Patent ID: 7705261

Claim:
A pull-rotary filter switch, comprising: a rotary switch device having a casing, a fixing seat, a substrate, a pull-rotary button and a contact terminal, wherein the casing has an opening and a through hole respectively formed on two opposite sides thereof, the fixing seat and the substrate is disposed in the casing, the fixing seat has a penetrating hole, a first eccentric hole and a second eccentric hole, the penetrating hole passes through a center portion of the fixing seat, the first eccentric hole and the second eccentric hole both are eccentrically disposed beside the penetrating hole, the substrate has a conductive point and a board hole passing therethrough, the pull-rotary button has a center shaft, an eccentric rod inserted in the first eccentric hole and a contact terminal, the center shaft passing through the penetrating hole and the board hole has a shaft hole, and the contact terminal is disposed on one end of the eccentric rod and is contacted to the conductive point of the substrate; a transmission line passing through the shaft hole, the penetrating hole, the board hole and the through hole in order to electrically connect to the conductive point of the substrate; and a filter electrically connected to the transmission line.