Light scanning apparatus and image forming apparatus

A light scanning apparatus, comprising:

• a light source configured to emit a light beam;
• a deflector configured to deflect the light beam to cause the light beam emitted from the light source to scan a photosensitive member;
• an optical member configured to guide the light beam deflected by the deflector to the photosensitive member;
• a housing containing the deflector and the optical member, the housing including a housing engaging portion and a supporting portion configured to support the optical member;
• a leaf spring including a pressing portion and a leaf spring engaging portion, the pressing portion being configured to press the optical member supported by the supporting portion, the leaf spring engaging portion being configured to engage with the housing engaging portion;
• and
• an abutment portion provided on an opposite side to the housing engaging portion across the optical member,
• wherein in a first state in which the housing engaging portion and the leaf spring engaging portion are engaged with each other, the pressing portion presses the optical member supported by the supporting portion and the leaf spring is not in contact with the abutment portion, and wherein in a second state in which the housing engaging portion and the leaf spring engaging portion are not engaged with each other, the optical box and the leaf spring are configured so that the pressing portion and the abutment portion are in contact with each other, and
• wherein, in association with a movement of the leaf spring to move the housing engaging portion and the leaf spring engaging portion from the second state to the first state, the pressing portion is moved from the abutment portion onto the optical member supported by the supporting portion.