US 11,809,093 B2
Optical scanning device and image forming apparatus
Manabu Matsuo, Sakai (JP); and Takaharu Motoyama, Sakai (JP)
Assigned to SHARP KABUSHIKI KAISHA, Sakai (JP)
Filed by SHARP KABUSHIKI KAISHA, Sakai (JP)
Filed on Dec. 1, 2020, as Appl. No. 17/108,639.
Claims priority of application No. 2019-223123 (JP), filed on Dec. 10, 2019.
Prior Publication US 2021/0173323 A1, Jun. 10, 2021
Int. Cl. G03G 15/04 (2006.01); G02B 26/12 (2006.01)
CPC G03G 15/04036 (2013.01) [G02B 26/124 (2013.01); G03G 15/0409 (2013.01)] 20 Claims
OG exemplary drawing
 
1. An optical scanning device comprising:
a light source;
a beam detector that takes a main scanning start time of a light beam emitted from the light source and deflection-scanned in a predetermined main scanning direction by a deflection-scanning component; and
a light source reflecting mirror that reflects the light beam emitted from the light source toward the deflection-scanning component,
wherein on the light source and the beam detector, an emission side of the light source and a light receiving side of the beam detector face a light-incident side of an fθ lens, which is longest in the main scanning direction,
wherein in the main scanning direction, the light source is arranged on an upstream side in the main scanning direction and the beam detector is arranged on a downstream side in the main scanning direction, or the beam detector is arranged on the upstream side in the main scanning direction and the light source is arranged on the downstream side in the main scanning direction, and
wherein in an orthogonal direction that is orthogonal to both the main scanning direction and a direction of a rotational axis of the deflection-scanning component, the light source reflecting mirror is provided nearer than the fθ lens is to a side of the deflection-scanning component.