JPS60232579A - Electrophotographic system - Google Patents
Electrophotographic systemInfo
- Publication number
- JPS60232579A JPS60232579A JP59088670A JP8867084A JPS60232579A JP S60232579 A JPS60232579 A JP S60232579A JP 59088670 A JP59088670 A JP 59088670A JP 8867084 A JP8867084 A JP 8867084A JP S60232579 A JPS60232579 A JP S60232579A
- Authority
- JP
- Japan
- Prior art keywords
- toner
- value
- information
- sensor
- surface 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
- G03G15/06—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
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Dry Development In Electrophotography (AREA)
- Control Or Security For Electrophotography (AREA)
- Fax Reproducing Arrangements (AREA)
Abstract
Description
【発明の詳細な説明】 （技術分野） 本発明は電子写真方式に関する。[Detailed description of the invention] (Technical field) The present invention relates to electrophotography.
（従来技術）
従来の電子写真方式においては、感光体ドラム表面に現
像されたトナーの量を測オし、そのトナー量を基にトナ
ーが任意に設定された基準レベルより多い場合は、現像
器内にトナーを補給せず、一方、トナーが該基準レベル
より少ない場合は。(Prior art) In the conventional electrophotographic method, the amount of toner developed on the surface of the photoreceptor drum is measured, and if the amount of toner exceeds an arbitrarily set standard level based on the measured toner amount, the developing device However, if the toner is less than the reference level.
現像器内にトナーを補給して現像器内のトナー濃度を一
定に保つようにトナー濃度を制御している。The toner density is controlled so that toner is replenished into the developing device and the toner density within the developing device is kept constant.
このように、感光体ドラム上に現像されたトナー量を基
に１間接的にトナー濃度を制御するため。In this way, the toner density is indirectly controlled based on the amount of toner developed on the photoreceptor drum.
感光体ドラムが記録を重ねることによる帯電特性の劣化
が生じた場合、現像プロセスの帯電条件が異なるため、
感光体ドラム表面に現像されるトナー量に影響を与え、
実際の現像器内のトナー濃度とは異なった情報をもたら
し、トナー濃度制御が正常動作しなくなるという欠点が
あった。If the charging characteristics of the photoreceptor drum deteriorates due to repeated recording, the charging conditions of the developing process will be different.
Affects the amount of toner developed on the photoreceptor drum surface,
This has the disadvantage that it provides information different from the actual toner concentration in the developing device, and toner concentration control does not operate normally.
（発明の目的）
本発明の目的は、上記欠点を除去し、感光体の帯電特性
が劣化してもトナー濃度を常に一定にすることのできる
電子写真方式を提供することにある。(Object of the Invention) An object of the present invention is to provide an electrophotographic method that eliminates the above-mentioned drawbacks and can always maintain a constant toner concentration even if the charging characteristics of a photoreceptor deteriorate.
（発明の構成）
本発明の電子写真方式は、感光体ドラムを帯電器により
帯電し現像器でトナーを現像し転写器で紙に転写する電
子写真方式において、前記感光体ドラムに現像されたト
ナー量を測定して第一の電気信号とする第一のセンサと
、前記感光体ドラムの表面の電位を測定して第二の電気
信号とする第二のセンサと、前記第一、第二の電気信号
を比較して前記現像器に供給するトナー量を制御する手
段ｌとを有することを特徴とするものである。(Structure of the Invention) The electrophotographic method of the present invention is an electrophotographic method in which a photoreceptor drum is charged by a charger, the toner is developed by a developer, and the toner is transferred to paper by a transfer device. a first sensor that measures the potential of the surface of the photoreceptor drum and generates a second electric signal; The apparatus is characterized by comprising means 1 for comparing electrical signals and controlling the amount of toner supplied to the developing device.
（実施例） 次に本発明の実施例について図面を参照して説明する。(Example) Next, embodiments of the present invention will be described with reference to the drawings.
第１図に本発明の実施例を示す構成図である。FIG. 1 is a configuration diagram showing an embodiment of the present invention.
感光体ドラムｌは、帯電器２により帯電され、一定光量
の光線４で露光される。現像器５で現像され、トナーが
ドラム表面から転写器７で紙に転写されてはく離器８で
紙がドラムからはく離する。The photosensitive drum 1 is charged by a charger 2 and exposed to a light beam 4 of a constant amount. The toner is developed by a developing device 5, the toner is transferred from the drum surface onto paper by a transfer device 7, and the paper is peeled off from the drum by a peeling device 8.
紙に転写されない部分に露光、現像されたトナー量を読
みとる反射形センサ（光、超音波などを利用）９の情報
とによシ現像器５内のトナー量を推測し、任意に設定し
た基準レベルより多いか少ないかＫよりトナーボックス
６より現像器５内へトナーを補給したりしなかったりす
ることによりトナー濃度制御する。帯電器２の後に設け
た表面電位センサ３が検出する表面電位情報ｌに応じて
トナーを補給するか否かを決める基準レベルを変動させ
るとともにトナー濃度が一定値になるように正確に制御
する。Based on information from a reflective sensor (using light, ultrasonic waves, etc.) 9 that reads the amount of toner that has been exposed and developed on areas that are not transferred to paper, the amount of toner in the developing device 5 is estimated and an arbitrarily set standard is set. The toner density is controlled by supplying or not supplying toner from the toner box 6 into the developing device 5 based on whether it is more or less than the level. A reference level for determining whether or not toner is to be replenished is varied in accordance with surface potential information l detected by a surface potential sensor 3 provided after the charger 2, and the toner concentration is accurately controlled to a constant value.
第２図に第１図中のセンサ部の回路図を示す。FIG. 2 shows a circuit diagram of the sensor section in FIG. 1.
第２図では表面電位センサ９からのセンサ出力情報１０
、分圧用の抵抗１２，１３．補正用の抵抗】４、トナー
量を読みとる反射形センサ９からの出力情報１１．コン
パレータ１５を含む。In FIG. 2, sensor output information 10 from the surface potential sensor 9
, voltage dividing resistors 12, 13 . [Resistance for correction] 4. Output information from the reflective sensor 9 that reads the amount of toner 11. It includes a comparator 15.
感光体ドラム上の表面電位センサより表面電位に比例し
た電圧値がセンサ出力情報１０として入力される。セン
サ出力情報は、その電圧値に応じて抵抗１２，１３．１
４より分圧され要領をコンパレータ１５の正相人力に入
力する。この値がトナー量の多少を判断する基準レベル
であり、センサ出力情報ｌＯの値に応じてあらかじめ評
価検討により決められた値になるよう抵抗１２，１３゜
１４の値を設定する。一方、反射形センサからの出力情
報１１はコンパレータ１５の逆相入力に入力し、前記基
準レベルと比較する。これによりコンパレータ１５はト
ナー量の多少を決定し、その出力値１６を図示しない制
御基板へ伝えるか、そのままリレーなどによりトナー補
給機構を動作させトナー濃度制御をする。A voltage value proportional to the surface potential is input as sensor output information 10 from a surface potential sensor on the photoreceptor drum. Sensor output information is transmitted through resistors 12 and 13.1 depending on the voltage value.
The voltage is divided from 4 and inputted into the positive phase input of the comparator 15. This value is a reference level for determining the amount of toner, and the values of the resistors 12, 13 and 14 are set so as to be a value determined in advance through evaluation study according to the value of the sensor output information IO. On the other hand, the output information 11 from the reflective sensor is input to the negative phase input of the comparator 15 and compared with the reference level. As a result, the comparator 15 determines the amount of toner and transmits the output value 16 to a control board (not shown), or directly operates a toner replenishing mechanism using a relay or the like to control toner concentration.
（発明の効果）
以上のように本発明は、表面電位の値に応じトナー濃度
制御の基準レベルを変化させることによ〕、感光体の帯
電特性の劣化によらず絶えずトナー濃度を一定にすると
いう効果をもたらすものである。(Effects of the Invention) As described above, the present invention constantly maintains the toner density by changing the reference level for toner density control according to the value of the surface potential, regardless of the deterioration of the charging characteristics of the photoreceptor. This brings about this effect.
第１図は本発明の実施例を示す構成図、第２図は第１図
中のセンサ部を示す回路図である。
ｌ・・・・・・感光体ドラム％２・・・・・・帯電器、
３・・・・・・表面電位センサ、５・・・・・・現像器
、６・・・・・・トナーボックス、７・・・・・・転写
器、８・・・・・・はく離器、９・・・・・・トナー量
読みとりセンサ、１２，１３．１４・・・・・・抵事１
い
誉２０
１ρFIG. 1 is a configuration diagram showing an embodiment of the present invention, and FIG. 2 is a circuit diagram showing a sensor section in FIG. 1. l...Photoreceptor drum%2...Charger,
3...Surface potential sensor, 5...Developer, 6...Toner box, 7...Transfer device, 8...Peeler , 9...Toner amount reading sensor, 12,13.14...Resistance 1
Iho 20 1ρ
Claims (1)
像尤転写器で紙に転写する電子写真方式において、前記
感光体ドラムに現像されたトナー量を測定して第一の電
気信号とする第一のセンサと、前記感光体ドラムの表面
の電位を測定して第二の電気信号とする第二のセンサと
、前記第一。 第二の電気信号を比較して前記現像器に供給するトナー
量を制御する手段とを有することを特徴とする電子写真
方式。[Scope of Claims] In an electrophotographic method in which a photoreceptor drum is charged by a charger, toner is developed by a developer, and then transferred to paper by a transfer device, the amount of toner developed on the photoreceptor drum is measured and the first a first sensor that measures the electric potential of the surface of the photoreceptor drum and generates a second electric signal; An electrophotographic method comprising: means for comparing second electric signals to control the amount of toner supplied to the developing device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP59088670A JPS60232579A (en) | 1984-05-02 | 1984-05-02 | Electrophotographic system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP59088670A JPS60232579A (en) | 1984-05-02 | 1984-05-02 | Electrophotographic system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS60232579A true JPS60232579A (en) | 1985-11-19 |
Family
ID=13949249
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP59088670A Pending JPS60232579A (en) | 1984-05-02 | 1984-05-02 | Electrophotographic system |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS60232579A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH05224498A (en) * | 1991-09-05 | 1993-09-03 | Xerox Corp | Esv reading of toner test patch for adjusting read value of ird of developed test patch |
-
1984
- 1984-05-02 JP JP59088670A patent/JPS60232579A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH05224498A (en) * | 1991-09-05 | 1993-09-03 | Xerox Corp | Esv reading of toner test patch for adjusting read value of ird of developed test patch |
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