Optical scanning device and image forming apparatus

Patent metadata

Field	Value
Publication number	US-9854120-B2
Application number	US-201615350446-A
Country	US
Kind code	B2
Filing date	Nov 14, 2016
Priority date	Nov 18, 2015
Publication date	Dec 26, 2017
Grant date	Dec 26, 2017

Abstract

An optical scanning apparatus includes a deflector for scanningly deflecting a beam; a scanning lens for imaging the beam deflected by the deflector on a surface; a casing for a light source, the deflector and the lens; and an elastic member urging the lens toward the casing along an optical axis. The lens is provided with an abutment at a beam emergent side of the lens, the abutment abutting to the casing, and is provided with a limiting portion at a side opposite from the emergent side, the limiting portion limiting movement in the opposite direction. The elastic member and the limiting portion limits the movement of the lens in the direction opposite to the direction of the lens. When the lens contacts a positioning portion of the casing, a gap is provided between the elastic member and the limiting portion with respect to the direction.

First claim

What is claimed is:

1. A optical scanning apparatus comprising:
a light source;
a deflector configured to scanningly deflect a beam emitted from said light source;
a scanning lens configured to image the beam deflected by said deflector on a surface to be scanned;
a casing accommodating said light source, said deflector and said scanning lens; and
an elastic member urging said scanning lens toward said casing in a direction of an optical axis,
wherein said scanning lens is provided with an abutment surface at a beam emergent side of said scanning lens, said abutment surface abutting to said casing, and is provided with a limiting portion at a side opposite from a beam emergent side, said limiting portion limiting movement of said scanning lens in a direction opposite to a assembling direction of said scanning lens,
wherein said elastic member as well as said limiting portion limits the movement of said scanning lens in the direction opposite to the assembling direction of said scanning lens, and
wherein in a state that said scanning lens contacts a positioning portion of said casing with respect to the assembling direction, a gap is provided between said elastic member and said limiting portion with respect to the assembling direction.

2. An apparatus according to claim 1 , wherein said elastic member is a snap fit member integrally formed with said casing.

3. An optical scanning apparatus comprising:
a light source;
a deflector configured to scanningly deflect a beam emitted from said light source;
a scanning lens configured to image the beam deflected by said deflector on a surface to be scanned;
a casing accommodating said light source, said deflector and said scanning lens; and
an elastic member urging said scanning lens toward said casing in a direction of an optical axis,
wherein said scanning lens is provided with an abutment surface at a beam emergent side of said scanning lens, said abutment surface abutting to said casing, and
wherein a free end portion of said elastic member and a top surface of said scanning lens limit movement of said scanning lens in a direction opposite a assembling direction of said scanning lens, and
wherein in a state that said scanning lens contacts a positioning portion of said casing with respect to the assembling direction, a gap is provided between the free end portion of said elastic member and the top surface of said scanning lens with respect to the assembling direction.

4. An apparatus according to claim 3 , wherein said elastic member is a snap fit member integrally formed with said casing.

5. An optical scanning apparatus comprising:
a light source;
a deflector configured to scanningly deflect a beam emitted from said light source, said deflector including a rotatable polygonal mirror;
a first optical system including at least one lens and configured to direct the beam to a reflecting surface of said rotatable polygonal mirror;
a second optical system including at least one lens, said second optical system being configured to image the beam deflected by said deflector on a surface to be scanned; and
a casing holding at least said first optical system and said second optical system;
wherein said casing is provided with positioning portions provided at positions opposing said first optical system and said second optical system with respect to assembling directions of said lenses, respectively, and configured to position said lenses, said casing is provided with limiting portions at positions opposing said first and second optical systems with respect to the directions opposite the assembling directions, respectively, and configured to limit movement of the lenses of said first and optical systems;
wherein the lenses of said first and second optical systems are provided with engaging portions engaged with limiting portions, respectively, and
wherein a moving direction of the beam on the surface to be scanned by movement of said lens of said first optical system away from said positioning portion is opposite a moving direction of the beam on the surface to be scanned by a movement of said lens of said second optical system away from said positioning portion.

Assignees

• Canon Kk

Inventors

• Tanaka Yoshihiko
• Nagatoshi Jun
• Nishiguchi Tetsuya

Classifications

• H04N2201/0081

  Image reader (H04N2201/0091 - H04N2201/0094 take precedence) · CPC title

• H04N1/113 Primary

  using oscillating or rotating mirrors · CPC title

• H04N1/02895

  Additional elements in the illumination means or cooperating with the illumination means, e.g. filters (H04N1/02885 takes precedence; optical elements other than lenses per se G02B5/00) · CPC title

• H04N1/00549

  Counter-measures for mechanical vibration not otherwise provided for · CPC title

• H04N1/00557

  Connection or assembly of components or elements (H04N1/00538 takes precedence) · CPC title