Toshiba Memory Corporation

Masamichi Kishimoto

Nobuhiro Komine

Kazufumi Shiozawa

Yoshimitsu Kato

Toshihide Kawachi

According to one embodiment, wafer lithography equipment includes an exposure unit transferring a circuit pattern onto a wafer, a measurement unit measuring a dimension of the circuit pattern and a calculator. The calculator includes calculating a first difference. The first difference is the difference between a first dimension and a second dimension. The first dimension is obtained by substituting a first exposure amount and a first focus distance into an approximate response surface function. The second dimension is measured by the measurement unit. The calculator also includes calculating a second difference. The second difference is the sum total of the first difference for all of the circuit patterns. The calculator also includes calculating a second exposure amount and a second focus distance causing the difference between the approximate response surface function and the second difference to be a minimum. The calculator also includes calculating a correction exposure amount.

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Yokkaichi, Japan

Masamichi Kishimoto