JPS6358472A - Detector for concentration of developer - Google Patents

Detector for concentration of developer

Info

Publication number
JPS6358472A
JPS6358472A JP20334786A JP20334786A JPS6358472A JP S6358472 A JPS6358472 A JP S6358472A JP 20334786 A JP20334786 A JP 20334786A JP 20334786 A JP20334786 A JP 20334786A JP S6358472 A JPS6358472 A JP S6358472A
Authority
JP
Japan
Prior art keywords
developer
concentration
output
sensor
voltage
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
Application number
JP20334786A
Other languages
Japanese (ja)
Inventor
Katsunori Kikuchi
勝則 菊池
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.)
Toshiba Corp
Original Assignee
Toshiba Corp
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 Toshiba Corp filed Critical Toshiba Corp
Priority to JP20334786A priority Critical patent/JPS6358472A/en
Publication of JPS6358472A publication Critical patent/JPS6358472A/en
Pending legal-status Critical Current

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
    • G03G15/06—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
    • G03G15/06—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
    • G03G15/0855—Detection or control means for the developer concentration the concentration being measured by optical means

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Dry Development In Electrophotography (AREA)

Abstract

PURPOSE:To appropriately control the concentration of a developer by setting a required range to an output that a sensor detects and setting a reference level within said range. CONSTITUTION:If a copying machine, for instance, is installed, firstly, a variable resistance 16 in a decision circuit 11 is operated, and the upper-limit and lower- limit voltages Vh and Vl of the output that the sensor 10 detects are set so that light emitting diodes 18 and 20 can put off. Secondly a variable resistance 24 constituting a developer concentration selection circuit 21 is operated, and reference voltages Vsh and Vsl are adjusted so that light emitting diodes 18a and 20a can put off. Thus the reference voltages Vsh and Vsl can be set to the linear part of the output that the sensor 10 detects, whereby the concentration of the developer can be appropriately controlled without fail.

Description

【発明の詳細な説明】 ［発明の目的］ （産業上の利用分野） この発明は、例えば複写機の現像剤の濃度を検出する装
置に関する。DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Field of Industrial Application) The present invention relates to a device for detecting the concentration of developer in, for example, a copying machine.

（従来の技術） 周知のように、電子複写機においては、現像器に収容さ
れる現像剤の濃度を、例えば磁気センサによって検出し
、この検出出力を用いて現像器に取付けられた、現像剤
収容部から現像器への現像剤の供給、および停止を制御
するようになっている。(Prior Art) As is well known, in an electronic copying machine, the concentration of the developer contained in the developing device is detected by, for example, a magnetic sensor, and the detection output is used to detect the concentration of the developer contained in the developing device. It controls supply and stop of developer from the storage section to the developing device.

第４図は、前記磁気センサの出力特性を示すものである
。この磁気センサは、現像器に収容された現像剤の濃度
に応じて、出力電圧が実線で示す如く変化するようにな
っている。前述した現像剤の供給停止制御は、この出力
信号のリニア部分りに基準レベルを設定し、例えばこの
基準レベルより出力電圧が高くなった場合、現像剤の濃
度が低くなったものと判断して、現像剤を現像剤収容部
から現像器に供給するようになっている。FIG. 4 shows the output characteristics of the magnetic sensor. The output voltage of this magnetic sensor changes as shown by the solid line depending on the concentration of the developer contained in the developing device. In the developer supply stop control described above, a reference level is set on the linear part of this output signal, and for example, when the output voltage becomes higher than this reference level, it is determined that the developer concentration has become low. , the developer is supplied from the developer storage section to the developing device.

ところで、前記磁気センサは、これが現像器の内部に取
付けられた場合、第４図に実線で示すような電圧が出力
されるよう、予め治具を用いて、出力電圧が調整されて
いる。しかしながら、磁気センサからの出力電圧は、現
像器の製造上の誤差や使用環境によって、第４図に点線
で示す如く変化することがある。このような状態におい
て、磁気センサの出力電圧におけるリニアでない部分Ｎ
Ｌ１．：濃度制御の基準レベルが設定された場合、現像
剤の濃度を適正に制御することが困難となるものであっ
た。Incidentally, the output voltage of the magnetic sensor is adjusted in advance using a jig so that when the magnetic sensor is installed inside the developing device, a voltage as shown by the solid line in FIG. 4 is outputted. However, the output voltage from the magnetic sensor may change as shown by the dotted line in FIG. 4 due to errors in manufacturing the developing device or the environment in which it is used. In such a state, the non-linear portion N in the output voltage of the magnetic sensor
L1. : When a reference level for density control is set, it is difficult to properly control the density of the developer.

（発明が解決しようとする問題点） この発明は、現像器の製造上の誤差や使用環境による、
センサの出力電圧の変化に係わる問題を解決するもので
あり、その目的とするところは、センサの検出出力に所
要の範囲を設定し、この範囲内で基準レベルを設定する
ことにより、現像剤の濃度制御を適正に実行させること
が可能な現像剤濃度検出装置を提供しようとするもので
ある。(Problems to be Solved by the Invention) This invention solves problems caused by manufacturing errors and usage environment of the developing device.
This solves problems related to changes in sensor output voltage, and its purpose is to set a required range for the sensor's detection output, and to set a reference level within this range to determine the amount of developer. It is an object of the present invention to provide a developer concentration detection device that can appropriately execute concentration control.

［発明の構成］ （問題点を解決するための手段） この発明は、現像剤の濃度を検出する検出手段と、この
検出手段の検出出力の上限レベルと、下限レベルを設定
する第１の設定手段と、前記上限レベルと、下限レベル
の相互間に現像剤の濁度ＩＩＩ　＠を行う基準レベルを
設定する第２の設定手段ととから構成されている。[Structure of the Invention] (Means for Solving the Problems) The present invention includes a detection means for detecting the concentration of developer, and a first setting for setting an upper limit level and a lower limit level of the detection output of the detection means. and a second setting means for setting a reference level for determining the developer turbidity III between the upper limit level and the lower limit level.

（作用） この発明は、第１の設定手段によって、検出手段の検出
出力の上限レベルと、下限レベルを設定し、第２の設定
手段により、前記上限レベルと、下限レベルの相互間に
現像剤の濃度制御を行う基準レベル内に設定することに
より、常時適正な濃度制御を行なえるようにしたもので
ある。(Function) In the present invention, the first setting means sets the upper limit level and the lower limit level of the detection output of the detection means, and the second setting means sets the developer between the upper limit level and the lower limit level. By setting the concentration within the reference level for performing concentration control, it is possible to always perform appropriate concentration control.

（実施例） 以下、この発明の一実施例について図面を参照して説明
する。(Example) Hereinafter, an example of the present invention will be described with reference to the drawings.

第１図において、例えば磁気センサからなるセンサ１０
は、図示せぬ現像器の内部に装着されており、このセン
サ１０の出力信号は、判別回路（第１の設定回路）１１
を構成する第１、第２の比較器１２．１３の一方入力端
に供給されている。In FIG. 1, a sensor 10 consisting of, for example, a magnetic sensor
is installed inside a developing device (not shown), and the output signal of this sensor 10 is sent to a discrimination circuit (first setting circuit) 11.
The signal is supplied to one input terminal of the first and second comparators 12 and 13 that constitute the circuit.

これら第１、第２の比較器１２．１３の他方入力端には
、第３図に示すセンサ１０の出力電圧の上限電圧Ｖｈ１
および下限電圧Ｖ１が供給されている。即ち、この［源
Ｖと接地間には、抵抗１４．１５、可変抵抗１６が直列
接続されており、抵抗１４と１５の接続点は第１の比較
器１２の他方入力端に接続され、抵抗１５と、可変抵抗
１６の接続点は、第２の比較器１３の他方入力端に接続
されている。そして、可変抵抗１６を操作することによ
り、上限電圧■ｈ１下限電圧■１が調整されるようにな
っている。また、第１の比較器１２の出力端は抵抗１７
、発光ダイオード１８を介して第２の比較器１３の出力
端に接続され、前記抵抗１４と１５の接続点は、抵抗１
９、発光ダイオード２０を介して第２の比較器１３の出
力端に接続されている。この第２の比較器１３の出力端
は、現像剤濃度選択回路２１（第２の設定回路）の入力
端に接続されている。The other input terminals of these first and second comparators 12 and 13 are connected to an upper limit voltage Vh1 of the output voltage of the sensor 10 shown in FIG.
and a lower limit voltage V1 are supplied. That is, a resistor 14, 15 and a variable resistor 16 are connected in series between this source V and the ground, and the connection point between the resistors 14 and 15 is connected to the other input terminal of the first comparator 12, and the resistor A connection point between the variable resistor 15 and the variable resistor 16 is connected to the other input terminal of the second comparator 13. By operating the variable resistor 16, the upper limit voltage ``h1'' and the lower limit voltage ``1'' are adjusted. Further, the output terminal of the first comparator 12 is connected to a resistor 17.
, is connected to the output terminal of the second comparator 13 via a light emitting diode 18, and the connection point between the resistors 14 and 15 is connected to the resistor 1.
9, connected to the output terminal of the second comparator 13 via the light emitting diode 20. The output terminal of this second comparator 13 is connected to the input terminal of a developer concentration selection circuit 21 (second setting circuit).

第２図は現像剤′ａ度遍択回路２１を示すものである。FIG. 2 shows the developer degree selection circuit 21. As shown in FIG.

この現像剤濃度選択回路２１は、判定回路１１と同一構
成であり、第３、第４の比較器１２ａ、１３ａに供給さ
れる基準電圧のみが相違している。つまり、抵抗２２．
２３、可変抵抗２４によって、第３図に示す現像剤の供
給、停止制御の基準レベルを設定する基準電圧Ｖｓｈ、
Ｖｓ　Ｉが設定されるようになっており、可変抵抗２４
を操作することにより基準電圧ｖｓｈ、ＶＳＩが可変で
きるようになってる。尚、第２図において、第１図と同
一部分には、同一符号に添字ａを付して示す。この現像
剤濃度選択回路２１の出力は、制御部２５に供給される
。この制御部２５は動作開始時に、前記設定された基準
電圧Ｖｓｈ％Ｖｓｌが読込まれるようになっており、現
像剤濃度選択回路１１、判定回路２１を介して供給され
るセンサ１０の出力電圧が、前記設定された基準電圧Ｖ
ｓｈ以上となった場合、図示せぬ現像剤収容部の現像剤
を現像器に供給するようにし、基準電圧Ｖｓｌ以下とな
った場合、現像剤の供給を停止するように制御するよう
になっている。This developer concentration selection circuit 21 has the same configuration as the determination circuit 11, and differs only in the reference voltages supplied to the third and fourth comparators 12a and 13a. In other words, resistance 22.
23. A reference voltage Vsh for setting a reference level for developer supply and stop control shown in FIG. 3 by means of a variable resistor 24;
Vs I is set, and the variable resistor 24
The reference voltage vsh and VSI can be varied by operating the . In FIG. 2, the same parts as in FIG. 1 are indicated by the same reference numerals with the suffix a added. The output of this developer concentration selection circuit 21 is supplied to the control section 25. The control unit 25 is configured such that the set reference voltage Vsh%Vsl is read at the start of operation, and the output voltage of the sensor 10 supplied via the developer concentration selection circuit 11 and the determination circuit 21 is , the set reference voltage V
When the voltage exceeds the reference voltage Vsl, the developer in the developer storage section (not shown) is supplied to the developing device, and when the voltage falls below the reference voltage Vsl, the supply of the developer is stopped. There is.

上記構成において、例えば複写機を設置する場合、先ず
、判定回路１１の可変抵抗１６を操作し、発光ダイオー
ド１８．２０がいずれも消灯するよう、センサ１０の検
出出力の上限電圧ｖｈと、下限電圧Ｖ１を設定する。こ
の後、現像剤濃度選択回路２１を構成する可変抵抗２４
を操作し、発光ダイオード１８ａ、２０ａがいずれも消
灯するように基準電圧ＶｓｈＳＶＳ　Ｉを調整する。こ
れにより、センサ１０の検出出力のリニア部分に基準電
圧Ｖｓｈ１ＶＳＩが設定されたこことなる。In the above configuration, for example, when installing a copying machine, the variable resistor 16 of the determination circuit 11 is operated to set the upper limit voltage vh and lower limit voltage of the detection output of the sensor 10 so that both the light emitting diodes 18 and 20 are turned off. Set V1. Thereafter, the variable resistor 24 constituting the developer concentration selection circuit 21
, and adjust the reference voltage VshSVSI so that both the light emitting diodes 18a and 20a are turned off. As a result, the reference voltage Vsh1VSI is set to the linear portion of the detection output of the sensor 10.

上記実施例によれば、現像剤濃度選択回路２１とは別に
、判定回路１１によってセンサ１０より出力される電圧
の上限電圧Ｖｈ１および下限電圧■１を設定し、センサ
１０の出力電圧のリニア部分がこの上限電圧ｖｈと、下
限電圧Ｖ１の相互間に入るようにしている。したがって
、センサ１０の出力電圧がｍｓ器の製造上の誤差や、使
用環境の影響により、大きく変化した場合においても、
センサ出力電圧のリニア部分以外の部分に基準電圧ＶＳ
ｈ、ｖｓ　！が設定されることを防止することができる
ため、現像剤の濃度制御を常時適正に行うことが可能な
ものである。According to the above embodiment, the upper limit voltage Vh1 and the lower limit voltage 1 of the voltage output from the sensor 10 are set by the determination circuit 11 separately from the developer concentration selection circuit 21, and the linear portion of the output voltage of the sensor 10 is set. The voltage is set between the upper limit voltage vh and the lower limit voltage V1. Therefore, even if the output voltage of the sensor 10 changes significantly due to manufacturing errors of the MS device or the influence of the usage environment,
Reference voltage VS is applied to the part other than the linear part of the sensor output voltage.
H, vs! Since it is possible to prevent this from being set, it is possible to properly control the concentration of the developer at all times.

尚、上記実施例では、判定回路１１を現像剤濃度選択回
路２１と、センサ１０との間に設けたが、これに限らず
、例えば現像剤濃度選択回路２１と、制御部２５との間
に設けることも可能である。In the above embodiment, the determination circuit 11 is provided between the developer concentration selection circuit 21 and the sensor 10; however, the present invention is not limited thereto. It is also possible to provide one.

その他、この発明の要旨を変えない範囲において、種々
変形実施可能なことは勿論である。It goes without saying that various other modifications can be made without departing from the gist of the invention.

［発明の効果］ 以上、詳述したようにこの発明によれば、検出手段の検
出出力に所要の範囲を設定し、この範囲内で基準レベル
を設定することにより、現像剤の濃度制御を適正に実行
させることが可能な現像剤濃度検出装置ｅｔを提供でき
る。[Effects of the Invention] As detailed above, according to the present invention, by setting a required range for the detection output of the detection means and setting the reference level within this range, the concentration of the developer can be properly controlled. It is possible to provide a developer concentration detecting device et which can be executed.

【図面の簡単な説明】[Brief explanation of the drawing]

第１図はこの発明に係わる現像剤濃度検出装置の一実施
例を示す回路構成図、第２図は第１図の要部を示す回路
図、第３図は第１図、第２図の動作を説明するために示
す図、第４図はセンサの検出出力を説明するために示す
図である。 １０・・・センサ、１１・・・判定回路、２１・・・現
像剤濃度選択回路。 篇　１　図 ５１・　２図 □）γ−４度 第３ｚ □）ナー濃度 第４図FIG. 1 is a circuit diagram showing an embodiment of the developer concentration detection device according to the present invention, FIG. 2 is a circuit diagram showing the main parts of FIG. 1, and FIG. 3 is a circuit diagram showing the main parts of FIG. FIG. 4 is a diagram shown to explain the operation, and FIG. 4 is a diagram shown to explain the detection output of the sensor. DESCRIPTION OF SYMBOLS 10... Sensor, 11... Judgment circuit, 21... Developer concentration selection circuit. Part 1 Figures 51 and 2 □) γ-4th degree 3z □) Na concentration Figure 4

Claims (3)

【特許請求の範囲】[Claims] （１）現像剤の濃度を検出する検出手段と、この検出手
段の検出出力の上限レベルと、下限レベルを設定する第
１の設定手段と、前記上限レベルと、下限レベルの相互
間に現像剤の濃度制御を行う基準レベルを設定する第２
の設定手段とを具備したことを特徴とする現像剤濃度検
出装置。(1) A detection means for detecting the concentration of the developer, a first setting means for setting an upper limit level and a lower limit level of the detection output of the detection means, and a developer between the upper limit level and the lower limit level. The second step is to set a reference level for controlling the concentration of
What is claimed is: 1. A developer concentration detection device comprising: setting means. （２）第２の設定手段は、第１の設定手段の後段に設け
られることを特徴とする特許請求の範囲第１項記載の現
像剤濃度検出装置。(2) The developer concentration detection device according to claim 1, wherein the second setting means is provided after the first setting means. （３）第２の設定手段は、第１の設定手段の前段に設け
られることを特徴とする特許請求の範囲第１項記載の現
像剤濃度検出装置。(3) The developer concentration detection device according to claim 1, wherein the second setting means is provided before the first setting means.
JP20334786A 1986-08-29 1986-08-29 Detector for concentration of developer Pending JPS6358472A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP20334786A JPS6358472A (en) 1986-08-29 1986-08-29 Detector for concentration of developer

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP20334786A JPS6358472A (en) 1986-08-29 1986-08-29 Detector for concentration of developer

Publications (1)

Publication Number Publication Date
JPS6358472A true JPS6358472A (en) 1988-03-14

Family

ID=16472521

Family Applications (1)

Application Number Title Priority Date Filing Date
JP20334786A Pending JPS6358472A (en) 1986-08-29 1986-08-29 Detector for concentration of developer

Country Status (1)

Country Link
JP (1) JPS6358472A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2011028004A (en) * 2009-07-25 2011-02-10 Konica Minolta Business Technologies Inc Color image forming apparatus

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2011028004A (en) * 2009-07-25 2011-02-10 Konica Minolta Business Technologies Inc Color image forming apparatus
US8260160B2 (en) 2009-07-25 2012-09-04 Konica Minolta Business Technologies, Inc. Color image forming apparatus

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