| 摘要 |
PROBLEM TO BE SOLVED: To provide a technology capable of suppressing a reduction in rigidity of a rotation shaft to which torque is applied, and improving durability.SOLUTION: A torque detection device includes: a rotation shaft 110 that can be twisted and deformed, and has a spiral groove formed on an outer face; a light source 20 that emits light to the rotation shaft 110; and an imaging element 30 that is arranged to face an outer periphery of the rotation shaft 110 to read an image of the groove G formed on the outer face of the rotation shaft 110. |
