Patent ID: 9709388
Date: 2017-07-18
CPC Classifications: A61B,G01B

Claim:
1. An optical inner surface measuring device configured to observe and measure a target object using an interference optical method, comprising: a tube; an optical fiber built into the tube; at least one light path conversion unit arranged at a leading end side of the optical fiber; a motor having a rotation shaft unit and configured to rotationally drive one or both of the optical fiber and the light path conversion unit; and a displacement detector configured to measure an amount of runout of the rotation shaft unit of the motor, wherein the displacement detector is provided by arranging at least one detection sensor in the tube and facing an outer peripheral surface of the rotation shaft unit, wherein the motor includes a first motor and a second motor arranged behind the first motor, the light path conversion unit includes a first light path conversion unit operated by the first motor and a second light path conversion unit operated by the second motor, the optical fiber includes a fixation-side optical fiber arranged non-rotatably in the tube via a fixture behind the second motor and a rotation-side optical fiber rotating integrally with the rotation shaft unit of the first motor or the second motor, each of the rotation shaft units of the first motor and the second motor has a hollow shape, at least part of the rotation-side optical fiber at the leading end side is inserted into the hollow of the rotation shaft unit of the first motor, and at least part of the rotation-side optical fiber at a back side is fixed to the hollow of the rotation shaft unit of the second motor, the first light path conversion unit is arranged at the leading end side of the second light path conversion unit so as to be rotatable integrally with the rotation shaft unit of the first motor, and the second light path conversion unit is provided at the leading end of the rotation-side optical fiber.