein means a difference of between 0 and 0.5 mm (millimeter). The description of the first rail 2214 and the first bolt 2216 also applies to the second rail 2214 and the second bolt 2216.

[0031] The first rail 2214 may be attached to the speaker housing and extend from the speaker housing toward a first side (e.g., right side), and the second rail 2214 may be attached to the speaker housing and extend from the speaker housing toward a second side (e.g., left side) opposite to the first side. The first rail and the second rail 2214 may be attached to an upper side of the speaker housing, wherein the upper side is a side facing an upper end of the backrest 2202 (opposite to a lower end of the backrest 2202) and faces a headrest of the chair 220. In other words, when the speaker 30 is mounted to the chair 220 and the chair 220 is arranged in the vehicle 10, the speaker 30 may be arranged between the first rail and the second rail 2214 and a road on which the vehicle 10 travels.

[0032] The speaker housing may include an opening, wherein the speaker is mounted in the opening such that a first side of the sound radiation surface faces the interior of the housing, and a second side of the sound radiation surface faces the exterior of the housing and faces the rear of the vehicle 10. The low frequency speaker 30 may be centrally arranged in the chair 220 in the horizontal direction x, wherein the horizontal direction x is a direction perpendicular to the horizontal direction z and parallel to the top surface of the seating area 2204, wherein the top surface of the seating area 2204 is a surface on which a user may sit. In other words, the distance between the low frequency speaker 30 and the right side of the chair 220 may be equal to the distance between the low frequency speaker 30 and the left side of the chair 220. In this way, vibrations may be transmitted from the low frequency speaker 30 to the frame 2210 in a symmetrical manner, thereby making the occupant user seated on the chair 220 feel very pleasant.

[0033] As described above, at least the back side of the low frequency speaker 30 may directly or indirectly abut the interior of the chair 220. According to one example, the contact layer 2220 is disposed between the back side of the low frequency speaker 30 and the interior. In a first state, the contact layer 2220 directly abuts the low frequency speaker 30 and the interior, so that when the low frequency speaker 30 vibrates, the contact layer 2220 transmits the vibration from the low frequency speaker 30 to the interior. For example, Figure 4 and Figures 6A-6C A contact layer 2220 is schematically shown. For example, the contact layer 2220 can consist of a material that is different from the material of the interior. In this way, the second acoustic path can be adjusted and the structure-conducted sound can be transmitted to the interior in a balanced and controlled manner. For example, such a contact layer 2220 can be bonded to the surface of the interior facing the low-frequency speaker 30. However, the contact layer 2220 can also be maintained in its desired position between the low-frequency speaker 30 and the interior in any other suitable way. In a first state, for example, the contact layer 2220 can be arranged between the low-frequency speaker 30 and the interior in order to eliminate a gap between the low-frequency speaker 30 and the interior. The contact layer 2220 and the interior can be soft, so that the low-frequency speaker 30 can be pressed into the contact layer 2220 when vibrating (the low-frequency speaker 30 is indirectly adjacent to the interior) or to a certain extent into the interior (the low-frequency speaker 30 is directly adjacent to the interior). For example, this Fig. 6A , Figure 6B and Figure 6C It is schematically shown in Fig. 6A The low frequency loudspeaker 30 is shown in a rest position (no vibration), while Figure 6B and Figure 6C The low frequency speaker 30 is schematically shown vibrating back and forth (pivoting slightly about bolt 2216). Fig. 6A , Figure 6B and Figure 6C In the figure, the interior trim is indicated by hatching (right side of the figure). The slight pivoting movement of the guide rail 2214 about the bolt 2216 is indicated by means of an arrow. Similarly, the movement (vibration) of the low frequency speaker 30 is indicated by means of an arrow.

[0034] In the second state, the contact layer 2220 can be moved to a second position so that it is no longer disposed between the low frequency speaker 30 and the interior. Fig. 7A , Figure 7B and Figure 7C. It can be seen that when the contact layer 2220 is moved to the second position and is no longer arranged between the low frequency speaker 30 and the interior, the vibration is not transmitted from the low frequency speaker 30 to the interior, and the second acoustic path is interrupted. However, removing the contact layer 2220 to interrupt the second acoustic path is only an example. According to another example, in the second state, the low frequency speaker 30 moves (for example, in a direction away from the interior toward the back of the chair 220) so as to increase the distance between the low frequency speaker 30 and the contact layer 2220. The increased distance can be large enough so that the low frequency speaker 30 is no longer adjacent to the contact layer 2220 even if it vibrates. In this way, the second sound path can also be interrupted. The second acoustic path can generally be interrupted in any other suitable manner.

[0035] Reference now Fig.9A , Fig. 9B , Fig. 10A and Fig. 10B , schematically illustrates a bearing according to a further embodiment of the present disclosure. The bearing in this example includes a mounting mechanism in addition to the rail 2214 and the bolt 2216. The bolt 2216 in this example does not include a flexible section. That is, the bolt 2216 is a rigid component and is inserted into a counterpart provided by the rail 2214. The bolt 2216 may be firmly attached (rigidly connected) to the rail 2214, or may be pivotally attached to the rail 2214. The bolt 2216 is not as described above. Figure 5A-5B The mounting mechanism is not firmly attached to the frame 2210, but is attached to the frame 2210 by means of a mounting mechanism. The mounting mechanism includes a rigid component 2230 firmly attached to the frame 2210, and a flexible component 2232 coupled to the rigid component 2230. Bolt 2216 is attached to the flexible component 2232. For example, the flexible component 2232 may include a second counterpart, and the bolt 2216 may be inserted into the counterpart provided by the guide rail 2214 at a first end, and inserted into the second counterpart provided by the flexible component 2232 at a second end opposite to the first end. The mounting mechanism also includes a lever 2234. The lever 2234 is attached to the bolt 2216 at a position between the guide rail 2214 and the flexible component 2232. For example, the lever 2234 may include a through hole, and the bolt 2216 may extend through the through hole. The lever 2234 is configured to move from a first position to a second position, and vice versa. When the lever 2234 is in the first position, a secure connection is formed between the bolt 2216 and the rigid assembly 2230 (see Fig.9A and Fig. 10A ), and when the lever 2234 is in the second position, the bolt 2216 is directly connected only to the flexible component 2232, but there is no firm connection between the bolt 2216 and the rigid component 2230.

[0036] That is, when the lever 2234 is in the first position, the vibration caused by the low frequency speaker 30 is transmitted to the frame 2210 via the guide rail 2214, the bolt 2216, the lever 2234 and the rigid component 2230. When the lever 2234 is in the second position, the vibration caused by the low frequency speaker 30 is transmitted to the flexible component 2232 via the guide rail 2214 and the bolt 2216. The flexible component 2232 itself will start to vibrate, and no vibration or only little vibration or (significantly) damped vibration will be transmitted from the flexible component 2232 to the rigid component 2230 and the frame 2210.

[0037] For example, the rigid component 2230 may be or include a sleeve. The sleeve may be partially interrupted along its circumference. When the lever 2234 is in the first position, it may contact and directly abut the sleeve, so that when the low frequency speaker 30 vibrates, the vibration is transmitted from the bolt 2216 to the sleeve via the lever 2234. When the lever 2234 is in the second position, it may be arranged so that it faces the area where the sleeve is interrupted. That is, in the second position, the lever 2234 is not directly adjacent to the sleeve, and vibration is not transmitted from the lever 2234 to the sleeve. Fig.9A and Fig. 10A The lever 2234 is schematically shown arranged in a first position. The uninterrupted portion of the sleeve is Fig. 10A The vibration transmitted from the lever 2234 to the rigid component 2230 is schematically shown in bold. Fig. 10A Indicated by arrows. Fig. 10A , lever 2234 is shown in phantom so as not to obscure any of the other components. Fig. 9B and Fig. 10B The lever 2234 is schematically shown arranged in the second position. As discussed above, in the second state, vibrations are not transmitted from the lever 2234 to the rigid component 2230. Instead, the flexible component 2232 vibrates, Fig. 10B 2216 in a desired position while being flexible enough to move and vibrate to a certain extent when the low frequency speaker 30 vibrates. In summary, the flexible component 2232 flexibly connects the bolt 2216 to the rigid component 2230. The lever 2234 can be considered to be inactive when it is in its second position. In the first position, the lever 2234 provides a mechanical connection (mechanical shortcut) between the bolt 2216 and the rigid component 2230. That is, when the lever 2234 is in its first state, the flexible component 2232 can be considered to be inactive.

[0038] For example, the chair 220 may be a driver's seat of the vehicle 10. Similar to the above description, the second low frequency speaker 32 may be arranged in the front passenger seat 222. That is, the front passenger seat 222 may include: a seating area 2204 and a backrest 2202, wherein the seating area 2204 is arranged at the lower end of the backrest 2202; a low-frequency speaker 32, which is configured to emit sound at a frequency between 20 Hz and 200 Hz; and a connecting mechanism 40, which is configured to change between at least two different states, wherein in a first state, the low-frequency speaker 32 is connected to the front passenger seat 222 via at least one acoustic path, so that vibration is transmitted from the low-frequency speaker 32 to the front passenger seat 222 via each of the at least one acoustic path, wherein the vibration can be perceived as tactile feedback by an occupant sitting on the front passenger seat 222, and in a second state, each of the at least one acoustic path is interrupted, so that no or almost no vibration is transmitted from the low-frequency speaker 32 to the front passenger seat 222, and thus cannot be perceived as tactile feedback by the occupant sitting on the front passenger seat 222.

[0039] One or more low frequency speakers 30, 32 as described above can be easily integrated into an existing sound field arranged in front of the driver and / or front passenger of the vehicle 10. For the driver / front passenger 24 of the vehicle 10, the arrangement of the speakers as described above can create a feeling that the driver / front passenger is surrounded by the bass produced by the low frequency speakers 30, 32.

[0040] It will be appreciated that the systems shown are merely examples. Although various embodiments of the present invention have been described, it will be apparent to one of ordinary skill in the art that there may be more embodiments and implementations within the scope of the present invention. Specifically, the skilled person will recognize the interchangeability of various features from different embodiments. Although these techniques and systems have been disclosed in the context of certain embodiments and examples, it will be appreciated that these techniques and systems may extend beyond the specifically disclosed embodiments to other embodiments and / or their uses and obvious modifications. Therefore, the present invention is not limited except in accordance with the appended claims and their equivalents.

[0041] The description of the embodiment has been presented for the purpose of illustration and description. Suitable modifications and variations of the embodiment can be performed according to the above description or can be obtained by the practice method. The arrangement is exemplary in nature and may include additional elements and / or omit elements. As used in this application, elements listed in singular form and preceded by the wording "one" or "a kind of" should be understood as not excluding multiple elements, unless such exclusion is indicated. In addition, reference to "one embodiment" or "an example" of the present disclosure is not intended to be interpreted as excluding the existence of additional embodiments that also contain the listed features. The terms "first", "second" and "third" etc. are only used as labels, and are not intended to impose numerical requirements or specific positional order on their objects. The system is exemplary in nature and may include additional elements and / or omit elements. The subject matter of the present disclosure includes all novel and non-obvious combinations and sub-combinations of the various systems and configurations disclosed and other features, functions and / or properties. The attached claims specifically point out the subject matter that is considered to be novel and non-obvious from the above disclosure.

Claims

1. A chair (220), comprising a seating area (2204) and a backrest (2202), wherein the seating area (2204) is arranged at a lower end of the backrest (2202); a low frequency speaker (30) configured to emit sound at a frequency between 20 Hz and 200 Hz; and A coupling mechanism (40), wherein The coupling mechanism (40) is configured to change between at least two different states, wherein in a first state, the low frequency speaker (30) is coupled to the chair (220) via at least one acoustic path, so that vibration is transmitted from the low frequency speaker (30) to the chair (220) via each of the at least one acoustic path, wherein the vibration can be perceived as tactile feedback by a user seated on the chair (220), and in a second state, each of the at least one acoustic path is interrupted, so that no or almost no vibration is transmitted from the low frequency speaker (30) to the chair (220), thereby failing to be perceived as tactile feedback by a user seated on the chair (220).

2. The chair (220) of claim 1, further comprising a frame (2210) covered by an upholstery, wherein the frame (2210) and the upholstery define the seating area (2204) and the backrest (2202), and the attachment mechanism (40) comprises a contact layer (2220), wherein In the first state, the contact layer (2220) is arranged between the back side of the low frequency speaker (30) and the interior and directly adjacent to the low frequency speaker (30) and the interior, wherein the back side of the low frequency speaker (30) is the side facing the interior of the chair (220), and, In the second state, direct contact between the contact layer (2220) and at least one of the low frequency speaker (30) and the interior is interrupted.

3. A chair (220) as described in claim 1 or 2, further comprising a frame (2210) covered by an upholstery, wherein the frame (2210) and the upholstery define the seating area (2204) and the backrest (2202), and the connecting mechanism (40) comprises a bearing (2212) for mounting the low-frequency speaker (30) to the frame (2210).

4. The chair (220) of claim 3, wherein the bearing (2212) comprises A first bearing member, the first bearing member comprising a first bolt (2216) and a first guide rail (2214), the first guide rail comprising a counterpart, and the first bolt (2216) comprising a rigid first section (2216a) and a flexible second section (2216b), wherein in the first state, the rigid first section (2216a) is inserted into the counterpart so that the first guide rail (2214) is rigidly attached to the first bolt (2216) or can pivot around the first bolt, and in the second state, the flexible second section (2216b) is inserted into the counterpart and the rigid first section (2216a) is arranged completely outside the counterpart, and A second bearing member, the second bearing member includes a second bolt (2216) and a second guide rail (2214), the second guide rail includes a counterpart, and the second bolt (2216) includes a rigid first section (2216a) and a flexible second section (2216b), wherein in the first state, the rigid first section (2216a) is inserted into the counterpart so that the second guide rail (2214) is rigidly attached to the second bolt (2216) or can pivot around the second bolt, and in the second state, the flexible second section (2216b) is inserted into the counterpart and the rigid first section (2216a) is completely arranged outside the counterpart.

5. The chair (220) of claim 4, wherein The low frequency speaker (30) comprises a speaker housing, and The first guide rail (2214) is attached to the speaker housing and extends from the speaker housing toward a first side, and the second guide rail (2214) is attached to the speaker housing and extends from the speaker housing toward a second side opposite to the first side.

6. The chair (220) of claim 5, wherein the first guide rail and the second guide rail (2214) are attached to an upper side of the speaker housing, wherein the upper side is a side facing an upper end of the backrest (2202), the upper end being opposite to a lower end of the backrest (2202).

7. The chair (220) of claim 3, wherein the bearing comprises a first bearing member and a second bearing member, wherein each of the first bearing member and the second bearing member comprises a bolt (2216), a guide rail (2214), and a mounting mechanism, and wherein The guide rail (2214) includes a first counterpart, and the first end of the bolt (2216) is inserted into the counterpart, so that the guide rail (2214) is rigidly attached to the bolt (2216) or can pivot around the bolt, The mounting mechanism includes a rigid component (2230) securely attached to the frame (2210), and a flexible component (2232) coupled to the rigid component (2230), A second end of the bolt (2216) opposite to the first end is attached to the flexible component (2232), The mounting mechanism also includes a lever (2234) attached to the bolt (2216) at a position between the guide rail (2214) and the flexible component (2232), wherein the lever (2234) is configured to move from a first position to a second position, and vice versa, wherein when the lever (2234) is in the first position, a secure connection is formed between the bolt (2216) and the rigid component (2230), and when the lever (2234) is in the second position, the bolt (2216) is directly connected only to the flexible component (2232) and there is no secure connection between the bolt (2216) and the rigid component (2230).

8. The chair (220) of claim 7, wherein the flexible component (2232) comprises or consists of rubber.

9. A chair (220) as described in claim 7 or 8, wherein the rigid component (2230) is or includes a sleeve, wherein the sleeve is partially interrupted along its circumference so that when the lever (2234) is in the first position, it contacts and directly abuts the sleeve, and when the lever (2234) is in the second position, it faces the area where the sleeve is interrupted, so that the contact between the lever (2234) and the rigid component (2230) is interrupted.

10. The chair (220) of any one of the preceding claims, wherein the chair (220) is a car seat arranged in a vehicle (10).

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