# US 2020/0401063 A1 · Image forming apparatus

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- Number: US 2020/0401063 A1
- Document ID: US20200401063A1
- Status: Published application
- Kind: A1
- Application number: 16/905,786
- Filed: 2020-06-18
- Published: 2020-12-24
- Earliest claimed: 2019-06-21
- Assignees: KYOCERA Document Solutions Inc.
- Applicants: KYOCERA Document Solutions Inc.
- Inventors: Hironori Yamauchi
- Web page: https://patentgrep.com/patent/US20200401063A1

## CPC

- G03G 15/043: with means for controlling illumination or exposure (G03G15/041 takes precedence)
- G03G 15/04045: {for exposing image information provided otherwise than by directly projecting the original image onto the photoconductive recording material, e.g. digital copiers (G03G15/041, G03G15/043 take precedence)}
- G03G 21/1666: {for the exposure unit}
- G03G 15/04054: {by LED arrays}
- G03G 15/04072: {by laser}
- G03G: ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY

## Abstract

An image forming apparatus includes a photoconductor drum, a charging device, an exposure device, a development device, and an exposure position changing unit. The charging device is configured to charge the photoconductor drum. The exposure device is configured to irradiate the photoconductor drum and thereby form an electrostatic latent image on the photoconductor drum. The development device is configured to cause toner to adhere to the electrostatic latent image on the photoconductor drum in a two-component-development manner. The exposure position changing unit is configured to change, on the photoconductor drum, an exposure position of the exposure device to a position getting close to the development device from an exposure position for print image development when electric power cutoff is detected.

## Claims

### Claim 1

An image forming apparatus, comprising:
a photoconductor drum;
a charging device configured to charge the photoconductor drum;
an exposure device configured to irradiate the photoconductor drum and thereby form an electrostatic latent image on the photoconductor drum;
a development device configured to cause toner to adhere to the electrostatic latent image on the photoconductor drum in a two-component-development manner; and
an exposure position changing unit configured to change, on the photoconductor drum, an exposure position of the exposure device to a position getting close to the development device from an exposure position for print image development when electric power cutoff is detected.

### Claim 2 (depends on 1)

The image forming apparatus according claim 1, wherein the exposure position changing unit changes a position or a direction of a light source of the exposure device, and thereby changes the exposure position to the position getting close to the development device from the exposure position for print image development.

### Claim 3 (depends on 2)

The image forming apparatus according claim 2, further comprising:
a driver circuit configured to drive the exposure position changing unit; and
a controller configured to control the driver circuit;
wherein the exposure position changing unit comprises a solenoid configured to provide electromagnetic force to the light source such that the direction of the light source gets a predetermined direction for print image development; and
the controller (a) causes electric current to flow through the solenoid using the driver circuit and thereby causes the solenoid to provide electromagnetic force to the light source such that the direction of the light source gets the predetermined direction for print image development, and (b) when electric power cutoff is detected, immediately removes the electromagnetic force by stopping the electric current using the driver circuit and thereby changes the direction of the light source.