JPH0962058A - Electrifying member and electrifying device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electrifying member having low density and flat surface and an electrifying device using the same for attaining speeding-up and durability at a latent image forming in a copying machine, printer, etc. SOLUTION: (1) In the electrifying member which is constituted of a shaft 1, an elastic layer 2 and a conductive layer 3, the latter two are successively formed on an outer periphery of the shaft 1, and electrifies an object to be electrified by brining the object into contact therewith and impressing the voltage between the object and the member, the conductive layer 3 is consisting essentially of a polyester resin having >=-16 to <=50 deg.C glass transition temp. and (2) a covering layer 4 formed on an outer periphery of the conductive layer 3 is consisting essentially of an acrylic resin modified by urethane or a nylon resin and, further, (3) the elastic layer 2 is an electrifying member of a foam body. (4) In the electrifying device which is provided with the electrifying member electrifying the object to be electrified by bringing the object into contact therewith and a voltage impressing means for impressing the voltage between the object and the electrifying member, the electrifying member having low density and flat surface and the electrifying device using the same can be provided by constituting the electrifying device by using (1) to (3) electrifying members.

Description

【発明の詳細な説明】Detailed Description of the Invention

【０００１】[0001]

【産業の属する技術分野】本発明は、複写機、プリンタ
ー等において、静電潜像プロセスに用いられる感光体等
の被帯電体を帯電させるのに使用する帯電部材及びそれ
を用いた帯電装置に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a charging member used for charging an object to be charged such as a photosensitive member used in an electrostatic latent image process in a copying machine, a printer and the like, and a charging device using the same. Things.

【０００２】[0002]

【従来の技術】従来、複写機、プリンター等の電子写真
プロセスでは、まず、感光体の表面を一様に帯電させ、
この感光体に光学系から映像を投射して、光の当たった
部分の帯電を消去することによって潜像を形成し、次い
で、トナーの付着によるトナー像の形成、紙等への記録
媒体へのトナー像の転写により、プリントする方法がと
られている。この場合、最初の感光体を帯電させる操作
は、コロナ放電方式が一般的に採用されてきた。しかし
ながら、このコロナ放電方式は６〜１０ｋＶもの高電圧
印加が必要とされるため、機械の安全保守の観点から好
ましくない。また、コロナ放電中にオゾン等の有害物質
が発生するため環境上の問題もある。2. Description of the Related Art Conventionally, in electrophotographic processes such as copying machines and printers, first, the surface of a photoconductor is uniformly charged,
A latent image is formed by projecting an image from the optical system onto the photoconductor to erase the electrification of a portion exposed to light, and then a toner image is formed by adhesion of toner, and a latent image is formed on a recording medium such as paper. Printing is performed by transferring a toner image. In this case, a corona discharge method has generally been used for the first operation of charging the photoconductor. However, this corona discharge method requires application of a high voltage of 6 to 10 kV, which is not preferable from the viewpoint of safe maintenance of the machine. Further, there are environmental problems because harmful substances such as ozone are generated during corona discharge.

【０００３】このため、コロナ放電に比べて低い印加電
圧で帯電を行うことができ、かつ、オゾン等の有害物質
の発生を抑制することができる帯電方式への取り組みが
なされてきている。かかる帯電方式の試みとして、電圧
を印加した帯電用部材を感光体等の被帯電体に接触させ
ることにより、被帯電体を帯電させる接触方式による方
法が提案されており、かかる接触帯電方式で使用される
帯電部材としては、カーボン等の導電粒子を分散させた
ゴムの上に導電性無機酸化物を分散させたナイロンなど
の塗膜を形成させたローラが知られている。[0003] For this reason, efforts have been made for a charging method that can perform charging at a lower applied voltage than corona discharge and that can suppress generation of harmful substances such as ozone. As an attempt of such a charging method, a contact method in which a charged member is charged by bringing a charging member to which a voltage is applied into contact with a charged object such as a photoreceptor has been proposed. As a charging member to be used, there is known a roller in which a coating film such as nylon in which a conductive inorganic oxide is dispersed is formed on rubber in which conductive particles such as carbon are dispersed.

【０００４】しかしながら、高速性、耐久性等の性能向
上がさらに必要となってきている。このような要求を満
足させるには、帯電部材と感光体の確固たる接触状態を
保つことが重要であり、十分な安定したニップ幅がとれ
るように、帯電部材を軟らかくし、表面を平坦化する必
要があるが、今までそのような材料は配合上かなり困難
であるとされていた。これは、帯電部材の低硬度化には
軟らかい材料が当然有利であるが、帯電部材の表面平坦
化にはむしろ硬い材料が有利のようであることに起因す
る。従って、低硬度かつ表面平坦化を両立できる材料が
望まれている。However, there is a further need to improve performance such as high speed and durability. In order to satisfy such demands, it is important to maintain a firm contact between the charging member and the photoreceptor, and it is necessary to soften the charging member and flatten the surface so as to obtain a sufficiently stable nip width. However, such materials have heretofore been considered quite difficult to formulate. This is because a soft material is naturally advantageous for lowering the hardness of the charging member, but a harder material seems to be more advantageous for flattening the surface of the charging member. Therefore, there is a demand for a material having both low hardness and surface flatness.

【０００５】[0005]

【発明が解決しようとする課題】本発明は、このような
事情に鑑みてなされたものであり、複写機、プリンター
等の潜像形成において、高速性、耐久性を画った低硬度
かつ表面平坦な帯電部材及びそれを用いた帯電装置を提
供することを目的とする。SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and has low hardness and surface with high speed and durability in forming a latent image in a copying machine, a printer or the like. An object of the present invention is to provide a flat charging member and a charging device using the same.

【０００６】[0006]

【課題を解決するための手段】本発明では、先ず、請求
項１に記載の如く、シャフトと、その外周に弾性層、導
電層が順次形成してなり、被帯電体に当接させ、この被
帯電体との間に電圧を印加することにより、前記被帯電
体を帯電させる帯電部材において、上記導電層の主材
が、ガラス転移温度が−１６℃以上５０℃以下のポリエ
ステル樹脂であることを特徴とする。さらに、請求項２
に記載の如く、上記導電層の外周に形成される被覆層の
主材が、ウレタン変性アクリル樹脂又はナイロン樹脂で
あることを特徴とする。さらに、請求項３に記載の如
く、上記弾性層がフォーム体であることを特徴とする。
さらに、請求項４に記載した如く、被帯電体に当接し被
帯電体を帯電させる帯電部材と、被帯電体と帯電部材と
の間に電圧を印加する電圧印加手段とを具備してなる帯
電装置において、上記請求項１乃至３いずれか１項記載
の帯電部材を用いたことを特徴とする。In the present invention, first, as described in claim 1, a shaft and an elastic layer and a conductive layer are sequentially formed on the outer periphery of the shaft, and the elastic layer and the conductive layer are brought into contact with a body to be charged. In the charging member for charging the charged body by applying a voltage to the charged body, the main material of the conductive layer is a polyester resin having a glass transition temperature of -16 ° C or higher and 50 ° C or lower. Is characterized by. Further, claim 2
The main material of the coating layer formed on the outer circumference of the conductive layer is urethane-modified acrylic resin or nylon resin. Further, as described in claim 3, the elastic layer is a foam body.
Further, as described in claim 4, a charging member comprising a charging member that contacts the member to be charged and charges the member to be charged, and a voltage applying unit that applies a voltage between the member to be charged and the charging member. In a device, the charging member according to any one of claims 1 to 3 is used.

【０００７】[0007]

【発明の実施の形態】本発明者らは、鋭意検討を重ねた
結果、ガラス転移温度が−１６℃以上５０℃以下、好ま
しくは−１０℃以上３５℃以下、さらに好ましくは−５
℃以上３０℃以下のポリエステル樹脂を導電層とし、そ
の被覆層としてさらにウレタン変性アクリル樹脂または
ナイロン樹脂を用い、弾性層をフォーム体とした帯電部
材を用いることにより、上記目的を達成できることを見
いだし本発明に至ったものである。BEST MODE FOR CARRYING OUT THE INVENTION As a result of intensive investigations, the present inventors have found that the glass transition temperature is -16 ° C or higher and 50 ° C or lower, preferably -10 ° C or higher and 35 ° C or lower, and more preferably -5.
It has been found that the above object can be achieved by using a polyester resin having a temperature of 30 ° C. or higher and 30 ° C. or lower as a conductive layer, further using a urethane-modified acrylic resin or nylon resin as a coating layer thereof, and a charging member having a foam body as an elastic layer It was the invention.

【０００８】ここで、ポリエステル樹脂は一般に硬いと
いう印象であるが、ガラス転移温度を本発明の温度領域
に有する樹脂を選択するのが肝要である。本発明の温度
より高い樹脂であると、ローラ等の上に一応塗膜形成は
可能であるが、耐久時にすぐに割れ等が生じ、実用に耐
えない。また、本発明の温度より低い樹脂であると、軟
らかいものの、粘着が激しく、塗膜形成時の作業性や感
光体との相性が問題で使用できない。さらに、原因は定
かではないが、ディップ法により作成した塗膜は、上記
低硬度を維持しながらも、表面はかなり平坦化できる。
故に、本発明のガラス転移温度を有する樹脂であれば、
粘着もなく、低硬度かつ表面平坦な帯電部材を提供でき
る。Here, the polyester resin is generally hard, but it is important to select a resin having a glass transition temperature in the temperature range of the present invention. If the resin is higher than the temperature of the present invention, it is possible to form a coating film on a roller or the like, but cracks or the like occur immediately at the time of durability, so that it cannot be put to practical use. Further, when the resin is lower than the temperature of the present invention, it is soft but has a strong adhesiveness and cannot be used due to problems in workability during coating film formation and compatibility with the photoreceptor. Furthermore, although the cause is not clear, the surface of the coating film formed by the dipping method can be considerably flattened while maintaining the above-mentioned low hardness.
Therefore, if the resin having the glass transition temperature of the present invention,
It is possible to provide a charging member having low hardness and a flat surface without adhesion.

【０００９】以下、本発明について図面を用いて詳細に
説明する。本発明の帯電部材は、被帯電体に接触するも
のであれば特にその形状に限定されず、例えば、ローラ
状、プレート状、ブロック状などの各種形状のものが挙
げられるが、通常はローラ状が好ましい。The present invention will be described in detail below with reference to the drawings. The shape of the charging member of the present invention is not particularly limited as long as it comes into contact with the member to be charged, and examples thereof include various shapes such as a roller shape, a plate shape, and a block shape. Is preferred.

【００１０】図１は、本発明の帯電部材をローラ形状に
用いた一例を示す断面図である。ここで、符号１はシャ
フト、符号２は弾性層、符号３は導電層、符号４は被覆
層であり、シャフトの外周に弾性層２、導電層３が順次
形成されており、必要に応じて被覆層４が設けられる。FIG. 1 is a sectional view showing an example in which the charging member of the present invention is used in the shape of a roller. Here, reference numeral 1 denotes a shaft, reference numeral 2 denotes an elastic layer, reference numeral 3 denotes a conductive layer, and reference numeral 4 denotes a coating layer. The elastic layer 2 and the conductive layer 3 are sequentially formed on the outer periphery of the shaft. A coating layer 4 is provided.

【００１１】シャフト１としては金属又はプラスチック
製のものが挙げられる。The shaft 1 may be made of metal or plastic.

【００１２】弾性層２としては、ウレタンないしゴムの
フォームから形成され、特にウレタンフォームが挙げら
れる。なお、フォーム密度は、０．０５から０．９ｇ／
ｃｍ³ が適当である。The elastic layer 2 is formed of urethane or rubber foam, and particularly urethane foam is mentioned. The foam density is 0.05 to 0.9 g /
cm ³ is suitable.

【００１３】導電層３としては、ガラス転移温度が−１
６℃以上５０℃以下、好ましくは−１０℃以上３５℃以
下、更に好ましくは−５℃以上３０℃以下のポリエステ
ル樹脂を用いる。なかでも、溶剤可溶型で、可塑剤とし
て働くものを化学結合させた内部可塑化したタイプが、
作製工程上、感光体汚染上から好ましい。また、一部ウ
レタンと共重合させたポリエステルウレタンがあるが、
ガラス転移温度が本発明の範囲内であれば、それでも使
用可能である。The conductive layer 3 has a glass transition temperature of -1.
A polyester resin having a temperature of 6 ° C or higher and 50 ° C or lower, preferably -10 ° C or higher and 35 ° C or lower, and more preferably -5 ° C or higher and 30 ° C or lower is used. Among them, the solvent-soluble type, which is an internally plasticized type that chemically bonds with a substance that acts as a plasticizer,
It is preferable in terms of the manufacturing process and contamination of the photoreceptor. Also, there is polyester urethane copolymerized with some urethane,
If the glass transition temperature is within the range of the present invention, it can still be used.

【００１４】導電層３には、導電性を付与するために、
カーボン、グラファイト、金属酸化物等を添加し、体積
抵抗率を１０⁵ 〜１０¹⁰Ωｃｍになるように調整され
る。更に、必要に応じてシリカを加えてもよい。導電層
３の厚みは、特に制限されないが、５０〜４００μｍが
適当である。なお、層形成方法としては、以上のものを
含む塗料状態として、内層物を浸漬し塗膜を形成するデ
ィップ法が一般的である。In order to impart conductivity to the conductive layer 3,
The volume resistivity is adjusted to 10 ⁵ to 10 ¹⁰ Ωcm by adding carbon, graphite, metal oxide or the like. Further, silica may be added if necessary. The thickness of the conductive layer 3 is not particularly limited, but is preferably 50 to 400 μm. As a layer forming method, a dipping method is generally used in which the inner layer material is dipped to form a coating film in a coating state containing the above.

【００１５】被膜層４としては、ウレタン変性アクリル
樹脂またはナイロン樹脂を用いることが好ましい。な
お、ナイロン樹脂は、環境変動の点等から共重合ナイロ
ンが好ましい。また、導電性を付与するために、カーボ
ン、グラファイト、金属酸化物等を添加し、体積抵抗が
１０⁵ 〜１０¹²Ωｃｍになるように調整する。さらに、
必要に応じシリカを加えても良い。被覆層４の厚みは、
特に限定されないが、ポリエステル樹脂の柔らかさを損
なわないために１〜３０μｍが適当である。これによ
り、高温時での、感光体との密着もさらに改良される。As the coating layer 4, it is preferable to use urethane-modified acrylic resin or nylon resin. The nylon resin is preferably a copolymerized nylon in view of environmental changes. Further, in order to impart conductivity, carbon, graphite, metal oxide or the like is added to adjust the volume resistance to 10 ⁵ to 10 ¹² Ωcm. further,
Silica may be added if necessary. The thickness of the coating layer 4 is
Although not particularly limited, 1 to 30 μm is suitable so as not to impair the softness of the polyester resin. This further improves the adhesion to the photoconductor at high temperature.

【００１６】以上述べた方法で得られた帯電部材は、低
硬度かつ表面平坦化に優れた特性を有し、感光体との密
着も改良される。The charging member obtained by the method described above has the characteristics of low hardness and excellent surface flatness, and the adhesion with the photoconductor is improved.

【００１７】[0017]

【実施例】以下に、実施例、比較例を示して、本発明を
具体的に説明するが、本発明は下記に限定されるもので
はない。EXAMPLES The present invention will be specifically described below with reference to examples and comparative examples, but the present invention is not limited to the following.

【００１８】「実施例１」グリセリンにプロピレンオキ
サイドとエチレンオキサイドを付加して分子量５０００
としたポリエーテルポリオールを１００部、ウレタン変
性したＭＤＩを２５部、１，４ブタンジオールを２．５
部、シリコン界面活性剤を１．５部、ジブチルチンジラ
ウレートを０．０１部、カーボンを１０部調合し、泡立
機で攪拌・混合し、金属シャフトを予めセットした円筒
形モールドに注型し、硬化させてウレタンフォームロー
ラを作製した。[Example 1] A molecular weight of 5,000 was obtained by adding propylene oxide and ethylene oxide to glycerin.
100 parts of polyether polyol, 25 parts of urethane-modified MDI, 2.5 parts of 1,4 butanediol
Parts, 1.5 parts of silicon surfactant, 0.01 parts of dibutyltin dilaurate, 10 parts of carbon were mixed, stirred and mixed with a foaming machine, and cast into a cylindrical mold in which a metal shaft was set in advance. Then, it was cured to prepare a urethane foam roller.

【００１９】塗膜形成用に、ポリエステル樹脂（東洋
紡、バイロン６３ＳＳ、ガラス転移温度７℃）にカーボ
ンを添加し塗膜状態で体積抵抗率が約１０⁷ Ωｃｍ程度
になるように調整した塗料を用意した。そして、上記に
より作製したウレタンフォームローラ上に、ディップ法
により、塗膜を１６０μｍ厚形成した帯電ローラを作製
した。このローラの、マイクロ硬度は５２度、十点平均
粗さＲｚは１．８μｍ、室温での感光体との密着は見ら
れなかった。ただし、７０度での感光体との密着はわず
かに生じていた。For forming a coating film, a coating material prepared by adding carbon to a polyester resin (Toyobo, Byron 63SS, glass transition temperature 7 ° C.) and adjusting the volume resistivity to about 10 ⁷ Ωcm in the coating film state is prepared. did. Then, on the urethane foam roller manufactured as described above, a charging roller having a coating film formed in a thickness of 160 μm by the dipping method was manufactured. This roller had a micro hardness of 52 degrees, a ten-point average roughness Rz of 1.8 μm, and no close contact with the photoreceptor at room temperature was observed. However, there was a slight adhesion to the photoconductor at 70 degrees.

【００２０】「実施例２」塗膜形成用に、ポリエステル
樹脂（東洋紡、バイロン６３ＳＳ、ガラス転移温度７
℃）にカーボンを添加し塗膜状態で体積抵抗率が約１０
⁷ Ωｃｍ程度になるように調整した塗料Ａと、共重合ナ
イロン（ＣＭ８３３）に導電性酸化チタンを添加した塗
料Ｂを用意した。実施例１で得たウレタンフォームロー
ラ上に、ディップ法により、Ａ塗料による塗膜を１６０
μｍ厚、さらにその上にＢ塗料による塗膜を１０μｍ厚
形成した帯電ローラを作製した。このローラの、マイク
ロ硬度は５１度、十点平均粗さＲｚは２．０μｍ、室温
での感光体との密着は見られなかった。７０度での感光
体との密着もなかった。[Example 2] Polyester resin (Toyobo, Byron 63SS, glass transition temperature 7
℃) added carbon, the volume resistivity of the coating film state is about 10
A paint A adjusted to about ⁷ Ωcm and a paint B prepared by adding conductive titanium oxide to copolymer nylon (CM833) were prepared. On the urethane foam roller obtained in Example 1, 160 A of the coating film of the A paint was applied by the dipping method.
A charging roller having a thickness of .mu.m, and a coating film of B coating having a thickness of 10 .mu.m formed thereon was manufactured. This roller had a micro hardness of 51 degrees, a ten-point average roughness Rz of 2.0 μm, and no adhesion with the photoconductor at room temperature was observed. There was no close contact with the photoreceptor at 70 degrees.

【００２１】「比較例１」塗膜形成用に、ポリエステル
樹脂（東洋紡、バイロンＢＸ- １００１、ガラス転移温
度−１８℃）にカーボンを添加し塗膜状態で体積抵抗率
が約１０⁷ Ωｃｍ程度になるように調整した塗料を用意
した。実施例１で得たウレタンフォームローラ上に、デ
ィップ法により、塗膜を１６０μｍ厚形成した帯電ロー
ラを作製した。このローラの、マイクロ硬度、十点平均
粗さＲｚは、べたつきがひどく測定できなかった。室温
での感光体との密着は激しく起きた。Comparative Example 1 For forming a coating film, carbon was added to a polyester resin (Toyobo, Byron BX-1001, glass transition temperature -18 ° C.) to have a volume resistivity of about 10 ⁷ Ωcm in a coating film state. A paint adjusted to be prepared was prepared. On the urethane foam roller obtained in Example 1, a charging roller having a coating film formed to a thickness of 160 μm by the dipping method was produced. The micro-hardness and ten-point average roughness Rz of this roller were extremely sticky and could not be measured. Adhesion with the photoreceptor at room temperature occurred violently.

【００２２】「比較例２」塗膜形成用に、ポリエステル
樹脂（東洋紡、バイロン２９ＸＳ、ガラス転移温度７２
℃）にカーボンを添加し塗膜状態で体積抵抗率が約１０
⁷ Ωｃｍ程度になるように調整した塗料を用意した。実
施例１で得たウレタンフォームローラ上に、ディップ法
により、塗膜を１６０μｍ厚形成した帯電ローラを作製
した。このローラの、マイクロ硬度は９０度、十点平均
粗さＲｚは２．１μｍであった。なお、取り扱い中に塗
膜にひび割れが生じてしまった。Comparative Example 2 A polyester resin (Toyobo, Byron 29XS, glass transition temperature 72
℃) added carbon, the volume resistivity of the coating film state is about 10
Prepared a paint adjusted to about ⁷ Ωcm. On the urethane foam roller obtained in Example 1, a charging roller having a coating film formed to a thickness of 160 μm by the dipping method was produced. This roller had a micro hardness of 90 degrees and a ten-point average roughness Rz of 2.1 μm. The coating film was cracked during handling.

【００２３】「比較例３」塗膜形成用に、ウレタン樹脂
にカーボンを添加し塗膜状態で体積抵抗率が約１０⁷ Ω
ｃｍ程度になるように調整した塗料を用意した。実施例
１で得たウレタンフォームローラ上に、ディップ法によ
り、塗膜を１６０μｍ厚形成した帯電ローラを作製し
た。このローラの、マイクロ硬度は６５度、十点平均粗
さＲｚは５．７μｍ、室温での感光体との密着は生じ
た。Comparative Example 3 For forming a coating film, carbon was added to urethane resin and the volume resistivity was about 10 ⁷ Ω in the coating film state.
A paint prepared to have a size of about cm was prepared. On the urethane foam roller obtained in Example 1, a charging roller having a coating film formed to a thickness of 160 μm by the dipping method was produced. This roller had a micro hardness of 65 degrees, a ten-point average roughness Rz of 5.7 μm, and adhesion with the photoreceptor at room temperature occurred.

【００２４】「比較例４」塗膜形成用に、アクリル樹脂
（三菱レーヨン、ＬＲ１９４）にカーボンを添加し塗膜
状態で体積抵抗率が約１０⁷ Ωｃｍ程度になるように調
整した塗料を用意した。実施例１で得たウレタンフォー
ムローラ上に、ディップ法により、塗膜を１６０μｍ厚
形成した帯電ローラを作製した。このローラの、マイク
ロ硬度は６５．５度、十点平均粗さＲｚは９．７μｍ、
室温での感光体との密着は生じなかった。Comparative Example 4 For coating film formation, a coating material prepared by adding carbon to acrylic resin (Mitsubishi Rayon, LR194) and adjusting the volume resistivity to about 10 ⁷ Ωcm in the coating film state was prepared. . On the urethane foam roller obtained in Example 1, a charging roller having a coating film formed to a thickness of 160 μm by the dipping method was produced. This roller has a micro hardness of 65.5 degrees and a ten-point average roughness Rz of 9.7 μm.
Adhesion to the photoreceptor did not occur at room temperature.

【００２５】[0025]

【発明の効果】本発明で、１）シャフトと、その外周に
弾性層、導電層が順次形成してなり、被帯電体に当接さ
せ、この被帯電体との間に電圧を印加することにより、
前記被帯電体を帯電させる帯電部材において、上記導電
層の主材がガラス転移温度が−１６℃以上５０℃以下の
ポリエステル樹脂である帯電部材であり、そして、２）
上記導電層の外周に形成される被覆層の主材が、ウレタ
ン変性アクリル樹脂又はナイロン樹脂である帯電部材。
更に、３）上記弾性層がフォーム体である帯電部材であ
り、そして、４）被帯電体に当接し核被帯電体を帯電さ
せる帯電部材と、被帯電体と帯電部材との間に電圧を印
加する電圧印加手段とを具備してなる帯電装置におい
て、上記１）〜３）の帯電部材を用いた帯電装置とする
ことにより、低密度でかつ表面平坦な帯電部材及びこれ
を用いた帯電装置を提供出来る。According to the present invention, 1) a shaft, an elastic layer and a conductive layer are sequentially formed on the outer circumference of the shaft, and the shaft is brought into contact with an object to be charged, and a voltage is applied between the shaft and the object. Due to
In the charging member for charging the body to be charged, the main material of the conductive layer is a polyester resin having a glass transition temperature of -16 ° C or higher and 50 ° C or lower, and 2).
A charging member in which the main material of the coating layer formed on the outer periphery of the conductive layer is a urethane-modified acrylic resin or nylon resin.
Furthermore, 3) the elastic layer is a charging member that is a foam body, and 4) a voltage is applied between the charging member that contacts the charged member and charges the nuclear charged member, and the charged member and the charging member. A charging device comprising a voltage applying means for applying a charging device using the charging member according to 1) to 3) above, and a charging member having a low density and a flat surface, and a charging device using the same. Can be provided.

【図面の簡単な説明】[Brief description of drawings]

【図１】本発明の帯電部材の一例を示す断面図である。FIG. 1 is a sectional view showing an example of a charging member of the present invention.

【符号の説明】[Explanation of symbols]

１ シャフト ２ 弾性層 ３ 導電層 ４ 被覆層 Reference Signs List 1 shaft 2 elastic layer 3 conductive layer 4 coating layer

Claims (4)

【特許請求の範囲】[Claims] 【請求項１】シャフトと、その外周に弾性層及び導電層
を順次形成してなり、被帯電体に当接させ、この被帯電
体との間に電圧を印加することにより、前記被帯電体を
帯電させる帯電部材において、上記導電層の主材が、ガ
ラス転移温度が−１６℃以上５０℃以下のポリエステル
樹脂であることを特徴とする帯電部材。1. A shaft, and an elastic layer and a conductive layer are sequentially formed on the outer periphery of the shaft. The shaft is brought into contact with a body to be charged, and a voltage is applied between the body and the body to be charged. In the charging member for charging, the main member of the conductive layer is a polyester resin having a glass transition temperature of -16 ° C or higher and 50 ° C or lower. 【請求項２】上記導電層の外周に形成される被覆層の主
材がウレタン変性アクリル樹脂又はナイロン樹脂である
ことを特徴とする請求項１記載の帯電部材。2. The charging member according to claim 1, wherein the main material of the coating layer formed on the outer periphery of the conductive layer is urethane-modified acrylic resin or nylon resin. 【請求項３】上記弾性層がフォーム体であることを特徴
とする請求項１又は２記載の帯電部材。3. The charging member according to claim 1, wherein the elastic layer is a foam body. 【請求項４】被帯電体に当接し該被帯電体を帯電させる
帯電部材と、被帯電体と帯電部材との間に電圧を印加す
る電圧印加手段とを具備してなる帯電装置において、上
記帯電部材として請求項１乃至３いずれか１項記載の帯
電部材を用いたことを特徴とする帯電装置。4. A charging device comprising: a charging member that is in contact with a member to be charged and charges the member; and a voltage applying unit that applies a voltage between the member and the charging member. A charging device comprising the charging member according to any one of claims 1 to 3 as a charging member.