| http://www.w3.org/ns/prov#value | - 20110199664Optical scanning device and image forming apparatus - An optical scanning device includes: a light source; a polygon scanner that deflects a light beam output from the light source; and various types of optical elements for focusing the light beam deflected by the polygon scanner onto a desired position on a surface to be scanned, wherein a hole or a thin-walled portion that is provided
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