| 摘要 |
A rotary light coupler comprises a first light emitter and a first light receiver mounted on a fixed body, and a second light emitter and a second light receiver mounted on a rotary body. The first and the second light emitters are arranged to transmit light beams containing signals to the second and the first light receivers respectively, through a rotary mechanism. The first and the second light receivers are placed opposing each other along the direction of the axis of rotation of the rotary body. The first and the second light emitters are placed respectively at the radially outside of the first and the second light receivers. Light axes of the first and the second light emitters are set in such a manner that they direct toward the central portions of the second and the first light receivers respectively and that reflected lights from the second and the first light receivers do not come into the first and the second light receivers respectively. A set of the first light receiver and the first light emitter and a set of the second light receiver and the second light emitter are disposed in such a manner that they do not mechanically interfere with each other when they rotate relatively with each other.
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