| 摘要 |
An optical rotary adapter is featured by including: a fixed side optical fiber which is fixedly supported by a fixed sleeve and which has an end surface inclined with respect to a plane perpendicular to the optical axis of the optical fiber; a fixed side collimator lens which is arranged to be separated from the inclined end surface of the fixed side optical fiber by a predetermined interval; a rotation side optical fiber which is fixedly supported substantially at the center of a rotatably supported rotary cylinder, which is arranged to face the fixed side collimator lens, and which has an end surface inclined with respect to a plane perpendicular to the optical axis of the fixed side collimator lens; a rotation side collimator lens which is fixedly supported by the rotary cylinder, and which is arranged between the fixed side collimator lens and the rotation side optical fiber so as to be separated from the inclined end surface of the rotation side optical fiber by a predetermined interval; a second luminous flux optical fiber which guides a second luminous flux having a function different from that of a first luminous flux as a measuring light beam to the inside of the fixed sleeve; and a multiplexing device which is provided between the fixed side collimator lens and the rotation side collimator lens, and which multiplexes the first luminous flux with the second luminous flux.
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