Optical scanning device and image forming apparatus including the optical scanning device

An optical scanning device comprising:

• a light source unit having a plurality of light-emitting modules for each emitting a laser beam;
• a polygon mirror which is rotated about a rotational axis extending in an up/down direction to reflect the laser beam emitted from the light source unit and make a circumferential surface of an image carrier scanned in a main scanning direction;
• a first scanning lens for condensing the laser beam reflected by the polygon mirror;
• a second scanning lens for making the laser beam, which has passed through the first scanning lens, form an image on the circumferential surface of the image carrier;
• and
• a container unit for containing the light source unit, the polygon mirror, the first scanning lens, and the second scanning lens, wherein
• each of the light-emitting modules includes;
• a light-emitting element for emitting the laser beam;
• a coupling lens for converting the laser beam emitted from the light-emitting element into a direction generally parallel to the main scanning direction and moreover condensing the laser beam to a sub scanning direction;
• and
• a cylindrical-shaped bracket which extends in an outgoing direction of the laser beam to hold the coupling lens inside, and
• the container unit includes:
• a bottom wall portion extending in a direction perpendicular to the rotational axis;
• and
• a plurality of protruding portions which protrude upward from an upper face of the bottom wall portion, and
• the light-emitting modules are placed in array in the up/down direction between neighboring ones of the protruding portions, and the bracket is fixed to the protruding portions on both sides via adhesive.