| 摘要 |
PROBLEM TO BE SOLVED: To provide a blade drive device and stop device, as well as an imaging device that allow a relatively simple configuration to improve detection accuracy of rotating of a drive member driving blades, and enable reduction in costs.SOLUTION: A blade drive device comprises: an aperture formation member that forms an aperture part through which light passes; blades that are arranged in a periphery of the aperture part; a drive member that rotates around the periphery of the aperture part in a state engaged with the blade, and causes the blade to move in and out with respect to the aperture part; and light detection means that is provided in the aperture formation member, and detects the rotating of the drive member depending upon whether to receive reflection light obtained by light irradiation with respect to the drive member. Of the rotating drive member, in a part where the light detection means opposes, a light reflection unit is provided that constitutes a part of the drive member, and is formed of a material reflecting the light.SELECTED DRAWING: Figure 1 |
