Loudspeaker damper, manufacturing method thereof, and loudspeaker and electronic device using the same
View Patent ↗A loudspeaker damper, a manufacturing method thereof, and a loudspeaker, electronic equipment and device using the loudspeaker damper. The damper has flexibility. Therefore, even if a large input is applied and the damper oscillates with a large amplitude, a resin layer provided on the surface of the damper base material is not cracked due to partial interface peeling. Thus, the damper follows such a large amplitude and realizes high input-resistance. This loudspeaker damper material is obtained by impregnating a material with thermosetting resin including 2 to 20 wt % of flexibility imparting agent and heat-curing thereof.
1. A loudspeaker damper comprising:
a material subjected to a corona discharge treatment to be subjected to a surface reforming process;
a thermosetting resin impregnating the material and heat-cured; and
2 to 20 wt % of acrylonitrile-butadiene rubber (NBR) as a flexibility imparting agent contained in the thermosetting resin.
2. The loudspeaker damper of claim 1 , wherein the flexibility imparting agent has a glass transition temperature of 10° C. or less.
3. The loudspeaker damper of claim 1 , wherein the flexibility imparting agent includes not less than 0.001 mol/100 g of at least one hydrophilic group selected from a hydroxyl group, a carboxyl group and an amino group.
4. The loudspeaker damper of claim 1 , wherein the material is made of any of fabric, aramid and polyester, and the thermosetting resin is phenolic resin or melamine resin.
5. A manufacturing method of the loudspeaker damper of claim 1 , the method comprising:
subjecting the material to corona discharge treatment before impregnating the material with the thermosetting resin.
6. The method of claim 5 , wherein a wire electrode is used as a discharging electrode in the corona discharge treatment.
7. A loudspeaker comprising:
the loudspeaker damper of claim 1 .
8. A loudspeaker comprising:
the loudspeaker damper manufactured by the method of claim 5 .
9. The loudspeaker comprising:
the loudspeaker damper manufactured by the method of claim 6 .
10. Electronic equipment comprising the loudspeaker of claim 7 and an amplifier of an electric signal to be input into the loudspeaker.
11. Electronic equipment comprising the loudspeaker of claim 8 and an amplifier of an electric signal to be input into the loudspeaker.
12. Electronic equipment comprising the loudspeaker of claim 9 and an amplifier of an electric signal to be input into the loudspeaker.
13. A device comprising the loudspeaker of claim 7 mounted on a mobile means.
14. A device comprising the loudspeaker of claim 8 mounted on a mobile means.
15. A device comprising the loudspeaker of claim 9 mounted on a mobile means.
16. The loudspeaker damper of claim 1 , wherein the material is made of woven fabric.
17. The method of claim 5 , wherein the material is made of woven fabric.
18. The method of claim 5 , wherein said subjecting of the material to corona discharge treatment comprises subjecting of the material to corona discharge treatment in atmosphere.