| 摘要 |
PROBLEM TO BE SOLVED: To solve the problem in which in a lens device 10, an urging force moment around a first guide member 13 due to an urging member and an own gravity moment due to a weight of a lens group are applied to a lens group holding member 12, and if the lens device 10 takes a reverse pose in a state where the urging force moment yields to the own gravity moment, looseness between a second guide member 14 and the lens holding member 12 does not allow a lens group 11 to be highly accurately held.SOLUTION: An urging force synthetic moment MS to be applied around a central axis 13a of a first guide member 13 due to urging force of an urging member is made larger than an own gravity moment MG arising from an own gravity of a lens group 11 and a lens group holding member 12, and to be applied around the central axis 13a of the first guide member 13.SELECTED DRAWING: Figure 6 |
