CN101539726A

CN101539726A - Laminated electrophotographic photoreceptor and image forming device

Info

Publication number: CN101539726A
Application number: CN200810186196A
Authority: CN
Inventors: 大坪淳一郎; 东润; 窪岛大辅; 大川贤辅
Original assignee: Kyocera Mita Corp
Current assignee: Kyocera Document Solutions Inc
Priority date: 2008-03-19
Filing date: 2008-12-26
Publication date: 2009-09-23
Anticipated expiration: 2028-12-26
Also published as: CN101539726B; JP2009229481A

Abstract

The invention relates to a laminated electrophotographic photoreceptor and an image forming device with the same. A middle layer, an electric charge generating layer and an electric charge conveying layer are sequentially laminated on a substrate of the laminated electrophotographic photoreceptor. The laminated electrophotographic photoreceptor is characterized in that, at one tail end of the substrate at least, tail coating width of the middle layer is set to be d1 (mm), tail coating width of the electric charge generating layer is set to be d2 (mm) and tail coating width of the electric charge conveying layer is set to be d3 (mm). The d1, d2 and d3 meet the following relations (1) and (2): 0<=d1-d2< 5 (mm) (1); 0<=d3-d2<10 (mm) (2).

Description

Laminated electrophotographic photoreceptor and image processing system

Technical field

The present invention relates to laminated electrophotographic photoreceptor and the image processing system that possesses described photoreceptor.

Background technology

Electrophtography photosensor as image processing system etc., known have a laminated electrophotographic photoreceptor that possesses charge generating layer and charge transport layer on matrix, this charge generating layer contains charge generating and binding resin, and this charge transport layer contains charge transport agent and binding resin.

Above-mentioned laminated electrophotographic photoreceptor is compared with inorganic photoreceptor in the past, owing to make easily, and the selection kind of photosensitive materials such as charge generating, charge transport agent is varied, so have the big advantage of the degree of freedom of structural design.

But,,,, when forming these layers, can find the tendency of the relative attenuation of thickness of its upper end by dip coating because photographic layer forms by laminated multilayer as first problem for laminated electrophotographic photoreceptor.Consequently, found when exposure, to produce interference fringe, formed in the image and be easy to generate the such problem of Image Speckle.

In addition, for laminated electrophotographic photoreceptor, from improving the cementability between matrix and the charge generating layer, or the light that prevents to expose produce in the matrix surface reflection interference fringe aspect consider, can implement roughened to matrix surface usually.

But, in the case, second problem as laminated electrophotographic photoreceptor, if between matrix and charge generating layer, do not sandwich the middle layer, when then on matrix, forming charge generating layer, can find following problem: produce the stretching striped that caves at charge generating layer, become the reason that forms the image deflects in the image easily.

Therefore, in order to solve first problem, as shown in Figure 5, disclose that charge transport layer 222 covers the whole surface of charge generating layers 224 and the laminated electrophotographic photoreceptor 200 that forms (for example reference literature D1: the spy opens flat 5-11464 communique).

In addition, in order to solve second problem, laminated electrophotographic photoreceptor 300 is disclosed, this laminated electrophotographic photoreceptor 300 is when carrying out roughening to matrix surface, the content of the charge generating in the charge generating layer is defined in specialized range, and then, as shown in Figure 6, the uncoated width d2 in the upper end of uncoated width d1 in the upper end in middle layer 325 (mm) and charge generating layer 324 (mm) satisfies following formula (3) (for example reference literature D2: the patent documentation spy opens the 2004-205946 communique).

d2-d1≥0.5(mm) (3)

But,, found the tendency that middle layer, charge transport layer are peeled off from matrix or lower floor easily for the laminated electrophotographic photoreceptor of putting down in writing among document D1 and the D2.

Consequently, found following problem: the released part charge leakage in photographic layer forms in the image and is easy to generate image deflects.This point, promptly the problem of peeling off of matrix and each interlayer is compared with second problem with above-mentioned first problem, is more basic problem on the formation of laminated electrophotographic photoreceptor.

Thereby, before solving first problem and second problem, at first need to suppress effectively the technology of the laminated electrophotographic photoreceptor of peeling off of each interlayer of matrix, middle layer, charge generating layer, charge transport layer.

Summary of the invention

The object of the present invention is to provide laminated electrophotographic photoreceptor of peeling off that can suppress middle layer and charge transport layer effectively and the image processing system that carries this laminated electrophotographic photoreceptor.

An aspect of of the present present invention is a kind of laminated electrophotographic photoreceptor, its on matrix successively lamination middle layer, charge generating layer and charge transport layer, it is characterized in that, at least one end at matrix, when the uncoated width that the uncoated width that the uncoated width in middle layer is made as d1 (mm), charge generating layer is made as d2 (mm), charge transport layer was made as d3 (mm), d1～d3 satisfied following relational expression (1) and (2).

0≤d1-d2＜5(mm) (1)

0≤d3-d2＜10(mm) (2)

According to above-mentioned formation, satisfy relational expression (1) by d1 and d2, the charge generating layer that the end in middle layer can be laminated on it covers, and consequently can suppress the middle layer effectively and peel off from matrix surface.

In addition, satisfy relational expression (2) by d2 and d3, the charge transport layer that the end that can prevent charge generating layer and middle layer is laminated on it covers, and consequently can suppress charge transport layer effectively and peel off from charge generating layer.

Thereby, according to the present invention, satisfy relational expression (1) and (2) by d1～d3, can suppress peeling off of middle layer and charge transport layer effectively.In addition, the value of d1～d3 can be measured by for example using optical microscope and vernier caliper simultaneously.

For above-mentioned laminated electrophotographic photoreceptor, preferably contact with above-mentioned matrix in the end of the charge generating layer of at least one end of above-mentioned matrix.

According to above-mentioned formation, can more effectively suppress the middle layer and peel off from matrix surface.

For above-mentioned laminated electrophotographic photoreceptor, preferably with the binding resin of polyamide as the above-mentioned middle layer of formation; And the thickness in preferred above-mentioned middle layer is in 0.2～10 mu m range.

According to above-mentioned formation, when on the middle layer, forming charge generating layer, can be suppressed at the stretching striped that charge generating layer produces depression, can improve the cementability between middle layer and the matrix surface simultaneously.

For above-mentioned laminated electrophotographic photoreceptor, preferably with the binding resin of polyvinyl acetal resin as the formation charge generating layer; And the thickness of preferred above-mentioned charge generating layer is in 0.01～2 mu m range.

According to above-mentioned formation, can guarantee the electric charge generating capacity stipulated, simultaneously can raising and the cementability of middle layer and charge transport layer.

For above-mentioned laminated electrophotographic photoreceptor, preferably with the binding resin of polycarbonate resin as the formation charge transport layer; And the thickness of preferred above-mentioned charge transport layer is the value in 5～50 mu m ranges.

According to above-mentioned formation, can guarantee the charge delivery capability stipulated, can improve cementability simultaneously with charge generating layer.

For above-mentioned laminated electrophotographic photoreceptor, the charge generating layer that is preferred for forming charge generating layer comprises same solvent with coating fluid and the charge transport layer that is used to form charge transport layer with coating fluid.

According to above-mentioned formation, can further improve the cementability between charge generating layer and the charge transport layer.

For above-mentioned laminated electrophotographic photoreceptor, preferred above-mentioned solvent is a tetrahydrofuran.

According to above-mentioned formation, can further improve the cementability between charge generating layer and the charge transport layer, can form charge generating layer and charge transport layer more equably respectively simultaneously.

For above-mentioned laminated electrophotographic photoreceptor, preferred interlayer, charge generating layer and charge transport layer all form by dip coating.

According to above-mentioned formation, can easily regulate the uncoated width of each layer, therefore can more easily satisfy above-mentioned relation formula (1) and (2).

For above-mentioned laminated electrophotographic photoreceptor, preferred above-mentioned d1～d3 satisfies following relational expression (1 ') and (2 ').

0≤d1-d2＜4(mm) (1′)

0≤d3-d2＜7(mm) (2′)

According to above-mentioned formation, satisfy above-mentioned relation formula (1 ') by d1 and d2, making charge generating layer is suitable length to the part that matrix surface directly forms, the electric leakage of the photographic layer in the time of can suppressing to implement to print lastingly.In addition, satisfy above-mentioned relation formula (2 ') by d2 and d3, making the part that is not covered by charge transport layer of charge generating layer is suitable length, the electric leakage of the photographic layer in the time of can suppressing to implement to print lastingly.

Another aspect of the invention is a kind of image processing system, it disposes live part, developing parts and transfer member around Electrophtography photosensor, it is characterized in that Electrophtography photosensor is above-mentioned laminated electrophotographic photoreceptor.

According to above-mentioned formation, owing to be equipped with the laminated electrophotographic photoreceptor of peeling off that has suppressed middle layer and charge transport layer, thereby can suppress the leakage that being accompanied by in the photographic layer peeled off the electric charge of generation, can suppress to form the generation of the image deflects in the image effectively.

Description of drawings

Fig. 1 is the schematic cross-section of an example of the laminated electrophotographic photoreceptor of expression first embodiment of the present invention;

Fig. 2 is for illustrating d1-d2 and the middle layer chart from the relation of the fissility of matrix;

Fig. 3 is for illustrating d3-d2 and the charge transport layer chart from the relation of the fissility of charge generating layer;

Fig. 4 is the schematic cross-section of expression image processing system of the present invention;

Fig. 5 is the schematic cross-section of an example of the existing laminated electrophotographic photoreceptor of expression;

Fig. 6 is the schematic cross-section of an example of the existing laminated electrophotographic photoreceptor of expression.

Embodiment

At first, the inventor finds: for laminated electrophotographic photoreceptor, satisfy prescribed relationship by uncoated width, the uncoated width of charge generating layer and the uncoated width of charge transport layer in the middle layer of at least one end of matrix, the cementability of matrix and each interlayer can be improved, peeling off of middle layer and charge transport layer can be suppressed effectively.

[first embodiment]

The laminated electrophotographic photoreceptor of first embodiment of the present invention be on matrix successively lamination the laminated electrophotographic photoreceptor of middle layer, charge generating layer and charge transport layer, at least one end at matrix, when the uncoated width that the uncoated width that the uncoated width in middle layer is made as d1 (mm), charge generating layer is made as d2 (mm), charge transport layer was made as d3 (mm), d1～d3 satisfied following relational expression (1) and (2).

0≤d1-d2＜5(mm) (1)

0≤d3-d2＜10(mm) (2)

Below, the laminated electrophotographic photoreceptor of present embodiment is specifically described.

＜basic comprising 〉

As shown in Figure 1, the laminated electrophotographic photoreceptor of present embodiment be on matrix 12 successively lamination the laminated electrophotographic photoreceptor 111 of middle layer 25, charge generating layer 24 and charge transport layer 22, at least one end at matrix 12, when the uncoated width that the uncoated width that the uncoated width in middle layer 25 is made as d1 (mm), charge generating layer 24 is made as d2 (mm), charge transport layer 22 was made as d3 (mm), d1～d3 satisfied following relational expression (1) and (2).

0≤d1-d2＜5(mm) (1)

0≤d3-d2＜10(mm) (2)

In addition, Fig. 1 is the schematic cross-section of an example of the laminated electrophotographic photoreceptor 111 of expression present embodiment.

1, matrix

Matrix of the present invention can use the various materials with electric conductivity.The matrix that can illustration for example forms with metals such as iron, aluminium, copper, tin, platinum, silver, vanadium, molybdenum, chromium, cadmium, titanium, nickel, palladium, indium, stainless steel and brass; Evaporation or lamination the matrix that forms of the plastic material of above-mentioned metal; Perhaps use the glass matrix of coverings such as silver iodide, alumite, tin oxide and indium oxide etc.

That is, can be that matrix self has electric conductivity, perhaps the surface of matrix has electric conductivity.In addition, matrix is preferably the matrix that has sufficient mechanicalness intensity in use.

In addition, the shape of matrix is according to the structure of the image processing system that uses, and can be any one of sheet and drum type etc.And the preferred substrate surface is through roughened.Its reason is that the light that can prevent to expose produces interference fringe in the matrix surface reflection, and can suppress to form the generation of the Image Speckle in the image effectively.

The roughened that is used to carry out above-mentioned roughening can be enumerated the grinding that for example utilizes grinding stone, the grinding that utilizes sand belt, etching, centreless grinding and honing processing etc.

2, middle layer

(1) binding resin

The binding resin that is used for middle layer of the present invention can be enumerated independent one or more the combination of for example polyamide, polyvinyl alcohol resin, polyvinyl butyral resin, vinyl-formal resin, vinyl acetate resin, phenoxy resin, vibrin and acryl resin etc.

In addition, especially preferably use polyamide in the above-mentioned resin.

Its reason is if select polyamide especially for use, when then forming charge generating layer on the middle layer, can be suppressed at the stretching striped that charge generating layer produces depression, and can improve the cementability between middle layer and the matrix surface.

(2) adjuvant

In addition,, produce light scattering, perhaps realize dispersed purposes such as raising, also preferably a small amount of various adjuvants (organic micropowder end or inorganic micro powder end) that add to prevent to interfere striped for the scope of the problems such as sedimentation when not producing manufacturing.

Particularly, Chinese whites such as titanium dioxide, zinc paste, zinc sulphide, basic lead carbonate, inorganic pigments such as aluminium oxide, lime carbonate, barium sulphate, fluororesin particle, benzoguanamine resin particle, styrene resin particle etc. are preferred additives.

In addition, during the adjuvant of interpolation micropowder etc., preferably its particle diameter is the value in 0.01～3 mu m range.Its reason is, if above-mentioned particle diameter is excessive, then exists the concavo-convex of middle layer can become big, perhaps produces uneven part on the electricity, and then is easy to generate the situation of image quality defective.On the other hand, if above-mentioned particle diameter is too small, then there is the situation that can not get sufficient light scattering effect.

And when adding the adjuvant of micropowder etc., the solid constituent in its relative middle layer of addition is preferably 10 weight %～90 weight % in weight ratio, more preferably 20 weight %～80 weight %.

(3) thickness

In addition, the thickness in middle layer is preferably the value in 0.2～10 mu m range.

Its reason is, the thickness by making the middle layer when forming charge generating layer on the middle layer, can be suppressed at the stretching striped that charge generating layer produces depression, and can improve the cementability between middle layer and the matrix surface in above-mentioned scope.

That is,, then exist the concavo-convex disguise of matrix surface to reduce, be easy to generate the situation of the stretching striped of depression at charge generating layer because if the thickness in middle layer is the value of less than 0.2 μ m.On the other hand,, then there is the bonding force that reduces easily between middle layer and the matrix surface because if the thickness in middle layer is the value above 10 μ m, and the excessive easily situation about rising of rest potential.

Thereby the thickness in middle layer is the interior value of 0.3～9 mu m range more preferably, more preferably the value in 0.5～7 mu m range.

3, charge generating layer

(1) binding resin

In addition, the binding resin that is used for charge generating layer can be enumerated independent one or more the combination of the polycarbonate resin, vibrin, methacrylic resin, acryl resin, Corvic, polystyrene resin, polyvinyl acetal resin, Styrene-Butadiene resin, vinylidene chloride-acrylonitrile copolymer resin, vinyl chloride-vinyl acetate copolymer resin, organic siliconresin, silicone alkyd, phenolics, Polyvinyl carbazole etc. of bisphenol A-type, bisphenol Z type or bisphenol-c type etc.In addition, especially preferably use polyvinyl acetal resin in the above-mentioned resin.

Its reason is, if select polyvinyl acetal resin especially for use, then can disperse charge generating effectively and guarantees the electric charge generating capacity of q.s, simultaneously can raising and the cementability of middle layer and charge transport layer.

(2) charge generating

In addition, charge generating can be used present known charge generating.

Can enumerate for example phthualocyanine pigment, the perylene series pigments, disazo pigment, the diketopyrrolo-pyrrole series pigments, no metal naphthalene phthalocyanine series pigments, the metal naphthalene phthalocyanine series pigments, the sour series pigments in side, the trisazo-series pigments, indigo series pigments, azulenes series pigments (azulenium type pigment), the cyanine series pigments, the pyrans series pigments, the anthanthrone series pigments, the triphenylmethane series pigments, intellectual circle's series pigments, the toluidine series pigments, the pyrazoline series pigments, the organic light-guide electricity body that quinacridone pigment is such; Independent one or more the potpourri of inorganic smooth conductive agent that selenium, selenium-tellurium, selenium-arsenic, cadmium sulfide, amorphous silicon are such etc.

In addition, binding resin 100 weight portions of relative charge generating layer, the addition of charge generating are preferably the value in 5～1000 weight portion scopes.Its reason is that if relative binding resin 100 weight portions, above-mentioned content is the value of less than 5 weight portions, then has electric charge generating capacity deficiency, is difficult to form the situation of distinct electrostatic latent image.On the other hand, if relative binding resin 100 weight portions, then there is the situation that is difficult to form uniform charge generating layer in above-mentioned content for surpassing the value of 1000 weight portions.

Thereby, constituting binding resin 100 weight portions of charge generating layer relatively, the content of charge generating is the value in 30～500 weight portion scopes more preferably.

(3) thickness

In addition, the thickness of charge generating layer is preferably the value in 0.01～2 mu m range.Its reason is, the thickness by making charge generating layer in above-mentioned scope, though also be subjected to the content influence of charge generating, can be in the electric charge generating capacity of guaranteeing to stipulate, the cementability of raising and middle layer and charge transport layer.

That is,, then exist and be difficult to fully contain charge generating, and be difficult to form the situation of uniform films if the thickness of charge generating layer is the value of less than 0.01 μ m.On the other hand, if then there is the cementability that reduces especially easily between middle layer and the charge generating layer in the thickness of charge generating layer for surpassing the value of 2 μ m, and the excessive easily situation about rising of rest potential.

Thereby the thickness of charge generating layer is the interior value of 0.02～1.7 mu m range more preferably, more preferably the value in 0.03～1.5 mu m range.

4, charge transport layer

(1) binding resin

In addition, the binding resin that is used for charge transport layer can be enumerated organic conductive polymkeric substance such as the insulative resin such as polycarbonate resin, polystyrene, acrylonitritrile-styrene resin, acrylonitrile-butadiene copolymer, polyvinyl butyral, polyvinyl formal, polysulfones, polyacrylamide, polyamide, chlorinated rubber of acryl resin, polyarylate, vibrin, bisphenol A-type, bisphenol Z type or bisphenol-c type etc. or Polyvinyl carbazole, polyvinyl anthracene, polyvinyl pyrene etc. and their copolymer resin.In addition, especially preferably use polycarbonate resin in the above-mentioned resin.Its reason is, if select polycarbonate resin especially for use, then can disperse the charge transport agent effectively, in the charge delivery capability of guaranteeing to stipulate, can improve the cementability with charge generating layer.

(2) charge transport agent

In addition, charge transport agent (cavity conveying agent and electron transporting agent) can Lie Ju oxadiazole derivant, pyrazoline derivative, aromatic series uncle amino-compound, aromatic series uncle diamino compounds, pyrrolotriazine derivatives, hydazone derivative, quinazoline derivant, benzofuran derivatives, stilbene derivative, enamine derivates, carbazole derivates, the quinone based compound, the Fluorenone compound, the xanthone compound, thiophene compound, electron transport materials such as diphenoquinone compound, and independent one or more the combination that has the polymkeric substance etc. of the group that above-claimed cpd constitutes at main chain or side chain.

In addition, binding resin 100 weight portions of relative charge transport layer, the addition of charge transport agent are preferably the value in 20～500 weight portion scopes.

Its reason is that if relative binding resin 100 weight portions, above-mentioned content is the value of less than 20 weight portions, then has the cavity conveying scarce capacity, is difficult to form the situation of distinct electrostatic latent image.On the other hand, if relative binding resin 100 weight portions, then there is the situation that is difficult to form uniform charge transport layer in above-mentioned content for surpassing the value of 500 weight portions.

Thereby, constituting binding resin 100 weight portions of charge transport layer relatively, the content of charge transport agent is the value in 30～200 weight portion scopes more preferably, more preferably the value in 40～100 weight portion scopes.

(3) thickness

In addition, the thickness of charge transport layer is preferably the value in 5～50 mu m ranges.Its reason is, the thickness by making charge transport layer though also be subjected to the content influence of charge transport agent, can improve the cementability with charge generating layer in the charge delivery capability of guaranteeing to stipulate in above-mentioned scope.

That is,, then exist to be difficult to fully contain the charge transport agent, and be difficult to form the situation of uniform films if the thickness of charge transport layer is the value of less than 5 μ m.On the other hand, if the thickness of charge transport layer is the value that surpasses 50 μ m, then there is the situation of the cementability of reduction easily and charge generating layer.

Thereby the thickness of charge transport layer is the interior value of 7～45 mu m ranges more preferably, more preferably the value in 10～40 mu m ranges.

5, uncoated width

Laminated electrophotographic photoreceptor of the present invention is characterised in that, as shown in Figure 1, at least one end at matrix 12, when the uncoated width that the uncoated width that the uncoated width in middle layer 25 is made as d1 (mm), charge generating layer 24 is made as d2 (mm), charge transport layer 22 was made as d3 (mm), d1～d3 satisfied following relational expression (1) and (2).

0≤d1-d2＜5(mm) (1)

0≤d3-d2＜10(mm) (2)

Its reason is, satisfies relational expression (1) by d1 and d2, and the charge generating layer 24 that the end in middle layer 25 can be laminated on it covers, and consequently can suppress middle layer 25 effectively from matrix 12 sur-face peelings.

In addition, satisfy relational expression (2) by d2 and d3, the charge transport layer 22 that the end that can prevent charge generating layer 24 and middle layer 25 is laminated on it covers, and consequently can suppress charge transport layer 22 effectively and peel off from charge generating layer 24.

Thereby, according to the present invention, satisfy relational expression (1) and (2) by d1～d3, can suppress peeling off of matrix and each interlayer effectively.

That is, because if the value of d1-d2 is the value of not enough 0mm, then the end in middle layer is not covered by charge generating layer, thereby parts such as the end in middle layer and cleaning balde directly contact, the situation that exists the middle layer to peel off from matrix surface easily when lasting printing.

For this point, can infer: if the value of d1-d2 is the above value of 0mm, then the end in middle layer is covered by charge generating layer, thereby compare with the situation that the end in middle layer exposes, this terminal surfaceness reduces, become evenly with contacting of parts such as cleaning balde, peel off from matrix surface so can suppress the middle layer effectively.

On the other hand, because if the value of d1-d2 is the above value of 5mm, though then the end in middle layer is covered by charge generating layer, charge generating layer excessively increases the part that matrix surface directly forms, when implementing lasting the printing, exist the situation that is easy to generate electric leakage at photographic layer.

Thereby d1 and d2 more preferably satisfy following relational expression (1 '), further preferably satisfy following relational expression (1 ").

0≤d1-d2＜4(mm) (1′)

0≤d1-d2＜3(mm) (1″)

In addition, if the value of d3-d2 is the value of not enough 0mm, then the end in charge generating layer and middle layer is covered by charge transport layer, thereby charge transport layer can directly contact with matrix or middle layer.

At this moment and since charge transport layer to the adaptation in matrix or middle layer less than adaptation to charge generating layer, thereby its end portion peel off from lower floor easily, on this basis, exist charge transport layer easily from the situation of charge generating layer sur-face peeling.

On the other hand, if the value of the d3-d2 above value that is 10mm, though then the end in charge generating layer and middle layer would not be covered by charge transport layer, but for lower floor, the part that is covered by charge transport layer does not excessively increase, and when implementing lasting the printing, exists photographic layer to be easy to generate the situation of electric leakage.

Thereby d2 and d3 more preferably satisfy following relational expression (2 '), further preferably satisfy following relational expression (2 ").

0≤d3-d2＜7(mm) (2′)

0≤d3-d2＜5(mm) (2″)

In addition, be that the flange most cases that is assembled into the photosensitive drums both ends is that an end has gear structure as long as satisfy the reason that above-mentioned relation formula (1) and (2) get final product at least one end.

That is, for the flange of the side with gear structure, when the operation carried out when image processing system is assembled etc., the operator can easily hold said gear portion and stably operate.With respect to this, do not have a side's of gear flange, the place that the operator can hold is few, and hand is touched the end of photographic layer easily when operation, the perhaps end of the easy tactility photosphere of the internal part of image processing system, thus be easy to generate peeling off of matrix and each interlayer.

Thereby, do not have the end of flange one side of gear at least in assembling, satisfying the mode laminated photosensitive layer of relational expression (1) and (2), thereby can suppress peeling off of matrix and each interlayer effectively.

In addition, for the value of d1～d3, except that satisfying relational expression (1) and (2),, but preferably be respectively the interior value of 0.1～10mm scope, the more preferably value in 0.3～5mm scope as long as the value that is respectively in the common scope just is not particularly limited.

In addition, laminated electrophotographic photoreceptor of the present invention preferably contacts with matrix in the end of the charge generating layer of at least one end of matrix.

Its reason is, covers the end in middle layer by the end of charge generating layer, and contacts with matrix, can more effectively suppress the middle layer and peel off from matrix surface.

That is, the end by charge generating layer covers the end in middle layer, can reduce the friction with parts such as cleaning balde more effectively.

Then, use Fig. 2 that the value of d1-d2 (mm) and the relation of peeling off between matrix and middle layer are described.

Fig. 2 is explanation d1-d2 (mm) and the chart of middle layer from the relation of the fissility of matrix.In addition, transverse axis is represented d1-d2 (mm), and the longitudinal axis is represented the evaluation (relative value) of the fissility between matrix and middle layer.At this moment, the value of d3-d2 is fixed on certain value (0.6mm).

In addition, the evaluation of above-mentioned fissility (relative value) is carried out according to following metewand.

100: also do not confirm peeling off of middle layer by 30,000 paper.

90: confirming peeling off of middle layer by in the process of 27,001～30,000 paper.

80: confirming peeling off of middle layer by in the process of 24,001～27,000 paper.

70: confirming peeling off of middle layer by in the process of 21,001～24,000 paper.

60: confirming peeling off of middle layer by in the process of 18,001～21,000 paper.

50: confirming peeling off of middle layer by in the process of 15,001～18,000 paper.

40: confirming peeling off of middle layer by in the process of 12,001～15,000 paper.

30: confirming peeling off of middle layer by in the process of 9,001～12,000 paper.

20: confirming peeling off of middle layer by in the process of 6,001～9,000 paper.

10: confirming peeling off of middle layer by in the process of 3,001～6,000 paper.

0: confirming peeling off of middle layer by in the process of 1～3,000 paper.

From the family curve of Fig. 2 as can be known, the value of d1-d2 along with it increases, though the evaluation of fissility is risen, does not reach the level the peeled off (relative evaluation: 100) of affirmation less than the middle layer when the scope of not enough 0mm.On the other hand, as can be known: the value of d1-d2 can stably keep confirming the level of peeling off less than the middle layer when the above scope of 0mm.

Thereby as can be known: by the value that makes d1-d2 is value more than the 0mm, can suppress peeling off of middle layer in criticality ground.

Then, use Fig. 3 that the value of d3-d2 (mm) and the relation of peeling off of charge generating layer and charge transport interlayer are described.Fig. 3 is explanation d3-d2 (mm) and the chart of charge transport layer from the relation of the fissility of charge generating layer.In addition, transverse axis is represented d3-d2 (mm), and the longitudinal axis is represented the evaluation (relative value) of the fissility of charge generating layer and charge transport interlayer.

At this moment, the value of d1-d2 is fixed on certain value (0.6mm).

100: also do not confirm peeling off of charge transport layer by 30,000 paper.

90: confirming peeling off of charge transport layer by in the process of 27,001～30,000 paper.

80: confirming peeling off of charge transport layer by in the process of 24,001～27,000 paper.

70: confirming peeling off of charge transport layer by in the process of 21,001～24,000 paper.

60: confirming peeling off of charge transport layer by in the process of 18,001～21,000 paper.

50: confirming peeling off of charge transport layer by in the process of 15,001～18,000 paper.

40: confirming peeling off of charge transport layer by in the process of 12,001～15,000 paper.

30: confirming peeling off of charge transport layer by in the process of 9,001～12,000 paper.

20: confirming peeling off of charge transport layer by in the process of 6,001～9,000 paper.

10: confirming peeling off of charge transport layer by in the process of 3,001～6,000 paper.

0: confirming peeling off of charge transport layer by in the process of 1～3,000 paper.

From the family curve of Fig. 3 as can be known, the value of d3-d2 along with it increases, though the evaluation of fissility is risen, does not reach the level the peeled off (relative evaluation: 100) of affirmation less than charge transport layer when the scope of not enough 0mm.On the other hand, as can be known: the value of d3-d2 can stably keep confirming the level of peeling off less than charge transport layer when the above scope of 0mm.

Thereby as can be known: by the value that makes d3-d2 is value more than the 0mm, can suppress peeling off of charge transport layer in criticality ground.

6, manufacture method

(1) preparation of matrix

In order to prevent the generation of interference fringe, preferred employing for example utilizes methods such as the grinding of grinding stone, the grinding that utilizes sand belt, etching, centreless grinding and honing processing that roughened is carried out on the surface of support substrate.

(2) formation in middle layer

When forming the middle layer, preferably in the solution that has dissolved resinous principle, add titanium dioxide etc., and carry out dispersion treatment and make coating fluid.

In addition, the method for carrying out dispersion treatment is not particularly limited, but preferably uses generally well-known roller mill, bowl mill, vibromill, vertical ball mill, sand mill, rubber mill and coating vibrator etc.

In addition, be not particularly limited, but can use rubbing methods such as dip coating, spraying process, drop rubbing method, knife coating, rolling method for the coating process of middle layer with coating fluid.

In addition, in the present invention, owing to need regulate the uncoated width of middle layer, charge generating layer and charge transport layer, so, especially preferably use dip coating in order easily to regulate above-mentioned uncoated width.

And, in order more stably to form middle layer and the photographic layer on it, be preferably in the coating middle layer with after the coating fluid, handle at 30～200 ℃ of heat dryings of implementing 5 minutes～2 hours down.

(3) formation of charge generating layer

In addition, when forming charge generating layer, in the solution that has dissolved resinous principle, add charge generating etc., and carry out dispersion treatment and make coating fluid.

In addition, the method for carrying out dispersion treatment is not particularly limited, but preferably uses generally well-known roller mill, bowl mill, vertical ball mill, coating vibrator, ultrasonic dispersing machine etc. to carry out dispersing and mixing, forms coating fluid.

In addition, dip coating is similarly preferably used in coating process and above-mentioned middle layer.

In addition, preferably after painting process, in drying process, use high-temperature drier or drying under reduced pressure machine etc., for example under 60 ℃～150 ℃ baking temperatures, carry out drying.

[second embodiment]

Second embodiment of the present invention is a kind of image processing system, and it disposes live part, developing parts and transfer member around Electrophtography photosensor, and wherein, described Electrophtography photosensor is above-mentioned laminated electrophotographic photoreceptor.And this image processing system disposes above-mentioned live part, developing parts and transfer member around Electrophtography photosensor.

Below, be the center with the content different with the explanation of first embodiment, use Fig. 4 to be specifically described.

Fig. 4 is the schematic cross-section of the image processing system of second embodiment of the present invention.The image processing system of second embodiment of the present invention is for example compounding machine or printer.

At first, the laminated electrophotographic photoreceptor 111 that makes image processing system 100 is after the direction shown in the arrow A is rotated with predetermined process speed (peripheral speed), and its surface is charged to stipulating current potential (negative polarity) by live part 112.And, in Fig. 4, use charged roller as live part 112.

Then, carry out optical modulation according to image information on one side by exposure component 113, by catoptron etc. the surface of laminated electrophotographic photoreceptor 111 exposed on one side.By this exposure, form electrostatic latent image on the surface of laminated electrophotographic photoreceptor 111.

Then, based on this electrostatic latent image, carry out image development by developing parts 114.The inside of this developing parts 114 accommodates toner, the electrostatic latent image on the corresponding laminated electrophotographic photoreceptor of this toner 111 surfaces and adhering to, thus form toner image.

In addition, recording chart 120 is transported to laminated electrophotographic photoreceptor 111 bottoms along the transfer printing transport path of regulation.At this moment, by between laminated electrophotographic photoreceptor 111 and transfer member 115, applying the transfer bias of regulation, can be on recording chart 120 the transfer printing toner image.

Then, the recording chart 120 behind the transfer printing toner image from laminated electrophotographic photoreceptor 111 surface isolation, is transported to fuser by conveying belt by separating component (not shown).Then, carry out heating and pressurizing by this fuser and handle the back toner image, output to the outside of image processing system 100 again by outlet roller to the surface.

On the other hand, laminated electrophotographic photoreceptor 111 former states ground behind the transfer printing toner image continues rotation, and the residual toner (attachment) that is not transferred to recording chart 120 during transfer printing is removed by the surface of cleaning device 117 from laminated electrophotographic photoreceptor 111.

And as mentioned above, laminated electrophotographic photoreceptor 111 forms in its at least one end, and the uncoated width of middle layer, charge generating layer and charge transport layer satisfies prescribed relationship.

Thereby, in laminated electrophotographic photoreceptor, can suppress peeling off of matrix and each interlayer effectively.Consequently, the charge leakage that being accompanied by in the photographic layer peeled off generation can be suppressed, and the generation of the image deflects in the image can be suppressed to form effectively.

[embodiment]

Below, the present invention is described in detail according to embodiment.

[embodiment 1]

1, the manufacturing of laminated electrophotographic photoreceptor

(1) formation in middle layer

In container, add and carried out surface-treated titanium dioxide (TAYCACorporation system with aluminium oxide and silicon dioxide, MT-02, number average primary particle size: 10nm) 250 weight portions, ethanol 1000 weight portions, normal butyl alcohol 250 weight portions and copolymerization polyamide (DAICEL Degussa Limited system, X1010) after 100 weight portions, using coating vibrator to mix disperseed 10 hours, and then carry out filtration treatment with 5 microns filtrator, form the middle layer coating fluid.

Then, make diameter 30mm, long 238.5mm aluminum substrate (support substrate) an end upwards, in the middle layer that obtains with in the coating fluid with the speed dip coated (dip coating) of 5mm/s.Afterwards, be cured processing under the condition, formed the middle layer of thickness 2 μ m at 130 ℃, 30 minutes.Uncoated width d1 in the middle layer of matrix upper end when at this moment, carrying out dip coating is 1.0mm.

(2) formation of charge generating layer

Then, in container, add titanyl phthalocyanine crystallization 100 weight portions as charge generating, as polyvinyl acetal resin (ponding chemistry (strain) system of binding resin, KS-5Z) after 100 weight portions, propylene glycol monomethyl ether 2000 weight portions and tetrahydrofuran 6000 weight portions as dispersion medium, use bowl mill to disperse 48 hours, and then carry out filtration treatment with 3 microns filtrator, form the charge generating layer coating fluid.Then, utilize dip coating to be applied on the middle layer with coating fluid the charge generating layer that obtains, carried out drying under the condition, form the charge generating layer of thickness 0.3 μ m at 80 ℃, 5 minutes.

Uncoated width d2 at the charge generating layer of matrix upper end when at this moment, carrying out dip coating is 0.4mm.

(3) formation of charge transport layer

Then, receive as cavity conveying agent (HTM-1) 70 weight portions by following formula (1) expression of cavity conveying agent in container contents, (Supreme Being people changes into (strain) system as the polycarbonate resin of binding resin, TS2020) after 100 weight portions and tetrahydrofuran 460 weight portions as solvent, carry out 10 minutes dispersion treatment with ultrasonic dispersing machine, form the charge transport layer coating fluid.Then, the charge transport layer that obtains similarly is coated with on charge generating layer with coating fluid with coating fluid and charge generating layer, after 130 ℃, 30 minutes carry out drying under the condition, form the charge transport layer of thickness 20 μ m, thereby obtain laminated electrophotographic photoreceptor.Uncoated width d3 at the charge transport layer of matrix upper end when at this moment, carrying out dip coating is 1.1mm.

2, fissility evaluation

The laminated electrophotographic photoreceptor that obtains has been implemented the fissility evaluation.

That is, the laminated electrophotographic photoreceptor that obtains is carried printer (OKI DATACorporation system, Microline 22), 30,000 blank sheet of paper are passed through.

At this moment, whenever pass through 1,000, estimate according to following benchmark with whether peeling off in the Visual Confirmation photographic layer.The result who obtains is illustrated in the table 1.

Zero: all do not confirm and peel off at any one layer.

△: during by the paper more than 20,000, confirm peeling off of any one deck.

*: during paper by 20,000 of less thaies, confirm peeling off of any one deck.

[embodiment 2～20 and comparative example 1～9]

In embodiment 2～20 and the comparative example 1～9, when making laminated electrophotographic photoreceptor, (as shown in table 1 respectively change of d1～d3) in addition made laminated electrophotographic photoreceptor similarly to Example 1 and estimated with the uncoated width of middle layer, charge generating layer and charge transport layer.The result who obtains is illustrated in the table 1.

[table 1]

As known from Table 1, the uncoated width in middle layer is made as d1 (mm), the uncoated width of charge generating layer is made as d2 (mm), when the uncoated width of charge transport layer is made as d3 (mm), the situation (embodiment 1～20) that d1～d3 satisfies above-mentioned relation formula (1) and (2) and the situation that does not satisfy above-mentioned relation formula (1) (comparative example 3～8), the situation (comparative example 1,2,8,9) that does not satisfy above-mentioned relation formula (2), the situation (comparative example 8) that does not satisfy above-mentioned relation formula (1) and (2) are compared, and can suppress peeling off of middle layer and charge transport layer effectively.In addition, electric leakage on the charge generating layer does not take place in embodiment 1～13 and embodiment 15～18 among the embodiment in carrying out by the test of 30,000 paper.Embodiment 14 is because charge generating layer is more to the part that matrix surface directly forms, so at the duration of test by 20,000～30,000 paper, produced electric leakage in the photographic layer end, but do not reached the degree that influences image.Embodiment 19 and embodiment 20 are because charge generating layer is not more by the part that charge transport layer covers, so at the duration of test by 20,000～30,000 paper, produced electric leakage in the photographic layer end, but do not reached the degree that influences image.

In addition, only satisfy the situation (comparative example 3～7) of above-mentioned relation formula (2), only satisfy the situation (comparative example 1,2,9) of above-mentioned relation formula (1), peeling off of any one deck all taken place.

According to laminated electrophotographic photoreceptor of the present invention and image processing system, when the uncoated width that is made as d2 (mm), above-mentioned charge transport layer by the uncoated width that the uncoated width in above-mentioned middle layer is made as d1 (mm), above-mentioned charge generating layer at least one end of above-mentioned matrix is made as d3 (mm), above-mentioned d1～d3 satisfies above-mentioned relation formula (1) and (2), can suppress peeling off of middle layer and charge transport layer effectively.Thereby laminated electrophotographic photoreceptor of the present invention and image processing system wait in expectation the long lifetime of various image processing systems such as duplicating machine, printer, compounding machine are made remarkable contribution.

Claims

1, a kind of laminated electrophotographic photoreceptor, its on matrix successively lamination middle layer, charge generating layer and charge transport layer, it is characterized in that, at least one end at described matrix, when the uncoated width that the uncoated width that the uncoated width in described middle layer is made as d1 (mm), described charge generating layer is made as d2 (mm), described charge transport layer was made as d3 (mm), described d1～d3 satisfied following relational expression (1) and (2).

0≤d1-d2＜5(mm) (1)

0≤d3-d2＜10(mm) (2)。

2, laminated electrophotographic photoreceptor according to claim 1 wherein, contacts with described matrix in the end of the described charge generating layer of at least one end of described matrix.

3, laminated electrophotographic photoreceptor according to claim 1, wherein, with the binding resin of polyamide as the described middle layer of formation.

4, according to claim 1 or 3 described laminated electrophotographic photoreceptors, wherein, the thickness in described middle layer is in 0.2～10 mu m range.

5, laminated electrophotographic photoreceptor according to claim 1, wherein, with the binding resin of polyvinyl acetal resin as the described charge generating layer of formation.

6, laminated electrophotographic photoreceptor according to claim 1 or 5, wherein, the thickness of described charge generating layer is in 0.01～2 mu m range.

7, laminated electrophotographic photoreceptor according to claim 1, wherein, with the binding resin of polycarbonate resin as the described charge transport layer of formation.

8, according to claim 1 or 7 described laminated electrophotographic photoreceptors, wherein, the thickness of described charge transport layer is in 5～50 mu m ranges.

9, laminated electrophotographic photoreceptor according to claim 1, wherein, the charge generating layer that is used to form described charge generating layer comprises same solvent with coating fluid and the charge transport layer that is used to form described charge transport layer with coating fluid.

10, laminated electrophotographic photoreceptor according to claim 9, wherein, described solvent is a tetrahydrofuran.

11, laminated electrophotographic photoreceptor according to claim 1, wherein, described middle layer, described charge generating layer and described charge transport layer all form by dip coating.

12, laminated electrophotographic photoreceptor according to claim 1, wherein, described d1～d3 satisfies following relational expression (1 ') and (2 ').

0≤d1-d2＜4(mm) (1′)

0≤d3-d2＜7(mm) (2′)

13, a kind of image processing system, it disposes live part, developing parts and transfer member around Electrophtography photosensor, it is characterized in that described Electrophtography photosensor is any described laminated electrophotographic photoreceptor in the claim 1～12.