Image forming apparatus with structure for suppressing position variation of exposure unit caused by vibrations generated therein

An image forming apparatus, comprising:

• a photosensitive member;
• an exposure unit configured to emit a light beam based on image data to form an electrostatic latent image on the photosensitive member;
• a placement unit configured to support the exposure unit, wherein the placement unit is fixed to a body of the image forming apparatus;
• an elastic member placed on the placement unit, the exposure unit being placed on the elastic member so that the elastic member is disposed between the exposure unit and the placement unit;
• and
• a positioning member fixed to the body of the image forming apparatus and configured to be in contact with the exposure unit so that the elastic member is pressed by the exposure unit toward the placement unit, wherein a position of the exposure unit in a direction of gravity is regulated by the positioning member,
• wherein the body of the image forming apparatus includes a first side plate and a second side plate, the placement unit connects the first side plate and the second side plate, and the positioning member is fixed to the first side plate, and
• wherein the placement unit is fixed to the first side plate with a first screw, the positioning member is fixed to the first side plate by use of a second screw different from the first screw, and the second screw is located on the first side plate above the first screw in the direction of gravity.

An image forming apparatus, comprising:

• an image bearing member;
• a latent image forming unit configured to emit a light beam based on image data and to form an electrostatic latent image on the image bearing member by the light beam;
• a placement unit fixed in a main body of the image forming apparatus, on which the latent image forming unit is placed;
• an elastic member disposed between the latent image forming unit and the placement unit;
• a pressing unit provided in the main body of the image forming apparatus and configured to press the latent image forming unit toward the placement unit so that the elastic member is pressed by the latent image forming unit and the placement unit;
• and
• an adjustment unit configured to adjust a compression amount of the elastic member in a direction of gravity, wherein the adjustment unit includes
• a cam configured to be brought into contact with the elastic member and to convert a movement in a horizontal direction into a movement in the direction of gravity, and
• a movement amount changing unit mounted on the placement unit so as to be brought into contact with the cam and configured to change the movement of the cam in the horizontal direction.