Length measuring system, length measuring instrument and length measuring method

摘要

The length measurement system is provided with a scale pattern indicating a main scale, a band-shaped scale portion having an interpolation pattern indicating a position lower than the position indicated by the main scale, and a slideable relative to the scale portion. An instruction unit that indicates a target measurement position, a reading unit that reads the scale pattern and the interpolation pattern, and a measurement position that the instruction unit points to is measured based on the scale pattern and the interpolation pattern that are read by the reading unit. A length measurement unit including a data processing unit that calculates a value; and a data storage unit that stores a measurement value measured by the length measurement unit.