| 摘要 |
PURPOSE: To accurately inspect the inner surface of a small diameter hole. CONSTITUTION: In the tip of a cylinder 32 formed with a light guide passage 31 of the light for lighting the inner wall surface A and the bottom surface B of a small diameter hole, a hollow cylindrical lens 34a formed with a conical mirror 36 is arranged on the same axis with the cylinder 32, and furthermore, an image pick up lens 34, which can pickup the image of the bottom surface B, is integrally fitted in the hollow part of the cylindrical lens 34a, and the base end of the cylinder 32 is provided with an image pick up means for picking up the image of the inner wall surface A, which is projected through the conical mirror 35, and the image of the bottom surface B, which is projected through the pick up lens 34, at the same time. |
