| 摘要 |
PURPOSE:To clearly display and record the history of temp. showing whether temp. rised to specific temp. or more, by connecting a drive system comprising a shape memory alloy to a movable display body. CONSTITUTION:When a drum shaped movable display body 2 is rotated by about 180 deg. by external force, the part, to which no oblique line is applied, of the movable display body 2 is displayed on a display window 5 and displacement is imparted to drive parts 1 comprising a shape memory alloy. When circumferential temp. exceeds the transformation temp. of the shape memory alloy in this state, the drive parts 1 comprising the shape memory alloy is ready to return to the shape stored at the beginning. The drum of the movable display body 2 is rotated by 180 deg. by this force. Because this state is held in spite of the change in circumferential temp. on and after, it can be easily judged that circumferential temp. exceeded specific temp. by visual observation later on. |
