JP2011028102A5

JP2011028102A5 - Image forming device

Info

Publication number: JP2011028102A5
Application number: JP2009175489A
Authority: JP
Filing date: 2009-07-28
Publication date: 2012-09-06
Anticipated expiration: 2029-07-28

Description

本発明は、複写機やプリンタ等の電子写真方式或いは静電記録方式の画像形成装置に関し、特に、その感光体に帯電部材を接触もしくは近接させて帯電を行なう帯電装置を備えた画像形成装置に関する。 The present invention relates to an image forming apparatus of an electrophotographic system or an electrostatic recording method, such as a copying machine or a printer, in particular, an image forming equipment having a charging device which performs charging by contacting or close the charging member to the photosensitive member about the.

本発明の目的は、上記課題に対し、感光体の感光層の膜厚検知のために直流電流検出回路を用意することなく、交流電流の電流値を用いて膜厚検知を含む感光体の状態を容易に把握することが可能な画像形成装置を提供することである。 SUMMARY OF THE INVENTION The object of the present invention is to solve the problems described above, the condition of the photoreceptor including the film thickness detection using the current value of the alternating current without preparing the direct current detection circuit for detecting the film thickness of the photosensitive layer of the photoreceptor. that is to provide an image forming equipment which can be easily grasped.

上記目的を達成するために、本発明は、感光体と、前記感光体の表面を帯電する帯電部材と、直流電圧に交流電圧を重畳した帯電電圧を前記帯電部材に印加する帯電手段と、電圧値が異なる各直流電圧に所定の交流電圧を重畳した複数の帯電電圧を複数回にわたって印加するように前記帯電手段を制御する第１の制御手段と、前記帯電手段により複数回にわたって帯電電圧が印加された際に前記帯電部材に流れる各交流電流値を検出する検出手段と、前記検出手段により検出された各交流電流値の差に基づいて、前記感光体の状態の判定を行う第２の制御手段とを備えることを特徴とする。 To achieve the above object, the present invention includes a photosensitive member, wherein a charging member for charging the surface of the photosensitive member, a charging means for applying a charging voltage obtained by superimposing an AC voltage on a DC voltage to the charging member, the voltage A charging voltage is applied a plurality of times by a first control unit that controls the charging unit to apply a plurality of charging voltages in which a predetermined alternating voltage is superimposed on each direct current voltage having different values multiple times Control means for detecting the state of the photosensitive member based on a difference between the detection means for detecting each alternating current value flowing to the charging member and the alternating current value detected by the detection means, And means.

Claims

A photoconductor ,
A charging member for charging the surface of the photosensitive member ;
Charging means for applying to the charging member a charging voltage in which an AC voltage is superimposed on a DC voltage ;
First control means for controlling the charging means to apply a plurality of charging voltages obtained by superimposing a predetermined AC voltage on DC voltages different in voltage value for a plurality of times;
A detection unit that detects each alternating current value flowing to the charging member when the charging voltage is applied a plurality of times by the charging unit;
A second control unit that determines the state of the photosensitive member based on the difference between the alternating current values detected by the detection unit ;
An image forming apparatus comprising:

It further comprises a charge removing means for removing the charge to the photosensitive member,
2. The image forming apparatus according to claim 1, wherein the second control unit controls the discharging unit to discharge the photosensitive member while the detection unit detects each alternating current value. .

The charging unit charges the photosensitive member to be rotationally driven by the charging member to which the charging voltage is applied.
The second control means is configured to receive the first alternating current value detected by the detection means when the first charging voltage is applied by the charging means, and the second control means after the first charging voltage is applied. The state of the photoconductor based on the difference from the second alternating current value detected by the detection means until the photoconductor is rotated once when a second charging voltage different from the first charging voltage is applied. The image forming apparatus according to claim 1, wherein the determination is made.

The second control means determines the state of the film thickness of the photosensitive layer of the photosensitive member based on the difference between the alternating current values detected by the detection means. An image forming apparatus according to any one of the items.

4. The apparatus according to any one of claims 1 to 3, wherein the second control means determines the life of the photosensitive member based on the difference between the alternating current values detected by the detection means. Image forming device.

A photosensitive member, a charging member disposed in contact with or in proximity to the photosensitive member, and charging means for applying a charging voltage obtained by superimposing an AC voltage on a DC voltage to the charging member In an image forming apparatus for uniformly charging the surface of a photosensitive member to a predetermined potential,
First control means for controlling the charging means to apply a plurality of charging voltages obtained by superimposing a predetermined AC voltage on DC voltages different in voltage value for a plurality of times;
A detection unit that detects each alternating current value flowing to the charging member when the charging voltage is applied a plurality of times by the charging unit;
An image forming apparatus comprising: a second control unit configured to change an image forming condition of the image forming apparatus based on a difference between alternating current values detected by the detecting unit;

It further comprises a charge removing means for removing the charge to the photosensitive member,
7. The image forming apparatus according to claim 6, wherein the second control unit controls the discharging unit to discharge the photosensitive member while the detection unit detects each alternating current value. .

The charging unit charges the photosensitive member to be rotationally driven by the charging member to which the charging voltage is applied.
The second control means is configured to receive the first alternating current value detected by the detection means when the first charging voltage is applied by the charging means, and the second control means after the first charging voltage is applied. The image forming condition is set based on the difference between the first charging voltage and a second alternating current value detected by the detecting means until the photosensitive member rotates once when a second charging voltage different from the first charging voltage is applied. 7. The image forming apparatus according to claim 6, wherein the change is made.