Drive mechanism of two degrees of freedom

A drive mechanism for transmitting power to a driven body so as to drive the driven body at an operation of two degrees of freedom, comprising:

• a base portion having a center axis;
• a universal joint for tiltably connecting the driven body to the base portion;
• and
• a power transmission unit for transmitting the power to the driven body,
• wherein the universal joint has a first rotational axis orthogonal to the center axis and a second rotational axis orthogonal to the first rotational axis and tiltable about the first rotational axis,
• wherein the driven body is provided to the universal joint so as to be rotated about the second rotational axis,
• wherein the power transmission unit has a pair of link mechanisms which are arranged on both sides with respect to a first imaginary plane including the center axis and the first rotational axis, and
• wherein each of the pair of link mechanisms has a first link member having a base end portion provided to the base portion so as to be rotated about a third rotational axis perpendicular to the first imaginary plane, a second link member having a base end portion connected to a distal end portion of the first link member so as to be rotated about a fourth rotational axis parallel to the third rotational axis, and a third link member which is provided to the driven body so as to be rotated about a fifth rotational axis in a second imaginary plane perpendicular to the second rotational axis and to which a distal end portion of the second link member is provided so as to be rotated about a sixth rotational axis orthogonal to the fifth rotational axis.