JPS6338967A - Toner concentration control method in electrophotographic device - Google Patents
Toner concentration control method in electrophotographic deviceInfo
- Publication number
- JPS6338967A JPS6338967A JP18262586A JP18262586A JPS6338967A JP S6338967 A JPS6338967 A JP S6338967A JP 18262586 A JP18262586 A JP 18262586A JP 18262586 A JP18262586 A JP 18262586A JP S6338967 A JPS6338967 A JP S6338967A
- Authority
- JP
- Japan
- Prior art keywords
- toner
- output
- toner concentration
- magnetic sensor
- bias 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.)
- Granted
Links
- 238000000034 method Methods 0.000 title claims abstract description 35
- 238000004140 cleaning Methods 0.000 claims abstract description 17
- 238000001514 detection method Methods 0.000 claims abstract description 8
- 108091008695 photoreceptors Proteins 0.000 description 12
- 230000003287 optical effect Effects 0.000 description 5
- 230000005856 abnormality Effects 0.000 description 4
- 230000035699 permeability Effects 0.000 description 3
- 238000003756 stirring Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 241000972773 Aulopiformes Species 0.000 description 1
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 1
- BUGBHKTXTAQXES-UHFFFAOYSA-N Selenium Chemical compound [Se] BUGBHKTXTAQXES-UHFFFAOYSA-N 0.000 description 1
- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 description 1
- 210000000436 anus Anatomy 0.000 description 1
- 239000000969 carrier Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000001678 irradiating effect Effects 0.000 description 1
- 239000000696 magnetic material Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 235000019515 salmon Nutrition 0.000 description 1
- 239000011669 selenium Substances 0.000 description 1
- 229910052711 selenium Inorganic materials 0.000 description 1
- 239000004065 semiconductor Substances 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
- G03G15/06—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
- G03G15/0853—Detection or control means for the developer concentration the concentration being measured by magnetic means
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Dry Development In Electrophotography (AREA)
Abstract
Description
【発明の詳細な説明】
も１旦へ五皿丈」
本発明は電子写真装置、すなわち例えば２回転１コピー
の如き現像もしくはクリーニング８！！能を実施するた
めの現像兼クリーニング手段を有し、かつ反転現像を行
なう電子写真装置に於けるトナーｉ良度のコントロール
方法に関するものである。DETAILED DESCRIPTION OF THE INVENTION The present invention is applicable to an electrophotographic apparatus, that is, for example, development or cleaning such as 2 rotations and 1 copy. ! The present invention relates to a method for controlling the quality of toner i in an electrophotographic apparatus which has a developing and cleaning means for carrying out the function and performs reversal development.
Ａ＆へ皮肛
これまで本発明者等は、トナーの浪費を防止し装置をコ
ンパクトに構成することが出来、しかもコンピュータ等
からの画像情報をレーザ光等により書込んでハードコピ
ーとすることが出来る電子写真装置として、感光体上に
光情報を照射して、これに対応する静電潜像を形成し、
該静電潜像を磁気ブラシ現像装置により反転現像して記
録体に転写し、上記感光体上の残留トナーを上記磁気ブ
ラシ現像装置によりクリーニングする電子写真装置を開
発してきた。A&He skin anus The inventors of the present invention have thus far been able to prevent wastage of toner, make the device compact, and also be able to write image information from a computer or the like using a laser beam or the like to make a hard copy. As an electrophotographic device, a photoreceptor is irradiated with optical information to form a corresponding electrostatic latent image.
An electrophotographic apparatus has been developed in which the electrostatic latent image is reversely developed by a magnetic brush developing device and transferred onto a recording medium, and residual toner on the photoreceptor is cleaned by the magnetic brush developing device.
ところが、この種の２回転１コピーの反転現像を行なう
電子−写真装置は、磁気ブラン現像装置の現像ロールに
印加するバイアス電圧の極性をそのままの状態にしてお
くとクリーニング性が悪くなるため、本発明者等は、ク
リーニングプロセス時に現像ロールに印加するバイアス
電圧の極性を反転現像プロセス時の極性とは逆の極性に
切換えることにより、その解決を図ってさた。However, in this type of electrophotographic device that performs two-rotation, one-copy reversal development, cleaning performance deteriorates if the polarity of the bias voltage applied to the developing roll of the magnetic blank developing device remains unchanged. The inventors attempted to solve this problem by switching the polarity of the bias voltage applied to the developing roll during the cleaning process to the opposite polarity to the polarity during the reversal development process.
λ胛だ邂欲」」辷しト（４訓賑バー
ところで、現像バイアス電圧として現像ロールに一定の
極性しか印加していない在米の電子写真装置では、トナ
ー濃度コントロール用として使用されているトナー濃度
検知センサー、すなわち磁気センサーの出力は、第３図
に示す空エーノング（画像をとらずに現像ブラシのみ回
転）における磁気センサー出力から明らかなように、何
等の異常ら見られない。By the way, in electrophotographic equipment in the United States, where only a fixed polarity is applied to the developing roll as a developing bias voltage, the toner used for toner density control is No abnormality was observed in the output of the density detection sensor, that is, the magnetic sensor, as is clear from the magnetic sensor output in the empty mode shown in FIG. 3 (only the developing brush was rotated without taking an image).
しかしながら、前述のようにクリーニングプロセス時に
現像ロールに印加するバイアス電圧の極性を反転現像プ
ロセス時の極性とは逆の極性に切換えることを特徴とす
る上記電子写真装置では、第４図に示すように、例えば
現像バイアス電圧を一３００Ｖに、クリーニングバイア
ス電圧を＋５０■にした場合には、磁気センサー出力の
振れ巾が大きくなり乱れを生じることが判った。However, in the electrophotographic apparatus described above, which is characterized in that the polarity of the bias voltage applied to the developing roll during the cleaning process is switched to the opposite polarity to the polarity during the reversal development process, as shown in FIG. It has been found that, for example, when the developing bias voltage is set to -300 V and the cleaning bias voltage is set to +50 V, the swing range of the magnetic sensor output becomes large and disturbance occurs.
すなわち、この異常は、バイアス電圧を上記のように切
換えた場合（図中のＡの状態）と、バイアス電圧を一定
にした場合（図中のＢの状態）とで比較してみると、第
４図に示すように、バイアス電圧の切換えによる影響が
顕着であることが明確になった。In other words, when comparing the case where the bias voltage is changed as described above (state A in the figure) and the case where the bias voltage is kept constant (state B in the figure), As shown in Figure 4, it became clear that the effect of switching the bias voltage was obvious.
このように、磁気センサー出力の乱れはトナー濃度の安
定に著しい影響を与えるだけでなく、トナー濃度のコン
トロール手段としての磁気センサーの使用についても大
きな問題点となっていた。As described above, disturbances in the output of the magnetic sensor not only significantly affect the stability of toner concentration, but also pose a major problem in the use of the magnetic sensor as a means for controlling toner concentration.
本発明は、上記問題点を解決するためになされたもので
、その目的とするところは、２回転１コピーの反転現像
の電子写真装置に於いても磁気センサーの使用を可能と
し、安定したトナー濃度を得ることのできるトナー）良
度コントロール方法を提供することにある。The present invention has been made in order to solve the above problems, and its purpose is to enable the use of a magnetic sensor even in an electrophotographic device that performs reversal development with two rotations and one copy, and to ensure stable toner production. An object of the present invention is to provide a method for controlling the quality of toner (toner) that can obtain density.
、 σを ゛するためのま嗟
本発明者等は、上記トナー濃度検知センサー、ｒなわち
磁気センサーの出力の乱れの原因をさらに追及するため
に、バイアス電圧を辺換えると共に現像バイアス電圧を
変化させてみたところ、第５図に示すように、帯電され
た感光体の表面電位（−５００〜−５２０Ｖ）と現像プ
ロセス時のバイアス電圧（−２０＜１．−２５０．−３
００．−３５０Ｖ ）の差が大きくなるほど上記磁気セ
ンサー出力の異常が大きくなり、またクリーニングバイ
アス電圧に切換えた場合には異常が全く見られないこと
が確認された。なお、第５図中のＯＮは現像バイアスが
ＯＮ、ＯＦＦは現像バイアスがＯＦＦすなわちクリーニ
ングバイアスがＯＮの状態を示す。In order to further investigate the cause of the disturbance in the output of the toner concentration detection sensor, that is, the magnetic sensor, the inventors changed the bias voltage and the developing bias voltage. As shown in FIG.
00. -350V), the larger the abnormality in the magnetic sensor output becomes, and it was confirmed that no abnormality was observed when switching to the cleaning bias voltage. In FIG. 5, ON indicates that the developing bias is ON, and OFF indicates that the developing bias is OFF, that is, the cleaning bias is ON.
この磁気センサー出力の異常は、現像剤中のキャリアが
感光体表面に引き付けられる力により現像剤の穂立ち状
態が変化し、それを磁気センサーが検知することにより
生ずるものと考えられるが、本発明者等はクリーニング
バイアスに切換えた場合には何等の！４常が見られず、
現像ブコセス時にのみ磁気センサーの５１４常が認めら
れる事実に着目し、この現像プロセス時には磁気センサ
ー出力の検知を行わないことにより、１−記問題点を解
決するに至った。This abnormality in the magnetic sensor output is thought to be caused by the magnetic sensor detecting a change in the standing state of the developer due to the force that attracts carriers in the developer to the surface of the photoreceptor. What happens when people switch to cleaning bias? 4 I can't see anything,
Focusing on the fact that 514 times of the magnetic sensor is observed only during the development process, the problem 1- was solved by not detecting the output of the magnetic sensor during this development process.
即ち、本発明の電子写真装置に於けるトナー濃度コント
ロール方法は、感光体上に光情報を照射して、これに対
応する静電潜像を形成し、該ｅ電層像を磁気ブラシ現像
装置により反転現像して記録体に転写し、上記感光体上
の残留トナーを上記磁気ブラシ装置によりクリーニング
する際、該クリーニングプロセス時に該磁気ブラシ現像
装置の現像ロールに印加するバイアス電圧の極性を上記
反転現像プロセス時とは逆の極性に切換えるようにした
電子写真装置に於いて、上記磁気ブラシ現像装置のトナ
ー濃度を検知する磁気センサーの出力を、上記反転現像
プロセス時にはＯＦＦにすることを特徴とするものであ
る。That is, the toner density control method in an electrophotographic apparatus of the present invention involves irradiating optical information onto a photoreceptor to form a corresponding electrostatic latent image, and transferring the e-electrolayer image to a magnetic brush developing device. When the residual toner on the photosensitive member is cleaned by the magnetic brush device, the polarity of the bias voltage applied to the developing roll of the magnetic brush developing device is reversed as described above. In an electrophotographic apparatus configured to switch to a polarity opposite to that during the development process, the output of a magnetic sensor that detects the toner concentration of the magnetic brush development device is turned off during the reversal development process. It is something.
上記磁気センサーの出力をＯＦＦにするタイミングとし
ては、反転現像プロセス時のバイアス電圧の切換えタイ
ミングに呼応させるのがよく、また、該出力をＯＮにす
るタイミングとしては、クリーニングプロセス時のバイ
アス電圧の切換えタイミングに呼応させるとよい。The timing to turn off the output of the magnetic sensor is preferably in accordance with the switching timing of the bias voltage during the reversal development process, and the timing to turn on the output corresponds to the switching timing of the bias voltage during the cleaning process. It is best to match the timing.
また、上記磁気センサーの出力をＯＦＦ状態にしている
間は、全くトナー補給を行りないか、該磁気センサーの
出力をＯＦＦにする直前の検出値に基づいてトナー補給
を行なうようにする。Further, while the output of the magnetic sensor is turned off, toner is not replenished at all, or toner is replenished based on the detected value immediately before the output of the magnetic sensor is turned off.
χ１鮭
以下、本発明の一寅施例について図面を参照しながら説
明する。χ1 Salmon Hereinafter, one embodiment of the present invention will be described with reference to the drawings.
第１図において、１はドラム状の感光体であって、矢印
方向に２回転して１コピーを行うようになっている。該
感光体１の表面には例えば、酸化亜鉛（ＺｎＯ）や０Ｐ
Ｃ（有機光半導体）等のｐ型やセレンのようなｐ型の光
電導層１ａが形成されている。In FIG. 1, reference numeral 1 denotes a drum-shaped photoreceptor, which rotates twice in the direction of the arrow to make one copy. The surface of the photoreceptor 1 is coated with, for example, zinc oxide (ZnO) or 0P.
A p-type photoconductive layer 1a such as C (organic optical semiconductor) or p-type photoconductive layer 1a such as selenium is formed.
２は磁気ブラシ現像装置であって、現像ロール２ａと、
その周囲に現像剤が穂立状態に付着して形成された磁気
ブラシ２ｂから構成されている。2 is a magnetic brush developing device, which includes a developing roll 2a;
It consists of a magnetic brush 2b formed around which developer is adhered in the form of spikes.
上記現像ロール２ａは、矢印方向に回転する非磁性材ス
リーブと、その中に固定配置された磁石から構成されて
いる。また、上記現像剤は鉄粉等の磁性キャリアとトナ
ーから成り、攪拌羽根３による攪拌摩擦作用により、ト
ナーが摩擦荷電されるようになっている。The developing roll 2a is composed of a non-magnetic material sleeve that rotates in the direction of the arrow, and a magnet fixedly arranged within the sleeve. Further, the developer is composed of a magnetic carrier such as iron powder and toner, and the toner is frictionally charged by the stirring friction action of the stirring blades 3.
４は上記現像剤を収容する現像槽である。Reference numeral 4 denotes a developer tank that accommodates the developer.
５は切換スイッチであって、上記現像ロール２ａのバイ
アス電圧の極性を切換えるようになっている。Reference numeral 5 denotes a changeover switch, which changes the polarity of the bias voltage applied to the developing roll 2a.
６は磁気センサーであって、上記磁気ブラシ２ｂの磁性
キャリア周囲のトナーの量の変化に伴って変動する実効
透磁率を検出して、トナー濃度を検知するようになって
いる。即ち、トナー濃度が大きいと透磁率が小さく、逆
にトナー濃度が小さいと透磁率が大きくなる。Reference numeral 6 denotes a magnetic sensor, which detects toner concentration by detecting effective magnetic permeability that changes with changes in the amount of toner around the magnetic carrier of the magnetic brush 2b. That is, when the toner concentration is high, the magnetic permeability is low, and conversely, when the toner concentration is low, the magnetic permeability is high.
７はトナー補給装置であって、上記磁気センサー６から
の出力に基づいてトナーを上記現像槽４内に補給するよ
うになっている。A toner replenishing device 7 replenishes toner into the developer tank 4 based on the output from the magnetic sensor 6.
次に、上記天施例Ｈｆｆｉの作用について説明する。Next, the operation of the above embodiment Hffi will be explained.
まず、感光体１の表面に正または負のいずれかの電荷を
一様に帯電させる。First, the surface of the photoreceptor 1 is uniformly charged with either positive or negative charges.
続いて、該感光体１の光電導層１ａに文字や図形等の光
情報を照射する。照射光としてコンピューター等からの
レーザ光を使用し、この光情ｔ１部（ｉｉ！ｉｆ像部）
が露光され、光電導層１ａの表面に静電潜像が形成され
る。Subsequently, the photoconductive layer 1a of the photoreceptor 1 is irradiated with optical information such as letters and figures. A laser beam from a computer or the like is used as the irradiation light, and this optical information t1 part (ii!if image part)
is exposed to light, and an electrostatic latent image is formed on the surface of the photoconductive layer 1a.
ＰＩｉＪ２図から明らかなよ５に、画像先端部が磁気ブ
ラシ２ｂの接触領域Ｓに到達する直前に切換スイッチ５
が働いて、現像ロール２ａにバイアス電圧が印加され、
これと同時に磁気センサー６の出力がＯＦＦとなり、ト
ナー補給ｖ装置７に検知されない状態になるゆ
感光体１上の静電潜像部が上記現像ロール２の接触領域
Ｓに到達すると、その非画像部を形成している静電潜像
の電荷と同じ極性に帯電されたトナーが感光体１の画像
部に付着して、いわゆる反転現像が行なわれ、トナーに
よる顕像が形成される。It is clear from Figure PIiJ2 that the changeover switch 5 is activated immediately before the leading edge of the image reaches the contact area S of the magnetic brush 2b.
works, a bias voltage is applied to the developing roll 2a,
At the same time, the output of the magnetic sensor 6 is turned OFF, and the toner replenishment device 7 is unable to detect the electrostatic latent image on the photoreceptor 1. Toner charged to the same polarity as the electrostatic latent image forming the area adheres to the image area of the photoreceptor 1, so-called reversal development is performed, and a toner image is formed.
続いて、上記現像されたトナー像を汁通紙等の記録体に
転写１−る。Subsequently, the developed toner image is transferred onto a recording medium such as a sheet of paper.
転写後の感光体１の表面は、はぼ１周して再び上記現像
ロール２の接触領域Ｓｌ：ｔｌ達し、残留トナーのクリ
ーニングが行なわれる。After the transfer, the surface of the photoreceptor 1 goes around once again and reaches the contact area Sl:tl of the developing roll 2, and the residual toner is cleaned.
このクリーニングプロセス時にも切換スイッチ５が働い
て、上記現像ロール２ａに印加されるバイアス電圧の極
性が上記反転現像プロセス時と逆の極性になるが、その
切換えのタイミングは、第２図から０月らかなよう１こ
、クリーニングプロセスのＩｆ！？始直後に行なわれる
。該クリーニングプロセス時のバイアス電圧の極性の切
換えと同時に磁気センサー６の出力がＯＮとなって、上
記トナー補給Ｖ装置７に検知される。The changeover switch 5 also operates during this cleaning process, and the polarity of the bias voltage applied to the developing roll 2a becomes the opposite polarity to that during the reversal developing process, but the timing of this switching is as follows from FIG. If you like the cleaning process! ? It takes place immediately after the start. Simultaneously with the switching of the polarity of the bias voltage during the cleaning process, the output of the magnetic sensor 6 is turned on and is detected by the toner supply V device 7.
発ｊ ｎ）ｊ−＜７’）芳來
磁気ブラシ現像Ｖ装置のトナー濃度を検知する磁気セン
サーの出力を、上記反転現像プロセス時にはＯＦ Ｆに
することにより、２回転１コピーの反転現像の電子写真
装置に於いても磁気センサーの使用を可能とし、安定し
たトナー濃度を得ることができる。By turning off the output of the magnetic sensor that detects the toner concentration of the magnetic brush development V device during the reversal development process, the electrons of reversal development of 2 rotations and 1 copy can be It also enables the use of magnetic sensors in photographic devices, making it possible to obtain stable toner density.
第１図は本発明方法を実施する電子写真装置の一実施例
の要部説明図、第２図は磁気ブラシ現像装置のバイアス
電圧と磁気センサー出力の切換のタイミング図、第３図
は一定の極性のバイアス電圧時の磁気センサー出力を示
すグラフ、第４図はバイアス電圧の極性を切換えた場合
の磁気センサー出力を示すグラフ、および第５図は現像
バイアス電圧を変えた場合の磁気センサー出力を示すグ
ラフである。
１・・・感光体、１ａ・・・光電導層、２・・・磁気ブ
ラシ現像装置、２ａ・・・現像ロール、２ｂ・・・磁気
ブラシ、３・・・攪拌羽根、４・・・現像槽、５・・・
切換スイッチ、６・・・磁気センサー、７・・・トナー
補給装置、Ｓ・・・接触領域。
特許出願人 株式会社巴川製紙所
同 シャープ 株式会社FIG. 1 is an explanatory diagram of the main parts of an embodiment of an electrophotographic apparatus that implements the method of the present invention, FIG. 2 is a timing diagram of switching between the bias voltage of the magnetic brush developing device and the magnetic sensor output, and FIG. Figure 4 is a graph showing the magnetic sensor output when the polarity of the bias voltage is changed, Figure 4 is a graph showing the magnetic sensor output when the polarity of the bias voltage is changed, and Figure 5 is a graph showing the magnetic sensor output when the developing bias voltage is changed. This is a graph showing. DESCRIPTION OF SYMBOLS 1... Photoreceptor, 1a... Photoconductive layer, 2... Magnetic brush developing device, 2a... Developing roll, 2b... Magnetic brush, 3... Stirring blade, 4... Developing Tank, 5...
Changeover switch, 6... Magnetic sensor, 7... Toner supply device, S... Contact area. Patent applicant: Tomoekawa Paper Mills Co., Ltd. Sharp Co., Ltd.
Claims (5)
電潜像を形成し、該静電潜像を磁気ブラシ現像装置によ
り反転現像して記録体に転写し、上記感光体上の残留ト
ナーを上記磁気ブラシ現像装置によりクリーニングする
際、該クリーニングプロセス時に該磁気ブラシ現像装置
の現像ロールに印加するバイアス電圧の極性を上記反転
現像プロセス時とは逆の極性に切換えるようにした電子
写真装置に於いて、上記磁気ブラシ現像装置のトナー濃
度を検知するトナー濃度検知センサーの出力を、上記反
転現像プロセス時にはＯＦＦにすることを特徴とする電
子写真装置に於けるトナー濃度コントロール方法。(1) Light information is irradiated onto the photoconductor to form a corresponding electrostatic latent image, and the electrostatic latent image is reversely developed using a magnetic brush developing device and transferred to the recording medium. When the residual toner on the magnetic brush is cleaned by the magnetic brush developing device, the polarity of the bias voltage applied to the developing roll of the magnetic brush developing device during the cleaning process is switched to the opposite polarity to that during the reversal developing process. A toner concentration control method in an electrophotographic apparatus, characterized in that an output of a toner concentration detection sensor for detecting the toner concentration of the magnetic brush developing device is turned off during the reversal development process.
ングプロセスから反転現像プロセスに切換えるためのバ
イアス電圧の切換えタイミングに呼応させてＯＦＦにす
ることを特徴とする前記特許請求の範囲第１項に記載の
電子写真装置に於けるトナー濃度コントロール方法。(2) The output of the toner concentration detection sensor is turned off in response to the switching timing of the bias voltage for switching from the cleaning process to the reverse development process. A method of controlling toner density in an electrophotographic device.
プロセスからクリーニングプロセスに切換えるためのバ
イアス電圧の切換えタイミングに呼応させてＯＮにする
ことを特徴とする前記特許請求の範囲第１項または第２
項に記載の電子写真装置に於けるトナー濃度コントロー
ル方法。(3) The output of the toner concentration detection sensor is turned ON in response to the switching timing of the bias voltage for switching from the reversal development process to the cleaning process.
A method for controlling toner density in an electrophotographic apparatus as described in 2.
にしている間は、トナー補給を行わないことを特徴とす
る前記特許請求の範囲第１項、第２項または第３項に記
載の電子写真装置に於けるトナー濃度コントロール方法
。(4) An electronic photograph according to claim 1, 2, or 3, wherein toner is not replenished while the output of the toner concentration detection sensor is in an OFF state. How to control toner density in the device.
、上記トナー濃度検知センサーの出力をＯＦＦにする直
前の検出値に基づいてトナー補給を行なうことを特徴と
する前記特許請求の範囲第１項、第２項または第３項に
記載の電子写真装置に於けるトナー濃度コントロール方
法。(5) While the output of the sensor is in the OFF state, toner is replenished based on the detected value immediately before the output of the toner concentration detection sensor is turned OFF. 3. A method for controlling toner density in an electrophotographic apparatus according to item 2, item 3, or item 3.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP18262586A JPS6338967A (en) | 1986-08-05 | 1986-08-05 | Toner concentration control method in electrophotographic device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP18262586A JPS6338967A (en) | 1986-08-05 | 1986-08-05 | Toner concentration control method in electrophotographic device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6338967A true JPS6338967A (en) | 1988-02-19 |
| JPH0529113B2 JPH0529113B2 (en) | 1993-04-28 |
Family
ID=16121560
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP18262586A Granted JPS6338967A (en) | 1986-08-05 | 1986-08-05 | Toner concentration control method in electrophotographic device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6338967A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01138584A (en) * | 1987-11-26 | 1989-05-31 | Mita Ind Co Ltd | Toner density controller |
-
1986
- 1986-08-05 JP JP18262586A patent/JPS6338967A/en active Granted
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01138584A (en) * | 1987-11-26 | 1989-05-31 | Mita Ind Co Ltd | Toner density controller |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0529113B2 (en) | 1993-04-28 |
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