Light scanning apparatus, housing, and image forming apparatus

A light scanning apparatus, comprising:

• a light source configured to emit a laser beam;
• a rotary polygon mirror configured to deflect the laser beam emitted from the light source;
• a plurality of optical elements configured to guide, to a photosensitive member, the laser beam deflected by the rotary polygon mirror, the plurality of optical elements including a lens, of the plurality of optical elements, that is closest to the rotary polygon mirror on an optical path of the laser beam deflected by the rotary polygon mirror;
• and
• a housing configured to house the rotary polygon mirror and the plurality of optical elements, the housing including a bottom portion configured to support the rotary polygon mirror and the lens;
• a plurality of support portions formed on the bottom portion and configured to support both ends of the lens in a longitudinal direction of the lens, respectively;
• and
• a groove portion formed in the bottom portion and extending from just below the lens to a second space so that a first space in which the rotary polygon mirror is arranged is communicated with the second space which is opposite to the first space with respect to the lens.

A light scanning apparatus comprising:

• a first light source configured to emit a first laser beam;
• a second light source configured to emit a second laser beam;
• a rotary polygon mirror configured to deflect the first laser beam and the second light beam, the first laser beam and the second light beam being deflected to opposite sides across the rotary polygon mirror, respectively;
• a first plurality of optical elements configured to guide, to a first photosensitive member, the first laser beam deflected by the rotary polygon mirror, the first plurality of optical elements including a first lens, of the first plurality of optical elements, that is closest to the rotary polygon mirror on an optical path of the first laser beam deflected by the rotary polygon mirror;
• a second plurality of optical elements configured to guide, to a second photosensitive member, the second laser beam deflected by the rotary polygon mirror, the second plurality of optical elements including a second lens, of the second plurality of optical elements, that is closest to the rotary polygon mirror on an optical path of the second laser beam deflected by the rotary polygon mirror;
• a housing configured to house the rotary polygon mirror, the first plurality of optical elements, and the second plurality of optical elements, the housing including a bottom portion configured to support the rotary polygon mirror, the first lens, and the second lens;
• a first support portion formed on the bottom portion and configured to support both ends of the first lens in a longitudinal direction of the first lens, respectively;
• a first groove portion formed in the bottom portion and extending from just below the first lens to a second space so that a first space in which the rotary polygon mirror is arranged is communicated with the second space which is opposite to the first space with respect to the first lens;
• a second support portion formed on the bottom portion and configured to support both ends of the second lens in a longitudinal direction of the second lens, respectively;
• and
• a second groove portion formed in the bottom portion and extending from just below the second lens to a fourth space so that a third space in which the rotary polygon mirror is arranged is communicated with the fourth space which is opposite to the third space with respect to the second lens.