| http://www.w3.org/ns/prov#value | - Also, in the above-described example of the prior art, as previously described, a dynamic fluid bearing is used in the bearing portion of the rotatable polygon mirror to thereby cope with the higher speed or the like of the apparatus, but there is a problem still left to be solved that if the pressure force of the leaf spring 33 for assembling the rotatable polygon mirror 34 to the flange 25 is st
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