OPTICAL SCANNER CONFIGURED SO A PRINCIPAL RAY OF AN INCIDENT BEAM FROM A LIGHT SOURCE TO A DEFLECTOR AND A PRINCIPAL RAY OF A SCANNING BEAM FROM THE DEFLECTOR TO A SCANNED SURFACE TRAVEL ON OPPOSITE SIDES OF AN OPTICAL AXIS OF OPTICAL ELEMENT(S) HAVING TRANSMISSIVE SURFACES BOTH CONCAVE TOWARD THE DEFLECTOR IN SUB-SCANNING SECTION, AND IMAGE FORMING APPARATUS USING THE SAME - diagram, schematic, and image 08
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