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