JPH0693155B2 - Image stabilization method for copiers - Google Patents
Image stabilization method for copiersInfo
- Publication number
- JPH0693155B2 JPH0693155B2 JP60085477A JP8547785A JPH0693155B2 JP H0693155 B2 JPH0693155 B2 JP H0693155B2 JP 60085477 A JP60085477 A JP 60085477A JP 8547785 A JP8547785 A JP 8547785A JP H0693155 B2 JPH0693155 B2 JP H0693155B2
- Authority
- JP
- Japan
- Prior art keywords
- photoconductor
- copying
- image
- copy
- entire surface
- 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.)
- Expired - Lifetime
Links
Classifications
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
- G03G21/00—Arrangements not provided for by groups G03G13/00 - G03G19/00, e.g. cleaning, elimination of residual charge
Description
【発明の詳細な説明】 技術分野 本発明は、複写装置の画質安定化方法、特に高感度感光
体に用いて長さが数メートルにも及ぶ長尺複写物を得ら
れる複写装置の画質安定化方法に関する。Description: TECHNICAL FIELD The present invention relates to a method for stabilizing image quality of a copying machine, and more particularly to stabilizing the image quality of a copying machine which can be used for a high-sensitivity photoconductor to obtain a long copy having a length of several meters. Regarding the method.
従来技術 回転する感光体に帯電し、画像露光を経て静電潜像を形
成し、該潜像を現像部で顕像化し、更に転写し定着して
成る複写工程を経て複写物を得る複写装置は、公知であ
る。この種の装置にあつては、複写工程が休止している
時間が長いと、感光体の疲労が回復し、地肌汚れが生ず
る。この現象は、As2Se3等で構成する高感度感光体を用
いると顕著になり、問題となつていた。2. Description of the Related Art A copying apparatus that obtains a copy through a copying process in which a rotating photoconductor is charged, an electrostatic latent image is formed through image exposure, the latent image is visualized in a developing unit, and then transferred and fixed. Is known. In this type of apparatus, if the copying process is stopped for a long time, the fatigue of the photoconductor is recovered and the background stain occurs. This phenomenon becomes noticeable when using a high-sensitivity photosensitive member composed of As 2 Se 3 or the like, which has been a problem.
この種の問題を解消するため、下記の表の如く、休止時
間更には複写枚数に応じて現像バイアスの出力レベルを
変えることが提案されている。In order to solve this kind of problem, it has been proposed to change the output level of the developing bias according to the rest time and the number of copies as shown in the table below.
この方法によれば、現像バイアスによつて地肌部分への
トナーの付着を押えることにより、複写物の地肌汚れを
殆んどなくなり、画質を好ましい状態で安定化すること
ができる。 According to this method, the development bias suppresses the adhesion of the toner to the background portion, whereby the background stain of the copy is almost eliminated, and the image quality can be stabilized in a preferable state.
ところが、このような方法では１枚の複写物を得る際の
現像バイアスが固定されている。このため、感光体を多
数回転させて例えば5m以上等の長尺複写物を得る複写装
置では、複写物の先端側では現像バイアス不足による地
肌汚れが、後端側では現像バイアス過多による画像と
び、即ち低濃度部分の再現ができなくなる現象が生ずる
という不具合があつた。However, in such a method, the developing bias for obtaining one copy is fixed. Therefore, in a copying machine that obtains a long copy of, for example, 5 m or more by rotating a large number of photoconductors, the leading edge of the copy causes background stain due to insufficient development bias, and the trailing edge causes image skipping due to excessive development bias, That is, there is a problem in that the phenomenon that the low density portion cannot be reproduced occurs.
目的 本発明は、上述した従来の不具合を解消し、複写物の長
さ、大きさに関係なく、地肌汚れ、及び画像とびを防止
するとともに、その防止動作を効率的に行うことのでき
る画質安定化方法を提供することを目的とする。An object of the present invention is to eliminate the above-mentioned conventional problems, prevent the background stain and the image skipping regardless of the length and size of the copy, and stabilize the image quality by efficiently performing the prevention operation. The purpose is to provide a method of conversion.
構成 この目的を本発明は、回転する感光体に帯電し、画像露
光を経て静電潜像を形成し、該潜像を現像部で顕像化
し、更に転写し定着して成る複写工程を経て複写物が得
られ、その際、前記感光体を複数回回転させ、転写紙の
送り方向の長さが数メートルとなる長尺複写物が取得可
能な複写装置において、前記複写工程終了後の複写休止
時間を測定し、該休止時間が所定時間に至った毎に、前
記感光体を前記長尺複写物を得る場合の回転数と同数回
転させ、該回転中に前記感光体に対して画像露光とほぼ
同じ波長で、同じ光量による全面露光を行うことにより
達成した。Structure To this end, the present invention is subjected to a copying process in which a rotating photoconductor is charged, an electrostatic latent image is formed through image exposure, the latent image is visualized in a developing section, and then transferred and fixed. In a copying apparatus capable of obtaining a copy, and at that time, rotating the photoconductor a plurality of times to obtain a long copy having a length of several meters in the transfer direction of the transfer paper, the copy after the copying process is completed. The rest time is measured, and each time the rest time reaches a predetermined time, the photoconductor is rotated by the same number of revolutions as when obtaining the long copy, and during the rotation, image exposure is performed on the photoconductor. It was achieved by performing the entire surface exposure with the same amount of light and at the same wavelength as.
以下、本発明の実施例を添付図面に従つて説明する。Embodiments of the present invention will be described below with reference to the accompanying drawings.
第１図において、符号１は感光体、本例では感光体ドラ
ムであつて、例えばAs2Se3等の高感度感光体である。こ
の感光体ドラム１が図示していない機枠に支承され、矢
印Ａ方向へ回転駆動されるとき、表面が帯電チヤージヤ
ー２によつて帯電される。その帯電部分は、イレーサー
３によつて不用部分を除かれた後、符号４で示す画像露
光が行なわれて静電潜像が形成され、この潜像が現像部
５を通過する際、顕像化されてトナー像となり、転写部
へ到来する。このトナー像と同期して図示していない給
紙装置から矢印Ｂで示す方向より転写紙６が給送され
る。そして、転写チヤージヤー７の作用により、転写紙
６にトナー像が転写され、転写後の転写紙６は分離チヤ
ージヤー８の作用によつて感光体ドラム１から分離され
る。分離後の転写紙６は、矢印Ｃ方向へ搬送され、図示
していない定着部を通過することにより複写物が得られ
る。なお符号7aは転写前除電ランプである。In FIG. 1, reference numeral 1 is a photoconductor, which is a photoconductor drum in this example, which is a high-sensitivity photoconductor such as As 2 Se 3 . When the photosensitive drum 1 is supported by a machine frame (not shown) and is rotationally driven in the direction of arrow A, the surface is charged by the charging charger 2. After the unnecessary portion of the charged portion is removed by the eraser 3, an image exposure shown by reference numeral 4 is performed to form an electrostatic latent image. When the latent image passes through the developing section 5, a visible image is formed. It is turned into a toner image and arrives at the transfer portion. In synchronization with this toner image, the transfer paper 6 is fed from a paper feeding device (not shown) in the direction indicated by arrow B. Then, the toner image is transferred onto the transfer paper 6 by the action of the transfer charge 7, and the transfer paper 6 after the transfer is separated from the photosensitive drum 1 by the action of the separation charge 8. The separated transfer paper 6 is conveyed in the direction of arrow C and passes through a fixing unit (not shown) to obtain a copy. Reference numeral 7a is a pre-transfer charge eliminating lamp.
他方、転写後の感光体ドラム１には、若干のトナーが残
留するが、この残留トナーはクリーニング装置９によつ
て清掃される。清掃後の感光体ドラム１は除電ランプ10
による露光され、ドラム１の残電電位が除去されて次の
複写に備えられる。On the other hand, some toner remains on the photosensitive drum 1 after the transfer, but this residual toner is cleaned by the cleaning device 9. The photoconductor drum 1 after cleaning has the static elimination lamp 10
And the residual electric potential of the drum 1 is removed to prepare for the next copy.
上記構成の複写装置自体は、公知であり、この複写装置
において長尺複写物を得る形式では給紙装置がロール給
紙方式で、原稿を移動中に露光する方式のものが採用さ
れている。The copying apparatus itself having the above-mentioned configuration is known, and in the method of obtaining a long copy in this copying apparatus, a paper feeding apparatus is a roll paper feeding method and an original is exposed during movement.
かく構成する複写装置においては、先に説明したように
感光体の感度が休止時間、リピート枚数等によつて変化
する。第２図は、As2Se3の感光体ドラムを用いた場合の
原稿濃度０・２の部分における地肌電位の変化を示すグ
ラフである。In the copying machine thus constructed, the sensitivity of the photoconductor changes depending on the rest time, the number of repeats, etc., as described above. FIG. 2 is a graph showing the change in the background potential at the original density of 0.2 when the As 2 Se 3 photosensitive drum is used.
なお、グラフの横軸は感光体ドラム１の回転数、縦軸は
連続してドラム30回目の原稿濃度０・２部分の地肌電位
ＶＬ（30）に対し、原稿濃度０・２部分のドラム回転数
Ｘ回目の地肌電位ＶＬ（ｘ）のズレ量ΔＶＬを取り、休
止時間が10時間、２時間、１時間、30分、10分について
表わしている。The horizontal axis of the graph is the number of revolutions of the photosensitive drum 1, and the vertical axis is continuous and the drum of the original density of 0.2 is compared with the background potential V L (30) of the original density of 0.2 at the 30th drum. The deviation amount ΔV L of the background potential V L (x) at the number of rotations X is taken, and the rest time is 10 hours, 2 hours, 1 hour, 30 minutes, and 10 minutes.
第２図のグラフから明らかなように、複写装置の休止時
間が30分以上長くなると、感光体の疲労が回復し、感度
が良好になり過ぎる。また、感度が良好すぎた場合で
も、複写のためドラム１が数回転する間が最つとも大き
く変化する。従つて、同図の下段に示した5mの長尺複写
の場合、第１枚目のときが同一複写物であつても先後端
で顕著な濃度差が生じてしまう。As is clear from the graph of FIG. 2, when the rest time of the copying machine is longer than 30 minutes, the fatigue of the photoconductor is recovered and the sensitivity becomes too good. Further, even when the sensitivity is too good, it changes at most during the several rotations of the drum 1 for copying. Therefore, in the case of the 5 m long copy shown in the lower part of the figure, a noticeable density difference occurs at the front and rear edges even if the first copy is the same copy.
そこで、本発明は複写装置が休止しているとき、感光体
ドラム１を１回転以上させ、その回転中に全面露光を行
なう。この場合の全面露光は、第２図においてズレ量Δ
ＶＬが50V以下になるように光量、光の波長、ドラムの
回転数を選択する。例えば、画像露光とほぼ同じ波長で
同光量を露光する場合、5m程度長尺物複写とほぼ同じ回
転数間行なう。Therefore, according to the present invention, when the copying apparatus is at rest, the photosensitive drum 1 is rotated once or more, and the entire surface is exposed during the rotation. In this case, the entire surface exposure is the deviation amount Δ in FIG.
The amount of light, the wavelength of light, and the number of rotations of the drum are selected so that V L is 50 V or less. For example, when exposing the same amount of light at the same wavelength as the image exposure, it is performed for about 5 m during the same number of revolutions as in copying a long object.
また、全面露光は複写装置が通電状態で休止していると
き、タイマー（図示せず）で休止時間を測定し、所定時
間毎に行なう。例えば、全面露光を上記条件下で行なう
場合には、10分経過する毎に全面露光を行なうことによ
り、ズレ量ΔＶＬを高々＋50V程度に押えられる。また
全面露光の光量を強くすると、感光体ドラムの回転数を
少なくでき、更に全面露光を行なう間隔を１〜２時間程
度と伸ばしても同様の効果が得られる。なお、全面露光
に用いる光は画像露光用光源の直接光または原稿面反射
光、イレースランプ光、除電ランプ光及び転写前除電ラ
ンプ光等の何れを用いてもよく、この場合光源への入力
電圧や他の光量調整手段（絞り）を備え、光量等調整可
能なものが好ましい。また、全面露光用の光源を新たに
設けても何ら差し支えなく、更にはクリーニング前除電
ランプを設け、それを用いてもよい。更にまた、全面露
光を行なうときは、除電、クリーニング、クリーニング
前のチヤージがオンしてもよいが、帯電及び現像はオフ
状態にすることが好都合である。Further, the entire surface exposure is carried out every predetermined time by measuring the rest time with a timer (not shown) when the copying machine is in the energized state and rests. For example, when the whole surface exposure is performed under the above-mentioned conditions, the deviation amount ΔV L can be suppressed to about +50 V at most by performing the whole surface exposure every 10 minutes. Further, if the light amount of the entire surface exposure is increased, the number of rotations of the photosensitive drum can be reduced, and the same effect can be obtained even if the interval for performing the entire surface exposure is extended to about 1 to 2 hours. The light used for the whole surface exposure may be any of direct light from the light source for image exposure, reflected light from the original surface, erase lamp light, charge eliminating lamp light, charge eliminating lamp light before transfer, and the like. It is preferable that the light amount and the like be provided and other light amount adjusting means (aperture) be provided. Further, a light source for whole surface exposure may be newly provided, and a pre-cleaning discharge lamp may be provided and used. Furthermore, when the entire surface is exposed, the charge removal, the cleaning, and the charge before cleaning may be turned on, but it is convenient to turn off the charging and the development.
かくして、休止時間において所定時間毎に全面露光を行
なうことにより、地肌電位を所定範囲、例えばズレ量Δ
ＶＬを50V程度に押えられ、従つて何時複写工程が開始
されても地肌汚れ等を防ぐことができる。Thus, by performing the entire surface exposure every predetermined time during the rest time, the background potential can be adjusted within a predetermined range, for example, the deviation amount Δ.
VL can be suppressed to about 50V, so that the background stain can be prevented no matter what time the copying process is started.
また、通電状態で休止時間が所定時間となつて全面露光
を行なうとき、複写装置の点検等でドア開放されている
場合、安全上の観点からドアスイツチと連動させてドア
スイツチがオフ即ちドアが開放している状態では全面露
光及びそのためのドラム回転をしない。そして、ドアス
イツチがオンし、そのときが既に所定時間を過ぎていれ
ば全面露光を行なうように構成することが好ましい。Also, if the door is opened for inspection of the copying machine when the entire surface exposure is performed for a predetermined time with the power on and the door is open due to safety reasons, the door switch is turned off, that is, the door is opened. In this state, the entire surface exposure and the drum rotation for that are not performed. It is preferable that the door switch is turned on, and if the time has already passed the predetermined time, the entire surface exposure is performed.
かくして、本発明は複写画像の安定化が可能となり、し
かも通常は全面露光を複写装置の休止時間に自動的に行
うので複写処理能力の低下が避けられる。Thus, according to the present invention, it is possible to stabilize the copied image, and moreover, the exposure of the entire surface is normally performed automatically during the down time of the copying apparatus, so that the reduction of the copying processing capability can be avoided.
なお、本発明は第１図に示す複写装置に限らず種々の形
式の装置に適用できる。The present invention is not limited to the copying apparatus shown in FIG. 1 and can be applied to various types of apparatuses.
次に、第１図に示す複写装置を用いて下記の条件で本発
明の実験を行つた結果を付言する。Next, the results of the experiment of the present invention conducted under the following conditions using the copying apparatus shown in FIG.
感光体ドラム１はAs2Se3の高感度感光体、全面露光の波
長は450nm〜650nm、光量ほぼ10μJ/cm2程度で休止時間
が約20分経過する毎に全面露光を行つた。The photoconductor drum 1 was a high-sensitivity As 2 Se 3 photoconductor, the entire surface exposure wavelength was 450 nm to 650 nm, the light amount was about 10 μJ / cm 2 , and the entire surface exposure was performed every about 20 minutes after a rest time.
この結果、ズレ量ΔＶＬを常時50V以下に押えることが
できた。As a result, the deviation amount ΔV L could be constantly suppressed to 50 V or less.
効果 本発明は、上記の如く構成され、感光体の回転中に全面
露光し、感光体の感度をほぼ所定値内に留めるので、複
写濃度ムラがなく安定した画像が得られ、特に、長尺、
大版用の複写装置に全面像領域で複写濃度ムラがなくな
り有利となった。しかも、全面露光は複写休止時間を利
用して行うので、極めて効率的に得られる。Effect The present invention is configured as described above, and since the entire surface is exposed during rotation of the photoconductor and the sensitivity of the photoconductor is kept within a substantially predetermined value, a stable image can be obtained without unevenness in copy density. ,
This is advantageous for large-sized copying machines because there is no unevenness in copy density in the entire image area. Moreover, since the entire surface exposure is performed by utilizing the copying rest time, it can be obtained extremely efficiently.
第１図は本発明が適用される複写装置の説明図、第２図
はドラム回転数と、地肌電位のズレ量との関係を示すグ
ラフである。 １……感光体ドラム ４……画像露光 ５……現像部FIG. 1 is an explanatory view of a copying machine to which the present invention is applied, and FIG. 2 is a graph showing the relationship between the drum rotation speed and the deviation amount of the background potential. 1 ... Photosensitive drum 4 ... Image exposure 5 ... Development unit
───────────────────────────────────────────────────── フロントページの続き (56)参考文献 特開 昭55−93187（ＪＰ，Ａ) 特開 昭56−1956（ＪＰ，Ａ) 特開 昭57−185072（ＪＰ，Ａ) 特開 昭57−120971（ＪＰ，Ａ) 特開 昭57−148782（ＪＰ，Ａ) 特開 昭58−48077（ＪＰ，Ａ) 特開 昭58−122582（ＪＰ，Ａ) 特開 昭58−136060（ＪＰ，Ａ) 特開 昭59−155860（ＪＰ，Ａ) 特開 昭59−160157（ＪＰ，Ａ) 特開 昭60−238866（ＪＰ，Ａ) 特公 平４−56312（ＪＰ，Ｂ２) ─────────────────────────────────────────────────── ─── Continuation of the front page (56) Reference JP-A-55-93187 (JP, A) JP-A-56-1956 (JP, A) JP-A-57-185072 (JP, A) JP-A-57- 120971 (JP, A) JP 57-148782 (JP, A) JP 58-48077 (JP, A) JP 58-122582 (JP, A) JP 58-136060 (JP, A) JP-A-59-155860 (JP, A) JP-A-59-160157 (JP, A) JP-A-60-238866 (JP, A) JP-B-4-56312 (JP, B2)
Claims (1)
静電潜像を形成し、該潜像を現像部で顕像化し、更に転
写し定着して成る複写工程を経て複写物が得られ、その
際、前記感光体を複数回回転させ、転写紙の送り方向の
長さが数メートルとなる長尺複写物が取得可能な複写装
置において、 前記複写工程終了後の複写休止時間を測定し、該休止時
間が所定時間に至った毎に、前記感光体を前記長尺複写
物を得る場合の回転数と同数回転させ、該回転中に前記
感光体に対して画像露光とほぼ同じ波長で、同じ光量に
よる全面露光を行うことを特徴とする複写装置の画質安
定化方法。Claims: 1. A rotating photoconductor is charged, an electrostatic latent image is formed through image exposure, the latent image is visualized in a developing section, and then transferred and fixed. In this case, in a copying apparatus capable of obtaining a long copy having a length of several meters in the feed direction of the transfer paper by rotating the photoconductor a plurality of times, the copying pause time after the copying process is completed. Each time the measurement is performed and the rest time reaches a predetermined time, the photoconductor is rotated by the same number of revolutions as when the long copy is obtained, and during the revolution, the photoexposure is almost the same as the image exposure. A method for stabilizing image quality in a copying machine, which is characterized in that the entire surface is exposed with the same amount of light at a wavelength.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60085477A JPH0693155B2 (en) | 1985-04-23 | 1985-04-23 | Image stabilization method for copiers |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60085477A JPH0693155B2 (en) | 1985-04-23 | 1985-04-23 | Image stabilization method for copiers |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS61245180A JPS61245180A (en) | 1986-10-31 |
| JPH0693155B2 true JPH0693155B2 (en) | 1994-11-16 |
Family
ID=13859988
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP60085477A Expired - Lifetime JPH0693155B2 (en) | 1985-04-23 | 1985-04-23 | Image stabilization method for copiers |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0693155B2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH07109535B2 (en) * | 1987-07-21 | 1995-11-22 | シャープ株式会社 | Method for stabilizing surface potential of electrophotographic photoreceptor |
| JPH0477757A (en) * | 1990-07-19 | 1992-03-11 | Sharp Corp | Method for controlling image forming process |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS57148782A (en) * | 1981-03-10 | 1982-09-14 | Fuji Xerox Co Ltd | Light quantity controlling method for prefatigue lamp of copying machine |
| JPS58122582A (en) * | 1982-01-14 | 1983-07-21 | Sharp Corp | Electrophotographic method |
| JPS58136060A (en) * | 1982-02-08 | 1983-08-12 | Fuji Xerox Co Ltd | Controlling method of copying machine |
| JPS60238866A (en) * | 1984-05-12 | 1985-11-27 | Toshiba Corp | Recording device |
-
1985
- 1985-04-23 JP JP60085477A patent/JPH0693155B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPS61245180A (en) | 1986-10-31 |
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