US 12,147,032 B1
Optical scanning apparatus and image forming apparatus
Atsushi Sano, Tokyo (JP); and Jun Nagatoshi, Tokyo (JP)
Assigned to Canon Kabushiki Kaisha, Tokyo (JP)
Filed by CANON KABUSHIKI KAISHA, Tokyo (JP)
Filed on Jun. 26, 2023, as Appl. No. 18/341,715.
Application 18/341,715 is a division of application No. 16/925,986, filed on Jul. 10, 2020, granted, now 11,726,316.
Claims priority of application No. 2019-141403 (JP), filed on Jul. 31, 2019.
Int. Cl. G02B 26/12 (2006.01); G02B 26/10 (2006.01); G03G 15/00 (2006.01); G03G 15/30 (2006.01)
CPC G02B 26/122 (2013.01) [G02B 26/105 (2013.01); G03G 15/305 (2013.01); G03G 15/50 (2013.01)] 5 Claims
OG exemplary drawing
 
1. An optical scanning apparatus comprising:
a first light source;
a second light source;
a rotatable polygonal mirror configured to reflect and deflect first laser light emitted from said first light source and second laser light emitted from said second light source, said rotatable polygonal mirror reflecting the second laser light in a direction opposite to a reflection direction of the first laser light;
a motor configured to rotationally drive said rotatable polygonal mirror;
a first mirror configured to reflect the first laser light deflected by said rotatable polygonal mirror and configured to guide the reflected first laser light to a first surface-to-be-scanned;
a second mirror configured to reflect the second laser light deflected by said rotatable polygonal mirror and configured to guide the reflected second laser light to a second surface-to-be-scanned;
a first lens configured to image the first laser light deflected by said rotatable polygonal mirror on said first surface-to-be-scanned;
a second lens configured to image the second laser light deflected by said rotatable polygonal mirror on said second surface-to-be-scanned; and
a casing accommodating said rotatable polygonal mirror, said motor, said first and second mirrors and said first and second lenses, wherein said casing includes an accommodating portion including a top wall provided with a mounting surface on which said motor is mounted, a first side wall opposing one end portion of said first lens with respect to a longitudinal direction of said first lens, a second side wall opposing the other end portion of said first lens with respect to the longitudinal direction, and an opening, and includes a cover portion configured to cover said opening, of said accommodating portion, provided at a position opposing said mounting surface,
wherein in a mounting range of said top wall of said accommodating portion in which said motor, said first and second mirrors and said first and second lenses are mounted with respect to a perpendicular direction perpendicular to both a rotational axis direction of said motor and the longitudinal direction of said first lens, at least one curved portion having a shape such that a part of said top wall projects so that said mounting surface approaches said opening is provided,
wherein with respect to the longitudinal direction of said first lens, said curved portion has a length equal to a gap between said first side wall and said second side wall,
wherein said top wall includes a recess on a surface opposite from said mounting surface at a portion corresponding to said curved portion,
wherein said cover includes a first portion through which the first laser light passes and a second portion through which the second laser light passes, and
wherein with respect to the rotational axis direction, a top end portion of said curved portion on an opening side of said casing, a reflecting surface of said rotatable polygonal mirror, and the first and second portions of said cover, are arranged in this order.