| 摘要 |
PURPOSE:To enable to perform a rapid and reliable measurement of a two dimentional shape, by a method wherein a coordinate at a measuring point of an object to be measured is read by an enlarging visual means, and this computes a center of a hole. CONSTITUTION:An object 10 to be measured is secured to a table 10 whch freely slides on a level surface. The image of the object 10 to be measured is formed on a projecting surface 22 through the working of a projector 26. The table is moved so that 3 points on a periphery of a hole 10a in the object to be measured coincide in order with a coordinate reading sign 24 on the projecting surface. Each time they coincide with each other, a reading command switch 28 detects the coordinats of said 3 points in displacement detectors 16, 18 and a coordinate detecting circuit 34 to store them in a memory circuit 38 via a multiplying factor correcting circuit 36. A computing circuit 42 finds an equation of a circuit passing through the 3 points, a center coordinate, radius, and the results are outputted to a CRT46 via a display output circuit 44 also in the case of the coordinate computation except a circle, an appropirate selection can be conducted by means of a change-over switch 30 and a program selecting circuit 40. |
