Patent ID: 7978315

Claim:
A range finder comprising: a light emitting unit emitting a light pulse; a light receiving unit sensing an incident light pulse; a reflective mirror reflecting the light pulse emitted from the light emitting unit to an outside space and reflecting the light pulse incident from the outside space to the light receiving unit; an actuator configured to move the reflective mirror in a first direction rotating about a vertical axis and a second direction rotating about a horizontal axis; and a controller controlling the light emitting unit and the light receiving unit and driving the actuator, wherein the actuator comprises: a rotation motor unit supporting the reflective mirror to be rotated in the second direction and rotating the reflective mirror in the first direction; a bushing hinge-coupled with the reflective mirror to rotate in the first direction together with the reflective mirror and installed movably in a vertical direction; and a vertical driving unit moving the bushing in the vertical direction, wherein the vertical driving unit comprises a bearing disposed outside the bushing and at least partially overlapping the bushing in the vertical direction, a cam driven shaft coupled with the bearing, and a cam assembly configured to move the cam driven shaft in the vertical direction.