JPS60209753A - Copying machine - Google Patents
Copying machineInfo
- Publication number
- JPS60209753A JPS60209753A JP59067031A JP6703184A JPS60209753A JP S60209753 A JPS60209753 A JP S60209753A JP 59067031 A JP59067031 A JP 59067031A JP 6703184 A JP6703184 A JP 6703184A JP S60209753 A JPS60209753 A JP S60209753A
- Authority
- JP
- Japan
- Prior art keywords
- temp
- image
- exposure
- drum
- potential
- 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
Links
Classifications
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
- G03G15/00—Apparatus for electrographic processes using a charge pattern
- G03G15/50—Machine control of apparatus for electrographic processes using a charge pattern, e.g. regulating differents parts of the machine, multimode copiers, microprocessor control
- G03G15/5033—Machine control of apparatus for electrographic processes using a charge pattern, e.g. regulating differents parts of the machine, multimode copiers, microprocessor control by measuring the photoconductor characteristics, e.g. temperature, or the characteristics of an image on the photoconductor
- G03G15/5045—Detecting the temperature
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
- G03G2215/00—Apparatus for electrophotographic processes
- G03G2215/00025—Machine control, e.g. regulating different parts of the machine
- G03G2215/00071—Machine control, e.g. regulating different parts of the machine by measuring the photoconductor or its environmental characteristics
- G03G2215/00084—Machine control, e.g. regulating different parts of the machine by measuring the photoconductor or its environmental characteristics the characteristic being the temperature
Landscapes
- Engineering & Computer Science (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Discharging, Photosensitive Material Shape In Electrophotography (AREA)
- Control Or Security For Electrophotography (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は電子写゛真複写磯における像担持体の前露光装
置の露光量を可変とするよう改良を行った複写機に関す
るものである。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a copying machine which has been improved so that the exposure amount of a pre-exposure device for an image carrier in an electrophotographic copying plate can be made variable.
電子写真複′ダ機の像担持体すなわち感光体ドラムの周
面に帯電される表面電位は、感光体の反復使用に件って
徐々に低下する特性を有している。The surface potential charged on the circumferential surface of an image bearing member, that is, a photosensitive drum of an electrophotographic duplicating machine has a characteristic that it gradually decreases as the photosensitive member is repeatedly used.
かかる表面電位の変動は、感光体の繰り返し使用によっ
て生ずる受容電位の低下によるものであって、その結果
、現像によって供給されるトナーの量が減少しコピーさ
れた記録紙上の画像の濃度が低下して例えば細線や文字
の[とび−1あるいは暗黒部に濃度の不足を生したりし
て画質を者しく低Fさせることとなる。Such fluctuations in surface potential are due to a decrease in the receptive potential caused by repeated use of the photoreceptor, and as a result, the amount of toner supplied during development decreases and the density of the copied image on recording paper decreases. For example, this may cause insufficient density in thin lines or characters, or in dark areas, resulting in a noticeably low F of the image quality.
加うるに、特に5e−Te系の感光体ドラムの場合には
、感光体が高温状態となると皓滅夏が増加して受容電位
か低下する傾向にあるので、かがる状態にある感光体に
よっては同一原稿によって一定濃度の画像を連続して得
ることが小米ない場合が起こる。In addition, especially in the case of a 5e-Te type photoreceptor drum, when the photoreceptor is in a high temperature state, the amount of fading increases and the receptive potential tends to decrease. In some cases, it may not be possible to continuously obtain images of a constant density from the same original.
かがる感光体ドラムの表面電位の低下を補う手段として
、該感光体ドラムの周面に形成した、トナー像の濃度を
絶えず光学的に検知し必要に応じトナーの濃度を増減し
て画像の濃度を一定に保ついわゆるトナーコントロール
方式が提案されているが、現像剤に占めるトナーの割合
が増加して周辺機内の汚れを助長するので好ましくなく
、また感光体ドラムの同一原稿における繰り返し回転数
を検知し、その回転数に対応して感光体への帯電電流を
増加しそれによって現像によるトナーの付着量を増加さ
せる方法もあるが、電流値の増大によって有害なオゾン
を多(発生し、さらに帯電用電極のワイヤーを汚損する
等の欠点を有している。As a means of compensating for the decrease in the surface potential of the photoreceptor drum caused by darkening, the density of the toner image formed on the circumferential surface of the photoreceptor drum is constantly optically detected and the density of the toner is increased or decreased as necessary to improve the image quality. A so-called toner control method has been proposed to keep the density constant, but this method is undesirable because it increases the proportion of toner in the developer and promotes dirt in the peripheral device. There is also a method of detecting the rotation speed and increasing the charging current to the photoconductor in response to the rotation speed, thereby increasing the amount of toner adhering to the photoreceptor, but the increase in current value may generate more harmful ozone and This method has drawbacks such as staining the charging electrode wire.
また感光体ドラムにおける表面電位の変動を最小限;こ
抑制するために、感光体の繰り返し特性や温度特性に厳
しい規格を設けると、感光体ドラム製作の良品率が着し
く低下して複写機そのものを高価なものとすることにな
る。In addition, if strict standards are set for the repeatability and temperature characteristics of the photoreceptor in order to minimize fluctuations in the surface potential of the photoreceptor drum, the quality of the photoreceptor drum production will drop steadily and the copying machine itself will suffer. This will make it expensive.
一方、感光体ドラムの表面電位は、帯電に先行して行な
われる均一・な全面露光いわゆる110露光によって抑
制され平均化されることも周知であるが、従来使用して
いるタングステンランプあるいは着色蛍光灯等の光源で
は、露光量に対応した印加電圧の制御が難しくまたこれ
らの光源は高熱を発して複写機内の温度を上昇させる弊
害をも伴っていて実用に即しないものであった。On the other hand, it is well known that the surface potential of the photoreceptor drum is suppressed and averaged by a uniform full-surface exposure, so-called 110 exposure, performed prior to charging. With such light sources, it is difficult to control the applied voltage corresponding to the amount of exposure, and these light sources also have the disadvantage of emitting high heat and increasing the temperature inside the copying machine, making them impractical.
〔発明の目的〕
本発明は、感光体ドラムの周面における表面電位を一定
に保つことによって常に安定した濃度の複写画像を得る
ことの出来る複′す代の提(Jl、を[!的としたもの
である。[Object of the Invention] The present invention aims to provide a copying distance (Jl) that can always obtain a copied image with a stable density by keeping the surface potential on the circumferential surface of a photosensitive drum constant. This is what I did.
本発明は、感光体ドラl、の市露尼装置の光源として例
えば発光グイオート゛を使用し、!)η記感光体ドラム
における感光体の温度に応して前記発光ダイオードの輝
度を変化しそれによって111記感光体の表面電位を一
定に保つよう構成するもので、それは、像担持体と、像
担持体:こ画1争を形成し、+’+ii記画像を転写し
た後、画像形成l’l!j :二像担持体にj1j露光
を与える複写俄において、11i記像孔1持体面の温度
を検知して前露光装置の露光量を変化させることを特徴
とする複写機によって達成される。The present invention uses, for example, a light-emitting device as a light source for an exposure device for a photoreceptor drum. ) The luminance of the light emitting diode is changed according to the temperature of the photoreceptor in the photoreceptor drum 111, thereby keeping the surface potential of the photoreceptor 111 constant. Support: After forming this image and transferring the +'+ii image, image formation l'l! j: This is achieved by a copying machine characterized by detecting the temperature of the surface of the image hole 1 (11i) and changing the exposure amount of the pre-exposure device during the copying process in which the j1j exposure is applied to the two image carriers.
本発明による一実施例を第1図及び第2図に示す。 An embodiment according to the present invention is shown in FIGS. 1 and 2.
第1図は本発明の複写機lにおける前露光装置の光源2
0の配置を示したもので、像担(9体すなわち感光材体
ドラム2周面の感光体2aの周囲には、帯電極3、現像
装置5、転写・分離の各電極6および7さらに除電極8
、クリーニング装置9の各画像形成手段と、さらに前記
帯電極3と前記クリーニング装置9との間には本発明に
よる前露光光源20が配設されている。FIG. 1 shows a light source 2 of a pre-exposure device in a copying machine 1 of the present invention.
This figure shows the arrangement of image carriers (9 bodies, that is, around the photoconductor 2a on the circumferential surface of the photoconductor drum 2, a charging electrode 3, a developing device 5, transfer/separation electrodes 6 and 7, and Electrode 8
, a pre-exposure light source 20 according to the present invention is disposed between each image forming means of the cleaning device 9 and between the charging electrode 3 and the cleaning device 9.
すなわち、これらの各画像形成手段によって、前記感光
体2aはその時計方向への回転につれて電荷のイ1?電
、原稿りの画像の節電記録、トナー像化、記録紙・\の
転写等の画像形成プロセスを達成し、しかる後クリーニ
ング装置9による残留トナーの除去を経て再び同一原稿
りによる繰り返し画像形成サイクルを反復することとな
るが、ここにおいて前記感光体2a全面は帯電に先立っ
て本発明による前露光光源20によって前露光が行なわ
れるようになっている。That is, by each of these image forming means, the photoreceptor 2a changes in charge as it rotates clockwise. The image forming process such as power-saving recording of the image on the original paper, toner image formation, and transfer of the recording paper/\ is achieved, and after that, the residual toner is removed by the cleaning device 9, and the image forming cycle is repeated again using the same original paper. Here, the entire surface of the photoreceptor 2a is subjected to pre-exposure by the pre-exposure light source 20 according to the present invention prior to charging.
前記前露光光源20は本実施例においては波長570n
mの発光ダイオードアレイにより構成されたもので該前
露光光源20はコンパクトでスペースを要せずまた低価
格にも拘わらず極めて長寿命であって経済性に優れ、か
つ露光量すなわち発光ダイオードの輝度は順方向電流に
よりコントロールすることか′できる。さらに冷光源で
1−J・る・″)ユニ′代内rAa度を上ν1.させな
い等の利点をら−)ものでJ)る。In this embodiment, the pre-exposure light source 20 has a wavelength of 570n.
The pre-exposure light source 20 is compact and does not require space, and despite its low price, it has an extremely long life and is excellent in economic efficiency, and the amount of exposure, that is, the brightness of the light emitting diode. can be controlled by forward current. Furthermore, the cold light source has the advantage of not increasing the internal rAa degree by 1-J.
第2し1は、本発明の洩゛Iジ俄1(二t:けこ1ii
j HI、ζ光元源20の種度制御の一方法を>i’;
したLのて′、感光体ドラム2の表面温度を2(いU
月ある、・はす〜に7、り等の温度センサー40によっ
て検知した温度検知器からの信号に対応し、制御部1よ
了・め定められたプログラムによって電圧変換器をli
j制御して前記露光光源20に則する印加電圧をフン)
・ロール出来るよう構成したものである。The second part is the leakage of the present invention.
j HI, ζ A method of controlling the seedness of the light source 20>i';
Then, the surface temperature of the photoreceptor drum 2 was set to 2 (U).
In response to the signal from the temperature sensor 40 detected by the temperature sensor 40, the voltage converter is activated according to a program determined by the control unit 1.
j) to control the applied voltage according to the exposure light source 20)
・It is configured so that it can be rolled.
すなわち、同−原稿りによる繰り返し画イ1;形成サイ
クルによって変化する感)い・トドラム2の表面温度を
1;(′に検知し感光体2a/+f低温の場合に1′土
前記露光光源20に高電圧を印加し一〇その輝度を高め
感光体2uに対する露光量を大むくすることにょっ−ζ
感光体2aの帯電電位を抑え、感光体2aの温度が上昇
するに従って徐々に露光光1!r’A 20に対する印
加電圧を低下してその輝度を滅し感光体2aに41する
露光量を小さくしてその帯電電位の1氏下足を滅し、結
果的に繰り返しコピーにおける初期と終期にゎたる感光
木2aの温度変化にも拘わらず感光体ドラム2の現像部
電位を一定に保って画像濃度に差が生じないようコント
ロールすることが可能となってシーする。That is, the surface temperature of the drum 2 is detected at 1; By applying a high voltage to 10, its brightness is increased and the amount of exposure to the photoreceptor 2u is greatly reduced.
The charging potential of the photoreceptor 2a is suppressed, and as the temperature of the photoreceptor 2a rises, the exposure light 1! The applied voltage to r'A 20 is lowered to eliminate its brightness, and the amount of exposure applied to the photoreceptor 2a is reduced to eliminate the 1 degrees lower charge potential, resulting in the initial and final stages of repeated copying. It is possible to maintain the potential of the developing portion of the photosensitive drum 2 constant despite the temperature change of the photosensitive wood 2a, and to control the image density so that there is no difference in image density.
これをグラフにて表現すると、第3図(、)に示す如く
(δ光体ドラム2の感光体2aにおける帯電電位は該感
光体ドラム2の温度上昇に伴って低減する特性を有して
いるが、このような温度特性をもつ感光体2aに対して
前述した如き感光体2aの温度変化に伴う前露光光源2
0すなわち発光ダイオードの輝度補正を第2図(a)に
示すように印加電圧(実線表示)を変動させることによ
り行うと、第3図(c)に示す如く、感光体ドラム2の
表面温度に関係せず感光体2aの現像部電位をほぼ一定
のレベルに保つことを可能としている。Expressing this in a graph, as shown in FIG. However, for the photoconductor 2a having such temperature characteristics, the pre-exposure light source 2 due to the temperature change of the photoconductor 2a as described above
0, that is, when the brightness of the light emitting diode is corrected by varying the applied voltage (indicated by a solid line) as shown in FIG. 2(a), the surface temperature of the photoreceptor drum 2 changes as shown in FIG. 3(c). Regardless of this, it is possible to maintain the potential of the developing portion of the photoreceptor 2a at a substantially constant level.
本発明によって、感大体ドラムの現像部電位は感光体の
温度に関係なく一定に保たれることとなって、常に濃度
の安定した良質の画像を記録することの小米る複写機が
提供されることとなった。According to the present invention, the potential of the developing section of the photosensitive drum is kept constant regardless of the temperature of the photosensitive member, and a copying machine capable of always recording high quality images with stable density is provided. It became a thing.
4.191面の筒中、な説明
第1図は、前露光装置を(litIえた複写機の断面図
。第2図は本発明による市シ)ζ尤尤)1・:1の制御
回路図。第3図は本発明によって改首された:δ尤トド
トラム
2・・・感光体ドラム 2a・・・感光体3・・・4j
’j電極 lj ・・(シ’v 7L )尼1j′系5
・・・現像装置 9・・クリーニング装置20・・冒肖
露光光源 40・・・温度センサー代理人 弁理士 野
1)義 親
第1図
第2図
第3図
呼S,す―イ木ドうム!&良Figure 1 is a sectional view of a copying machine equipped with a pre-exposure device. Figure 2 is a control circuit diagram of a copying machine according to the present invention. Figure 3 has been renamed according to the present invention: δ tram 2...Photoreceptor drum 2a...Photoreceptor 3...4j
'j electrode lj...(shi'v 7L) Ni1j' system 5
Developing device 9 Cleaning device 20 Exposure light source 40 Temperature sensor agent Patent attorney Field 1) Parent-in-law Figure 1 Figure 2 Figure 3 Call S, Sui Thursday Mu! &good
Claims (1)
写した後、画像形成前に像担持体に前露光を与える複写
機において、前記像担持体面の温度を検知して+if露
光装置の露光量を変化させることを特徴とする複写機。an image carrier, an image is formed on the image carrier, and the image is completely
A copying machine that applies pre-exposure to an image carrier after copying and before image formation, wherein the temperature of the surface of the image carrier is detected to change the exposure amount of a +if exposure device.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP59067031A JPS60209753A (en) | 1984-04-03 | 1984-04-03 | Copying machine |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP59067031A JPS60209753A (en) | 1984-04-03 | 1984-04-03 | Copying machine |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS60209753A true JPS60209753A (en) | 1985-10-22 |
Family
ID=13333097
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP59067031A Pending JPS60209753A (en) | 1984-04-03 | 1984-04-03 | Copying machine |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS60209753A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS62209567A (en) * | 1986-03-11 | 1987-09-14 | Konishiroku Photo Ind Co Ltd | Electrophotographic copying device for correction of potential of photosensitive body |
JP2008310311A (en) * | 2007-05-17 | 2008-12-25 | Ricoh Co Ltd | Image forming apparatus, image forming method, and process cartridge |
-
1984
- 1984-04-03 JP JP59067031A patent/JPS60209753A/en active Pending
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS62209567A (en) * | 1986-03-11 | 1987-09-14 | Konishiroku Photo Ind Co Ltd | Electrophotographic copying device for correction of potential of photosensitive body |
JP2008310311A (en) * | 2007-05-17 | 2008-12-25 | Ricoh Co Ltd | Image forming apparatus, image forming method, and process cartridge |
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