A rotating polygon mirror driving apparatus 1, wherein said bearing is {HEAD ~ a dynamic pressure fluid bearing} having {TAIL ~ a herringbone groove} formed in one of said rotational shaft and said bearing sleeve for generating dynamic pressure 
A rotating polygon mirror driving apparatus 1 , wherein said bearing is { HEAD ~ a dynamic pressure fluid bearing } having { TAIL ~ a herringbone groove } formed in one of said rotational shaft and said bearing sleeve for generating dynamic pressure
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