JPH04106573A - Developer replenishing device - Google Patents
Developer replenishing deviceInfo
- Publication number
- JPH04106573A JPH04106573A JP2224616A JP22461690A JPH04106573A JP H04106573 A JPH04106573 A JP H04106573A JP 2224616 A JP2224616 A JP 2224616A JP 22461690 A JP22461690 A JP 22461690A JP H04106573 A JPH04106573 A JP H04106573A
- Authority
- JP
- Japan
- Prior art keywords
- developer
- concn
- signal
- detected
- value
- 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
- 230000003287 optical effect Effects 0.000 abstract description 6
- 239000003086 colorant Substances 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 4
- 238000000034 method Methods 0.000 description 3
- 108091008695 photoreceptors Proteins 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 2
- 238000011109 contamination Methods 0.000 description 2
- 238000007796 conventional method Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
Landscapes
- Printers Or Recording Devices Using Electromagnetic And Radiation Means (AREA)
- Wet Developing In Electrophotography (AREA)
- Dry Development 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、電子写真湿式現像装置における現像液の補給
装置に関するものである。DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a developer replenishing device in an electrophotographic wet type developing device.
［従来の技術〕
電子写真湿式現像装置においては、帯電した感光体に原
稿像を露光して静電潜像を形成し、前記感光体上に現像
液を接触させることにより前記現像液中のトナーを感光
体上に付着させ、潜像を可視像に変える。従って、現像
液中のトナー濃度が変化すると安定した画像の出力がで
きなくなる。[Prior Art] In an electrophotographic wet developing device, an electrostatic latent image is formed by exposing an original image to a charged photoreceptor, and a developer is brought into contact with the photoreceptor to remove toner in the developer. is deposited on the photoreceptor, converting the latent image into a visible image. Therefore, if the toner concentration in the developer changes, it becomes impossible to output a stable image.
この現像液濃度安定化のために従来、現像液中のトナー
濃度を光学的に検出して、その検出値を基準値と比較し
、検出値が基準値より大きい場合は現像液の補給をせず
、検出値が基準値よりも小さいときに現像液の補給を行
うことにより、現像液中のトナー濃度を一定値にする方
法が用いられている。In order to stabilize the developer concentration, conventional methods optically detect the toner concentration in the developer, compare the detected value with a reference value, and if the detected value is greater than the reference value, the developer is refilled. First, a method is used in which the toner concentration in the developer is maintained at a constant value by replenishing the developer when the detected value is smaller than a reference value.
そして２色以上の現像液を用いた電子写真カラー湿式現
像装置においては、例えば３色の現像液としてイエロー
、マゼンタおよびシアンが使用され、まず、イエローの
画像形成をし、次にマゼンタの画像を形成する。そして
最後にシアン画像を形成して、カラー画像の形成が完了
される。In an electrophotographic color wet-type developing device that uses two or more color developers, for example, yellow, magenta, and cyan are used as the three color developers, and a yellow image is first formed, and then a magenta image is formed. Form. Finally, a cyan image is formed to complete the formation of a color image.
［発明が解決しようとする課題］
しかしながら、このようなカラー画像形成においては、
マゼンタ現像液にイエロー現像液が混入したり、シアン
現像液にマゼンタ現像液が混入したりといった、他色現
像液の混入は避は難い状態であり、このようにある特定
色の現像液に他色の現像液が混入した場合、現像液中の
トナー濃度検出値が実際の現像液中のトナー濃度より高
い値を示すので、現像液の補給が十分行われず、第３図
に示すようにコピー枚数が増して他色現像液の混入量が
増加するにつれて実際の現像液のトナー濃度が低くなる
。その結果として出力画像の濃度も低くなり、安定した
画像が得にくいという問題点があった。[Problems to be solved by the invention] However, in such color image formation,
It is difficult to avoid the contamination of other color developers, such as yellow developer mixed with magenta developer or magenta developer mixed with cyan developer. If a color developer is mixed in, the detected toner concentration in the developer will be higher than the actual toner concentration in the developer, and the developer will not be replenished sufficiently, resulting in copying problems as shown in Figure 3. As the number of sheets increases and the amount of other color developer mixed in increases, the actual toner concentration of the developer decreases. As a result, the density of the output image becomes low, posing the problem that it is difficult to obtain a stable image.
本発明は、上述した問題点を解決するためになされたも
のであり、２色以上の現像液を用いた電子写真カラー湿
式現像装置において現像液中のトナー濃度を一定値に保
つ現像液補給装置を提供することを目的としている。The present invention has been made in order to solve the above-mentioned problems, and is a developer replenishing device that maintains the toner concentration in the developer at a constant value in an electrophotographic color wet type developing device using two or more color developers. is intended to provide.
［課題を解決するための手段］
上記課題を解決するため、本発明の現像液補給装置は、
発受光素子を用いた現像液のトナー濃度を検出する検出
器と、濃縮現像液を補給する手段とを有し、前記検出器
から検出された現像液のトナー濃度信号と所定の基準濃
度信号値との比較により前記濃縮現像液の補給を制御す
る現像液補給装置において、前記基準濃度信号値をコピ
ー枚数カウンタの出力信号に応じて可変する手段を具備
してなることを特徴とするものである。[Means for Solving the Problems] In order to solve the above problems, the developer replenishment device of the present invention has the following features:
It has a detector for detecting the toner concentration of the developer using a light emitting/receiving element, and a means for replenishing the concentrated developer, and the toner concentration signal of the developer detected by the detector and a predetermined reference concentration signal value are provided. The developer replenishing device for controlling the replenishment of the concentrated developer by comparison with the developer replenishment device is characterized by comprising means for varying the reference density signal value in accordance with an output signal of a copy number counter. .
［作用］
本発明の現像液補給装置は、基準濃度信号値をコピー枚
数カウンター出力信号に応じて可変する手段を具備して
なるので、他色現像液の混入によって起こる現像液濃度
の検出値を実際の現像液濃度に補正して、現像液の補給
を行うことが可能となる。[Function] The developer replenishing device of the present invention includes a means for varying the reference concentration signal value according to the copy number counter output signal, so that the detected value of the developer concentration caused by the mixing of other color developer can be adjusted. It becomes possible to correct the actual developer concentration and replenish the developer.
［実施例］
以下、本発明を具体化した一実施例を図面を参照して説
明する。[Example] Hereinafter, an example embodying the present invention will be described with reference to the drawings.
はじめに、第１図を参照して本実施例の現像液補給装置
の特徴部分を説明する。現像タンク１中には現像液１１
の濃度を検出するための光学式濃度検出器５が備えられ
ており、前記光学式濃度検出器５は、補給現像液制御回
路２３に接続されている。前記補給現像液制御回路２３
には、基準濃度信号発生器２２が接続されており、さら
に前記基準濃度信号発生装置２２にはコピー枚数カウン
タ２１が接続されている。また、濃縮現像液１２を入れ
た補給タンク２は補給管３で現像タンク１と接続されて
いる。補給管には補給現像液制御バルブ４が備えられて
いる。First, the characteristic parts of the developer replenishing device of this embodiment will be explained with reference to FIG. A developing solution 11 is contained in the developing tank 1.
An optical density detector 5 is provided for detecting the density of the developer, and the optical density detector 5 is connected to a replenishment developer control circuit 23. The replenishment developer control circuit 23
A reference density signal generator 22 is connected to the reference density signal generator 22, and a copy number counter 21 is further connected to the reference density signal generator 22. Further, a replenishment tank 2 containing a concentrated developer 12 is connected to the developer tank 1 through a replenishment pipe 3. The replenishment pipe is equipped with a replenishment developer control valve 4.
次に第２図を参照して、電子写真カラー湿式現像装置の
画像形成工程の説明をする。ロール状の光導電感光紙３
０は、図示しない搬送手段により搬送され、所定の長さ
に切断されてドラム３１に巻装される。前記ドラム３１
は図中左方向に回転し、前記光導電性感光紙３０は帯電
装置３２、露光装置３３により表面に静電潜像が形成さ
れる。Next, referring to FIG. 2, the image forming process of the electrophotographic color wet developing device will be explained. Roll-shaped photoconductive paper 3
0 is transported by a transport means (not shown), cut into a predetermined length, and wound around the drum 31. The drum 31
rotates to the left in the figure, and an electrostatic latent image is formed on the surface of the photoconductive photosensitive paper 30 by a charging device 32 and an exposure device 33.
一方、イエロー、マゼンタ、シアンの各色の現像タンク
ｌｙ、１ｍ、ｌｃは現像タンク固定部材４０と共に図示
しない駆動手段により、前記イエロー現像タンク１ｙが
ドラム３０の真下に位置するところまでレール４１上を
移動する。そして、表面に静電潜像を形成した前記光導
電性感光紙３０が現像タンクまで搬送されると、現像液
が前記光導電性感光紙３０に供給され、静電潜像が可視
像化される。同様にしてマゼンタ、シアンの現像工程が
行われ、前記光導電性感光紙３０にカラー画像が形成さ
れた後、排紙トレイに搬送されカラーコピーの工程を終
了する。On the other hand, the yellow, magenta, and cyan color developer tanks ly, 1m, lc are moved together with the developer tank fixing member 40 on the rail 41 by a driving means (not shown) until the yellow developer tank 1y is located directly below the drum 30. do. When the photoconductive photosensitive paper 30 with the electrostatic latent image formed on its surface is transported to a developing tank, a developer is supplied to the photoconductive photosensitive paper 30, and the electrostatic latent image becomes visible. be done. Similarly, magenta and cyan development steps are performed, and after a color image is formed on the photoconductive photosensitive paper 30, it is conveyed to a paper discharge tray to complete the color copying process.
ここで、本発明の現像液補給装置の動作を第１図に示し
た本実施例の特徴部分を参照して説明する。現像タンク
１中の現像液１１のトナー濃度は光学式濃度検出器５に
よって検出される。前記光学式濃度検出器５によって検
出された検出濃度信号１０１は補給現像液制御回路２３
に入力される。一方、基準濃度信号発生器２２はコピー
枚数カウンタ２１からの信号１０３をもとにして、基準
濃度値を算出し、基準濃度信号１０２として、前記補給
現像液制御回路２３に入力される。前記補給現像液制御
回路２３に入力された前記検出濃度信号１０１は基準濃
度信号１０２と比較されて、検出濃度信号が基準濃度信
号よりも小さければ現像液補給を行い、逆に検出濃度信
号が基準濃度信号よりも大きければ現イ象液補給を行わ
ない、という制御信号１０４として圧力される。前記制
御信号１０４によって補給現像液制御バルブ４が駆動さ
れ、補給タンク２中の濃縮現像液１２が現像液１１に補
給され、現像タンク１中の現像液１１のトナー濃度は常
に一定に保つことができる。Here, the operation of the developer replenishing device of the present invention will be explained with reference to the characteristic parts of this embodiment shown in FIG. The toner concentration of the developer 11 in the developer tank 1 is detected by an optical density detector 5 . The detected concentration signal 101 detected by the optical density detector 5 is sent to the replenishment developer control circuit 23.
is input. On the other hand, the reference density signal generator 22 calculates a reference density value based on the signal 103 from the copy number counter 21, and inputs it as the reference density signal 102 to the replenishment developer control circuit 23. The detected concentration signal 101 inputted to the replenishment developer control circuit 23 is compared with the reference concentration signal 102, and if the detected concentration signal is smaller than the reference concentration signal, the developer is replenished; If the concentration signal is greater than the concentration signal, pressure is generated as a control signal 104 that indicates that the problem liquid is not replenished. The replenishment developer control valve 4 is driven by the control signal 104, and the concentrated developer 12 in the replenishment tank 2 is replenished to the developer 11, so that the toner concentration of the developer 11 in the developer tank 1 can always be kept constant. can.
なお、本発明は以上詳述した実施例に限定されるもので
はな（、その趣旨を逸脱しない範囲において種々の変更
を加えることができる。It should be noted that the present invention is not limited to the embodiments detailed above (although various changes can be made without departing from the spirit thereof).
［発明の効果］
以上、詳述したことから明らかなように、本発明によれ
ば、現像液補給を開始する基準値をコピーを行った枚数
に応じて変化させることによって、他色現像液の混入に
よって起こる現像液濃度の検出値と実際の現像液濃度と
の違いを補正して現像液の補給を行うため、現像液中の
トナー濃度を一定に保ち、安定した濃度の画像を提供す
ることができる。[Effects of the Invention] As is clear from the above detailed description, according to the present invention, by changing the reference value for starting developer replenishment according to the number of copies made, To replenish the developer by correcting the difference between the detected developer concentration and the actual developer concentration caused by contamination, the toner concentration in the developer can be kept constant and images with stable density can be provided. I can do it.
第１図は本発明の一実施例である現像液補給装置の一実
施例を示す模式的説明図、第２図は電子写真カラー湿式
現像装置の一例を示す全体構成図、第３図は従来の現像
液補給装置におけるコピー枚数と現像液トナー濃度との
関係を示す図である。
４・・・補給現像液制御バルブ
５・・・光学式濃度積８器
１・・・現像液
２・・・濃縮現像液
１・・・コピー枚数カウンタ
３・・・補給現像液制御回路
１・・・検出濃度信号
２・・・基準濃度信号FIG. 1 is a schematic explanatory diagram showing an example of a developer replenishing device which is an embodiment of the present invention, FIG. 2 is an overall configuration diagram showing an example of an electrophotographic color wet developing device, and FIG. 3 is a conventional diagram. FIG. 3 is a diagram showing the relationship between the number of copies and the developer toner concentration in the developer replenishing device of FIG. 4...Replenishment developer control valve 5...Optical concentration product 8 device 1...Developer 2...Concentrated developer 1...Copy number counter 3...Replenishment developer control circuit 1. ...Detected concentration signal 2...Reference concentration signal
Claims (1)
器と、濃縮現像液を補給する手段とを有し、前記検出器
から検出された現像液のトナー濃度信号と所定の基準濃
度信号値との比較により前記濃縮現像液の補給を制御す
る現像液補給装置において、前記基準濃度信号値をコピ
ー枚数カウンタの出力信号に応じて可変する手段を具備
してなることを特徴とする現像液補給装置。It has a detector for detecting the toner concentration of the developer using a light emitting/receiving element, and a means for replenishing the concentrated developer, and the toner concentration signal of the developer detected by the detector and a predetermined reference concentration signal value are provided. A developer replenishment device for controlling the replenishment of the concentrated developer by comparison with the developer replenishment device, characterized in that the developer replenishment device comprises means for varying the reference concentration signal value according to an output signal of a copy number counter. Device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2224616A JPH04106573A (en) | 1990-08-27 | 1990-08-27 | Developer replenishing device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2224616A JPH04106573A (en) | 1990-08-27 | 1990-08-27 | Developer replenishing device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH04106573A true JPH04106573A (en) | 1992-04-08 |
Family
ID=16816508
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2224616A Pending JPH04106573A (en) | 1990-08-27 | 1990-08-27 | Developer replenishing device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH04106573A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6161911A (en) * | 1996-12-13 | 2000-12-19 | Nec Corporation | Ink jet recording device |
-
1990
- 1990-08-27 JP JP2224616A patent/JPH04106573A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6161911A (en) * | 1996-12-13 | 2000-12-19 | Nec Corporation | Ink jet recording device |
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