JP2001305755A - Single layer type electrophotographic photoreceptor and image forming device using the same - Google Patents
Single layer type electrophotographic photoreceptor and image forming device using the sameInfo
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- JP2001305755A JP2001305755A JP2000131501A JP2000131501A JP2001305755A JP 2001305755 A JP2001305755 A JP 2001305755A JP 2000131501 A JP2000131501 A JP 2000131501A JP 2000131501 A JP2000131501 A JP 2000131501A JP 2001305755 A JP2001305755 A JP 2001305755A
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Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、電子写真式複写
機、ファクシミリ、レーザービームプリンタ等のデジタ
ル画像形成装置に用いられる単層型電子写真感光体と、
それを用いたデジタル画像形成方法とに関するものであ
る。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a single-layer type electrophotographic photosensitive member used for a digital image forming apparatus such as an electrophotographic copying machine, a facsimile, a laser beam printer, and the like.
The present invention relates to a digital image forming method using the same.
【０００２】より詳細には、除電工程を有さない反転現
像式デジタル画像形成装置において使用してもメモリー
画像が発生しない単層型電子写真感光体と、それを用い
た除電工程を有さない反転現像式デジタル画像形成方法
に関するものである。More specifically, a single-layer type electrophotographic photoreceptor which does not generate a memory image even when used in a reversal-developing digital image forming apparatus having no charge eliminating step, and having no charge eliminating step using the same The present invention relates to a reversal developing digital image forming method.
【０００３】[0003]
【従来の技術】有機感光体は、従来の無機感光体に比べ
て製造が容易であり、コストが安く、電荷輸送剤、電荷
発生剤、結着樹脂等の感光体材料の選択肢が多様で、機
能設計の自由度が高いという利点を有することから、近
年、広く用いられている。2. Description of the Related Art Organic photoreceptors are easier to manufacture than conventional inorganic photoreceptors, are inexpensive, and have a wide variety of photoreceptor materials such as charge transport agents, charge generators and binder resins. In recent years, it has been widely used because it has an advantage that the degree of freedom in functional design is high.
【０００４】有機感光体には、電荷輸送剤（ホール輸送
剤、電子輸送剤）を電荷発生剤とともに同一の感光層中
に分散させた単層型感光体と、電荷発生剤を含有する電
荷発生層と電荷輸送剤を含有する電荷輸送層とを積層し
た積層型感光体とがあり、層構成が簡単で生産性に優れ
る、層間の界面が少ないので光学的特性を向上できる、
といった利点を有するため、近年、単層型が脚光を浴び
つつある。The organic photoreceptor includes a single-layer type photoreceptor in which a charge transporting agent (a hole transporting agent and an electron transporting agent) is dispersed in the same photosensitive layer together with a charge generating agent, and a charge generating agent containing a charge generating agent. There is a laminated photoreceptor in which a layer and a charge transporting layer containing a charge transporting agent are laminated, and the layer configuration is simple and excellent in productivity.
In recent years, the single-layer type has been spotlighted.
【０００５】一方、電子写真方式を利用した画像形成装
置は、感光体を帯電し（主帯電工程）、画像露光して静
電潜像を形成し（露光工程）、この静電潜像を現像バイ
アス電圧が印加された状態でトナー現像し（現像工
程）、形成されるトナー像を転写紙に転写し（転写工
程）、定着して画像形成を行う。また、感光体上の残留
トナーはウレタンブレード等によりクリーニングされ
（クリーニング工程）、感光体上の残留電荷はＬＥＤ等
により消去される（除電工程）。On the other hand, an image forming apparatus using an electrophotographic system charges a photosensitive member (main charging step), forms an electrostatic latent image by exposing the image (exposure step), and develops the electrostatic latent image. The toner is developed with a bias voltage applied (developing step), the formed toner image is transferred onto a transfer sheet (transfer step), and fixed to form an image. Further, the residual toner on the photoconductor is cleaned by a urethane blade or the like (cleaning process), and the residual charge on the photoconductor is erased by an LED or the like (static elimination process).
【０００６】そして、画像形成装置の小型化やイニシャ
ルコストダウン等のために、前記クリーニング工程と除
電工程については省略される試みが種々なされている。Various attempts have been made to omit the cleaning step and the charge removing step in order to reduce the size of the image forming apparatus and reduce the initial cost.
【０００７】また、前記電子写真方式を利用した画像形
成装置には、デジタル及びアナログ複写機、ファクシミ
リ、レーザービームプリンタ等があり、特に帯電工程で
感光体に印加される帯電電圧と同極性のトナーを使用し
て現像する反転現像方式は、デジタル画像形成装置に広
く使用されている。The image forming apparatus using the electrophotographic method includes digital and analog copying machines, facsimile machines, laser beam printers, and the like. In particular, a toner having the same polarity as a charging voltage applied to a photosensitive member in a charging step. The reversal developing method of developing by using is widely used in digital image forming apparatuses.
【０００８】[0008]
【発明が解決しようとする課題】＜転写メモリー＞電子
写真感光体を反転現像式デジタル画像形成装置に使用し
た場合、転写工程で感光体に印加される転写電圧は、通
常、感光体に直接印加せず転写媒体（紙）を介して印加
され、転写媒体が転写工程を通過しないときは印加され
ない。<Transfer Memory> When an electrophotographic photosensitive member is used in a reversal-developing digital image forming apparatus, the transfer voltage applied to the photosensitive member in the transfer step is usually directly applied to the photosensitive member. Instead, the voltage is applied via the transfer medium (paper), and is not applied when the transfer medium does not pass through the transfer step.
【０００９】しかしながら、転写電圧の入切タイミング
は非常に困難で、転写媒体の先後端部については感光体
に直接印加される部分が発生してしまうことが多い。す
なわち、転写媒体の先端が転写装置を覆う前に、転写電
圧が印加され始め、また、転写媒体の後端の通過により
転写装置の一部が露出されてもなお、転写電圧が印加さ
れ続けるため、当該部分は前記感光体に転写電圧が直接
印加されるのである。However, it is very difficult to turn on and off the transfer voltage, and the front and rear ends of the transfer medium often have portions directly applied to the photosensitive member. That is, before the leading end of the transfer medium covers the transfer device, the transfer voltage starts to be applied, and the transfer voltage continues to be applied even when a part of the transfer device is exposed by the passage of the rear end of the transfer medium. In this portion, a transfer voltage is directly applied to the photosensitive member.
【００１０】このため、例えば正帯電単層型感光体の場
合、転写装置で印加される電圧の極性は負であるため、
負電圧が印加された感光体部分には負の空間電荷が残存
してしまう。一般に、単層型感光体は両極性に感度を有
するため、次の除電工程において負の空間電荷が消去さ
れる。For this reason, for example, in the case of a positively charged single-layer type photoreceptor, the polarity of the voltage applied by the transfer device is negative.
Negative space charges remain in the photoconductor portion to which the negative voltage is applied. In general, since the single-layer type photoconductor has sensitivity to both polarities, negative space charges are erased in the next neutralization step.
【００１１】ところが、前記正帯電単層型感光体の負極
性に対する感度が非常に悪い（電子輸送剤の移動度が極
端に小さい）場合や、除電工程を有さない画像形成装置
において使用する場合には、負の空間電荷が十分に消去
されず、次の帯電工程で正帯電されても空間電荷の影響
で電位低下が引き起こされ、更に現像工程においては感
度差となって現れ、画像中では当該部分が黒くなる（メ
モリー画像）という問題が発生する。However, when the sensitivity of the positively charged single-layer type photoreceptor to the negative polarity is extremely poor (the mobility of the electron transporting agent is extremely small), or when the photoreceptor is used in an image forming apparatus having no charge removing step. In the case, the negative space charge is not sufficiently erased, and even if it is positively charged in the next charging step, a potential drop is caused by the influence of the space charge, furthermore, it appears as a sensitivity difference in the developing step, and in the image, This causes a problem that the portion becomes black (memory image).
【００１２】＜露光メモリー＞例えば、正帯電単層型感
光体は、露光工程、現像工程を経て、通常は、除電工程
で一様に感光体表面の正電荷が消去された後、次帯電工
程において均一に正帯電される。<Exposure Memory> For example, a positively charged single-layer type photoreceptor generally undergoes an exposure step and a development step, and usually after the positive charge on the surface of the photoreceptor is uniformly erased in a charge elimination step, a subsequent charging step is performed. Is positively charged uniformly.
【００１３】しかし、転写メモリーの場合と同様に、前
記正帯電単層型感光体の負極性に対する感度が悪い場合
や、除電工程を有さない画像形成装置において使用する
場合には、露光部分の方が非露光部分に比較して負の空
間電荷密度が大きく、次帯電工程で電位差が生じ、メモ
リー画像が発生し易くなる。However, as in the case of the transfer memory, if the sensitivity of the positively charged single-layer type photoreceptor to the negative polarity is poor, or if the photoreceptor is used in an image forming apparatus having no charge removing step, the exposed portion of the photoreceptor is not exposed. As compared with the non-exposed portion, the negative space charge density is larger, a potential difference occurs in the next charging step, and a memory image is easily generated.
【００１４】そこで、本発明の目的は、除電工程を有さ
ない反転現像式デジタル画像形成装置に使用しても、露
光メモリー及び転写メモリーが非常に小さく、メモリー
画像の発生しない単層型電子写真感光体を提供すること
である。Accordingly, an object of the present invention is to provide a single-layer type electrophotographic apparatus in which an exposure memory and a transfer memory are very small and a memory image is not generated even when used in a reversal developing type digital image forming apparatus having no charge removing step. It is to provide a photoreceptor.
【００１５】更には、本発明の単層型電子写真感光体を
使用した除電工程を有さない反転現像式デジタル画像形
成装置を提供することである。Still another object of the present invention is to provide a reversal-developing digital image forming apparatus using the single-layer electrophotographic photosensitive member of the present invention and having no charge removing step.
【００１６】[0016]
【課題を解決するための手段】本発明者らは鋭意研究の
結果、上記目的を達成するために、導電性基体上に感光
層を形成し、前記感光層が、電荷発生剤としてフタロシ
アニン系化合物、及びホール輸送剤、電子輸送剤をバイ
ンダー樹脂中に含有し、且つ、露光波長７８０ｎｍ、露
光エネルギー１．０μＪ／ｃｍ2で測定した、プラス極
性とマイナス極性の感度の絶対値差が５００Ｖ以下であ
る単層型電子写真感光体が、露光メモリー及び転写メモ
リーが非常に小さく、除電工程を有さない反転現像デジ
タル式画像形成システムにおいてもメモリー画像が発生
しない事実を見出した。Means for Solving the Problems As a result of intensive studies, the present inventors have formed a photosensitive layer on a conductive substrate in order to achieve the above object, and the photosensitive layer has a phthalocyanine compound as a charge generating agent. And a hole transport agent and an electron transport agent are contained in a binder resin, and the absolute value difference between the positive and negative polar sensitivities measured at an exposure wavelength of 780 nm and an exposure energy of 1.0 μJ / cm 2 is 500 V or less. It has been found that a single-layer type electrophotographic photoreceptor has a very small exposure memory and transfer memory, and does not generate a memory image even in a reversal-developed digital image forming system having no charge removing step.
【００１７】[0017]
【発明の作用】請求項１記載のように、露光波長７８０
ｎｍ、露光エネルギー１．０μＪ／ｃｍ2で測定した、
プラス極性とマイナス極性の感度の絶対値差が５００Ｖ
以下である単層型電子写真感光体を使用すると、露光メ
モリー及び転写メモリーが非常に小さい。これは、プラ
ス極性とマイナス極性の感度の絶対値差が小さいほど、
感光層中で発生したホールと電子の輸送バランスが良好
となりメモリーが小さくなるためと考えられる。According to the present invention, the exposure wavelength is 780.
nm, the exposure energy was measured at 1.0 μJ / cm 2 ,
Absolute value difference between sensitivity of plus polarity and minus polarity is 500V
When the following single-layer electrophotographic photosensitive member is used, the exposure memory and the transfer memory are very small. This means that the smaller the absolute value difference between the positive and negative polar sensitivities,
This is considered to be because the transport balance between holes and electrons generated in the photosensitive layer becomes good and the memory becomes small.
【００１８】請求項２記載のように、上記単層型電子写
真感光体において、移動度の大きな電子輸送剤の材料設
計が困難で、電子輸送材料の移動度がホール輸送材料の
移動度に比較して小さいこと、画像形成装置内でのオゾ
ンの発生が極めて少ないこと等の理由により、プラス極
性感度の絶対値がマイナス極性感度の絶対値より小さ
い、すなわち正帯電型が主流となっている。In the single-layer type electrophotographic photoreceptor, it is difficult to design the material of the electron transporting agent having high mobility, and the mobility of the electron transporting material is compared with the mobility of the hole transporting material. For example, the absolute value of the positive polarity sensitivity is smaller than the absolute value of the negative polarity sensitivity, that is, the positive charging type is mainly used because of its small size and the extremely low generation of ozone in the image forming apparatus.
【００１９】請求項３、４記載のように、正帯電単層型
電子写真感光体において、ホール輸送剤として、一般式
（１）で示される化合物を含有することが好ましく、電
子輸送剤として、一般式（２）、（３）、（４）または
（５）で示される化合物を、少なくとも１種以上含有す
ることが好ましい。これは、ホール輸送能力または電子
輸送能力の高い前記化合物を使用することにより、正極
性及び負極性に対する感度が良好となり、メモリー低減
に非常に効果的なためである。According to a third aspect of the present invention, in the positively charged single-layer type electrophotographic photoreceptor, the hole transporting agent preferably contains a compound represented by the general formula (1). It is preferable that at least one compound represented by the general formula (2), (3), (4) or (5) is contained. This is because by using the compound having a high hole transporting ability or electron transporting ability, the sensitivity to the positive polarity and the negative polarity is improved, which is very effective in reducing the memory.
【００２０】請求項５記載のように、除電工程を有さな
い反転現像式デジタル画像形成装置に使用しても、本発
明の単層型電子写真感光体はメモリーが非常に小さいた
め、メモリー画像の発生は無い。Even when used in a reversal-developing digital image forming apparatus having no charge removing step, the single-layer type electrophotographic photoreceptor of the present invention has a very small memory. There is no occurrence.
【００２１】[0021]
【発明の実施形態】本発明の単層型電子写真感光体に用
いられる種々の材料について詳細に説明する。DESCRIPTION OF THE PREFERRED EMBODIMENTS Various materials used for the single-layer electrophotographic photosensitive member of the present invention will be described in detail.
【００２２】＜電荷発生剤＞デジタル画像形成装置にお
いて、レーザを光源とする場合、小型・安価・簡便さ等
の点から、多くは半導体レーザ、ＬＥＤが使用される。
従って、少なくとも７００〜８５０ｎｍの波長領域に感
度を有する有機感光体が必要である。前記要求を満た
す、有機感光体に使用される電荷発生剤として、例え
ば、多環キノン化合物、ピリリウム化合物、スクエアリ
ウム化合物、フタロシアニン系化合物、アゾ化合物等が
提案または実用化されているが、本発明の単層型電子写
真感光体には、種々のフタロシアニン系化合物が使用さ
れる。<Charge Generating Agent> In a digital image forming apparatus, when a laser is used as a light source, semiconductor lasers and LEDs are often used from the viewpoints of small size, low cost, and simplicity.
Therefore, an organic photoreceptor having sensitivity at least in a wavelength region of 700 to 850 nm is required. As the charge generator used in the organic photoreceptor satisfying the above requirements, for example, polycyclic quinone compounds, pyrylium compounds, squarium compounds, phthalocyanine compounds, azo compounds and the like have been proposed or put into practical use. Various phthalocyanine compounds are used in the single-layer type electrophotographic photoreceptor.
【００２３】一般的にフタロシニン系化合物には、中心
金属を有さないメタルフリーフタロシニン（ＣＧＭ−
1）と、近年研究開発が活発に行われているチタニルフ
タロシアニン（ＣＧＭ−２）、及び、アルミニウムフタ
ロシアニン、バナジウムフタロシニン、カドミウムフタ
ロシアニン、アンチモンフタロシニン、クロムフタロシ
ニン、銅４−フタロシニン、ゲルマニウムフタロシニ
ン、鉄フタロシニン、クロロアルミニウムフタロシニ
ン、クロロインジウムフタロシアニン、クロロガリウム
フタロシニン、マグネシウムフタロシニン、ジアルキル
フタロシニン、テトラメチルフタロシニン、テトラフェ
ニルフタロシニン等の中心金属を有する金属フタロシア
ニンとがあり、またα型、β型、γ型、δ型、ε型、σ
型、ｘ型、τ型等の結晶型のものがある。In general, phthalosinine-based compounds include metal-free phthalosinins having no central metal (CGM-
1) and titanyl phthalocyanine (CGM-2), which has been actively researched and developed in recent years, and aluminum phthalocyanine, vanadium phthalocyanine, cadmium phthalocyanine, antimony phthalosinine, chromium phthalosinine, copper 4-phthalosinine, and germanium phthalosinine Metal phthalocyanine having a central metal such as iron phthalosinine, chloroaluminum phthalosinine, chloroindium phthalocyanine, chlorogallium phthalosinine, magnesium phthalosinine, dialkylphthalosinine, tetramethylphthalosinine, tetraphenylphthalosinine, and α-type. , Β type, γ type, δ type, ε type, σ
There are crystal types such as type, x type and τ type.
【００２４】＜ＣＧＭ−１＞<CGM-1>
【化６】 Embedded image
【００２５】＜ＣＧＭ−２＞<CGM-2>
【化７】 Embedded image
【００２６】上記フタロシアニン系化合物は、バインダ
ー樹脂重量に対して０．０１〜５０ｗｔ％、更には０．
１〜３０ｗｔ％含有することが好ましい。The phthalocyanine-based compound is used in an amount of 0.01 to 50% by weight, preferably 0.1 to 50% by weight, based on the weight of the binder resin.
It is preferable to contain 1-30 wt%.
【００２７】＜ホール輸送剤＞本発明の単層型電子写真
感光体に用いられるホール輸送剤としては、特に一般式
（１）で示されるスチルベン系化合物が好適に使用され
る。また、ホール輸送剤として、該スチルベン系化合物
を使用する場合、単独、または少なくとも１種以上含有
すればよい。すなわち該スチルベン系化合物と共に、種
々のホール輸送剤を含有していてもよい。<Hole Transport Agent> As the hole transport agent used in the single-layer type electrophotographic photoreceptor of the present invention, a stilbene compound represented by the general formula (1) is particularly preferably used. When the stilbene compound is used as a hole transporting agent, it may be used alone or in at least one kind. That is, various hole transporting agents may be contained together with the stilbene compound.
【００２８】種々のホール輸送剤としては、例えば２，
５−ジ（４−メチルアミノフェニル）−１，３，４−オ
キサジアゾール等のオキサジアゾール系の化合物、９−
４（−ジエチルアミノスチリル）アントラセン等のスチ
リル系化合物、ポリビニルカルバゾール等のカルバゾー
ル系化合物、有機ポリシラン化合物、１−フェニル−３
（p−ジメチルアミノフェニル）ピラゾリン等のピラゾ
リン系化合物、ヒドラゾン系化合物、トリフェニルアミ
ン系化合物、インドール系化合物、オキサゾール系化合
物、イソオキサゾール系化合物、チアゾール系化合物、
チアジアゾール系化合物、イミダゾール系化合物、ピラ
ゾール系化合物、トリアゾール系化合物等の含窒素環式
化合物等があげられる。Various hole transporting agents include, for example,
Oxadiazole compounds such as 5-di (4-methylaminophenyl) -1,3,4-oxadiazole, 9-
Styryl compounds such as 4 (-diethylaminostyryl) anthracene, carbazole compounds such as polyvinylcarbazole, organic polysilane compounds, 1-phenyl-3
Pyrazoline compounds such as (p-dimethylaminophenyl) pyrazoline, hydrazone compounds, triphenylamine compounds, indole compounds, oxazole compounds, isoxazole compounds, thiazole compounds,
Examples include nitrogen-containing cyclic compounds such as thiadiazole compounds, imidazole compounds, pyrazole compounds, and triazole compounds.
【００２９】ホール輸送剤の含有量は、バインダー樹脂
重量に対して５〜５００ｗｔ％、更には２５〜２００ｗ
ｔ％が好ましい。The content of the hole transporting agent is 5 to 500 wt% based on the weight of the binder resin, and more preferably 25 to 200 watts.
t% is preferred.
【００３０】＜電子輸送剤＞本発明の単層型電子写真感
光体に用いられる電子輸送剤としては、特に一般式
（２）、（３）、（４）または（５）で示されるキノン
系化合物が好適に使用される。また、電子輸送剤とし
て、該キノン系化合物を使用する場合、単独、または少
なくとも１種以上含有すればよい。すなわち該キノン系
化合物と共に、種々の電子輸送剤を含有していてもよ
い。<Electron Transport Agent> As the electron transport agent used in the single-layer type electrophotographic photoreceptor of the present invention, quinone-based compounds represented by formulas (2), (3), (4) and (5) are particularly preferred. Compounds are preferably used. When the quinone-based compound is used as an electron transporting agent, it may be used alone, or at least one kind may be contained. That is, various electron transporting agents may be contained together with the quinone compound.
【００３１】種々の電子輸送剤としては、例えばピレン
系化合物、カルバゾール系化合物、ヒドラゾン系化合
物、Ｎ，Ｎ−ジアルキルアニリン系化合物、ジフェニル
アミン系化合物、トリフェニルアミン系化合物、トリフ
ェニルメタン系化合物、テトラシアノエチル、テトラシ
アノキノジメタン、クロルアニル、ブロモアニル、２,
４,７−トリニトロ−９−フルオレノン、２,４,５,７−
テトラニトロ−９−フルオレノン、２,４,７−トリニト
ロ−９−ジシアノメチレンフルオレノン、２,４,５,７
−テトラニトロキサントン、２,４,８−トリニトロチオ
キサントン等の電子吸引性物質、あるいはこれらの電子
吸引性物質を高分子化したもの等があげられる。Various electron transporting agents include, for example, pyrene compounds, carbazole compounds, hydrazone compounds, N, N-dialkylaniline compounds, diphenylamine compounds, triphenylamine compounds, triphenylmethane compounds, and tetraphenylmethane compounds. Cyanoethyl, tetracyanoquinodimethane, chloranil, bromoanil, 2,
4,7-trinitro-9-fluorenone, 2,4,5,7-
Tetranitro-9-fluorenone, 2,4,7-trinitro-9-dicyanomethylenefluorenone, 2,4,5,7
And electron-withdrawing substances such as -tetranitroxanthone, 2,4,8-trinitrothioxanthone, and those obtained by polymerizing these electron-withdrawing substances.
【００３２】電子輸送剤の含有量は、バインダー樹脂重
量に対して５〜１００ｗｔ％、更には１０〜８０ｗｔ％
が好ましい。The content of the electron transporting agent is 5 to 100% by weight, more preferably 10 to 80% by weight based on the weight of the binder resin.
Is preferred.
【００３３】＜バインダー樹脂＞前記各成分を分散させ
るためのバインダー樹脂は、従来から感光層に使用され
ている種々の樹脂を使用することができる。<Binder Resin> As the binder resin for dispersing the above components, various resins conventionally used in the photosensitive layer can be used.
【００３４】例えば、スチレン−ブタジエン共重合体、
スチレン−アクリロニトリル共重合体、スチレン−マレ
イン酸共重合体、アクリル共重合体、スチレン−アクリ
ル酸共重合体、ポリエチレン、エチレン−酢酸ビニル共
重合体、塩素化ポリエチレン、ポリ塩化ビニル、ポリプ
ロピレン、アイオノマー、塩化ビニル−酢酸ビニル共重
合体、ポリエステル、アルキド樹脂、ポリアミド、ポリ
ウレタン、ポリカーボネート、ポリアリレート、ポリス
ルホン、ジアリルフタレート樹脂、ケトン樹脂、ポリビ
ニルブチラール樹脂、ポリエーテル樹脂等の熱可塑性樹
脂、シリコーン樹脂、エポキシ樹脂、フェノール樹脂、
尿素樹脂、メラミン樹脂、その他架橋性の熱硬化性樹
脂、エポキシアクリレート、ウレタン−アクリレート等
の光硬化型樹脂等の樹脂が使用可能である。これらのバ
インダー樹脂は単独または二種類以上をブレンドして使
用できる。For example, styrene-butadiene copolymer,
Styrene-acrylonitrile copolymer, styrene-maleic acid copolymer, acrylic copolymer, styrene-acrylic acid copolymer, polyethylene, ethylene-vinyl acetate copolymer, chlorinated polyethylene, polyvinyl chloride, polypropylene, ionomer, Thermoplastic resin such as vinyl chloride-vinyl acetate copolymer, polyester, alkyd resin, polyamide, polyurethane, polycarbonate, polyarylate, polysulfone, diallyl phthalate resin, ketone resin, polyvinyl butyral resin, polyether resin, silicone resin, epoxy resin , Phenolic resin,
Resins such as urea resins, melamine resins, other cross-linkable thermosetting resins, and photo-curing resins such as epoxy acrylate and urethane-acrylate can be used. These binder resins can be used alone or as a blend of two or more.
【００３５】特に好適な樹脂は、帝人化成（株）社製パ
ンライト、三菱瓦斯化学（株）社製ＰＣＺ等のビスフェ
ノールＺ型モノマーとホスゲンとから誘導されるビスフ
ェノールＺ型ポリカーボネートである。Particularly preferred resins are bisphenol Z-type polycarbonates derived from bisphenol Z-type monomers such as Panlite manufactured by Teijin Chemicals Ltd. and PCZ manufactured by Mitsubishi Gas Chemical Co., Ltd. and phosgene.
【００３６】前記例のバインダー樹脂の重量平均分子量
は５，０００〜２００，０００、更には１５，０００〜
１００，０００が好ましい。The binder resin of the above example has a weight average molecular weight of 5,000 to 200,000, more preferably 15,000 to 200,000.
100,000 is preferred.
【００３７】本発明の単層型電子写真感光体には、前記
各成分のほかに、電子写真特性に悪影響を与えない範囲
で、従来公知の種々の添加剤、例えば、酸化防止剤、ラ
ジカル補足剤、一重項クエンチャー、紫外線吸収剤等の
劣化防止剤、軟化剤、可塑剤、表面改質剤、増量剤、増
粘剤、分散安定剤、ワックス、アクセプター、ドナー等
を配合することができる。また、感光層の感度を向上さ
せるために、例えば、テルフェニル、ハロナフトナフト
キノン類、アセナフチレン等の公知の増感剤を電荷発生
剤と併用してもよい。The single-layer type electrophotographic photoreceptor of the present invention may contain, in addition to the above-mentioned components, various conventionally known additives such as an antioxidant and a radical scavenger as long as the electrophotographic characteristics are not adversely affected. Agents, singlet quenchers, deterioration inhibitors such as ultraviolet absorbers, softeners, plasticizers, surface modifiers, extenders, thickeners, dispersion stabilizers, waxes, acceptors, donors, etc. . Further, in order to improve the sensitivity of the photosensitive layer, a known sensitizer such as terphenyl, halonaphthonaphthoquinones, acenaphthylene and the like may be used in combination with the charge generator.
【００３８】本発明の単層型電子写真感光体において
は、導電性基体と感光層との間に、感光体の特性を阻害
しない範囲でバリア層が形成されていてもよい。In the single-layer type electrophotographic photosensitive member of the present invention, a barrier layer may be formed between the conductive substrate and the photosensitive layer as long as the characteristics of the photosensitive member are not impaired.
【００３９】本発明の単層型電子写真感光体の膜厚は５
〜５０μｍ、特に１５〜３５μｍが好ましい。The single-layer electrophotographic photosensitive member of the present invention has a thickness of 5
To 50 μm, particularly preferably 15 to 35 μm.
【００４０】単層型電子写真感光体は、導電性基体上に
単一の感光層を設けたものである。この感光層は、電荷
発生剤、ホール輸送剤、電子輸送剤、バインダー樹脂等
を適当な溶媒に溶解または分散させ、得られた塗布液を
導電性基体上に塗布し、乾燥させることで形成される。The single-layer type electrophotographic photosensitive member has a single photosensitive layer provided on a conductive substrate. This photosensitive layer is formed by dissolving or dispersing a charge generating agent, a hole transporting agent, an electron transporting agent, a binder resin, and the like in an appropriate solvent, applying the obtained coating solution on a conductive substrate, and drying. You.
【００４１】上記感光層が形成される導電性基体として
は、導電性を有する種々の材料を使用することができ、
例えば、鉄、アルミニウム、銅、スズ、白金、銀、バナ
ジウム、モリブデン、クロム、カドミウム、チタン、ニ
ッケル、パラジウム、インジウム、ステンレス鋼、真鍮
等の金属単体や、上記金属が蒸着またはラミネートされ
たプラスチック材料、ヨウ化アルミニウム、酸化スズ、
酸化インジウム等で被覆されたガラス等があげられる。As the conductive substrate on which the photosensitive layer is formed, various materials having conductivity can be used.
For example, simple metals such as iron, aluminum, copper, tin, platinum, silver, vanadium, molybdenum, chromium, cadmium, titanium, nickel, palladium, indium, stainless steel, and brass, and plastic materials on which the above metals are deposited or laminated , Aluminum iodide, tin oxide,
Glass coated with indium oxide or the like can be given.
【００４２】導電性基体の形状は、使用する画像形成装
置の構造に合わせて、シート状、ドラム状等のいずれで
あってもよく、基体自体が導電性を有するか、あるいは
基体の表面が導電性を有していればよい。また、導電性
基体は、使用に際して十分な機械的強度を有するものが
好ましい。The shape of the conductive substrate may be sheet-like or drum-like depending on the structure of the image forming apparatus to be used. The substrate itself has conductivity or the surface of the substrate has conductivity. What is necessary is just to have the property. The conductive substrate preferably has a sufficient mechanical strength when used.
【００４３】前記感光層を塗布の方法により形成する場
合には、前記例示のホール輸送剤、電荷発生剤、電子受
容体、結着樹脂等を適当な溶剤とともに、公知の方法、
例えば、ロールミル、ボールミル、アトライタ、ペイン
トシェーカー、超音波分散機等を用いて分散混合して分
散液を調整し、これを公知の手段により塗布して乾燥さ
せればよい。When the photosensitive layer is formed by a coating method, the hole transporting agent, the charge generating agent, the electron acceptor, the binder resin and the like described above together with a suitable solvent are used in a known method.
For example, a dispersion may be prepared by dispersing and mixing using a roll mill, a ball mill, an attritor, a paint shaker, an ultrasonic disperser, or the like, and the dispersion may be applied by a known means and dried.
【００４４】上記分散液を作製するための溶剤として
は、種々の有機溶剤が使用可能であり、例えば、メタノ
ール、エタノール、イソプロパノール、ブタノール等の
アルコール類、n−ヘキサン、オクタン、シクロヘキサ
ン等の脂肪族系炭化水素、ベンゼン、トルエン、キシレ
ン等の芳香族系炭化水素、ジクロロメタン、ジクロロエ
タン、クロロホルム、四塩化炭素、クロロベンゼン等の
ハロゲン化炭化水素、ジメチルエーテル、ジエチルエー
テル、テトラヒドロフラン、エチレングリコールジメチ
ルエーテル、ジエチレングリコールジメチルエーテル等
のエーテル類、アセトン、メチルエチルケトン、シクロ
ヘキサノン等のケトン類、酢酸エチル、酢酸メチル等の
エステル類、ジメチルホルムアルデヒド、ジメチルホル
ムアミド、ジメチルスルホキシド等があげられる。これ
らの溶剤は単独で、または２種以上混合して用いられ
る。Various organic solvents can be used as a solvent for preparing the dispersion, for example, alcohols such as methanol, ethanol, isopropanol and butanol, and aliphatic solvents such as n-hexane, octane and cyclohexane. Hydrocarbons, aromatic hydrocarbons such as benzene, toluene, and xylene; halogenated hydrocarbons such as dichloromethane, dichloroethane, chloroform, carbon tetrachloride, and chlorobenzene; dimethyl ether, diethyl ether, tetrahydrofuran, ethylene glycol dimethyl ether, and diethylene glycol dimethyl ether. Ethers, ketones such as acetone, methyl ethyl ketone and cyclohexanone, esters such as ethyl acetate and methyl acetate, dimethylformaldehyde, dimethylformamide, dimethyls Rufoxide and the like. These solvents are used alone or in combination of two or more.
【００４５】更に、ホール輸送剤、電荷発生剤、電子受
容体の分散性、感光層表面の平滑性を良くするために、
界面活性剤、レベリング剤等を使用してもよい。Further, in order to improve the dispersibility of the hole transporting agent, the charge generating agent, the electron acceptor, and the smoothness of the photosensitive layer surface,
Surfactants, leveling agents and the like may be used.
【００４６】一方、本発明の画像形成装置は、請求項１
記載の単層型電子写真感光体を使用し、該感光体の進行
方向に沿って、少なくとも主帯電工程、露光工程、現像
工程、転写工程とを備え、前記転写工程で印加される電
圧は、帯電工程で印加される電圧とは逆極性であること
を特徴とする除電工程を有さない反転現像式デジタル画
像形成装置であり、デジタル複写機、ファクシミリ、レ
ーザービームプリンタ等が挙げられる。On the other hand, the image forming apparatus of the present invention has the following features.
Using the single-layer type electrophotographic photoreceptor described, along the traveling direction of the photoreceptor, at least a main charging step, an exposure step, a developing step, a transfer step, the voltage applied in the transfer step, This is a reversal-developing digital image forming apparatus having no charge removing step characterized by having a polarity opposite to the voltage applied in the charging step, and examples thereof include a digital copying machine, a facsimile, and a laser beam printer.
【００４７】本発明の単層型電子写真感光体は、転写・
露光メモリーが非常に小さいため、除電工程を有さない
前記画像形成装置に使用してもメモリー画像が発生する
ことはない。The single-layer type electrophotographic photoreceptor of the present invention
Since the exposure memory is very small, a memory image does not occur even when used in the image forming apparatus having no charge removing step.
【００４８】また前述のように、画像形成装置の小型化
やイニシャルコストダウン等のために、クリーニング工
程は除電工程と同様に省略される場合がある。As described above, the cleaning step may be omitted as in the case of the charge removing step in order to reduce the size of the image forming apparatus and reduce the initial cost.
【００４９】[0049]
【実施例】以下、実施例、比較例をあげて本発明を説明
する。なお、以下の実施形態は本発明を具体化した一例
であって、本発明の技術的範囲を限定するものではな
い。The present invention will be described below with reference to examples and comparative examples. Note that the following embodiments are merely examples embodying the present invention, and do not limit the technical scope of the present invention.
【００５０】＜実施例１〜８＞電荷発生剤としてＸ型無
金属フタロシアニン（ＣＧＭ−１）２．５重量部、一般
式（１）で示されるホール輸送剤（ＨＴＭ−１）６５重
量部、一般式（２）、（３）、（４）、（５）で示され
る電子輸送剤（ＥＴＭ−１〜ＥＴＭ−８）３５重量部、
及びバインダー樹脂として重量平均分子量３０，０００
のｂｉｓ−Ｚ型ポリカーボネート樹脂１００重量部、及
びテトラヒドロフラン７５０重量部を、ボールミル中で
２８時間分散あるいは溶解させ、単層型感光層用塗布液
を調合した。そして、この塗布液を、支持体としてのア
ルミニウム素管上にディップコート法にて塗布し、１３
０℃、３０分間の熱風乾燥を行い、膜厚２２μｍの単一
感光層を有する単層型感光体を作製した。<Examples 1 to 8> 2.5 parts by weight of X-type metal-free phthalocyanine (CGM-1) as a charge generating agent, 65 parts by weight of a hole transporting agent (HTM-1) represented by the general formula (1), 35 parts by weight of electron transporting agents (ETM-1 to ETM-8) represented by the general formulas (2), (3), (4) and (5);
And a weight average molecular weight of 30,000 as a binder resin
Of a bis-Z type polycarbonate resin and 750 parts by weight of tetrahydrofuran were dispersed or dissolved in a ball mill for 28 hours to prepare a coating solution for a single-layer photosensitive layer. Then, this coating solution was applied on an aluminum tube as a support by a dip coating method.
Hot air drying was performed at 0 ° C. for 30 minutes to produce a single-layer photoreceptor having a single photosensitive layer having a thickness of 22 μm.
【００５１】＜比較例１〜３＞電子輸送剤としてＥＴＭ
−９〜ＥＴＭ−１１を使用した以外は実施例１〜７と同
様に単層型感光体を作製した。Comparative Examples 1 to 3 ETM as an electron transporting agent
Except that -9 to ETM-11 were used, a single-layer type photoreceptor was produced in the same manner as in Examples 1 to 7.
【００５２】＜ＨＴＭ−１＞<HTM-1>
【化８】 Embedded image
【００５３】＜ＥＴＭ−１＞<ETM-1>
【化９】 Embedded image
【００５４】＜ＥＴＭ−２＞<ETM-2>
【化１０】 Embedded image
【００５５】＜ＥＴＭ−３＞<ETM-3>
【化１１】 Embedded image
【００５６】＜ＥＴＭ−４＞<ETM-4>
【化１２】 Embedded image
【００５７】＜ＥＴＭ−５＞<ETM-5>
【化１３】 Embedded image
【００５８】＜ＥＴＭ−６＞<ETM-6>
【化１４】 Embedded image
【００５９】＜ＥＴＭ−７＞<ETM-7>
【化１５】 Embedded image
【００６０】＜ＥＴＭ−８＞<ETM-8>
【化１６】 Embedded image
【００６１】＜ＥＴＭ−９＞<ETM-9>
【化１７】 Embedded image
【００６２】＜ＥＴＭ−１０＞<ETM-10>
【化１８】 Embedded image
【００６３】＜ＥＴＭ−１１＞<ETM-11>
【化１９】 Embedded image
【００６４】＜実施例９〜１６＞電荷発生剤としてチタ
ニルフタロシアニン（ＣＧＭ−２）を使用した以外は、
実施例１〜８と同様に単層型感光体を作製した。Examples 9 to 16 Except that titanyl phthalocyanine (CGM-2) was used as the charge generating agent,
A single-layer photoreceptor was produced in the same manner as in Examples 1 to 8.
【００６５】＜比較例４〜６＞電荷発生剤としてチタニ
ルフタロシアニン（ＣＧＭ−２）を使用した以外は、比
較例１〜３と同様に単層型感光体を作製した。<Comparative Examples 4 to 6> Single-layer photosensitive members were prepared in the same manner as in Comparative Examples 1 to 3, except that titanyl phthalocyanine (CGM-2) was used as the charge generator.
【００６６】上記各実施例、比較例の単層型電子写真感
光体について、下記の各特性を評価した。評価結果を表
１、２に示した。また、これらのデータのうち、転写メ
モリー電位、露光メモリー電位と、プラス極性感度とマ
イナス極性感度の絶対値差との関係を図１に示した。The following characteristics were evaluated for the single-layer type electrophotographic photosensitive members of the above Examples and Comparative Examples. The evaluation results are shown in Tables 1 and 2. FIG. 1 shows the relationship between the transfer memory potential and the exposure memory potential among these data and the absolute value difference between the positive polarity sensitivity and the negative polarity sensitivity.
【００６７】＜プラス極性感度評価＞ジェンテック（Ｇ
ＥＮＴＥＣ）社製のドラム感度試験機（商品名ジェンテ
ックシンシア３０Ｍ）を用いて、各実施例、比較例の電
子写真感光体に印加電圧を加えて、その表面を＋８００
Ｖに帯電させた。次に、上記試験機の露光光源であるハ
ロゲンランプの白色光からバンドパスフィルターを用い
て取り出した波長７８０ｎｍの単色光（半値幅２０ｎ
ｍ，光強度２０μＷ）を、上記帯電状態の感光体の表面
に露光（露光時間１００ｍｓｅｃ）した（露光エネルギ
ーは１．０μＪ／ｃｍ2）。そして、露光開始時点から
５００ｍｓｅｃ経過した時点での表面電位を露光後電位
ＶLP（Ｖ）として測定した。すなわち、露光後電位が小
さいほど感光体は高感度である。<Evaluation of Positive Polarity Sensitivity> Gentec (G
Using a drum sensitivity tester (trade name: Gentec Cynthia 30M) manufactured by Entec Co., Ltd., an applied voltage was applied to the electrophotographic photoreceptors of the respective examples and comparative examples, and the surfaces thereof were +800.
V was charged. Next, monochromatic light having a wavelength of 780 nm (half-width 20n) extracted from white light of a halogen lamp as an exposure light source of the tester using a bandpass filter.
m, light intensity 20 μW) was exposed (exposure time 100 msec) to the surface of the charged photoreceptor (exposure energy was 1.0 μJ / cm 2 ). Then, the surface potential at the time when 500 msec had elapsed from the start of the exposure was measured as the post-exposure potential V LP (V). That is, the smaller the potential after exposure, the higher the sensitivity of the photoconductor.
【００６８】＜マイナス極性感度評価＞ジェンテック
（ＧＥＮＴＥＣ）社製のドラム感度試験機（商品名ジェ
ンテックシンシア３０Ｍ）を用いて、各実施例、比較例
の電子写真感光体に印加電圧を加えて、その表面を−８
００Ｖに帯電させた以外は、前記＜プラス極性感度評価
＞と同様に、露光開始時点から５００ｍｓｅｃ経過した
時点での表面電位を露光後電位ＶLN（Ｖ）として測定し
た。<Evaluation of Negative Polarity Sensitivity> Using a drum sensitivity tester (trade name: Gentec Cynthia 30M) manufactured by GENTEC, a voltage was applied to the electrophotographic photosensitive members of the respective examples and comparative examples. -8
The surface potential at the time when 500 msec had elapsed from the start of exposure was measured as the post-exposure potential V LN (V) in the same manner as in <Evaluation of Positive Polarity Sensitivity> except that the surface was charged to 00V.
【００６９】＜転写メモリー電位評価＞除電ランプを取
除いた京セラミタ（株）社製マルチファンクションプリ
ンタＡｎｔｉｃｏ４０に、各実施例、比較例の電子写真
感光体を搭載し、転写バイアスを印加しない時の表面電
位、及び転写バイアス印加時の次帯電工程後の表面電位
を測定し、その差異を転写メモリー電位とした。転写メ
モリー電位については、転写メモリー画像の発生しない
４５Ｖ以下を可、４５Ｖより大きい場合を不可とした。<Evaluation of Transfer Memory Potential> The multi-function printer Antico 40 manufactured by Kyocera Mita Co., Ltd. without the static elimination lamp was equipped with the electrophotographic photosensitive members of the respective examples and comparative examples, and the transfer bias was not applied. The surface potential and the surface potential after the next charging step when the transfer bias was applied were measured, and the difference was defined as the transfer memory potential. Regarding the transfer memory potential, a voltage of 45 V or less, at which no transfer memory image was generated, was acceptable, and a voltage of more than 45 V was not.
【００７０】＜露光メモリー電位評価＞除電ランプを取
除いた京セラミタ（株）社製マルチファンクションプリ
ンタＡｎｔｉｃｏ４０に、各実施例、比較例の電子写真
感光体を搭載し、未露光時の表面電位、及び露光時の次
帯電工程後の表面電位を測定し、その差異を露光メモリ
ー電位とした。露光メモリー電位については、転写メモ
リー電位と同様、露光メモリー画像の発生しない４５Ｖ
以下を可、４５Ｖより大きい場合を不可とした。<Evaluation of Exposure Memory Potential> The electrophotographic photosensitive members of Examples and Comparative Examples were mounted on a multi-function printer Antico40 manufactured by Kyocera Mita Co., Ltd. from which the static elimination lamp was removed. The surface potential after the next charging step at the time of exposure was measured, and the difference was defined as the exposure memory potential. Regarding the exposure memory potential, similarly to the transfer memory potential, 45 V at which no exposure memory image is generated.
The following was acceptable, and the case where the voltage was greater than 45 V was not acceptable.
【００７１】＜転写メモリー画像評価＞除電ランプを取
除いた京セラミタ（株）社製マルチファンクションプリ
ンタＡｎｔｉｃｏ４０に、各実施例、比較例の電子写真
感光体を搭載し、印写試験を実施し、転写メモリー画像
が発生しているか否かを目視により判断した。転写メモ
リー画像とは、図２に示すように、前面グレー（マンセ
ル値：Ｎ＝６．５）原稿を使用し印写試験を実施した場
合、転写バイアスが印加された部分の感光体表面電位の
低下により、ドラム長手方向に黒横帯が発生した画像を
示す。<Evaluation of Transfer Memory Image> The electrophotographic photosensitive members of the respective examples and comparative examples were mounted on a multifunction printer Antico40 manufactured by Kyocera Mita Co., Ltd. from which the static elimination lamp was removed, and a printing test was performed. It was visually determined whether or not a transfer memory image had occurred. As shown in FIG. 2, the transfer memory image refers to the surface potential of the photosensitive member in a portion where a transfer bias is applied when a printing test is performed using a front gray document (Munsell value: N = 6.5). An image in which a black horizontal band occurs in the longitudinal direction of the drum due to the drop is shown.
【００７２】＜露光メモリー画像評価＞除電ランプを取
除いた京セラミタ（株）社製マルチファンクションプリ
ンタＡｎｔｉｃｏ４０に、各実施例、比較例の電子写真
感光体を搭載し、印写試験を実施し、露光メモリー画像
が発生しているか否かを目視により判断した。露光メモ
リー画像とは、図３に示すような原稿を使用し印写試験
を実施した場合、強い露光部分（黒ベタ部）の感光体表
面電位の低下により、露光部分のゴースト画像がグレー
部に発生した画像を示す。<Evaluation of Exposure Memory Image> The electrophotographic photosensitive members of the respective examples and comparative examples were mounted on a multifunction printer Antico40 manufactured by Kyocera Mita Co., Ltd. from which the static elimination lamp was removed, and a printing test was performed. It was visually determined whether or not an exposure memory image was generated. The exposure memory image is a ghost image of an exposed portion that is gray when a printing test is performed using a document as shown in FIG. 3 due to a decrease in the photoconductor surface potential in a strongly exposed portion (solid black portion). 5 shows the generated image.
【００７３】[0073]
【表１】 [Table 1]
【００７４】[0074]
【表２】 [Table 2]
【００７５】表１、２、図１より、プラス極性とマイナ
ス極性の感度の絶対値差が５００Ｖ以下である場合、転
写メモリー電位及び露光メモリー電位の両方が４５Ｖ以
下となり、メモリー画像が発生しないことが明らかとな
った。From Tables 1 and 2 and FIG. 1, when the absolute value difference between the positive and negative polar sensitivities is 500 V or less, both the transfer memory potential and the exposure memory potential become 45 V or less, and no memory image is generated. Became clear.
【００７６】[0076]
【発明の効果】本発明の単層型電子写真感光体は、露光
メモリー及び転写メモリーが非常に小さいため、除電工
程を有さない反転現像方式のデジタル画像形成装置に使
用してもメモリー画像が発生しない。The single-layer type electrophotographic photoreceptor of the present invention has a very small exposure memory and transfer memory, so that even when used in a digital image forming apparatus of a reversal developing type which does not have a charge removing step, a memory image can be obtained. Does not occur.
【００７７】[0077]
【図１】各実施例、比較例の単層型電子写真感光体の転
写メモリー電位・露光メモリー電位と、プラス極性とマ
イナス極性の感度の絶対値差との関係を示すグラフであ
る。FIG. 1 is a graph showing a relationship between a transfer memory potential and an exposure memory potential of a single-layer type electrophotographic photosensitive member of each of Examples and Comparative Examples, and an absolute value difference between positive and negative polar sensitivities.
【図２】転写メモリー画像評価用原稿と転写メモリー画
像を示す図である。FIG. 2 is a diagram showing a transfer memory image evaluation document and a transfer memory image.
【図３】露光メモリー画像評価用原稿と露光メモリー画
像を示す図である。FIG. 3 is a diagram showing an exposure memory image evaluation document and an exposure memory image.
───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.7 識別記号 ＦＩ テーマコート゛(参考） Ｇ０３Ｇ 5/06 ３７１ Ｇ０３Ｇ 5/06 ３７１ (72)発明者 林 政克 大阪市中央区玉造１丁目２番28号 京セラ ミタ株式会社内 Ｆターム(参考） 2H068 AA14 AA19 AA20 AA31 BA12 BA13 BA14 BA16 BA38 FA18 FC04 ──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. 7 Identification symbol FI Theme coat ゛ (Reference) G03G 5/06 371 G03G 5/06 371 (72) Inventor Masakatsu Hayashi 1-chome, 2-chome, Chuo-ku, Osaka-shi No. 28 Kyocera Mita Corporation F term (reference) 2H068 AA14 AA19 AA20 AA31 BA12 BA13 BA14 BA16 BA38 FA18 FC04
Claims (5)
層が電荷発生剤としてのフタロシアニン系化合物、及び
ホール輸送剤、電子輸送剤をバインダー樹脂中に含有
し、且つ、露光波長７８０ｎｍ、露光エネルギー１．０
μＪ／ｃｍ2で測定した、プラス極性とマイナス極性の
感度の絶対値差が５００Ｖ以下であることを特徴とする
単層型電子写真感光体。1. A photosensitive layer is formed on a conductive substrate. The photosensitive layer contains a phthalocyanine compound as a charge generating agent, a hole transporting agent and an electron transporting agent in a binder resin, and has an exposure wavelength of 780 nm. , Exposure energy 1.0
A single-layer type electrophotographic photoreceptor, wherein the absolute value difference between the positive and negative polar sensitivities measured at μJ / cm 2 is 500 V or less.
度の絶対値より小さいことを特徴とする正帯電型の請求
項１記載の単層型電子写真感光体。2. The single-layer electrophotographic photosensitive member according to claim 1, wherein the absolute value of the positive polarity sensitivity is smaller than the absolute value of the negative polarity sensitivity.
れる化合物を含有することを特徴とする請求項２記載の
正帯電単層型電子写真感光体。 一般式（１）： 【化１】 （一般式（１）中、Ｒ1およびＲ3は同一または異なっ
て、置換基を有してもよいアルキル基、置換基を有して
もよいアリール基、置換基を有してもよい、アラルキル
基またはアルコキシ基を示し、Ｒ2およびＲ4は同一また
は異なって、水素原子、置換基を有してもよい、アルキ
ル基またはアルコキシ基を示す。但し、Ｒ2およびＲ4の
置換位置がパラ位の場合、Ｒ2およびＲ4は水素原子であ
る。）3. The positively charged single-layer type electrophotographic photoreceptor according to claim 2, wherein the hole transporting agent contains a compound represented by the general formula (1). General formula (1): (In the general formula (1), R 1 and R 3 are the same or different, and may have an alkyl group which may have a substituent, an aryl group which may have a substituent, or a substituent. An aralkyl group or an alkoxy group, and R 2 and R 4 are the same or different and each represent a hydrogen atom or an alkyl group or an alkoxy group which may have a substituent, provided that the substitution position of R 2 and R 4 is In the para position, R 2 and R 4 are hydrogen atoms.)
（３）、（４）または（５）で示される化合物を、少な
くとも１種以上含有することを特徴とする請求項２記載
の正帯電単層型電子写真感光体。 一般式（２）： 【化２】 （一般式（２）中、Ｒ5はハロゲン原子、置換基を有し
てもよい、アルキル基またはアリール基を示し、Ｒ6は
置換基を有してもよい、アルキル基またはアリール基、
または基：−Ｏ−Ｒ6aを示す。Ｒ6aは、置換基を有して
もよい、アルキル基またはアリール基を示す。） 一般式（３）： 【化３】 （一般式（３）中、Ｒ7およびＲ8は同一または異なっ
て、アルキル基、ハロゲン化アルキル基、アリール基、
アラルキル基、アルコキシ基、アリールオキシ基、アラ
ルキルオキシ基、アシル基、アルコキシカルボニル基、
アリールオキシカルボニル基、アラルキルオキシカルボ
ニル基またはニトロ基を示す。ｎは０〜３の整数を表わ
す。） 一般式（４）： 【化４】 （一般式（４）中、Ｒ9a、Ｒ9b、Ｒ9c、およびＲ9dは同
一または異なって、水素原子、置換基を有してもよい、
アルキル基またはアリール基を示す。） 一般式（５）： 【化５】 （一般式（５）中、Ｒ10およびＲ11は同一または異なっ
て、アルキル基、ハロゲン化アルキル基、アリール基、
アラルキル基、アルコキシ基、アリールオキシ基、アラ
ルキルオキシ基、アシル基、アルコキシカルボニル基、
アリールオキシカルボニル基、アラルキルオキシカルボ
ニル基またはニトロ基を示す。ｎは０〜３の整数を表わ
す。）4. An electron transporting agent as represented by the following general formula (2):
3. The positively charged single-layer type electrophotographic photoconductor according to claim 2, comprising at least one compound represented by (3), (4) or (5). General formula (2): (In the general formula (2), R 5 represents a halogen atom, an alkyl group or an aryl group which may have a substituent, and R 6 represents an alkyl group or an aryl group which may have a substituent.
Or a group: -OR 6a . R 6a represents an alkyl group or an aryl group which may have a substituent. General formula (3): (In the general formula (3), R 7 and R 8 are the same or different and each is an alkyl group, a halogenated alkyl group, an aryl group,
Aralkyl group, alkoxy group, aryloxy group, aralkyloxy group, acyl group, alkoxycarbonyl group,
It represents an aryloxycarbonyl group, an aralkyloxycarbonyl group or a nitro group. n represents an integer of 0 to 3. General formula (4): (In the general formula (4), R 9a , R 9b , R 9c and R 9d are the same or different and each may have a hydrogen atom or a substituent;
It represents an alkyl group or an aryl group. General formula (5): (In the general formula (5), R 10 and R 11 are the same or different and each is an alkyl group, a halogenated alkyl group, an aryl group,
Aralkyl group, alkoxy group, aryloxy group, aralkyloxy group, acyl group, alkoxycarbonyl group,
It represents an aryloxycarbonyl group, an aralkyloxycarbonyl group or a nitro group. n represents an integer of 0 to 3. )
用し、前記感光体の進行方向に沿って、少なくとも主帯
電工程、露光工程、現像工程、転写工程とを備え、前記
転写工程で印加される電圧は、帯電工程で印加される電
圧とは逆極性であることを特徴とする除電工程を有さな
い反転現像式デジタル画像形成装置。5. The method according to claim 1, further comprising at least a main charging step, an exposing step, a developing step, and a transferring step along a traveling direction of the photosensitive element. A reversal-developing digital image forming apparatus having no charge removing step, wherein the voltage applied in the step has a polarity opposite to that of the voltage applied in the charging step.
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|---|---|---|---|
| JP2000131501A JP3638500B2 (en) | 2000-04-26 | 2000-04-26 | Single layer type electrophotographic photosensitive member and image forming apparatus using the same |
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| USRE39516E1 (en) | 1999-10-25 | 2007-03-13 | Kyocera Mita Corporation | Single-layer type electrophotosensitive material and image forming apparatus using the same |
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| WO2017187838A1 (en) * | 2016-04-25 | 2017-11-02 | 京セラドキュメントソリューションズ株式会社 | Electrophotographic photoreceptor, process cartridge and image-forming device |
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| USRE39516E1 (en) | 1999-10-25 | 2007-03-13 | Kyocera Mita Corporation | Single-layer type electrophotosensitive material and image forming apparatus using the same |
| USRE42189E1 (en) | 1999-10-25 | 2011-03-01 | Kyocera Mita Corporation | Single-layer type electrophotosensitive material and image forming apparatus using the same |
| JP2008026794A (en) * | 2006-07-25 | 2008-02-07 | Ricoh Co Ltd | Photoreceptor evaluation device, image forming apparatus and evaluation method |
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| CN102902171A (en) * | 2011-07-28 | 2013-01-30 | 京瓷办公信息***株式会社 | Electrophotographic photoreceptor using bis (triphenylamine) derivatives and imaging forming apparatus |
| JP2014126610A (en) * | 2012-12-25 | 2014-07-07 | Kyocera Document Solutions Inc | Electrophotographic photoreceptor and image forming apparatus |
| WO2017187838A1 (en) * | 2016-04-25 | 2017-11-02 | 京セラドキュメントソリューションズ株式会社 | Electrophotographic photoreceptor, process cartridge and image-forming device |
| US20190086825A1 (en) * | 2016-04-25 | 2019-03-21 | Kyocera Document Solutions Inc. | Electrophotographic photosensitive member, process cartridge, and image forming apparatus |
| US10545418B2 (en) * | 2016-04-25 | 2020-01-28 | Kyocera Document Solutions Inc. | Electrophotographic photosensitive member, process cartridge, and image forming apparatus |
| JP2018155857A (en) * | 2017-03-16 | 2018-10-04 | 富士ゼロックス株式会社 | Image formation device |
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