| 摘要 |
<p>The present invention further reduces a weight with an internal loss being large without reducing high rigidity and an environment resistance, thereby enabling a maximum sound pressure to be increased. A speaker diaphragm (2), and plural dimples (16) which are disposed radially from a center side toward the outside of the speaker diaphragm (2) and which have arch structures formed to have a concave-like shapes so as to disperse a stress are provided, whereby while the weight saving is realized in terms of the speaker diaphragm (2) by the plural dimples (16) formed to have the concave¬like shapes, the high rigidity is maintained by the arch structures of the dimples concerned, and a maximum sound pressure can be increased along with the weight saving concerned.</p> |
