Patent ID: 8472097

Claim:
An optical scanning apparatus, comprising: a light source; an optical deflector that reflects and deflects a light beam from the light source; a lens installed in a reflection direction of the optical deflector and through which the light beam reflected by the optical deflector passes; a reflective mirror group which is installed in accordance with the light source and guides the light beam having passed through the lens; and an image bearing member on which the light beam having been emitted from the light source and having passed through the reflective mirror group forms an image, wherein the reflective mirror group comprises a third reflective mirror that reflects the light beam having passed through the lens toward the image bearing member, the third reflective mirror and the image bearing member are arranged opposing each other across an optical path reflected by the optical deflector and passing through the lens, the lens comprises a set of two fθ lenses differing in an optical property from each other, and the set of two fθ lenses and the third reflective mirror are disposed such that the light beam having been reflected by the optical deflector and passing in series the set of two fθ lenses is reflected by the third reflective mirror and passes a space between the set of two fθ lenses.