| 摘要 |
PROBLEM TO BE SOLVED: To provide a measuring instrument for measuring and evaluating positional shift of a lens mirror surface piece in a mold for molding an optical image forming element and to measure and evaluate the positional shift of the lens mirror surface piece in the mold for molding the optical image forming element with high accuracy using the measuring instrument. SOLUTION: The instrument for measuring and evaluating the positional shift of the lens mirror surface piece is equipped with an optical system for detecting the center-of-curvature position of the adjacent lens mirror surface pieces, a mold position detection means, the position adjusting means of an optical system, the focus adjusting means of the optical system and a means for operating the eccentricity of the lens mirror surface piece on the basis of the center-of-curvature position of the lens mirror surface piece and the position of the mold. The positional shift of the lens mirror surface piece is measured and evaluated with high accuracy by adapting various error correction method, using this instrument.
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