Image forming apparatus

Patent metadata

Field	Value
Publication number	US-9671718-B2
Application number	US-201615369052-A
Country	US
Kind code	B2
Filing date	Dec 5, 2016
Priority date	Nov 27, 2014
Publication date	Jun 6, 2017
Grant date	Jun 6, 2017

Abstract

An image forming apparatus includes a light source, an optical deflector, an optical deflector casing, a bearing, and a sound absorption unit. The optical deflector reflects and deflects an optical beam emitted from the light source, having a rotational reflection member disposed on a rotation shaft to perform optical scanning. The optical deflector casing seals a space in which the optical deflector. The bearing rotatably supports the rotation shaft of the rotational reflection member with respect to the optical deflector casing, and includes at least portion exposed to an external space outside the sealed space of the optical deflector casing. The sound absorption unit is disposed opposite the exposed portion of the bearing with the external space therebetween.

First claim

What is claimed is:

1. An image forming apparatus comprising:
a light source;
an optical deflector having a rotational reflection member configured to reflect and deflect an optical beam emitted from the light source, the optical deflector configured to perform optical scanning;
an optical deflector casing configured to seal a space in which the optical deflector is disposed;
a bearing configured to rotatably support a rotation shaft of the rotational reflection member on the optical deflector casing; and
at least one sound absorption unit having an opening and a cavity portion, the at least one sound absorption unit disposed opposite the bearing, with the opening located at a distance from an end of the bearing.

2. The image forming apparatus according to claim 1 , wherein a diameter of the opening is smaller than a diameter of the bearing.

3. The image forming apparatus according to claim 1 , wherein the at least one sound absorption unit and the optical deflector casing are connected via at least one fixation portion.

4. The image forming apparatus according to claim 1 , wherein the at least one sound absorption unit includes:
a metal portion configured to form the opening; and
a resin portion configured to form the cavity portion.

5. The image forming apparatus according to claim 4 , wherein the metal portion configured to form the opening is configured to be screwed to the resin portion to form the cavity portion.

6. The image forming apparatus according to claim 1 , wherein the at least one sound absorption unit includes a short pipe configured to form the opening, and
wherein the short pipe is configured to be inserted into the cavity portion.

7. The image forming apparatus according to claim 1 , wherein the at least one sound absorption unit includes a plurality of sound absorption units.

Assignees

• Ishida Masahiro
• Matsuda Naoki
• Ricoh Co Ltd

Inventors

• Ishida Masahiro
• Matsuda Naoki

Classifications

• G03G15/043 Primary

  with means for controlling illumination or exposure (G03G15/041 takes precedence) · CPC title

• H04N1/113 Primary

  using oscillating or rotating mirrors · CPC title

• B41J29/13

  Cases or covers · CPC title

• B41J29/02

  Framework · CPC title

• B41J29/10

  Sound-deadening devices embodied in machines · CPC title