| 摘要 |
PURPOSE:To eliminate or decrease the deformation of mirror surfaces generated from thermal expansion and centrifugal force at the time of operation of a high-speed scanner by disposing an elastic member consisting of a rubber basis between the shaft part of a revolving shaft and the central hole part or upper surface of a polygon mirror. CONSTITUTION:The elastic member 5 consisting of the rubber basis having a high coefft. of friction is disposed as the stopper of a rotating direction between the inner peripheral surface of the central hole 1d of the polygon mirror 1 and the outer peripheral surface of the revolving shaft 2a positioned in the central hole 1d of the polygon mirror 1 by fitting the member to the revolving shaft 2a. The clamping force of a mounting screw 4 is sufficient with the force to press the reference plane 1b of the polygon mirror 1 closely to the flange part 2A of the revolving shaft and the clamping force on the reference plane 1b is decreased if the structure is formed in such a manner. The distortion of the mirror surfaces 1c by the increased face pressure of the reference plane 1b arising from the temp. rise and centrifugal force at the time of operation of the high-speed scanner is prevented by the decreased clamping force on the reference plane 1b of the polygon mirror 1. |
