Optical scanning device and image forming apparatus equipped with the same

摘要

If inclination correction of scanning line is performed while the incident position of the laser beam is not suitable, the shape of a spot of the laser beam which forms an image on a photosensitive drum may not be uniform depending on the scanning position of the laser beam. The housing is provided with a U-shaped groove to which the convex portion of a lens hold member that holds the lens is engaged. With the position of the convex portion adjusted, the convex portion is attached and secured in the U-shaped groove. Thus, the installation position of the lens to an optical path of the laser beam is adjusted, and the lens can be rotated and adjusted in order to correct an inclination or a bending of scanning line.

主权项

1. An optical scanning device comprising:
a light source configured to emit a laser beam to expose an image bearing member; a deflect unit configured to deflect the laser beam such that the laser beam scans the image bearing member; a lens configured to guide the deflected laser beam to the image bearing member; a first unit configured to hold the lens; a second unit connected to the first unit at one end of the lens in a longitudinal direction of the lens; a first moving unit disposed at an other end of the lens in the longitudinal direction of the lens and configured to rotate the first unit around an axis parallel to an optical axis of the lens by using a contact point between the first unit and the second unit as a fulcrum; a second moving unit configured to connect the first unit and the second unit to rotate the first unit around the longitudinal direction of the lens; and a housing configured to contain the first unit, the second unit, the first moving unit and the second moving unit, wherein the second unit and the housing include an adjustment mechanism disposed at the one end of the lens in the longitudinal direction of the lens, the adjustment mechanism being configured to adjust a position at which the second unit is to be fixed to the housing, wherein the second moving unit rotates the first unit around the longitudinal direction of the lens with respect to the second unit, wherein the adjustment mechanism includes a convex portion disposed on the second unit and an engaging portion disposed on the housing, the convex portion being configured to movably engage to the engaging portion, wherein the engaging portion is configured to restrict movement of the convex portion such that a position of the second unit with respect to the housing is adjustable in a direction perpendicular to both the optical axis direction and the longitudinal direction of the lens, and the position of the second unit with respect to the housing is not adjustable in the optical axis direction, and wherein, after the position of the second unit is adjusted with respect to the housing, the convex portion is fixed to the engaging portion.