URL：https://www.researchgate.net/profile/Shunichi-Kobayashi/publication/247824730/figure/fig2/AS:458720103669762@1486378803696/Relationship-between-displacement-of-plate-spring-D-and-effective-length-of-spring-H_Q320.jpg
掲載元：https://www.researchgate.net/figure/Principle-of-effective-length-spring_fig1_247824730
