JPS63231380A - Method for controlling toner concentration of electrophotographic device - Google Patents
Method for controlling toner concentration of electrophotographic deviceInfo
- Publication number
- JPS63231380A JPS63231380A JP6459787A JP6459787A JPS63231380A JP S63231380 A JPS63231380 A JP S63231380A JP 6459787 A JP6459787 A JP 6459787A JP 6459787 A JP6459787 A JP 6459787A JP S63231380 A JPS63231380 A JP S63231380A
- Authority
- JP
- Japan
- Prior art keywords
- toner
- concn
- detection means
- developing device
- density
- 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.)
- Granted
Links
- 238000000034 method Methods 0.000 title claims description 12
- 238000001514 detection method Methods 0.000 claims abstract description 38
- 230000003287 optical effect Effects 0.000 claims abstract description 16
- 108091008695 photoreceptors Proteins 0.000 claims description 8
- 238000010586 diagram Methods 0.000 description 4
- VOZKAJLKRJDJLL-UHFFFAOYSA-N 2,4-diaminotoluene Chemical compound CC1=CC=C(N)C=C1N VOZKAJLKRJDJLL-UHFFFAOYSA-N 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000012800 visualization Methods 0.000 description 1
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
- G03G15/01—Apparatus for electrographic processes using a charge pattern for producing multicoloured copies
- G03G15/0105—Details of unit
- G03G15/0126—Details of unit using a solid developer
-
- 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
- G03G15/06—Apparatus for electrographic processes using a charge pattern for developing
- G03G15/08—Apparatus for electrographic processes using a charge pattern for developing using a solid developer, e.g. powder developer
- G03G15/0822—Arrangements for preparing, mixing, supplying or dispensing developer
- G03G15/0848—Arrangements for testing or measuring developer properties or quality, e.g. charge, size, flowability
- G03G15/0849—Detection or control means for the developer concentration
-
- 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
- G03G15/5041—Detecting a toner image, e.g. density, toner coverage, using a test patch
Abstract
Description
【発明の詳細な説明】 （技術分野） 本発明は電子写真装置のトナー濃度制御方法に関する。[Detailed description of the invention] (Technical field) The present invention relates to a toner density control method for an electrophotographic apparatus.
（従来技術）
近年、感光体の周囲に複数の現像器を配設し、ユーザー
の指定により、上記各現像器のいずれかを選択すること
により、感光体上の潜像を任意の色のトナーで現像（顕
像化）する電子写真装置が提案されている。すなわち、
たとえば第３図に示す電子写真装置では、感光体１の周
囲に、赤トナーが収容された第１現像器Ａと、黒トナー
が収容された第２現像器Ｂとがそゎぞれ配設されており
、ユーザーが操作パネル上のモード選択スイッチ（図示
せず）を操作することにより、指定されたモードに応じ
て、各現像器Ａ、Ｂのうちの選択された現像器が感光体
１の近傍まで移動し、帯電、露光、現像、転写などの周
知の複写プロセスに従って指定された色のコピーを得る
ように構成されるいる。(Prior art) In recent years, a plurality of developing devices are arranged around a photoconductor, and the user can select one of the above-mentioned developing devices to convert the latent image on the photoconductor into toner of any color. An electrophotographic device that performs development (visualization) has been proposed. That is,
For example, in the electrophotographic apparatus shown in FIG. 3, a first developing device A containing red toner and a second developing device B containing black toner are arranged around the photoreceptor 1. When the user operates a mode selection switch (not shown) on the operation panel, the selected developer among the developers A and B is set to the photoreceptor 1 according to the specified mode. and is configured to obtain a copy of a specified color according to well-known copying processes such as charging, exposing, developing, and transferring.
ところで、第１現像器Ａおよび第２現像器Ｂがトナーと
キャリアとからなる２成分現像剤を使用する現像器の場
合、コピーされた画像の濃度を均一にするため、トナー
とキャリアとの混合比、すなわちトナー濃度を一定に保
つためのトナー濃度制御が必要となる。By the way, in the case where the first developing device A and the second developing device B use a two-component developer consisting of toner and carrier, in order to make the density of the copied image uniform, it is necessary to mix the toner and carrier. Toner density control is required to keep the ratio, that is, the toner density, constant.
上記従来の電子写真装置におけるトナー濃度制御方法は
、たとえば第３図において、所定の周期で感光体１の非
画像部に指定されたトナーによる濃度パターン（被検像
）を形成し、この濃度パターンの濃淡差を周知の光学検
知手段２によって反射光量差として検出するとともに、
この反射光量をＰセンサで光電変換することにより、た
とえば濃度パターンの前後をイレースし、その感光体１
の表面を見て得たＰセンサ出力Ｖｓｃ（（略一定）と、
濃度パターンを見て得たＰセンサ出力ｖｓｐ（トナー濃
度に応じて変化）との比較によりトナー濃度を検知し、
制御している。また、従来のトナー濃度制御では、トナ
ー濃度の検知時期が所定の周期（たとえば、メインスイ
ッチオン後の１枚目とその後１０枚毎）で行なわれ、ト
ナー濃度が薄いと検知された場合には、次のトナー濃度
検知時期までのたとえば１０枚目までは〕一枚毎にトナ
ー補給ソレノイドがオン→オフして、所定の現像器にト
ナーを補給し続けるように制御されている。The toner density control method in the conventional electrophotographic apparatus described above, for example, as shown in FIG. A well-known optical detection means 2 detects the difference in density as a difference in amount of reflected light, and
By photoelectrically converting this amount of reflected light with a P sensor, for example, the front and back of a density pattern can be erased, and the photoreceptor 1
P sensor output Vsc ((approximately constant) obtained by looking at the surface of
The toner density is detected by comparing it with the P sensor output vsp (changes according to the toner density) obtained by looking at the density pattern,
It's in control. In addition, in conventional toner density control, the toner density is detected at predetermined intervals (for example, the first sheet after the main switch is turned on and every 10 sheets thereafter), and if the toner density is detected to be low, Until the next toner concentration detection time, for example, up to the 10th sheet, the toner replenishment solenoid is turned on and off for each sheet, and is controlled to continue replenishing toner to a predetermined developing device.
このトナー濃度制御方法は、Ｐセンサーの検出光を赤外
に選べば、第４図に示すように、その検知レベルは変る
ものの、トナーの色に関わらずに制御可能となることが
知られている。It is known that this toner density control method can be controlled regardless of the color of the toner, although the detection level changes if the detection light of the P sensor is selected as infrared light, as shown in Figure 4. There is.
したがって、従来の電子写真装置では、同種の光学検知
手段（一つの検知手段の共用を含む）を用いてトナー濃
度制御を行なう方法がとられていた。Therefore, in conventional electrophotographic apparatuses, a method has been adopted in which toner density control is performed using optical detection means of the same type (including the use of one detection means in common).
しかしながら、上記従来電子写真装置は、たとえば第３
図に示すように、使用頻度の高い黒トナーを収容した第
２現像器Ｂと、使用頻度の低い赤トナーを収容した第１
現像器Ａとで、その現像剤容量に差があることが多い。However, the conventional electrophotographic apparatus described above, for example,
As shown in the figure, the second developing unit B contains the frequently used black toner, and the first developing unit B contains the less frequently used red toner.
There is often a difference in developer capacity between developer A and developer A.
このため、光学検知手段による検知時期を各現像器Ａ、
Ｂともに同一時期とした場合には、これら現像器Ａ、Ｂ
の容量差により、たとえば第５図に示すように、第１現
像器Ａのトナー濃度のバラツキが、第２現像器Ｂのトナ
ー濃度のバラツキに比して著しく大きくなり、コピーの
画像濃度が不安定となる問題があった。For this reason, the detection timing by the optical detection means is determined for each developing unit A,
If both developing devices A and B are set at the same time,
Due to the difference in capacity, for example, as shown in FIG. 5, the variation in the toner density of the first developing device A becomes significantly larger than the variation in the toner density of the second developing device B, and the image density of the copy becomes defective. There was a problem with stability.
（目 的）
本発明の目的は、現像器および現像剤の容量差によって
生じるトナー濃度のバラツキを低減することのできる電
子写真装置のトナー濃度制御方法を提供することにある
。(Objective) An object of the present invention is to provide a toner density control method for an electrophotographic apparatus that can reduce variations in toner density caused by differences in capacity between a developing device and a developer.
（構 成）
本発明は、複数の現像器およびトナーの容量に応じて、
トナー濃度検知手段の検知モードを変えることを特徴と
する。(Configuration) According to the present invention, according to the plurality of developing devices and the capacity of toner,
The present invention is characterized in that the detection mode of the toner concentration detection means is changed.
以下、本発明の実施例を図に基づいて詳細に説明する。Hereinafter, embodiments of the present invention will be described in detail based on the drawings.
第１図は、本発明によるトナー濃度制御方法に基づいて
制御されるトナー濃度制御装置の一例を示す。FIG. 1 shows an example of a toner density control device controlled based on the toner density control method according to the present invention.
第１図において、感光体１の周囲には、赤トナーの収容
された容量の小さな第１現像器Ａと、黒トナーの収容さ
れた容量の大きな第２現像器Ｂとがそれぞれ配設されて
いる。また、感光体１の非画像部には、この非画像部に
形成される濃度パターンＰを検知するための光学検知手
段２が配設されている。この光学検知手段２は、たとえ
ば周知の発光素子（ＬＥＤ）と、受光素子（Ｐセンサ）
とからなる光反射型のフォトセンサなどで構成されてい
る。この光学検知手段２は、検知する濃度パターンＰの
濃度が高い場合には、Ｐセンサの出力が１１ Ｌ ｌｌ
となり、トナー補給信号（ｉ Ｌ Ｈが出力される。In FIG. 1, a first developing device A with a small capacity containing red toner and a second developing device B with a large capacity containing black toner are arranged around the photoreceptor 1. There is. Further, in the non-image area of the photoreceptor 1, an optical detection means 2 is provided for detecting the density pattern P formed in this non-image area. This optical detection means 2 includes, for example, a well-known light emitting element (LED) and a light receiving element (P sensor).
It consists of a light-reflecting photosensor, etc. In this optical detection means 2, when the density of the density pattern P to be detected is high, the output of the P sensor is 11 L ll
Then, a toner replenishment signal (i L H is output).
一方、濃度パターンＰの濃度が低い場合には、Ｐセンサ
の出力が１１ ＨＩ＋となり、トナー補給信号ＬＬ Ｈ
１７が出力される。これらのトナー補給信号、すなわち
光学検知手段２の出力はトナー濃度制御手段４に与えら
れる。さらにこのトナー濃度制御手段４には、使用する
トナーの色を指定（ユーザーにより指定）するためのモ
ード選択スイッチを操作することによりモード選択信号
を出力する色指定入力手段５の出力が与えられる。一方
、トナー濃度制御手段４の出力端子には、第１現像器Ａ
の第１トナー補給ローラ６を駆動するための第１トナー
補給駆動手段７．および第２現像器Ｂの第２トナー補給
ローラ８を駆動するための第２トナー補給駆動手段９が
それぞれ接続されている。ここで、各トナー補給駆動手
段７．９は、たとえば、周知のトナー補給ソレノイドの
オンオフにより、各トナー補給ローラ６．８を所定時間
だけ回転させる機構などにより構成される。On the other hand, when the density of the density pattern P is low, the output of the P sensor becomes 11 HI+, and the toner replenishment signal LL H
17 is output. These toner replenishment signals, ie, the output of the optical detection means 2, are given to the toner concentration control means 4. Furthermore, the toner density control means 4 is supplied with the output of a color designation input means 5 which outputs a mode selection signal by operating a mode selection switch for designating (specified by the user) the color of toner to be used. On the other hand, the output terminal of the toner density control means 4 is connected to the first developing device A.
a first toner replenishment drive means 7 for driving the first toner replenishment roller 6; and a second toner replenishment driving means 9 for driving the second toner replenishment roller 8 of the second developing device B are connected to each other. Here, each toner replenishment drive means 7.9 is constituted by, for example, a mechanism that rotates each toner replenishment roller 6.8 for a predetermined period of time by turning on and off a well-known toner replenishment solenoid.
トナー濃度制御手段４は、光学検知手段２、および色指
定入力手段５の出力に応じて、第１、第２の各トナー補
給駆動手段７．９を制御する。The toner density control means 4 controls each of the first and second toner replenishment drive means 7.9 in accordance with the outputs of the optical detection means 2 and the color designation input means 5.
すなわち、第２図に示すように、トナー濃度制御手段４
は、電子写真装置のメインスイッチ（図示せず）がオン
することにより、スタートし、コピースイッチ（図示せ
ず）がオンされてコピーが開始されると、先ず、第１現
像器Ａと第２現像器Ｂのいずれの現像器により作像が行
なわれるかが判断される。この判断は、色指定入力手段
５からの入力によって決定される。ここで、ユーザーが
赤トナーを指定した場合には、第１現像器Ａが黒トナー
を指定した場合には第２現像器Ｂが感光体１の近傍に移
動されて現像可能状態となる。That is, as shown in FIG.
starts when the main switch (not shown) of the electrophotographic apparatus is turned on, and when the copy switch (not shown) is turned on and copying starts, the first developing unit A and the second developing unit It is determined which of the developing devices B is used to perform image formation. This judgment is determined by input from the color designation input means 5. Here, when the user specifies red toner, and when the first developer A specifies black toner, the second developer B is moved to the vicinity of the photoreceptor 1 and becomes ready for development.
次いで、上記判断で第１現像器Ａが選択された場合には
、光学検知手段２の検知モードが、コピーが５回実行さ
れる毎に赤トナーによる濃度パターンを作成し、この濃
度パターンを光学検知手段２で検知するモードに設定さ
れる。ここで光学検知手段２の出力すなわちＰセンサの
出力がＬＩ ＨＩ＋の場合には、赤トナーが第１現像器
Ａに補給される。Next, when the first developing device A is selected in the above judgment, the detection mode of the optical detection means 2 creates a density pattern using red toner every five times copying is performed, and this density pattern is optically detected. The detection means 2 is set to a detection mode. Here, when the output of the optical detection means 2, that is, the output of the P sensor is LIHI+, red toner is replenished into the first developing device A.
このときの赤トナーの補給量は予めプログラムされた量
に設定されており、この補給が完了した時点で動作がス
トップする。The amount of red toner replenished at this time is set to a preprogrammed amount, and the operation stops when this replenishment is completed.
一方、上記判断で第２現像器Ｂが選択された場合には、
光学検知手段の検知モードが、コピーが１００回実され
る毎に黒トナーによる濃度パターンを作成し、この濃度
パターンを光学検知手段２で検知するモードに設定され
る。ここでＰセンサの出力が“Ｈｒｒの場合には黒トナ
ーが第２現像器Ｂに対して、予めプログラムされた量だ
け補給され、この補給が完了した時点で動作がストップ
する。On the other hand, if the second developing device B is selected in the above judgment,
The detection mode of the optical detection means is set to a mode in which a density pattern is created using black toner every 100 copies and this density pattern is detected by the optical detection means 2. Here, when the output of the P sensor is "Hrr", black toner is replenished to the second developing device B in a preprogrammed amount, and the operation is stopped when this replenishment is completed.
ここで、第１現像器Ａおよび第２現像器Ｂに収容される
トナーの種類、およびその補給時における検知モード（
たとえば濃度パターン検知時期）は上述の実施例に限定
されない。Here, the type of toner contained in the first developing device A and the second developing device B, and the detection mode (
For example, the density pattern detection timing) is not limited to the above embodiment.
このように、本発明を実施したトナー濃度制御装置は、
第１現像器Ａのトナー濃度の検知モードと、第２現像器
Ｂのトナー濃度の検知モードとを変えることによって、
それぞれのトナー補給量および補給タイミングを、トナ
ーの色や容量に応じて最適な値に設定することができる
。In this way, the toner density control device implementing the present invention has the following features:
By changing the toner concentration detection mode of the first developer A and the toner concentration detection mode of the second developer B,
Each toner replenishment amount and replenishment timing can be set to optimal values according to the color and capacity of the toner.
したがって、この発明のトナー濃度制御方法によれば、
各現像器の容量差によるトナー濃度のバラツキを低減さ
せることができる。Therefore, according to the toner density control method of the present invention,
It is possible to reduce variations in toner concentration due to differences in capacity of each developing device.
（効 果）
本発明によれば、トナー濃度のバラツキの低減により、
コピーの画像濃度を安定させることができる。(Effect) According to the present invention, by reducing the variation in toner concentration,
The image density of copies can be stabilized.
第１図は本発明の一実施例の概略図、第２図は上記実施
例の動作の一例を示すフローチャート、第３図は従来の
電子写真装置の概略図、第４図は感光上のトナー付着量
と反射量との関係を示す線図、第５図はコピ一枚数とト
ナー濃度との関係を示す線図である。
Ａ・・・第１現像器、Ｂ・・・第２現像器、１・・・感
光体、２・・・光学検知手段、４・・・トナー濃度制御
手段、５・・・色指定入力手段、６・・・第１トナー補
給ローラ、７・・・第１トナー補給駆動手段、８・・・
第２トナー補給ローラ、９・・・第２トナー補給駆動手
段。
つイ５ イ シ？）
％′３図Fig. 1 is a schematic diagram of an embodiment of the present invention, Fig. 2 is a flowchart showing an example of the operation of the above embodiment, Fig. 3 is a schematic diagram of a conventional electrophotographic apparatus, and Fig. 4 is a toner on photosensitive material. FIG. 5 is a diagram showing the relationship between the amount of adhesion and the amount of reflection, and FIG. 5 is a diagram showing the relationship between the number of copies and toner density. A: first developer, B: second developer, 1: photoreceptor, 2: optical detection means, 4: toner density control means, 5: color specification input means , 6... first toner replenishment roller, 7... first toner replenishment drive means, 8...
Second toner replenishment roller, 9... second toner replenishment drive means. Tsui 5 Ishi? ) %'3 figure
Claims (1)
光体に対し上記各現像器を選択して近接移動させること
により、上記感光体上の潜像の顕像化を行なうとともに
、各現像器のトナー濃度制御を同種のトナー濃度検知手
段に基づいて行なう電子写真装置において、上記各現像
器およびトナーの容量に応じて、上記トナー濃度検知手
段の検知モードを変えることを特徴とする電子写真装置
のトナー濃度制御方法。 ２、上記検知手段が、感光体の非画像部に形成した濃度
パターンのトナー付着量を光学的に検知する光学検知手
段である特許請求の範囲第１項記載のトナー濃度制御方
法。 ３、上記検知モードが、上記光学検知手段により濃度パ
ターンを検知する検知時期を設定するモードである特許
請求の範囲第１項記載のトナー濃度制御方法。[Claims] 1. It has a plurality of developing devices, and the latent image on the photosensitive member is visualized by selecting each of the developing devices and moving them close to the photosensitive member according to a designated mode. In an electrophotographic apparatus in which the toner concentration of each developer is controlled based on the same type of toner concentration detection means, the detection mode of the toner concentration detection means is changed according to the capacity of each developer and toner. A toner density control method for an electrophotographic device, characterized in that: 2. The toner density control method according to claim 1, wherein the detection means is an optical detection means for optically detecting the amount of toner adhering to the density pattern formed on the non-image area of the photoreceptor. 3. The toner density control method according to claim 1, wherein the detection mode is a mode for setting a detection timing for detecting a density pattern by the optical detection means.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62064597A JP2847676B2 (en) | 1987-03-19 | 1987-03-19 | Toner density control device |
| US07/170,264 US4875079A (en) | 1987-03-19 | 1988-03-18 | Toner density control for multicolor electrophotographic copier |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62064597A JP2847676B2 (en) | 1987-03-19 | 1987-03-19 | Toner density control device |
Related Child Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP8298979A Division JPH09179397A (en) | 1996-11-11 | 1996-11-11 | Electrophotographic device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS63231380A true JPS63231380A (en) | 1988-09-27 |
| JP2847676B2 JP2847676B2 (en) | 1999-01-20 |
Family
ID=13262822
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP62064597A Expired - Lifetime JP2847676B2 (en) | 1987-03-19 | 1987-03-19 | Toner density control device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2847676B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0527528A (en) * | 1991-07-18 | 1993-02-05 | Canon Inc | Image forming device |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61245177A (en) * | 1985-04-23 | 1986-10-31 | Minolta Camera Co Ltd | Automatic toner concentration controller |
-
1987
- 1987-03-19 JP JP62064597A patent/JP2847676B2/en not_active Expired - Lifetime
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61245177A (en) * | 1985-04-23 | 1986-10-31 | Minolta Camera Co Ltd | Automatic toner concentration controller |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0527528A (en) * | 1991-07-18 | 1993-02-05 | Canon Inc | Image forming device |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2847676B2 (en) | 1999-01-20 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EXPY | Cancellation because of completion of term |