APPARATUS FOR EXPOSING MASTER DISK FOR OPTICAL DISK AND LIGHT INTENSITY MEASURING METHOD

摘要

PROBLEM TO BE SOLVED: To measure each light intensity with high accuracy when a plurality of the light intensities exist in a recording signal.

SOLUTION: A master disk exposing apparatus for optical disks is provided with: a light quantity measurement means for measuring the light intensity of a recording signal; a time length change means for changing a time length of the recording signal with a particular light intensity among recording signals with a plurality of light intensities; and a calculation means for calculating the light intensity of the recording signal whose time length is changed on the basis of a change in the time length by the time length change means and measured values of the light intensities before and after the change in the time length by the light quantity measurement means.

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