JPS623949B2 - - Google Patents
Info
- Publication number
- JPS623949B2 JPS623949B2 JP53022481A JP2248178A JPS623949B2 JP S623949 B2 JPS623949 B2 JP S623949B2 JP 53022481 A JP53022481 A JP 53022481A JP 2248178 A JP2248178 A JP 2248178A JP S623949 B2 JPS623949 B2 JP S623949B2
- Authority
- JP
- Japan
- Prior art keywords
- toner
- charging
- developer
- layer
- conductive
- 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
Links
- 239000013013 elastic material Substances 0.000 claims 1
- 239000010410 layer Substances 0.000 description 30
- 108091008695 photoreceptors Proteins 0.000 description 13
- 238000000034 method Methods 0.000 description 5
- 239000000463 material Substances 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- PPBRXRYQALVLMV-UHFFFAOYSA-N Styrene Chemical compound C=CC1=CC=CC=C1 PPBRXRYQALVLMV-UHFFFAOYSA-N 0.000 description 2
- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 description 2
- 229920001971 elastomer Polymers 0.000 description 2
- WUPHOULIZUERAE-UHFFFAOYSA-N 3-(oxolan-2-yl)propanoic acid Chemical compound OC(=O)CCC1CCCO1 WUPHOULIZUERAE-UHFFFAOYSA-N 0.000 description 1
- IICCLYANAQEHCI-UHFFFAOYSA-N 4,5,6,7-tetrachloro-3',6'-dihydroxy-2',4',5',7'-tetraiodospiro[2-benzofuran-3,9'-xanthene]-1-one Chemical compound O1C(=O)C(C(=C(Cl)C(Cl)=C2Cl)Cl)=C2C21C1=CC(I)=C(O)C(I)=C1OC1=C(I)C(O)=C(I)C=C21 IICCLYANAQEHCI-UHFFFAOYSA-N 0.000 description 1
- 239000004593 Epoxy Substances 0.000 description 1
- ISWSIDIOOBJBQZ-UHFFFAOYSA-N Phenol Chemical compound OC1=CC=CC=C1 ISWSIDIOOBJBQZ-UHFFFAOYSA-N 0.000 description 1
- BUGBHKTXTAQXES-UHFFFAOYSA-N Selenium Chemical compound [Se] BUGBHKTXTAQXES-UHFFFAOYSA-N 0.000 description 1
- 239000004809 Teflon Substances 0.000 description 1
- 229920006362 Teflon® Polymers 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910052980 cadmium sulfide Inorganic materials 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 239000006229 carbon black Substances 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 239000011247 coating layer Substances 0.000 description 1
- 239000003086 colorant Substances 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 239000003989 dielectric material Substances 0.000 description 1
- 229910002804 graphite Inorganic materials 0.000 description 1
- 239000010439 graphite Substances 0.000 description 1
- 239000000696 magnetic material Substances 0.000 description 1
- 229920001084 poly(chloroprene) Polymers 0.000 description 1
- 229920003225 polyurethane elastomer Polymers 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- 229930187593 rose bengal Natural products 0.000 description 1
- 229940081623 rose bengal Drugs 0.000 description 1
- STRXNPAVPKGJQR-UHFFFAOYSA-N rose bengal A Natural products O1C(=O)C(C(=CC=C2Cl)Cl)=C2C21C1=CC(I)=C(O)C(I)=C1OC1=C(I)C(O)=C(I)C=C21 STRXNPAVPKGJQR-UHFFFAOYSA-N 0.000 description 1
- 229910052711 selenium Inorganic materials 0.000 description 1
- 239000011669 selenium Substances 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 229920002379 silicone rubber Polymers 0.000 description 1
- 239000004945 silicone rubber Substances 0.000 description 1
- XOSXWYQMOYSSKB-LDKJGXKFSA-L water blue Chemical compound CC1=CC(/C(\C(C=C2)=CC=C2NC(C=C2)=CC=C2S([O-])(=O)=O)=C(\C=C2)/C=C/C\2=N\C(C=C2)=CC=C2S([O-])(=O)=O)=CC(S(O)(=O)=O)=C1N.[Na+].[Na+] XOSXWYQMOYSSKB-LDKJGXKFSA-L 0.000 description 1
- 239000011787 zinc oxide Substances 0.000 description 1
Landscapes
- Dry Development In Electrophotography (AREA)
- Magnetic Brush Developing In Electrophotography (AREA)
Description
【発明の詳細な説明】
本発明は、トナーのみから成る１成分現像剤を
用いて静電潜像を現像する現像装置に関するもの
である。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a developing device that develops an electrostatic latent image using a one-component developer consisting only of toner.
従来、トナーのみから成る１成分現像剤を使用
して感光体上に形成された静電潜像を現像する方
法としては特開昭47−13088号及び特公昭51−
36070号が知られている。この現像方式は、弾性
を有する導電性材料からなる現像ローラー上にト
ナーを吸着して搬送し、搬送途中で複数の摩擦帯
電兼トナー分配ブレードによつて上記トナーを帯
電させ、感光体上の静電潜像を現像するものであ
る。しかしながら、このような現像方式において
は、トナーを摩擦帯電することによつて、それに
電荷を付与しているので、(1)トナーの電位の立ち
上がりが遅いこと、(2)トナーの帯電極性及び電位
は使用されるトナーと摩擦帯電ブレードの材質に
より一義的に決まつてしまうものであり余裕度が
無い、(3)長時間使用すると摩擦帯電ブレードが摩
耗し帯電効率が低下してしまう等の欠点があつ
た。 Conventionally, methods for developing an electrostatic latent image formed on a photoreceptor using a one-component developer consisting only of toner are disclosed in Japanese Patent Application Laid-open No. 47-13088 and Japanese Patent Publication No. 1983-1989.
No. 36070 is known. In this development method, toner is attracted onto a developing roller made of an elastic conductive material and transported. During transport, the toner is charged by a plurality of frictional charging and toner distribution blades, and the toner is statically charged on a photoreceptor. It is used to develop an electrostatic latent image. However, in this type of development method, since an electric charge is imparted to the toner by triboelectrically charging it, (1) the rise of the potential of the toner is slow, and (2) the charge polarity and potential of the toner are This is determined primarily by the toner used and the material of the triboelectric charging blade, and there is no margin for this.(3) Disadvantages include the fact that the tribocharging blade wears out and the charging efficiency decreases when used for a long period of time. It was hot.
一方、第１図及び第２図に示すようなバイアス
電圧の印加された帯電電極を現像ローラーに近接
させて、現像ローラー上のトナーを帯電させるも
のが提案されている。第１図において、符号１は
感光体ドラムで示矢方向に回転しており、現像ロ
ーラー２も感光体ドラム１との接触部で同方向に
移動するよう反時計方向に回転している。現像ロ
ーラー２は導電性支持体３とその表面に形成され
た導電性の弾性体層４から構成されている。現像
ローラー２の上部にはトナーを貯蔵したトナーホ
ツパー５が配置されていて現像ローラー２上にト
ナーを補給する。補給されたトナーは２つの帯電
電極６，７により所定の極性に帯電される。帯電
電極６，７には所定のバイアス電圧が印加されて
おり、両電極は図に示すように互いに近接して設
けられている。本方式によるトナーの帯電原理は
現像ローラー２上のトナー層８に接触する帯電電
極６，７と導電性支持体３との間の電位差により
トナーが帯電されるのである。ところで、これは
トナー層８を閉回路の１部として電流が流れるの
であるが、その際、電荷の１部がトナーに捕獲さ
れてトナーが帯電するのである。しかし、帯電電
極６，７が近接していて、両電極間の電気抵抗
R1が電極と導電性支持体３との間の電気抵抗R2
よりも小であると、帯電電極６，７からトナー層
８に流れ込んだ電流は全て導電性支持体３に流れ
ず、１部が電極６，７間を流れてしまいトナーの
帯電効率が低下してしまうことが起こつた。ま
た、第２図は、帯電電極９は１つであり、これが
現像部に近い位置に設けられた例を示すものであ
る。他の構成は第１図と同じなので同一符号を付
して説明する。導電性の弾性体層４の厚さが大で
あるため、帯電電極９と導電性支持体３との距離
が大きく、従つて、その間の電気抵抗R3が現像
部でトナー層８と接触する感光体１と帯電電極９
との間の電気抵抗R4よりも大きくなるため、帯
電電極９から流れ出た電流の一部がトナー層８と
感光体１との接触部へ流れ込んで現像時、静電潜
像を乱してしまう問題が発生した。 On the other hand, a method has been proposed in which a charging electrode to which a bias voltage is applied as shown in FIGS. 1 and 2 is brought close to the developing roller to charge the toner on the developing roller. In FIG. 1, reference numeral 1 denotes a photoreceptor drum, which rotates in the direction indicated by the arrow, and the developing roller 2 also rotates counterclockwise at the contact portion with the photoreceptor drum 1 so as to move in the same direction. The developing roller 2 is composed of a conductive support 3 and a conductive elastic layer 4 formed on the surface thereof. A toner hopper 5 storing toner is disposed above the developing roller 2 and replenishes the toner onto the developing roller 2. The supplied toner is charged to a predetermined polarity by two charging electrodes 6 and 7. A predetermined bias voltage is applied to the charging electrodes 6 and 7, and both electrodes are provided close to each other as shown in the figure. The principle of charging the toner according to this method is that the toner is charged by the potential difference between the charging electrodes 6 and 7 that are in contact with the toner layer 8 on the developing roller 2 and the conductive support 3. Incidentally, this is because current flows through the toner layer 8 as part of a closed circuit, and at that time, part of the charge is captured by the toner, and the toner is charged. However, the charged electrodes 6 and 7 are close to each other, and the electrical resistance between the two electrodes is
R 1 is the electrical resistance between the electrode and the conductive support 3 R 2
If the current is smaller than that, all of the current flowing into the toner layer 8 from the charging electrodes 6 and 7 will not flow to the conductive support 3, but a portion will flow between the electrodes 6 and 7, reducing the toner charging efficiency. Something happened that turned me off. Further, FIG. 2 shows an example in which the number of charging electrodes 9 is one, and this is provided at a position close to the developing section. Since the other configurations are the same as those in FIG. 1, they will be explained using the same reference numerals. Since the thickness of the conductive elastic layer 4 is large, the distance between the charging electrode 9 and the conductive support 3 is large, and therefore the electrical resistance R 3 between them comes into contact with the toner layer 8 in the developing section. Photoreceptor 1 and charged electrode 9
Since the electrical resistance between the toner layer 8 and the photoconductor 1 becomes larger than the electrical resistance R 4 , a part of the current flowing from the charging electrode 9 flows into the contact area between the toner layer 8 and the photoreceptor 1 and disturbs the electrostatic latent image during development. A problem occurred.
本発明は、複数個の帯電電極を用いてトナーの
帯電効率を上げるとともに良好な現像を行うよう
にした静電潜像の現像装置を提供することを目的
とするものである。 SUMMARY OF THE INVENTION An object of the present invention is to provide an electrostatic latent image developing device that uses a plurality of charging electrodes to increase toner charging efficiency and to perform good development.
本発明は、現像剤供与部材上の現像剤を複数個
の帯電電極で帯電させるものであつて、帯電電極
相互間の電気抵抗よりも、帯電電極と現像剤供予
部材を介して接地までの電気抵抗を小さくしたこ
とを特徴とするものである。 In the present invention, the developer on the developer supplying member is charged with a plurality of charging electrodes. It is characterized by low electrical resistance.
本発明によれば、複数個の帯電電極を用いたの
で、現像剤供与部材を比較的高速度で回転させて
も、効率よくトナーを帯電させることができる。 According to the present invention, since a plurality of charging electrodes are used, toner can be efficiently charged even when the developer supply member is rotated at a relatively high speed.
以下、本発明の実施例について図面を参照しな
がら説明することにする。 Embodiments of the present invention will be described below with reference to the drawings.
第３図は、本発明の原理を説明するための図で
ある。図において符号１０はトナー供与体であ
り、便宜上平担な移動物体として示しているが実
際は後述する如くエンドレスな表面を有してい
る。トナー供与体１０は接地された導電性支持体
１１と、導電層１２とから構成されており、その
上にトナー層１３が形成されている。トナー層１
３と接触するように第１電極１４及び第２電極１
５がそれぞれ互いに所定距離離れて配設されてい
る。第２電極１５の後方には静電潜像担持体１６
が帯電されたトナー層１３と接触するように回転
ローラー１７に案内されている。第１、第２電極
１４，１５にはバイアス電圧１８，１９がそれぞ
れ印加されている。ところで、導電層１２の静電
潜像担持体１６、第２電極１５、第１電極１４と
それぞれ対向する部分をＡ，Ｂ，Ｃとし、導電性
支持体１１の第２電極１５及び第１電極１４と対
向する部分をＤ，Ｅとする。導電層１２が電気的
に均一且つ等方的な材質により構成されていると
すれば、電気抵抗Ｒは距離に比例することにな
る。従つて各電極１４，１５から流れる電流が全
て有効に導電性支持体１１に流れるようにするた
めには、それぞれがトナー層１３と接触する位置
の近傍にそれと導電性支持体１１との間の電気抵
抗よりも小さい電気抵抗値を有する閉回路の形成
される部材がないことが必要である。図において
は，＞，なる関係が成立するように
第１、第２電極１４，１５を配置している。従つ
て、電気抵抗値もＲ〓〓、Ｒ〓〓＞Ｒ〓〓、Ｒ〓
〓の関係が得られることになる。 FIG. 3 is a diagram for explaining the principle of the present invention. In the figure, reference numeral 10 denotes a toner donor, which is shown as a flat moving object for convenience, but actually has an endless surface as will be described later. The toner donor 10 is composed of a grounded conductive support 11 and a conductive layer 12, on which a toner layer 13 is formed. toner layer 1
The first electrode 14 and the second electrode 1 are in contact with each other.
5 are arranged at a predetermined distance from each other. An electrostatic latent image carrier 16 is provided behind the second electrode 15.
is guided by a rotating roller 17 so as to come into contact with the charged toner layer 13. Bias voltages 18 and 19 are applied to the first and second electrodes 14 and 15, respectively. Incidentally, the portions of the conductive layer 12 that face the electrostatic latent image carrier 16, the second electrode 15, and the first electrode 14 are designated as A, B, and C, respectively, and the portions of the conductive layer 12 that face the electrostatic latent image carrier 16, the second electrode 15, and the first electrode The portions facing 14 are designated as D and E. If the conductive layer 12 is made of an electrically uniform and isotropic material, the electrical resistance R will be proportional to the distance. Therefore, in order to ensure that all of the current flowing from each electrode 14, 15 effectively flows to the conductive support 11, it is necessary to place a gap between each electrode and the conductive support 11 in the vicinity of the position where each electrode contacts the toner layer 13. It is necessary that there be no members forming a closed circuit having an electrical resistance value smaller than the electrical resistance. In the figure, the first and second electrodes 14 and 15 are arranged so that the relationship >, holds true. Therefore, the electrical resistance values are also R〓〓, R〓〓>R〓〓, R〓
The following relationship will be obtained.
第４図は本発明の実施例を示すものである。可
撓性の感光体２０は導電層２１と感光層２２とか
ら構成されており、示矢方向に移動している。感
光層２２としては酸化亜鉛、セレン、硫化カドミ
ウム、有機光導電体等が用いられる。現像ローラ
ー２３は、導電性支持体２４と、この上に形成さ
れた第１導電層２５と、さらにこの上に形成され
た第２導電層２６とから構成されている。第１、
第２導電層２５，２６の少なくとも一方は弾性を
有しており、例えばカーボン、グラフアイト、ア
ルミニウム粉等を混入したゴム材が好適である。
ゴム材の中でもトナーを保持、搬送する上でシリ
コンゴム、クロロプレンゴム、ポリウレタンゴム
は特に優れた結果が得られた。電気的性質として
は、体積固有抵抗値が108Ωcm以下のものが好ま
しい。もちろん第１導電層２５と第２導電層２６
の抵抗値が違つても差し支えないが、後述する導
電性電極と、他のトナー層と接触する部材と、導
電性支持体２４との電気的な関係は上述した条件
でなければならないことは当然である。現像ロー
ラー２３の上部にはトナーホツパー２７が配置さ
れていて、その中にトナーが貯蔵されている。使
用されるトナーとしては、エポキシ系、スチレン
系、フエノール系等の樹脂を主成分として、これ
にカーボンブラツク、ローズベンガル、アニリン
ブルー等の着色剤と、シリカ、テフロン等の添加
剤を混入したものから成り、また、これに
Fe3O4、CrO2等の磁性体を混入した磁性トナー
としてもよい。トナーを十分帯電させ、かつ帯電
後現像までの間に帯電電荷を保持するのに十分な
ように、体積抵抗率が1014Ωcm以上の絶縁性であ
ることが必要である。トナーはトナーホツパー２
７から現像ローラー２３上に供給され、上記トナ
ーホツパー２７の１側に取り付けられている第１
帯電電極２８と、その後方に設けられた第２帯電
電極２９は何れも導電性でバイアス電圧が印加さ
れている。そして、両電極２８，２９は、現像ロ
ーラー２３上のトナー層厚を規制する作用も行つ
ている。ところで、帯電電極２８，２９に印加す
るバイアス電圧はトナー層厚が0.05mm、トナーの
体積固有抵抗値が1014〜1016Ωcm、現像ローラー
周速が200mm／secの時、200Vを印加して良好な
帯電結果が得られた。現像ローラー２３上のトナ
ー層３０の厚さは約50μｍと極めて薄いため、現
像部において、感光体２０とその表面が接触して
傷付ける恐れがある。また現像ローラー２３を感
光体２０との接触面積を増やし現像効率を上げる
ため現像ローラー２３の導電性被覆層は弾性にす
る必要がある。現像ローラー２３を感光体２０に
所定の圧力で押しつけ、いわゆる加圧現像を行
う。従つて、トナーの体積抵抗率は加圧接触抵抗
値として本明細書中で述べている。 FIG. 4 shows an embodiment of the present invention. A flexible photoreceptor 20 is composed of a conductive layer 21 and a photosensitive layer 22, and moves in the direction of the arrow. As the photosensitive layer 22, zinc oxide, selenium, cadmium sulfide, organic photoconductor, etc. are used. The developing roller 23 is composed of a conductive support 24, a first conductive layer 25 formed thereon, and a second conductive layer 26 further formed thereon. First,
At least one of the second conductive layers 25 and 26 has elasticity, and is preferably made of a rubber material mixed with carbon, graphite, aluminum powder, etc., for example.
Among the rubber materials, particularly excellent results were obtained with silicone rubber, chloroprene rubber, and polyurethane rubber in holding and transporting toner. As for electrical properties, it is preferable that the volume resistivity value is 10 8 Ωcm or less. Of course, the first conductive layer 25 and the second conductive layer 26
There is no problem even if the resistance values of the conductive electrodes and the conductive support 24 are different, but it goes without saying that the electrical relationship between the conductive electrode described later, the member that contacts the other toner layer, and the conductive support 24 must meet the conditions described above. It is. A toner hopper 27 is arranged above the developing roller 23, and toner is stored therein. The toners used are mainly composed of resins such as epoxy, styrene, and phenol, mixed with colorants such as carbon black, rose bengal, and aniline blue, and additives such as silica and Teflon. It also consists of
A magnetic toner containing a magnetic material such as Fe 3 O 4 or CrO 2 may also be used. It is necessary to have insulating properties with a volume resistivity of 10 14 Ωcm or more so that the toner can be sufficiently charged and the charged charge can be retained after charging until development. Toner is Toner Hopper 2
7 onto the developing roller 23 and attached to one side of the toner hopper 27.
Both the charging electrode 28 and the second charging electrode 29 provided behind it are conductive and a bias voltage is applied thereto. The electrodes 28 and 29 also function to regulate the thickness of the toner layer on the developing roller 23. By the way, the bias voltage applied to the charging electrodes 28 and 29 is 200 V when the toner layer thickness is 0.05 mm, the volume resistivity of the toner is 10 14 to 10 16 Ωcm, and the circumferential speed of the developing roller is 200 mm/sec. Good charging results were obtained. Since the thickness of the toner layer 30 on the developing roller 23 is extremely thin, approximately 50 μm, there is a risk that the surface of the photoreceptor 20 may come into contact with the surface of the photoreceptor 20 in the developing section and be damaged. Further, in order to increase the contact area of the developing roller 23 with the photoreceptor 20 and increase the developing efficiency, the conductive coating layer of the developing roller 23 needs to be made elastic. The developing roller 23 is pressed against the photoreceptor 20 with a predetermined pressure to perform so-called pressure development. Therefore, the volume resistivity of the toner is referred to herein as the pressure contact resistance value.
本発明は、電子写真複写機ばかりでなく、請電
記録装置において誘電体上に形成される静電潜像
の現像装置にも全く同様に実施することが可能で
あり、現像剤を担持する現像剤供与体もエンドレ
ス表面を有するものであればベルト状のものであ
つてもよい。 The present invention can be implemented not only in an electrophotographic copying machine but also in a developing device for an electrostatic latent image formed on a dielectric material in a call recording device. The agent donor may also be in the form of a belt as long as it has an endless surface.
以上のように、本発明によれば、帯電電極によ
るトナー帯電を効率よく行うことが出来るばかり
でなく、帯電電極から現像部に流れる電流を阻止
することが出来るので現像時、静電潜像を乱すこ
とがなく、良好な現像を行うことが出来る。トナ
ーのみによる現像であるので、トナー濃度検知装
置等が不要であり、装置が簡単で且つ安価であ
る。 As described above, according to the present invention, not only can the toner be charged efficiently by the charging electrode, but also the current flowing from the charging electrode to the developing section can be blocked, so that the electrostatic latent image is not generated during development. Good development can be carried out without any disturbance. Since development is performed using only toner, there is no need for a toner concentration detection device, and the device is simple and inexpensive.
第１図及び第２図は従来の現像装置の断面図、
第３図は本発明の原理を説明するための図、第４
図は本発明の１実施例を示す現像装置の断面図で
ある。
１０……トナー供与体、１１，２４，４４……
導電性支持体、１２，２５，２６，３４，３５，
４２，５４……導電層、１３，３０……トナー
層、１４，１５，２８，２９，３７，４５，５９
……帯電電極、１６……潜像担持体、２０，３
１，３９……感光体（感光体ドラム）、２３，３
２，４１，５７……現像ローラー。
Figures 1 and 2 are cross-sectional views of a conventional developing device;
Figure 3 is a diagram for explaining the principle of the present invention, Figure 4 is a diagram for explaining the principle of the present invention.
The figure is a sectional view of a developing device showing one embodiment of the present invention. 10... Toner donor, 11, 24, 44...
conductive support, 12, 25, 26, 34, 35,
42, 54... Conductive layer, 13, 30... Toner layer, 14, 15, 28, 29, 37, 45, 59
...Charging electrode, 16...Latent image carrier, 20,3
1,39...Photoreceptor (photoreceptor drum), 23,3
2, 41, 57...Developing roller.
Claims (1)
持して移動するエンドレスな導電性表面を有する
現像剤供与部材と、該現像剤供与部材上の現像剤
を所定極性に帯電させる同極性の互に異なるバイ
アス電圧の印加された複数個の帯電電極とを有
し、該帯電電極から現像剤及び上記現像剤供与部
材の導電性表面を介して接地までの電気抵抗が、
現像剤を介しての各帯電電極間の電気抵抗よりも
小であることを特徴とする静電潜像の現像装置。 ２ 特許請求の範囲第１項記載の装置において、
導電性表面は少なくとも１層以上の導電性弾性体
であることを特徴とする静電潜像の現像装置。[Scope of Claims] 1. A developer supplying member having an endless conductive surface that carries a one-component developer consisting only of toner on its surface, and charging the developer on the developer supplying member to a predetermined polarity. a plurality of charging electrodes to which mutually different bias voltages of the same polarity are applied, and the electrical resistance from the charging electrodes to ground through the developer and the conductive surface of the developer donor member is
An electrostatic latent image developing device characterized in that the electrical resistance is smaller than the electrical resistance between each charging electrode via the developer. 2. In the device according to claim 1,
An electrostatic latent image developing device characterized in that the conductive surface is made of at least one layer of conductive elastic material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2248178A JPS54115245A (en) | 1978-02-28 | 1978-02-28 | Developing device of electrostatic latent images |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2248178A JPS54115245A (en) | 1978-02-28 | 1978-02-28 | Developing device of electrostatic latent images |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS54115245A JPS54115245A (en) | 1979-09-07 |
| JPS623949B2 true JPS623949B2 (en) | 1987-01-28 |
Family
ID=12083900
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2248178A Granted JPS54115245A (en) | 1978-02-28 | 1978-02-28 | Developing device of electrostatic latent images |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS54115245A (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5669669A (en) * | 1979-11-13 | 1981-06-11 | Toshiba Corp | One component developing apparatus |
| JPS56110964A (en) * | 1980-02-06 | 1981-09-02 | Toshiba Corp | Developing device |
| JP2542373B2 (en) * | 1986-02-19 | 1996-10-09 | 株式会社リコー | Toner carrier |
| JP2703922B2 (en) * | 1988-03-31 | 1998-01-26 | 株式会社東芝 | Developing device of pressure development system |
-
1978
- 1978-02-28 JP JP2248178A patent/JPS54115245A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS54115245A (en) | 1979-09-07 |
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