JPH04303860A - Electrifying roll - Google Patents
Electrifying rollInfo
- Publication number
- JPH04303860A JPH04303860A JP9306891A JP9306891A JPH04303860A JP H04303860 A JPH04303860 A JP H04303860A JP 9306891 A JP9306891 A JP 9306891A JP 9306891 A JP9306891 A JP 9306891A JP H04303860 A JPH04303860 A JP H04303860A
- Authority
- JP
- Japan
- Prior art keywords
- layer
- charging
- charging roll
- conductive elastic
- photosensitive drum
- 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
- 239000011159 matrix material Substances 0.000 claims abstract description 6
- 239000002245 particle Substances 0.000 claims description 21
- 239000000463 material Substances 0.000 claims description 14
- 230000003746 surface roughness Effects 0.000 claims description 6
- 229920001971 elastomer Polymers 0.000 abstract description 7
- 239000002861 polymer material Substances 0.000 abstract description 2
- 239000000806 elastomer Substances 0.000 abstract 1
- 239000002184 metal Substances 0.000 description 12
- 229910052751 metal Inorganic materials 0.000 description 12
- 239000000203 mixture Substances 0.000 description 10
- 238000000034 method Methods 0.000 description 8
- 239000004677 Nylon Substances 0.000 description 6
- 229920001778 nylon Polymers 0.000 description 6
- 230000000052 comparative effect Effects 0.000 description 4
- 238000012546 transfer Methods 0.000 description 4
- 238000000465 moulding Methods 0.000 description 3
- 230000002093 peripheral effect Effects 0.000 description 3
- 229920000636 poly(norbornene) polymer Polymers 0.000 description 3
- 239000000843 powder Substances 0.000 description 3
- 239000002994 raw material Substances 0.000 description 3
- SPBDXSGPUHCETR-JFUDTMANSA-N 8883yp2r6d Chemical compound O1[C@@H](C)[C@H](O)[C@@H](OC)C[C@@H]1O[C@@H]1[C@@H](OC)C[C@H](O[C@@H]2C(=C/C[C@@H]3C[C@@H](C[C@@]4(O[C@@H]([C@@H](C)CC4)C(C)C)O3)OC(=O)[C@@H]3C=C(C)[C@@H](O)[C@H]4OC\C([C@@]34O)=C/C=C/[C@@H]2C)/C)O[C@H]1C.C1C[C@H](C)[C@@H]([C@@H](C)CC)O[C@@]21O[C@H](C\C=C(C)\[C@@H](O[C@@H]1O[C@@H](C)[C@H](O[C@@H]3O[C@@H](C)[C@H](O)[C@@H](OC)C3)[C@@H](OC)C1)[C@@H](C)\C=C\C=C/1[C@]3([C@H](C(=O)O4)C=C(C)[C@@H](O)[C@H]3OC\1)O)C[C@H]4C2 SPBDXSGPUHCETR-JFUDTMANSA-N 0.000 description 2
- 229920000181 Ethylene propylene rubber Polymers 0.000 description 2
- 239000000654 additive Substances 0.000 description 2
- 239000006229 carbon black Substances 0.000 description 2
- 238000000576 coating method Methods 0.000 description 2
- 238000007796 conventional method Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 230000003287 optical effect Effects 0.000 description 2
- 230000000737 periodic effect Effects 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 229920002379 silicone rubber Polymers 0.000 description 2
- 239000004945 silicone rubber Substances 0.000 description 2
- 229920003002 synthetic resin Polymers 0.000 description 2
- 239000000057 synthetic resin Substances 0.000 description 2
- 229920002803 thermoplastic polyurethane Polymers 0.000 description 2
- 238000004073 vulcanization Methods 0.000 description 2
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 1
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 1
- 229920000459 Nitrile rubber Polymers 0.000 description 1
- CBENFWSGALASAD-UHFFFAOYSA-N Ozone Chemical compound [O-][O+]=O CBENFWSGALASAD-UHFFFAOYSA-N 0.000 description 1
- 206010047571 Visual impairment Diseases 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 125000003368 amide group Chemical group 0.000 description 1
- 239000012752 auxiliary agent Substances 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 238000001723 curing Methods 0.000 description 1
- 239000003822 epoxy resin Substances 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 229920001084 poly(chloroprene) Polymers 0.000 description 1
- 229920000647 polyepoxide Polymers 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 238000001694 spray drying Methods 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- XOLBLPGZBRYERU-UHFFFAOYSA-N tin dioxide Chemical compound O=[Sn]=O XOLBLPGZBRYERU-UHFFFAOYSA-N 0.000 description 1
- 229910001887 tin oxide Inorganic materials 0.000 description 1
Landscapes
- Electrostatic Charge, Transfer And Separation In Electrography (AREA)
Abstract
Description
【０００１】0001
【産業上の利用分野】この発明は、電子写真複写機等に
用いられる帯電ロールに関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention This invention relates to a charging roll used in electrophotographic copying machines and the like.
【０００２】0002
【従来の技術】電子写真複写機は、感光ドラムの表面に
原稿像を静電潜像として形成し、これにトナーを付着さ
せてトナー像を形成し、このトナー像を複写紙に転写す
ることにより複写を行うものである。この場合、感光ド
ラム表面に対して静電潜像を形成させるには、あらかじ
め感光ドラム表面を帯電させ、その帯電部分に対して原
稿像を光学系を介して投射し、光の通つた部分の帯電を
消すことにより静電潜像をつくるということが行われて
いる。上記静電潜像の形成に先立つて感光ドラム表面を
帯電させる方式として、従来からコロナ放電方式または
接触帯電方式がある。上記コロナ帯電方式は、感光ドラ
ム表面に対してコロナ放電器からコロナ放電を施し帯電
処理するものである。この方式は、一般に５〜１０ｋＶ
という高圧電源を使用するため、万全な安全策をとる必
要があるうえ、放電に伴い有害なオゾンを発生するとい
う難点がある。このため、最近では帯電ロールを感光ド
ラム表面に摺接させて感光ドラム表面を帯電させる接触
帯電方式が注目されている。2. Description of the Related Art An electrophotographic copying machine forms a document image as an electrostatic latent image on the surface of a photosensitive drum, attaches toner to this latent image to form a toner image, and transfers this toner image to copy paper. Copying is done by In this case, in order to form an electrostatic latent image on the surface of the photosensitive drum, the surface of the photosensitive drum is charged in advance, and an original image is projected onto the charged area via an optical system, and the area through which the light passes is An electrostatic latent image is created by erasing the charge. Conventional methods for charging the surface of the photosensitive drum prior to forming the electrostatic latent image include a corona discharge method and a contact charging method. In the corona charging method, the surface of the photosensitive drum is charged by applying corona discharge from a corona discharger. This method generally uses 5 to 10 kV
Because it uses a high-voltage power source, it is necessary to take thorough safety measures, and it also has the disadvantage of generating harmful ozone as it discharges. For this reason, recently, a contact charging method has been attracting attention, in which the surface of the photosensitive drum is charged by bringing a charging roll into sliding contact with the surface of the photosensitive drum.
【０００３】このような接触帯電方式を応用した電子写
真複写機は、図２に示すように構成され、つぎのように
して複写を行う。すなわち、軸１ａを中心に矢印方向に
回転する感光ドラム１の外周面に、帯電ロール２を上記
感光ドラム１とは逆方向または順方向に回転させ、部分
的に弾性変形させながら摺接させる。この帯電ロール２
の摺接により感光ドラム１の外表面が帯電される。３は
露光機構部でここを介して原稿光像のスリツト露光８が
感光ドラム１表面に到達し、原稿像に対応した静電潜像
が感光ドラム１表面に形成される。４は現像装置であり
、上記静電潜像に対してトナーを付着させトナー像を形
成する。６は給紙機構ロールであり、複写紙１１を感光
ドラム１表面に対して供給し、転写装置５を介してトナ
ー像を複写紙１１上に転写する。７はトナー像が形成さ
れた複写紙１１を通過させて定着する定着ロールである
。このようにして、複写体（コピー）が得られる。なお
、感光ドラム１表面はクリーナー９により転写残像や残
存トナーを除去され、さらにイレーサーランプ１０によ
つて全面光照射をうけ零電位化され、つぎの帯電に備え
る。図において、１２は電源である。An electrophotographic copying machine to which such a contact charging method is applied is constructed as shown in FIG. 2, and copies are made in the following manner. That is, the charging roll 2 is rotated in the opposite direction or the forward direction of the photosensitive drum 1, and is brought into sliding contact with the outer circumferential surface of the photosensitive drum 1, which rotates in the direction of the arrow around the shaft 1a, while being partially elastically deformed. This charging roll 2
The outer surface of the photosensitive drum 1 is charged by the sliding contact. 3 is an exposure mechanism section through which slit exposure 8 of the original optical image reaches the surface of the photosensitive drum 1, and an electrostatic latent image corresponding to the original image is formed on the surface of the photosensitive drum 1. 4 is a developing device which applies toner to the electrostatic latent image to form a toner image. A paper feeding mechanism roll 6 supplies the copy paper 11 to the surface of the photosensitive drum 1 and transfers the toner image onto the copy paper 11 via the transfer device 5 . A fixing roll 7 passes through the copy paper 11 on which a toner image is formed and fixes the copy paper 11 thereon. In this way, a copy is obtained. Note that the surface of the photosensitive drum 1 is cleaned of transfer afterimages and residual toner by a cleaner 9, and is further irradiated with light from an eraser lamp 10 to bring the surface to zero potential, in preparation for the next charging. In the figure, 12 is a power supply.
【０００４】0004
【発明が解決しようとする課題】上記電子写真複写機に
用いられている帯電ロール２は、通常、図３に示すよう
に、金属シヤフト（芯金）２１と、その外周面に形成さ
れた導電性弾性体層２２と、さらにこの導電性弾性体層
２２の外周面に形成された帯電層２３によつて構成され
ている。ところが、このような帯電層２３を備えた帯電
ロール２では、複写時において、交流電圧を帯電ロール
２に印加し感光ドラム１を所定の電圧に帯電させる際に
、上記交流電圧印加に起因する微振動が発生し、さらに
この微振動により音が発生して使用者およびその周囲の
人間に不快感を与えるという問題が生じる。[Problems to be Solved by the Invention] The charging roll 2 used in the above-mentioned electrophotographic copying machine usually has a metal shaft (core metal) 21 and a conductive metal shaft formed on the outer circumferential surface of the charging roll 2, as shown in FIG. It is composed of a elastic elastic layer 22 and a charged layer 23 formed on the outer peripheral surface of the conductive elastic layer 22. However, in the charging roll 2 provided with such a charging layer 23, when an AC voltage is applied to the charging roll 2 and the photosensitive drum 1 is charged to a predetermined voltage during copying, a small amount of noise due to the application of the AC voltage is generated. A problem arises in that vibrations are generated, and furthermore, these minute vibrations generate sounds that cause discomfort to the user and the people around him.
【０００５】この発明は、このような事情に鑑みなされ
たもので、使用時に生ずる不快音を抑制することのでき
る帯電ロールの提供をその目的とする。The present invention was made in view of the above circumstances, and an object of the present invention is to provide a charging roll that can suppress unpleasant noises generated during use.
【０００６】[0006]
【課題を解決するための手段】上記の目的を達成するた
め、この発明の帯電ロールは、軸体と、この軸体の外周
に円周に沿つて形成された導電性弾性体層と、この導電
性弾性体層の外周面に形成された最外層となる帯電層と
を備えた帯電ロールであつて、上記帯電層が、高分子材
料からなるマトリツクス成分中に粒径７〜３０μｍの弾
性体粒子が分散された弾性体によつて形成されており、
しかも上記帯電層表面の粗度Ｒｚが７〜３０μｍに形成
されているという構成をとる。[Means for Solving the Problems] In order to achieve the above object, the charging roll of the present invention includes a shaft, a conductive elastic layer formed circumferentially around the shaft, and a conductive elastic layer formed along the circumference of the shaft. A charging roll comprising a charging layer serving as the outermost layer formed on the outer peripheral surface of a conductive elastic layer, the charging layer comprising an elastic body having a particle size of 7 to 30 μm in a matrix component made of a polymeric material. It is made of an elastic body with particles dispersed in it,
Moreover, the charging layer has a surface roughness Rz of 7 to 30 μm.
【０００７】[0007]
【作用】すなわち、本発明者らは、使用時に発生する不
快音の低減を目的に一連の研究を重ねた。その研究の過
程で、騒音の発生原因である微振動について研究し、上
記微振動の発生原因についてさらに研究を重ねた。その
結果、上記微振動は、帯電ロールに印加する交流電圧に
起因し、この交流電圧の周期的な電圧の方向と大きさが
変化することによつて帯電ロールと感光ドラムの間に周
期的変化をともなう引力が発生し、それが原因で微振動
が生ずることを突き止めた。さらに、実験により音の周
波数は交流の周波数の２倍となることが確認された。そ
して、この電気エネルギーから微振動へ、つぎにこの微
振動から騒音へと変換がなされているのではないかと想
起し、騒音発生の根本原因である電気エネルギーを中心
にさらに研究を重ねた。その結果、帯電ロールの帯電能
力は低下させず、すなわち、感光ドラムに対する見掛け
の接触面積は同じで、実接触面積を小さくすれば、不快
音の発生を抑制できることを突き止めた。そして、上記
実接触面積を小さくする方法として、帯電ロールの帯電
層の形成材料として、特定の粒径の弾性体粒子を用い、
しかも帯電層の表面粗度を従来に比べて大きい特定の範
囲に設定すると、帯電ロールと感光ドラムの間に発生す
る周期的変化をともなう引力が小さくなり、微振動が抑
制され発生する騒音が低減されることを見出しこの発明
に到達した。[Operation] That is, the present inventors have conducted a series of studies with the aim of reducing unpleasant noises generated during use. In the course of this research, we studied micro-vibrations, which are the cause of noise, and further researched the causes of the above-mentioned micro-vibrations. As a result, the above-mentioned micro-vibration is caused by the AC voltage applied to the charging roll, and due to changes in the direction and magnitude of the AC voltage, periodic changes occur between the charging roll and the photosensitive drum. It was discovered that an gravitational force accompanied by this occurs, and that this is the cause of the slight vibrations. Furthermore, experiments have confirmed that the frequency of sound is twice the frequency of alternating current. Recalling that this electrical energy may be converted into micro-vibration, and then from this micro-vibration into noise, he conducted further research focusing on electrical energy, which is the root cause of noise generation. As a result, it was found that unpleasant noise could be suppressed by reducing the actual contact area without reducing the charging ability of the charging roll, that is, by keeping the apparent contact area with the photosensitive drum the same. As a method for reducing the actual contact area, elastic particles of a specific particle size are used as the material for forming the charging layer of the charging roll.
Moreover, by setting the surface roughness of the charging layer to a specific range that is larger than before, the attractive force that occurs between the charging roll and the photosensitive drum that occurs with periodic changes becomes smaller, suppressing minute vibrations and reducing the noise generated. This invention was achieved by discovering that this can be done.
【０００８】つぎに、この発明を詳細に説明する。Next, the present invention will be explained in detail.
【０００９】この発明の帯電ロールは、軸体と、その外
周に形成される導電性弾性体層と、さらにこの導電性弾
性体層の外周に形成される最外層となる帯電層とから構
成されている。The charging roll of the present invention is composed of a shaft, a conductive elastic layer formed on the outer periphery of the shaft, and an outermost charging layer formed on the outer periphery of the conductive elastic layer. ing.
【００１０】上記軸体としては、特に限定するものでは
なく、金属製の円柱体からなる芯金等が用いられ、上記
金属としては従来公知のものがあげられる。The shaft body is not particularly limited, and a metal core made of a cylindrical body or the like may be used, and conventionally known metals may be used as the metal.
【００１１】上記軸体の外周に、円周に沿つて形成され
る導電性弾性体層の形成材料としては、ポリノルボーネ
ンゴム，エチレン−プロピレンゴム，クロロプレンゴム
，ニトリルゴム，シリコーンゴム等にカーボンブラツク
，金属粉等の導電材粒子を分散したゴム組成物があげら
れる。特に、低硬度時の強度，オイル滲み性および加工
性等の観点から、ポリノルボーネンゴム，エチレン−プ
ロピレンゴムおよびその混和物にカーボンブラツク（ケ
ツチエンブラツクＥＣ）を配合したゴム組成物が好まし
い。Materials for forming the conductive elastic layer circumferentially around the outer circumference of the shaft include polynorbornene rubber, ethylene-propylene rubber, chloroprene rubber, nitrile rubber, silicone rubber, etc. Examples include rubber compositions in which conductive material particles such as black and metal powder are dispersed. In particular, from the viewpoint of strength at low hardness, oil permeability, processability, etc., a rubber composition in which carbon black (Kettien Black EC) is blended with polynorbornene rubber, ethylene-propylene rubber, and a mixture thereof is preferred.
【００１２】上記導電性弾性体層の外周面に形成される
最外層となる帯電層の形成材料としては、マトリツクス
成分である高分子材料と、特定の弾性体粒子と、導電性
粉末とが用いられる。[0012] As materials for forming the outermost charged layer formed on the outer peripheral surface of the conductive elastic layer, a polymeric material as a matrix component, specific elastic particles, and conductive powder are used. It will be done.
【００１３】上記高分子材料としては、Ｎ−メトキシメ
チル化ナイロン樹脂，ウレタン樹脂等の合成樹脂があげ
られる。特に好ましい合成樹脂としては、Ｎ−メトキシ
メチル化ナイロンがあげられ、このＮ−メトキシメチル
化ナイロンは、６−ナイロンのアミド基をメトキシメチ
ル化することによつて得られるものであり、そのメトキ
シ化率を高くすることによつてアルコールに対する溶解
性が向上する。Examples of the polymeric material include synthetic resins such as N-methoxymethylated nylon resin and urethane resin. A particularly preferred synthetic resin is N-methoxymethylated nylon, which is obtained by methoxymethylating the amide group of 6-nylon. Increasing the ratio improves solubility in alcohol.
【００１４】上記特定の弾性体粒子としては、粒径７〜
３０μｍの弾性体粒子を用いる必要がある。上記弾性体
粒子としては、感光ドラム接触時にドラム表面を傷付け
ないよう、比較的軟らかいもの、例えば、ウレタン樹脂
粒子，ナイロン粒子，シリコンゴム粒子，エポキシ樹脂
粒子等があげられ、単独でもしくは併せて用いられる。[0014] The above-mentioned specific elastic particles have a particle size of 7 to 7.
It is necessary to use elastic particles of 30 μm. The above-mentioned elastic particles include relatively soft particles such as urethane resin particles, nylon particles, silicone rubber particles, epoxy resin particles, etc., which can be used alone or in combination to prevent damage to the drum surface when in contact with the photosensitive drum. It will be done.
【００１５】上記特定の弾性体粒子の含有割合は、高分
子材料１００重量部（以下「部」と略す）に対して５〜
２０部の割合に設定することが効果の点で好ましい。[0015] The content ratio of the above-mentioned specific elastic particles is 5 to 100 parts by weight (hereinafter abbreviated as "parts") of the polymeric material.
From the viewpoint of effectiveness, it is preferable to set the ratio to 20 parts.
【００１６】上記導電性粉末としては、カーボンブラツ
ク，酸化錫等があげられる。[0016] Examples of the conductive powder include carbon black and tin oxide.
【００１７】この発明の帯電ロールは、例えばつぎのよ
うに製造することができる。すなわち、まず円筒状成形
空間を有する成形型内に、金属製の軸体（芯金）を入れ
、成形型内に導電性弾性体層形成材料を充填し加硫を行
うことにより芯型の外周面に導電性弾性体層を形成する
。ついで、導電性弾性体層の形成された芯金を成形型か
ら取り出す。一方、高分子材料と、特定の弾性体粒子と
、他の添加剤を配合し、この配合物をボールミル等を用
いて混合，攪拌し帯電層形成材料混合物を作製する。
そして、この混合物を、デイツプ法，ロールコート法，
スプレーコーテイング法等によつて上記導電性弾性体層
の形成された芯金表面に均一厚みに塗工して乾燥し、加
熱硬化することにより、図１に示すような２層構造の帯
電ロールを製造することができる。図において、１５は
芯金、１６は導電性弾性体層、１７は帯電層である。The charging roll of the present invention can be manufactured, for example, as follows. That is, first, a metal shaft (core metal) is placed in a mold having a cylindrical molding space, and the outer periphery of the core is filled with a conductive elastic layer forming material and vulcanized. A conductive elastic layer is formed on the surface. Then, the core bar on which the conductive elastic layer is formed is taken out from the mold. On the other hand, a polymer material, specific elastic particles, and other additives are blended, and this blend is mixed and stirred using a ball mill or the like to prepare a charged layer forming material mixture. Then, this mixture is coated by dip method, roll coating method, etc.
By coating the surface of the core bar on which the conductive elastic layer is formed to a uniform thickness by a spray coating method, drying, and curing by heating, a charging roll with a two-layer structure as shown in FIG. 1 is formed. can be manufactured. In the figure, 15 is a metal core, 16 is a conductive elastic layer, and 17 is a charged layer.
【００１８】このようにして得られる帯電ロールは、そ
の最外層である帯電層表面の粗度Ｒｚが７〜３０μｍに
形成される。すなわち、帯電層表面の表面粗度が７μｍ
未満では騒音発生の抑制効果が得られず、３０μｍを超
えると感光ドラムとの接触時の空隙が大きくなりすぎ充
分な帯電の付与がなされなくなるからである。上記のよ
うに帯電層表面が形成されるため、感光ドラムに対する
実接触面積が小さくなり（見掛けの接触面積は変わらな
い）、不快音の発生が抑制され、例えば、１０００Ｈｚ
の音の周波数で３〜７ｄｂの低減が可能となる。なお、
粗度Ｒｚの測定には、東京精密社製の表面粗度計Ｓｕｒ
ｆｃｏｍ−５５０Ａを用い、設定をつぎのようにした。
すなわち、ピツクアツプ：０．２、触針：０．８、カツ
トオフ：０．８、測定距離：４ｍｍ、測定スピード：０
．３ｍｍ／ｓｅｃ に設定した。The charging roll thus obtained has a surface roughness Rz of 7 to 30 μm on the surface of the charging layer, which is the outermost layer. That is, the surface roughness of the charged layer surface is 7 μm.
If it is less than 30 μm, the effect of suppressing noise generation cannot be obtained, and if it exceeds 30 μm, the gap during contact with the photosensitive drum becomes too large and sufficient charge cannot be applied. Since the surface of the charged layer is formed as described above, the actual contact area with the photosensitive drum becomes smaller (the apparent contact area remains unchanged), and the generation of unpleasant noise is suppressed.
It is possible to reduce the sound frequency by 3 to 7 db. In addition,
To measure the roughness Rz, we used a surface roughness meter Sur manufactured by Tokyo Seimitsu Co., Ltd.
Using fcom-550A, the settings were as follows. That is, pick-up: 0.2, stylus: 0.8, cut-off: 0.8, measurement distance: 4 mm, measurement speed: 0
．． The speed was set at 3 mm/sec.
【００１９】[0019]
【発明の効果】以上のように、この発明の帯電ロールは
、最外層である帯電層が、高分子材料であるマトリツク
ス成分中に特定の粒径の弾性体粒子を分散含有させた弾
性体で形成され、しかも形成された帯電層表面が、特定
範囲の粗度Ｒｚを有するものである。このため、感光ド
ラムに対する実接触面積が少なくなり、発生する騒音を
低減させることが可能となる。したがつて、例えば上記
帯電ロールを電子写真複写機に組み込んで使用した場合
、複写時に生ずる騒音が小さくなり使用者およびその周
囲の人間に不快感を与えることが抑制される。[Effects of the Invention] As described above, in the charging roll of the present invention, the outermost charging layer is made of an elastic body in which elastic particles of a specific particle size are dispersed in a matrix component that is a polymeric material. The surface of the charged layer formed has a roughness Rz within a specific range. Therefore, the actual contact area with the photosensitive drum is reduced, making it possible to reduce the noise generated. Therefore, for example, when the charging roll is incorporated into an electrophotographic copying machine and used, the noise generated during copying is reduced, and discomfort to the user and people around him is suppressed.
【００２０】つぎに、実施例について比較例と併せて説
明する。Next, examples will be explained together with comparative examples.
【００２１】[0021]
【実施例１〜５】導電性弾性体層形成材料として、下記
の原料を下記に示す割合で配合し、ボールミルにより混
合攪拌し導電性弾性体層形成材料混合物を準備した。
ポリノルボーネンゴム
１００部ケツチエンブラツク
３０部ナフテン系オイル
３００部
そして、上記以外に常法にしたがつて、加硫剤，加硫促
進剤，助剤および添加剤を配合した。Examples 1 to 5 As a material for forming a conductive elastic layer, the following raw materials were blended in the proportions shown below and mixed and stirred in a ball mill to prepare a mixture of materials for forming a conductive elastic layer. polynorbornene rubber
100 part butt chain black
30 parts naphthenic oil
300 parts and in addition to the above, a vulcanizing agent, a vulcanization accelerator, an auxiliary agent, and an additive were added according to a conventional method.
【００２２】また、帯電層形成材料として、後記の表１
に示す原料を同表に示す割合で配合し、ボールミルによ
り混合攪拌し帯電層形成材料混合物を準備した。そして
、円筒状成形空間を有する金型内に、軸体である鉄製の
芯金を入れ、成形空間に上記導電性弾性体層形成材料混
合物を充填し金型加硫（加硫条件：温度１５０℃、時間
４５分）を行い、芯金の外周に導電性弾性体層〔ゴム硬
度（ＪＩＳＡ）２１、電気抵抗１×１０４ Ω・ｃｍ２
〕を形成した。つぎに、導電性弾性体層の形成された
芯金を、上記帯電層形成材料混合物中に浸漬してコーテ
イングしたのち、引き上げて乾燥させ、ついで加熱処理
して帯電層を形成した。そして、図１に示すような帯電
ロールを作製した。また、得られた帯電ロール表面の粗
度Ｒｚを前記装置を用いて測定し、これを表１に併せて
示した。[0022] In addition, as the material for forming the charged layer, Table 1 below is used.
The raw materials shown in Table 1 were blended in the proportions shown in the same table, and mixed and stirred using a ball mill to prepare a charged layer forming material mixture. Then, an iron core bar serving as a shaft is placed in a mold having a cylindrical molding space, the molding space is filled with the conductive elastic layer forming material mixture, and the mold is vulcanized (vulcanization conditions: temperature 150 ℃ for 45 minutes), and a conductive elastic layer [rubber hardness (JISA) 21, electrical resistance 1 x 104 Ωcm2] was applied to the outer circumference of the core bar.
] was formed. Next, the metal core on which the conductive elastic layer was formed was dipped in the charged layer forming material mixture to be coated, then pulled up and dried, and then heated to form a charged layer. Then, a charging roll as shown in FIG. 1 was produced. Further, the roughness Rz of the surface of the charging roll obtained was measured using the above-mentioned apparatus, and the results are also shown in Table 1.
【００２３】[0023]
【表１】[Table 1]
【００２４】＊１：Ｎ−メトキシメチル化ナイロン（帝
国化学社製，トレジンＥＦ３０Ｔ）を用いた。
＊２：東レダウコーニング社製のトレフイルＲを用いた
。
＊３：大日本インキ社製のパンデツクスＴ５０２を用い
た。*1: N-methoxymethylated nylon (manufactured by Teikoku Kagaku Co., Ltd., Torezin EF30T) was used. *2: Torayfil R manufactured by Dow Corning Toray was used. *3: Pandex T502 manufactured by Dainippon Ink Co., Ltd. was used.
【００２５】[0025]
【比較例１〜３】帯電層形成材料として、後記の表２に
示す原料を同表に示す割合で配合した。それ以外は実施
例１と同様にして導電性弾性体層および帯電層の２層構
造からなる帯電ロールを作製した。また、得られた帯電
ロール表面の粗度Ｒｚを測定し、これを表２に併せて示
した。[Comparative Examples 1 to 3] As charged layer forming materials, raw materials shown in Table 2 below were blended in the proportions shown in the table. A charging roll having a two-layer structure of a conductive elastic layer and a charging layer was produced in the same manner as in Example 1 except for the above. Furthermore, the roughness Rz of the surface of the charging roll obtained was measured and is also shown in Table 2.
【００２６】[0026]
【表２】[Table 2]
【００２７】＊１：Ｎ−メトキシメチル化ナイロン（帝
国化学社製，トレジンＥＦ３０Ｔ）を用いた。
＊２：東レダウコーニング社製のトレフイルＲを用いた
。
＊３：大日本インキ社製のパンデツクスＴ５０２を用い
た。*1: N-methoxymethylated nylon (manufactured by Teikoku Kagaku Co., Ltd., Torezin EF30T) was used. *2: Torayfil R manufactured by Dow Corning Toray was used. *3: Pandex T502 manufactured by Dainippon Ink Co., Ltd. was used.
【００２８】以上のようにして得られた実施例品および
比較例品の帯電ロールを図２に示す電子写真複写機に組
み込んで複写を行つた。そして、複写の際に生じた騒音
のレベルを測定するとともに、複写紙の画質状態を測定
した。この結果を下記の表３に示した。The charging rolls of the Examples and Comparative Examples obtained as described above were incorporated into an electrophotographic copying machine shown in FIG. 2, and copies were made. Then, the level of noise generated during copying was measured, as well as the image quality of the copy paper. The results are shown in Table 3 below.
【００２９】[0029]
【表３】[Table 3]
【００３０】上記比較例２品は騒音レベルは低かつたが
、粗度が３０μｍ以上で画質が悪かつた。このように、
上記表３の結果から、実施例品は騒音のレベルが低く、
しかも画質も良好である。このことから、実施例品では
不快音の発生が抑制され、優れた画質のものが得られる
ことがわかる。[0030] The above two products of Comparative Example had a low noise level, but the roughness was 30 μm or more and the image quality was poor. in this way,
From the results in Table 3 above, the example product has a low noise level;
Moreover, the image quality is also good. From this, it can be seen that in the example products, generation of unpleasant sounds is suppressed and excellent image quality can be obtained.
【００３１】また、得られた帯電ロール表面の粗度と発
生する騒音レベルとの関係を図４に示した。図４から、
粗度Ｒｚが７μｍ未満では騒音レベルが高く、粗度が３
０μｍでは感光ドラムの帯電が不充分なため、得られる
複写画像の画質が悪いことがわかる。FIG. 4 shows the relationship between the roughness of the surface of the charging roll obtained and the noise level generated. From Figure 4,
When the roughness Rz is less than 7 μm, the noise level is high;
It can be seen that when the thickness is 0 μm, the photosensitive drum is insufficiently charged, so that the quality of the obtained copy image is poor.
【図１】この発明の帯電ロールの断面図である。FIG. 1 is a sectional view of a charging roll of the present invention.
【図２】帯電ロールが組み込まれた電子複写機の構成図
である。FIG. 2 is a configuration diagram of an electronic copying machine incorporating a charging roll.
【図３】従来の帯電ロールの断面図である。FIG. 3 is a cross-sectional view of a conventional charging roll.
【図４】帯電層表面の粗度と騒音レベルおよび画質の関
係を示す粗度−騒音レベル（画質）の曲線図である。FIG. 4 is a roughness-noise level (image quality) curve diagram showing the relationship between the roughness of the charged layer surface, noise level, and image quality.
１５ 芯金 １６ 導電性弾性体層 １７ 帯電層 15 Core metal 16 Conductive elastic layer 17 Charged layer
Claims (1)
て形成された導電性弾性体層と、この導電性弾性体層の
外周面に形成された最外層となる帯電層とを備えた帯電
ロールであつて、上記帯電層が、高分子材料からなるマ
トリツクス成分中に粒径７〜３０μｍの弾性体粒子が分
散された弾性体によつて形成されており、しかも上記帯
電層表面の粗度Ｒｚが７〜３０μｍに形成されているこ
とを特徴とする帯電ロール。Claim 1: A shaft, a conductive elastic layer formed circumferentially around the shaft, and a charged layer serving as the outermost layer formed on the outer circumferential surface of the conductive elastic layer. The charging roll is provided with: the charging layer is formed of an elastic body in which elastic particles having a particle size of 7 to 30 μm are dispersed in a matrix component made of a polymeric material; A charging roll having a surface roughness Rz of 7 to 30 μm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3093068A JP3024248B2 (en) | 1991-03-30 | 1991-03-30 | Charging roll |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3093068A JP3024248B2 (en) | 1991-03-30 | 1991-03-30 | Charging roll |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH04303860A true JPH04303860A (en) | 1992-10-27 |
| JP3024248B2 JP3024248B2 (en) | 2000-03-21 |
Family
ID=14072199
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3093068A Expired - Fee Related JP3024248B2 (en) | 1991-03-30 | 1991-03-30 | Charging roll |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3024248B2 (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2003087954A1 (en) * | 2002-04-12 | 2003-10-23 | Bridgestone Corporation | Conductive roller and imaging apparatus |
| JP2010086003A (en) * | 2003-06-30 | 2010-04-15 | Canon Inc | Charging member, process cartridge, and electrophotographic apparatus |
| JP2010276810A (en) * | 2009-05-28 | 2010-12-09 | Tokai Rubber Ind Ltd | Charging roll |
| JP2011095546A (en) * | 2009-10-30 | 2011-05-12 | Tokai Rubber Ind Ltd | Charging roll |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4666051B2 (en) | 2008-10-24 | 2011-04-06 | 富士ゼロックス株式会社 | Charging member, charging device, process cartridge, and image forming apparatus |
| JP5120310B2 (en) | 2009-03-27 | 2013-01-16 | 富士ゼロックス株式会社 | Charging member, process cartridge, and image forming apparatus |
-
1991
- 1991-03-30 JP JP3093068A patent/JP3024248B2/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2003087954A1 (en) * | 2002-04-12 | 2003-10-23 | Bridgestone Corporation | Conductive roller and imaging apparatus |
| JP2010086003A (en) * | 2003-06-30 | 2010-04-15 | Canon Inc | Charging member, process cartridge, and electrophotographic apparatus |
| JP2010276810A (en) * | 2009-05-28 | 2010-12-09 | Tokai Rubber Ind Ltd | Charging roll |
| JP2011095546A (en) * | 2009-10-30 | 2011-05-12 | Tokai Rubber Ind Ltd | Charging roll |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3024248B2 (en) | 2000-03-21 |
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