| 摘要 |
The edge surrounding this diaphragm has concave sections that are recessed in one direction of vibration of the diaphragm and convex sections that project in the one direction. At least portions of the edge have a first changeover shape and a second changeover shape that are continuously formed. The first changeover shape is a shape for transitioning from the concave section to the convex section and formed such that the length of the cross-sectional shape of the concave section gradually becomes shorter while the length of the cross-sectional shape of the convex section gradually becomes longer, and the second changeover shape is a shape for transitioning from the convex section to the concave section and formed such that the length of the cross-sectional shape of the concave section gradually becomes longer while the length of the cross-sectional shape of the convex section gradually becomes shorter. |
