Patent ID: 9151899
Filing Date: 2015-10-06
Classification: G01N,G02B

Abstract:
1. An optical fiber head comprising: an elongated, columnar optical fiber comprising a leading end surface in a leading end portion in an axial direction, light exiting from and being incident on the leading end surface; a substantially columnar lens disposed so as to be opposed to the leading end surface of the optical fiber; and a case body comprising a front end and a rear end in the axial direction, the leading end portion of the optical fiber and the lens being accommodated in the case body, the optical fiber being drawn from the rear end of the case body, wherein a blocking unit, a lens inserting hole, and an optical fiber inserting hole are sequentially provided in the case body from the front end to the rear end, an opening through which the light is projected or received being formed in the blocking unit, the lens being inserted in the lens inserting hole, the leading end portion of the optical fiber being inserted in the optical fiber inserting hole, an inner diameter of the lens inserting hole is larger than a diameter of the opening and is smaller than an inner diameter of the optical fiber inserting hole, a length in the axial direction of the lens is longer than a length in the axial direction of the lens inserting hole, and the leading end portion of the optical fiber is fixed to the case body while the leading end surface of the optical fiber abuts on a rear end surface of the lens by inserting the lens in the lens inserting hole, and the leading end portion of the optical fiber in the optical fiber inserting hole, so that the lens is fixed to the case body by being sandwiched between the blocking unit and the optical fiber in the axial direction.