| 摘要 |
PURPOSE:To prevent a cone suspension from producing abnormal sound even if it is vibrated with a large amplitude during attachment of a small sized cabinet by controlling the difference of an air pressure between the inside and outside part of the cone suspension of a speaker, so as to expanding the surface always. CONSTITUTION:A diaphragm 29 of the speaker 30 is vibratably mounted to a frame 21 through a damper 32 and a cone suspension 33 consisting of a spacer having two roll edges 16a, 16b having semicylindrical cross-section, an edge securing ring 18 and a one-way air rectification valve 19. The speaker 30 is mounted within a cabinet 31. When the diaphragm 29 is vibrated back and forth and the inner pressure of the suspension 33 exceeds the inner pressure of the cabinet 31, the valve 19 is opened. Otherwise, the valve is closed. As a result, the inner radius side air pressure of the half cylinder forming the edges 16a, 16b is equal to or larger than the outside radius side pressure so that the surface of the edges 16a, 16b are in stretched state. |
