Laser scanning unit, image forming apparatus, and one and two-point supports for mirrors and lenses

A laser scanning unit, comprising:

• a housing;
• a laser scanner which is arranged inside the housing and scans a plurality of laser light beams along a first direction;
• a plurality of mirrors which are arranged inside the housing along the first direction and respectively reflect the plurality of laser light beams;
• a plurality of lenses which are arranged inside the housing along the first direction and through which the plurality of laser light beams respectively pass;
• a plurality of mirror fastening members which respectively fasten both end portions of the plurality of mirrors in the first direction to a plurality of mirror support portions that are each a part of the housing;
• and
• a plurality of lens fastening members which respectively fasten both end portions of the plurality of lenses in the first direction to a plurality of lens support portions that are each a part of the housing, wherein
• the plurality of mirrors and the plurality of lenses are arranged alternately with intervals in a second direction intersecting with the first direction,
• the plurality of mirror support portions include:
• a plurality of two-point mirror support portions that each support two positions of a mirror specific surface that is a reflection surface or a back surface opposite to the reflection surface at an end portion of each of the plurality of mirrors on a first side of the first direction;
• and
• a plurality of one-point mirror support portions that each support one position of the mirror specific surface or an end surface at an end portion of each of the plurality of mirrors on a second side of the first direction,
• the plurality of lens support portions include:
• a plurality of two-point lens support portions that each support two positions of a lens specific surface that is a light incidence surface or a light-emitting surface of the plurality of laser light beams at an end portion of each of the plurality of lenses on the second side of the first direction;
• and
• a plurality of one-point lens support portions that each support one position of the lens specific surface of each of the plurality of lenses at an end portion on the first side of the first direction, and
• the plurality of lenses are four lenses respectively corresponding to four development colors, the plurality of lens fastening members are eight lens fastening members that fasten both end portions of the four lenses, and the eight lens fastening members include two first lens fastening members of a first shape corresponding to one of the four lenses and six second lens fastening members of a second shape corresponding to remaining three of the four lenses.