| 摘要 |
The projection display apparatus includes rotation regulating elements for inhibiting a rotation of the mount ring in a tightening direction, and a stopper element displaceable between a non-locked position and a locked position, wherein the stopper element is displaced to the non-locked position when the mount ring is rotated to a rotating position in a loosening direction from a predetermined position in the tightening direction, and is displaced to the locked position when the mount ring is rotated to the predetermined position in the tightening direction.
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