| 摘要 |
<p>In the rolling process (200), a rolling amount at each time of rolling by a rolling machine is set to 1 µm to 20 µm, and a magnesium substrate (20) is heated by a constant temperature oven (22) and rolled by rollers (21). Thus, a magnesium sheet (24) of 30 µm to 100 µm is produced. This magnesium sheet (24) is used to form a bobbin (1b, 11b) and a diaphragm (1a, 11a) integrally molded with each other, and the diaphragm (1a, 11a) is molded into a semi-dome shape or a dome shape. Thus, a bobbin integrated type magnesium diaphragm having the semi-dome shaped diaphragm or the dome shaped diagram is manufactured. The bobbin integrated type magnesium diaphragm is applied to a dynamic speaker device (500,600). As a result, the high-quality dynamic speaker device, which realizes high rigidity, high sensibility, high internal loss, less distortion and the like, is obtained.</p> |
