Patent ID: 7595813

Claim:
An image forming apparatus utilizing electrophotographic technology, comprising: a laser scan unit which is previously adjusted to have a predetermined quality when components thereof are assembled as a unit, the laser scan unit configured as a black box after being assembled with no adjustment, wherein the laser scan unit is fixed on a frame by screws at three fixing portions respectively provided in vicinities of different three faces among a front face, a rear face and side faces of a housing of the laser scan unit made of resin molding, so as to be rotated in a horizontal plane around a vertical rotation axis; at least one adjuster which serves as a spacer to adjust inclination of the laser scan unit with respect to the frame in a vertical plane, wherein the at least one adjuster is attached to a corresponding one of the three fixing portions of the laser scan unit and wherein the at least one adjustor has a coupling portion which faces or contacts one of the front face, the rear face and the side faces of the housing of the laser scan unit, and a pair of engaging portions which are formed at both ends of the coupling portion to protrude perpendicular to the coupling portion in a same direction; and wherein the at least one adjuster is selected from among a plurality of adjusters each of which is formed of a metal plate having a different even thickness, and wherein each of the three fixing portions has a pair of recesses formed on at least one of a top face and a bottom face of the housing of the laser scan unit, wherein a depth of each of the recess is made shallower than a smallest thickness of the metal plate of the at least one adjuster, and the pair of recesses engage the engaging portions of the corresponding adjuster.