JPS61145576A - Correcting method of surface potential of photosensitive body - Google Patents

Correcting method of surface potential of photosensitive body

Info

Publication number
JPS61145576A
JPS61145576A JP59271465A JP27146584A JPS61145576A JP S61145576 A JPS61145576 A JP S61145576A JP 59271465 A JP59271465 A JP 59271465A JP 27146584 A JP27146584 A JP 27146584A JP S61145576 A JPS61145576 A JP S61145576A
Authority
JP
Japan
Prior art keywords
photosensitive body
surface potential
fatigue
photoreceptor
degree
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP59271465A
Other languages
Japanese (ja)
Inventor
Takeshi Miyamoto
剛 宮本
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Sharp Corp
Original Assignee
Sharp Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Sharp Corp filed Critical Sharp Corp
Priority to JP59271465A priority Critical patent/JPS61145576A/en
Publication of JPS61145576A publication Critical patent/JPS61145576A/en
Pending legal-status Critical Current

Links

Classifications

    • GPHYSICS
    • G03PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03GELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G21/00Arrangements not provided for by groups G03G13/00 - G03G19/00, e.g. cleaning, elimination of residual charge
    • G03G21/0094Arrangements not provided for by groups G03G13/00 - G03G19/00, e.g. cleaning, elimination of residual charge fatigue treatment of the photoconductor

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Discharging, Photosensitive Material Shape In Electrophotography (AREA)
  • Control Or Security For Electrophotography (AREA)

Abstract

PURPOSE:To hold the surface potential of a photosensitive body which is fatigued according to use constant and to prevent deterioration in picture quality in long-period use by moving and controlling an electrostatic discharger according to the degree of the fatigue of the photosensitive body. CONSTITUTION:The degree of fatigue of the photosensitive body is detected through the detection, etc., of sensors for the counted value of the quantity of copies, counted value of the rotating speed of the photosensitive body, or the surface potential of the photosensitive body, and the discharging lamp 6 is rotated around the shaft 6a through a driving coil 8, solenoid 7, etc., according to the degree of fatigue, so that the lamp 6 leaves an electrostatic charger uniformly. Consequently, the residual charge cancellation time of the photosensitive body becomes long and trap charges are reduced to prevent a decrease in surface potential, thereby holding the surface potential of the photosensitive body constant. therefore, the deterioration of the photosensitive body which is fatigued according to its use is prevented substantially to form an image of good quality even during long-period use.

Description

【発明の詳細な説明】 く技術分野〉 この発明は複写機の使用に伴って疲労する感光体の表面
電位を一定に保つ方法に関する。
DETAILED DESCRIPTION OF THE INVENTION Technical Field The present invention relates to a method of keeping constant the surface potential of a photoreceptor that becomes fatigued with the use of a copying machine.

〈従来技術とその欠点〉 複写機の感光体にはセレン等の感光材が用いられている
が、この感光材は露光、帯電の繰り返しによって光疲労
をおこし、また複写用紙、クリーナとの摩擦によって機
械的な表面疲労を来す。このため、複写機を長期間使用
していると、上記の疲労のために感光体の性能が低下し
て一様帯電時の電位が低下し、複写した画像の地力ブリ
や濃度の低下等を来す欠点があった。
<Prior art and its drawbacks> A photosensitive material such as selenium is used in the photoconductor of a copying machine, but this photosensitive material causes optical fatigue due to repeated exposure and charging, and also due to friction with copying paper and cleaners. Causes mechanical surface fatigue. For this reason, when a copying machine is used for a long period of time, the performance of the photoreceptor deteriorates due to the fatigue described above, and the potential during uniform charging decreases, causing blurring and loss of density in the copied images. There were some drawbacks.

〈発明の目的〉 この発明は上記欠点に鑑み、長期間使用のために性能が
低下した感光体の表面電位を一定に保つ表面電位補正方
法を提供することを目的とする。
<Object of the Invention> In view of the above drawbacks, it is an object of the present invention to provide a surface potential correction method for keeping constant the surface potential of a photoreceptor whose performance has deteriorated due to long-term use.

〈発明の構成と効果〉 この発明は、複写機の感光体の疲労を検知し、その疲労
度に応じて除電ランプを移動することを特徴とする。
<Configuration and Effects of the Invention> The present invention is characterized in that fatigue of a photoreceptor of a copying machine is detected, and a static elimination lamp is moved in accordance with the degree of fatigue.

以上の構成によって、この発明によれば、以下の効果を
奏することが出来る。
With the above configuration, according to the present invention, the following effects can be achieved.

複写機の長期間使用による感光体の性能低下によって、
一様帯電時の電位が低下したときに、除電ランプを移動
させることによって、除電光の照射強度を変化させ、又
は、除電光照射から一様帯電までの時間を変化させるこ
とによって、一様帯電時の電位を正常な値に補正するこ
とが出来、これによって感光体の寿命を伸ばすことが出
来る。
Due to the deterioration of photoreceptor performance due to long-term use of copiers,
When the potential during uniform charging decreases, uniform charging can be achieved by moving the static eliminating lamp to change the irradiation intensity of the static eliminating light, or by changing the time from irradiation with the static eliminating light to uniform charging. It is possible to correct the current potential to a normal value, thereby extending the life of the photoreceptor.

〈実施例〉 第2図はこの発明の実施例である表面電位補正方法を実
施する複写機の要部構造図である。感光体1の周囲には
、帯電器2.現像器3.転写チャージャ4.クリーニン
グ層5及び除電ランプ6が設置されている。
<Embodiment> FIG. 2 is a structural diagram of a main part of a copying machine that implements a surface potential correction method according to an embodiment of the present invention. Around the photoreceptor 1, there is a charger 2. Developing device 3. Transfer charger4. A cleaning layer 5 and a static elimination lamp 6 are installed.

第1図は上記複写機の除電ランプG付近の拡大図である
。除電ランプ6は帯電器2付近に設置されているが、こ
の除電ランプ6は回転軸6aを支点に回動自在に支持さ
れており、図示しない制御部及び駆動装置(第3図参照
)によって実線の位置と破線の位置間を移動する。
FIG. 1 is an enlarged view of the vicinity of the static elimination lamp G of the copying machine. The static eliminating lamp 6 is installed near the charger 2, and is rotatably supported around a rotating shaft 6a as a fulcrum. Move between the position and the position of the dashed line.

第3図は上記駆動装置の要部構成図である。この図は第
1図、第2図の裏面からの図である。この駆動装置は駆
動コイル8.ソレノイド7及び駆動回路9で構成され、
駆動回路9が図示しない制御部から除電ランプ移動信号
を受けると、除電ランプ6を前記実線の位置と破線の位
置との間の所定の位置まで移動させるように、電流を駆
動コイル8に印加する。駆動コイル8に印加された電流
による磁力によってソレノイド7は上下に移動する。こ
のソレノイド7は除電ランプ6のレバー6bに接続され
ているため、除電ランプ6は回転軸6aを中心に回転す
ることになる。
FIG. 3 is a block diagram of the main parts of the drive device. This figure is a view from the back side of FIGS. 1 and 2. This drive device includes a drive coil 8. Consists of a solenoid 7 and a drive circuit 9,
When the drive circuit 9 receives a static elimination lamp movement signal from a control section (not shown), a current is applied to the drive coil 8 so as to move the static elimination lamp 6 to a predetermined position between the solid line position and the broken line position. . The solenoid 7 moves up and down by the magnetic force caused by the current applied to the drive coil 8. Since this solenoid 7 is connected to the lever 6b of the static elimination lamp 6, the static elimination lamp 6 rotates around the rotating shaft 6a.

また、前記制御部は複写枚数を計数するカウンタを備え
てお、す、その計数値が一定枚数に達する毎に除電ラン
プ移動信号を形成して駆動回路9に出力する。
Further, the control section includes a counter for counting the number of copies, and each time the count reaches a certain number of copies, it forms a charge removal lamp movement signal and outputs it to the drive circuit 9.

第4図は複写枚数の増加に伴う感光体の一様帯電時の電
位の変化を示す図である。破線は感光体の表面電位の補
正を行わない場合の表面電位の変化を示している。これ
によれば、複写枚数が増加するに従って、表面電位は低
下してゆく。
FIG. 4 is a diagram showing the change in potential when the photoreceptor is uniformly charged as the number of copies increases. The broken line indicates a change in the surface potential of the photoreceptor when the surface potential is not corrected. According to this, as the number of copies increases, the surface potential decreases.

上記の機構を利用して表面電位の補正を行うには、除電
ランプ6を第1図において実線の位置から破線の位置の
方向に回転させて、除電光の照射を弱く且つ照射位置を
一様帯電器2から離す方向にずらす制御を行う。これに
よって、残留電荷のキャンセルに必要な時間をかせぐこ
とが出来、またトラップ電荷を少なくすることができる
。従って、感光体1が劣化するにともなって除電ランプ
6を第1図における時計廻り方向に徐々に回転させるこ
とにより、表面電位の安定化を図ることができる。
In order to correct the surface potential using the above mechanism, the static eliminating lamp 6 is rotated from the solid line position to the broken line position in FIG. Control is performed to shift it away from the charger 2. As a result, the time necessary for canceling the residual charges can be saved, and the amount of trapped charges can be reduced. Therefore, as the photoreceptor 1 deteriorates, by gradually rotating the static elimination lamp 6 in the clockwise direction in FIG. 1, the surface potential can be stabilized.

実線で示したグラフは上述の表面電位の補正制御を行っ
た場合の感光体表面電位の変化を示している。本実施例
では、複写枚数が一定枚数に達する毎に、除電ランプ6
を第1図の破線に示す位置方向に一定の角度だけ回動し
、感光体1に照射される除電光が弱く且つ帯電器2から
離れた位置に照射されるようにしている。そのため、第
4図に示す様に感光体lの表面電位の低下が抑えられ略
一定の電位を保つことが出来る。
The graph shown by the solid line shows the change in the photoreceptor surface potential when the above-mentioned surface potential correction control is performed. In this embodiment, each time the number of copies reaches a certain number, the static elimination lamp 6
is rotated by a certain angle in the position direction shown by the broken line in FIG. Therefore, as shown in FIG. 4, a decrease in the surface potential of the photoreceptor 1 is suppressed and a substantially constant potential can be maintained.

なお、本実施例では除電ランプ6の移動を回転軸6aを
中心に回転移動するように構成したが、除電ランプを感
光体から垂直方向に移動させて、照射の距離を増減する
ことによっても略同様の効果を得ることができ、また、
感光体の周方向に移動させて、帯電器との距離を増減す
ることによっても略同様の効果を得ることが出来る。
In this embodiment, the static eliminating lamp 6 is configured to rotate around the rotating shaft 6a, but the static eliminating lamp 6 can also be moved vertically from the photoreceptor to increase or decrease the irradiation distance. Similar effects can be obtained, and
Substantially the same effect can be obtained by moving the photoreceptor in the circumferential direction and increasing or decreasing the distance to the charger.

感光体の疲労度を検知するために、この実施例では複写
枚数を計数し、その計数値が一定値に達する毎に感光体
が電位の補正を必要とする程度に疲労していると判断し
ているが、この検知方式以外にも、感光体の回転数を計
数する方式、感光体の表面電位を検知するセンサを用い
る方式等によっても感光体の疲労度を検知することがで
きる。
In order to detect the degree of fatigue of the photoreceptor, in this embodiment, the number of copies is counted, and each time the counted value reaches a certain value, it is determined that the photoreceptor is fatigued to the extent that the potential needs to be corrected. However, in addition to this detection method, the degree of fatigue of the photoreceptor can also be detected by a method that counts the number of rotations of the photoreceptor, a method that uses a sensor that detects the surface potential of the photoreceptor, or the like.

【図面の簡単な説明】[Brief explanation of the drawing]

第1図はこの発明に係る感光体の表面電位補正方法を実
施する複写機の除電ランプ付近の拡大図、第2図は上記
複写機の要部構造図、第3図は上記除電ランプの駆動装
置の要部構成図、第4図は上記複写機の複写枚数と感光
体表面電位との関係を示す図である。 l−感光体、  6−除電ランプ、 7−ソレノイド、8−駆動コイル、 9−駆動回路。
FIG. 1 is an enlarged view of the vicinity of the static elimination lamp of a copying machine that implements the method for correcting the surface potential of a photoreceptor according to the present invention, FIG. 2 is a structural diagram of the main parts of the copying machine, and FIG. FIG. 4, which is a block diagram of the main parts of the apparatus, is a diagram showing the relationship between the number of copies made by the copying machine and the surface potential of the photoreceptor. 1-Photoconductor, 6-Static elimination lamp, 7-Solenoid, 8-Drive coil, 9-Drive circuit.

Claims (5)

【特許請求の範囲】[Claims] (1)複写機の感光体の疲労を検知し、その疲労度に応
じて除電ランプを移動することを特徴とする表面電位補
正方法。
(1) A surface potential correction method characterized by detecting fatigue of a photoreceptor of a copying machine and moving a static elimination lamp according to the degree of fatigue.
(2)前記除電ランプを回転移動するようにした特許請
求の範囲第1項記載の表面電位補正方法。
(2) The surface potential correction method according to claim 1, wherein the static elimination lamp is rotated.
(3)前記除電ランプを感光体に対して垂直移動するよ
うにした特許請求の範囲第1項記載の表面電位補正方法
(3) The surface potential correction method according to claim 1, wherein the static elimination lamp is moved perpendicularly to the photoreceptor.
(4)前記除電ランプを感光体に対して周方向に移動す
るようにした特許請求の範囲第1項記載の表面電位補正
方法。
(4) The surface potential correction method according to claim 1, wherein the static elimination lamp is moved in the circumferential direction with respect to the photoreceptor.
(5)感光体の疲労度の検知は複写枚数が一定枚数に達
したかどうかで行う特許請求の範囲第1項〜第4項のい
ずれかに記載する表面電位補正方法。
(5) The surface potential correction method according to any one of claims 1 to 4, wherein the degree of fatigue of the photoreceptor is detected depending on whether the number of copies has reached a certain number.
JP59271465A 1984-12-19 1984-12-19 Correcting method of surface potential of photosensitive body Pending JPS61145576A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP59271465A JPS61145576A (en) 1984-12-19 1984-12-19 Correcting method of surface potential of photosensitive body

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP59271465A JPS61145576A (en) 1984-12-19 1984-12-19 Correcting method of surface potential of photosensitive body

Publications (1)

Publication Number Publication Date
JPS61145576A true JPS61145576A (en) 1986-07-03

Family

ID=17500411

Family Applications (1)

Application Number Title Priority Date Filing Date
JP59271465A Pending JPS61145576A (en) 1984-12-19 1984-12-19 Correcting method of surface potential of photosensitive body

Country Status (1)

Country Link
JP (1) JPS61145576A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63178847U (en) * 1987-05-09 1988-11-18
EP0409184A2 (en) * 1989-07-18 1991-01-23 Mita Industrial Co. Ltd. Image processing equipment
WO1996034321A1 (en) * 1995-04-28 1996-10-31 Imation Corp. Reduction of residual potential and ghosting in a photoconductor

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63178847U (en) * 1987-05-09 1988-11-18
EP0409184A2 (en) * 1989-07-18 1991-01-23 Mita Industrial Co. Ltd. Image processing equipment
WO1996034321A1 (en) * 1995-04-28 1996-10-31 Imation Corp. Reduction of residual potential and ghosting in a photoconductor
EP0917016A1 (en) * 1995-04-28 1999-05-19 Imation Corp. Reduction of residual potential and ghosting in a photoconductor

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