Light scanning apparatus and image forming apparatus

A light scanning apparatus, comprising:

• a first holding member configured to hold a first light emitting element configured to emit a first light beam;
• a second holding member configured to hold a second light emitting element configured to emit a second light beam;
• a rotary polygon mirror having a plurality of reflective surfaces, the rotary polygon mirror being configured to deflect the first light beam and the second light beam so that the first light beam is scanned on a first photosensitive member by the plurality of reflective surfaces and the second light beam is scanned on a second photosensitive member by the plurality of reflective surfaces;
• a housing in which the rotary polygon mirror is mounted;
• and
• a mounting member to be mounted on the housing, the mounting member including a first mounting portion on which the first holding member is mounted, and a second mounting portion on which the second holding member is mounted, the second mounting portion being provided adjacent to the first mounting portion to cause the first light beam and the second light beam to enter the same reflective surface among the plurality of reflective surfaces,
• wherein the first holding member is bonded to the mounting member with a photocurable resin adhesive applied to a first application portion provided between the first holding member and the first mounting portion on a side of the second mounting portion,
• wherein the mounting member is provided with a gap formed between the first mounting portion and the second mounting portion to radiate light from between the first mounting portion and the second mounting portion toward the first application portion,
• wherein the first light emitting element and the second light emitting element are arranged in a manner that the first light beam and the second light beam enter the plurality of reflective surfaces from different sides with respect to an imaginary plane that has a normal line corresponding to a rotary shaft of the rotary polygon mirror and passes through the rotary polygon mirror,
• wherein a first lens configured to convert the first light beam into collimated light and a second lens configured to convert the second light beam into collimated light are mounted in the mounting member,
• wherein the first mounting portion has a V-shape including two limbs in a cross section perpendicular to a bisector of an angle formed by an optical axis of the first lens and an optical axis of the second lens,
• wherein the two limbs are opened toward a side opposite to the first holding member, and
• wherein one limb of the two limbs on the side of the second mounting portion is shorter than other limb of the two limbs on a side opposite to the side of the second mounting portion.