Light scanning apparatus

A light scanning apparatus, comprising:

• a light source configured to emit a light beam;
• a deflector including a rotary polygon mirror configured to deflect the light beam so that the light beam scans a photosensitive member, a motor configured to rotate the rotary polygon mirror, a driving unit configured to drive the motor, and a circuit board on which the motor and the driving unit are mounted;
• a plurality of reflecting mirrors configured to reflect the light beam deflected by the deflector to guide the light beam deflected by the deflector onto the photosensitive member;
• and
• an optical box on which the light source is mounted, the optical box being configured to contain the deflector and the plurality of reflecting mirrors,
• wherein the optical box includes an installation wall on which the deflector is installed and a support wall positioned on a side of the photosensitive member with respect to the rotary polygon mirror, the support wall being provided with a support portion configured to support at least one of the plurality of reflecting mirrors, a stepped portion including a plurality of steps is formed between the installation wall and the support wall, and a thickness of the stepped portion is smaller than a thickness of the installation wall.

A light scanning apparatus, comprising:

• a light source configured to emit a light beam;
• a deflector including a rotary polygon mirror configured to deflect the light beam so that the light beam scans a photosensitive member, a motor configured to rotate the rotary polygon mirror, a driving unit configured to drive the motor, and a circuit board on which the motor and the driving unit are mounted;
• an optical member configured to guide the light beam deflected by the rotary polygon mirror onto the photosensitive member;
• and
• an optical box on which the light source is mounted, the optical box being configured to contain the deflector and the optical member,
• wherein the optical box includes an installation wall on which the deflector is installed, a support wall positioned on a side of the photosensitive member with respect to the rotary polygon mirror, the support wall being provided with a support portion configured to support the optical member, and a stepped portion including at least two steps in a vicinity of the deflector.

A light scanning apparatus, comprising:

• a light source configured to emit a light beam;
• a deflector including a rotary polygon mirror configured to deflect the light beam so that the light beam scans a photosensitive member, a motor configured to rotate the rotary polygon mirror, a driving unit configured to drive the motor, and a circuit board on which the motor and the driving unit are mounted;
• a plurality of reflecting mirrors configured to reflect the light beam deflected by the deflector to guide the light beam deflected by the deflector onto the photosensitive member;
• and
• an optical box configured to contain the deflector and the plurality of reflecting mirrors,
• wherein the optical box includes an installation wall on which the deflector is installed and a support wall positioned on a side of the photosensitive member with respect to the rotary polygon mirror, the support wall being provided with a support portion configured to support at least one of the plurality of reflecting mirrors, and a waveform portion having a waveform in cross-section in a direction directed from the installation wall toward the support wall is formed between the installation wall and the support wall.