JP2002351129A - Toner and image forming device - Google Patents
Toner and image forming deviceInfo
- Publication number
- JP2002351129A JP2002351129A JP2001154264A JP2001154264A JP2002351129A JP 2002351129 A JP2002351129 A JP 2002351129A JP 2001154264 A JP2001154264 A JP 2001154264A JP 2001154264 A JP2001154264 A JP 2001154264A JP 2002351129 A JP2002351129 A JP 2002351129A
- Authority
- JP
- Japan
- Prior art keywords
- toner
- external additive
- image carrier
- amount
- image forming
- 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
Landscapes
- Color Electrophotography (AREA)
- Developing Agents For Electrophotography (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は感光体や中間転写体
からの剥離性を改善したトナーおよび画像形成装置に関
する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a toner and an image forming apparatus having improved releasability from a photosensitive member or an intermediate transfer member.
【０００２】[0002]
【従来の技術】画像形成装置におけるトナーは、図６に
示すように、現像装置内において供給ローラ２０から現
像ローラ２１に供給され、この時供給ローラにより擦り
つけられて摩擦帯電し、分子間力と鏡像力とで現像ロー
ラに引きつけられて付着しており、規制ブレード２２で
厚みが規制されると共にさらに帯電が付与され、感光体
との接触部において現像電界によるクーロン力で現像ロ
ーラから引き剥がされて感光体上に付着して静電潜像を
現像する。2. Description of the Related Art As shown in FIG. 6, a toner in an image forming apparatus is supplied from a supply roller 20 to a developing roller 21 in a developing apparatus. And the mirror image force attracts and adheres to the developing roller, and the thickness is regulated by the regulating blade 22 and further charged, and is peeled off from the developing roller by the Coulomb force due to the developing electric field at the contact portion with the photoconductor. Then, the electrostatic latent image is developed on the photoreceptor and developed.
【０００３】このように、トナーは現像ローラに付着し
て供給ローラや規制ブレードとの間をすりぬけて感光体
まで搬送される必要があり、良好な流動性と帯電性が求
められる。そのために従来のトナーは、図７に示すよう
に、樹脂からなるトナー母剤の表面にシリカ（Ｓｉ
Ｏ2 ）等からなる外添剤を付着させ、その流動性および
帯電性を得るようにしている。As described above, the toner needs to adhere to the developing roller and pass through the gap between the supply roller and the regulating blade and be conveyed to the photoreceptor, so that good fluidity and chargeability are required. For this reason, as shown in FIG. 7, a conventional toner has a silica (Si)
An external additive such as O 2 ) is attached to obtain the fluidity and chargeability.
【０００４】[0004]
【発明が解決しようとする課題】画像形成装置に用いる
トナーは流動性、帯電性を良好にすることが求められる
が、カラー画像形成装置においては、例えば感光体から
一色ずつ４色のトナーが中間転写体上に定着されて色重
ねされ、これを一括して用紙上に転写することが行われ
ている。４色のトナーはそれぞれ性質が異なり、しかも
４色色重ねして中間転写体から用紙上に一括転写する際
に、綺麗に剥離する必要がある。このようなトナーの剥
離性には、外添剤の役割が大きいことは分かっている
が、４色色重ねされた時に各色トナーの剥離性がどのよ
うな関係にあるべきかについては、十分な検討がなされ
ていない。The toner used in an image forming apparatus is required to have good fluidity and chargeability. In a color image forming apparatus, for example, four color toners of a single color are interposed from a photosensitive member. A color is superimposed on a transfer body and is then superimposed, and this is collectively transferred onto a sheet. The properties of the four color toners are different from each other, and when the four color toners are superimposed and collectively transferred from the intermediate transfer member onto the sheet, it is necessary to peel off the fine colors. It is known that the role of the external additive plays a large role in such toner releasability. However, when the four colors are superimposed, the relationship between the releasability of each color toner should be sufficiently examined. Has not been made.
【０００５】[0005]
【課題を解決するための手段】本発明は上記課題を解決
するためのもので、像担持体上に色重ねされた複数色の
トナーについて像担持体と直接接触する最下層のトナー
の外添剤の遊離率、あるいは同期トナーの量を他層のト
ナーよりも大きくして剥離性を良好にしたものである。SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and it is an object of the present invention to provide a method for externally adding toner of a lowermost layer which is in direct contact with an image carrier for a plurality of color toners superimposed on the image carrier. The release rate of the agent or the amount of the synchronous toner is made larger than that of the toner of the other layer to improve the releasability.
【０００６】そのために請求項１の発明は、カラー画像
形成装置に用いるトナーにおいて、像担持体と直接接触
するトナーは、他の色のトナーより外添剤被覆率が大き
いか、或いは遊離外添剤の量が多いことを特徴とする。
請求項２の発明は、像担持体と直接接触するトナーの添
加剤遊離率が１〜１０％であることを特徴とする。請求
項３の発明は、像担持体と直接接触するトナーの母材等
価粒径と外添剤等価粒径の同期分布曲線の傾きが０．６
〜１．０であることを特徴とする。請求項４の発明は、
静電潜像が形成される潜像担持体と、潜像担持体上の静
電潜像をトナー現像する現像手段と、潜像担持体のトナ
ー画像を転写する転写手段とを備え、前記トナーは請求
項１乃至３いずれか記載のトナーであることを特徴とす
る。[0006] Therefore, the present invention is directed to a toner for use in a color image forming apparatus, wherein the toner which is in direct contact with the image carrier has a higher external additive coverage than other color toners or a free external additive. It is characterized by a large amount of the agent.
The invention according to claim 2 is characterized in that the toner which comes into direct contact with the image carrier has an additive release rate of 1 to 10%. According to a third aspect of the present invention, the slope of the synchronous distribution curve between the base material equivalent particle diameter and the external additive equivalent particle diameter of the toner that comes into direct contact with the image carrier is 0.6.
１．０1.0. The invention of claim 4 is
A latent image carrier on which an electrostatic latent image is formed, developing means for developing the electrostatic latent image on the latent image carrier with toner, and transfer means for transferring a toner image on the latent image carrier; Is a toner according to any one of claims 1 to 3.
【０００７】[0007]
【発明の実施の形態】以下、本発明の実施の形態を図面
を参照しつつ説明する。図１は本発明の画像形成装置に
用いるトナーを説明する図である。図において、像担持
体１（感光体、或いは中間転写体）上に１色目トナー
２、２色目トナー３、３色目トナー４、４色目トナー５
が色重ねされて付着している様子が模式的に示されてい
る。各トナーには、外添剤が被覆されているが、本発明
においては、像担持体に直接接触する最下層である１色
目トナー２の遊離外添剤６を２〜４色目のトナーの遊離
外添剤の量よりも多くする。遊離外添剤６はトナーと像
担持体との間にあって、一種のコロのような役割を果た
すため、転写電界が加えられた時に像担持体１からの剥
離性を良好にし、転写が良好に行えるように作用する。Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a diagram illustrating a toner used in the image forming apparatus of the present invention. In the figure, a first-color toner 2, a second-color toner 3, a third-color toner 4, and a fourth-color toner 5 are placed on an image carrier 1 (a photoconductor or an intermediate transfer body).
Are schematically shown in a superimposed color. Each toner is coated with an external additive, but in the present invention, the free external additive 6 of the first color toner 2 which is the lowermost layer which is in direct contact with the image carrier is replaced with the free external toner 6 of the second to fourth colors. Make it larger than the amount of external additives. Since the free external additive 6 is located between the toner and the image carrier and plays a role of a kind of roller, the exfoliation property from the image carrier 1 is improved when a transfer electric field is applied, and the transfer is improved. It works to be able to do it.
【０００８】図２に示すように、トナーが負帯電の時
に、絶縁体からなる遊離外添剤も負に帯電し、現像電界
によりトナーと一緒に、あるいはトナーとトナーの間に
紛れて運ばれて像担持体に付着する。通常、トナーには
定着性を良好にするためにワックスが添加されており、
そのため付着性が生じてトナー母剤が直接像担持体に接
触すると剥離性が低下する。従って、遊離外添剤が最下
層のトナーの周囲に多くなればなる程、トナー母剤が直
接像担持体に接触する割合は少なくなり剥離性が良好に
なる。しかし、遊離外添剤の量が多くなりすぎると、そ
れ自体が像担持体上に付着してフィルミングの原因とな
るので、本発明においては、最下層の外添剤遊離率を１
〜１０％の範囲に設定する。なお、上記では像担持体と
直接接触する最下層のトナーの遊離外添剤を他層の遊離
外添剤よりも多くするようにしたが、トナーに付着して
いる外添剤、いわゆる同期外添剤の量を多くするように
しても同様の効果が得られる。As shown in FIG. 2, when the toner is negatively charged, the free external additive composed of an insulator is also negatively charged and is carried together with the toner or between the toner and the toner by the developing electric field. Adheres to the image carrier. Usually, wax is added to the toner to improve the fixability,
For this reason, when the toner base material comes into direct contact with the image bearing member due to adhesion, the releasability decreases. Therefore, as the amount of the free external additive increases around the toner in the lowermost layer, the ratio of the toner base material in direct contact with the image carrier decreases, and the releasability improves. However, if the amount of the free external additive is too large, the free external additive itself adheres to the image carrier and causes filming. Therefore, in the present invention, the rate of release of the external additive in the lowermost layer is 1%.
Set in the range of 〜１０10%. In the above description, the amount of the free external additive in the lowermost layer of the toner that is in direct contact with the image carrier is larger than the amount of the free external additive in the other layers. The same effect can be obtained by increasing the amount of the additive.
【０００９】図３はトナー母材等価粒径と外添剤等価粒
径の同期分布曲線を説明する図であり、横軸がトナー母
材等価粒径、縦軸が外添剤等価粒径である。ここで等価
粒径について説明すると、パーティクルアナライザ法に
よるトナー粒子の分析においてはトナー粒子をプラズマ
中に導入して励起・発光させる。トナー粒子は、ポリエ
ステル等の樹脂（炭素）からなる母材に、流動性や帯電
性を向上させるためのシリカ等が外添剤として被覆され
ており、励起・発光させると元素に特有の発光スペクト
ル（周波数）と、元素量に応じた発光強度が得られる。
そこで、発光の周波数とその強度を測定し、測定結果か
ら母材や外添剤を構成する元素量（質量）がそれぞれ測
定され、母材や外添剤を構成する元素の質量を真球粒子
に換算して粒子径で表現したものが等価粒径であり、測
定される発光スペクトルの信号強度（質量に比例）の３
乗根電圧として求められる（特開平１２−４７４２５号
公報参照）。FIG. 3 is a diagram for explaining a synchronous distribution curve between the toner base material equivalent particle size and the external additive equivalent particle size. The horizontal axis represents the toner base material equivalent particle size, and the vertical axis represents the external additive equivalent particle size. is there. Here, the equivalent particle diameter will be described. In the analysis of toner particles by the particle analyzer method, the toner particles are introduced into plasma to excite and emit light. The toner particles have a matrix made of a resin (carbon) such as polyester coated with silica or the like as an external additive for improving fluidity and chargeability. When excited and emitted, the emission spectrum is specific to the element. (Frequency) and emission intensity according to the amount of element can be obtained.
Therefore, the frequency and intensity of the light emission are measured, and the amounts (mass) of the elements constituting the base material and the external additive are respectively measured from the measurement results. The equivalent particle diameter is expressed in terms of the particle diameter in terms of the particle size, and the signal intensity (proportional to the mass) of the measured emission spectrum is 3
It is obtained as a square root voltage (see Japanese Patent Application Laid-Open No. 12-47425).
【００１０】パーティクルアナライザ法では、トナー母
材と外添剤が一体のときは、発光は両者同じタイミング
で検出されるので同期している（同期トナー）と言い、
トナー母材と外添剤が遊離しているときは、発光は両者
異なるタイミングで検出されるので非同期である（非同
期トナー）と言い、図１における横軸上、縦軸上にプロ
ットされるものは非同期トナー、非同期外添剤であり、
それ以外の任意の点にプロットされるものは同期トナー
で、母材の量と外添剤の量の割合でプロット位置が決め
られる。なお、外添剤の遊離率は、 遊離外添剤の量／（遊離外添剤の量＋同期外添剤の量） として求められる。In the particle analyzer method, when the toner base material and the external additive are integrated, the light emission is detected at the same timing, so that they are said to be synchronized (synchronous toner).
When the toner base material and the external additive are separated, the light emission is detected at different timings and is therefore asynchronous (asynchronous toner), and is plotted on the horizontal axis and the vertical axis in FIG. Is an asynchronous toner, an asynchronous external additive,
What is plotted at any other point is the synchronous toner, and the plotting position is determined by the ratio of the amount of the base material to the amount of the external additive. The release rate of the external additive is obtained as (amount of free external additive / (amount of free external additive + amount of synchronous external additive)).
【００１１】また、外添剤が母材の内部に均一に分布
（内添）している場合には、母材、外添剤ともその量は
粒径の３乗に比例するので同期分布曲線は直線状とな
り、外添剤が母材表面にのみ付着している場合には、母
材の量は粒径の３乗に比例し、外添剤の量は母材の表面
積、即ち粒径の２乗に比例するので、同期分布曲線は
（２／３）乗の曲線となる。また、トナーに一定の割合
で外添剤を付着させたとき、遊離外添剤の割合が多くな
れば、同期外添剤の割合が小さくなるので同期分布曲線
の傾きは小さくなり、遊離外添剤の割合が小さくなれ
ば、同期外添剤の割合が大きくなるので同期分布曲線の
傾きは大きくなる。いま、Ｘをトナー母材等価粒径、Ｙ
を外添剤等価粒径としたとき、 Ｙ＝ｋＸ2/3 ……（１） で表され、ここではｋを傾きとしている。このｋの値か
らトナー母材に対する外添剤の付着状態が分析できる。When the external additive is uniformly distributed (internally added) inside the base material, the amount of both the base material and the external additive is proportional to the cube of the particle size, so that the synchronous distribution curve Is linear, and when the external additive adheres only to the surface of the base material, the amount of the base material is proportional to the cube of the particle size, and the amount of the external additive is the surface area of the base material, that is, the particle size. , The synchronous distribution curve becomes a (2/3) th power curve. Also, when the external additive is adhered to the toner at a fixed ratio, if the ratio of the free external additive increases, the ratio of the synchronous external additive decreases, so that the slope of the synchronous distribution curve decreases, and the free external additive decreases. If the ratio of the agent decreases, the ratio of the synchronous external additive increases, so that the slope of the synchronous distribution curve increases. Now, X is the toner base material equivalent particle size, and Y is
Is the external additive equivalent particle diameter, Y = kX 2/3 (1), where k is the slope. From the value of k, the state of attachment of the external additive to the toner base material can be analyzed.
【００１２】図３において、同期分布曲線Ａは像担持体
と直接接触する最下層のトナー、Ｂは最下層以外のトナ
ーの同期分布曲線で、最下層のトナーについての傾きを
他の層よりも大きくする。即ち、同期している外添剤の
量を多くすることにより、像担持体からのトナーの剥離
性を良好にしている。前述したように外添剤の量が多過
ぎると、像担持体上にフィルミングや定着性に影響す
る。（１）式に示した同期分布曲線Ａの傾きｋとしては
０．６〜１．０とするのが好ましい。In FIG. 3, the synchronous distribution curve A is the synchronous toner distribution curve of the lowermost layer in direct contact with the image carrier, and the synchronous distribution curve B is the synchronous distribution curve of the toner other than the lowermost layer. Enlarge. That is, by increasing the amount of the synchronized external additive, the releasability of the toner from the image carrier is improved. As described above, if the amount of the external additive is too large, it affects filming and fixability on the image carrier. It is preferable that the slope k of the synchronous distribution curve A shown in the equation (1) be 0.6 to 1.0.
【００１３】次に、本発明のトナーを用いる画像形成装
置について説明する。Next, an image forming apparatus using the toner of the present invention will be described.
【００１４】図４は中間転写体により色重ねを行い、一
括転写する画像形成装置を説明する図である。FIG. 4 is a view for explaining an image forming apparatus in which color superposition is performed by an intermediate transfer member and transfer is performed collectively.
【００１５】ロータリー式現像装置１０はＹ，Ｍ，Ｃ，
Ｋの４色の現像ローラを有していて、感光体１１に対し
て１色ずつトナー現像し、現像されたトナー像は感光体
１１から中間転写体１２に対して１色ずつ転写され、色
重ねされる。中間転写体１２上の４色のトナーのうち、
図示する最下層のトナー２についてその上に重ねられた
他の色のトナーよりも遊離外添剤の量を多くするか、あ
るいは同期している外添剤の量を多くする。こうするこ
とにより、転写ローラ１３により与えられる転写電界に
よりトナー像の剥離性が良くなって用紙１４に良好に転
写される。The rotary developing device 10 includes Y, M, C,
And a developing roller for each of the four colors K. The developed toner image is transferred to the photoconductor 11 one by one, and the developed toner image is transferred from the photoconductor 11 to the intermediate transfer body 12 one by one. Are overlaid. Of the four color toners on the intermediate transfer body 12,
In the illustrated lowermost layer toner 2, the amount of the free external additive is increased or the amount of the synchronized external additive is increased as compared with the toner of the other color superimposed thereon. By doing so, the releasability of the toner image is improved by the transfer electric field provided by the transfer roller 13, and the toner image is well transferred to the paper 14.
【００１６】図５は２段階中間転写を行う画像形成装置
を説明する図である。FIG. 5 is a view for explaining an image forming apparatus for performing two-stage intermediate transfer.
【００１７】ロータリー式現像装置１０で感光体１１を
１色ずつトナー現像し、中間転写体１２上で色重ねする
ことは図４の場合と同様である。この例においては、さ
らに中間転写体１２からバックアップローラ１５の位置
において、中間転写ローラ１６に２次転写が行われ、さ
らにバックアップローラ１７により用紙１４上に３次転
写が行われる。中間転写体１２上の４色のトナーのう
ち、最下層のトナー２についてはその遊離外添剤あるい
は同期外添剤の量を他の層より多くし、さらに中間転写
体１２上の最外層のトナー５についても同様に遊離外添
剤あるいは同期外添剤の量を多くする。即ち、中間転写
体１２から中間転写ローラ１６に転写された時、中間転
写体１２上においては、最外層のトナー５が直接中間転
写ローラ１６に接する最下層のトナーとなるので、この
トナーについても遊離外添剤あるいは同期外添剤の量を
他の層よりも多くする。こうすることより、３次転写に
おけるトナーの剥離性を良くして良好な転写が可能とな
る。As shown in FIG. 4, the development of the photoreceptor 11 in the rotary developing device 10 for each color toner is performed, and the color is superimposed on the intermediate transfer member 12. In this example, secondary transfer is performed on the intermediate transfer roller 16 at the position of the backup roller 15 from the intermediate transfer body 12, and tertiary transfer is further performed on the paper 14 by the backup roller 17. Of the four color toners on the intermediate transfer body 12, the amount of the free external additive or the synchronous external additive of the toner 2 of the lowermost layer is made larger than that of the other layers. Similarly, for the toner 5, the amount of the free external additive or the synchronous external additive is increased. That is, when the toner is transferred from the intermediate transfer member 12 to the intermediate transfer roller 16, the toner 5 in the outermost layer becomes the toner in the lowermost layer directly in contact with the intermediate transfer roller 16 on the intermediate transfer member 12. Increase the amount of free or synchronous external additives compared to the other layers. By doing so, it is possible to improve the releasability of the toner in the tertiary transfer and to perform good transfer.
【００１８】[0018]
【発明の効果】以上のように、本発明によれば、像担持
体に直接接触するトナーの遊離外添剤もしくは同期外添
剤を他の層より多くしたので、トナーの剥離性を向上さ
せ、転写を良好に行わせることが可能となる。As described above, according to the present invention, the amount of the free external additive or the synchronous external additive of the toner which comes into direct contact with the image carrier is increased as compared with the other layers, so that the releasability of the toner is improved. In addition, it is possible to perform good transfer.
【図面の簡単な説明】[Brief description of the drawings]
【図１】 本発明の画像形成装置に用いるトナーを説明
する図である。FIG. 1 is a diagram illustrating a toner used in an image forming apparatus of the present invention.
【図２】 トナーによる現像の様子を説明する図であ
る。FIG. 2 is a diagram illustrating a state of development with toner.
【図３】 トナー母剤等価粒径と外添剤等価粒径の同期
分布曲線を示す図である。FIG. 3 is a diagram showing a synchronous distribution curve of a toner base material equivalent particle size and an external additive equivalent particle size.
【図４】 本発明のトナーを使用する画像形成装置の例
を説明する図である。FIG. 4 is a diagram illustrating an example of an image forming apparatus using the toner of the present invention.
【図５】 ３次転写画像形成装置を説明する図である。FIG. 5 is a diagram illustrating a tertiary transfer image forming apparatus.
【図６】 画像形成装置に用いるトナーを説明する図で
ある。FIG. 6 is a diagram illustrating toner used in the image forming apparatus.
【図７】 画像形成装置に用いるトナーを説明する図で
ある。FIG. 7 is a diagram illustrating toner used in the image forming apparatus.
１０…ロータリー式現像装置、１１…感光体、１２…中
間転写体、１３…転写ローラ、１４…用紙、１５，１７
…バックアップローラ、１６…中間転写ローラ。DESCRIPTION OF SYMBOLS 10 ... Rotary developing device, 11 ... Photoconductor, 12 ... Intermediate transfer body, 13 ... Transfer roller, 14 ... Paper, 15, 17
... backup roller, 16 ... intermediate transfer roller.
Claims (4)
いて、像担持体と直接接触するトナーは、他の色のトナ
ーより外添剤被覆率が大きいか、或いは遊離外添剤の量
が多いことを特徴とするトナー。In a toner used in a color image forming apparatus, a toner which comes into direct contact with an image carrier has a higher external additive coverage or a larger amount of free external additives than toners of other colors. Characterized toner.
遊離率が１〜１０％であることを特徴とする請求項１記
載のトナー。2. The toner according to claim 1, wherein the additive release rate of the toner that comes into direct contact with the image carrier is 1 to 10%.
価粒径と外添剤等価粒径の同期分布曲線の傾きが０．６
〜１．０であることを特徴とする請求項１記載のトナ
ー。3. The slope of a synchronous distribution curve of a base material equivalent particle diameter and an external additive equivalent particle diameter of a toner that directly contacts an image carrier is 0.6.
The toner according to claim 1, wherein the number is from 1.0 to 1.0.
像担持体上の静電潜像をトナー現像する現像手段と、潜
像担持体のトナー画像を転写する転写手段とを備え、前
記トナーは請求項１乃至３いずれか記載のトナーである
ことを特徴とする画像形成装置。4. A latent image carrier on which an electrostatic latent image is formed, developing means for developing the electrostatic latent image on the latent image carrier with toner, and transfer means for transferring a toner image on the latent image carrier. An image forming apparatus comprising: the toner according to claim 1, wherein the toner is the toner according to claim 1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001154264A JP2002351129A (en) | 2001-05-23 | 2001-05-23 | Toner and image forming device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001154264A JP2002351129A (en) | 2001-05-23 | 2001-05-23 | Toner and image forming device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JP2002351129A true JP2002351129A (en) | 2002-12-04 |
Family
ID=18998633
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2001154264A Pending JP2002351129A (en) | 2001-05-23 | 2001-05-23 | Toner and image forming device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2002351129A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7377428B2 (en) | 2002-11-29 | 2008-05-27 | Hitachi, Ltd. | Communication terminal and information communication system |
| US7452645B2 (en) | 2004-07-16 | 2008-11-18 | Ricoh Company, Ltd. | Toner for developing electrostatic image, method for producing the same, developer, image forming apparatus, process cartridge, and image forming method |
| US7664439B2 (en) | 2005-12-08 | 2010-02-16 | Ricoh Company, Ltd. | Image forming apparatus, and carrier, toner and developer used therein for reducing foggy images |
| US7666564B2 (en) | 2004-10-19 | 2010-02-23 | Konica Minolta Business Technologies, Inc. | Method for forming image |
| JP2014199447A (en) * | 2013-03-15 | 2014-10-23 | 株式会社リコー | Image forming apparatus and process cartridge |
-
2001
- 2001-05-23 JP JP2001154264A patent/JP2002351129A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7377428B2 (en) | 2002-11-29 | 2008-05-27 | Hitachi, Ltd. | Communication terminal and information communication system |
| US7452645B2 (en) | 2004-07-16 | 2008-11-18 | Ricoh Company, Ltd. | Toner for developing electrostatic image, method for producing the same, developer, image forming apparatus, process cartridge, and image forming method |
| US7727700B2 (en) | 2004-07-16 | 2010-06-01 | Ricoh Company, Ltd. | Toner for developing electrostatic image, method for producing the same, developer, image forming apparatus, process cartridge, and image forming method |
| US7666564B2 (en) | 2004-10-19 | 2010-02-23 | Konica Minolta Business Technologies, Inc. | Method for forming image |
| US7664439B2 (en) | 2005-12-08 | 2010-02-16 | Ricoh Company, Ltd. | Image forming apparatus, and carrier, toner and developer used therein for reducing foggy images |
| JP2014199447A (en) * | 2013-03-15 | 2014-10-23 | 株式会社リコー | Image forming apparatus and process cartridge |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CA2153311A1 (en) | Latent image development apparatus | |
| JP2002351129A (en) | Toner and image forming device | |
| WO1990004810A1 (en) | Color electrophotographic method and apparatus | |
| JP2005501282A (en) | How to use multi-diameter coated particles in a one-component development system | |
| CA2387330A1 (en) | Latent image development apparatus | |
| CN101211141A (en) | Electrophotographic image forming system using transparent toner | |
| JPH065400B2 (en) | Color recording device | |
| JPH11298118A (en) | Method for forming circuit pattern and multilayer wiring bard formed thereby | |
| JPS6210670A (en) | Multicolor recorder | |
| JPH09197808A (en) | Developing device | |
| JPH1020632A (en) | Developing device | |
| JP3873527B2 (en) | Image forming apparatus | |
| JPS6388573A (en) | Color electrophotographic device | |
| JP2002304003A (en) | Toner and image forming device | |
| JPS60118853A (en) | Image forming method | |
| JPS60159763A (en) | Color recording device | |
| JPS61110163A (en) | Developing method of electrostatic latent image | |
| JPS61209466A (en) | Electrophotographic device having plural developing devices | |
| JPH09258549A (en) | Developing device | |
| JPH09244401A (en) | Developing device | |
| JPH11258918A (en) | Image recorder | |
| JPH1073985A (en) | Developing device | |
| JPH02277078A (en) | Multi color electrophotographic device | |
| JPS6380269A (en) | Developing method | |
| JP2002304009A (en) | Toner and image forming apparatus |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A977 | Report on retrieval |
Free format text: JAPANESE INTERMEDIATE CODE: A971007 Effective date: 20050401 |
|
| A131 | Notification of reasons for refusal |
Free format text: JAPANESE INTERMEDIATE CODE: A131 Effective date: 20050803 |
|
| A521 | Written amendment |
Free format text: JAPANESE INTERMEDIATE CODE: A523 Effective date: 20050927 |
|
| A131 | Notification of reasons for refusal |
Free format text: JAPANESE INTERMEDIATE CODE: A131 Effective date: 20070314 |
|
| A521 | Written amendment |
Free format text: JAPANESE INTERMEDIATE CODE: A523 Effective date: 20070425 |
|
| A02 | Decision of refusal |
Free format text: JAPANESE INTERMEDIATE CODE: A02 Effective date: 20070601 |