CN116868582A - Head restraint for a vehicle seat and vehicle seat - Google Patents

Abstract

The invention relates to a headrest (10) for a vehicle seat (1), comprising a headrest carrier (30), a first speaker unit (40) and at least one second speaker unit (42), wherein the first speaker unit (40) and the at least one second speaker unit (42) are carried by the headrest carrier (30), the headrest (10) further comprising a decorative element (20) and a cover (50), wherein the decorative element (20) covers the headrest carrier (30), the first speaker unit (40) and the at least one second speaker unit (42) in the direction of the abutment surface (32), and the cover (50) covers the headrest carrier (30), the first speaker unit (40) and the at least one second speaker unit (42) in the opposite direction to the abutment surface (32), wherein the decorative element (20), the headrest carrier (30) and the cover (50) are configured in such a way that sound generated by the first speaker unit (40) can be output from the headrest (10) to the outside of the headrest environment (10) in a substantially non-damped manner. The invention also relates to a vehicle seat (1) having a backrest (4), the backrest (4) comprising a headrest (10) according to the invention.

Description

Head restraint for a vehicle seat and vehicle seat

Technical Field

The invention relates to a headrest for a vehicle seat, comprising a headrest carrier, a first loudspeaker unit and at least one second loudspeaker unit, wherein the first loudspeaker unit and the at least one second loudspeaker unit are carried by the headrest carrier, and further comprising a decorative element and a cover, wherein the decorative element covers the headrest carrier, the first loudspeaker unit and the at least one second loudspeaker unit in the direction of an abutment surface, and the cover covers the headrest carrier, the first loudspeaker unit and the at least one second loudspeaker unit in the direction opposite to the abutment surface. The invention also relates to a vehicle seat.

Background

A headrest for a vehicle is generally known from the prior art, wherein a filler material in the form of foam is provided between an outer trim and an inner connecting member for connecting the headrest to a headrest holding member. For example, in a known headrest, a preformed foam member for filling the headrest member is provided in this case.

DE 10 2005 015 292 B3 discloses such a headrest for vehicles. The headrest includes a headrest member and a headrest holding member, wherein a garnish is provided on an outer side of the headrest member. Inside the headrest member, a connection member for connecting the headrest holding member to the headrest member is provided, wherein a filler material made of foam is provided between the connection member and the garnish. The filling material is configured to be liquid in its working state, wherein the connecting member and the trim piece define a substantially fluid-tight spatial region with respect to the filling material in its working state. Furthermore, a method of manufacturing a headrest is described.

DE 10 2015 212 510 A1 discloses a headrest with a headrest member having at least one frame with one or more internal flexible support elements forming an abutment surface, and which is initially produced from a plastics material, in particular a material or composite material free of foamed material.

EP 3 274 215 B1 discloses a headrest with an integrated functional module, wherein the functional module is a loudspeaker unit.

WO 2019/121266 A1 discloses a headrest with a dipole loudspeaker. The dipole loudspeaker is adapted to produce sound at bass frequencies. The dipole loudspeaker has a diaphragm having a first radiating surface and a second radiating surface, wherein the first radiating surface and the second radiating surface are located on opposite sides of the diaphragm, and wherein the first radiating surface and the second radiating surface each have a length of at least 100cm ² Is a surface area of the substrate. The dipole loudspeaker further has a drive unit configured to move the diaphragm at a bass frequency such that the first radiating surface and the second radiating surface produce sound at the bass frequency, wherein the sound produced by the first radiating surface is opposite in phase to the sound produced by the second radiating surface.

Disclosure of Invention

It is an object of the invention to improve a headrest of the type mentioned in the introduction, in particular a headrest with integrated speakers, with reduced required constructional space and at the same time to propose an extended audio range and to provide a corresponding vehicle seat.

According to the invention, this object is achieved by a headrest for a vehicle seat, having a headrest carrier, a first speaker unit and at least one second speaker unit, wherein the first speaker unit and the at least one second speaker unit are carried by the headrest carrier, and having a decorative element and a cover, wherein the decorative element covers the headrest carrier, the first speaker unit and the at least one second speaker unit in the direction of the abutment surface, and the cover covers the headrest carrier, the first speaker unit and the at least one second speaker unit in the direction opposite to the abutment surface.

Wherein the decorative element, the headrest carrier and the cover are configured in such a way that sound generated by the first speaker unit, in particular by the diaphragm of the first speaker unit, can be output from the headrest to the external environment of the headrest in a substantially undamped manner, in particular in a direction perpendicular to the diaphragm of the first speaker unit, which makes it possible to use the principle of a so-called "open sound baffle". The term "substantially undamped" is intended to be understood as meaning a specific air flow resistance of less than 200Pa s/m in this case. The term "substantially undamped" is not intended to include values greater than 200Pa s/m. Preferably, the specific air flow resistance is less than 100Pa s/m, very preferably less than 25Pa s/m, as measured in each case according to ISO 9053, method B.

Advantageous embodiments, which can be used alone or in combination with each other, are set forth in the dependent claims.

The specific air flow resistance of the decorative element may be less than 200Pa s/m, in particular less than 100Pa s/m, very preferably less than 25Pa s/m. The specific air flow resistance of the decorative element in the region covering the first speaker unit and/or the at least one second speaker unit may be less than 200Pa s/m, in particular less than 100Pa s/m, very preferably less than 25Pa s/m, as measured in each case according to ISO 9053, method B.

The specific air flow resistance of the cover may be less than 200Pa s/m, in particular less than 100Pa s/m, very preferably less than 25Pa s/m. The specific air flow resistance of the cover in the area covering the first speaker unit and/or the at least one second speaker unit may be less than 200Pa s/m, in particular less than 100Pa s/m, very preferably less than 25Pa s/m, as measured according to ISO 9053, method B in each case.

The first speaker unit may be an acoustic dipole speaker. The at least one second speaker unit may be an acoustic dipole speaker.

The first speaker unit may be centrally retained in the headrest carrier. The at least one second speaker unit may be held in the headrest carrier in a laterally offset manner relative to the first speaker unit. The headrest may have two second speaker units. The two second speaker units may be arranged laterally opposite to each other with respect to the first speaker unit. The first speaker unit may be disposed between the two second speaker units.

The first speaker unit may be a low frequency speaker. The woofer is also known as a woofer or woofer. The low-frequency speaker may be in the form of an open speaker without a speaker unit, in particular a diaphragm or a wall-mounted speaker. In particular, the low frequency speaker may be in the form of an acoustic dipole speaker or an acoustic baffle speaker. The first speaker unit may be a speaker unit known from WO 2019/121266 A1.

The second speaker unit may be a midrange speaker. Mid-range speakers are also known as midrange speakers. The second speaker unit may be a tweeter. Tweeters are also known as tweeters. The second speaker unit may be a combined mid/tweeter. For example, the second speaker unit may be in the form of an open speaker without a speaker unit, in particular a diaphragm speaker or a wall-mounted speaker. In particular, the second speaker unit may be in the form of an acoustic dipole speaker or an acoustic baffle speaker.

The headrest carrier may form an abutment surface provided with a plurality of internal flexible support elements. The abutment surface may be formed by a support element. The specific air flow resistance of the abutment surface, in particular in the region of the support element, may be less than 200Pa s/m, in particular less than 100Pa s/m, very particularly preferably less than 25Pa s/m.

The headrest carrier may be manufactured from a plastics material or a composite material. Such a headrest carrier can be manufactured in a cost-effective manner and also has good damping and support properties without the use of foamed material (in a foam-free manner). In this case, the use, in particular the use of the foamed material, can be dispensed with, in particular entirely. For example, the headrest carrier is made of an anti-vibration elastoplastic or thermoplastic material, in particular a thermoplastic material, polypropylene, polyurethane, polyethylene or polycarbonate acrylonitrile butadiene styrene (PC-ABS). Preferably, the headrest carrier is formed by injection molding a material that does not contain foamed plastic material or by multi-component injection molding from multiple plastic materials.

The support element may form an ergonomically configured abutment surface (also referred to as a headrest surface) of the headrest carrier. In particular, the support element forms a concave abutment surface. In this case, the abutment surface may be formed in such a recessed manner that it has a larger abutment surface than the conventional headrest member. In particular, a headrest carrier having a concave abutment surface allows the rear of the head, in particular the head of an occupant, to abut the abutment surface and be laterally supported.

The decorative element may have perforations in the areas covering the first and the at least one second speaker unit and the abutment surface. The headrest carrier and the decorative element may have perforations in areas laterally covering the at least one second speaker unit. The cover may have perforations in an area covering the first speaker unit in a direction opposite to the abutment surface. The term "perforation" in the context of the present invention is generally intended to be understood as a planar arrangement of holes, in particular for regularly structuring hole patterns having different or identical shapes and sizes of holes.

The decorative element may have a decorative material and a foam layer. The decorative element may have a woven decorative material and a foam layer. The foam layer may be stitched to the trim material. The thickness of the foam layer is up to 20mm. The foam layer preferably has a thickness of up to 15 mm. The thickness of the foam layer is extremely preferably up to 10mm. The foam layer may be an acoustic foam layer.

The at least one acoustic waveguide may be disposed between the first speaker unit and the at least one second speaker unit. Preferably, the first loudspeaker unit is arranged centrally between the two second loudspeaker units, wherein the acoustic waveguide may be arranged in each case between the first loudspeaker unit and the second loudspeaker unit. The acoustic waveguide may be integrated in the headrest carrier. The acoustic waveguide preferably extends over the entire height of the first speaker unit and/or over the entire height of the second speaker unit. In a preferred embodiment, the acoustic waveguide allows for the forward and/or backward, preferably forward and backward output of acoustic waves.

According to the invention, this object is also achieved by a vehicle seat with a backrest having a headrest according to the preceding description.

Drawings

The invention is explained below with reference to an advantageous exemplary embodiment shown in the drawings and with reference to two variants of this exemplary embodiment. However, the present invention is not limited to this exemplary embodiment. In the drawings:

fig. 1: there is shown a vehicle seat according to the invention having a headrest according to the invention,

fig. 2: an exploded view of the headrest is shown,

fig. 3: an additional exploded view of the headrest is shown,

fig. 4: a cross-sectional view of the headrest is shown along cross-sectional plane IV-IV in figure 8,

fig. 5: a cross-sectional view of the headrest is shown along the cross-sectional plane V-V in figure 8,

fig. 6: a cross-sectional view of the headrest is shown along cross-sectional plane VI-VI in figure 8,

fig. 6A: a cross-section of fig. 6 is shown, supplemented by an alternative acoustic waveguide according to a first variant,

fig. 6B: a cross-section of fig. 6 is shown, supplemented by an alternative acoustic waveguide according to a second variant,

fig. 7: a cross-sectional view of the headrest is shown along cross-sectional plane VII-VII in figure 6,

fig. 8: showing a cross-sectional view of the headrest along cross-sectional plane VIII-VIII in FIG. 6, an

Fig. 9: a cross-sectional view of the headrest is shown along the cross-sectional plane IX-IX in fig. 6.

Detailed Description

Fig. 1 shows a vehicle seat 1 according to the invention with a headrest 10 according to the invention.

The vehicle seat 1 shown schematically in fig. 1 has a seat component 2 and a backrest 4 and is described below using three spatial directions extending perpendicularly to one another. The longitudinal direction x extends in the vehicle seat 1, the vehicle seat 1 being fitted in the vehicle substantially horizontally and preferably parallel to a longitudinal vehicle direction, which corresponds to a conventional direction of travel of the vehicle. The transverse direction y extending perpendicular to the longitudinal direction x is also horizontally oriented in the vehicle and extends parallel to the vehicle transverse direction. The vertical direction z extends perpendicular to the longitudinal direction x and perpendicular to the transverse direction y. In the vehicle seat 1 fitted in the vehicle, the vertical direction z extends parallel to the vertical vehicle axis.

The position and direction indications used, for example front, rear, top, bottom and sideways, relate to the viewing direction of an occupant sitting in the vehicle seat 1 in a normal sitting position, wherein the vehicle seat 1 is fitted in the vehicle, in a use position suitable for transporting a person with the upright backrest 4 and oriented in the direction of travel as usual. However, the vehicle seat 1 according to the invention can also be fitted in different orientations, for example transversely with respect to the direction of travel.

The headrest 10 is arranged at the upper edge of the backrest 4. Fig. 2 and 3 show the headrest 10 in an exploded view. Fig. 4-6 illustrate the headrest 10 along different cross-sectional planes of fig. 8. Fig. 7-9 show cross-sectional views of the headrest 10 along different cross-sectional planes of fig. 6.

Fig. 2 to 9 are described together below.

The headrest 10 has a decorative element 20, a headrest carrier 30, a first speaker unit 40, two second speaker units 42, and a cover 50. The headrest 10 has a headrest holding member 60, and the headrest 10 is connectable to a frame structure of the backrest 4 of the vehicle seat 1 through the headrest holding member 60. The headrest holding member 60 may be fixed to the frame structure. The headrest 10 is vertically adjustable.

The first speaker unit 40 and the two second speaker units 42 are carried by the headrest carrier 30. For this purpose, the first speaker unit 40 and the two second speaker units 42 are held in respective recesses of the headrest carrier 30 in a form-fitting and/or non-form-fitting locking manner. The first speaker unit 40 and/or the two second speaker units 42 may be clip-fitted in the headrest carrier 30.

The decoration element 20 covers the headrest carrier 30, the first speaker unit 40, and the two second speaker units 42 at the front side of the headrest 10. The front side of the headrest 10 is used by the abutment surface 32 to abut the head of an occupant of the vehicle seat 1. The cover 50 covers the headrest carrier 30, the first speaker unit 40, and the two second speaker units 42 in the rearward direction. The cover 50 covers the headrest carrier 30, the first speaker unit 40 and the two second speaker units 42 on the side of the headrest 10 facing away from the abutment surface 32. The abutment surface 32 of the headrest carrier 30 is formed by a plurality of internal flexible support elements 34.

The decorative material is preferably an inflatable fabric, but may also be a leather layer or a synthetic leather layer. If the decorative element 20 is made of, for example, an extensible fabric, the decorative element 20 has perforations 22 in the area covering the first speaker unit 40 and the at least one second speaker unit 42, which perforations 22 are formed, in particular, by varying the mesh size or by holes. If the decorative element 20 is made of leather or synthetic leather, for example, the decorative element 20 has perforations 22 in the area covering the first speaker unit 40 and the at least one second speaker unit 42, which perforations 22 are formed in particular by providing holes. The decorative element 20 has the same configuration of the outer perforations 22 in the area laterally covering the second speaker unit 42.

The decorative element 20 preferably has a decorative material and a foam layer. The foam layer is stitched to the trim material. Spot adhesive bonding of the foam layer to the decorative material distributed over the face is also conceivable. The foam layer is preferably an acoustic foam layer that is adapted to reduce the natural vibration of the various components of the headrest 10.

The cover 50 has perforations 52 in the area where the side facing away from the abutment surface 32 covers the first speaker unit 40. The headrest carrier 30 has perforations 36 in areas laterally covering the second speaker unit 42.

The perforations 22 of the decorative element 20, the perforations 36 of the headrest carrier 30 and the perforations 52 of the cover 50 serve to configure the propagation path of the sound pressure generated by the speaker units 40, 42 to be as open as possible, so that the sound pressure can be discharged out of the decorative element 20 or the cover 50 forward and backward in a substantially unaffected state, in particular in a non-damped state.

The headrest 10 optionally has acoustic waveguides 31A, 31B. Fig. 6a shows a stippling view of an acoustic waveguide 31A according to a first modification. Fig. 6B shows a dot/shadow illustration of the acoustic waveguide 31B according to the second modification. The acoustic waveguides 31A, 31B are in this case integrated in the headrest carrier 30. The acoustic waveguides 31A, 31B separate the first speaker unit 40 from the second speaker unit 42 acoustically by the acoustic waveguides 31A, 31B each laterally separating the space for receiving the first speaker unit 40 from the space for receiving the second speaker unit 42. Accordingly, the sound of the first speaker unit 40 can be outputted only forward through the decorative member 20 and backward through the cover 50. Thus, the sound waves of the first speaker unit 40 interfere with the sound waves of the second speaker unit 42 substantially only spatially in front of the decorative element 20 and behind the cover 50. The sound quality can thereby be significantly improved and, in addition, the active noise suppression, also referred to as active noise cancellation (Active Noise Cancellation), can be better provided for the headrest 10.

The features disclosed in the above description, in the claims and in the drawings may be important, individually or together, for the implementation of the invention in its various embodiments, as long as they fall within the scope of protection of the independent patent claims.

List of reference numerals

1. Vehicle seat

2. Seat component

4. Backrest for chair

10. Headrest for head

20. Decorative element

22. Perforation

30. Headrest carrier

31a acoustic waveguide

31b acoustic waveguide

32. Adjacent surface

34. Support element

36. Perforation

40. First speaker unit

42. Second speaker unit

50. Covering material

52. Perforation

60. Headrest holding member

x longitudinal direction

y transverse direction

z vertical direction

Claims (15)

1. Headrest (10) for a vehicle seat (1) having a headrest carrier (30), a first speaker unit (40) and at least one second speaker unit (42), wherein the first speaker unit (40) and the at least one second speaker unit (42) are carried by the headrest carrier (30), the headrest (10) further having a decorative element (20) and a cover (50), wherein the decorative element (20) covers the headrest carrier (30), the first speaker unit (40) and the at least one second speaker unit (42) in the direction of an abutment surface (32), and the cover (50) covers the headrest carrier (30), the first speaker unit (40) and the at least one second speaker unit (42) in the direction opposite to the abutment surface (32),

it is characterized in that the method comprises the steps of,

the decorative element (20), the headrest carrier (30) and the cover (50) are configured in such a way that sound generated by the first speaker unit (40) can be output from the headrest (10) to the environment external to the headrest (10) in a substantially undamped manner.

2. Headrest (10) according to claim 1, wherein the specific air flow resistance of the decorative element (20) is less than 200Pa s/m, in particular less than 100Pa s/m, preferably less than 25Pa s/m.

3. Headrest (10) according to claim 1 or 2, wherein the specific air flow resistance of the cover (50) is less than 200Pa s/m, in particular less than 100Pa s/m, preferably less than 25Pa s/m.

4. A headrest (10) as claimed in any one of claims 1 to 3, wherein the headrest carrier (30) has the abutment surface (32), the abutment surface (32) being provided with, in particular formed by, a plurality of internal flexible support elements (34).

5. Headrest (10) according to claim 4, wherein the specific air flow resistance of the abutment surface (32) is less than 200Pa s/m, in particular less than 100Pa s/m, preferably less than 25Pa s/m.

6. The headrest (10) according to any one of claims 1 to 5, wherein the decorative element (20) has perforations (22) in areas covering the first speaker unit (40), the at least one second speaker unit (42) and the abutment surface (32).

7. The headrest (10) according to any one of claims 1 to 6, wherein the headrest carrier (30) and the decorative element (20) have perforations (22, 36) in areas laterally covering the at least one second speaker unit (42).

8. The headrest (10) according to any one of claims 1 to 7, wherein the cover (50) has perforations (52) in a region covering the first speaker unit (40) in a direction opposite the abutment surface (32).

9. The headrest (10) according to any one of claims 1 to 8, wherein the decorative element (20) has a decorative material and a foam layer.

10. The headrest (10) as claimed in claim 9, wherein the foam layer is stitched to the trim material.

11. Headrest (10) according to any of claims 9 or 10, wherein the foam layer has a thickness of up to 20mm, in particular up to 10mm.

12. The headrest (10) according to any one of claims 9 to 11, wherein the foam layer is an acoustic foam layer.

13. The headrest (10) according to any one of claims 9 to 12, wherein at least one acoustic waveguide (31A, 31B) is provided between the first speaker unit (40) and the at least one second speaker unit (42).

14. The headrest (10) as claimed in claim 13, wherein the acoustic waveguides (31A, 31B) are integrated in the headrest carrier (30).

15. A vehicle seat (1) having a backrest (4), the backrest (4) having a headrest (10) according to any one of claims 1 to 14.