| abstract |
The present invention provides an elliptical or racetrack type diaphragm that has a high sound speed and hardly generates divided vibrations, a speaker using the diaphragm, and a method of manufacturing the diaphragm. The present invention is a diaphragm made of a material containing a carbon fiber reinforced liquid crystal polymer and a cyclic olefin resin, and the outer peripheral shape in a plan view from a specific direction is an elliptical type or a racetrack type, The length of the major axis of the outer shape of the elliptical or racetrack type is a, the length of the minor axis is b, the thickness of the end in the major axis direction is Ta, and the thickness of the end of the minor axis direction is Tb. In this case, the relationship of 0.0003 ≦ (Ta−Tb) / (ab) ≦ 0.0030 is satisfied. [Selection] Figure 1 |