JPH1195463A - Electrophotographic photoreceptor - Google Patents
Electrophotographic photoreceptorInfo
- Publication number
- JPH1195463A JPH1195463A JP25919997A JP25919997A JPH1195463A JP H1195463 A JPH1195463 A JP H1195463A JP 25919997 A JP25919997 A JP 25919997A JP 25919997 A JP25919997 A JP 25919997A JP H1195463 A JPH1195463 A JP H1195463A
- Authority
- JP
- Japan
- Prior art keywords
- photosensitive layer
- base body
- conductive base
- layer
- electrophotographic photoreceptor
- 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.)
- Withdrawn
Links
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】この発明は電子写真用感光体
の感光層に係り、特に安定した高解像度を示す感光層の
構成に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a photosensitive layer of an electrophotographic photoreceptor, and more particularly to a structure of a photosensitive layer exhibiting stable and high resolution.
【０００２】[0002]
【従来の技術】電子写真技術は画像の即時性，高速性，
高解像性により複写機，プリンター，ファックスの分野
で広く使用されている。電子写真に用いられる感光体
は、従来セレン，セレン合金，酸化亜鉛，硫化カドミウ
ムなどの無機系の光導電物質を使用したものが多かっ
た。2. Description of the Related Art Electrophotography is a technology that provides immediate, high-speed images.
Due to its high resolution, it is widely used in copiers, printers and fax machines. Photoconductors used for electrophotography have conventionally used many inorganic photoconductive materials such as selenium, selenium alloys, zinc oxide, and cadmium sulfide.
【０００３】最近では、無公害性，成膜性，軽量性など
の利点を生かし、有機系の光導電物質を使用した感光体
の開発が盛んに進められている。中でも電荷発生層及び
電荷輸送層を分離した、いわゆる積層型有機感光体は各
層をそれぞれの機能に最適な有機物質で形成し、組合せ
ることにより感度が大幅に向上する。また希望する露光
用の光波長に応じた分光感度を設定できるなど利点が多
く複写機，プリンター，ファックスなどの電子写真装置
に使用されている。情報化の進展に伴い、これらの電子
写真装置にはより一層の高速化、高解像化が求められて
いる。Recently, photoconductors using organic photoconductive materials have been actively developed, taking advantage of their non-polluting properties, film-forming properties, and light weight. Above all, in a so-called laminated organic photoreceptor in which the charge generation layer and the charge transport layer are separated, the sensitivity is greatly improved by forming each layer with an organic substance optimal for each function and combining them. Further, it has many advantages such as setting a spectral sensitivity according to a desired light wavelength for exposure, and is used in electrophotographic devices such as copiers, printers, and faxes. With the advance of computerization, these electrophotographic apparatuses are required to have higher speed and higher resolution.
【０００４】[0004]
【発明が解決しようとする課題】現在実用化されている
積層型有機感光体の多くは導電性基体の上に電荷発生
層、電荷輸送層をこの順に積層したものである。このよ
うな感光体は電荷発生物質をバインダーと共に有機溶媒
に分散, 溶解した塗液を塗布し乾燥して、電荷発生層を
形成し、引続きこの上に電荷移動物質をバインダーと共
に有機溶媒に溶解した塗液を塗布し乾燥して、電荷輸送
層を形成して作製される。基本的にはこのような層構成
で画像形成のための感光体としての基本性能は発揮させ
ることができる。しかし実用的には欠陥のない良好な画
像を得ることが重要であり、しかも繰り返し長時間使用
した際にも高解像度をはじめとした良好な画質が維持さ
れることが要求される。そのためには均質で欠陥のない
膜質の感光層を形成すること、感光体の電気特性が優れ
ていることが要求され、また長期間使用しても膜質，電
気特性が悪化せず安定していることが必要である。とこ
ろが初期に良好な画像が得られても長時間連続使用する
と、解像度が低下する現象が多々発生した。Most of the laminated organic photoreceptors which have been put into practical use at present have a charge generating layer and a charge transport layer laminated on a conductive substrate in this order. In such a photoreceptor, a charge generation material was dispersed in an organic solvent together with a binder, and a coating liquid in which the binder was dissolved was applied and dried to form a charge generation layer. Subsequently, the charge transfer material was dissolved in the organic solvent together with the binder thereon. It is produced by applying a coating liquid and drying to form a charge transport layer. Basically, with such a layer configuration, basic performance as a photoreceptor for image formation can be exhibited. However, in practice, it is important to obtain a good image without defects, and it is required that good image quality including high resolution is maintained even after repeated use for a long time. For this purpose, it is required that a photosensitive layer having a uniform and defect-free film quality is formed, and that the electrical characteristics of the photoreceptor be excellent, and that the film quality and electrical characteristics are stable without deterioration even after long-term use. It is necessary. However, even when a good image is obtained at the initial stage, if the device is used continuously for a long time, the phenomenon that the resolution is reduced often occurs.
【０００５】この発明は上述の点に鑑みてなされその目
的は、初期特性が良好である上に長時間の繰り返し使用
に際しても高解像度の画像が安定して得られる電子写真
用感光体を提供することにある。SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and has as its object to provide an electrophotographic photoreceptor having good initial characteristics and capable of stably obtaining a high-resolution image even when used repeatedly for a long time. It is in.
【０００６】[0006]
【課題を解決するための手段】上述の目的はこの発明に
よれば導電性基体上に感光層を積層した電子写真用感光
体において、暗中における感光層内のキャリア数が 1.0
×109 (cm -3) 以下であることにより達成される。上述
の発明において感光層の膜厚が22μm 以下であること、
または感光層がキナアルカロイドを含有することが有効
である。According to the present invention, there is provided an electrophotographic photosensitive member having a photosensitive layer laminated on a conductive substrate according to the present invention, wherein the number of carriers in the photosensitive layer in darkness is 1.0.
It is achieved by being not more than × 10 9 (cm −3 ). In the above invention, the photosensitive layer has a thickness of 22 μm or less,
Alternatively, it is effective that the photosensitive layer contains a kina alkaloid.
【０００７】[0007]
【発明の実施の形態】暗状態における感光層内の不要な
キャリア数を 1×109 (cm -3) 以下にする化合物の具体
例が以下に示される。例えばキナアルカロイドとして化
学式 (Ｉ─1)に示されるシンコニン, 化学式 (Ｉ─2)に
示されるシンコニジン, 化学式 (Ｉ─3)に示されるキニ
ーネ, 化学式 (Ｉ─4)に示されるキニジン等が挙げられ
る。BEST MODE FOR CARRYING OUT THE INVENTION Specific examples of compounds for reducing the number of unnecessary carriers in the photosensitive layer in the dark state to 1 × 10 9 (cm −3 ) or less are shown below. For example, the cina alkaloids include cinchonine represented by the chemical formula (I─1), cinchonidine represented by the chemical formula (I─2), quinine represented by the chemical formula (I─3), quinidine represented by the chemical formula (I─4), and the like. Can be
【０００８】[0008]
【化１】 図１はこの発明の負帯電積層型電子写真用感光体を示す
断面図である。図２はこの発明の正帯電積層型電子写真
用感光体を示す断面図である。図３はこの発明の正帯電
単層型電子写真用感光体を示す断面図である。１は導電
性基体、２は下引き層、３は電荷発生層、４は電荷輸送
層、５は表面保護層、６は感光層である。Embedded image FIG. 1 is a sectional view showing a negatively-charged laminated electrophotographic photoconductor of the present invention. FIG. 2 is a sectional view showing a positively-charged laminated electrophotographic photoconductor of the present invention. FIG. 3 is a sectional view showing the positively charged single-layer type electrophotographic photoconductor of the present invention. 1 is a conductive substrate, 2 is an undercoat layer, 3 is a charge generation layer, 4 is a charge transport layer, 5 is a surface protective layer, and 6 is a photosensitive layer.
【０００９】導電性基体としては、アルミニウム製円筒
やアルミニウム蒸着のフィルム等の導電性基体単独，該
導電性基体の表面をアルマイト化したもの，あるいは樹
脂皮膜などによる表面修飾を施したもの等が用いられ
る。表面修飾に用いられる高分子分散皮膜にはカゼイ
ン, ポリビニルアルコール, ナイロン, ポリアミド, メ
ラニン, セルロースなどの絶縁性高分子、ポリチオフェ
ン, ポリピロール, ポリアニリンなどの導電性高分子、
あるいはこれら高分子に金属酸化物粉末、低分子化合物
を含有させたものが用いられる。As the conductive substrate, a conductive substrate alone such as an aluminum cylinder or an aluminum vapor-deposited film, an alumite-treated surface of the conductive substrate, or a surface modified with a resin film or the like is used. Can be Polymer dispersion films used for surface modification include insulating polymers such as casein, polyvinyl alcohol, nylon, polyamide, melanin, and cellulose; conductive polymers such as polythiophene, polypyrrole, and polyaniline;
Alternatively, those obtained by adding a metal oxide powder or a low molecular compound to these polymers are used.
【００１０】下引き層は例えばセルロース系樹脂，ポリ
アミド系樹脂，ポリビニルアルコール系樹脂，ポリエス
テル系樹脂等の樹脂あるいは樹脂中に無機フィラーを分
散させたものが用いられる。積層型感光体の場合に電荷
発生層に使用される電荷発生物質としては、例えばセレ
ニウム及びその合金，硫化カドミウム，その外の無機系
光導電物質，フタロシアニン顔料，アゾ顔料，キナクリ
ドン顔料，インジゴ顔料，ペリレン顔料，多環キノン顔
料，アントアントロン顔料，ベンズイミダゾール顔料な
どの有機顔料等各種光導電物質が使用でき、これらの微
粒子を例えばポリエステル樹脂，ポリビニルアセテー
ト，ポリアクリル酸エステル，ポリメタクリル酸エステ
ル，ポリカーボネート，ポリビニルアセトアセタール，
ポリビニルプロピオナール，ポリビニルブチラール，フ
ェノキシ樹脂，エポキシ樹脂，ウレタン樹脂，セルロー
スエステル，セルロースエーテルなどの各種バインダー
樹脂で結着して使用される。使用比率はバインダー樹脂
１００重量部に対して３０〜５００重量部の範囲で使用
され、その膜厚は通常0.１５μm 〜0.６μm が好適であ
る。As the undercoat layer, for example, a resin such as a cellulose resin, a polyamide resin, a polyvinyl alcohol resin, and a polyester resin, or a resin in which an inorganic filler is dispersed in a resin is used. Examples of the charge generating material used in the charge generating layer in the case of a laminated photoreceptor include selenium and its alloys, cadmium sulfide, inorganic photoconductive materials other than them, phthalocyanine pigments, azo pigments, quinacridone pigments, indigo pigments, and the like. Various photoconductive materials such as organic pigments such as perylene pigments, polycyclic quinone pigments, anthantrone pigments, and benzimidazole pigments can be used. These fine particles can be used, for example, polyester resin, polyvinyl acetate, polyacrylate, polymethacrylate, polycarbonate. , Polyvinyl acetoacetal,
It is used by binding with various binder resins such as polyvinyl propional, polyvinyl butyral, phenoxy resin, epoxy resin, urethane resin, cellulose ester and cellulose ether. The use ratio is in the range of 30 to 500 parts by weight with respect to 100 parts by weight of the binder resin, and the film thickness is usually preferably 0.15 μm to 0.6 μm.
【００１１】電荷輸送層は、エナミン系化合物，スチリ
ル系化合物，ヒドラゾン系化合物，アミン系化合物，ブ
タジエン系化合物をこれらと相溶性のある樹脂、例え
ば、ポリエステル，ポリカーボネート，ポリスチレン，
ポリアクリル酸エステル，ポリメタクリル酸エステルな
どと共に溶液とし、乾燥膜厚１０〜２２μm の厚さに塗
布して形成される。電荷輸送層は必要に応じ、酸化防止
剤，紫外線吸収剤，レベリング剤などの各種添加剤を含
ませることができる。The charge transport layer is made of an enamine-based compound, styryl-based compound, hydrazone-based compound, amine-based compound or butadiene-based compound which is compatible with these resins such as polyester, polycarbonate, polystyrene, and the like.
It is formed by applying a solution together with a polyacrylic acid ester, a polymethacrylic acid ester, or the like, and applying it to a dry film thickness of 10 to 22 μm. The charge transport layer may contain various additives such as an antioxidant, an ultraviolet absorber, and a leveling agent, if necessary.
【００１２】高い解像度を得るためには、第一に暗中で
の感光層のキャリア数を小さくすることが有効である。
暗状態でもキャリア数が多いような感光層の場合は、キ
ャリア束が散乱を受け画像の解像度が落ちる。暗状態に
おける感光層内の不要なキャリア数を少なくするために
は例えばシンコニジンなどのキナアルカロイドを適正量
添加することが有効である。これはキナアルカロイド分
子中のキヌクリジン核等の窒素原子が有する孤立電子対
が過剰なキャリア( ホール) を捕獲することによる効果
である。この効果は電荷発生層に添加しても電荷輸送層
に添加しても得られる。In order to obtain a high resolution, first, it is effective to reduce the number of carriers in the photosensitive layer in the dark.
In the case of a photosensitive layer in which the number of carriers is large even in a dark state, the carrier bundle is scattered and the resolution of an image is reduced. In order to reduce the number of unnecessary carriers in the photosensitive layer in the dark state, it is effective to add a proper amount of a quin alkaloid such as cinchonidine. This is due to the effect of the lone electron pair of the nitrogen atom such as the quinuclidine nucleus in the kina alkaloid molecule capturing excess carriers (holes). This effect can be obtained by adding it to the charge generation layer or to the charge transport layer.
【００１３】第二に感光層の膜厚、特に電荷輸送層の膜
厚を小さくすることが有効である。膜厚が大きいと、光
生成したキャリア束が感光層内を走行する際にキャリア
束が全方向に拡散するために静電潜像のボケが無視でき
なくなり、得られる印字画像の解像度が低くなる。実用
上は22μm 以下が良好である。この発明の効果は図１ま
たは図２に示す積層型の感光体あっても図３にしめす単
層型であっても同様に得られる。Second, it is effective to reduce the thickness of the photosensitive layer, particularly the thickness of the charge transport layer. If the film thickness is large, the blur of the electrostatic latent image cannot be ignored because the carrier bundle diffuses in all directions when the photogenerated carrier bundle travels in the photosensitive layer, and the resolution of the obtained printed image is reduced. . Practically, 22 μm or less is good. The effects of the present invention can be obtained in the same manner regardless of whether the photoreceptor is of the stacked type shown in FIG. 1 or FIG. 2 or of the single-layer type shown in FIG.
【００１４】[0014]
実施例１ Ｘ型無金属フタロシアニン１重量部、塩化ビニル共重合
樹脂（ＭＲ１１０；日本ゼオン（株）製）１重量部をジ
クロロメタン１００重量部に分散・溶解させた塗液を作
製し、アルマイト処理したＡｌの円筒状基体上に浸漬塗
工法により塗布し乾燥して電荷発生層を形成した。乾燥
後の膜厚は０．２μm であった。Example 1 A coating liquid was prepared by dispersing and dissolving 1 part by weight of an X-type metal-free phthalocyanine and 1 part by weight of a vinyl chloride copolymer resin (MR110; manufactured by Nippon Zeon Co., Ltd.) in 100 parts by weight of dichloromethane, and anodized. A charge generation layer was formed by coating on a cylindrical Al substrate by dip coating and drying. The film thickness after drying was 0.2 μm.
【００１５】次にヒドラゾン化合物（ＣＴＣ−１９１；
亜南香料（株）製）１重量部、ポリカーボネート樹脂
（パンライトＬ１２２５；帝人化成（株）製）１重量
部、シンコニジン０．００５重量部をジクロロメタン１
０重量部に溶解した。この溶液を前記した電荷発生層上
に塗布し乾燥して電荷輸送層を形成した。乾燥後の膜厚
は２０μm であった。電荷輸送層の移動度をタイム オ
ブ フライト（time of flight）法により測定すると、
1.2 ×10-6(cm2/V・s)であり、暗抵抗率を測定すると8.
7 ×1015( Ω・cm) であった。従って電荷輸送層のキャ
リアー数は、0.6 ×109 (cm -3) 個であった。 実施例２ シンコニジン０．００５重量部に替えてシンコニジンを
０．００８重量部添加する以外は実施例１と同様の方法
で電子写真感光体を作製した。電荷輸送層のキャリアー
数は0.5 ×109 (cm -3) 個であった。 実施例３ シンコニジン０．００５重量部に替えてシンコニンを
０．００５重量部添加する以外は実施例１と同様の方法
で電子写真感光体を作製した。電荷輸送層のキャリアー
数は0.7 ×109 (cm -3) 個であった。 実施例４ シンコニジン０．００５重量部に替えてシンコニンを
０．００８重量部添加する以外は実施例１と同様の方法
で電子写真感光体を作製した。この時用いた電荷輸送層
のキャリアー数は0.6 ×109 (cm -3) 個であった。 比較例１ 実施例１においてシンコニジン０．００５重量部を添加
しない他は実施例１と同様にして電荷輸送層を形成し
た。電荷輸送層のキャリアー数は8.7 ×109 (cm -3) 個
であった。 比較例２ 実施例１においてシンコニジン０．００５重量部に替え
てシンコニジン０．００１重量部を加える他は実施例１
と同様にして電荷輸送層を形成した。電荷輸送層のキャ
リアー数は1.1 ×109 (cm -3) 個であった。 比較例３ 実施例１においてシンコニジン０．００５重量部に替え
てシンコニン０．００１重量部を加える他は実施例１と
同様にして電荷輸送層を形成した。電荷輸送層のキャリ
アー数は1.2 ×109 (cm -3) 個であった。Next, a hydrazone compound (CTC-191;
1 part by weight, manufactured by Anan Perfumery Co., Ltd., polycarbonate resin
(Panlite L1225; manufactured by Teijin Chemicals Ltd.) 1 weight
Parts, 0.005 parts by weight of cinchonidine and 1 part of dichloromethane
Dissolved in 0 parts by weight. Place this solution on the charge generation layer
And dried to form a charge transport layer. Film thickness after drying
Was 20 μm. Time-dependent mobility of the charge transport layer
When measured by the time of flight method,
1.2 × 10-6(cmTwo/ V ・ s), and the dark resistivity is measured as 8.
7 × 10Fifteen(Ω · cm). Therefore, the charge transport layer
Rear number is 0.6 × 109(cm -3). Example 2 Cinchonidine was replaced with 0.005 parts by weight of cinchonidine.
The same method as in Example 1 except that 0.008 parts by weight is added.
To prepare an electrophotographic photoreceptor. Carrier in charge transport layer
The number is 0.5 x 109(cm -3). Example 3 Cinchonidine was replaced with 0.005 parts by weight of cinchonine
The same method as in Example 1 except that 0.005 parts by weight is added.
To prepare an electrophotographic photoreceptor. Carrier in charge transport layer
The number is 0.7 x 109(cm -3). Example 4 Cinchonidine was used instead of 0.005 parts by weight of cinchonidine
The same method as in Example 1 except that 0.008 parts by weight is added.
To prepare an electrophotographic photoreceptor. The charge transport layer used at this time
0.6 × 10 carriers9(cm -3). Comparative Example 1 In Example 1, 0.005 parts by weight of cinchonidine was added.
A charge transport layer was formed in the same manner as in Example 1 except that the charge transport layer was not formed.
Was. The number of carriers in the charge transport layer is 8.7 × 109(cm -3) Individual
Met. Comparative Example 2 In Example 1, the content was changed to 0.005 parts by weight of cinchonidine.
Example 1 except that 0.001 part by weight of cinchonidine was added.
A charge transport layer was formed in the same manner as described above. Charge transport layer cap
The number of rear is 1.1 × 109(cm -3). Comparative Example 3 Example 1 was changed to 0.005 parts by weight of cinchonidine.
Example 1 except that 0.001 part by weight of cinchonine was added.
Similarly, a charge transport layer was formed. Carry of charge transport layer
The number of arcs is 1.2 × 109(cm -3).
【００１６】このようにして得られた電子写真用感光体
を市販のレーザービームプリンター(600dpi 仕様) に装
填して、1 ドット幅の白線と黒線とを交互に印字するパ
ターンにて画像出しを行い、それぞれ画像上における白
線・黒線の再現の明瞭さの優劣をみることにより解像度
の評価を行った。初期における解像度と6000枚連続印字
を行った後の解像度の評価結果が表 1に示される。The photoreceptor for electrophotography obtained in this manner is loaded into a commercially available laser beam printer (600 dpi specification), and an image is output in a pattern in which white lines and black lines having a width of 1 dot are alternately printed. The resolution was evaluated by observing the clarity of the reproduction of the white line and the black line on the image. Table 1 shows the evaluation results of the initial resolution and the resolution after continuous printing of 6000 sheets.
【００１７】[0017]
【表１】 シンコニジンやシンコニンを０．００５重量部ないし
０．００８重量部、電荷輸送層に加えた電子写真用感光
体は、初期においても６０００枚連続印刷後においても
解像度が良好であることがわかる。[Table 1] It can be seen that the electrophotographic photoreceptor containing 0.005 parts by weight to 0.008 parts by weight of cinchonidine or cinchonine added to the charge transport layer has good resolution both at the initial stage and after continuous printing of 6,000 sheets.
【００１８】[0018]
【発明の効果】この発明によれば暗中における感光層内
のキャリア数が 1.0×109 (cm -3) 以下であるので、キ
ャリアー束の散乱が少なくなり初期においても繰り返し
使用後においても良好な画像解像度を示す電子写真用感
光体が得られる。感光層内の不要なキャリア数を少なく
するためにはキナアルカロイドを適正量添加することが
有効である。また感光層の膜厚を22μm 以下にすると光
生成したキャリア束の拡散の影響が少なくなり感光体画
像の解像度が高まる。According to the present invention, since the number of carriers in the photosensitive layer in the dark is 1.0 × 10 9 (cm −3 ) or less, scattering of the carrier bundle is reduced, and good results can be obtained both at the initial stage and after repeated use. An electrophotographic photoreceptor exhibiting image resolution is obtained. In order to reduce the number of unnecessary carriers in the photosensitive layer, it is effective to add an appropriate amount of quina alkaloid. When the thickness of the photosensitive layer is set to 22 μm or less, the effect of diffusion of the photogenerated carrier bundle is reduced, and the resolution of the photoconductor image is increased.
【図１】この発明の負帯電積層型電子写真用感光体を示
す断面図FIG. 1 is a cross-sectional view showing a negatively charged laminated electrophotographic photoreceptor of the present invention.
【図２】この発明の正帯電積層型電子写真用感光体を示
す断面図FIG. 2 is a cross-sectional view showing a positively charged laminated electrophotographic photoreceptor of the present invention.
【図３】この発明の正帯電単層型電子写真用感光体を示
す断面図FIG. 3 is a sectional view showing a positively charged single-layer type electrophotographic photoreceptor of the present invention.
１ 導電性基体 ２ 下引き層 ３ 電荷発生層 ４ 電荷輸送層 ５ 表面保護層 ６ 感光層 REFERENCE SIGNS LIST 1 conductive substrate 2 undercoat layer 3 charge generation layer 4 charge transport layer 5 surface protective layer 6 photosensitive layer
Claims (3)
用感光体において、暗中における感光層内のキャリア数
が 1.0×109 (cm -3) 以下であることを特徴とする電子
写真用感光体。1. An electrophotographic photosensitive member having a photosensitive layer laminated on a conductive substrate, wherein the number of carriers in the photosensitive layer in the dark is 1.0 × 10 9 (cm −3 ) or less. Photoreceptor.
に記載の電子写真用感光体。2. The photosensitive layer according to claim 1, wherein said photosensitive layer has a thickness of 22 μm or less.
2. The electrophotographic photoreceptor according to claim 1.
項１に記載の電子写真用感光体。3. The electrophotographic photosensitive member according to claim 1, wherein the photosensitive layer contains a kina alkaloid.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP25919997A JPH1195463A (en) | 1997-09-25 | 1997-09-25 | Electrophotographic photoreceptor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP25919997A JPH1195463A (en) | 1997-09-25 | 1997-09-25 | Electrophotographic photoreceptor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH1195463A true JPH1195463A (en) | 1999-04-09 |
Family
ID=17330766
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP25919997A Withdrawn JPH1195463A (en) | 1997-09-25 | 1997-09-25 | Electrophotographic photoreceptor |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH1195463A (en) |
-
1997
- 1997-09-25 JP JP25919997A patent/JPH1195463A/en not_active Withdrawn
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