Loudspeakers with 3D printed lattice grilles
A vehicle headrest includes an electro-acoustic transducer and an acoustic enclosure. The acoustic enclosure defines an acoustic chamber. The acoustic enclosure supports the electro-acoustic transducer such that a rear radiating surface of the electro-acoustic transducer radiates acoustic energy into the acoustic chamber. A cushion member is coupled to the acoustic enclosure for supporting a user's head. A grille member overlies a front radiating surface of the electro-acoustic transducer. The grille member is formed of a 3D printed lattice.
1. A vehicle headrest comprising:
an electro-acoustic transducer;
an acoustic enclosure defining an acoustic chamber, the acoustic enclosure including a baffle member that supports the electro-acoustic transducer such that a rear radiating surface of the electro-acoustic transducer radiates acoustic energy into the acoustic chamber, wherein the baffle member includes a plurality of recesses;
a cushion member coupled to the acoustic enclosure for supporting a user's head, wherein the cushion member includes a mounting member comprising a plurality of features for engaging the plurality of recesses in the baffle member, thereby to couple the cushion member to the baffle;
a grille member overlying a front radiating surface of the electro-acoustic transducer, the grille member comprising a 3D printed lattice; and
a first coupling member supported by the grille member for coupling the grille member to the acoustic enclosure, wherein at least one of (a) the 3D printed lattice defines a recess for receiving the coupling member or (b) the first coupling member is formed integrally with the 3D printed lattice.
2. The vehicle headrest of claim 1 , wherein the acoustic enclosure comprises: a rear cover that defines a rear surface of the headrest.
3. The vehicle headrest of claim 1 , wherein the cushion member comprises: a cushion layer for supporting a user's head.
4. The vehicle headrest of claim 1 , wherein the 3D printed lattice has a non-linear load-compression profile.
5. The vehicle headrest of claim 1 , wherein the 3D printed lattice has a lattice geometry that is tuned to acoustically mask certain areas of the grille member.
6. The vehicle headrest of claim 5 , wherein the 3D printed lattice has a lattice geometry that at least partially defines an acoustic channel in the grille member.
7. The vehicle headrest of claim 1 , further comprising an acoustic channel coupled to the grille member, wherein the acoustic channel is defined, at least in part, by a continuous, contoured plane that is formed integrally with the 3D printed lattice in a 3D printing process.
8. The vehicle headrest of claim 1 , wherein the 3D printed lattice has a lattice geometry that is tuned to have an energy absorption that is substantially the same as that of the cushion member.
9. The vehicle headrest of claim 1 , further comprising a second coupling member supported by the acoustic enclosure for engaging the first coupling member, thereby to couple the grille member to the acoustic enclosure.
10. The vehicle headrest of claim 9 , wherein the first and second coupling members include hooks that interlock to couple the first and second coupling members to each other.
11. The vehicle headrest of claim 1 , wherein the first coupling member is a Christmas tree fastener, the 3D lattice defines a recess for receiving a first end of the Christmas tree fastener; and the acoustic enclosure defines an aperture for receiving a second, opposite end of the Christmas tree fastener, thereby to couple the grille member to the acoustic enclosure.
12. The vehicle headrest of claim 1 , further comprising a support rod coupled to the acoustic enclosure for securing the headrest to a seatback.
13. The vehicle headrest of claim 1 , wherein the grille member is disposed adjacent the cushion member such that the grille member and cushion member together define a front surface contour of the headrest.
14. A loudspeaker comprising:
an electro-acoustic transducer;
an acoustic enclosure defining an acoustic chamber, the acoustic enclosure including a baffle member that supports the electro-acoustic transducer such that, during operation, a rear radiating surface of the electro-acoustic transducer radiated acoustic energy into the acoustic chamber, wherein the baffle member includes a plurality of recesses configured to engage with a plurality of features associated with a cushion member for supporting a user's head;
a grille member overlying a front radiating surface of the electro-acoustic transducer, the grille member comprising a 3D printed lattice; and
a first coupling member supported by the grille member for coupling the grille member to the acoustic enclosure, wherein at least one of (a) the 3D printed lattice defines a recess for receiving the first coupling member and (b) the first coupling member is formed integrally with the 3D printed lattice.
15. The loudspeaker of claim 14 , further comprising an acoustic channel, wherein the 3D printed lattice at least partially defines the acoustic channel for diverting acoustic radiation from the front radiating surface of the electro-acoustic transducer toward a desired direction.
16. The loudspeaker of claim 14 , wherein the 3D printed lattice is formed of elastomeric polyurethane.
17. The loudspeaker of claim 14 , wherein the 3D printed lattice comprises a 3D grid of interconnected spokes of polymer that define a network of open cells.
18. The loudspeaker of claim 14 , wherein the 3D printed lattice has a non-linear load-compression profile.
19. The loudspeaker of claim 14 , wherein the 3D printed lattice has a lattice geometry that is tuned to acoustically mask certain areas of the grille member.
20. The loudspeaker of claim 19 , wherein the 3D printed lattice has a lattice geometry that at least partially defines an acoustic channel in the grille member.