| 摘要 |
PROBLEM TO BE SOLVED: To realize simplicity, reduction in dimensions and inexpensiveness of a light adjusting device that allows for achievement of both of a diaphragm function of adjusting a light amount and a filter function of adjusting a frequency area of passing light.SOLUTION: The light adjusting device comprises: two diaphragm blade members 21 and 22 that can stop down an aperture 11 to a predetermined aperture diameter; an infrared cut filter member 30 that moves between an advance position covering the aperture and a retreat position; and a drive mechanism that drives the diaphragm blade members and the infrared-cut filter member. The drive mechanism includes a drive source 60 and link members 40 and 50 that allow a diaphragm operation to be performed by moving the diaphragm blade members 21 and 22 between a fully-opened position and a fully-closed position while maintaining the infrared cut filter member 30 at the advance position in a first rotation angle range &thetas;1 and move the infrared cut filter member 30 from the advance position to the retreat position while maintaining the diaphragm blade members 21 and 22 at the fully-opened position in a second rotation angle range &thetas;2. Thus, the light adjusting device can be made simple, compact and inexpensive. |
