Patent ID: 6903856

Claim:
An optical scanning device, comprising: a plurality of scanning optical systems configured to scan different scanning surfaces, each of the scanning optical systems comprising: a light source configured to emit a light flux; a deflector configured to scan the light flux emitted from the light source, wherein the deflector is commonly used in the plurality of scanning optical systems; a plurality of scanning lenses configured to condense the scanned light flux to the scanning surface; an optical path inflection mirror configured to inflect the scanned light flux and to decrease an amount of change in a relative scanning position of each scanning optical system caused by a temperature fluctuation in the plurality of scanning optical systems; an imaging lens including a resin lens having a power in a sub-scanning direction and configured to lead the light flux emitted from the light source to the deflector; and a housing configured to support the light source and imaging lens, wherein the resin lens is directly affixed to the housing, wherein the plurality of scanning optical systems are provided in a sub-scanning direction, wherein a difference in a number of optical path inflection mirrors between two of the plurality of scanning optical systems is set to zero or an even number, and wherein the optical path inflection mirror is non-movable in position and configured among the plurality of scanning lenses.