Patent ID: 7924428

Claim:
An optical rotary adapter, comprising: a fixed sleeve; a fixed side optical fiber which is fixedly supported by the fixed sleeve and which has at one end thereof an end surface inclined by a predetermined angle 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 rotary cylinder which is supported so as to be rotatable with respect to the fixed sleeve; a rotation side optical fiber which is fixedly supported substantially at the center of the rotary cylinder, which is arranged to face the fixed side collimator lens, and which has an end surface inclined by a predetermined angle 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 rotation drive device which rotationally drives the rotary cylinder; a second luminous flux optical fiber which guides a second luminous flux having a wavelength different from a wavelength of a first luminous flux as a measuring light beam to the inside of the fixed sleeve; a second luminous flux collimator lens which is arranged so as to be separated from the end surface of the second luminous flux optical fiber by a predetermined interval; and a multiplexing device which is provided between the fixed side collimator lens and the rotation side collimator lens in the fixed sleeve, and which multiplexes the first luminous flux and the second luminous flux.