Backlight sopwith staff

The utility model discloses a backlight sopwith staff belongs to mapping equipment technical field. Its technical scheme does: a backlight sopwith staff, includes and the overcoat chi cup joints with the overcoat chi mutually, is cup jointed in proper order by the blade that has a backlight in three section different cross -sections to constitute the endotheca chi, its characterized in that: in setting up the switch return circuit in overcoat chi and endotheca chi, power feed circuit and micro -gap switch circuit. The beneficial effects of the utility model are that: auto -power -off and automatically connect make things convenient for constructor control, save the electric energy, the micro -gap switch circuit of auto -lock or interlocking is used for cutting off and putting through the supply circuit of two section adjacent rulers, makes the backlight of one section ruler being surveyd be in the luminescent state, realize the automation and carried out the power management, prevented excessive power consumption, can automatic display blade vertical position.