摘要:
In a mask blank substrate to be chucked by a mask stage of an exposure system, the flatness of a rectangular flatness measurement area excluding an area of 2 mm inward from an outer peripheral end surface on a main surface of the mask blank substrate on its side to be chucked by the mask stage is 0.6 μm or less, and at least three of four corner portions of the flatness measurement area each have a shape that rises toward the outer peripheral side.
摘要:
A mask blank manufacturing department manufactures a mask blank by forming a thin film to be a mask pattern on a mask blank transparent substrate. When providing the mask blank to a mask manufacturing department, the mask blank manufacturing department provides optical characteristic information (transmittance variation) of the mask blank transparent substrate and optical characteristic information (transmittance variation and/or phase difference variation) of the mask blank to the mask manufacturing department. The optical characteristic information of the mask blank transparent substrate is provided to the mask blank manufacturing department from a materials processing department that manufactures mask blank transparent substrates.
摘要:
An electric vehicle includes a double-sided swing arm that supports a motor shaft, an axle, and a wheel by supporting a motor on one side of the wheel and a reduction mechanism on the other side of the wheel. In this case, the swing arm is composed of, on the one side of the wheel, plural separable arm portions. The arm portions have respective separation points on an outside or outer periphery of the wheel. With the components arranged in this manner, weight balance of the electric vehicle is easily achieved, and the operational efficiency of mounting, removal, and replacement of the wheel and the motor is improved.