Rotatable polygon mirror, optical deflecting device, scanning optical device, and image forming apparatus
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United States of America Patent
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Dec 5, 2023
Grant Date -
Nov 24, 2022
app pub date -
May 20, 2022
filing date -
May 24, 2021
priority date (Note) -
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Abstract
A rotatable polygon mirror including a plurality of reflecting surfaces includes first and second surfaces connecting to the reflecting surfaces provided on opposite ends, first and second protrusion portions with an annular shape, provided on the first and second surfaces and protruding inversely to each other in the rotational axis direction, about a rotational axis of the rotatable polygon mirror. A height of a top surface portion of the first protrusion portion from the first surface is higher than that of a top surface portion of the second protrusion portion from the second surface with respect to the rotational axis direction. In a case that the rotatable polygon mirrors are stacked in the rotational axis direction, a wall of an inner peripheral side of the first protrusion portion and a wall of an outer peripheral side of the second protrusion portion are engaged with each other.
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