JPH09190039A - Toner concentration control method and device thereof - Google Patents

Toner concentration control method and device thereof

Info

Publication number
JPH09190039A
JPH09190039A JP8298974A JP29897496A JPH09190039A JP H09190039 A JPH09190039 A JP H09190039A JP 8298974 A JP8298974 A JP 8298974A JP 29897496 A JP29897496 A JP 29897496A JP H09190039 A JPH09190039 A JP H09190039A
Authority
JP
Japan
Prior art keywords
toner
developing device
developing unit
detected
toner concentration
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
Application number
JP8298974A
Other languages
Japanese (ja)
Other versions
JP2966797B2 (en
Inventor
Takashi Bisaiji
隆 美才治
Noboru Sawayama
昇 沢山
Hideo Yu
英雄 兪
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.)
Ricoh Co Ltd
Original Assignee
Ricoh Co Ltd
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 Ricoh Co Ltd filed Critical Ricoh Co Ltd
Priority to JP8298974A priority Critical patent/JP2966797B2/en
Publication of JPH09190039A publication Critical patent/JPH09190039A/en
Application granted granted Critical
Publication of JP2966797B2 publication Critical patent/JP2966797B2/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Abstract

PROBLEM TO BE SOLVED: To prevent surface staining and the scattering of toner by detecting the concentration of the toner from the quantity of the toner stuck to a photoreceptor in a developing unit for a black developer, and from the ratio of the toner to carriers in a developing unit in a developing unit for a color developer. SOLUTION: The concn. of the toner in a first developing unit A which is disposed around the photoreceptor 1 and has a low use frequency and a small capacity is detected by using an inductance detecting means 3 and the concn. of the toner in a second developing unit B which has a high use frequency and a large capacity is detected by using the same optical detecting means 2 as that in the conventional manner. The inductance detecting means 3 detects the toner concn. by a change in the toner concn., that is, the change in the inductance of a detecting coil caused by the change in permeability due to the change in the ratio of the carriers to the toner, when the developer flows through the detecting coil. In other words, the concn. of the toner in the developing unit B housing the black developer is detected by the detection of the quantity of the toner stuck to the photoreceptor and the concn. of the toner in the developing unit A housing the color developer is detected by the detection of the ratio of the toner to the carriers in the developing unit.

Description

【発明の詳細な説明】Detailed Description of the Invention

【0001】[0001]

【発明の属する技術分野】本発明は電子写真装置のトナ
ー濃度制御方法に関する。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a toner density control method for an electrophotographic apparatus.

【0002】[0002]

【従来の技術】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。
2. Description of the Related Art In recent years, a plurality of developing devices are arranged around a photoconductor, and one of the above-mentioned developing devices is selected by a user's designation so that a latent image on the photoconductor can be printed in an arbitrary color. An electrophotographic apparatus that develops (visualizes) with toner has been proposed.

【0003】すなわち、例えば図4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とがそれぞ
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ている。
That is, in the electrophotographic apparatus shown in FIG. 4, for example, a first developing device A containing red toner and a second developing device B containing black toner are arranged around the photosensitive member 1. When the user operates a mode selection switch (not shown) on the operation panel, the developing device selected from the developing devices A and B is selected according to the designated mode. Of the specified color according to well-known copying processes such as charging, exposure, development and transfer.

【0004】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, when the first developing device A and the second developing device B are developing devices using a two-component developer composed of toner and carrier, the toner and the carrier are used in order to make the density of the copied image uniform. It is necessary to control the toner concentration in order to maintain a constant mixing ratio, that is, the toner concentration.

【0005】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、たとえば図4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 Vsg(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例えば10枚目までは1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 conventional toner density control method in the electrophotographic apparatus described above, for example, in FIG. 4, forms a density pattern (inspection image) of the specified toner on the non-image portion of the photoconductor 1 at a predetermined cycle. The density difference of the density pattern is detected by the well-known optical detecting means 2 as a reflected light amount difference, and this reflected light amount is photoelectrically converted by the P sensor, so that, for example, the front and back of the density pattern are erased and the surface of the photoreceptor 1 is The toner concentration is detected and controlled by comparing the obtained P sensor output Vsg (substantially constant) and the obtained P sensor output Vsp (changed according to the toner concentration). In the conventional toner concentration control, when the toner concentration is detected at a predetermined cycle (for example, the first sheet after the main switch is turned on and every 10 sheets thereafter), when the toner concentration is detected to be low, The toner replenishment solenoid is turned on and off for each sheet until the next toner concentration detection timing, for example, the tenth sheet, so that the toner is continuously replenished to a predetermined developing device.

【0006】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、図5に示すように、その検知レ
ベルは変わるものの、トナーの色に拘らずに制御可能と
なることが知られている。したがって、従来の電子写真
装置では、同一の光学検知手段(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う方法がとられて
いた。
In this toner concentration control method, it is known that if the detection light of the P sensor is selected to be infrared, it can be controlled regardless of the toner color, although the detection level changes as shown in FIG. Has been. Therefore, in the conventional electrophotographic apparatus, the method of controlling the toner density by using the same optical detecting means (including one detecting means in common) has been adopted.

【0007】[0007]

【発明が解決しようとする課題】しかしながら、上記従
来電子写真装置は、たとえば図4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
剤容量に差があるとともに、容量の少ない赤トナーの経
時劣化が、容量の多い黒トナーに比して促進され易いた
め、これらのトナーを同一の光学検知手段によるトナー
濃度制御により制御した場合、赤トナーの方が、その経
時劣化により、トナー濃度が適正にも拘らず、Pセンサ
によりトナー濃度が薄いと検知されて、図6に示すよう
に赤トナーが過剰供給となり、コピーの地汚れや、トナ
ー飛散による機械的トラブルが発生する問題があった。
However, the conventional electrophotographic apparatus described above, for example, as shown in FIG. 4, contains the second developing device B containing the frequently used black toner and the less frequently used red toner. In addition to the difference in developer capacity between the first developing device A and the first developing device A, deterioration of the red toner having a small capacity over time is more easily promoted than that of the black toner having a large capacity. When the toner density is controlled by the detecting means, the red toner is deteriorated with time and the P sensor detects that the toner density is low, though the toner density is proper, and the red toner is red as shown in FIG. There is a problem that excessive supply of toner causes scumming of copy and mechanical problems due to toner scattering.

【0008】本発明の目的は、トナーの色や容量の差に
よって生じるトナーの過剰供給を回避することのできる
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。
An object of the present invention is to provide a toner density control method for an electrophotographic apparatus which can avoid excessive supply of toner caused by a difference in toner color or capacity.

【0009】[0009]

【課題を解決するための手段】請求項1記載の発明は、
同一感光体の周囲に複数の現像器を有し、指定されたモ
ードに従って上記感光体に対し、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
像化を行う電子写真装置において、上記各現像器に収容
されたトナーの色および容量に応じて、異なったトナー
濃度制御手段により、上記各現像器のトナー濃度制御を
行うことを特徴とする。
According to the first aspect of the present invention,
A plurality of developing devices are provided around the same photoconductor, and each developing device is selected and moved closer to the photoconductor according to a designated mode to visualize a latent image on the photoconductor. In the electrophotographic apparatus for performing the above, the toner density control of each developing device is performed by different toner density control means depending on the color and capacity of the toner accommodated in each developing device.

【0010】[0010]

【実施例】本発明は、感光体の周囲の複数の現像器に収
容されたトナーの色および容量に応じて、異なったトナ
ー濃度制御手段により、上記各現像器のトナー濃度制御
を行うことを特徴とする。以下、本発明の実施例を図に
基づいて詳細に説明する。図1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。
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In the present invention, the toner density control of each developing device is performed by different toner density control means according to the color and capacity of the toner accommodated in a plurality of developing devices around the photoconductor. Characterize. Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 shows an example of a toner density control device controlled based on the toner density control method according to the present invention.

【0011】このトナー濃度制御装置は、感光体1の周
囲に配設された、各現像器A、Bのうち、使用頻度およ
び容量の少ない第1現像器Aのトナー濃度をインダクタ
ンス検知手段3を使用して検知し、使用頻度および容量
の多い第2現像器Bのトナー濃度を従来と同様の光学検
知手段2を使用して検知するよう構成されている。
This toner concentration control device uses an inductance detecting means 3 to detect the toner concentration of the first developing device A, which is disposed around the photoconductor 1 and has a small use frequency and a small capacity. The toner density of the second developing device B, which is used and detected, is detected using the same optical detection unit 2 as the conventional one.

【0012】インダクタンス検知手段3は、たとえば図
2に示すように、検知コイル3a、基準コイル3b、検
知発振器3c、基準発振器3d、ゲート3e、積分増幅
器3f、マルチバイブレータ3g、検波器3h、直流増
幅器3iおよび比較器3jなどで構成されている。この
インダクタンス検知手段3は、検知コイル3a内に現像
剤を通過させた際、トナー濃度の変化すなわちキャリア
とトナーとの比の変化により、透磁率が変化し、検知コ
イル3aのインダクタンスが変化することを利用して、
トナー濃度検知を行う。
For example, as shown in FIG. 2, the inductance detecting means 3 includes a detecting coil 3a, a reference coil 3b, a detecting oscillator 3c, a reference oscillator 3d, a gate 3e, an integrating amplifier 3f, a multivibrator 3g, a detector 3h and a DC amplifier. 3i and a comparator 3j. When the developer is passed through the detection coil 3a, the inductance detection means 3 changes the magnetic permeability due to the change in toner concentration, that is, the change in the ratio of carrier to toner, and the inductance of the detection coil 3a changes. By using
Toner concentration is detected.

【0013】すなわち、図2において、検知コイル3a
のインダクタンスの変化により検知発振器3cの発振周
波数が変化する。一方基準コイル3bは、そのインダク
タンスが適正なトナー濃度時の値と一致するように予め
設定される。そして、この基準コイル3bに基づく基準
発振器3dの発振周波数と、検知発振器3cの発振周波
数とを加算し、これを積分増幅器3f、検波器3h、直
流増幅器3iで積分増幅、検波、直流増幅する。ここで
第1現像器Aのトナー濃度が高い場合には、検知コイル
3aのインダクタンスLが小となり、、検知発振器3c
の発振周波数が高くなる。これにより比較器3jの出力
が“L”レベルとなって、比較器3jからトナー補給信
号“L”が出力される。一方、トナー濃度が低い場合に
は、検知コイル3aのインダクタンスLが大となり、検
知発振器3cの発振周波数が小さくなる。これにより、
比較器3jの出力が“H”レベルとなって、比較器3j
からトナー補給信号“H”が出力される。
That is, in FIG. 2, the detection coil 3a
The oscillation frequency of the detection oscillator 3c changes due to the change in the inductance of the. On the other hand, the reference coil 3b is preset so that its inductance matches the value when the toner concentration is appropriate. Then, the oscillation frequency of the reference oscillator 3d based on the reference coil 3b and the oscillation frequency of the detection oscillator 3c are added, and the integrated amplifier 3f, the detector 3h, and the DC amplifier 3i perform integral amplification, detection, and DC amplification. Here, when the toner concentration of the first developing device A is high, the inductance L of the detection coil 3a becomes small, and the detection oscillator 3c
The oscillation frequency of becomes high. As a result, the output of the comparator 3j becomes "L" level, and the toner replenishment signal "L" is output from the comparator 3j. On the other hand, when the toner concentration is low, the inductance L of the detection coil 3a becomes large and the oscillation frequency of the detection oscillator 3c becomes small. This allows
The output of the comparator 3j becomes "H" level, and the comparator 3j
Outputs a toner replenishment signal "H".

【0014】このトナー補給信号、すなわちインダクタ
ンス検知手段3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、および光学検知
手段2の出力がそれぞれ与えられる。
The toner replenishment signal, that is, the output of the inductance detecting means 3 is given to the toner density control means 4. Further, in the toner density control means 4, the output of the color designation input means 5 for outputting a mode selection signal by operating a mode selection switch for designating the color of the toner to be used (designated by the user), and optical detection. The outputs of the means 2 are each provided.

【0015】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。トナー濃度制御手段4は、光学検知手段2、イン
ダクタンス検知手段3、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。
On the other hand, at the output terminal of the toner density control means 4, a first toner replenishing driving means 7 for driving the first toner replenishing roller 6 of the first developing device A, and a second developing device B.
The second toner replenishing driving means 9 for driving the second toner replenishing roller 8 is connected to each of them. Here, each toner replenishment driving means 7 and 9 is configured by a mechanism that rotates each toner replenishment roller 6 and 8 for a predetermined time by turning on / off a known toner replenishment solenoid. The toner concentration control means 4 controls the first and second toner replenishing drive means 7 and 9 in accordance with the outputs of the optical detection means 2, the inductance detection means 3 and the color designation input means 5.

【0016】すなわち、たとえば図3に示すように、ト
ナー濃度制御手段4は、電子写真装置のコピースイッチ
がオンすることにより、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。次いで、上記判断で第1現像器Aが選択さ
れた場合には、インダクタンス検知モードがオンとなっ
て、所定のプログラムに従ってインダクタンス検知手段
3の出力、すなわちトナー補給信号が“L”であるか、
“H”であるかの判定がなされる。これにより、トナー
補給信号が“H”の場合には第1トナー補給駆動手段7
がオンとなって、赤トナーが第1現像器A内に補給され
る。次いで所定のトナー補給(予めプログラムされた回
数のトナー補給)が完了すると、第1トナー補給駆動手
段7がオフとなり、コピーの完了か否かが判定されたの
ち、その動作がストップする。
That is, for example, as shown in FIG. 3, the toner concentration control means 4 first of all develops either the first developing device A or the second developing device B by turning on the copy switch of the electrophotographic apparatus. Is used to determine whether or not image formation is performed. This judgment is determined by the input from the color designation input means 5. Here, when the user specifies the red toner, the first developing device A is moved to the vicinity of the photoconductor 1 and the second developing device B is moved to the vicinity of the photoconductor 1 to be in the developable state when the black toner is specified. Next, when the first developing device A is selected in the above determination, the inductance detection mode is turned on, and the output of the inductance detection means 3, that is, the toner replenishment signal is "L" according to a predetermined program,
It is determined whether it is "H". As a result, when the toner replenishment signal is "H", the first toner replenishment drive means 7
Is turned on, and red toner is replenished in the first developing device A. Then, when the predetermined toner replenishment (toner replenishment of a preprogrammed number of times) is completed, the first toner replenishment driving means 7 is turned off, and it is determined whether or not copying is completed, and then the operation is stopped.

【0017】一方、上記判断で第2現像器Bが選択され
た場合には、光学検知モードがオンとなって、所定のプ
ログラムに従って、光学検知手段2の出力の“H”、
“L”に基づいて、第2トナー補給駆動手段9がオンと
なって、黒トナーが第2現像器B内に補給される。以
下、赤トナーの場合の同様、独自のプログラムに従って
所定のトナー補給が完了すると、第2トナー補給駆動手
段9がオフとなり、コピーの完了により動作がストップ
する。
On the other hand, when the second developing device B is selected in the above judgment, the optical detection mode is turned on and the output of the optical detection means 2 becomes "H", according to a predetermined program.
Based on "L", the second toner replenishment driving means 9 is turned on, and the black toner is replenished into the second developing device B. Thereafter, as in the case of the red toner, when the predetermined toner replenishment is completed according to the original program, the second toner replenishment driving means 9 is turned off, and the operation is stopped when the copying is completed.

【0018】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のトナー濃度制御と、第2現
像器Bのトナー濃度制御とを、それぞれ異なったトナー
濃度制御手段によって、独自のプログラムに従ってトナ
ーの補給を制御することができる。したがって、この発
明のトナー濃度制御方法によれば、トナーの色や容量の
差によって生じるトナーの過剰供給が回避される。
As described above, the toner concentration control device embodying the present invention controls the toner concentration of the first developing device A and the toner concentration control of the second developing device B by different toner concentration control means. Toner replenishment can be controlled according to a unique program. Therefore, according to the toner density control method of the present invention, it is possible to avoid the excessive supply of toner caused by the difference in toner color or capacity.

【0019】[0019]

【発明の効果】本発明によれば、トナーの過剰補給の回
避により、コピーの地汚れや、トナー飛散による機械的
トラブルの発生が防止される。
According to the present invention, by avoiding excessive replenishment of toner, it is possible to prevent the occurrence of background stains on copies and mechanical troubles due to toner scattering.

【図面の簡単な説明】[Brief description of the drawings]

【図1】本発明の一実施例の概略図である。FIG. 1 is a schematic diagram of one embodiment of the present invention.

【図2】図1に示した実施例におけるインダクタンス検
知手段のブロック図である。
FIG. 2 is a block diagram of an inductance detecting means in the embodiment shown in FIG.

【図3】図1に示した実施例の動作の一例を示すフロー
チャートである。
FIG. 3 is a flowchart showing an example of operation of the embodiment shown in FIG.

【図4】従来の電子写真装置の概略図である。FIG. 4 is a schematic view of a conventional electrophotographic apparatus.

【図5】感光体上のトナー付着量と反射光量との関係を
示す線図である。
FIG. 5 is a diagram showing a relationship between a toner adhesion amount on a photoconductor and a reflected light amount.

【図6】コピー枚数とトナー濃度との関係を示す線図で
ある。
FIG. 6 is a diagram showing a relationship between the number of copies and toner density.

【符号の説明】[Explanation of symbols]

A 第1現像器 B 第2現像器 1 感光体 2 光学検知手段 3 インダクタンス検知手段 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 A first developing device B second developing device 1 photoconductor 2 optical detection means 3 inductance detection means 4 toner concentration control means 5 color designation input means 6 first toner supply roller 7 first toner supply drive means 8 second toner supply roller 9 Second toner supply driving means

─────────────────────────────────────────────────────
─────────────────────────────────────────────────── ───

【手続補正書】[Procedure amendment]

【提出日】平成8年11月25日[Submission date] November 25, 1996

【手続補正1】[Procedure amendment 1]

【補正対象書類名】明細書[Document name to be amended] Statement

【補正対象項目名】発明の名称[Correction target item name] Name of invention

【補正方法】変更[Correction method] Change

【補正内容】[Correction contents]

【発明の名称】 トナー濃度制御方法及びその装置 Title: Toner density control method and apparatus

【手続補正2】[Procedure amendment 2]

【補正対象書類名】明細書[Document name to be amended] Statement

【補正対象項目名】特許請求の範囲[Correction target item name] Claims

【補正方法】変更[Correction method] Change

【補正内容】[Correction contents]

【特許請求の範囲】[Claims]

請求項1】トナーとキャリアとからなるカラー現像剤
を収容する現像器と、トナーとキャリアとからなる黒色
現像剤を収容する現像器とで、感光体上の潜像にトナー
を付着させて顕像化を行うためのトナー濃度制御装置に
おいて、黒色現像剤を収容する現像器のトナー濃度検知
は上記感光体に付着したトナー量を検知することによっ
て行い、カラー現像剤を収容する現像器のトナー濃度検
知は現像器内のトナーとキャリアとの比から検知するこ
とを特徴とするトナー濃度制御装置。
1. A developing device containing a color developer composed of a toner and a carrier, and a developing device containing a black developer composed of a toner and a carrier are used to attach toner to a latent image on a photoreceptor. In the toner concentration control device for visualizing, the toner concentration of the developing device containing the black developer is detected by detecting the amount of toner attached to the photoconductor, and the toner concentration of the developing device containing the color developer is detected. A toner concentration control device characterized in that the toner concentration is detected from the ratio of the toner and the carrier in the developing device.

請求項2】トナーとキャリアとからなるカラー現像剤
を収容する現像器と、トナーとキャリアとからなる黒色
現像剤を収容する現像器とで、感光体上の潜像にトナー
を付着させて顕像化を行うためのトナー濃度制御装置に
おいて、黒色現像剤を収容する現像器のトナー濃度検知
は上記感光体に付着したトナー量を検知することによっ
て行い、カラー現像剤を収容する現像器のトナー濃度検
知は現像器内のトナーとキャリアとの比から検知するこ
とを特徴とするトナー濃度制御方法。
2. A developing device containing a color developer containing a toner and a carrier and a developing device containing a black developer containing a toner and a carrier are used to attach toner to a latent image on a photoreceptor. In the toner concentration control device for visualizing, the toner concentration of the developing device containing the black developer is detected by detecting the amount of toner attached to the photoconductor, and the toner concentration of the developing device containing the color developer is detected. A toner concentration control method is characterized in that the toner concentration is detected from the ratio of the toner and the carrier in the developing device.

【手続補正3】[Procedure 3]

【補正対象書類名】明細書[Document name to be amended] Statement

【補正対象項目名】0001[Correction target item name] 0001

【補正方法】変更[Correction method] Change

【補正内容】[Correction contents]

【0001】[0001]

【発明の属する技術分野】本発明はトナー濃度制御方法
及びその装置に関する。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a toner density control method.
And its device .

【手続補正4】[Procedure amendment 4]

【補正対象書類名】明細書[Document name to be amended] Statement

【補正対象項目名】0009[Correction target item name] 0009

【補正方法】変更[Correction method] Change

【補正内容】[Correction contents]

0009[ 0009 ]

【課題を解決するための手段】本発明は、トナーとキャ
リアとからなるカラー現像剤を収容する現像器と、トナ
ーとキャリアとからなる黒色現像剤を収容する現像器と
で、感光体上の潜像にトナーを付着させて顕像化を行う
ためのトナー濃度制御装置において、黒色現像剤を収容
する現像器のトナー濃度検知は上記感光体に付着したト
ナー量を検知することによって行い、カラー現像剤を収
容する現像器のトナー濃度検知は現像器内のトナーとキ
ャリアとの比から検知することを特徴とする。
SUMMARY OF THE INVENTION The present invention comprises a developing device containing a color developer containing a toner and a carrier, and a developing device containing a black developer containing a toner and a carrier. In a toner concentration control device for developing toner by attaching toner to a latent image, the toner concentration of a developing device containing a black developer is detected by detecting the amount of toner attached to the photoreceptor, and The toner density detection of the developing device containing the developer is characterized by detecting from the ratio of the toner and the carrier in the developing device.

【手続補正5】[Procedure Amendment 5]

【補正対象書類名】明細書[Document name to be amended] Statement

【補正対象項目名】0019[Correction target item name] 0019

【補正方法】変更[Correction method] Change

【補正内容】[Correction contents]

0019[ 0019 ]

【発明の効果】本発明によれば、黒色現像剤を収容する
現像器のトナー濃度検知は感光体に付着したトナー量か
ら検知し、カラー現像剤を収容する現像器のトナー濃度
検知は現像器内のトナーとキャリアとの比から検知する
ことで、トナーの経時変化と光吸収性を考慮した正確な
トナー濃度を検知でき、過剰補給による地汚れやトナー
飛散を回避できる。
According to the present invention, the toner concentration of the developing device containing the black developer is detected from the amount of toner adhering to the photoconductor, and the toner concentration of the developing device containing the color developer is detected. By detecting from the ratio of the toner and the carrier in the inside, it is possible to detect the accurate toner concentration in consideration of the change with time of the toner and the light absorption property, and it is possible to avoid the background stain and the toner scattering due to excessive replenishment.

Claims (1)

【特許請求の範囲】[Claims] 【請求項1】同一感光体の周囲に複数の現像器を有し、
指定されたモードに従って上記感光体に対し、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う電子写真装置において、上記各
現像器に収容されたトナーの色および容量に応じて、異
なったトナー濃度制御手段により、上記各現像器のトナ
ー濃度制御を行うことを特徴とする電子写真装置のトナ
ー濃度制御方法。
1. A plurality of developing devices are provided around the same photosensitive member,
In the electrophotographic apparatus that visualizes the latent image on the photoconductor by selecting and moving the development devices in proximity to the photoconductor according to the designated mode, the development device is accommodated in each of the development devices. A toner concentration control method for an electrophotographic apparatus, characterized in that the toner concentration control means controls the toner concentration of each developing device according to the color and the capacity of the toner.
JP8298974A 1996-11-11 1996-11-11 Method and apparatus for controlling toner concentration Expired - Lifetime JP2966797B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP8298974A JP2966797B2 (en) 1996-11-11 1996-11-11 Method and apparatus for controlling toner concentration

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP8298974A JP2966797B2 (en) 1996-11-11 1996-11-11 Method and apparatus for controlling toner concentration

Related Parent Applications (1)

Application Number Title Priority Date Filing Date
JP62064596A Division JP2860965B2 (en) 1987-03-19 1987-03-19 Method and apparatus for controlling toner concentration

Publications (2)

Publication Number Publication Date
JPH09190039A true JPH09190039A (en) 1997-07-22
JP2966797B2 JP2966797B2 (en) 1999-10-25

Family

ID=17866605

Family Applications (1)

Application Number Title Priority Date Filing Date
JP8298974A Expired - Lifetime JP2966797B2 (en) 1996-11-11 1996-11-11 Method and apparatus for controlling toner concentration

Country Status (1)

Country Link
JP (1) JP2966797B2 (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006146211A (en) * 2004-11-18 2006-06-08 Xerox Corp Method and apparatus for measuring toner concentration
JP2008158518A (en) * 2006-12-22 2008-07-10 Xerox Corp Improvement of photoconductor life through active control of charger setting
US7817941B2 (en) * 2007-02-16 2010-10-19 Konica Minolta Business Technologies, Inc. Color image forming apparatus having developing devices with different storage capacities

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5026550A (en) * 1973-07-06 1975-03-19
JPS57136668A (en) * 1981-02-18 1982-08-23 Canon Inc Developer density controller
JPS59124359A (en) * 1982-12-29 1984-07-18 Ricoh Co Ltd Controlling method of toner density in electrophotographic device
JPS61132969A (en) * 1984-11-30 1986-06-20 Ricoh Co Ltd Color recorder
JPS61204647A (en) * 1985-03-07 1986-09-10 Matsushita Electric Ind Co Ltd Electrostatic developing method
JPS61270774A (en) * 1985-05-27 1986-12-01 Toshiba Corp Toner density control device
JPS61272767A (en) * 1985-05-28 1986-12-03 Minolta Camera Co Ltd Image forming device

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5026550A (en) * 1973-07-06 1975-03-19
JPS57136668A (en) * 1981-02-18 1982-08-23 Canon Inc Developer density controller
JPS59124359A (en) * 1982-12-29 1984-07-18 Ricoh Co Ltd Controlling method of toner density in electrophotographic device
JPS61132969A (en) * 1984-11-30 1986-06-20 Ricoh Co Ltd Color recorder
JPS61204647A (en) * 1985-03-07 1986-09-10 Matsushita Electric Ind Co Ltd Electrostatic developing method
JPS61270774A (en) * 1985-05-27 1986-12-01 Toshiba Corp Toner density control device
JPS61272767A (en) * 1985-05-28 1986-12-03 Minolta Camera Co Ltd Image forming device

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006146211A (en) * 2004-11-18 2006-06-08 Xerox Corp Method and apparatus for measuring toner concentration
JP4685598B2 (en) * 2004-11-18 2011-05-18 ゼロックス コーポレイション Toner concentration measuring method and apparatus
JP2008158518A (en) * 2006-12-22 2008-07-10 Xerox Corp Improvement of photoconductor life through active control of charger setting
US7817941B2 (en) * 2007-02-16 2010-10-19 Konica Minolta Business Technologies, Inc. Color image forming apparatus having developing devices with different storage capacities

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