Title: Housing loudspeaker

What is claimed as new and desired to be protected by Letters Patent is set forth in the appended claims:

1. A loudspeaker comprising a housing having an interior defined by an inner wall; a loudspeaker element in said interior and having a vibration member, said housing being formed with a loudspeaker opening in one face thereof and an additional opening at an opposite face thereof, said openings defining a box-like intermediate space in said interior; and means for eliminating the sound emitted by the loudspeaker into said interior, said means including a filling with two sound-absorbing faces mounted in said box-like intermediate space between said loudspeaker opening and said additional opening, one of said faces being defined by a flow-tight closure of an elastically vibrationable mass positioned within said interior and having a predetermined size, and the other of said faces being defined by at least one air-flow opening in said closure, said air-flow opening being filled with a packing and having a size much smaller than the size of the flow-tight closure.

2. The loudspeaker as defined in claim 1, wherein said packing is formed of granulated material.

3. The loudspeaker as defined in claim 1, wherein said packing is formed of filament-like material with a direction of filaments being transverse to said air-flow opening.

4. The loudspeaker as defined in claim 1, wherein said closure has a larger mass than that of the vibration member of the loudspeaker.

5. The loudspeaker as defined in claim 4, said flow-tight closure including at least one plate-like combined member, said combined member including an elastically deformable layer and a plastically yieldable layer adjacent said elastically deformable layer.

6. The loudspeaker as defined in claim 5, said elastically deformable layer being made of plastic.

7. The loudspeaker as defined in claim 5, said elastically deformable layer being made of rubber.

8. The loudspeaker as defined in claim 5, said plastically yieldable layer being made of felt.

9. The loudspeaker as defined in claim 5, wherein said plate-like combined member includes at least one weight mounted in a central area of said plate-like combined member.

10. The loudspeaker as defined in claim 9, wherein said weight is mounted on a side of the plastically yieldable layer opposite to said elastically deformable layer.

11. The loudspeaker as defined in claim 10, wherein said weight is connected to the plastically yieldable layer by bonding.

12. The loudspeaker as defined in claim 10, wherein said plate-like member includes at least one elastic element retaining said weight on said combined member.

13. The loudspeaker as defined in claim 12, said elastic element being a torsion spring.

14. The loudspeaker as defined in claim 13, wherein said elastically deformable layer is mounted to said plastically yieldable layer in a dotwise fashion.

15. The loudspeaker as defined in claim 13, wherein said weight is a metal disc.

16. The loudspeaker as defined in claim 13, wherein said weight is a metal ring.

17. The loudspeaker as defined in claim 1, wherein said air-flow opening is formed by a perforation in the plate-like combined member.

18. The loudspeaker as defined in claim 17, said plate-like combined member further including textile webs which cover said perforation at both ends thereof.

19. The loudspeaker as defined in claim 1, wherein said flow-tight closure includes a plurality of successive plate-like combined members spaced from each other in said intermediate space by a predetermined distance.

20. The loudspeaker as defined in claim 19, wherein said flow-tight closure includes two plate-like combined members mounted in said interior in a mirrow-inverted relation.

21. The loudspeaker as defined in claim 20, wherein said two plate-like combined members are connected to each other by a frame.

22. The loudspeaker as defined in claim 2, wherein said granulated material is rounded.

23. The loudspeaker as defined in claim 22, wherein said granulated material is ball-shaped.

24. The loudspeaker as defined in claim 23, wherein said granulated material is provided with a rough surface.

25. The loudspeaker as defined in claim 25, wherein said granulated material is formed of gas chromatographic compounds.


Other info:


Inventors: Gieger, Hans-joachim (Fischerbrucke 5, 3300 Braunschweig, DE)

Application Number: 06/342163
Filing Date: 1982-01-25
Publication_date: 1984-03-13
Assignee: Gieger, Hans Joachim (DE)

Primary Class(es): 181/151 181/199
Other Classes: H04R1/28; H05K5/00
US Patent Ref:
Other Refs: DE2336416

July, 1973

181/155

Primary Examiner: Fuller, Benjamin R.
Assistant Examiner:
Attorney: Striker, Michael J.