| 摘要 |
An image inverting device includes an objective mirror which reflects an image light, incident on a rotation axis from a side of the rotation axis, in the direction of the rotation axis, and an inverting unit on which the image light reflected by the objective mirror is incident. The inverting unit is formed of an assembly of an odd number of reflecting mirrors or an optical block having an odd number of reflecting surfaces. The inverting unit reflects the image light such that the light rotates around the rotation axis due to rotation of the unit, and emits the image light in the direction of the rotation axis. A rotation drive device is attached to rotate the objective mirror and the inverting unit respectively around the rotation axis in the same direction such that their respective angular velocities are in a ratio of 2:1.
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