Patent ID: 7471021

Claim:
A wiper motor for driving a wiper, the wiper motor comprising: a yoke housing; an armature that is rotatably received in the yoke housing; a gear housing that is connected to the yoke housing; a wheel gear that is rotatably received in the gear housing and decelerates rotation of the armature, wherein the wheel gear has a movable plate, which is secured to an end surface of the wheel gear and has an electrically conductive pattern; an output shaft that is rotatably supported and is driven by a drive force transmitted from the wheel gear, wherein the output shaft is directly or indirectly connected to the wiper; a brush holder device that is installed between the yoke housing and the gear housing, wherein the brush holder device includes: a plurality of brushes that supply electric power to the armature; a holder base that has a brush holder, which holds the plurality of brushes; a connector part that extends outward of the yoke housing from the holder base and is connectable with an external connector to receive an electric signal from the external connector; a contact base that extends from the holder base into an interior of the gear housing through a communication hole, which is formed in a yoke housing side end of the gear housing, wherein the contact base supports a plurality of stationary contacts that are slidably engageable with the electrically conductive pattern of the movable plate, wherein the plurality of stationary contacts is electrically connected and disconnected to the electrically conductive pattern of the movable plate in response to rotation of the wheel gear to stop the wiper at a predetermined position; and a plurality of holder-side conductive lines, wherein at least two of the plurality of holder-side conductive lines provide an electrical connection between the plurality of stationary contacts and the plurality of brushes; and an intermittent drive unit that is installed to the brush holder device, wherein the intermittent drive unit includes an intermittent drive circuit that is electrically connected to the plurality of holder-side conductive lines upon installation of the intermittent drive unit to the brush holder device to intermittently drive the armature through the plurality of brushes based on the electric signal received from the external connector.