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Image forming apparatus

一种成像设备、反射构件的技术，应用在应用电荷图形的电记录工艺的设备、电记录术、光学等方向，能够解决输出超出可校正的范围、灰尘变多、灰尘难以去除等问题

Inactive Publication Date: 2009-10-07
SHARP KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, compared with other parts, the dust deposited on the head end of the reflective surface is difficult to remove
[0008] Although the laser output can be corrected as described in Unexamined Japanese Patent Publication No. 2002-248806, the output quickly exceeds the correctable range as dust increases

Method used

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Embodiment Construction

[0027] In the present invention, the reflective member has the shape of an equilateral polygonal column. During the rotation of the reflective member, the laser beam is reflected onto the side of the reflective member, wherein the laser beam is deflected. Specifically, the reflection member is called a polygon mirror. The reflective member has the shape of an equilateral polygonal column. However, the reflective member generally has an elliptical shape in which the height is smaller than the width in the diametrical direction. Aluminum materials are generally used for polygon mirrors because aluminum materials have high reflectivity and the sides of polygon mirrors made of aluminum materials can be processed with high precision. However, the present invention is not limited thereto.

[0028] The polygon motor rotates the polygon mirror such as several thousands to tens of thousands of revolutions per minute according to the specifications of the imaging device. Brushless D...

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Abstract

An image forming apparatus including: a polygon motor that rotates a reflection member; a laser emitting section that emits a laser beam toward a side face of the rotating reflection member; a photoconductor that is scanned by a laser beam reflected from the side face of the reflection member; a beam detecting section that detects a scanning start position of the reflected laser beam, and a scanning final position; and a control section that controls the polygon motor and the laser emitting section, based on detection signals from the beam detecting section, wherein when the detection signal at the scanning start position does not meet a predetermined time-based standard and / or a predetermined output-level standard, the control section controls the polygon motor so that the reflection member rotates in a reverse direction.

Description

technical field [0001] The present invention relates to an imaging device in which a photoconductor is exposed by a laser beam. Background technique [0002] As an electrophotographic image forming apparatus, an apparatus in which the surface of a photoconductor is scanned and exposed by a laser beam has been known. A general structure for scanning a laser beam includes a rotating reflective member (polygon mirror) on which a laser beam emitted from a laser source located at a fixed position is reflected so that it follows The change in reflection angle caused by the rotation is deflected in a predetermined direction, thereby scanning the photoconductor. [0003] If the side (reflective surface) of the polygon mirror becomes dirty due to dust deposits, the reflectivity of the laser beam will decrease, which will affect the image. Thus, there has been proposed a laser exposure apparatus that detects the intensity of a laser beam that has passed through an optical component ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G03G15/04G03G15/00G02B26/12
CPCG03G15/04036G03G15/043G03G2215/0404G03G15/04072G03G15/0435
Inventor 小田步
Owner SHARP KK