Abstract: A switch device used for a laser device, includes series-parallel connected switch elements or modules. The switch elements or modules are simultaneously turned on by trigger signals from trigger circuits. The transmission lines for connecting the trigger circuits to respective switch elements are equal to one another in length. A protecting circuit is provided for the switch elements, and indicators are provided for indicating the shortcircuit of the switch elements. In the switch device, the number of wires for the switch elements is made small and heat generated from the switch elements is effectively radiated. The modules are easily stacked, and firmly connected to a control unit for controlling the switch elements. A discharge excited laser device using the switch device has a high efficiency and a long lifetime and is reliable.

Abstract: A cylindrical movable member is forcedly fitted into two spaced annular leaf springs and disposed within a main detector body on its longitudinal axis with the lower end of the movable member put in point contact with the bottom of the main body. The leaf springs have outer peripheries fixed to the peripheral wall of the main body. The upper end of the movable member faces an operating rod for a limit switch having a spacing between them.