An optical scanning device and an image forming apparatus having the same
include a light source, a deflecting system, an imaging optical system
with at least one imaging optical element for imaging a light beam
deflected by the deflecting system on a surface to be scanned, and at
least one reflection type optical element disposed between the imaging
optical element and the scanned surface, wherein the deflected light beam
passes through a first transmission surface and a second transmission
surface of the imaging optical element in this order and, after being
reflected by the reflection type optical element, the light beam then
passes through a third transmission surfaced and a fourth transmission
surface of the imaging optical element in this order, and wherein a
relation |oM/o|<0.1 is satisfied where o is an axial combined power
within a main-scan section of the imaging optical element through which
the light beam passes again, and oM is an axial combined power within a
main-scan section of the reflection type optical element.