…The limit circle when Q and R of this circle are brought close to P along C is called the curvature circle of C at P. If the curve drawn by the center of the curvature circle at each point of C is Γ, then Γ is called the evolute of C , and C is called the involute of Γ. The involute C is the curve drawn by the end points of a string wound around Γ when it is unraveled while being stretched taut (Figure 4). … *Some terminology explanations that mention "involute" are listed below. Source | Heibonsha World Encyclopedia 2nd Edition | Information |
…この円のQ,RをCに沿ってPに近づけたときの極限の円をPにおけるCの曲率円という。Cの各点における曲率円の中心の描く曲線をΓとするとき,ΓをCの縮閉線またはエボリュートevoluteといい,CをΓの伸開線またはインボリュートinvoluteという。伸開線CはΓにまきつけた糸をピンと張りながらほぐしていったときの糸の端点が描く曲線である(図4)。… ※「involute」について言及している用語解説の一部を掲載しています。 出典|株式会社平凡社世界大百科事典 第2版について | 情報 |
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