| 摘要 |
PROBLEM TO BE SOLVED: To provide a lightweight compact spiral scanning mechanism which enables spherical spiral scanning, and a three-dimensional positioning device which uses the mechanism and has no restriction on view angle without requiring image processing.SOLUTION: A spiral scanning mechanism includes: a hollow worm gear which does not rotate autonomously; a worm wheel to be engaged with the worm gear; a rotation transmission mechanism which rotates an object around an axis parallel to a rotation shaft of the worm wheel and vertical to a rotation axis of the worm gear; a gear box for supporting them so as to be rotated around each of the axes; and a single power device which rotates the gear box in a panning direction. The power device rotates a reflection/refraction device mounted on the gear box integrally in the panning direction. The worm wheel engaged with the worm gear, and the reflection/refraction device are rotated in a tilt direction in this order. When emitted/converged light passing through the hollow worm gear is reflected/refracted by the reflection/refraction device, trajectory thereof draws a spherical spiral shape. |
