| 摘要 |
A distance calculating device includes a plurality of distance measuring systems for measuring the distance between a surface of an object and a predetermined plane, a storing element having portions corresponding respectively to the plurality of measuring systems, for storing therein information as to effectiveness/ineffectiveness of each of values detected, as the result of measurement by the plurality of measuring systems, respectively, in accordance with points of measurement on the surface of the object, and an element for calculating the distance between the surface of the object and the predetermined plane by reference to the storing element and by use of only an effective value, of the detected values, in accordance with the points of measurement on the surface of the object.
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