Light scanning unit and image forming apparatus employing the same

An image forming apparatus, comprising:

• a photosensitive medium on which a latent image is formed;
• a charging member to charge the photosensitive medium;
• a light scanning unit to expose the photosensitive medium and to form the latent image thereon, the light scanning unit comprising:
• a base frame comprising a metal material to prevent the base frame from expanding and/or contracting due to an ambient temperature change,
• one or more mounting members provided in the base frame, and
• one or more optical elements mounted on the base frame by the one or more mounting members, the one or more optical elements generating and/or scanning a light beam to form the latent image;
• a developing unit to form a visible image corresponding to the latent image onto the photosensitive medium;
• a transfer unit to transfer the image formed by the developing unit onto a print medium;
• and
• a fusing unit to fuse the image transferred to the print medium.