JPS6482801A - Positioning mechanism for waveguide switch - Google Patents

Abstract

PURPOSE:To execute the miniaturization, to execute the lighting and to reduce a power consumption at switching by providing a positioning groove formed on the outer circumferential surface of a waveguide rotating part, a ratchet mechanism and an actuator, matching the ratchet to the positioning groove by the action of the detent torque of the actuator and holding the positioning of the switching of the waveguide. CONSTITUTION:At the step, in which a tip part 10a on the way of the switching of a latch 10 is along a cylinder outer circumferential surface, the tip part 10a reduces the force pressed to the cylinder outer circumferential surface and the sliding friction force of both is reduced. On the other hand, at a joint part 10b, a component force f2 pressed to a latch support 11 side is increased and the stability of the latch 10 at the time sliding is increased. During the rotating action of a waveguide rotating part 5, a latch tip part 10a drops into an adjoining positioning groove 9 while the part slides a positioning groove 9 and the circular outer circumferential surface at a stable fine friction force. At this time, a component force f1 pressed to the positioning groove 9 is increased, and the separation of the tip part 10a due to the oscillation, etc., is prevented. Consequently, the switching of the switching port of a waveguide rotating part is made sufficient by the low power consumption, an electric power is not necessary for the holding and the miniaturizing and lighting can be executed.