自動レンズメータの試作

抄録

We designed a vertometer for spherical ophthalmic lenses, which is automated in focusing a target in centering a lens being tested, and in marking dot its center in case within specified limits of tolerances. Light from the target is introduced into a scanning unit which detects the three-dimensional deviation of its image from a desired position and generates three signals to drive simultaneously the target and the lens so that the image of the target may come to the desired position. This procedure is followed by an automatic measurement of the deviation and marking the center, with an accuracy of some five times as attainable by the visual examination. The working principle and the experimental results are described in detail.