| 摘要 |
PURPOSE:To prevent a photosensitive body from being irradiated with laser light when unnecessary by providing a shutter which is opened and closed on a laser light optical path extending to a photosensitive body. CONSTITUTION:The openable shutter device 20 which cuts off laser light is provided on the optical path of the laser light extending to the photosensitive body 1. The shutter device 20 has a base 21, a shutter 22 which is movable on the base, a stopper 23 which limits the movement stroke of the shutter 22, a spring 24 which holds the shutter 22 at the origin position where it contacts the stopper 23, and an electromagnetic solenoid 25 which moves the shutter 22 against the pushing force of the spring 24. The shutter 22 when positioned as shown in a figure A cuts off the laser light 26 to inhibit the laser light from impinging on the photosensitive body. |
