JPS584101Y2 - liquid developer - Google Patents

liquid developer

Info

Publication number
JPS584101Y2
JPS584101Y2 JP2559078U JP2559078U JPS584101Y2 JP S584101 Y2 JPS584101 Y2 JP S584101Y2 JP 2559078 U JP2559078 U JP 2559078U JP 2559078 U JP2559078 U JP 2559078U JP S584101 Y2 JPS584101 Y2 JP S584101Y2
Authority
JP
Japan
Prior art keywords
electrode
developing
aluminum
toner
developing electrode
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
Application number
JP2559078U
Other languages
Japanese (ja)
Other versions
JPS54130433U (en
Inventor
安部大典
加藤良治
神津真
Original Assignee
株式会社リコー
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 株式会社リコー filed Critical 株式会社リコー
Priority to JP2559078U priority Critical patent/JPS584101Y2/en
Publication of JPS54130433U publication Critical patent/JPS54130433U/ja
Application granted granted Critical
Publication of JPS584101Y2 publication Critical patent/JPS584101Y2/en
Expired legal-status Critical Current

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  • Developing For Electrophotography (AREA)
  • Wet Developing In Electrophotography (AREA)

Description

【考案の詳細な説明】 本考案は、湿式電子写真の現像器に関する。[Detailed explanation of the idea] The present invention relates to a developing device for wet electrophotography.

湿式電子写真法による普通紙複写機においては、感光体
としてセレンを蒸着したアルミニウム製ドラムがゴ般に
使用されている。
In plain paper copying machines using wet electrophotography, an aluminum drum coated with selenium is commonly used as a photoreceptor.

このドラムは全面にセレンの蒸着被膜が施こされておら
ず、通常その両端部はアルミの地肌が露出していて、ド
ラム周辺部材、特にスクイズローラ等の間隔を−fに保
つため、ここにローラ等を押しつげろようになっている
This drum is not coated with a selenium vapor-deposited coating over its entire surface, and the aluminum surface is usually exposed at both ends. It is designed to push down rollers, etc.

このドラム両端部のアルミ地肌部は当然のことながら接
地電位となっているから、他より電位の高い部分が像形
成部となる通常の現像法においては、アルミ地肌部にト
ナーの付着はなく、現像工程において−1はない。
Naturally, the aluminum surface portions at both ends of the drum are at ground potential, so in a normal development method where the image forming area is a portion with a higher potential than the other portions, toner does not adhere to the aluminum surface portion. There is no -1 in the developing process.

しかしながら、コンピュータなどの端末機としての役割
りを担うような装置、つまり、像露光を陰極線管あるい
はオプティカル・ファイバー管ニより行なう形式の装置
では、反転現像を行っている。
However, in an apparatus that functions as a terminal such as a computer, that is, an apparatus in which image exposure is performed using a cathode ray tube or an optical fiber tube, reversal development is performed.

すなわち、帯電されたセレン感光体層にネガ像露光を行
なって、帯電極性と同一極性のトナーにより現像すると
、露光により電位の落ちた部分にトナーが付着して、ポ
ジ像が得られる。
That is, when a charged selenium photoreceptor layer is subjected to negative image exposure and developed with toner having the same polarity as the charging polarity, the toner adheres to the portions where the potential has dropped due to exposure, and a positive image is obtained.

液体現像器を使用すると、第1図に示すように、感光体
面Aに均一に現像液を供給するために、帯電々極1は感
光体部分より巾広くする必要があり、電極の両端部はア
ルミ地肌部分Bにまで及んでしまい、接地電位となって
いるこの地肌部分Bもトナーを引きつけてしまう。
When a liquid developer is used, as shown in FIG. 1, in order to uniformly supply the developer to the photoreceptor surface A, the charging electrode 1 needs to be wider than the photoreceptor part, and both ends of the electrode are This extends to the aluminum background portion B, and this background portion B, which is at ground potential, also attracts toner.

この結果、アルミ地肌部Bがトナーで汚れ、さらにこの
部分に接触する上述のL/シスト・ローラあるいはピッ
クオフベルト等を介して、転写紙を汚染することとなる
As a result, the aluminum background portion B is stained with toner, and the transfer paper is further contaminated via the above-mentioned L/sist roller or pick-off belt that comes into contact with this portion.

本考案は、上記の問題点に鑑み、アルミ地肌部に現像電
極のバイアス効果が及ばないようにして、トナー吸引作
用をなくし、もって高品質の画像を得ることを目的とし
たものである。
In view of the above-mentioned problems, the present invention aims to prevent the bias effect of the developing electrode from reaching the aluminum background portion, eliminate the toner suction effect, and thereby obtain high-quality images.

以下、図示の実施例により本考案を説明する。The present invention will be explained below with reference to illustrated embodiments.

第2図で示す第1の実施例は、現像電極1と同一平面を
なす側縁電極2を、絶縁体3を介して現像電極1と電気
的に絶縁し、該側縁電極2をアースして、アルミ地肌部
Bと同電位としたものである。
In the first embodiment shown in FIG. 2, a side edge electrode 2 that is on the same plane as the developing electrode 1 is electrically insulated from the developing electrode 1 via an insulator 3, and the side edge electrode 2 is grounded. Therefore, the potential is the same as that of the aluminum background portion B.

これによれば、側縁電極2は単に現像液を均一に流すた
めの機能を持つのみとなるから、現像電極1に感光体面
Aの帯電々位と同じか、やや低いバイアス電圧をかげて
も、側縁部には不必要なバイアスはかからず、アルミ地
肌部Bにトナーが付着することが阻止される。
According to this, the side edge electrode 2 merely has the function of uniformly flowing the developer, so even if a bias voltage that is equal to or slightly lower than the charged level of the photoreceptor surface A is applied to the developing electrode 1, , unnecessary bias is not applied to the side edge portions, and toner is prevented from adhering to the aluminum background portion B.

第3図は別0実施例を示している。FIG. 3 shows another embodiment.

これは、現像電極1に十分な巾を持たせ、アルミ地肌部
BE対向する両側部の上方に、絶縁体3′を介してバイ
アス幼果を遮蔽する接地電極4で覆ったものである。
In this case, the developing electrode 1 has a sufficient width and is covered with ground electrodes 4 above both sides facing the aluminum background part BE via an insulator 3' to shield the bias seedlings.

この実施例は、第2図のものが側縁部2と現像電極1と
を絶縁体を介して一体としたため構造がMで、保持が困
難であつヒのを改良したものである。
This embodiment is an improvement over the structure shown in FIG. 2, in which the side edge portion 2 and the developing electrode 1 are integrated through an insulator, so that the structure is M, which makes it difficult to hold.

しかしながら、現像電極1の両側に、第2,3図のよう
な接地電極2,4を設けると、アルミ地肌部Bにはトナ
ーが付着しなくなるが、接地電極2.4とバイアス電極
との間に高い電界がかかるため、接地電極4にトナーが
付着して汚れることとなる。
However, if the ground electrodes 2 and 4 as shown in FIGS. 2 and 3 are provided on both sides of the developing electrode 1, toner will not adhere to the aluminum background part B, but between the ground electrode 2 and the bias electrode. Since a high electric field is applied to the ground electrode 4, toner adheres to the ground electrode 4 and makes it dirty.

第4図イ9口で示した実施例は、第2゜3図の電極2,
4に、バイアス電圧より低い電圧をかけるようにしたも
ので、こし実施例によれば上述した問題点が解決される
The embodiment shown in FIG.
4, a voltage lower than the bias voltage is applied, and according to this embodiment, the above-mentioned problems can be solved.

第5図に示したものは、さらに発展させて、現像電極1
の側縁部1を絶縁材としたものである。
The one shown in FIG. 5 has been further developed, and the developing electrode 1
The side edge portion 1 of is made of an insulating material.

なお、図中符号8は現像剤タンク、9はポンプをそれぞ
れ示しである。
In the figure, reference numeral 8 indicates a developer tank, and 9 indicates a pump.

以上の如く、本考案によれば、ドラム両端のアルミ地肌
部に現像電極のバイアス電圧が作用しないようにしたの
で、湿式現像法により反転現像像を得る装置のドラムの
汚れは完全に防止されるのである。
As described above, according to the present invention, since the bias voltage of the developing electrode does not act on the aluminum background portions at both ends of the drum, it is possible to completely prevent the drum of an apparatus for obtaining a reverse developed image by a wet development method from becoming dirty. It is.

しかも、アルミ地肌部にトナーが付着しないことは、こ
れに接するドラム周辺の装置汚染をも同時に解消し、ひ
いては高品質の画像を得ることを軒能となす優れた効果
を奏するものである。
Moreover, the fact that toner does not adhere to the aluminum surface also eliminates contamination of the equipment around the drum that comes in contact with it, which has the excellent effect of making it possible to obtain high-quality images.

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

第1図は、液体現像器の従来例を示す説明図、第2図乃
至第5図は、本考案の実施例をそれぞれ示す説明図であ
る。 A・・・感光体面、B・・・アルミ地肌部、1・・・現
像電極、2,4・・・接地電極、3.ご・・・絶縁体。
FIG. 1 is an explanatory view showing a conventional example of a liquid developing device, and FIGS. 2 to 5 are explanatory views showing embodiments of the present invention. A: Photoreceptor surface, B: Aluminum background portion, 1: Developing electrode, 2, 4: Ground electrode, 3. Please...insulator.

Claims (1)

【実用新案登録請求の範囲】[Scope of utility model registration request] 感光体ドラムに対向配設した現像電極を有する湿式電子
写真法による転写式装置において、上記現像電極におけ
る、上記感光体ドラムの金属露出部に対向する部分に、
バイアス電圧効果を遮蔽する手段を、直接もしくは間接
に具備したことを特徴とする液体現像器。
In a wet electrophotographic transfer device having a developing electrode disposed opposite to a photoreceptor drum, a portion of the developing electrode facing the exposed metal portion of the photoreceptor drum,
A liquid developing device characterized in that it is provided directly or indirectly with means for shielding bias voltage effects.
JP2559078U 1978-03-02 1978-03-02 liquid developer Expired JPS584101Y2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2559078U JPS584101Y2 (en) 1978-03-02 1978-03-02 liquid developer

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2559078U JPS584101Y2 (en) 1978-03-02 1978-03-02 liquid developer

Publications (2)

Publication Number Publication Date
JPS54130433U JPS54130433U (en) 1979-09-10
JPS584101Y2 true JPS584101Y2 (en) 1983-01-24

Family

ID=28866242

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2559078U Expired JPS584101Y2 (en) 1978-03-02 1978-03-02 liquid developer

Country Status (1)

Country Link
JP (1) JPS584101Y2 (en)

Also Published As

Publication number Publication date
JPS54130433U (en) 1979-09-10

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