JPH04110857A - Electrophotographic sensitive body - Google Patents
Electrophotographic sensitive bodyInfo
- Publication number
- JPH04110857A JPH04110857A JP22958090A JP22958090A JPH04110857A JP H04110857 A JPH04110857 A JP H04110857A JP 22958090 A JP22958090 A JP 22958090A JP 22958090 A JP22958090 A JP 22958090A JP H04110857 A JPH04110857 A JP H04110857A
- Authority
- JP
- Japan
- Prior art keywords
- layer
- intermediate layer
- charge generation
- electrophotographic photoreceptor
- charge
- 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.)
- Pending
Links
- 239000010410 layer Substances 0.000 claims abstract description 93
- 239000000758 substrate Substances 0.000 claims abstract description 14
- 239000011241 protective layer Substances 0.000 claims abstract description 6
- 108091008695 photoreceptors Proteins 0.000 claims description 31
- 238000010030 laminating Methods 0.000 abstract 1
- 238000000576 coating method Methods 0.000 description 15
- 239000011248 coating agent Substances 0.000 description 12
- 230000000052 comparative effect Effects 0.000 description 6
- JHIVVAPYMSGYDF-UHFFFAOYSA-N cyclohexanone Chemical compound O=C1CCCCC1 JHIVVAPYMSGYDF-UHFFFAOYSA-N 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 239000007921 spray Substances 0.000 description 4
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 description 3
- 238000005336 cracking Methods 0.000 description 3
- 238000010438 heat treatment Methods 0.000 description 3
- 239000000049 pigment Substances 0.000 description 3
- RTZKZFJDLAIYFH-UHFFFAOYSA-N Diethyl ether Chemical compound CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 description 2
- LRHPLDYGYMQRHN-UHFFFAOYSA-N N-Butanol Chemical compound CCCCO LRHPLDYGYMQRHN-UHFFFAOYSA-N 0.000 description 2
- WYURNTSHIVDZCO-UHFFFAOYSA-N Tetrahydrofuran Chemical compound C1CCOC1 WYURNTSHIVDZCO-UHFFFAOYSA-N 0.000 description 2
- 239000006185 dispersion Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000007639 printing Methods 0.000 description 2
- 239000004677 Nylon Substances 0.000 description 1
- PJANXHGTPQOBST-VAWYXSNFSA-N Stilbene Natural products C=1C=CC=CC=1/C=C/C1=CC=CC=C1 PJANXHGTPQOBST-VAWYXSNFSA-N 0.000 description 1
- -1 Stilbene compound Chemical class 0.000 description 1
- 239000011324 bead Substances 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000008602 contraction Effects 0.000 description 1
- HPXRVTGHNJAIIH-UHFFFAOYSA-N cyclohexanol Chemical compound OC1CCCCC1 HPXRVTGHNJAIIH-UHFFFAOYSA-N 0.000 description 1
- 238000007598 dipping method Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 229920001778 nylon Polymers 0.000 description 1
- 239000012466 permeate Substances 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 235000021286 stilbenes Nutrition 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- YLQBMQCUIZJEEH-UHFFFAOYSA-N tetrahydrofuran Natural products C=1C=COC=1 YLQBMQCUIZJEEH-UHFFFAOYSA-N 0.000 description 1
- 239000010409 thin film Substances 0.000 description 1
Landscapes
- Photoreceptors In Electrophotography (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は電子写真感光体に関し、詳しくは、中間層(下
引き層)の端部位置を感光層の端部位置との関係で特定
した電子写真感光体に関する。[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an electrophotographic photoreceptor, and more specifically, the present invention relates to an electrophotographic photoreceptor, in particular, a method for specifying the end position of an intermediate layer (subbing layer) in relation to the end position of a photosensitive layer. Related to electrophotographic photoreceptors.
電子写真感光体(以降「感光体」と略記することがある
)は、一般に、導電性基体上に中間層を介して感光層を
形成した構造を呈しており、また必要に応じて、感光層
上には保護層が設けられているのが一般的である。An electrophotographic photoreceptor (hereinafter sometimes abbreviated as "photoreceptor") generally has a structure in which a photosensitive layer is formed on a conductive substrate with an intermediate layer interposed therebetween. A protective layer is generally provided on top.
かかる感光体は、第3図に示したように、導電性基体1
1上に中間層12、感光層13′(電荷発生層131及
び電荷輸送層132からなる)、保護層14等が積層さ
れているが、これら各層は多くの場合端面が一致又はほ
ぼ一致するように形成されている。そして、こうした感
光体の製造においては、感光層13′が有機系のもので
は、その成膜法としてビードコーティング法(シート法
、シームレスベルト状等の導電性基体への塗工に有用)
やディッピング法(ドラム状導電性基体への塗工に有用
)などが従来より採用されてきているが、近時は、薄膜
の膜厚調整が良好なスプレ一方式が多く採用されるよう
になってきている。Such a photoreceptor includes a conductive substrate 1 as shown in FIG.
1, an intermediate layer 12, a photosensitive layer 13' (consisting of a charge generation layer 131 and a charge transport layer 132), a protective layer 14, etc. are laminated on the layer 1, and in many cases, the end surfaces of these layers are aligned or almost aligned. is formed. In the production of such a photoreceptor, if the photosensitive layer 13' is organic, the bead coating method (sheet method, useful for coating on a conductive substrate such as a seamless belt) is used.
Conventionally, methods such as the coating method and the dipping method (useful for coating drum-shaped conductive substrates) have been used, but recently, the spray method, which allows for better control of the thickness of the thin film, has been increasingly used. It's coming.
しかし、いずれの塗工手段によっても導電性基体の端部
における各層の膜厚は他の層と同様に均−或いは他の層
より厚くなったり薄くなったり、また、塗膜が端部にて
露出して、端部への外力や導電性基体及び塗膜の膨張や
収縮などによる端部のひび割れが発生し、更にこれに起
因して感光層等の導電性基体からの剥離や脱落が見られ
、感光体の寿命を著しく低下させてしまうといった不都
合が認められる。However, no matter which coating method is used, the thickness of each layer at the edge of the conductive substrate may be uniform like the other layers, or may be thicker or thinner than the other layers, or the coating may be uneven at the edge. When exposed, cracks occur at the edges due to external forces applied to the edges, expansion and contraction of the conductive substrate and coating, and due to this, peeling or falling off of the photosensitive layer etc. from the conductive substrate is observed. However, there are disadvantages in that the life of the photoreceptor is significantly shortened.
もっとも、こうした不都合の生じるのを阻止するために
、感光層の端部を中間層の端部より内側に形成し、かつ
、中間層の端部表面を露出させるようにした電子写真感
光体が提案されている(特公平1−51184号公報)
。だが、こうした構成を採用した電子写真感光体におい
ても、多数枚の複写操作で感光層はその端部と中間層と
の間から剥離が生じやすく、遂にはひび割れを招来し、
耐刷性に支障をもたらすといった危惧を有している。However, in order to prevent such inconvenience from occurring, an electrophotographic photoreceptor has been proposed in which the end of the photosensitive layer is formed inside the end of the intermediate layer, and the end surface of the intermediate layer is exposed. (Special Publication No. 1-51184)
. However, even in electrophotographic photoreceptors employing such a structure, the photosensitive layer tends to peel off between the edges and the intermediate layer when a large number of copies are made, which eventually leads to cracking.
There is a concern that this may impede printing durability.
本発明は前記のごとく不都合・危惧を解消し、すぐれた
耐刷性が得られる電子写真感光体を提供するものである
。The present invention eliminates the above-mentioned inconveniences and concerns and provides an electrophotographic photoreceptor that provides excellent printing durability.
〔課題を解決するための手段〕
本発明は導電性基体上に中間層、電荷発生層(CGL)
、電荷輸送層(CTL)、必要に応じて更に保護層を順
次積層した電子写真感光体において、該中間層の端部表
面が該電荷発生層で覆われている(換言すれば、該中間
層のすべてが該電荷発生層で覆われている)ことを特徴
としている。[Means for Solving the Problems] The present invention provides an intermediate layer, a charge generation layer (CGL) on a conductive substrate.
In an electrophotographic photoreceptor in which a charge transport layer (CTL) and a protective layer are sequentially laminated as necessary, the end surface of the intermediate layer is covered with the charge generation layer (in other words, the intermediate layer (all of which are covered with the charge generation layer).
本発明者は、前記課題を達成するため種々検討した結果
、中間層の存在意義に注目した。即ち、中間層は樹脂層
の一つであり、この層は布電時、導電性基体に誘起され
た反対電荷の電荷発生層への注入を防止して帯電性を良
好ならしめるためのものである。As a result of various studies to achieve the above object, the inventors of the present invention focused on the significance of the existence of the middle class. That is, the intermediate layer is one of the resin layers, and this layer is intended to improve the charging property by preventing the opposite charge induced in the conductive substrate from being injected into the charge generation layer during electrification. be.
だが、低温低湿時に、この中間層が端部において露出し
ていると露出部では残留電位が高くなって現像剤が付着
し、地肌汚れをもたらす。また、現像剤の利用効率が低
下し、更には、現像剤が飛散する原因にもなる。これに
加えて、中間層が電荷発生層及び電荷輸送層で被覆され
ている中間部(感光体中央部)は、中間層が露出してい
る端部よりも残留電位は低くなる。その理由は電荷発生
層の形成の際に電荷発生層形成材料が中間層内に浸入す
るためと思われる。However, at low temperature and low humidity, if this intermediate layer is exposed at the edges, the residual potential will be high in the exposed areas, and the developer will adhere, resulting in background stains. Further, the efficiency of developer utilization is reduced, and furthermore, it becomes a cause for the developer to scatter. In addition, the residual potential of the intermediate portion (center portion of the photoreceptor) where the intermediate layer is covered with the charge generation layer and the charge transport layer is lower than that of the end portion where the intermediate layer is exposed. The reason for this is believed to be that the charge generation layer forming material permeates into the intermediate layer during formation of the charge generation layer.
こうした不利益は中間層端部を含めた全体を電荷発生層
で被覆するように形成せしめれば、前記の剥離やひび割
れを防止でき、更に感光体端部の残留電位は低く押えら
れ、良好な画像が得られるようになる。本発明はこうし
た知見のもとになされたものである。These disadvantages can be avoided by covering the entire intermediate layer, including the edges, with a charge generation layer, thereby preventing the above-mentioned peeling and cracking.Furthermore, the residual potential at the edges of the photoreceptor can be kept low, resulting in a good You can now obtain images. The present invention has been made based on this knowledge.
以下に本発明を添付の図面に従がいながらさらに詳細に
説明する。The invention will be explained in more detail below with reference to the accompanying drawings.
第1図及び第2図は本発明に係る電子写真感光体の代表
的な二側の断面図である。ここに付される引出し線番号
は第3図と同様であり、また、これら導電性基体11、
中間層12、感光層13(CGL131、CTL132
)、及び保護814を構成する材料や厚さは従来より知
られ又は用いられている感光体のものと何等相違してい
ない。1 and 2 are typical cross-sectional views of two sides of the electrophotographic photoreceptor according to the present invention. The leader line numbers attached here are the same as those in FIG. 3, and these conductive substrates 11,
Intermediate layer 12, photosensitive layer 13 (CGL131, CTL132
), and the material and thickness of the protection 814 are no different from those of conventionally known or used photoreceptors.
第1図及び第2図から明らかなように、本発明感光体に
おいては、中間層12の端部は電荷発生層131によっ
て完全に被覆されている。更に、好ましくは、中間層1
2の端部より内側に電荷輸送M132の端部が位置する
ようになっている(第1図)。そうした構造がとられる
(CGL131及びCTL132が重なったところ)こ
とによって明瞭な画像形成領域がつくられ、複写操作が
良好に行なえるようになる。As is clear from FIGS. 1 and 2, in the photoreceptor of the present invention, the ends of the intermediate layer 12 are completely covered with the charge generation layer 131. Furthermore, preferably, the intermediate layer 1
The end of the charge transport M132 is located inside the end of the charge transport M132 (FIG. 1). By adopting such a structure (where the CGL 131 and CTL 132 overlap), a clear image forming area is created and a copying operation can be performed well.
ここでの部は重量基準である。 Parts here are by weight.
実施例1
外径φ80mmのAQドラム(導電性基体)上のドラム
両端10mm以外の中央部に下記中間層塗工溶液をスプ
レー塗布して100℃で20分間加熱乾燥して約0.5
声厚の中間層を形成した。Example 1 The following intermediate layer coating solution was spray applied to the center of an AQ drum (conductive substrate) with an outer diameter of 80 mm outside the 10 mm of both ends of the drum, and dried by heating at 100° C. for 20 minutes to give a coating of about 0.5 mm.
Formed a middle layer with a thick voice.
(中間層塗工溶液)
アルコール可溶性ナイロン
(東し■製、CM−8000) 4
部メタノール 48部ブタ
ノール 48部次に、中
間層を形成したAQのドラム上のドラム両端9■以外の
中央部に、下記の電荷発生層塗工溶液をスプレー塗布し
て120℃で20分間加熱乾燥して約0.2pm厚の電
荷発生層を形成した。(Intermediate layer coating solution) Alcohol-soluble nylon (manufactured by Toshi ■, CM-8000) 4
Part methanol 48 parts Butanol 48 parts Next, on the AQ drum on which the intermediate layer was formed, the charge generation layer coating solution shown below was spray applied to the center of the drum except for both ends of the drum, and dried by heating at 120°C for 20 minutes. A charge generation layer having a thickness of about 0.2 pm was formed.
(電荷発生層塗工溶液)
下記構造式で表わされるアゾ顔料5部とシクロへキサノ
ン160部とを72時間ボールミルで混合して顔料分散
液を得、ついでこの顔料分散液100部に撹拌しながら
シクロヘキサノール90部を追加混合して電荷発生層塗
工液とした。(Charge generation layer coating solution) 5 parts of an azo pigment represented by the following structural formula and 160 parts of cyclohexanone were mixed in a ball mill for 72 hours to obtain a pigment dispersion, and then added to 100 parts of this pigment dispersion while stirring. 90 parts of cyclohexanol was additionally mixed to prepare a charge generation layer coating solution.
続いて、中間層及び電荷発生層を形成したAflドラム
上のドラム両端13mm以外の中央部に下記電荷輸送層
塗工液をスプレー塗布し、120℃で1時間加熱乾燥し
て約25雌の電荷輸送層を形成して、実施例1の電子写
真感光体とした。Subsequently, the following charge transport layer coating solution was spray-coated on the Afl drum on which the intermediate layer and the charge generation layer were formed, except for 13 mm from both ends of the drum, and dried by heating at 120°C for 1 hour to form a charge of approximately 25 mm. A transport layer was formed to obtain the electrophotographic photoreceptor of Example 1.
(電荷輸送層塗工溶液)
下記構造式で表わされるスチルベン系化合物ジベンゾ1
8クラウン6エーテル 0.03部テトラヒドロ
フラン 46部シクロへキサノン
46部実施例2
中間層、電荷発生層、電荷輸送層をそれぞれドラム両端
から14mm、10mm、13mm以外の中央部に形成
した以外は実施例1と同様にして実施例2の電子写真感
光体とした。(Charge transport layer coating solution) Stilbene compound dibenzo 1 represented by the following structural formula
8 crowns 6 ether 0.03 parts tetrahydrofuran 46 parts cyclohexanone
46 parts Example 2 The electrophotographic photoreceptor of Example 2 was prepared in the same manner as in Example 1, except that the intermediate layer, charge generation layer, and charge transport layer were formed in the center at distances other than 14 mm, 10 mm, and 13 mm from both ends of the drum, respectively. did.
比較例1
中間層、電荷発生層、電荷輸送層をそれぞれドラム両端
から10mm、12.5mm、13mm以外の中央部に
形成した以外は実施例1と同様にして比較例1の電子写
真感光体とした。Comparative Example 1 The electrophotographic photoreceptor of Comparative Example 1 was prepared in the same manner as in Example 1, except that the intermediate layer, charge generation layer, and charge transport layer were formed in the center at a distance other than 10 mm, 12.5 mm, and 13 mm from both ends of the drum, respectively. did.
これら3種の電子写真感光体(感光体ドラム)をトナー
を充填にした市販の電子写真複写機FT4820(リコ
ー社製)に装着して複写を行ったところ、実施例1及び
2の感光体ドラムを用いた場合は4000枚コピー後も
初期とほぼ同様の画像が得られたが、比較例1の感光体
ドラムを用いた場合は3500枚コピー後あたりから画
像濃度が低下し始めた。また、比較例1の感光体ドラム
を用いた場合は、実施例1及び2の感光体ドラムを用い
た場合と比較して、複写機内のトナー飛散が著しいもの
であった。When these three types of electrophotographic photoreceptors (photoreceptor drums) were installed in a commercially available electrophotographic copying machine FT4820 (manufactured by Ricoh Co., Ltd.) filled with toner and copies were made, it was found that the photoreceptor drums of Examples 1 and 2 When using the photosensitive drum of Comparative Example 1, the image density was almost the same as the initial image even after 4,000 copies were made, but when the photosensitive drum of Comparative Example 1 was used, the image density began to decrease after about 3,500 copies. Further, when the photosensitive drum of Comparative Example 1 was used, toner scattering inside the copying machine was significant compared to when the photosensitive drums of Examples 1 and 2 were used.
(1)請求項1に記載した電子写真感光体は中間層の端
部が電荷発生層の端部よりも内側に形成されており、中
間層が光導電性の電荷発生層で覆われている為残留電位
が小さく、従って、トナーの利用効率が高くかつ複写機
内でのトナー飛散が少ないといった効果がもたらされる
。(1) In the electrophotographic photoreceptor according to claim 1, the end of the intermediate layer is formed inside the end of the charge generation layer, and the intermediate layer is covered with a photoconductive charge generation layer. Therefore, the residual potential is small, and therefore the toner utilization efficiency is high and toner scattering within the copying machine is small.
(2)請求項2に記載した電子写真感光体は、請求項1
の効果に加えて、電荷輸送層の端部が中間層の端部より
も内側に形成されている為、電荷輸送層の剥離とひび割
れが生じにくいといった効果がもたらされる。(2) The electrophotographic photoreceptor described in claim 2 is the electrophotographic photoreceptor described in claim 1.
In addition to this effect, since the end of the charge transport layer is formed inside the end of the intermediate layer, the charge transport layer is less prone to peeling and cracking.
第1図及び第2図は本発明に係る電子写真感光体の代表
的な二側の断面図である。
第3図は比較の電子写真感光体の断面図である。
11・・・導電性基体
12・・・中間層
13・・・感光層
(131・・・電荷発生層、132・・・電荷輸送層)
14・・・保護層1 and 2 are typical cross-sectional views of two sides of the electrophotographic photoreceptor according to the present invention. FIG. 3 is a sectional view of a comparative electrophotographic photoreceptor. 11... Conductive substrate 12... Intermediate layer 13... Photosensitive layer (131... Charge generation layer, 132... Charge transport layer)
14...Protective layer
Claims (2)
、必要に応じて更に保護層を順次積層した電子写真感光
体において、該中間層の端部表面は該電荷発生層で覆わ
れていることを特徴とする電子写真感光体。(1) In an electrophotographic photoreceptor in which an intermediate layer, a charge generation layer, a charge transport layer, and a protective layer are sequentially laminated on a conductive substrate, the end surface of the intermediate layer is covered with the charge generation layer. An electrophotographic photoreceptor characterized by:
位置している請求項1に記載の電子写真感光体。(2) The electrophotographic photoreceptor according to claim 1, wherein the end portion of the charge transport layer is located inside the end portion of the intermediate layer.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP22958090A JPH04110857A (en) | 1990-08-30 | 1990-08-30 | Electrophotographic sensitive body |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP22958090A JPH04110857A (en) | 1990-08-30 | 1990-08-30 | Electrophotographic sensitive body |
Publications (1)
Publication Number | Publication Date |
---|---|
JPH04110857A true JPH04110857A (en) | 1992-04-13 |
Family
ID=16894411
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP22958090A Pending JPH04110857A (en) | 1990-08-30 | 1990-08-30 | Electrophotographic sensitive body |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPH04110857A (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6140004A (en) * | 1998-10-14 | 2000-10-31 | Imation Corp. | Organophotoreceptors for electrophotography featuring novel charge transport compounds |
JP2006259765A (en) * | 2006-05-11 | 2006-09-28 | Mitsubishi Chemicals Corp | Electrophotographic receptor and image forming apparatus using same |
JP2009229481A (en) * | 2008-03-19 | 2009-10-08 | Kyocera Mita Corp | Lamination type electrophotographic photoreceptor and image forming apparatus |
-
1990
- 1990-08-30 JP JP22958090A patent/JPH04110857A/en active Pending
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6140004A (en) * | 1998-10-14 | 2000-10-31 | Imation Corp. | Organophotoreceptors for electrophotography featuring novel charge transport compounds |
JP2006259765A (en) * | 2006-05-11 | 2006-09-28 | Mitsubishi Chemicals Corp | Electrophotographic receptor and image forming apparatus using same |
JP2009229481A (en) * | 2008-03-19 | 2009-10-08 | Kyocera Mita Corp | Lamination type electrophotographic photoreceptor and image forming apparatus |
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