A magnetic lens for a charged particle beam device and a charged particle beam device are provided. Alternatively, control gate structures are formed, floating-gate material is deposited, removed, then deposited again to form floating gates on the sidewalls of the control gate structures, and the central parts of the control gate structures are etched to leave control gates with floating gates on one sidewall each. The substrate processing apparatus comprises a table including a rotatable base plate having a plurality of projecting members projected outward, and a rotation driving mechanism that rotates the base plate. The eye movement stimulus protocol uses a target that moves in any direction of the two-dimensional plane and may use a color display or geometric shapes. The nozzles include a plurality of first nozzles which are aligned at first interval with respect to the transport direction and from which first-type ink droplets are jetted, and a plurality of second nozzles which are aligned at second interval with respect to the transport direction and from which second-type ink droplets different from the first-type ink droplets are jetted. The valve member is disposed against the valve seat and is rotatable about the axis for selectively varying a degree of alignment between respective orifices in the valve seat and valve member.