| 摘要 |
PURPOSE:To adjust the distance to a subject easily and finely by arranging a slit light source on both ends of a camera fixation plate where a camera is fixed in the center projecting slit light on the subject, and making an adjustment so that the slit light forms one bright line on the surface of the subject. CONSTITUTION:The camera 1 is fixed to the fixation plate 2 in the center and slit light sources 3 and 4 are fixed at both ends respectively. Slit light beams 7 and 8 projected by the light sources 3 and 4 are superposed one over the other into one on the surface of the subject 5 at distance L from the camera 1 to the subject 5 to form one slit bright line 9. The subject 5 is placed on a subject fixing jig 6 and this optical system is fixed by determining the angles of the slit light sources 3 and 4 so that the two slit light beams 7 and 8 obtained on the surface are superposed one over the other in one. Consequently, the focus of the camera 1 is set on the surface of the subject 5 and when two images are obtained, the camera fixation plate 2 is adjusted by being moved in the optical axis direction. |
