| 摘要 |
PROBLEM TO BE SOLVED: To provide a method and an apparatus for measuring an in-bore shape, which can speedily measure a defect of the in-bore shape or an in-bore surface. SOLUTION: In the method, an annular optical fiber group 3 which projects slit light through a cone prism 5, and an image transmitting optics 8 which receives a ring-shaped optical image guided by the cone prism 5 by using an imaging lens 7 and projects the optical image, are inserted, and the in-bore shape is measured based on irregularity appearing in the ring-shaped optical image due to parallactic viewing. The method is characterized in that the angle between the slit light projected from an inverted cone part 6 and the axis of the cone prism 5 is made different from the angle between the reception light beam of the ring-shaped optical image to the inverted cone part 6 and the axis of the cone prism 5. In the apparatus, a bending part for deciding an incident angle to the cone prism 5 which sets the projection angle of the slit light projected from the inverted cone part 6, is formed at the head section of the annular optical fiber group 3, and the imaging lens 7 having a light-reception angle different from a light-projection angle is disposed behind the cone prism 5. COPYRIGHT: (C)2009,JPO&INPIT
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