JPH0798534A - Brush electrostatic charging device - Google Patents
Brush electrostatic charging deviceInfo
- Publication number
- JPH0798534A JPH0798534A JP24189393A JP24189393A JPH0798534A JP H0798534 A JPH0798534 A JP H0798534A JP 24189393 A JP24189393 A JP 24189393A JP 24189393 A JP24189393 A JP 24189393A JP H0798534 A JPH0798534 A JP H0798534A
- Authority
- JP
- Japan
- Prior art keywords
- brush
- charging device
- voltage
- charging
- charged
- 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.)
- Granted
Links
Landscapes
- Electrostatic Charge, Transfer And Separation In Electrography (AREA)
- Brushes (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明はブラシ帯電装置、特に電
子写真プロセスを用いたプリンタやファクシミリ、複写
機等の画像形成装置のブラシ帯電装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a brush charging device, and more particularly to a brush charging device for an image forming apparatus such as a printer, a facsimile or a copying machine which uses an electrophotographic process.
【０００２】[0002]
【従来の技術】従来、この種の電子写真プロセスに用い
られるプロセスカートリッジにおいては、感光体等の像
担持体面の帯電を行う方法としてコロナ放電装置が広く
利用されている。コロナ放電装置は像担持体面を均一
に、かつ所定の電位に帯電を行う方法としては有効であ
る。しかし、コロナ放電を利用していることにより発生
するオゾンの問題がある。このコロナ帯電装置に対し
て、オゾンの発生を押さえることが可能な帯電部材を被
帯電体に接触させて帯電を行うブラシ帯電装置、ローラ
帯電装置等の接触帯電装置が有る。ブラシ帯電装置は絶
縁性基板とその上に電圧を印加する導電層、さらに低抵
抗の毛ブラシ繊維からなる多層構成をとり、ブラシをロ
ーラ状にしたブラシローラを回転して使うものと、平板
状のブラシを固定して使うものとがある。2. Description of the Related Art Conventionally, in a process cartridge used in this type of electrophotographic process, a corona discharge device has been widely used as a method for charging the surface of an image bearing member such as a photoconductor. The corona discharge device is effective as a method for uniformly charging the surface of the image bearing member to a predetermined potential. However, there is a problem of ozone generated by using corona discharge. With respect to this corona charging device, there is a contact charging device such as a brush charging device or a roller charging device that charges an object to be charged with a charging member capable of suppressing the generation of ozone. The brush charging device has a multilayer structure consisting of an insulating substrate, a conductive layer for applying a voltage thereon, and a low-resistance bristle brush fiber. There is one that fixes the brush of this and uses it.
【０００３】[0003]
【発明が解決しようとする課題】上述した従来のブラシ
帯電装置においては、直流電圧のみ印加しており、低温
低湿ではブラシの抵抗が高くなり、帯電電位が低くな
り、逆に高温高湿ではブラシの抵抗が低くなり帯電電位
が高くなり、環境により帯電電位の変動が大きいという
問題がある。また、特に低温低湿下ではストリーマ放電
を起こし、全面網点印字に白斑点が生じる問題もある。
さらにまた、感光体に接触しているため、感光体上のト
ナー、及び感光体の削れ粉が蓄積されること、感光体の
回転によりブラシの毛が回転方向の下流側へ次第に倒れ
ること等により帯電電位が低下したり、感光体の回転に
よりブラシの毛が抜けたり、飛び出したりすることによ
り、その毛が現像器やクリーナに入って悪影響を与えた
り、露光を遮り印字画像がその部分だけ白く抜ける現象
が生じるという問題点もある。なおまた、低抵抗の毛ブ
ラシからなるブラシ帯電装置により被帯電体である感光
体を帯電するとき、感光体にピンホールや打痕による傷
があると、そこに大電流が流れ込み、火花放電が発生す
る。その結果、電圧降下が生じることにより、ピンホー
ルや傷がブラシを通過するまで帯電不良を起こすとか、
ピンホールや傷が触れたブラシは火花放電により溶融す
るという欠点がある。In the above-mentioned conventional brush charging device, only a DC voltage is applied, and the resistance of the brush increases at low temperature and low humidity, and the charging potential decreases, and conversely at high temperature and high humidity. There is a problem that the resistance becomes low, the charging potential becomes high, and the charging potential greatly varies depending on the environment. Further, there is also a problem that streamer discharge occurs particularly under low temperature and low humidity, and white spots are generated on the whole halftone dot printing.
Furthermore, since it is in contact with the photoconductor, toner on the photoconductor and shavings of the photoconductor are accumulated, and the bristles of the brush gradually fall toward the downstream side in the rotation direction due to the rotation of the photoconductor. If the charging potential drops or the bristles of the brush come off or pop out due to the rotation of the photoconductor, the bristles may enter the developing device or cleaner and have an adverse effect, blocking the exposure and making the printed image white only in that part. There is also a problem that the phenomenon of falling out occurs. In addition, when charging the photoconductor, which is the member to be charged, with a brush charging device composed of a low-resistance bristle brush, if the photoconductor has scratches due to pinholes or dents, a large current will flow into it and spark discharge will occur. Occur. As a result, a voltage drop occurs, causing pinholes or scratches until the brush passes, or
Brushes that come into contact with pinholes or scratches have the drawback of melting due to spark discharge.
【０００４】[0004]
【課題を解決するための手段】本発明のブラシ帯電装置
は、被帯電体と、この被帯電体に接触する帯電部材に直
流電圧と交流電圧とを重畳して印加し、前記帯電部材を
合成樹脂材の繊維からなるブラシとする。また、この合
成樹脂材の繊維がアクリル系樹脂、ポリプロピレン、レ
ーヨン、ナイロン、ポリエステル、またはポリカーボネ
ートからなり、その電気抵抗が１０2 〜１０8 Ω・ｃ
ｍ、太さが１．５〜１５デニールである半導電性繊維で
あり、この半導電性繊維によるブラシの毛の長さが２ｍ
ｍ〜１０ｍｍ、ブラシの幅が３ｍｍ〜２０ｍｍ、ブラシ
の密度が５万〜５０万Ｆ／ｉｎｃｈ2 が適している。そ
して帯電部材を保持するプレートが導電性を有するステ
ンレス等の金属、または半導電性を有するエンジニアリ
ングプラスティック、有機材料であり、被帯電体にブラ
シの毛が０．５〜２ｍｍ接触の余裕がある状態で保持さ
れる。さらにまた、ブラシの毛が倒れないよう、前記プ
レートの感光体の回転方向の下流側に、エンジニアリン
グプラスティック、ＰＥＴフィルム、ウレタンシート、
または発泡体からなるガードを備えてもよく、プレート
自体が帯電部材をガードしてもよい。なおまた、ブラシ
の抜け毛や長い毛がブラシから離れたり、飛び出したり
しないようにガードにＰＥＴフィルム、またはウレタン
シートからなる、厚み０．１ｍｍ〜０．３ｍｍのシート
を貼付してもよい。SUMMARY OF THE INVENTION In a brush charging device of the present invention, a DC voltage and an AC voltage are superimposed and applied to an object to be charged and a charging member in contact with the object to be charged, and the charging member is synthesized. A brush made of resin material fibers. The fibers of the synthetic resin material are made of acrylic resin, polypropylene, rayon, nylon, polyester, or polycarbonate, and have an electric resistance of 10 2 to 10 8 Ω · c.
m, a semi-conductive fiber having a thickness of 1.5 to 15 denier, and the length of the bristles of the brush made of this semi-conductive fiber is 2 m.
m to 10 mm, a brush width of 3 mm to 20 mm, and a brush density of 50,000 to 500,000 F / inch2 are suitable. The plate holding the charging member is made of a conductive metal such as stainless steel, or a semiconductive engineering plastic or an organic material, and the bristles of the brush can contact the charged body by 0.5 to 2 mm. Held in. Furthermore, in order to prevent the brush bristles from falling, an engineering plastic, a PET film, a urethane sheet, on the downstream side of the plate in the rotation direction of the photoconductor,
Alternatively, a guard made of foam may be provided, and the plate itself may guard the charging member. In addition, a sheet having a thickness of 0.1 mm to 0.3 mm made of a PET film or a urethane sheet may be attached to the guard so that the bristles or long bristles of the brush do not come off or pop out of the brush.
【０００５】また感光体のピンホールや打痕によるブラ
シの溶融を防ぐために、前記ブラシとアルマイト処理に
より高抵抗の皮膜を有している被帯電体とを組み合わせ
るとよい。Further, in order to prevent the brush from melting due to pinholes or dents on the photosensitive member, it is preferable to combine the brush with a member to be charged having a high resistance film by anodizing.
【０００６】一方、上記の抵抗値範囲、太さの合成樹脂
材の繊維、およびブラシ密度のブラシ帯電装置におい
て、画像形成装置の解像度Ｒ（ｄｐｉ）でプロセススピ
ードＳ（ｍｍ／ｓ）のとき、帯電部材に周波数がＲ・Ｓ
／２５．４±１００Ｈｚでピーク電圧が０．９ｋＶ〜
１．３ｋＶをもつ交流成分に、絶対値が０．５ｋＶ〜
１．２ｋＶの直流電圧を重畳した電圧をかけると、網点
画像において、モアレ画像が発生せず、かつ低温低湿環
境においてストリーマ放電を抑制し、良好な画像を得ら
れる。On the other hand, in the brush charging device having the above-mentioned resistance value range, the thickness of the synthetic resin material fiber, and the brush density, at the process speed S (mm / s) at the resolution R (dpi) of the image forming apparatus, Frequency is R / S for charging member
/25.4±100Hz peak voltage 0.9kV ~
Absolute value is 0.5kV to AC component with 1.3kV
When a voltage with a DC voltage of 1.2 kV superimposed is applied, a moire image does not occur in a halftone dot image, and streamer discharge is suppressed in a low temperature and low humidity environment, and a good image can be obtained.
【０００７】[0007]
【実施例】次に、本発明について図面を参照して説明す
る。DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, the present invention will be described with reference to the drawings.
【０００８】図１は本発明の第１乃至第３の実施例によ
る電子写真カートリッジの縦断面図である。図１の電子
写真カートリッジは半導電性繊維から成るブラシ帯電装
置１に直流電圧と交流電圧との重畳電圧を印加して、静
電潜像担持体として従来から使用されているＯＰＣ、ま
たはＳｅ系等の感光体３を一様に帯電させ、感光体３の
表面に初期電位を与えるものである。感光体３はその
後、図示されていないレーザ、ＬＥＤ、または液晶等の
光源から、画像データの露光２を施して、静電潜像を形
成する。トナー７は、攪拌部材８により、導電性ないし
は絶縁性のスポンジ、アルミ等の材料から成る供給ロー
ラ５に導かれ、シリコンゴム、ウレタンゴム、ニトリル
ブチレンゴム、天然ゴム、またはスポンジの表面処理を
施した部材などのような可撓性材料から成るトナー担持
体４に導かれる。トナー担持体４に導かれたトナー７
は、ステンレス、リン青銅、または洋白等の金属のバネ
材から成る規制ブレード６によって規制されて、均一な
薄層に形成されると共に、摩擦によって帯電される。ト
ナー担持体４上に帯電した薄層のトナー７は、感光体３
に対向したときに、電界によって感光体３上の静電潜像
に付着し、現像が行われる。次に感光体３上のトナー画
像を、図示しない転写手段で用紙、ＯＨＰ用ファイルや
ハガキ等の記録媒体に転写し、図示しない定着手段でト
ナー画像を記録媒体に定着させて画像を得る。FIG. 1 is a vertical sectional view of an electrophotographic cartridge according to first to third embodiments of the present invention. The electrophotographic cartridge of FIG. 1 applies a superposed voltage of a DC voltage and an AC voltage to a brush charging device 1 made of semi-conductive fibers, so that the OPC or Se system conventionally used as an electrostatic latent image carrier is used. And the like to uniformly charge the photoconductor 3 and apply an initial potential to the surface of the photoconductor 3. The photoconductor 3 is then exposed to image data 2 from a light source such as a laser, an LED, or a liquid crystal (not shown) to form an electrostatic latent image. The toner 7 is guided by the stirring member 8 to the supply roller 5 made of a conductive or insulating sponge, aluminum or the like, and subjected to surface treatment of silicone rubber, urethane rubber, nitrile butylene rubber, natural rubber or sponge. It is guided to the toner carrier 4 made of a flexible material such as the above-mentioned member. Toner 7 guided to toner carrier 4
Is regulated by the regulation blade 6 made of a spring material made of metal such as stainless steel, phosphor bronze, or nickel silver, and is formed into a uniform thin layer, and is charged by friction. The thin layer of toner 7 charged on the toner carrier 4 is
When it faces, the toner is attached to the electrostatic latent image on the photoconductor 3 by the electric field and is developed. Next, the toner image on the photoconductor 3 is transferred to a recording medium such as a sheet of paper, an OHP file or a postcard by a transfer unit (not shown), and the toner image is fixed on the recording medium by a fixing unit (not shown) to obtain an image.
【０００９】図２は図１の電子写真カートリッジに用い
られる第１の実施例に係るブラシ帯電装置の縦断面図で
あり、ブラシ１ａと、プレート１ｂと、ガード１ｃで構
成されている。ブラシ１ａはアクリルの繊維からなって
おり、長さは５ｍｍ、幅５ｍｍ、繊維の太さは６．２デ
ニール、ブラシ密度が１０万Ｆ／ｉｎｃｈ2 であり、プ
レート１ｂにより保持されている。プレート１ｂは、導
電性を有するステンレス材からなっている。ガード１ｃ
はＡＢＳ樹脂により構成される。ブラシ１ａとプレート
１ｂとガード１ｃとで構成された第１の実施例では、感
光体３に対してブラシ１ａが１ｍｍ接触する状態で保持
した。FIG. 2 is a vertical sectional view of a brush charging device according to the first embodiment used in the electrophotographic cartridge of FIG. 1, which is composed of a brush 1a, a plate 1b and a guard 1c. The brush 1a is made of acrylic fiber, has a length of 5 mm, a width of 5 mm, a fiber thickness of 6.2 denier, a brush density of 100,000 F / inch 2 , and is held by the plate 1b. The plate 1b is made of a conductive stainless material. Guard 1c
Is made of ABS resin. In the first embodiment including the brush 1a, the plate 1b, and the guard 1c, the brush 1a was held in a state of being in contact with the photoconductor 3 by 1 mm.
【００１０】以上の構成でブラシ１ａの繊維の抵抗が１
０3 Ω・ｃｍと１０5 Ω・ｃｍとの２種類のブラシを用
い、それぞれでプレート１ｂには、周波数４５０Ｈｚを
もつ交流成分に直流成分Ｖｄｃ＝−７００Ｖを重畳した
電圧をかけ、交流成分のｐｅａｋ ｔｏ ｐｅａｋ電圧
Ｖｐｐを変えて、解像度２４０ｄｐｉ、プロセススピー
ド３３ｍｍ／ｓのプリンタ装置として、面積率１２．５
％の網点画像を印字し、印字品質を主観評価した一例の
結果を表１に示す。With the above construction, the resistance of the fiber of the brush 1a is 1
Two types of brushes of 0 3 Ω · cm and 10 5 Ω · cm are used, and a voltage in which a DC component Vdc = −700 V is superimposed on an AC component having a frequency of 450 Hz is applied to each of the plates 1 b to apply the AC component By changing the peak to peak voltage Vpp, the area ratio is 12.5 as a printer device having a resolution of 240 dpi and a process speed of 33 mm / s.
Table 1 shows the results of an example in which a dot image of 100% was printed and the print quality was subjectively evaluated.
【００１１】 [0011]
【００１２】図３は図１の電子写真カートリッジに用い
られる第２の実施例に係るブラシ帯電装置の縦断面図で
ある。図３の実施例はブラシ１ａと、帯電部材であるブ
ラシをおさえる機構を有したプレート１ｄとで構成され
ている。ブラシ１ａは図２の場合と同じで、アクリルの
繊維からなっており、長さは５ｍｍ、幅５ｍｍ、繊維の
太さは６．２デニール、ブラシ密度が１０万Ｆ／ｉｎｃ
ｈ2 であり、プレート１ｄにより保持されている。プレ
ート１ｄは導電性を有するステンレス材からなってい
る。ブラシ１ａとプレート１ｄで構成された第２の実施
例の帯電装置においても、感光体３に対して、ブラシ１
ａが１ｍｍ接触する状態で保持した。また図２の場合と
同様にプレート１ｄには周波数４５０Ｈｚ、Ｖｐｐ＝
１．２ｋＶの交流成分に直流成分Ｖｄｃ＝−７００Ｖを
重畳した電圧をかけ、解像度２４０ｄｐｉ、プロセスス
ピード３３ｍｍ／ｓのプリンタ装置にて、印字したとこ
ろ良好な画像が得られ、ブラシの毛の倒れを防ぐことが
できた。FIG. 3 is a vertical sectional view of a brush charging device according to a second embodiment used in the electrophotographic cartridge of FIG. The embodiment of FIG. 3 is composed of a brush 1a and a plate 1d having a mechanism for holding the brush as a charging member. The brush 1a is the same as in the case of FIG. 2, is made of acrylic fiber, and has a length of 5 mm, a width of 5 mm, a fiber thickness of 6.2 denier, and a brush density of 100,000 F / inc.
h 2 and is held by the plate 1d. The plate 1d is made of a conductive stainless material. Also in the charging device of the second embodiment including the brush 1a and the plate 1d, the brush 1
It was held in a state in which a was in contact with 1 mm. As in the case of FIG. 2, the plate 1d has a frequency of 450 Hz and Vpp =
A voltage in which a direct current component Vdc = -700V is superimposed on an alternating current component of 1.2 kV is applied and a good image is obtained by printing with a printer device having a resolution of 240 dpi and a process speed of 33 mm / s, and the bristles of a brush are prevented from collapsing. I was able to prevent it.
【００１３】図４は図１の電子写真カートリッジに用い
られる第３の実施例に係るブラシ帯電装置の縦断面図で
ある。図４の実施例はブラシ１ａと、プレート１ｂと、
ガード１ｃと、フィルム１ｅとで構成されている。ブラ
シ１ａは図２の場合と同じで、アクリルの繊維からなっ
ており、長さは５ｍｍ、幅５ｍｍ、繊維の太さは６．２
デニール、ブラシ密度が１０万Ｆ／ｉｎｃｈ2 であり、
プレート１ｂにより保持されている。プレート１ｂは、
導電性を有するステンレス材からなっている。ガード１
ｃも図２の場合の同じくＡＢＳ樹脂を用いた。フィルム
１ｄはウレタンシートからなっている。ブラシ１ａとプ
レート１ｂとフィルム１ｄで構成された第３の実施例の
帯電装置は感光体３に対して、ブラシ１ａが１ｍｍ接触
する状態で保持した。以上の構成のプレート１ｂには周
波数４５０Ｈｚ、Ｖｐｐ＝１．２ｋＶの交流成分に直流
成分Ｖｄｃ＝−７００Ｖを重畳した電圧をかけ、解像度
２４０ｄｐｉ、プロセススピード３３ｍｍ／ｓのプリン
タ装置として、フィルム１ｄの厚みを変えて、印字した
ところ、厚みが０．１〜０．３ｍｍのとき、ブラシ１ａ
から感光体の回転によって抜けたり、飛び出す毛を防ぎ
良好な画像を得られた。FIG. 4 is a vertical sectional view of a brush charging device according to a third embodiment used in the electrophotographic cartridge of FIG. In the embodiment of FIG. 4, the brush 1a, the plate 1b,
It is composed of a guard 1c and a film 1e. The brush 1a is the same as in the case of FIG. 2, and is made of acrylic fiber, and has a length of 5 mm, a width of 5 mm, and a fiber thickness of 6.2.
Denier and brush density is 100,000F / inch2,
It is held by the plate 1b. The plate 1b is
It is made of conductive stainless steel. Guard 1
For c, the ABS resin was used as in the case of FIG. The film 1d is made of a urethane sheet. The charging device of the third embodiment, which is composed of the brush 1a, the plate 1b, and the film 1d, held the photosensitive member 3 in a state where the brush 1a was in contact with the photosensitive member 3 by 1 mm. The plate 1b having the above configuration is applied with a voltage in which a DC component Vdc = -700V is superimposed on an AC component having a frequency of 450 Hz and Vpp = 1.2 kV, and the thickness of the film 1d is used as a printer device having a resolution of 240 dpi and a process speed of 33 mm / s. When the thickness is 0.1 to 0.3 mm, the brush 1a is printed.
From this, it was possible to prevent hairs from coming off or popping out by the rotation of the photoconductor and obtain a good image.
【００１４】図５は図１の電子写真カートリッジの感光
体３の改良も含む第４の実施例に係るブラシ帯電装置の
縦断面図である。図５の実施例のブラシ部は図３の実施
例と同じで、ブラシ１ａと、プレート１ｄで構成されて
いる。そして図１の感光体３の代えてアルマイト処理を
施し高抵抗皮膜３ｃを有するアルミ素管３ｂと感光層３
ａからなる感光体を有して、この感光体に対して、ブラ
シ１ａが１ｍｍ接触する状態で保持されている。以上の
構成のプレート１ｂには周波数４５０Ｈｚ、Ｖｐｐ＝
１．２ｋＶの交流成分に直流成分Ｖｄｃ＝−７００Ｖを
重畳した電圧をかけ、解像度２４０ｄｐｉ、プロセスス
ピード３３ｍｍ／ｓのプリンタ装置として、印字したと
ころ、感光体の打痕やピンホールによるブラシの溶融を
なくすことができた。FIG. 5 is a vertical cross-sectional view of a brush charging device according to a fourth embodiment including an improvement of the photoconductor 3 of the electrophotographic cartridge of FIG. The brush portion of the embodiment of FIG. 5 is the same as that of the embodiment of FIG. 3, and is composed of a brush 1a and a plate 1d. Then, instead of the photoconductor 3 in FIG. 1, an aluminum tube 3b having a high resistance film 3c which has been subjected to an alumite treatment and a photoconductive layer 3 are provided.
The photosensitive member is made of a, and the brush 1a is held in a state of being in contact with the photosensitive member by 1 mm. The plate 1b having the above configuration has a frequency of 450 Hz and Vpp =
When a voltage in which a direct current component Vdc = -700V is superposed on a 1.2 kV AC component is applied and printing is performed as a printer device having a resolution of 240 dpi and a process speed of 33 mm / s, printing is performed, and a brush mark due to a dent or a pinhole on the photoconductor melts. I was able to lose it.
【００１５】[0015]
【発明の効果】以上説明したように本発明、ブラシとプ
レートで構成されたブラシ帯電装置、若しくはこれにガ
ードを設けた帯電装置を、感光体に接触させた状態で保
持し、プレートにはＲ・Ｓ／２５．４±１００Ｈｚ、Ｖ
ｐｐが０．９〜１．３ｋＶをもつ交流電圧に絶対値が
０．５〜１．２ｋＶの直流電圧を重畳した電圧をかける
ことによって、特に網点画像においてモアレ画像や白い
縦スジおよび定温低湿下でのストリーマ放電による薄斑
点が発生すること無く、良好な画像を得られる効果があ
る。また、ガードやガードにフィルムを付けることによ
って感光体の回転による毛の倒れや抜け毛、飛び出し毛
を防ぎ、安定した帯電を行うことができ、また、素管に
高抵抗皮膜を有する感光体と組み合わせることにより、
ブラシの溶融を防ぐことができるという効果がある。As described above, according to the present invention, the brush charging device composed of the brush and the plate, or the charging device having the guard attached thereto is held in contact with the photoconductor, and the plate is provided with・ S / 25.4 ± 100Hz, V
By applying a voltage in which a DC voltage having an absolute value of 0.5 to 1.2 kV is superimposed on an AC voltage having a pp of 0.9 to 1.3 kV, a moire image, white vertical stripes, and constant temperature and low humidity are formed especially in a halftone dot image. There is an effect that a good image can be obtained without generating thin spots due to streamer discharge below. Also, by attaching a film to the guard or the guard, it is possible to prevent the hair from falling, hair loss, and jumping hair due to the rotation of the photoconductor, and to perform stable charging, and combine it with a photoconductor that has a high resistance film on the tube. By
This has the effect of preventing the brush from melting.
【図１】本発明の第１乃至第３の実施例による電子写真
カートリッジの縦断面図である。FIG. 1 is a vertical sectional view of an electrophotographic cartridge according to first to third embodiments of the present invention.
【図２】本発明の第１の実施例のブラシ帯電装置の縦断
面図である。FIG. 2 is a vertical cross-sectional view of the brush charging device according to the first embodiment of the present invention.
【図３】本発明の第２の実施例のブラシ帯電装置の縦断
面図である。FIG. 3 is a vertical sectional view of a brush charging device according to a second embodiment of the present invention.
【図４】本発明の第３の実施例のブラシ帯電装置の縦断
面図である。FIG. 4 is a vertical sectional view of a brush charging device according to a third embodiment of the present invention.
【図５】本発明の第４の実施例のブラシ帯電装置の縦断
面図である。FIG. 5 is a vertical sectional view of a brush charging device according to a fourth embodiment of the present invention.
１ ブラシ帯電装置 １ａ ブラシ １ｂ，１ｄ プレート １ｃ ガード １ｅ フィルム ２ 露光 ３ 感光体 ３ａ 感光層 ３ｂ アルミ素管 ３ｃ 高抵抗皮膜 ４ トナー担持体 ５ 供給ローラ ６ 規制ブレード ７ トナー ８ 攪拌部材 ９ トナーホッパ １０ クリーナ １１ シャッタ DESCRIPTION OF SYMBOLS 1 Brush charging device 1a Brush 1b, 1d Plate 1c Guard 1e Film 2 Exposure 3 Photoconductor 3a Photosensitive layer 3b Aluminum tube 3c High resistance film 4 Toner carrier 5 Supply roller 6 Regulation blade 7 Toner 8 Stirring member 9 Toner hopper 10 Cleaner 11 Shutter
Claims (5)
圧を印加した帯電部材を接触して被帯電体を帯電させる
ブラシ帯電装置において、帯電部材に印加する電圧が直
流電圧に交流電圧を重畳した重畳電圧であり、帯電部材
が合成樹脂材の繊維からなるブラシであることを特徴と
するブラシ帯電装置。1. In a brush charging device for charging a charged member by applying a voltage to the charged member used in an electrophotographic process, the voltage applied to the charging member is a DC voltage superimposed with an AC voltage. A brush charging device having a superimposed voltage, wherein the charging member is a brush made of fibers of a synthetic resin material.
リル系樹脂、ポリプロピレン、レーヨン、ナイロン、ポ
リエステル、およびポリカーボネートのうちの少なくと
も一つからなり、その電気抵抗が１０2 〜１０8 Ω・ｃ
ｍ、太さが１．５〜１５デニールの半導電性繊維で、ブ
ラシが毛の長さが２〜１０ｍｍ、ブラシの幅が３〜２０
ｍｍ、ブラシの密度が５万〜５０万Ｆ／ｉｎｃｈ2 であ
るブラシであることを特徴とする請求項１記載のブラシ
帯電装置。2. The fiber of the synthetic resin material according to claim 1, which is made of at least one of acrylic resin, polypropylene, rayon, nylon, polyester, and polycarbonate, and has an electric resistance of 10 2 to 10 8 Ω. c
m, thickness is 1.5 to 15 denier, semi-conductive fiber, brush length is 2 to 10 mm, brush width is 3 to 20
2. The brush charging device according to claim 1, wherein the brush charging device has a size of mm and a brush density of 50,000 to 500,000 F / inch 2 .
下流側に、エンジニアリングプラスティック、ＰＥＴフ
ィルム、およびウレタンシートのうちの少なくとも一つ
からなるブラシ倒れ防止のガードを有することを特徴と
する請求項１記載のブラシ帯電装置。3. A brush collapse prevention guard made of at least one of an engineering plastic, a PET film, and a urethane sheet is provided on the downstream side of the brush as the charging member according to claim 1. Item 2. The brush charging device according to item 1.
ーム素管にアルマイト処理を施した高抵抗皮膜を有す被
帯電体であることを特徴とする請求項１記載のブラシ帯
電装置。4. The brush charging device according to claim 1, wherein the member to be charged according to claim 1 is a member to be charged having a high resistance film obtained by subjecting an aluminum tube to an alumite treatment.
電装置において、電子写真プロセスが解像度Ｒ（ｄｐ
ｉ）、プロセススピードＳ（ｍｍ／ｓ）であるとき、前
記重畳電圧が絶対値０．５〜１．２ｋＶの直流電圧に周
波数Ｒ・Ｓ／２５．４±１００Ｈｚ、ピーク電圧０．９
〜１．３ｋＶの交流電圧を重畳した重畳電圧であること
を特徴とするブラシ帯電装置。5. The brush charging device according to claim 1, wherein the electrophotographic process has a resolution R (dp).
i), when the process speed is S (mm / s), the superimposed voltage has a frequency R · S / 25.4 ± 100 Hz and a peak voltage of 0.9 at a DC voltage having an absolute value of 0.5 to 1.2 kV.
A brush charging device, which is a superimposed voltage obtained by superimposing an AC voltage of up to 1.3 kV.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP24189393A JP3146788B2 (en) | 1993-09-29 | 1993-09-29 | Brush charging device |
| US08/291,883 US5479244A (en) | 1993-09-29 | 1994-08-17 | Charger for charging an image holding member included in an image forming apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP24189393A JP3146788B2 (en) | 1993-09-29 | 1993-09-29 | Brush charging device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0798534A true JPH0798534A (en) | 1995-04-11 |
| JP3146788B2 JP3146788B2 (en) | 2001-03-19 |
Family
ID=17081124
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP24189393A Expired - Fee Related JP3146788B2 (en) | 1993-09-29 | 1993-09-29 | Brush charging device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3146788B2 (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5576807A (en) * | 1994-11-07 | 1996-11-19 | Minolta Co., Ltd. | Image forming apparatus having a contact type charging device |
| US6041197A (en) * | 1998-01-30 | 2000-03-21 | Nec Corporation | Charging device |
| US6067426A (en) * | 1998-04-14 | 2000-05-23 | Nec Corporation | Brush type charger |
| US6400916B1 (en) | 1998-11-30 | 2002-06-04 | Canon Kabushiki Kaisha | Process cartridge and electrophotographic apparatus |
| US7295796B1 (en) * | 2002-08-30 | 2007-11-13 | Ricoh Company, Ltd. | Image forming apparatus having a temporary toner holding device and a toner collecting device |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI593906B (en) * | 2015-05-18 | 2017-08-01 | guan-long Lin | Embedded / reserved perforation device and the tube with this embedded perforation device |
-
1993
- 1993-09-29 JP JP24189393A patent/JP3146788B2/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5576807A (en) * | 1994-11-07 | 1996-11-19 | Minolta Co., Ltd. | Image forming apparatus having a contact type charging device |
| US6041197A (en) * | 1998-01-30 | 2000-03-21 | Nec Corporation | Charging device |
| US6067426A (en) * | 1998-04-14 | 2000-05-23 | Nec Corporation | Brush type charger |
| US6400916B1 (en) | 1998-11-30 | 2002-06-04 | Canon Kabushiki Kaisha | Process cartridge and electrophotographic apparatus |
| US7295796B1 (en) * | 2002-08-30 | 2007-11-13 | Ricoh Company, Ltd. | Image forming apparatus having a temporary toner holding device and a toner collecting device |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3146788B2 (en) | 2001-03-19 |
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