Optical scanning device and image forming apparatus

An image forming apparatus comprising:

• a plurality of image carriers having respective surfaces to be scanned;
• an optical scanning device that comprises:
• a plurality of light sources each corresponding to one of the plurality of image carriers, the plurality of light sources including first and second light sources that are adjacent to each other;
• a deflector configured to rotate about a rotation axis and deflect light beams emitted from the plurality of light sources, wherein the rotation axis is perpendicular to a direction along which the first and second light sources are arranged;
• a first lens configured to transmit the light beams deflected by the defector;
• and
• a plurality of second lenses configured to guide the light beams transmitted from the first lens to the respective surfaces to be scanned, wherein
• the second lenses are arranged so that a first incident position of a first light beam emitted by the first light source and entering one of the second lenses is closer to the respective surface to be scanned than a second incident position of a second light beam emitted by the second light source and entering another of the second lenses, and
• an incident angle of the second light beam after deflection with respect to an optical axis of the first lens is greater than an incident angle of the first light beam after deflection with respect to the optical axis of the first lens;
• and
• an image forming unit configured to form an image on an image receiving medium using a latent image formed on the respective surface to be scanned.