JPS6080879A - Detection of developer density - Google Patents

Detection of developer density

Info

Publication number
JPS6080879A
JPS6080879A JP18771383A JP18771383A JPS6080879A JP S6080879 A JPS6080879 A JP S6080879A JP 18771383 A JP18771383 A JP 18771383A JP 18771383 A JP18771383 A JP 18771383A JP S6080879 A JPS6080879 A JP S6080879A
Authority
JP
Japan
Prior art keywords
window
developer
developing device
light
detection
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
JP18771383A
Other languages
Japanese (ja)
Inventor
Shigeru Nakayama
茂 中山
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.)
Olympus Corp
Original Assignee
Olympus Corp
Olympus Optical 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 Olympus Corp, Olympus Optical Co Ltd filed Critical Olympus Corp
Priority to JP18771383A priority Critical patent/JPS6080879A/en
Publication of JPS6080879A publication Critical patent/JPS6080879A/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
    • G03G15/0855—Detection or control means for the developer concentration the concentration being measured by optical means
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G2215/00—Apparatus for electrophotographic processes
    • G03G2215/08—Details of powder developing device not concerning the development directly
    • G03G2215/0888—Arrangements for detecting toner level or concentration in the developing device
    • G03G2215/0891—Optical detection
    • G03G2215/0894—Optical detection through a light transmissive window in the developer container wall
    • G03G2215/0897—Cleaning of the light transmissive window

Abstract

PURPOSE:To prevent deterioration in the accuracy of detecting developer density owing to a stained light transmittable window for detecting toner density provided in the outside wall part of a developing device by cleaning periodically said window by a magnetic brush which rotates together with agitating vanes. CONSTITUTION:A light transmittable window 30 is provided in the position in a developing device 24 where the developer agitated by agitating vanes 27 is visible well. A photoelectric detector 33 is disposed on the outside flank thereof. Light is irradiated from a light source 31 of the detector 33 through the window 30 to the developer in the developing device during the operation of the developing device and the light reflected from the developer is detected by a photodetector 32 by which the toner density is detected. A magnet 34 is provided in a part at the top end of the vanes 27 and a magnetic brush 35 formed by said magnet rubs periodically the window 30 according to the rotation of the vanes 27. Since the window 30 is cleaned in such a way, the window is not stained by the toner and the toner density is detected with high accuracy.

Description

【発明の詳細な説明】 〔技術分野〕 この発明は、複写機等の電子写真装置における磁性キャ
リア使用の二成分現像剤のトチ−濃度を光電的に検出す
る現像剤濃度検出方法に関する。DETAILED DESCRIPTION OF THE INVENTION [Technical Field] The present invention relates to a developer concentration detection method for photoelectrically detecting the toe density of a two-component developer using a magnetic carrier in an electrophotographic apparatus such as a copying machine.

〔従来技術〕[Prior art]

従来、二成分現像剤のトナー濃度を光電的に検知する手
段としては、第１図に示すように、現像装置１の任意の
場所、例えば、・・ウジング２の一部に検出窓３を設け
、該検出窓３の外側に配置した光源４から、現像装置１
内で撹拌羽根６で撹拌されている現像剤に光を照射して
、トナー濃度の変化に基づく現像剤の反射率の変化を、
同じく検出窓２の外側に配置した受光素子５で検知し、
トナー濃度を検出する方法が知られている。Conventionally, as a means for photoelectrically detecting the toner concentration of a two-component developer, as shown in FIG. , the developing device 1 from the light source 4 arranged outside the detection window 3.
Light is irradiated onto the developer that is being stirred by the stirring blade 6 inside, and changes in the reflectance of the developer based on changes in toner concentration are detected.
Detected by the light receiving element 5 similarly placed outside the detection window 2,
Methods of detecting toner concentration are known.

しかし、この方法を用いた濃度検出装置においては、検
出窓が現像剤で汚れ易く、１だ、検出窓を介さず、光源
から直接現像剤に光を照射し、受光素子で直接反射光を
検知する場合には、光源や受光素子が汚染されやすく、
それにより検知出力が変化してしまい、実用化は困難で
あった。However, in the density detection device using this method, the detection window is easily contaminated with developer. When using
This changes the detection output, making it difficult to put it into practical use.

そこで、この点を改善するために、第２図に示すように
、現像装置１における、マグネットローラー７と非磁性
スリーブ８とからなる現像ローラ−９の、該スリーブ８
上の現像剤搬送穂立部１０の位置に対応する現像装置の
壁部に、検出窓１１を設けて、光源１２と受光素子１３
からなる検知器を配置し、該検出窓１１に穂立てを当て
て清掃しながら、現像剤の反射率の変化を検知器で検出
する方法が提案されている。この方法を用いた場合は、
検出窓１１の汚れはなくなシ、したがって、清掃等のメ
ンテナンスの必要性が少くなシ、この点では極めて優れ
ているが、現像剤の穂立部における現像剤の反射率を測
定しているので、現像剤が平坦状で搬送されている非穂
立部と比べ、検知出力が非常に小さく、ノイズが入シや
すい。したがって、検知信号処理が非常に行ないにくり
、環境条件の影響を受けやすい等の欠点がある。Therefore, in order to improve this point, as shown in FIG.
A detection window 11 is provided on the wall of the developing device corresponding to the position of the upper developer conveying bristles 10, and a detection window 11 is provided in the wall of the developing device corresponding to the position of the upper developer conveying ear stand 10.
A method has been proposed in which a detector consisting of the following is arranged, and a change in the reflectance of the developer is detected by the detector while the detection window 11 is being cleaned by applying a brush holder to the detection window 11. If you use this method,
There is no dirt on the detection window 11, so there is less need for maintenance such as cleaning.Although this method is extremely superior in this respect, it measures the reflectance of the developer at the ridges of the developer. Therefore, the detection output is very small compared to the non-spill portion where the developer is conveyed in a flat state, and noise is easily generated. Therefore, detection signal processing is very difficult, and there are drawbacks such as being susceptible to environmental conditions.

〔目　的〕〔the purpose〕

本発明は、上記従来の現像剤濃度検出方法の欠点を解消
すべくなされたもので、光電検知器や検出窓が現像剤で
汚染されず、且つ検知出力が大きくとれて、ノイズ等の
環境条件の影響を受けない安定した濃度検出方法を提供
することを目的とす〔概　要〕 本発明は、現像装置の撹拌羽根の一部にマグネットを設
けて磁気ブラシを形成させ、撹拌羽根の回転に伴って該
磁気ブラ／を、現像装置の壁部に設けた現像剤濃度検出
用透光性窓に、周期的に摺擦させて清掃し、透光性窓の
外側に設けた光電検知器により、この透光性窓を通して
、磁気ブラシ部が透光性窓に摺擦しない時点における現
像剤の光学的反射濃度を検出するようにして、犬なる濃
度検知出力を安定して得られるようにするものである。The present invention was made in order to eliminate the drawbacks of the conventional developer concentration detection method described above, and it is possible to prevent the photoelectric detector and the detection window from being contaminated with developer, to obtain a large detection output, and to eliminate environmental conditions such as noise. The purpose of the present invention is to provide a stable concentration detection method that is not affected by the At the same time, the magnetic bra is periodically rubbed and cleaned against a transparent window for detecting developer concentration provided on the wall of the developing device, and a photoelectric detector provided on the outside of the transparent window is used to clean the magnetic bra. Through this light-transmitting window, the optical reflection density of the developer is detected at the time when the magnetic brush section does not rub against the light-transmitting window, thereby stably obtaining a density detection output. It is something.

〔実施例〕〔Example〕

以下本発明の実施例について説明する。第３図は、本発
明の一実施例を適用した電子写真装置の現像装置部分の
一構成例を示す図である。図において、２１１ｄ固定さ
れたマグネットロール２２上にアルミニウム等からなる
非磁性スリーブ２３を被せて形成した現像ローラーで、
該スリーブ２３を回転させて現像装置２４の内部に収容
されているｇｌ、浄剤を搬送して、感光体ドラム５と対
向するマグネットロール２２の磁極２２′の位置で、磁
気ブラシを形成して、感光体ドラム２５に形成されてい
る静電潜像を現像するものである。２６は現像ローラー
２１のスリーブ２３上から現像剤をかき落すスクレーパ
ー、２７は現像装置２４の内部に収容されている現Ｓ＃
拌羽根、公は現像装置２４の上部に形成した、トナー補
給ローラー２９を配置したトナーホッパーである。側は
現像装置２４の側壁部Ｕ′の一部の、撹拌羽根２７によ
り撹拌された現像剤が良く見える位置に設けた検出用透
光性窓で、この窓の外側方には、ＬＥＤ、タングステン
ラ／ブ等からなる光源３１と、ホトトランジスタ、ダイ
オード等からなる受光素子３２とで構成されている光電
検知器３３を配置している。３／Ｉは前記透光性窓３０
に撹拌羽根２７０回転によシ周期的に対向するように、
撹拌羽根２７の先端に設けたマグオツドである。Examples of the present invention will be described below. FIG. 3 is a diagram showing an example of the configuration of a developing device portion of an electrophotographic apparatus to which an embodiment of the present invention is applied. In the figure, 211d is a developing roller formed by covering a fixed magnet roll 22 with a non-magnetic sleeve 23 made of aluminum or the like.
The sleeve 23 is rotated to convey the glazing agent and cleaning agent contained in the developing device 24, and a magnetic brush is formed at the position of the magnetic pole 22' of the magnet roll 22 facing the photosensitive drum 5. , which develops the electrostatic latent image formed on the photoreceptor drum 25. 26 is a scraper that scrapes off the developer from the sleeve 23 of the developing roller 21; 27 is a developer S# accommodated inside the developing device 24;
The stirring blade is a toner hopper formed above the developing device 24 and in which a toner supply roller 29 is arranged. On the side is a light-transmitting window for detection provided in a part of the side wall U' of the developing device 24 at a position where the developer stirred by the stirring blade 27 can be clearly seen. A photoelectric detector 33 is arranged, which is composed of a light source 31 made of a phototransistor, a diode, etc., and a light receiving element 32 made of a phototransistor, a diode, etc. 3/I is the translucent window 30
The stirring blades rotate at 270 revolutions and periodically face each other.
This is a magnet provided at the tip of the stirring blade 27.

このように構成した現像装置においては、現像装置の作
動中、光電検知器３３の光源３１から透光性窓３０を介
して、現像装置内の現像剤に光を照射１−１その反射光
を受光素子３２で検知して現像剤のトナー濃度を検出し
、この検出濃度を比較回路で基準レベルと比較して、基
準レベルよりトナー濃度が低い場合には、トナー補給ロ
ーラー２９を回転し、トナーホッパー２８から現像装置
内へトナーを補給するものである。In the developing device configured as described above, during operation of the developing device, light is irradiated from the light source 31 of the photoelectric detector 33 to the developer in the developing device through the transparent window 30. The light receiving element 32 detects the toner density of the developer, and the comparison circuit compares the detected density with a reference level. If the toner density is lower than the reference level, the toner supply roller 29 is rotated to remove the toner. Toner is supplied from the hopper 28 into the developing device.

このようにして現像剤濃度の制御が行われる場合、一般
には、透光性窓Ｉは現像剤により非常に汚れやすく、そ
の結果、検知精度が低下し定期的にクリーニングしなけ
ればならないものであるが、本発明においては、撹拌羽
根２７の先端の一部にマグネット３４が設けられている
ので、このマグネット３４により磁気ブラシ３５が形成
されており、この磁気ブラシ３５は撹拌羽根２７の回転
により周期的に透光性窓３０を摺擦してクリ一二ノグす
る。したがって、透光性窓刃はトナーで汚染されること
はなく、高精度でトナー濃度を検出することができる。When the developer concentration is controlled in this way, the light-transmitting window I is generally very easily contaminated by the developer, resulting in a decrease in detection accuracy and the need for periodic cleaning. However, in the present invention, since a magnet 34 is provided at a part of the tip of the stirring blade 27, this magnet 34 forms a magnetic brush 35, and this magnetic brush 35 is rotated periodically by the rotation of the stirring blade 27. Scrub the translucent window 30 and clean it. Therefore, the transparent window blade is not contaminated with toner, and the toner concentration can be detected with high accuracy.

なお、光電検知器３３によるトナー濃度の検知は、その
検知出力を犬にするだめ、磁気ブラ・／３５による周期
的な清掃の間において行われるように構成されている。Note that the detection of the toner concentration by the photoelectric detector 33 is configured to be carried out during periodic cleaning by the magnetic bra /35 in order to reduce the detection output to a dog.

撹拌羽根２７に設けられるマグネット３４は、第４図に
示すように、透光性窓３０の中央部に最も近ずく位置で
、そのＮ、Ｓ極の方向が透光性窓３０に対して、はぼ直
角になるように、すなわち撹拌羽根２７の径方向に配設
されるか、最も効果的である。As shown in FIG. 4, the magnet 34 provided on the stirring blade 27 is located closest to the center of the translucent window 30, and its N and S poles are aligned with respect to the translucent window 30. It is most effective to arrange the stirring blades 27 at right angles, that is, in the radial direction of the stirring blades 27.

なお、ＮとＳの極性は図示のものと逆の配置にしてもよ
い。Note that the polarities of N and S may be arranged opposite to those shown in the drawings.

また、光電検知器３３を構成する光源３１と受光素子３
２は、第４図に示すようなブロック３３′内に埋め込む
ように配設されていると使い易く好適なものである。In addition, a light source 31 and a light receiving element 3 that constitute a photoelectric detector 33 are also included.
2 is preferably disposed so as to be embedded in a block 33' as shown in FIG. 4 for ease of use.

透光性窓３０は、第５図に示すように、現像装置２４の
下面壁部２４″に配置し、あるいは、第６図に示すよう
に、現像装置２４の側壁部２４′と下面壁部２４″との
角部に配置して、それに対向して光電検知器３３を設け
、トナー濃度を検出する場合も、同様に高精度で安定し
てトナー濃度を検出することができる。The light-transmitting window 30 is disposed on the lower wall 24'' of the developing device 24, as shown in FIG. 5, or on the side wall 24' and the lower wall of the developing device 24, as shown in FIG. 24'' and a photoelectric detector 33 is provided opposite thereto to detect the toner concentration, the toner concentration can be similarly detected stably with high accuracy.

第７図に示す構成例は、マグネット３４を、第３図に示
した構成例の如く、撹拌羽根２７の羽根の先端部に設け
ずに、羽根間に該撹拌羽根２７と共に回転するように配
置した例で、このようにマグネット３４を配置しても、
このマグネットにより形成される磁気プラノにより、透
光性窓３０は撹拌羽根２７の回転によって、周期的にク
リーニングされる。In the configuration example shown in FIG. 7, the magnet 34 is not provided at the tip of the stirring blade 27 as in the configuration example shown in FIG. 3, but is arranged between the blades so as to rotate together with the stirring blade 27. In the example above, even if the magnet 34 is arranged like this,
The translucent window 30 is periodically cleaned by the rotation of the stirring blade 27 by the magnetic plano formed by this magnet.

第８図は、他の構成例を示すもので、同図に示すよう、
透光性窓３０の中央部が、撹拌羽根２７が現像装置の側
壁２４′に対して最も接近した位置にくるよう配置され
ていない場合には、マグネット３４は、同図に示すよう
に、撹拌羽根２７の径方向に沿って配置せず、透光性窓
３０の中央部に対して直角方向に向くように配設される
。FIG. 8 shows another configuration example, and as shown in the figure,
If the central part of the light-transmitting window 30 is not arranged so that the stirring blade 27 is closest to the side wall 24' of the developing device, the magnet 34 does not move the stirring blade 27 as shown in the figure. They are not arranged along the radial direction of the blades 27, but are arranged so as to face perpendicularly to the center of the translucent window 30.

第９図は、更に他の構成例を示すものである。FIG. 9 shows yet another configuration example.

上記第３図〜第８図に示した構成例では、光電検知器３
３の光源３１と受光素子３２の各光軸方向と透光性窓と
のなす角度が等しくなるように、光源３１と受光素子３
２とを配置したものを示したが、第９図に示すように、
光源３１の光軸が透光性窓に対して直交するように配置
してもよいし、寸だ、逆に受光素子３２の光軸を透光性
窓に対して直交するように配置してもよい。In the configuration example shown in FIGS. 3 to 8 above, the photoelectric detector 3
The light source 31 and the light receiving element 3 are arranged so that the angles between the optical axis directions of the light source 31 and the light receiving element 32 of No. 3 and the translucent window are equal.
2 is shown, but as shown in Figure 9,
The optical axis of the light source 31 may be arranged to be orthogonal to the translucent window, or conversely, the optical axis of the light receiving element 32 may be arranged to be orthogonal to the translucent window. Good too.

上記各構成例において、撹拌羽根に配設するマグネット
を電磁石で構成し、少くとも透光性窓と対向する時点で
該電磁石に通電して磁気ブラ／を形成し、透光性窓をク
リーニングするように構成することもできる。また、撹
拌羽根に取付けるマグネットは、−個に限らず複数個に
してもよい。In each of the above configuration examples, the magnet disposed on the stirring blade is an electromagnet, and the electromagnet is energized at least at the point where it faces the translucent window to form a magnetic bra, thereby cleaning the translucent window. It can also be configured as follows. Further, the number of magnets attached to the stirring blade is not limited to -, but may be a plurality.

また、以上の各構成例では、透光性窓を撹拌羽根と共に
回転する磁気ブラシによシ周期的に清掃するものを示し
たが、透光性窓の少くとも現像剤と接する側に、例えば
、ネザガラスのような透光性の導電層を施してバイアス
を印加することにょシ、透光性窓を更に汚れにくくする
ことができるこの際印加するバイアス電圧ｖｂは、例え
ば負極性のトナーを用いていて、現像スリーブに正の現
像バイアス電圧ＶＤが印加されている場合には、ＶＤ＞
ｖｂ≧０、又は、ｖｂ＜ｏにすればよい。Furthermore, in each of the above configuration examples, the light-transmitting window is periodically cleaned by a magnetic brush that rotates together with the stirring blade, but at least the side of the light-transmitting window in contact with the developer, for example, By applying a bias by applying a light-transmitting conductive layer such as nether glass, the light-transmitting window can be made more difficult to stain. and a positive developing bias voltage VD is applied to the developing sleeve, VD>
It is sufficient if vb≧0 or vb<o.

〔効　果〕〔effect〕

以上詳細に説明したように、本発明は、現像装置の外壁
部に設けたトナー濃度検出用の透光性窓を、撹拌羽根と
共に回転する磁気ブラシにより周期的に清掃するように
したので、透光性窓の汚染による現像剤濃度の検出精度
低下を防止することができる。また、現像剤濃度検出は
透光性窓を磁気ブラシで摺擦していない時点で行うので
、検知出力が大きくとれて、後の信号処理を容易に行う
ことができる。As explained in detail above, the present invention has a structure in which the transparent window for toner concentration detection provided on the outer wall of the developing device is periodically cleaned by a magnetic brush that rotates together with the stirring blade. It is possible to prevent a decrease in the detection accuracy of developer concentration due to contamination of the optical window. Further, since the developer concentration is detected at a time when the light-transmitting window is not being rubbed with the magnetic brush, a large detection output can be obtained, and subsequent signal processing can be easily performed.

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

第１図及び第２図は、従来の現像剤濃度検出装置の構成
例を示す概路線図、第３図は、本発明の現像剤濃度検出
方法を実施するだめの検出装置の一構成例を示す概路線
図、第４図は、第３図に示した装置の拡大部分図、第５
図乃至第９図は、それぞれ、本発明を実施するだめの検
出装置の他の構成例を示す概路線図である。 図において、２１は現像ローラー、２２はマグネットロ
ール、２３は非磁性スリーブ、２４は現像装置、２５は
感光体ドラム、２６はスクレーパー、２７は撹拌羽根、
２８はトナーホンバー、２９はトナー補給ローラー、３
０は検出用透光性窓、３３は光電検知器、３４はマグネ
ット、３５は磁気ブラシを示す。 特許出願人　オリンパス光学工業株式会社第　１　区 荊２図 東３図 ／４ 荊５ス ハＡ ゛末６図 方７図 寮　８図 ７ 第９図1 and 2 are schematic diagrams showing an example of the configuration of a conventional developer concentration detection device, and FIG. 3 is a schematic diagram showing an example of the configuration of a detection device for implementing the developer concentration detection method of the present invention. The schematic route map shown in Figure 4 is an enlarged partial view of the equipment shown in Figure 3, Figure 5.
9 to 9 are schematic diagrams showing other configuration examples of a detection device for carrying out the present invention. In the figure, 21 is a developing roller, 22 is a magnet roll, 23 is a non-magnetic sleeve, 24 is a developing device, 25 is a photosensitive drum, 26 is a scraper, 27 is a stirring blade,
28 is a toner horn bar, 29 is a toner supply roller, 3
0 is a light-transmitting window for detection, 33 is a photoelectric detector, 34 is a magnet, and 35 is a magnetic brush. Patent Applicant: Olympus Optical Industry Co., Ltd. District 1, Figure 2, Figure East 3/4, Figure 5, Sha A, Figure 6, Figure 7, Dormitory, Figure 8, Figure 7, Figure 9.

Claims (1)

【特許請求の範囲】[Claims] 現像ローラーと撹拌羽根とを備え磁性キャリア使用の二
成分現像剤を収容した現像装置の外壁部に、透光性窓を
配置し、該窓の外側部に現像剤の濃度を検知する光電検
知器を設けた電子写真装置の現像剤濃度検出装置におい
て、前記撹拌羽根の一部にマグネットを設けて磁気プラ
ンを形成し、該磁気ブラシを前記透光性窓に周期的に摺
擦させてクリーニングし、クリーニングされた該窓を通
して、該窓に磁気ブラシが摺擦していない時点に、光電
検知器により現像剤の濃度を検出するようにしたことを
特徴とする現像剤濃度検出方法。A light-transmitting window is arranged on the outer wall of a developing device that includes a developing roller and a stirring blade and contains a two-component developer using a magnetic carrier, and a photoelectric detector that detects the concentration of the developer is placed outside the window. In the developer concentration detection device for an electrophotographic apparatus, a magnet is provided in a part of the stirring blade to form a magnetic plan, and the magnetic brush is periodically rubbed against the transparent window for cleaning. A method for detecting developer concentration, characterized in that the concentration of the developer is detected by a photoelectric detector through the cleaned window at a time when the magnetic brush is not rubbing against the window.
JP18771383A 1983-10-08 1983-10-08 Detection of developer density Pending JPS6080879A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP18771383A JPS6080879A (en) 1983-10-08 1983-10-08 Detection of developer density

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP18771383A JPS6080879A (en) 1983-10-08 1983-10-08 Detection of developer density

Publications (1)

Publication Number Publication Date
JPS6080879A true JPS6080879A (en) 1985-05-08

Family

ID=16210865

Family Applications (1)

Application Number Title Priority Date Filing Date
JP18771383A Pending JPS6080879A (en) 1983-10-08 1983-10-08 Detection of developer density

Country Status (1)

Country Link
JP (1) JPS6080879A (en)

Cited By (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61204656A (en) * 1985-03-07 1986-09-10 Toshiba Corp Developing device
JPS6388577A (en) * 1986-10-02 1988-04-19 Canon Inc Developing device
JPS63106679A (en) * 1986-10-23 1988-05-11 Minolta Camera Co Ltd Developing device
US4998141A (en) * 1990-08-31 1991-03-05 Eastman Kodak Company Electret toner concentration monitor
US5017966A (en) * 1988-10-31 1991-05-21 Kabushiki Kaisha Toshiba Toner cartridge and image forming apparatus having the toner cartridge
US5036358A (en) * 1989-02-10 1991-07-30 Minolta Camera Kabushiki Kaisha Image-forming apparatus and a method for a detecting developer amount therein
US5117259A (en) * 1990-05-15 1992-05-26 Minolta Camera Kabushiki Kaisha Apparatus for measuring developer density
EP0526194A2 (en) * 1991-07-30 1993-02-03 Xerox Corporation Toner concentration sensing using auger mounted magnet
US5276481A (en) * 1991-05-14 1994-01-04 Minolta Camera Kabushiki Kaisha Method and apparatus for optically measuring toner density
US5383007A (en) * 1991-05-14 1995-01-17 Minolta Camera Kabushiki Kaisha Apparatus for measuring developer density by reflected light from the developer illuminated through a detection window
US5398106A (en) * 1992-01-21 1995-03-14 Minolta Camera Kabushiki Kaisha Image forming apparatus utilizing replaceable image forming cartridge and detecting means
EP1681602A1 (en) * 2004-12-14 2006-07-19 Xerox Corporation Optical sensor in a developer apparatus for measurement of toner concentration
JP2006220889A (en) * 2005-02-10 2006-08-24 Seiko Epson Corp Liquid toner concentration detecting device, image forming apparatus using the same and concentration control method
JP2006251130A (en) * 2005-03-09 2006-09-21 Seiko Epson Corp Liquid toner concentration detecting device, image forming apparatus using the same and concentration control method
US7444093B2 (en) * 2005-02-10 2008-10-28 Seiko Epson Corporation Liquid toner concentration detecting device and method with window in toner container for light passage

Cited By (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61204656A (en) * 1985-03-07 1986-09-10 Toshiba Corp Developing device
JPS6388577A (en) * 1986-10-02 1988-04-19 Canon Inc Developing device
JPS63106679A (en) * 1986-10-23 1988-05-11 Minolta Camera Co Ltd Developing device
US5017966A (en) * 1988-10-31 1991-05-21 Kabushiki Kaisha Toshiba Toner cartridge and image forming apparatus having the toner cartridge
US5036358A (en) * 1989-02-10 1991-07-30 Minolta Camera Kabushiki Kaisha Image-forming apparatus and a method for a detecting developer amount therein
US5117259A (en) * 1990-05-15 1992-05-26 Minolta Camera Kabushiki Kaisha Apparatus for measuring developer density
US4998141A (en) * 1990-08-31 1991-03-05 Eastman Kodak Company Electret toner concentration monitor
US5276481A (en) * 1991-05-14 1994-01-04 Minolta Camera Kabushiki Kaisha Method and apparatus for optically measuring toner density
US5383007A (en) * 1991-05-14 1995-01-17 Minolta Camera Kabushiki Kaisha Apparatus for measuring developer density by reflected light from the developer illuminated through a detection window
EP0526194A2 (en) * 1991-07-30 1993-02-03 Xerox Corporation Toner concentration sensing using auger mounted magnet
EP0526194A3 (en) * 1991-07-30 1994-03-16 Xerox Corp
US5398106A (en) * 1992-01-21 1995-03-14 Minolta Camera Kabushiki Kaisha Image forming apparatus utilizing replaceable image forming cartridge and detecting means
EP1681602A1 (en) * 2004-12-14 2006-07-19 Xerox Corporation Optical sensor in a developer apparatus for measurement of toner concentration
JP2006220889A (en) * 2005-02-10 2006-08-24 Seiko Epson Corp Liquid toner concentration detecting device, image forming apparatus using the same and concentration control method
US7444093B2 (en) * 2005-02-10 2008-10-28 Seiko Epson Corporation Liquid toner concentration detecting device and method with window in toner container for light passage
US7729627B2 (en) 2005-02-10 2010-06-01 Seiko Epson Corporation Image forming apparatus that detects concentration of liquid toner using light reflected through liquid toner
JP2006251130A (en) * 2005-03-09 2006-09-21 Seiko Epson Corp Liquid toner concentration detecting device, image forming apparatus using the same and concentration control method

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