Image forming apparatus including duct structure that supports light emitting elements for exposing a photoconductor

Patent metadata

Field	Value
Publication number	US-12399446-B2
Application number	US-202418756140-A
Country	US
Kind code	B2
Filing date	Jun 27, 2024
Priority date	Mar 10, 2022
Publication date	Aug 26, 2025
Grant date	Aug 26, 2025

Abstract

An image forming apparatus includes: a rotatable photoconductor; an exposure portion including a substrate on which a plurality of chips each including a plurality of light emitting portions that emit light for exposing the photoconductor is mounted, and a support portion configured to support the substrate; a fan configured to generate an airflow for cooling the exposure portion; and a duct configured to communicate with the fan and to communicate with the support portion to guide the airflow generated by the fan to the substrate.

First claim

What is claimed is:

1. An image forming apparatus comprising:
a rotatable photoconductor;
an exposure portion including:
a substrate on which a light-emitting chip, including a plurality of light-emitting elements arranged along a rotational axis direction of the photoconductor, is mounted; and
a support portion configured to support the substrate;

a fan configured to generate an airflow for cooling the exposure portion; and
a duct connecting with the fan,
wherein the support portion directs the airflow generated by the fan along a longitudinal direction of the substrate,
wherein the exposure portion is movable between an exposed position where the photoconductor is exposed and a retracted position where the photoconductor is retracted from the exposed position,
wherein, in a state where the exposure portion is at the exposure position:
the duct is connected to the support portion,
the fan-generated airflow is directed through the duct, and
a gap between the support portion and the duct is sealed by a seal member, and the support portion and the duct communicate with each other.

2. The image forming apparatus according to claim 1 , further comprising:
a charging portion configured to charge a surface of the photoconductor; and
a developing portion configured to develop a latent image formed on the surface of the photoconductor with toner,
wherein the exposure portion and the duct are located between the charging portion and the developing portion in a direction orthogonal to a rotation axis direction of the photoconductor and a vertical direction.

3. The image forming apparatus according to claim 1 , wherein:
the duct guides the airflow to a second surface of the substrate opposite to a first surface on which the plurality of chips is mounted, and
the airflow guided to the second surface is guided from one side to the other side in a rotation axis direction of the photoconductor.

4. The image forming apparatus according to claim 1 , wherein, in a state where the exposure portion is located at the retracted position:
the gap exists between the support portion and the duct, and
the support portion and the duct do not communicate with each other.

5. The image forming apparatus according to claim 1 , wherein:
the support portion includes a first opening portion communicating with the duct and provided on one side in a rotation axis direction of the photoconductor and a second opening portion provided on the other side in the rotation axis direction of the photoconductor, and
the first opening portion and the second opening portion communicate with each other.

6. The image forming apparatus according to claim 5 , wherein:
the duct includes a third opening portion provided on one side in the rotation axis direction of the photoconductor and a fourth opening portion provided on the other side in the rotation axis direction of the photoconductor, and
the first opening portion and the third opening portion communicate with each other, and the second opening portion and the fourth opening portion communicate with each other, so that the support portion and the duct communicate with each other.

7. The image forming apparatus according to claim 1 , wherein:
an exterior cover of the image forming apparatus includes a first opening at a position facing the fan, and
the fan generates an airflow for cooling the exposure portion through the first opening.

8. The image forming apparatus according to claim 1 , wherein;
the fan is a first fan,
the image forming apparatus includes a second fan configured to discharge the airflow generated by the first fan to the outside of the image forming apparatus, and
the duct allows the first fan and the second fan to communicate with each other.

9. The image forming apparatus according to claim 1 , further comprising:
a fixing portion that fixes a toner image on a recording medium onto the recording medium,
wherein the fan is located on the opposite side of the fixing portion with respect to the center of the image forming apparatus in a left-right direction.

10. The image forming apparatus according to claim 1 , wherein the plurality of light emitting portions are organic EL.

11. An image forming apparatus comprising:
a rotatable photoconductor;
an exposure portion including:
a substrate on which a light-emitting chip, including a plurality of light-emitting elements arranged along a rotational axis direction of the photoconductor, is mounted; and
a support portion configured to support the substrate;

a fan configured to generate an airflow for cooling the exposure portion; and
a duct connecting with the fan,
wherein the support portion directs the airflow generated by the fan along a longitudinal direction of the substrate,
wherein the exposure portion is movable between an exposed position where the photoconductor is exposed and a retracted position where the photoconductor is retracted from the exposed position,
wherein, in a state where the exposure portion is at the exposure position:
the duct is connected to the support portion, and
the fan-generated airflow is directed through the duct, and

wherein, in a state where the exposure portion is located at the retracted position:
a gap exists between the support portion and the duct, and
the support portion and the duct do not communicate with each other.

12. The image forming apparatus according to claim 11 , further comprising:
a charging portion configured to charge a surface of the photoconductor; and
a developing portion configured to develop a latent image formed on the surface of the photoconductor with toner,
wherein the exposure portion and the duct are located between the charging portion and the developing portion in a direction orthogonal to a rotation axis direction of the photoconductor and a vertical direction.

13. The image forming apparatus according to claim 11 , wherein:
the duct guides the airflow to a second surface of the substrate opposite to a first surface on which the plurality of chips is mounted, and
the airflow guided to the second surface is guided from one side to the other side in a rotation axis direction of the photoconductor.

14. The image forming apparatus according to claim 11 , wherein the plurality of light emitting portions are organic EL.

Assignees

• Canon Kk

Inventors

• Kawasumi Ryoichi
• Ishidate Takehiro
• Takano Hiroki

Classifications

• B41J2/4473

  using liquid crystal [LC] arrays · CPC title

• B41J29/377

  Cooling or ventilating arrangements · CPC title

• G03G2215/0407

  Light-emitting array or panel · CPC title

• G03G2215/0412

  Electroluminescent elements, i.e. EL-array · CPC title

• G03G2221/1645

  for conducting air through the machine, e.g. cooling · CPC title