| 摘要 |
PROBLEM TO BE SOLVED: To easily perform the alignment by illuminating a lens to be worked and an index plate having a specific index pattern by the parallel luminous flux detecting an index image of the projected index plate to determine an optical center of the lens to be worked to a reference axis, and correcting a position in the working. SOLUTION: A monitor such as a liquid crystal display unit or the like is mounted on an upper front surface of a device body to display an image of a lens to be worked LE, and a mark, a layout image or the like for alignment, picked up by the CCD cameras 17a, 17b on the monitor. On this occasion, an index plate 14 comprising a specific pattern is arranged on a semi-transparent screen plate 5, and the lens to be worked LE is mounted on the same. The illumination light from an illuminating light source 10 is projected to the lens to be worked LE as the approximately parallel luminous flux from a collimator lens 13, and the index plate 14 is illuminated by the luminous flux transmitted through the lens LE, whereby the optical central position of the lens to be worked LE and the direction of a cylindrical shaft are determined by a control part through the CCD camera 17a.
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