JP2887719B2 - Non-magnetic one-component development method - Google Patents
Non-magnetic one-component development methodInfo
- Publication number
- JP2887719B2 JP2887719B2 JP4291997A JP29199792A JP2887719B2 JP 2887719 B2 JP2887719 B2 JP 2887719B2 JP 4291997 A JP4291997 A JP 4291997A JP 29199792 A JP29199792 A JP 29199792A JP 2887719 B2 JP2887719 B2 JP 2887719B2
- Authority
- JP
- Japan
- Prior art keywords
- magnetic
- toner
- component
- component developer
- developing roller
- 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.)
- Expired - Fee Related
Links
Description
【０００１】[0001]
【産業上の利用分野】本発明は非磁性トナーを用いて静
電潜像を現像する非接触型の非磁性一成分現像方法に関
する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a non-contact type non-magnetic one-component developing method for developing an electrostatic latent image using a non-magnetic toner.
【０００２】[0002]
【従来の技術】一般に電子写真法は感光体上に電気的な
潜像を形成して、ついで該潜像をトナーによって現像
し、必要に応じて紙などの転写材にトナー画像を転写し
た後、加熱、加圧などの手段によって定着し複写物を得
るものである。このような電子写真法に用いられる現像
剤としてはトナーとキャリアからなる二成分現像剤と、
トナーとキャリアの機能を同時に備えた一成分現像剤と
がある。一成分現像剤は、さらに磁性一成分現像剤と、
非磁性一成分現像剤に分類される。二成分現像剤は、転
写性、定着性、耐環境特性などの電子写真特性に優れる
反面、トナーとキャリアの混合比を制御するためのトナ
ー濃度センサーが必要であること、現像剤の寿命が短い
こと、現像剤の攪拌機構が複雑化するなどの問題点を有
する。一方、磁性一成分現像剤は、上記のトナー濃度セ
ンサーが不要であり、現像装置の小型化が容易である反
面、磁性粒子を含むことから、定着性が劣る問題を有す
る。このような背景から装置の小型簡易化と定着特性を
両立するために、近年、非磁性トナーを一成分現像剤と
して用いる方法が提案、実用化されている。非磁性トナ
ーを用いる一成分現像方法には、現像剤を担持した現像
ローラーを静電潜像を有する感光体と接触させて現像す
る接触型の非磁性一成分現像方法と、現像ローラーと感
光体の間に一定の空隙ギャップを設けて現像ローラー上
の非磁性トナーを飛翔させて現像する非接触型の非磁性
一成分現像方法とがある。接触型の非磁性一成分現像方
法では、現像ローラー上の非磁性トナーと、静電潜像を
有する感光体が接触するため現像性は良好であるが、そ
の反面、非磁性トナーは現像装置内だけでなく、感光体
ドラムとの間でも摩擦を生ずるので、非磁性トナーに対
する機械的な負担が大きい。これに対して、非接触型の
非磁性一成分現像方法では、現像剤は層規制部材のみに
より摩擦帯電されるため、現像剤にかかる機械的負担は
少ないが、非接触であることから、接触型と比べて一般
的に現像ローラーから感光体ドラムに飛翔される非磁性
一成分現像剤の量（以下、現像性という）が少量のため
十分な画像濃度を得ることができないという問題があっ
た。2. Description of the Related Art In general, in electrophotography, an electric latent image is formed on a photoreceptor, the latent image is developed with toner, and a toner image is transferred to a transfer material such as paper as necessary. The image is fixed by means such as heat, pressure and the like to obtain a copy. As a developer used in such an electrophotographic method, a two-component developer composed of a toner and a carrier,
There is a one-component developer having both functions of a toner and a carrier. The one-component developer further includes a magnetic one-component developer,
It is classified as a non-magnetic one-component developer. The two-component developer has excellent electrophotographic properties such as transferability, fixability, and environmental resistance, but requires a toner concentration sensor to control the mixing ratio of toner and carrier, and has a short developer life. And a problem that the stirring mechanism of the developer is complicated. On the other hand, the magnetic one-component developer does not require the above-mentioned toner concentration sensor, and can easily reduce the size of the developing device, but has a problem that the fixing property is inferior because it contains magnetic particles. In view of such a background, a method using a non-magnetic toner as a one-component developer has recently been proposed and put into practical use in order to achieve both the simplification of the apparatus and the fixing characteristics. The one-component developing method using a non-magnetic toner includes a contact-type non-magnetic one-component developing method in which a developing roller carrying a developer is brought into contact with a photosensitive member having an electrostatic latent image to perform development, and a developing roller and a photosensitive member. There is a non-contact type non-magnetic one-component developing method in which a non-magnetic toner on a developing roller is caused to fly by providing a fixed gap between the non-magnetic one component and the developing. In the contact type non-magnetic one-component developing method, the non-magnetic toner on the developing roller and the photosensitive member having an electrostatic latent image are in contact with each other, so that the developing property is good. In addition, since friction occurs between the photosensitive drum and the photosensitive drum, the mechanical load on the non-magnetic toner is large. On the other hand, in the non-contact type non-magnetic one-component developing method, the developer is frictionally charged only by the layer regulating member, so that the mechanical load on the developer is small. In general, the amount of non-magnetic one-component developer (hereinafter referred to as "developability") flying from the developing roller to the photosensitive drum is smaller than that of the mold, so that a sufficient image density cannot be obtained. .
【０００３】非接触型の非磁性一成分現像法において、
現像性を向上する手段の一つとしては、現像剤である非
磁性トナーの表面に流動化向上剤としての疎水性シリカ
や疎水性アルミナ等を混合付着することにより流動性を
向上し、静電潜像へのトナーの供給量を多くすることが
提案されていた。しかしながら、このような流動化向上
剤は一般的には正または負に強い帯電極性を有する。従
って、非磁性トナーの表面に均一に混合付着させた場合
に、非磁性トナー同志が静電的に反発しあい現像ローラ
ー上で非磁性トナーの均一な薄層が得にくいという問題
があった。また、これとは逆にトナー粒子間での帯電に
より、正規とは逆の帯電を帯びるトナー粒子が発生し、
非画像部でのカブリ発生の一因となる問題も生じてい
た。また、高精細な画像を得るためには、非磁性トナー
の粒子径を例えば体積平均粒子径で１０μｍ以下の小さ
めに設定する必要があるが、非磁性トナーの粒子径を小
さくすると摩擦帯電量の上昇をきたし、現像ローラー面
への非磁性トナーの付着力が強くなるため感光体ドラム
へ飛翔する量が少なくなり、現像性がさらに悪くなる問
題があった。In a non-contact non-magnetic one-component developing method,
One of the means for improving the developing property is to improve the fluidity by mixing and adhering hydrophobic silica or hydrophobic alumina as a fluidizing improver to the surface of the non-magnetic toner as a developer, thereby improving the electrostatic property. It has been proposed to increase the amount of toner supplied to the latent image. However, such fluidization improvers generally have a strong positive or negative charge polarity. Therefore, when the non-magnetic toner is uniformly mixed and adhered to the surface of the non-magnetic toner, the non-magnetic toner repulses electrostatically, and it is difficult to obtain a uniform thin layer of the non-magnetic toner on the developing roller. Conversely, due to the charge between the toner particles, toner particles having the opposite charge to the normal charge are generated,
There has also been a problem that contributes to fogging in non-image areas. Further, in order to obtain a high-definition image, it is necessary to set the particle size of the non-magnetic toner to be as small as, for example, 10 μm or less in volume average particle size. As a result, the non-magnetic toner adheres strongly to the developing roller surface, so that the amount of the non-magnetic toner flying to the photosensitive drum is reduced, and the developing property is further deteriorated.
【０００４】[0004]
【発明が解決しようとする課題】本発明は、従来におけ
る上記の実状に鑑みてなされたものである。従って、本
発明の目的は、非接触の非磁性一成分現像方式におい
て、現像ローラー上で均一なトナー薄層が得られ、小粒
子径の非磁性トナーでも、十分な現像性が得られる現像
方法を提供することにある。SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned conventional situation. Therefore, an object of the present invention is to provide a non-contact non-magnetic one-component developing method in which a uniform toner thin layer is obtained on a developing roller, and a sufficient developing property is obtained even with a non-magnetic toner having a small particle diameter. Is to provide.
【０００５】[0005]
【課題を解決するための手段】本発明者らは、非接触型
の非磁性一成分現像方法の欠点を解消して、非磁性トナ
ーが小粒子径であっても、良好な現像性を得るための手
段について、鋭意検討した結果、非磁性トナーの後処理
剤として酸化スズアンチモンを用いることで、上記の目
的である現像ローラー上で均一なトナー薄層が得られ、
小粒子径であっても良好な現像性を有する非磁性一成分
現像剤を提供できることを見いだし、本発明を完成する
に至った。すなわち、本発明は、非磁性一成分現像剤を
現像ローラーに供給し、層規制部材により該非磁性一成
分現像剤の薄層を現像ローラーの表面に形成するととも
に電荷を与え、感光体ドラムと現像ローラーとの電位差
により該非磁性一成分現像剤を飛翔させ静電潜像を保持
する感光体ドラムに非接触で現像し、ついで転写材に転
写を行う非接触型の非磁性一成分現像方法であって、前
記非磁性一成分現像剤が、結着剤樹脂と着色剤を主体と
した非磁性トナーに体積固有抵抗率が３０Ω・ｃｍ以上
の酸化スズアンチモンを遊離した状態で保持したもので
あることを特徴とする非磁性一成分現像方法である。Means for Solving the Problems The present inventors have solved the disadvantages of the non-contact type non-magnetic one-component developing method and can obtain good developability even if the non-magnetic toner has a small particle diameter. As a result of diligent studies on the means for the use, as a result of using antimony tin oxide as a post-treatment agent for the non-magnetic toner, a uniform thin toner layer was obtained on the developing roller for the above purpose,
It has been found that a non-magnetic one-component developer having good developability can be provided even with a small particle diameter, and the present invention has been completed. That is, in the present invention, a non-magnetic one-component developer is supplied to a developing roller, a thin layer of the non-magnetic one-component developer is formed on the surface of the developing roller by a layer regulating member, and a charge is given to the photosensitive drum. A non-contact type non-magnetic one-component developing method in which the non-magnetic one-component developer is caused to fly by a potential difference from a roller and developed in a non-contact manner on a photosensitive drum holding an electrostatic latent image, and then transferred to a transfer material. The non-magnetic one-component developer has a volume specific resistivity of at least 30 Ω · cm to the non-magnetic toner mainly comprising a binder resin and a colorant.
A non-magnetic one-component developing method, wherein the tin-antimony oxide is held in a free state.
【０００６】以下、本発明を詳細に説明する。図１は、
本発明の非接触型の非磁性一成分現像方法に使用する現
像装置の概略構成図である。図中、１は感光体ドラム、
２はホッパー、３は非磁性一成分現像剤、４は層規制部
材、５は現像剤を担持するアルミニウム製スリーブを使
用した現像ローラー、６は現像剤の漏れ防止部材、７は
攪拌機である。この現像装置においては、感光体ドラム
１上には、公知の電子写真法によって静電潜像が形成さ
れる。ホッパー２内には非磁性一成分現像剤３が収容さ
れており、非磁性一成分現像剤３は、層規制部材４によ
って現像ローラー５上に一定の層厚になるように担持さ
れるとともに層規制部材４との摩擦により電荷が付与さ
れる。現像ローラー５は、感光ドラム１と１２０μｍ〜
３００μｍの空隙を介して設置されている。該ローラー
には、直流または交流電圧のバイアスを印加する。現像
ローラー５に担持された非磁性一成分現像剤は、現像ロ
ーラー５の回転により搬送されて、静電潜像を有する感
光体ドラム１と現像ローラー５との電位差によって感光
体ドラム１表面に飛翔し、非接触で静電潜像の顕像化が
行われる。Hereinafter, the present invention will be described in detail. FIG.
FIG. 1 is a schematic configuration diagram of a developing device used in a non-contact non-magnetic one-component developing method of the present invention. In the figure, 1 is a photosensitive drum,
Reference numeral 2 denotes a hopper, 3 denotes a non-magnetic one-component developer, 4 denotes a layer regulating member, 5 denotes a developing roller using an aluminum sleeve for carrying the developer, 6 denotes a developer leakage preventing member, and 7 denotes a stirrer. In this developing device, an electrostatic latent image is formed on the photosensitive drum 1 by a known electrophotographic method. A non-magnetic one-component developer 3 is accommodated in the hopper 2. The non-magnetic one-component developer 3 is supported on the developing roller 5 by a layer regulating member 4 so as to have a constant layer thickness. Electric charge is applied by friction with the regulating member 4. The developing roller 5 is in contact with the photosensitive drum 1 at 120 μm to
It is installed with a gap of 300 μm. A DC or AC voltage bias is applied to the roller. The non-magnetic one-component developer carried on the developing roller 5 is transported by the rotation of the developing roller 5 and flies to the surface of the photosensitive drum 1 due to a potential difference between the photosensitive drum 1 having an electrostatic latent image and the developing roller 5. Then, the electrostatic latent image is visualized in a non-contact manner.
【０００７】本発明における上記の方法において使用す
る非磁性一成分現像剤を構成する非磁性トナーは、結着
剤樹脂と着色剤を主成分とするものである。結着剤樹脂
としては、例えば、ポリスチレン、ポリエステル、アク
リル樹脂、スチレン−アクリル系共重合体、エチレン−
塩化ビニル系共重合体、エチレン−酢酸ビニル系共重合
体、ポリアミド、ポリエチレン、マレイン酸樹脂、キシ
レン樹脂、フェノール樹脂等があげられるが、これらに
限定されるものではない。また、着色剤としては、例え
ば、カーボンブラック、アセチレンブラック、ランプブ
ラック、チャンネルブラック、アニリンブラック等の黒
色着色剤や、有彩色であればファーナルブルー、パーマ
ネントブルー、ニグロシンブルー、フタロシアニン系シ
アン色顔料、ローズベンガル、キサンテン系マゼンタ色
染料、キナクリドン系マゼンタ色顔料、モノアゾ系赤色
顔料、ジスアゾ系黄色顔料等があげられるが、これらに
限定されるものではない。これら着色剤は、結着剤樹脂
１００重量部に対して１〜１０重量部の範囲で適宜配合
される。上記非磁性トナーには、所望により他の成分、
例えば帯電制御剤、低分子量ポリプロピレン等の添加剤
等を含有させてもよい。非磁性トナーは、体積平均粒子
径で１２μｍ以下、好ましくは、３〜９．５μｍの粒子
径を有するものがよい。３μｍ未満であると、十分な流
動性が得られない。一方、９．５μｍより大きいと細
線、文字等の画素の再現性が悪くなる。[0007] The non-magnetic toner constituting the non-magnetic one-component developer used in the above method of the present invention is mainly composed of a binder resin and a colorant. As the binder resin, for example, polystyrene, polyester, acrylic resin, styrene-acrylic copolymer, ethylene-
Examples include, but are not limited to, vinyl chloride copolymers, ethylene-vinyl acetate copolymers, polyamides, polyethylenes, maleic resins, xylene resins, phenolic resins, and the like. Examples of the colorant include, for example, black colorants such as carbon black, acetylene black, lamp black, channel black, and aniline black. , Rose bengal, xanthene-based magenta dyes, quinacridone-based magenta color pigments, monoazo-based red pigments, disazo-based yellow pigments, and the like, but are not limited thereto. These colorants are appropriately blended in the range of 1 to 10 parts by weight based on 100 parts by weight of the binder resin. In the non-magnetic toner, if necessary, other components,
For example, an additive such as a charge control agent and a low molecular weight polypropylene may be contained. The non-magnetic toner preferably has a volume average particle diameter of 12 μm or less, preferably 3 to 9.5 μm. If it is less than 3 μm, sufficient fluidity cannot be obtained. On the other hand, if it is larger than 9.5 μm, the reproducibility of pixels such as fine lines and characters deteriorates.
【０００８】本発明に使用する酸化スズアンチモンと
は、酸化スズ微粉末にアンチモンをドープしたものであ
り、ＳｎＯ2 の原子配列の一部のＳｎがＳｂで置換され
た金属化合物であって、具体的には、三菱マテリアル社
の商品名Ｔ−１等が挙げられる。本発明において非磁性
トナーに遊離した状態で保持させる酸化スズアンチモン
は、体積固有抵抗率が３０Ω・cm以上のものが望まし
い。３０Ω・cmより小さいものであると、現像ローラー
上に良好なトナー薄層が形成されず、また、現像機から
のトナー飛散が多くなる。本発明でいう体積固有抵抗率
は、シリンダー内に配設した面積５ｃｍ2 の上部電極お
よび面積５ｃｍ2 の下部電極間に酸化スズアンチモン５
ｇ秤量し、２００ｇ／cm2 の応力がかかるように装填し
て、電圧を印加し電極間の抵抗値をテスターにて測定す
ることにより得られる。酸化スズアンチモンの非磁性ト
ナーへの添加量は、非磁性トナー１００重量部に対し
て、０．１〜５重量部が望ましい。０．１重量部より少
ないと非磁性トナーの摩擦帯電量が高く、実用上十分な
画像濃度が得られない。一方、５重量部より多いと、摩
擦帯電量が低すぎて現像ローラー上に良好なトナー薄層
が形成されず、また、現像機からのトナー飛散が多くな
る。非磁性トナーに酸化スズアンチモンを遊離した状態
で保持させるためには、通常の粉体用混合機であるヘン
シェルミキサー、スーパーミキサー等の混合機を用いて
所定の混合比で混合された非磁性トナーと酸化スズアン
チモンの混合物を攪拌することにより行うことができ
る。ヘンシェルミキサー、スーパーミキサー等の粉体混
合機を用いる場合には、温和な攪拌条件で比較的短時間
の混合でよい。また、流動性の調整のため、流動性向上
剤である疎水性シリカや疎水性アルミナなどを該酸化ス
ズアンチモンと同時に添加することもできる。この場合
にも上記と同様の粉体混合法を用いることが可能であ
る。The antimony tin oxide used in the present invention is obtained by doping tin oxide fine powder with antimony, and is a metal compound in which part of Sn in the atomic arrangement of SnO 2 is replaced by Sb. Specifically, a product name T-1 of Mitsubishi Materials Corporation and the like can be mentioned. In the present invention, antimony tin oxide held in a non-magnetic toner in a released state preferably has a volume specific resistivity of 30 Ω · cm or more. If it is less than 30 Ω · cm, a good toner thin layer will not be formed on the developing roller, and toner scattering from the developing machine will increase. The specific volume resistivity referred to in the present invention is defined as the value of tin antimony oxide between an upper electrode having an area of 5 cm 2 and a lower electrode having an area of 5 cm 2 provided in a cylinder.
g, weighed, loaded so as to apply a stress of 200 g / cm 2 , apply a voltage, and measure the resistance between the electrodes with a tester. The amount of antimony tin oxide added to the nonmagnetic toner is preferably 0.1 to 5 parts by weight based on 100 parts by weight of the nonmagnetic toner. When the amount is less than 0.1 part by weight, the triboelectric charge of the nonmagnetic toner is high, and a practically sufficient image density cannot be obtained. On the other hand, if the amount is more than 5 parts by weight, the amount of triboelectric charge is too low to form a good thin toner layer on the developing roller, and the toner scatters from the developing machine. In order for non-magnetic toner to keep tin-antimony oxide in a released state, non-magnetic toner mixed at a predetermined mixing ratio using a mixer such as a Henschel mixer or a super mixer, which is a usual mixer for powder, is used. And a mixture of tin and antimony oxide. When a powder mixer such as a Henschel mixer or a super mixer is used, mixing may be performed for a relatively short time under mild stirring conditions. In order to adjust the fluidity, a fluidity improver such as hydrophobic silica or hydrophobic alumina can be added simultaneously with the antimony tin oxide. In this case, the same powder mixing method as described above can be used.
【０００９】[0009]
【作用】現像ローラー上で均一なトナー薄層を得るため
には、トナー粒子間での静電的な反発や、トナー粒子間
の帯電によるトナー粒子どうしの静電的な凝集を防ぐこ
とが必要である。酸化スズアンチモンを非磁性トナー表
面に遊離した状態で保持させることにより、上記のよう
なトナー粒子どうしの静電気的な反発や凝集が低減さ
れ、スリーブ上に良好なトナー薄層を形成することがで
きる。トナー粒子径が小さい場合には、一般に現像ロー
ラー上での摩擦帯電量が高くなり、現像性が悪くなる。
このような現象に対しても、酸化スズアンチモンの添加
により、摩擦帯電量の低減が可能であり、良好な現像性
を得るための有効な手段となる。In order to obtain a uniform thin toner layer on the developing roller, it is necessary to prevent electrostatic repulsion between toner particles and electrostatic aggregation of toner particles due to charging between toner particles. It is. By keeping antimony tin oxide free on the surface of the non-magnetic toner, electrostatic repulsion and aggregation of the toner particles as described above are reduced, and a good thin toner layer can be formed on the sleeve. . When the toner particle size is small, the amount of triboelectric charge on the developing roller generally increases, and the developability deteriorates.
Even with such a phenomenon, the addition of antimony tin oxide can reduce the triboelectric charge amount, which is an effective means for obtaining good developability.
【００１０】[0010]
【実施例】以下、実施例に基づき本発明を説明する。な
お、実施例において部とは重量部を示す。 実施例１ 下記の配合で原料の混合、溶融混練、粉砕分級を行い、
体積平均粒子径７．５μｍの非磁性トナーを得た。この
非磁性トナー１００部に酸化スズアンチモン（三菱マテ
リアル社製 商品名；Ｔ−１ 体積固有抵抗率；９３Ω
・cm）を０．６部添加して、ヘンシェルミキサーで２分
間攪拌することで、本発明の非磁性一成分現像剤を得
た。 The present invention will be described below with reference to examples. In the examples, parts are parts by weight. Example 1 The raw materials were mixed, melt-kneaded, and pulverized and classified according to the following formulation.
A non-magnetic toner having a volume average particle size of 7.5 μm was obtained. 100 parts of this non-magnetic toner is provided with antimony tin oxide (trade name, manufactured by Mitsubishi Materials Corporation; T-1 volume resistivity; 93 Ω).
.Cm) and stirred with a Henschel mixer for 2 minutes to obtain a non-magnetic one-component developer of the present invention.
【００１１】実施例２ 実施例１の非磁性トナー１００部に酸化スズアンチモン
（三菱マテリアル社製商品名；Ｔ−１ 体積固有抵抗
率；９３Ω・cm）を０．４５部と疎水性アルミナ（日本
アエロジル社製 商品名；ＲＦＹ−Ｃ）を０．２５部と
を同時に添加し、実施例１と同様の混合方法にて、本発
明の非磁性一成分現像剤を得た。Example 2 To 100 parts of the non-magnetic toner of Example 1, 0.45 part of antimony tin oxide (trade name, manufactured by Mitsubishi Materials Corporation; T-1 volume resistivity: 93 Ω · cm) was added to hydrophobic alumina (Japan). 0.25 parts of Aerosil (product name; RFY-C) was added at the same time, and the non-magnetic one-component developer of the present invention was obtained by the same mixing method as in Example 1.
【００１２】比較例１ 実施例１の非磁性トナーそのものを比較用の非磁性一成
分現像剤とした。Comparative Example 1 The non-magnetic toner of Example 1 was used as a comparative non-magnetic one-component developer.
【００１３】比較例２ 実施例１の非磁性トナー１００部に疎水性アルミナ（日
本アエロジル社製 商品名；ＲＦＹ−Ｃ）を０．２５部
添加し、実施例１と同様の混合方法にて、比較用の非磁
性一成分現像剤を得た。比較例３ 実施例１の非磁性トナー１００部に酸化スズアンチモン
（体積固有抵抗率：２４Ω・ｃｍ）を０．６部添加し、
実施例１と同様の混合方法にて、比較用の非磁性一成分
現像剤を得た。 Comparative Example 2 0.25 parts of hydrophobic alumina (trade name: RFY-C, manufactured by Nippon Aerosil Co., Ltd.) was added to 100 parts of the non-magnetic toner of Example 1.
The mixture was added , and a non-magnetic one-component developer for comparison was obtained in the same mixing method as in Example 1. Comparative Example 3 Antimony tin oxide was added to 100 parts of the non-magnetic toner of Example 1.
(Volume resistivity: 24 Ω · cm) is added by 0.6 part,
In the same mixing method as in Example 1, a non-magnetic one component for comparison was used.
A developer was obtained.
【００１４】以上の操作で得られた非磁性一成分現像剤
を用いて、市販の磁性一成分プリンター（京セラ社製
商品名；Ｌ−８８０）の改造機（現像バイアスを直流電
圧−１００Ｖおよび感光体の表面電位を−９００Ｖに改
造したもの）を用いて、プリントテストを行った。その
結果、実施例１、２の非磁性一成分現像剤はいずれも現
像ローラー上に均一なトナー薄層が得られ、また、転写
紙に感光体ドラムから転写された非磁性一成分現像剤の
ベタ画像をマクベス反射濃度計で測定すると実施例１は
１．３５、実施例２は１．３６という良好な画像濃度が
得られ現像ローラーから感光体ドラムに十分な量の非磁
性一成分現像剤が飛翔されていることが裏付けられた。
これに対し、比較例１、比較例２および比較例３の非磁
性一成分現像剤は、現像ローラー上に均一なトナー薄層
が得られず、また摩擦帯電量が高く、ベタ画像をマクベ
ス反射濃度計で測定すると比較例１は０．６５、比較例
２は０．７２、比較例３は０．５９という低い画像濃度
であり感光体ドラムへの非磁性一成分現像剤の飛翔量が
少量であることが確認された。Using a non-magnetic one-component developer obtained by the above operation, a commercially available magnetic one-component printer (manufactured by Kyocera Corporation)
A print test was performed using a remodeled machine (trade name: L-880) (developing bias changed to DC voltage -100 V and photoreceptor surface potential changed to -900 V). As a result, in each of the non-magnetic one-component developers of Examples 1 and 2, a uniform thin toner layer was obtained on the developing roller, and the non-magnetic one-component developer transferred from the photosensitive drum to the transfer paper was used. When a solid image was measured with a Macbeth reflection densitometer, a good image density of 1.35 was obtained in Example 1 and 1.36 in Example 2, and a sufficient amount of non-magnetic one-component developer from the developing roller to the photosensitive drum was obtained. Was confirmed to be flying.
On the other hand, the non-magnetic one-component developers of Comparative Examples 1 , 2 and 3 did not provide a uniform thin toner layer on the developing roller, had a high triboelectric charge amount, and caused a Macbeth reflection of a solid image. When measured with a densitometer, Comparative Example 1 had a low image density of 0.65, Comparative Example 2 had a low image density of 0.72, and Comparative Example 3 had a low image density of 0.59 , and the amount of non-magnetic one-component developer flying on the photosensitive drum was small. Was confirmed.
【００１５】[0015]
【発明の効果】本発明は、上記のように、酸化スズアン
チモンを非磁性トナー表面に遊離した状態で保持させる
ことにより、現像ローラー上に均一なトナー薄層を得る
ことができ、かつ非磁性トナーが小粒子径であっても良
好な現像性を得ることができる。As described above, according to the present invention, a uniform thin toner layer can be obtained on the developing roller by keeping antimony tin oxide free from the surface of the non-magnetic toner. Good developability can be obtained even if the toner has a small particle size.
【図１】図１は、本発明を実施するための非接触型の非
磁性一成分現像装置の概略断面図である。FIG. 1 is a schematic cross-sectional view of a non-contact type non-magnetic one-component developing apparatus for carrying out the present invention.
１ 感光体ドラム ２ ホッパー ３ 非磁性一成分現像剤 ４ 層規制部材 ５ 現像ローラー ６ 現像剤の漏れ防止部材 ７ 攪拌機 REFERENCE SIGNS LIST 1 photoconductor drum 2 hopper 3 non-magnetic one-component developer 4 layer regulating member 5 developing roller 6 developer leakage prevention member 7 stirrer
Claims (3)
給し、層規制部材により該非磁性一成分現像剤の薄層を
現像ローラーの表面に形成するとともに電荷を与え、感
光体ドラムと現像ローラーとの電位差により該非磁性一
成分現像剤を飛翔させ静電潜像を保持する感光体ドラム
に非接触で現像し、ついで転写材に転写を行う非接触型
の非磁性一成分現像方法であって、前記非磁性一成分現
像剤が、結着剤樹脂と着色剤を主体とした非磁性トナー
に体積固有抵抗率が３０Ω・ｃｍ以上の酸化スズアンチ
モンを遊離した状態で保持したものであることを特徴と
する非磁性一成分現像方法。1. A non-magnetic one-component developer is supplied to a developing roller, and a thin layer of the non-magnetic one-component developer is formed on a surface of the developing roller by a layer regulating member and is given an electric charge. A non-contact type non-magnetic one-component developing method in which the non-magnetic one-component developer is caused to fly by a potential difference with the photosensitive drum holding an electrostatic latent image in a non-contact manner, and then transferred to a transfer material. The non-magnetic one-component developer is a non-magnetic toner mainly composed of a binder resin and a colorant, and has a volume specific resistivity of 30 Ω · cm or more in a state where tin antimony oxide is held in a released state. Characteristic non-magnetic one-component developing method.
スズアンチモンを０．１〜５重量部添加したことを特徴
とする請求項１記載の非磁性一成分現像方法。2. The non-magnetic one-component developing method according to claim 1, wherein 0.1 to 5 parts by weight of antimony tin oxide is added to 100 parts by weight of the non-magnetic toner.
９．５μｍであることを特徴とする請求項１記載の非磁
性一成分現像方法。3. The non-magnetic toner having a volume average particle diameter of 3 to 3.
2. The non-magnetic one-component developing method according to claim 1, wherein the thickness is 9.5 [mu] m.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4291997A JP2887719B2 (en) | 1992-10-07 | 1992-10-07 | Non-magnetic one-component development method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4291997A JP2887719B2 (en) | 1992-10-07 | 1992-10-07 | Non-magnetic one-component development method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH06118693A JPH06118693A (en) | 1994-04-28 |
| JP2887719B2 true JP2887719B2 (en) | 1999-04-26 |
Family
ID=17776192
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP4291997A Expired - Fee Related JP2887719B2 (en) | 1992-10-07 | 1992-10-07 | Non-magnetic one-component development method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2887719B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1298498B1 (en) | 2001-09-28 | 2005-07-06 | Canon Kabushiki Kaisha | Toner and image forming method |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH02163756A (en) * | 1988-12-16 | 1990-06-25 | Matsushita Electric Ind Co Ltd | Electrically conductive color toner |
| JPH0424646A (en) * | 1990-05-18 | 1992-01-28 | Matsushita Electric Ind Co Ltd | Electrostatic latent image developing toner |
| JP2704789B2 (en) * | 1990-10-02 | 1998-01-26 | キヤノン株式会社 | Non-magnetic-color toner for components |
-
1992
- 1992-10-07 JP JP4291997A patent/JP2887719B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH06118693A (en) | 1994-04-28 |
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