| 摘要 |
PURPOSE:To conduct a light control with a satisfactory operating sensation by generating a clock pulse by a tough switch and conducting the opening/ closing of a power switch element and the switching of a light-control switch element every input of the clock pulse. CONSTITUTION:A light control circuit 20 conducts the light control of a fluorescent lamp 9 every tough input operating of a tough switch 21 by three steps, quenching, full-light lighting of lighting at 100% of the rating, and phased light- control lighting of lighting by reducing the brightness by one step. The light control circuit 20 is composed of a clock generating part 22 for generating a clock pulse of 1 every tough of the touch switch 21, and a switch drive control part 23 for controlling the opening/closing and switching of second sand third relay contacts 18, 19 successively every input of the clock pulse from the clock pulse generating part 22. Hence, a light control with a satisfactory operating sensation can be conducted. |
