Patent ID: 7724996

Claim:
An optical rotary joint, comprising: a first housing part and a second housing part connected to each other by means of a bearing unit to be rotatable about a rotation axis; a first optical path comprising a first light-waveguide on the first housing part for supplying light, and a second light-waveguide on the second housing part for withdrawing light; a second optical path extending in an opposite direction and comprising a third light-waveguide on the second housing part for supplying light, and a fourth light-waveguide on the first housing part for withdrawing light; in which the second and fourth light-waveguides are disposed along the rotation axis; wherein a first focuser for focusing a light beam emitted by the first light-waveguide onto the end face of the second light-waveguide is provided at the end face of the first light-waveguide; wherein a second focuser for focusing a light beam emitted by the third light-waveguide onto the end face of the fourth light-waveguide is provided at the end face of the third light-waveguide; and wherein the first and second focusers are disposed laterally from the rotation axis at an oblique angle to the rotation axis so that light beams supplied from end faces of the first and third light-waveguides are incident on end faces of the second and fourth light-waveguides, respectively.