| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a speaker diaphragm having high rigidity without adding a part for performing highly precise positioning or other processes. <P>SOLUTION: The speaker diaphragm 11 includes a flexible film 12 and a plurality of spiral coils 13 arranged on one face 12a of the film 12 to respectively face a plurality of magnets arranged in a speaker at prescribed intervals so that polarities of an upper magnetic pole face are alternately inverted. A projected throttle portion 12b is arranged in a thickness direction of the film 12. By having the throttle portion 12b in the film 12, rigidity of the diaphragm 11 becomes higher than when the throttle portion 12b is not provided. Since the throttle portion 12b can be arranged without the need of an additional process when the diaphragm 11 is formed, the diaphragm 11 having high rigidity can be provided without the need of the additional process when the diaphragm 11 is formed. <P>COPYRIGHT: (C)2012,JPO&INPIT |
