An improved vapor generator and control system includes a vaporization chamber for generating superheated vapor from liquid therein and at least one input connectable to liquid supply and adjustable control for controlling input of liquid into the vaporization chamber whereby output of superheated vapor is controllable while the system is in operation. The key equation comprises an errata locator polynomial and an errata evaluator polynomial. The reflecting plate is disposed in the housing, extends on an edge of the slit, and faces the slit. Based on the maximum light amount, an nth light amount which corresponds to a brightness step n is set. The servo loop is constituted of only one serve loop; and the duty ratio of the drive pulses for driving the first switching element is different from the duty ratio of the drive pulses for driving the second switching element from each other in a linked manner. A terminal holder biases the overlapping blades into contact with one another.