| 摘要 |
PURPOSE:To prevent the overrun of an optical system by providing a movable light source, a carriage, a switch means, a lever, and the first and second contacting parts. CONSTITUTION:If the optical system overruns when the movable light source 22 goes, the lower end 61d of a lever 61 is brought into contact with a contacting part 67 provided in the going direction of a base body 27. Consequently, the lever 61 is turned in the direction of an arrow D, and the lower end 61d of the lever 61 pushes the actuator of a microswitch 63 to top a motor 57. If the optical system overruns when the movable light source returns, that is, it is moved in the direction of an arrow C, the upper end 61u of the lever 61 is brought into contact with a contacting part 69 provided in the returning direction of the base body. The lever 61 is turned in the direction of the arrow D, and the lower end 61d of the lever 61 pushes the actuator of the microswitch 63 to stop the driving of the motor 57. Thus, the overrun of the optical system is prevented.
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