| 摘要 |
PURPOSE:To facilitate the handling and to attain convenience of it without an open operation at the reception by making a hinge for a reception section and a transmission section with a shape memory alloy and allowing the shape memory alloy to store a shape that the positional relation between the transmission and reception sections satisfies an optimum speech condition. CONSTITUTION:A shape memory alloy 4 used for a hinge for a reception section 2 and a transmission section 3 is an alloy of Ti-Ni, Cu-Zn-Al or Cu-Al-Ni or the like and stores a shape bent in a chevron shape at room temperature so that the positional relation between the reception section 2 and the transmission section 3 satisfies an optimum speech state, and the reception section 2 and the transmission section 3 are folded when not in use the alloy is bent to be nearly in U-shape and they are overlapped with each other. The shape memory alloy 4 stores the shape at which the positional relation between the reception section 2 and the transmission section 3 satisfies an optimum speech state in this way, then when an external force is removed from the folded state, the alloy 4 restores to the original shape to open the reception section 2 and the transmission section 3 to have an optimum speech condition. Thus, the opening by a hand is not required. |
