JPS5875160A - Electrostatic recorder - Google Patents

Electrostatic recorder

Info

Publication number
JPS5875160A
JPS5875160A JP56172811A JP17281181A JPS5875160A JP S5875160 A JPS5875160 A JP S5875160A JP 56172811 A JP56172811 A JP 56172811A JP 17281181 A JP17281181 A JP 17281181A JP S5875160 A JPS5875160 A JP S5875160A
Authority
JP
Japan
Prior art keywords
light
light emitting
emitting diode
photoreceptor
jam
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
JP56172811A
Other languages
Japanese (ja)
Inventor
「あし」田 尚嗣
Yoshitsugu Ashida
Keiichiro Suzuki
圭一郎 鈴木
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.)
Konica Minolta Inc
Original Assignee
Konica Minolta Inc
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 Konica Minolta Inc filed Critical Konica Minolta Inc
Priority to JP56172811A priority Critical patent/JPS5875160A/en
Priority to GB08230504A priority patent/GB2111674B/en
Priority to US06/437,343 priority patent/US4505572A/en
Priority to DE19823240187 priority patent/DE3240187A1/en
Publication of JPS5875160A publication Critical patent/JPS5875160A/en
Pending legal-status Critical Current

Links

Classifications

    • GPHYSICS
    • G03PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03GELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G15/00Apparatus for electrographic processes using a charge pattern
    • G03G15/70Detecting malfunctions relating to paper handling, e.g. jams

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Developing For Electrophotography (AREA)
  • Control Or Security For Electrophotography (AREA)

Abstract

PURPOSE:To improve the detecting performance for jams by disposing a sensor unit wherein plural pieces of light emitting elements and one photodetector are combined to one body in proximity to the surface of a photoreceptor in the position after separation of recording paper. CONSTITUTION:An IR light emitting diode 20b for detecting toner density, a visible light emitting diode 20c for detecting jams, and a phototransistor 20d which detects the light emitted from the diodes 20b, 20c and reflected from a small piece for reference density and outputs as electric signals are embedded respectively at prescribed angles in a supporting body 20a for forming a sensor unit 20. Then the space for mounting and the number of constituting parts are reduced and since visible light is used for detection of jams, the difference in the output levels of the photodetector when a jam is detected changes largely as compared to the case in which IR is used, whereby the detecting performance for jams is improved.

Description

【発明の詳細な説明】 本発明は、簡潔な構成で転写後の記I!1紙のジャム検
知およびトナー濃度検知ができるようにした静電記録装
置に関する。
DETAILED DESCRIPTION OF THE INVENTION The present invention has a simple structure and a post-transfer record I! The present invention relates to an electrostatic recording device capable of detecting a single paper jam and toner concentration.

電子寥真複写機や、あ□る釉の7アクシミリのような電
子写真処理によ□り静電記録を行なう装置が知られてい
る。この種の静電記録装置においては、原稿な電光走査
して得られ6反射光または電気情報信号に基→いて作ら
れた光情報により感光体または誘電体上に原稿または電
気情報の静電&111!を形成し、この静電荷像をトナ
ーを含む現像剤により現像して可視像とし、この可視像
を記録紙忙転写した後定着して記録像を作る。第1図は
この私の静電記録装置の一例として電子写真vIT機の
概略構成を示しており、原稿台1上に載置した原稿Gを
露光ラン12で露光し、原l/kGからの反射光をミラ
ー3m、3bおよび露光スリット4で回転ドラム6上の
感光体5a上に投射し感光体6膳上に原稿Gの静電荷像
を形成する。同転ド゛ラム5の周辺には、感光体5mを
一様に帯電する帝°亀電極6と、現像装置フと、転写電
l1118と、転写後転写紙を感光体15aから分離し
易いようにする分離電極9と、゛転T紙を感光体5aか
ら分離する分離爪lOと、感光体51上に残留する電褐
を除失す6除電電極、11と、感光体5a上に残留する
トナーを除去するクリーニング装置12とが順次配置さ
れている。13は前記分離のための装置の不良などによ
って感光体5mに巻き付いた11搬送され乙記録紙をそ
の表面からの反射光量などにより検出してクリーニング
装置12への紙詰りす7なわちジャムを予測し、防止す
るためのジャム検知手段(以下「ジャムセンサ」という
)である。このジャムセンサ13には、従来赤外光を発
する発光ダイオードと、その反射光を受光して電気信号
を出力するホトトランジスタとから成る反射形ホトセン
サが用いられていた。
2. Description of the Related Art Devices that perform electrostatic recording through electrophotographic processing, such as electronic photocopiers and 7-Axis Millimeter, are known. In this type of electrostatic recording device, electrostatic &111 ! This electrostatic charge image is developed with a developer containing toner to form a visible image, and this visible image is transferred onto a recording paper and then fixed to form a recorded image. Figure 1 shows the schematic configuration of an electrophotographic vIT machine as an example of my electrostatic recording device, in which a document G placed on a document table 1 is exposed by an exposure run 12, and the original l/kG is The reflected light is projected onto the photoreceptor 5a on the rotating drum 6 by the mirrors 3m, 3b and the exposure slit 4, and an electrostatic charge image of the document G is formed on the photoreceptor 6. Around the rotary drum 5, there is a mechanical electrode 6 for uniformly charging the photoreceptor 5m, a developing device, a transfer electric current 1118, and a device for easily separating the transfer paper from the photoreceptor 15a after transfer. a separation electrode 9 for separating the T-paper from the photoreceptor 5a; a separation claw lO for separating the T-paper from the photoreceptor 5a; and a static elimination electrode 11 for removing the electric brown remaining on the photoreceptor 51; A cleaning device 12 for removing toner is sequentially arranged. 13 detects the recording paper 11 that has been conveyed and wrapped around the photoreceptor 5m due to a defect in the separation device, etc., based on the amount of light reflected from its surface, and predicts a paper jam in the cleaning device 12, i.e., a jam. This is a jam detection means (hereinafter referred to as a "jam sensor") for preventing jams. Conventionally, the jam sensor 13 is a reflective photo sensor consisting of a light emitting diode that emits infrared light and a phototransistor that receives the reflected light and outputs an electrical signal.

感光体5a上に形成される静電荷像は現像装置7により
現像されて可視像とされ、可視像はカセットなどの給紙
皿14から給紙装置!5により給紙された記録紙Pに転
写電&Sにより転¥され乙。転寥後記録紙Pは分離電極
91、分離爪lOにより感光体5畠から分離され、搬送
ベルト16により搬送され、定着装置17により加熱定
着されて排紙皿18に排紙される。
The electrostatic charge image formed on the photoreceptor 5a is developed into a visible image by the developing device 7, and the visible image is transferred from the paper feeding tray 14 such as a cassette to the paper feeding device! The paper is transferred to the recording paper P fed by 5 by the transfer electric current &S. After being transferred, the recording paper P is separated from the photoreceptor 5 by the separation electrode 91 and the separation claw 1O, is conveyed by the conveyor belt 16, is heated and fixed by the fixing device 17, and is discharged onto the paper discharge tray 18.

ところで、上記電子写真ll!写機において、現像剤と
して鉄粉などのキャリヤと着色樹脂粉末であるトナーと
から成る二成分系現像剤を用いた場合、複写を何回も経
るに従い、現像剤中のトナーが消費されるのでトナ−1
llIli度、ひいては記録−像濃度が次第に低下して
いく。そこで記録−像濃度を常に一定に保つためにトナ
ーを補給する必要があり、このためにトナー濃度を検知
する方法が極々提案されている。トナー濃度検知方法の
1つに、第2図に示したように、原稿台1の裏側先端部
に基準濃度(たとえば光学反射濃度1.0)の小片19
を張り付けておき、露光工程において原稿露光に先立っ
てこの基準濃度小片”19を電光しく原稿台lの移動方
向を矢印で示す)その静電荷像を感光体5a上に形成し
それを決像して可視像とし、その可視像の濃度を感光体
51に近接して配設した光学的センサ(図示せず)によ
り検知する方法が知られてい己。
By the way, the electronic photo above! When a two-component developer consisting of a carrier such as iron powder and a toner (colored resin powder) is used as a developer in a copying machine, the toner in the developer is consumed as copies are made many times. Toner-1
The recording/image density gradually decreases. Therefore, it is necessary to replenish toner in order to keep the recorded image density constant, and for this purpose, many methods have been proposed for detecting toner density. As shown in FIG. 2, one of the toner density detection methods is to place a small piece 19 of a standard density (for example, optical reflection density 1.0) on the tip of the back side of the document table 1.
In the exposure process, prior to exposing the original, this reference density small piece "19" is illuminated with an electric light (the direction of movement of the original platen l is indicated by an arrow), and an electrostatic charge image thereof is formed on the photoreceptor 5a, which is then resolved. A known method is to detect the density of the visible image using an optical sensor (not shown) disposed close to the photoreceptor 51.

従来、このトナー濃度検知用のセンサは、発光、ダイオ
ードなどの発光素子とホトトランジスタなどの受光素子
とで構成されたものが用いられており、検知光には外来
光による影暢を受けにくく且つ感光体の帯電能力を低下
させないような赤外光が用いられている。また、このト
ナー濃度検知用のセンサはジャムセンサと兼用すること
も知られている。
Conventionally, sensors for detecting toner concentration have been composed of a light-emitting element such as a light-emitting diode and a light-receiving element such as a phototransistor. Infrared light is used that does not reduce the charging ability of the photoreceptor. It is also known that this sensor for detecting toner concentration also functions as a jam sensor.

電子写真処理により静電記録を行なう装置の処理糸とし
て考えたとき、分離後のジャム検知用とトナー濃度検知
用に別々にセンサを設けることは構゛成部品やスペース
上の無駄があるのでそれらを1つのセンサで兼用するこ
とは得策でアErtfi、1つのセンサでジャム検知と
トナー濃度検知とを兼ねる場合、感光体に記録紙が巻き
付いた異常時のセンサ出力レベルと巻き付きがない正常
時のセンサ出力レベルとの差がヰれほど大きくないため
に、その出力レベルが閾値を越えたか否かでジャム検知
をする場合には種々の状況の下では検知が不確実になる
おそれがある。また、センサがトナーで汚れその出力レ
ベルが低下するとジャム検知が不可能になるおそれもあ
6゜ 本発明は上記の点にかんがみ構成部品やスペース上の節
減を考慮し且つジャム検知の際のセンサ出力レベルの変
化を充分に大きくしてジャム検知が確実に行なえるよう
にするため、ジャム検知用の発光素子とトナー濃度検知
用の発光素子およびこれら21/Mの発光素子に対、し
共通の受光素子!1つのセンサユニットとして構成した
ものである。
When considered as a processing thread for a device that performs electrostatic recording through electrophotographic processing, providing separate sensors for jam detection and toner concentration detection after separation would be wasteful in terms of components and space. It is a good idea to use one sensor for both jam detection and toner density detection.If one sensor is used for both jam detection and toner density detection, the sensor output level will be different when there is an error in which the recording paper is wrapped around the photoconductor, and when it is normal without the paper being wrapped around the photoconductor. Since the difference with the sensor output level is not particularly large, if jam detection is performed based on whether or not the output level exceeds a threshold, the detection may become uncertain under various circumstances. In addition, if the sensor becomes dirty with toner and its output level decreases, there is a risk that jam detection will become impossible. In order to ensure a sufficiently large change in output level to ensure jam detection, a common light emitting element for jam detection, a light emitting element for toner concentration detection, and these 21/M light emitting elements is used. Light receiving element! It is configured as one sensor unit.

以下図面に基づいて本発明を説明す!1゜第3図は本発
明による静電記録装置に用いるセンサユニットの一実施
例を示しており、センサユニット20は成形支持体20
mにトナー濃度検知用赤外光発光ダイオード20bと、
ジャム検知開角視光発光ダイオード20cと、これらの
発光ダイオード20bおよび20cから発光された光が
記録紙または基準濃度小片19により反射された反射光
を受光して電気信号として出力するホトトランジスタ2
0dとがそれぞれ所定の角度で埋込まれている・ホ))
ランジスタ20dの配置角度の好ましい一飼としては、
トナー濃度検知用の赤外光発光ダイオード20bの正反
射光が入光し易く且つジオ人検知用の可視光発光ダイオ
ード20cの正反射光が入光しにくい角度であ6oこの
センサユニツ)20は、たとえば第1図に示じた電子寥
真wI寥機のジャムセンサ13の位置に配置される。
The present invention will be explained below based on the drawings! 1. FIG. 3 shows an embodiment of the sensor unit used in the electrostatic recording device according to the present invention, in which the sensor unit 20 is attached to a molded support 20.
m, an infrared light emitting diode 20b for toner concentration detection;
A jam detection opening angle viewing light emitting diode 20c, and a phototransistor 2 that receives the reflected light emitted from these light emitting diodes 20b and 20c and is reflected by the recording paper or the reference density piece 19 and outputs it as an electrical signal.
0d and are embedded at predetermined angles・E))
A preferred arrangement angle of the transistor 20d is as follows:
This sensor unit 20 is located at an angle where the specularly reflected light of the infrared light emitting diode 20b for detecting toner concentration is likely to enter, and the specularly reflected light of the visible light emitting diode 20c for geo-person detection is difficult to enter. For example, it is placed at the position of the jam sensor 13 of the electronic camera wI camera shown in FIG.

第4図は上記センサユニットを用いた検知回路の一実施
剥である。
FIG. 4 shows an implementation of a detection circuit using the above sensor unit.

センサユニツ)20は赤外光発光ダイオード20bと、
口f視光発光ダイオード20cと、ホトトランジスタ2
0dと−より構成されており、これらの発光ダイオード
20bおよび20cのアノード側と、ホトトランジスタ
20dのコレクタ端子は共通して電#VCCに接続され
、発光ダイオード20be20cのカソード端子はそれ
ぞれ抵抗Rr 、Rgを介して駆動トランジスタFJ 
t TRHのコレクタに接続され、ホトトランジスタ2
0dのエミッタ端子はオペアンプ21の反転入力端子に
接続されている。トランジスタTRr ITRmのエミ
ッタは接地され、ベースに発光ダイオード駆動信号81
 * 81がそれぞれ与えられる。オペアンプ21の非
反転入力端子は電源VCCとアースとのアースとの間に
接続され1)圧抵抗R1とR4との接続点に接続され、
オペアンプ21の出力端子はコンパレータ22および2
3の反転入力端子に接続されるとともに抵抗電を介して
それ自身の反転入力端子に接続されている。フンパレー
タ22の非反転入力端子は電源vccとアースとの間に
接続された分圧幹抗R−とR1との接続点−(vJ電圧
)に接続され、コンパレータ23の非反転入力端子は同
様の分圧抵抗R,とR−との接続点(Vn電圧)に接続
されている。
The sensor unit) 20 includes an infrared light emitting diode 20b,
Portable light emitting diode 20c and phototransistor 2
The anode sides of these light emitting diodes 20b and 20c and the collector terminal of the phototransistor 20d are commonly connected to the voltage VCC, and the cathode terminals of the light emitting diodes 20be and 20c are connected to resistors Rr and Rg, respectively. Drive transistor FJ through
t Connected to the collector of TRH, phototransistor 2
The emitter terminal of 0d is connected to the inverting input terminal of the operational amplifier 21. The emitter of the transistor TRr ITRm is grounded, and the light emitting diode drive signal 81 is connected to the base.
* 81 are given respectively. The non-inverting input terminal of the operational amplifier 21 is connected between the power supply VCC and the ground, and 1) is connected to the connection point between piezoresistors R1 and R4;
The output terminal of the operational amplifier 21 is connected to the comparators 22 and 2.
3 and to its own inverting input terminal via a resistor. The non-inverting input terminal of the comparator 22 is connected to the connection point - (vJ voltage) between the voltage dividing main resistor R- and R1 connected between the power supply VCC and the ground, and the non-inverting input terminal of the comparator 23 is connected to a similar connection point - (vJ voltage). It is connected to the connection point (Vn voltage) between the voltage dividing resistors R and R-.

次に上紀検知回Vδの動作を第5図を参廁して説明する
。正常時(ジャムなし)には、回転ド9ム5(第1[)
48照)が回転してセンサユニット20の位置に基準濃
度小片19の可視像(1次画像)Rが達したときトラン
ジスタTRt K駆&蕪号S1を与えて赤外光発光ダイ
オード20bをJl[させる。ホトトランジスタ20d
はこの光による基準濃度小片19の可視像Rからの反射
光を受光しオペアンプ21からその濃1に応じた電圧↓
ペルVムを出力しコンパレータ22および23に人力す
る。コンパレータ23において、予め分圧抵抗R1# 
RI Kより定められるトナー濃度基準電圧vDと比較
され、検出した濃度がトナー濃度基準以上であればVム
電圧は低下し、端子11K H信号をまたトナー濃度基
準以上であればL信号を出力する◎このトーナー濃度信
号は第5図にボしたタイヤングTlで読み込まれる。
Next, the operation of the upper period detection cycle Vδ will be explained with reference to FIG. Under normal conditions (no jam), the rotary drum 9 5 (1st [)
When the visible image (primary image) R of the reference density small piece 19 is rotated and the visible image (primary image) R of the reference density small piece 19 reaches the position of the sensor unit 20, the transistor TRt, K drive & turn signal S1 is applied, and the infrared light emitting diode 20b is turned to Jl. [Let. Phototransistor 20d
receives the reflected light from the visible image R of the reference density small piece 19 due to this light, and outputs a voltage from the operational amplifier 21 according to its density ↓
The pulse voltage is output and input to comparators 22 and 23 manually. In the comparator 23, the voltage dividing resistor R1#
It is compared with the toner concentration reference voltage vD determined by RIK, and if the detected density is higher than or equal to the toner concentration reference, the voltage V is lowered, and the terminal 11K outputs an H signal, and if it is higher than or equal to the toner concentration reference, an L signal is output. ◎This toner density signal is read at the timing Tl shown in FIG.

その後所定時間経過するとセンサユニット加の位置に転
V後の感光体5暑上の画像領域Tが到達する・このタイ
ミングに合わせてトランジスタTR,に駆動信号8雪を
与えて可視光発光ダイオ−′ド20cを発光させる・ホ
トトランジスタ20dはこの光の感光体51からの反射
光゛を受光し1オペアンプ21からの出力をコンパレー
タ22および23に人力する。分離に失敗して回転ドラ
ム5上に記録紙が巻き付いてい乙とオペアンプ21の出
力Vムが低下し、その出力レベルが分圧抵抗R6および
Rマによってきまるジャム検出基準電圧■Jより小ざく
な6のでコンパレータ2−2の端子Aには′HI信号が
出窄する。これに対して分離が正常−行なわれるとオペ
アンプ21の出力vAが低下せずその出力レベルがV。
After a predetermined period of time has elapsed, the image area T on the photoreceptor 5 reaches the position where the sensor unit is applied. At this timing, a drive signal 8 is applied to the transistor TR, and the visible light emitting diode is activated. The phototransistor 20d causes the light source 20c to emit light. The phototransistor 20d receives the reflected light from the photoreceptor 51 and inputs the output from the first operational amplifier 21 to the comparators 22 and 23. If separation fails and the recording paper wraps around the rotating drum 5, the output Vm of the operational amplifier 21 decreases, and the output level becomes smaller than the jam detection reference voltage J determined by the voltage dividing resistors R6 and R. 6, the 'HI signal appears at the terminal A of the comparator 2-2. On the other hand, if the separation is performed normally, the output vA of the operational amplifier 21 will not drop and its output level will be V.

より小さくならないので端子Aには L信号が出力する
。このジャム検知信号は第5図に示したタイミングTI
で読み込まれる。本実施飼では前記ドナ−1a夏検知用
赤外光発光ダイオードおよびジャム検知用可視光発光ダ
イオードは直流点灯させたが9、感光体の疲労などを考
慮して、いわゆ6パルス点灯させてもよい。
Since it does not become smaller, an L signal is output to terminal A. This jam detection signal is generated at the timing TI shown in FIG.
is loaded with. In this experiment, the donor 1a infrared light emitting diode for summer detection and visible light emitting diode for jam detection were lit with direct current9, but in consideration of fatigue of the photoreceptor, so-called 6-pulse lighting was also used. good.

第6図は本発明のセンサユニツ)Kよるジャム検知性能
を従来的と比較したもので、0)は可視光を用いた本発
明によるセンサユニットの場合、(ロ)は赤外光発光ダ
イオードとホトトランジスタとから成己従来のジャム竜
ンサの場合であり、これに対し#4図に示した検知回路
のオペアンフ21の出力電圧レベルV^の変化を表わし
ている。この図かられかるように1本発明による光学ユ
ニットを用いた場合の方が、感光体に対するV直電圧で
あるV、と記録紙に対する■直電圧である7重または第
2原図に対する■直電圧であ6 Vsとの出力レベル差
ΔV、Δv1が大きくなることがわかり、ジャム検知性
能が向上する。
Figure 6 compares the jam detection performance of the sensor unit) K of the present invention with that of a conventional sensor unit. This is the case of a conventional jam detector made up of transistors, and shows the change in the output voltage level V^ of the operational amplifier 21 of the detection circuit shown in Figure #4. As can be seen from this figure, in the case of using the optical unit according to the present invention, V, which is the direct voltage to the photoreceptor, and It can be seen that the output level differences ΔV and Δv1 from 6Vs become larger, and the jam detection performance improves.

このように可視光を用い乙と感光体(vl)と記録紙(
V冨)または第2原紙(■1)との出力レベル差がゝ赤
外光を用いた場合より大きくなるがその理由は次のよう
に考えられる。
In this way, visible light is used to connect B, photoreceptor (vl), and recording paper (
The difference in output level between the first base paper and the second base paper (■1) is larger than when infrared light is used, and the reason for this is thought to be as follows.

発光ダイオードから感光体5mに投射された光は感光体
5a上に残留トナーが付着している場合はそのトナーに
より一部が吸収され、感光体5aK直接投射された光は
感光体!I―で一部が反射され残部は感光体を透過し回
転ドラム6のドラム面で反射され、これらの反射光が合
成されてホトトランジスタに受光される。一方、感光体
5烏上に記録紙が巻き付いている場合は、発光ダイオー
ドからの投射光の大部分はその記録紙により反射され、
記録紙を透過して感光体に達する光は殆んとない。
If there is residual toner on the photoconductor 5a, part of the light projected from the light emitting diode onto the photoconductor 5m is absorbed by the toner, and the light directly projected onto the photoconductor 5aK is absorbed by the photoconductor 5a! A part of the light is reflected by I-, and the remaining part is transmitted through the photoreceptor and reflected by the drum surface of the rotating drum 6, and these reflected lights are combined and received by the phototransistor. On the other hand, when recording paper is wrapped around the photoreceptor 5, most of the light projected from the light emitting diode is reflected by the recording paper.
Almost no light passes through the recording paper and reaches the photoreceptor.

ところで感光体5aにたとえば無定形セレンを用いた場
合の光の波長と反11−j率との関係および光の99%
がhaされ6層の厚さとの関係をそれぞれ第7図および
第8図に示したがこれらの図かられかるように1波長域
700 nm−1000nm程度の光に対しては反射率
は11520 %であり、一方、光の99%が吸収され
る層の厚さに関しては可視光(波長域400 nm 〜
700 nm ) K対しては感光体5aの厚みが数1
0μ以上あれば殆んど大部分が吸収されてしまう。従っ
て、本発明のように発光波長が可視光域であればドラム
表面での反射光は非常に小さくなり、逆にその分だけ感
光体5aからの反射光による電圧出力レベルと記録紙か
らの反射光による電圧出力レベルとの差を大きくとるこ
とかでき第6図←)に示すようにな6oこれに対して従
来の赤外光を用いた場合は感光体Smからの反射光と記
録紙かうの反射光との差従ってそれらによる電圧中力レ
ベルの差が小さくなるため第6図←)に示すようになり
、ジャム検知性能が劣る。
By the way, the relationship between the wavelength of light and the inverse 11-j ratio when amorphous selenium is used for the photoreceptor 5a, and the 99% of the light
Figures 7 and 8 show the relationship between the thickness of the six layers and the thickness of the six layers, respectively.As can be seen from these figures, the reflectance is 11520% for light in one wavelength range of about 700 nm to 1000 nm. On the other hand, regarding the thickness of the layer where 99% of light is absorbed, visible light (wavelength range 400 nm ~
700 nm) For K, the thickness of the photoreceptor 5a is several 1
If it is 0μ or more, most of it will be absorbed. Therefore, if the emission wavelength is in the visible light range as in the present invention, the reflected light on the drum surface will be very small, and conversely, the voltage output level due to the reflected light from the photoreceptor 5a and the reflection from the recording paper will be correspondingly small. By contrast, when conventional infrared light is used, the difference between the voltage output level from the photoreceptor Sm and the recording paper can be made large, as shown in Figure 6←). Since the difference between the reflected light and the voltage neutrality level due to these differences becomes small, as shown in FIG. 6 ←), the jam detection performance is inferior.

本発1jKおけるセンサユニットの発光素子は土で説明
したように直流電源で点灯さゼてもよいし、短い周期の
パルスで点灯させてもよい。
The light-emitting element of the sensor unit in the main sensor unit 1jK may be lit by a DC power source as explained in the previous section, or may be lit by short-cycle pulses.

また、発光素子と受光素子との配置は上で説明したほか
に1ジャム検知用発光ダイオードからの可視光およびト
ナー濃度検知用発光ダイオードからの赤外光の正反射光
が入りにくい角度にしてもよい0ざらに上記集施例では
トナー濃度を検知する手段として基準濃度小片を用いた
が、本発明は他の手段によっても可能である。また、セ
ンサユニットの発光素子は2つKlられず複数個設ける
ことができ、その場合発光素子から発光する光の波長は
検知対象に応じて任意に変えることができる。
In addition to the above-mentioned arrangement, the light-emitting element and light-receiving element may be arranged at an angle that prevents regular reflection of visible light from the jam detection light-emitting diode and infrared light from the toner concentration detection light-emitting diode from entering. In addition, in the above-mentioned embodiments, a reference density piece is used as a means for detecting toner density, but the present invention can be implemented using other means. Further, the sensor unit may have a plurality of light emitting elements instead of just two, and in that case, the wavelength of the light emitted from the light emitting elements can be arbitrarily changed depending on the object to be detected.

以上説明したように1本発11においては、複数個の発
光素子とそれらの発光素子から出る光の反射光を受光す
る1つの受光素子とを1つのユニットとして*&したの
で、取イJけスペースおよび構成部品数の節減を図るこ
とができるとともKs 1つの発光素子をジャム検知用
に用いて可視光を発光させ、もう1つの発光素子をトナ
ーm腹検知用に用いて赤外光を発光させることにより、
従来のジャム検知用に赤外光を用いていた場合に比べて
ジャム検知時の受光素子の出力レベル差が大きく変化す
るためジャム検知性能が向上する。
As explained above, in the single light emitting device 11, a plurality of light emitting elements and one light receiving element that receives the reflected light emitted from the light emitting elements are considered as one unit. It is possible to save space and the number of components.One light-emitting element is used for jam detection to emit visible light, and the other light-emitting element is used to detect toner mounds and emits infrared light. By emitting light,
Compared to the conventional case where infrared light is used for jam detection, the output level difference of the light receiving element changes greatly when a jam is detected, so the jam detection performance is improved.

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

第1図&1子写真Il!写様の概略構成図、第2図はト
ナー濃度検知手段の一部を構成する原槁台J!ll[I
の基準*11層、第3図は本発明による静電記録装置の
センサユニットの構1#、第4図は本発明におけるセン
サユニットを用いた検知回路、1jh5図は検知回路の
動作を示すタイムチャート、第6図は本発明におけるセ
ンサユニット)Kよるジャム検知性能と従来のジャムセ
ンサによるジャム検知性能との比較を示す図、第7図は
感光体に当る光の波長とその反射率との関係を示す図、
第8図は感光体に当る光の波長と光の99%が吸収され
る層の厚さとの関係を示す図である。 l・・・原稿台、2・・・総光ランプ、3a13b・・
・ミラー、4・・・露光スリット、5・・・回転ドラム
、5m・・・感光体、6・・・帯I!電極、7・・・現
像装置、8・・・転¥電極、9・・・分陰電極、10・
・・分離爪、11・・・除電11E&、 12 ・・・
クリーニング装置、13・・・ジャム検知手&(ジャム
センサ)、14・・・bat皿、15・・・給紙I&!
&、16・・・搬送ベルト、17・・・定着装置、18
・・・排紙皿、19・・・基準温度小片、20・・・セ
ンサユニツ)、−20a・・・成形支持体、20b・・
・トナー濃度検知用赤外光発光ダイオード、20c・・
・ジャム検知用可視光発光ダイオード、20d・・・ホ
トトランジスタ、21・・・オペアンプ、22.23・
・・コンパ:レータ。 特許出願人 小自大写真工業株式会社 代理人弁理土鈴木弘男 第1図 第2図 501− 第3図 0 第5図 第6図 第7図 液長(nm) 第8図 深長(nm)
Figure 1 & 1 child photo Il! The schematic configuration diagram of the photo, Figure 2, is a J! ll[I
Standard *11 layers, Figure 3 shows the structure 1# of the sensor unit of the electrostatic recording device according to the present invention, Figure 4 shows the detection circuit using the sensor unit according to the present invention, and Figure 1jh5 shows the timing diagram showing the operation of the detection circuit. 6 is a diagram showing a comparison between the jam detection performance of the sensor unit) K in the present invention and the jam detection performance of a conventional jam sensor, and FIG. 7 is a diagram showing the relationship between the wavelength of light hitting the photoreceptor and its reflectance. A diagram showing the relationship,
FIG. 8 is a diagram showing the relationship between the wavelength of light impinging on the photoreceptor and the thickness of the layer in which 99% of the light is absorbed. l...Original table, 2...Full light lamp, 3a13b...
・Mirror, 4...Exposure slit, 5...Rotating drum, 5m...Photoconductor, 6...Band I! Electrode, 7... Developing device, 8... Transfer electrode, 9... Cathodic electrode, 10.
...Separation claw, 11...Static charge removal 11E&, 12...
Cleaning device, 13...jam detection hand & (jam sensor), 14...bat plate, 15...paper feed I&!
&, 16... Conveyor belt, 17... Fixing device, 18
... paper discharge tray, 19 ... reference temperature piece, 20 ... sensor unit), -20a ... molded support, 20b ...
・Infrared light emitting diode for toner concentration detection, 20c...
・Visible light emitting diode for jam detection, 20d... Phototransistor, 21... Operational amplifier, 22.23.
··comparator. Patent applicant Kojidai Photo Industry Co., Ltd. Attorney Hiroo Tsuchi Suzuki Figure 1 Figure 2 501- Figure 3 0 Figure 5 Figure 6 Figure 7 Liquid length (nm) Figure 8 Depth length (nm)

Claims (1)

【特許請求の範囲】 一(1)I!数個の発光素子とこれらの発光素子から発
光された光の反射光を受光する1つの受光棄子とを一体
に設けて成るセンサユニットを、記録紙分11mの位置
に感光体表面に近接して配置したことを特徴とする静電
記録装置。 (2)前記被数個の発光素子の各々が異なる波長の光を
発光することを特徴とする特許請求の範囲第1項に記載
の静電記鎧装f6 (3)  前記vII数個の発光素子の1つが記録紙の
ジャム検知用可視光発光ダイオードであり、さらに別の
発光素子がトナー濃度検知用赤外光発光ダイオードであ
ることを特徴とする特許請求の範囲第2項に記載の静電
記録装置。
[Claims] 1(1) I! A sensor unit integrally provided with several light-emitting elements and one light-receiving element that receives reflected light emitted from these light-emitting elements was placed close to the surface of the photoreceptor at a distance of 11 m from the recording paper. An electrostatic recording device characterized in that it is arranged at (2) The electrostatic memory armor f6 according to claim 1, wherein each of the plurality of light emitting elements emits light of a different wavelength. (3) The plurality of light emitting elements of the vII The static light emitting diode according to claim 2, wherein one of the elements is a visible light emitting diode for detecting a jam of recording paper, and another light emitting element is an infrared light emitting diode for detecting toner concentration. Electric recording device.
JP56172811A 1981-10-30 1981-10-30 Electrostatic recorder Pending JPS5875160A (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
JP56172811A JPS5875160A (en) 1981-10-30 1981-10-30 Electrostatic recorder
GB08230504A GB2111674B (en) 1981-10-30 1982-10-26 Monitoring in electrostatic reproducing apparatus
US06/437,343 US4505572A (en) 1981-10-30 1982-10-28 Electrostatic reproducing apparatus
DE19823240187 DE3240187A1 (en) 1981-10-30 1982-10-29 ELECTROSTATIC REPLACEMENT DEVICE

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP56172811A JPS5875160A (en) 1981-10-30 1981-10-30 Electrostatic recorder

Publications (1)

Publication Number Publication Date
JPS5875160A true JPS5875160A (en) 1983-05-06

Family

ID=15948807

Family Applications (1)

Application Number Title Priority Date Filing Date
JP56172811A Pending JPS5875160A (en) 1981-10-30 1981-10-30 Electrostatic recorder

Country Status (1)

Country Link
JP (1) JPS5875160A (en)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US37711A (en) * 1863-02-17 Improvement in apparatuses for clasping hoops to ladies skirts
JPS5246850B1 (en) * 1971-05-29 1977-11-28
JPS54155054A (en) * 1978-05-27 1979-12-06 Ricoh Co Ltd Detector

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US37711A (en) * 1863-02-17 Improvement in apparatuses for clasping hoops to ladies skirts
JPS5246850B1 (en) * 1971-05-29 1977-11-28
JPS54155054A (en) * 1978-05-27 1979-12-06 Ricoh Co Ltd Detector

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