| 摘要 |
PURPOSE:To detect easily a distance up to a subject to be measured by forming the image of a reflected light beam available from irradiating the subject to be measured by a light source fitted on a case on the light receiving element of a case bottom by means of a reflecting mirror and a movable lens and obtaining the position where the lens moves. CONSTITUTION:The laser beam source 2 is fitted outside the bottom plate 1a of the case 1 to irradiate the subject to be measured 3. A motor 4 is fitted inside the case 1, and a threaded-rod 7 turning through an output spindle 4a and gears 5 and 6 is fitted on the case 1 in the longitudinal direction. A moving frame 8, which advances and retreats due to the turn of the threaded-rod 7, is fitted on a moving frame 8. The reflecting mirror 8c fitted obliquely on the opening of the frame 8 projects the irregularly reflected light beam from the subject to be measured 3 on the light receiving element 9 at the bottom of the frame 8 through a lens 11. A controller 16 detects the output of the light receiving element 9, drives motors 4 and 14 and condenses light beams. It obtains a distance from an interface between the lens 11 at that time and the light receiving element 9 and the subject to be measured 3. Thus optical axis matching and focusing are executed simultaneously, and measurement can be easily carried out at high accuracy. |
