Patent ID: 6700947
Filing Date: 2004-03-02
Classification: A61B,G01N,H04B

Abstract:
An apparatus for transmitting a light beam modulated in accordance with data to be transmitted between a rotor and a stator, the rotor and the stator facing each other with a gap therebetween, and the rotor being rotated along a rotor plane, the apparatus comprising:a plurality of light-emitting elements configured to emit light beams in accordance with the data to be transmitted, the light-emitting elements being mounted on the rotor and arranged on a first reference circle on the rotor plane; a photo-detecting element configured to sequentially detect the light beams emitted from the plurality of light-emitting elements, the photo-detecting element being mounted on the stator and arranged on a second reference circle different from the first reference circle and coaxial with the first reference circle so as to face the rotor plane; and an optical guide member configured to guide at least one of the light beams emitted from the light-emitting elements to the photo-detecting element, the optical guide member being arranged in the gap between the stator and the rotor, made of a transparent material, and fixed to one of the stator and the rotor.