| 摘要 |
PURPOSE:To obtain a light-weight and high-capacity diaphragm for speaker, by holding the surface temperature in the drop state to obtained skin materials consisting of boron or beryllium in the physical vapor-phase growing method and press-fixing them thermally to the surface of a core material with an adhesive. CONSTITUTION:An aluminum ribbon 11 is braided to form a core material 12 consisting of a chrysanthemum-shaped hollow core, and pure boron skin materials 13 are press-fixed thermally to both faces of the core material 12 to obtain a plane diaphragm 14. A vacuum deposition device is used to form skin materials 13 by the electron beam deposition method. In the device, a substrate 1 consisting of a titanium foil wich is provided on a heating device 2 and a crucible 8 are disposed to face oppositely in a bell jar 6 provided with an air discharging system 7, and boron as an evaporation source 3 is put in the crucible 8. An electron beam heating device 5 is arranged near the crucible 8. The temperature of the substrate 1 is measured by a thermocouple 4, and the surface temperature is held in the drop state to deposit boron. Titanium is removed by dissolution after forming a boron film to obtain boron skin materials 13 with the reduced residual stress. Thus, the light-weight and high-capacity diaphragm for speaker is obtained. |
