| 摘要 |
PURPOSE:To measure the performance of a lens easily and reliably, by aligning the optical axis of the lens to be measured and the optical axis of a light source by means of a position regulator and an angle regulator, and observing as well as picking up a magnified image formed through a detachable transparent member and a magnification objective lens and the like. CONSTITUTION:The optical axis of the light beam from a minute light source such as a laser through a light source optical system constituted by a prism 14 and the like and the optical axis of a lens 10 are aligned with each other and the lens 10 is focused by a linear regulator 2 which moves orthogonal triaxial moving tables 21, 23, 25 by means of micrometers 22, 24, 26, respectively. Moreover, the direction of the optical axis of the lens 10 is regulated by an angle regulator 4. In such an arrangement that a transparent plate is interposed between the lens 10 and its focal point, a magnified focal image corresponding to the lens performance is formed through a detachable transparent plate 32 having a predetermined thickness by the use of either of magnification objective lenses 30 and 31 which are different in magnification from each other. The magnified image is divided into two through a prism device 6, and one of the divided image parts is observed, while the other is picked up by a TV camera 7. By this arrangement, the lens can be easily and reliably regulated to its focal position for measuring the performance thereof. |
