Abstract
A polygon mirror is one of the important optical scanning components for a laser beam printer, a copy machine and so on. It has the serious troubles related to the fluid dynamic flow structures such as high frequency noise, frosted mirror and jittering of the rotating mirror under high rotating speed condition. The flow structures around the rotating polygon mirror were investigated by the flow visualization using a Particle Image Velocimetry and the velocity measurement using a Laser Doppler Velocimetry. As the results, significant flow structures were clarified and associated with these troubles. The first is the periodical fluctuating structure, which induces the high frequency noise, showing as a bow-shaped region and a pair of the vortex tubes. The second is an alternative flow structure shedding from near the polygon mirror, which is considered as one of the causes of the jittering. In addition, this flow accompanies the complicated three-dimensional vortices on the outskirts of the alternative flow structure. The third is the sinking flow structure toward the polygon mirror contributing the frosted mirror trouble.
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