CN103034077A - Electropositive single layer type electrophotographic photoconductor and image forming device - Google Patents
Electropositive single layer type electrophotographic photoconductor and image forming device Download PDFInfo
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- CN103034077A CN103034077A CN2012103525943A CN201210352594A CN103034077A CN 103034077 A CN103034077 A CN 103034077A CN 2012103525943 A CN2012103525943 A CN 2012103525943A CN 201210352594 A CN201210352594 A CN 201210352594A CN 103034077 A CN103034077 A CN 103034077A
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Abstract
The invention provides an electropositive single layer type electrophotographic photoconductor and an image forming device. The electropositive single layer type electrophotographic photoconductor in a photosensitive layer comprises a cavity conveying agent A and an electron conveying agent B, the ratio of A to B being 2.2 to 5.0.According to the invention, an electropositive single layer type electrophotographic photoconductor capable of suppressing white stripes on an image is provided.Furthermore, the image forming device employing such an electropositive single layer type electrophotographic photoconductor as an image carrier is capable of continuously providing good images.
Description
Technical field
The mass ratio A/B that the present invention relates between the quality B of the quality A of cavity conveying agent and electron transporting agent is 2.2～5.0 positively charged mono-layer electronic photographic photoreceptor and possesses above-mentioned positively charged mono-layer electronic photographic photoreceptor as the image processing system of image carrier.
Background technology
The Electrophtography photosensor that the image processing system of electrofax mode possesses has inorganic photoreceptor and Organophotoreceptor, inorganic photoreceptor possesses the photographic layer that is made of inorganic material such as selenium, amorphous silicons, and Organophotoreceptor possesses the photographic layer that mainly is made of organic materials such as resin glue, charge generating, charge transport agent.And, among these photoreceptors owing to compare Organophotoreceptor with inorganic photoreceptor and make easily, can from the material of relative broad range, select photographic layer material, design the degree of freedom height and be used widely.
At first, as Organophotoreceptor, the known single-layer type Organophotoreceptor that possesses the photographic layer that in same layer, comprises charge generating and charge transport agent.Known with compare with the laminated-type Organophotoreceptor of charge transport layer (containing the charge transport agent) at conductive base upper strata piezoelectricity lotus genetic horizon (containing charge generating), simple in structure and the easy manufacturing of above-mentioned single-layer type Organophotoreceptor can suppress the generation of paint film defect simultaneously.
In using the image processing system of this Electrophtography photosensor, during known charged mode when the employing positively charged, the oxidizing gas such as less generation ozone when charged.Therefore, the harmful effect that the release of considering oxidizing gas brings photoreceptor life-span and office environment, charged mode as the Electrophtography photosensor of image processing system, the charged modes that adopt positively charged more, in conjunction with the advantage of above-mentioned single-layer type, the positively charged mono-layer electronic photographic photoreceptor obtains utilizing just day by day.
On the other hand, for image processing system, consider from aspect that can simplified structure, studied and used so-called nothing except electric type image processing system, namely do not possess by coming except electric light and also proposed to use without the positively charged mono-layer electronic photographic photoreceptor that removes in the electric type image processing system to remove the device except electric section of electricity as the surface of the Electrophtography photosensor of image carrier.
Yet, remove in the electric type image processing system in described nothing, when the toner image that is formed at the image carrier surfaces such as photosensitive drums directly is transferred to mode on the printing medium as the transfer printing mode, if use the positively charged mono-layer electronic photographic photoreceptor, then there are the following problems: produce easily by the low part of image color bad with the image that is called as white stripes that striated produces in formed image.
In the image processing system of this direct transfer printing mode, Electrophtography photosensor (image carrier) and the transfer roll that is applied with transfer bias connect by the transfer belt that is used for transporting printing medium.And printing medium transports between the transfer roll that is applied with transfer bias and Electrophtography photosensor (image carrier) by transfer belt, thereby the toner image that is formed at the Electrophtography photosensor surface is transferred on the printing medium.
Yet, in the image processing system of direct transfer printing mode, as shown in Figure 1, transport printing medium on the transfer belt towards transfer roll, when transfer printing begins during the printing medium such as paper contact Electrophtography photosensor, have the very short time can produce the gap between transfer belt and Electrophtography photosensor, the influx of the electric current from the transfer roll to the photosensitive surface can descend in a flash.Therefore, in the image processing system of direct transfer printing mode, can form current potential than the noble potential part of high striated on every side on the Electrophtography photosensor surface after the transfer printing.
At this moment, if possess image processing system except electric section, then by by carry out except electric section except electrician's order, the noble potential part can be eliminated.
Yet without except in the electric type image processing system, noble potential part and on every side potential difference (PD) also can be maintained in the charged operation of subsequent technique, exposure process continue transfer printing process after, therefore can the generation white stripes in image.
Summary of the invention
The purpose of this invention is to provide a kind of positively charged mono-layer electronic photographic photoreceptor that can be suppressed at generation white stripes in the image processing system that does not possess the direct transfer printing mode of removing electric section.
In addition, the invention provides and possess above-mentioned positively charged mono-layer electronic photographic photoreceptor as the image processing system of image carrier.
The positively charged mono-layer electronic photographic photoreceptor that a scheme of the present invention relates to, on the rotation direction of image carrier, possesses at least successively electro-mechanical part, exposure section, development section, transfer section and do not possess and be used as image carrier in the image processing system except the direct transfer printing mode of electric section, it is characterized in that, described positively charged mono-layer electronic photographic photoreceptor is formed with at conductive base and comprises at least charge generating, the cavity conveying agent, the photographic layer of the single layer structure of electron transporting agent and resin glue, the mass ratio A/B between the quality A of the cavity conveying agent that comprises in the described photographic layer and the quality B of electron transporting agent is 2.2～5.0.
By using this positively charged mono-layer electronic photographic photoreceptor, can not possess for the generation that suppresses the image white striped by the image processing system that removes the electric direct transfer printing mode of removing electric section except electric light.
The image processing system that a scheme of the present invention relates to is characterised in that to possess:
Image carrier;
Electro-mechanical part is for the surface charging that makes described image carrier;
Exposure section is used for making the face exposure of charged described image carrier, thereby forms electrostatic latent image on the surface of described image carrier;
Development section, being used for described latent electrostatic image developing is toner image; With
Transfer section is used for transporting printing medium and described toner image directly being transferred to printing medium from described image carrier by transfer belt,
Described image processing system does not possess for by removing electric light the electric electric section that removes being removed on the surface of described image carrier, and described image carrier is above-mentioned positively charged mono-layer electronic photographic photoreceptor.
According to this technical scheme, discovery can obtain suppressing the image processing system of the generation of image white striped.
Further other purpose of the present invention, the concrete advantage that obtains according to the present invention can be clearer and more definite by the embodiment of following explanation.
Description of drawings
Fig. 1 is the figure of the image processing system of expression direct transfer printing mode of the present invention.
Fig. 2 is the figure of the structure of expression positively charged mono-layer electronic photographic photoreceptor of the present invention.
Fig. 3 is the structure diagram of an example of expression image processing system of the present invention.
Fig. 4 is the synoptic diagram of the surface potential detection of expression positively charged mono-layer electronic photographic photoreceptor of the present invention.
Embodiment
Below, embodiments of the present invention are described, but the invention is not restricted to these embodiments.
[the first embodiment]
The first embodiment relates in the rotation direction towards image carrier and possesses at least successively electro-mechanical part, exposure section, development section and transfer section and do not possess in the image processing system except the direct transfer printing mode of electric section, as the positively charged mono-layer electronic photographic photoreceptor of image carrier.
Specifically, the positively charged mono-layer electronic photographic photoreceptor of the first embodiment relates to the photographic layer that is formed with the single layer structure that comprises at least charge generating, cavity conveying agent, electron transporting agent and resin glue at conductive base, and the mass ratio A/B between the quality B of the quality A of the cavity conveying agent in the photographic layer and electron transporting agent is 2.2～5.0 positively charged mono-layer electronic photographic photoreceptor.
As shown in Figure 2, the positively charged mono-layer electronic photographic photoreceptor 10 of the first embodiment possesses conductive base 12 and the photographic layer 14 of the individual layer that contains charge generating, cavity conveying agent, electron transporting agent and resin glue that forms at conductive base 12.And, if positively charged mono-layer electronic photographic photoreceptor 10 possesses conductive base 12 and photographic layer 14, then without particular limitation of.Specifically, for example shown in Fig. 2 (a), can directly possess photographic layer 14 on conductive base 12, positively charged mono-layer electronic photographic photoreceptor 10 ' that also can be shown in Fig. 2 (b) possesses middle layer 16 like that between conductive base 12 and photographic layer 14.In addition, shown in Fig. 2 (a) or Fig. 2 (b), photographic layer 14 can become outermost layer and expose, positively charged mono-layer electronic photographic photoreceptor 10 that also can be shown in Fig. 2 (c) " like that, possess protective seam 18 at photographic layer 14.
Below, for the positively charged mono-layer electronic photographic photoreceptor, successively conductive base and photographic layer are described.
[conductive base]
For conductive base, if can be used as the conductive base of positively charged mono-layer electronic photographic photoreceptor, then without particular limitation of.Specifically, can enumerate the conductive base etc. that consists of at least surface element with the material with electric conductivity.That is, the conductive base that the material with electric conductivity of specifically for example can serving as reasons forms, or the conductive base that forms with the surface of the material plastic covering material with electric conductivity etc.In addition, the material that has electric conductivity can be enumerated such as aluminium, iron, copper, tin, platinum, silver, vanadium, molybdenum, chromium, cadmium, titanium, nickel, palladium, indium, stainless steel, brass etc.In addition, as the material with electric conductivity, can use a kind of material with electric conductivity, also two or more combinations of materials with electric conductivity can be used, such as using in modes such as alloys.In addition, as conductive base, in above-mentioned giving an example, preferably formed by aluminum or aluminum alloy.Thus, can provide the positively charged mono-layer electronic photographic photoreceptor that can form better image.Think that this is because due to the migration of electric charge from photographic layer to conductive base well.
The shape of conductive base can suitably be selected according to the structure of the image processing system of usefulness, such as the matrix that can preferably use sheet, drum type etc.In addition, the thickness of conductive base can suitably be selected according to above-mentioned shape.
[photographic layer]
The photographic layer that possesses as the positively charged mono-layer electronic photographic photoreceptor, if the photographic layer of the single layer structure that is consisted of by charge generating, cavity conveying agent, electron transporting agent and resin glue at least, and the mass ratio A/B between the quality A of the cavity conveying agent in the photographic layer and the quality B of electron transporting agent is 2.2～5.0, then without particular limitation of.
(charge generating)
If charge generating can be used as the charge generating of positively charged mono-layer electronic photographic photoreceptor use then without particular limitation of.Specifically, can enumerate for example X-type metal-free phthalocyanine (X-H of following formula (I) expression
2Pc), Y-shaped oxygen titanium phthalocyanines (Y-TiOPc), perylene pigment, disazo pigment, dithione pyrrolopyrrole (dithioketo-pyrrolopyrrole) pigment, without metal naphthalene phthalocyanine pigment, metal naphthalene phthalocyanine pigment, side's acid color, trisazo pigment, indigo pigment, azulenes pigment (azulenium pigment), phthalocyanine pigments, selenium, selenium-tellurium, selenium-arsenic, cadmium sulfide, the powder of the inorganic light conductive material such as amorphous silicon, pyralium salt, anthanthrene quinones pigment, triphenylmethane pigment, intellectual circle's class pigment, toluene amine pigment, pyrazolines pigment and quinacridine ketone pigment etc.
Formula (I)
In addition, charge generating can be separately with or make up two or more the use, in desired zone, to have absorbing wavelength.Further, particularly for the image processing system of the digit optical systems such as the laser beam printer that uses the light source such as semiconductor laser or facsimile recorder, the positively charged mono-layer electronic photographic photoreceptor that need to the wavelength region may more than 700nm has light sensitivity is so preferably in above-mentioned each charge generating use phthalocyanine pigments such as metal-free phthalocyanine, titanyl phthalocyanine.And, to the crystal formation of above-mentioned phthalocyanine pigment without particular limitation of, can use the phthalocyanine pigment of various crystal formations.In addition, image processing system for the simulated optical systems such as electrostatic duplicating machine that use the white light sources such as halide lamp, the positively charged mono-layer electronic photographic photoreceptor that need to have in visibility region light sensitivity, therefore such as perylene pigment, disazo pigment etc. of preferred use.
(cavity conveying agent)
The cavity conveying agent of using among the present invention can suitably be selected to use from the cavity conveying agent of all the time using the positively charged mono-layer electronic photographic photoreceptor.As the cavity conveying agent of in the photographic layer of positively charged mono-layer electronic photographic photoreceptor, using all the time, for example can enumerate benzidine derivative,
Diazoles compound, styrene compound, carbazole compound, organopolysilane compound, pyrazoline compounds, hydrazone compounds, triphenylamine compound, Benzazole compounds,
Azole compounds, different
The nitrogenous ring type compounds such as azole compounds, thiazole compound, thiadiazole compound, glyoxaline compound, pyrazole compound, triazole class compounds, fused-polycyclic compounds etc.As among these compounds of cavity conveying agent, more preferably styrene compound, triphenylamine compound, hydrazone compounds.
The drift mobility that the cavity conveying agent of using among the present invention is measured by the following method is preferably 1.0 * 10
-6Cm
2More than/the Vsec, more preferably 5.0 * 10
-6Cm
2More than/the Vsec.The drift mobility of cavity conveying agent can be measured as follows.
＜drift mobility assay method 〉
The bisphenol z-polycarbonate resin of viscosity average molecular weigh 50,000 and the cavity conveying agent that with respect to the sample gross mass is 30 quality % are joined in the organic solvent, make polycarbonate resin and cavity conveying agent dissolve to prepare coating fluid.The coating fluid that obtains is applied on the base material that is made of aluminium, carries out thermal treatment in 30 minutes at 80 ℃, desolventizing, thus form filming of the about 7 μ m of thickness.Then, form translucent gold electrode as measuring sample in this employing vacuum vapour deposition of filming.The sample that use obtains is in 23 ℃ of temperature, electric field intensity 3.0 * 10
5Under the condition of V/cm, determine drift mobility according to flight time (TOF, Time ofFlight) method.
The viscosity average molecular weigh M of polycarbonate resin can obtain limiting viscosity η by Ostwald viscosimeter, and according to Shi Naier (Schnell) formula, by η 1.23 * 10
-4M
0.83Calculate.In addition, η can use under 20 ℃ and make concentration as 6.0g/dm with methylene chloride as the dissolution with solvents polycarbonate resin
3And the polycarbonate resin solution that obtains is measured.
(electron transporting agent)
If electron transporting agent can as the electron transporting agent that contains in the photographic layer of positively charged mono-layer electronic photographic photoreceptor then without particular limitation of.Specifically, can enumerate quinone derivatives such as naphthoquinone derivatives, diphenoquinone, anthraquinone derivative, azo quinone (azoquinone) derivant, nitroanthraquinone derivant, dinitroanthraquinone derivant, malononitrile derivant, the thiapyran derivant, the trinitro-thioxanthone derivates, 3,4,5,7-tetranitro-9-Fluorenone derivant, dinitro anthracene derivant, dinitro acridine derivatives, tetracyanoethylene, 2,4,8-trinitro-thioxanthones, dinitro benzene, the dinitro anthracene, dinitro acridine, succinic anhydride, maleic anhydride, dibromomaleic acid acid anhydride etc.Among them, quinone derivative more preferably.
In addition, electron transporting agent can be used separately, also two or more use capable of being combined.
The drift mobility that the electron transporting agent of using among the present invention is measured by the following method is preferably 2.0 * 10
-8Cm
2More than/the Vsec, more preferably 1.2 * 10
-7Cm
2More than/the Vsec.The drift mobility of electron transporting agent can be according to the method mensuration same with the cavity conveying agent.
(resin glue)
If resin glue can as the resin glue that contains in the photographic layer of positively charged mono-layer electronic photographic photoreceptor then without particular limitation of.Concrete example as the resin that is preferably used as resin glue, can enumerate polycarbonate resin, styrene resin, Styrene-Butadiene, styrene-acrylonitrile copolymer, styrene-maleic acid copolymer, the styrene-propene acid copolymer, acrylic copolymer, polyvinyl resin, vinyl-vinyl acetate copolymer, chlorinated polyethylene resin, Corvic, acrylic resin, ionomer, vinyl chloride vinyl acetate copolymer, alkyd resin, polyamide, urethane resin, polyarylate resin, polysulfone resin, diallyl phthalate resin, ketone resin, polyvinyl butyral resin, polyether resin, the thermoplastic resins such as vibrin, organic siliconresin, epoxy resin, phenolics, carbamide resin, melamine resin, the thermoset resins such as other bridging property thermoset resins, Epocryl, the light-cured resins such as polyurethane acrylic emulsion copolymerization resin.These resins can use separately, also two or more use capable of being combined.
Among these resins, from the viewpoint of the photographic layer of the balance excellence that obtains processability, mechanical characteristic, optical characteristics, mar proof, the more preferably polycarbonate resins such as bisphenol z-polycarbonate resin, bisphenol Z C type polycarbonate resin, bisphenol-c type polycarbonate resin and bisphenol A polycarbonate resin.
(adjuvant)
Not bringing the electrofax characteristic in the dysgenic scope, except charge generating, cavity conveying agent, electron transporting agent and resin glue, also can comprise various adjuvants in the photographic layer of positively charged mono-layer electronic photographic photoreceptor.The adjuvant that can be coupled in the photographic layer can be enumerated anti-deterioration agent, softening agent, plastifier, surface modifier, extender, thickening agent, dispersion stabilizer, wax, acceptor, donor, surfactant and levelling agents etc. such as antioxidant, radical scavenger, singlet quencher (singlet quencher), ultraviolet light absorber.
(manufacture method of positively charged mono-layer electronic photographic photoreceptor)
If the manufacture method of positively charged mono-layer electronic photographic photoreceptor in the scope that does not hinder the object of the invention, then without particular limitation of.The preference of the manufacture method of positively charged mono-layer electronic photographic photoreceptor can be enumerated the method for the coating fluid formation photographic layer that photosensitive coated layer is used on conductive base.Specifically, with the dissolving such as charge generating, cavity conveying agent, electron transporting agent, resin glue and the various adjuvants that add as required or be dispersed in the coating fluid that forms in the solvent and be coated on the conductive base, carry out drying, can make photographic layer thus.To coating process without particular limitation of, can enumerate such as use the rotary coating machine, apply the machine of smearing, the method for flush coater, coiling rod coating machine, dip coater, scraper etc.In addition, the drying means of filming that is formed on the conductive base can be enumerated such as method of carrying out heated-air drying under 80～150 ℃, 15～120 minutes condition etc.
In the positively charged mono-layer electronic photographic photoreceptor, cavity conveying agent and electron transporting agent are that 2.2～5.0 mode is used according to the mass ratio A/B between the quality B of the quality A of the described cavity conveying agent in the photographic layer and described electron transporting agent.Specifically, the content of cavity conveying agent is preferably 5～500 mass parts with respect to resin glue 100 mass parts, more preferably 25～200 mass parts.Electron transporting agent is that the mode of aforementioned proportion is used according to the use amount with respect to the cavity conveying agent.
If the content of the charge generating in the photographic layer in the scope that does not hinder the object of the invention, then without particular limitation of.The content of charge generating is preferably 0.1～50 mass parts with respect to resin glue 100 mass parts, more preferably 0.5～30 mass parts.In addition, the use amount of charge generating is preferably below the 12 quality %, more preferably 7～12 quality % with respect to the use amount of electron transporting agent.With respect to the use amount of electron transporting agent, when using charge generating with aforementioned proportion, the surface potential of photoreceptor also is difficult for rising in the situation that forms multiimage, forms for a long time easily good image.
Further, the total amount of cavity conveying agent and electron transporting agent, be the content of charge transport agent with respect to resin glue 100 mass parts, be preferably 20～500 mass parts, more preferably 30～200 mass parts.
The photographic layer thickness of positively charged mono-layer electronic photographic photoreceptor, as long as can fully play the effect of photographic layer, then without particular limitation of.Specifically, for example be preferably 5～100 μ m, more preferably 10～50 μ m.
As long as the contained solvent of the coating fluid that photographic layer is used is solubilized or disperse to consist of each composition of photographic layer, then without particular limitation of.Specifically, can enumerate the alcohols such as methyl alcohol, ethanol, isopropyl alcohol, butanols; The aliphatic hydrocarbons such as normal hexane, octane, cyclohexane; The aromatic hydrocarbons such as benzene,toluene,xylene; The halogenated hydrocarbons such as methylene chloride, ethylene dichloride, phenixin, chlorobenzene; The ethers such as dimethyl ether, diethyl ether, tetrahydrofuran, glycol dimethyl ether, diethylene glycol dimethyl ether; The ketones such as acetone, MEK, methylisobutylketone, cyclohexanone; The ester such as ethyl acetate, methyl acetate class; The non-proton property polar organic solvents such as dimethylformaldehyde, dimethyl formamide, dimethyl sulfoxide.These solvents can use separately, also two or more use capable of being combined.
The positively charged mono-layer electronic photographic photoreceptor of the first embodiment described above, towards the rotation direction of image carrier according to this order possess at least electro-mechanical part, exposure section, development section and transfer section and do not possess in the image processing system except the direct transfer printing mode of electric section and be used as image carrier.In image processing system in the past, in formation image, produce white stripes easily, but be used as image carrier by the positively charged mono-layer electronic photographic photoreceptor with the first embodiment, thereby can suppress the generation of the white stripes in the image that forms.
[the second embodiment]
The second embodiment relates to image processing system, possesses: image carrier; Electro-mechanical part is for the surface charging that makes image carrier; Exposure section is used for making the face exposure of charged image carrier, thereby forms electrostatic latent image on the surface of image carrier; Development section, being used for latent electrostatic image developing is toner image; And transfer section, be used for transporting printing medium and toner image being transferred to printing medium from image carrier by transfer belt, described image processing system does not possess for electric except electric section by except electric light the image carrier surface being removed, and described image processing system uses the band in the first embodiment just being with mono-layer electronic photographic photoreceptor as image carrier.
In addition, image processing system of the present invention forms any of device, color image forming device applicable to monochrome image, but preferably uses the color image forming device of the series system of multiple color toner at this.
And, in order on each surface, to form toner image by the toner of different colours respectively, below the band that possesses of explanation just possesses a plurality of image carriers and a plurality of development section with the image processing system of mono-layer electronic photographic photoreceptor, these a plurality of image carriers are on prescribed direction and establish, these a plurality of development sections have and each image carrier subtend configuration, carry from the teeth outwards and transport toner, the toner that transports is supplied with respectively developer roll to each image carrier surface, and each image carrier uses respectively the band in the first embodiment just being with mono-layer electronic photographic photoreceptor.
Fig. 3 possesses band just with the synoptic diagram of the color image forming device structure of the series system of mono-layer electronic photographic photoreceptor for expression.At this, as image processing system, describe as an example of color printer 1 example.
As shown in Figure 3, this color printer 1 has the equipment body 1a of box, in this equipment body 1a, be provided with the sheet feed section 2 of supplying with paper using P, transport the paper using P that supplied with by this sheet feed section 2 and will based on the toner image transfer printing of view data etc. on this paper using P image forming part 3 and implement to utilize these image forming part 3 transfer printings to be fixed on the photographic fixing section 4 that the photographic fixing on the paper using P is processed in the unfixed toner image on the paper using P.Further, being provided with output on equipment body 1a utilizes photographic fixing section 4 to implement the paper delivery section 5 of the paper using P of photographic fixing processing.
In addition, sheet feed section 2 further comprise the left surface that is installed in equipment body 1a shown in Figure 3 not shown manual pallet, get paper bowl and paper feed roller.This is got paper bowl and takes out the paper using P that is positioned on the manual pallet.Utilization is got paper using P that paper bowl takes out and is passed out to by paper feed roller and use paper-delivering path, supplies to image forming part 3 by resistance roller 125 with the timing of stipulating.
Image formation unit 7 comprises black unit 7K, the yellow unit 7Y of using, cyan unit 7C and the magenta unit 7M that sets successively towards the downstream from upstream side (being the left side among Fig. 3).Each unit 7K, 7Y, 7C and 7M middle position separately dispose can along arrow (counterclockwise) direction rotate as the positively charged mono-layer electronic photographic photoreceptor 37(of image carrier hereinafter referred to as photoreceptor 37).And, around each photoreceptor 37, from the rotation direction upstream side, dispose respectively successively electro-mechanical part 39, exposure section 38, development section 71 and cleaning section (not shown).And, as photoreceptor 37, use the positively charged mono-layer electronic photographic photoreceptor in the first embodiment.In addition, remove electric structure because the image processing system of the second embodiment is nothing, thereby color printer 1 not disposing except electric section around photoreceptor 37.
Electro-mechanical part 39 makes along the side face of the photoreceptor 37 of direction of arrow rotation charged equably.As long as electro-mechanical part 39 can make the side face of photoreceptor 37 charged equably, then not especially restriction can be cordless, also can be the way of contact.As the concrete example of electro-mechanical part, can enumerate corona charging device, charged roller, band brush etc., more preferably charged roller, with the Charging system of the ways of contact such as brush.By using the electro-mechanical part 39 of the way of contact, ozone and the oxides of nitrogen isoreactivity gas purging that can suppress generation from electro-mechanical part 39, prevent the deteriorated of the Electrophtography photosensor photographic layer that caused by active gases, can make the design of considering office environment etc. simultaneously.
When electro-mechanical part 39 possesses the charged roller of the way of contact, if charged roller can with state that photoreceptor 37 contacts under make the side face (surface) of photoreceptor 37 charged, then without particular limitation of.As charged roller, for example can enumerate with state that photoreceptor 37 contacts under, be subordinated to the rotation of photoreceptor 37 and the charged roller of rotating etc.In addition, as charged roller, can enumerate roller that is consisted of by resin such as surface element at least etc.More particularly, can enumerate such as possessing the cored bar that supported by axle rotationally, being formed on the resin bed on the cored bar and cored bar being executed charged roller of alive voltage application portion etc.Possess the electro-mechanical part of this charged roller by by voltage application portion cored bar being applied voltage, can make the surface charging by the photoreceptor 37 of resin bed contact.
In addition, consist of the resin of the resin bed of charged roller, if can make the side face of photoreceptor 37 charged well, then without particular limitation of.The concrete example of the resin that uses in the resin bed can be enumerated organic siliconresin, urethane resin, silicon modified resin etc.In addition, can contain inorganic filling material in the resin bed.
To the especially restriction of voltage that charged roller is applied by voltage application portion, but comparing when applying alternating voltage or alternating voltage with the overlapping overlapping voltage that forms of DC voltage, preferably only is DC voltage.When charged roller is only applied DC voltage, have the trend of the wear extent minimizing of photographic layer, can form suitable image.By charged roller the DC voltage that Electrophtography photosensor applies is preferably 1000～2000V, more preferably 1200～1800V is particularly preferably 1400～1600V.
And, utilize transfer roll 36 to be transferred to the transferred image of paper using P by image forming part 3, processed by the photographic fixing that this paper using P utilizes heating to carry out by time between warm-up mill 41 and the backer roll 42, arrived paper using P by photographic fixing.And the paper using P that has implemented the photographic fixing processing is output to paper delivery section 5.In addition, in the color printer 1 of present embodiment, the suitable position between photographic fixing section 4 and paper delivery section 5 is equipped with and transports roller 6.
The top depression of the equipment body 1a of paper delivery section 5 by making color printer 1 forms, and is formed with the paper delivery pallet 51 of the paper using P that reception exports in the bottom of the recess of this depression.
Form operation by above-mentioned image, color printer 1 forms image at paper using P.And, the image processing system of above-mentioned series system is owing to possess positively charged mono-layer electronic photographic photoreceptor in the first embodiment as image carrier, although therefore be without the apparatus structure except the so easy generation white stripes of electric and direct transfer printing mode, can suppress the generation of the white stripes in the image that forms.
[embodiment]
By the following examples the present invention is carried out more specific description.And the present invention is not implemented example and limits.
In embodiment and comparative example, use the represented HTM-A of following formula or HTM-B as the cavity conveying agent, use the represented ETM-a of following formula or ETM-b as electron transporting agent.And the bottom-right numerical value of structural formula is drift mobility (unit: cm
2/ Vsec).
[cavity conveying agent]
[embodiment 1]
With metal-free phthalocyanine 2 mass parts, cavity conveying agent (HTM-A) 50 mass parts, electron transporting agent (ETM-a) 10 mass parts, viscosity average molecular weigh 50,000 bisphenol z-polycarbonate resin 100 mass parts and tetrahydrofuran 800 mass parts join in the bowl mill, carry out 50 hours mixing, dispersion treatment, prepare the coating fluid that photographic layer is used.With dip coating the coating fluid that obtains is coated on the conductive substrate, and 100 ℃ of lower processing 40 minutes, from film, removes tetrahydrofuran, thereby obtain possessing the positively charged mono-layer electronic photographic photoreceptor of the photographic layer of 30 μ m thickness.
The positively charged mono-layer electronic photographic photoreceptor that use obtains in embodiment 1 has carried out the evaluation of white stripes and the mensuration of the photosensitive surface current potential after printing continuously by the following method.The evaluation result of the positively charged mono-layer electronic photographic photoreceptor of embodiment 1 is recorded in table 1.
＜white stripes evaluation 〉
By visualization use without except electricity and for direct transfer printing mode, possess wire electrode (ス コ ロ ト ロ Application) charged device with grid as the image processing system of the electro-mechanical part image with gradation of drop-out colour about 0.8 formed A4 size, according to following standard the degree of white stripes is judged.
Permissible judgement is the LV(grade in the criterion shown below in practical) 1.
(criterion)
The LV(grade) 1: in formation image, do not observe white stripes.
The LV(grade) 2: in formation image, observe extremely light white stripes.
The LV(grade) 3: in formation image, observe light white stripes.
The LV(grade) 4: in formation image, observe clearly white stripes.
The surface potential of＜photoreceptor 〉
Use bulging testing machine shown in Figure 4 that the surface potential of positively charged mono-layer electronic photographic photoreceptor is measured.The drum testing machine possess in opposed position to photoreceptor 101 apply the charged device 102(of positive voltage with the charged device of gate electrode silk) and apply transfer belt electrical equipment 105(monopolar electrode silk (the コ ロ ト ロ Application) charged device of negative voltage to photoreceptor).In addition, rouse testing machine and be adjacent to possess successively the light source 103 that makes photoreceptor 101 exposures and the potential measurement probe 104 that the surface potential of photoreceptor 101 is measured along downstream direction and charged device 102 with respect to photoreceptor 101 rotation directions.
The positively charged mono-layer electronic photographic photoreceptor of embodiment 1 is installed in this drum testing machine, photoreceptor 101 is rotated along prescribed direction (being clockwise among Fig. 4), in 30 minutes, repeat the test that loops of charged → exposure → transfer printing, determine from the surface potential of initial photoreceptor and deduct the surface potential of the photoreceptor after the described 30 minutes revision test and the changes delta V of the surface potential that obtains
0(V).And in the drum testing machine, the voltage that applies of charged operation is 800V, and the exposure of exposure process is 1.0 μ Jcm
2, the voltage that applies of transfer printing process is-1.2kV that the peripheral speed of photoreceptor is 100mm/ second.
Evaluation result is recorded in table 1.With Δ V
0Absolute value be judged to be zero during less than 20V, be judged to be △ when 20V is above.
[embodiment 2～13 and comparative example 1～8]
In addition kind and amount with kind and the addition of cavity conveying agent and electron transporting agent are changed into table 1 record obtain the positively charged mono-layer electronic photographic photoreceptor similarly to Example 1.The photoreceptor that use obtains has carried out the mensuration of white stripes evaluation and the photosensitive surface current potential after printing continuously similarly to Example 1.The evaluation result of the positively charged mono-layer electronic photographic photoreceptor of embodiment 2～13 and comparative example 1～8 is recorded in table 1.
[table 1]
According to table 1 as can be known, drift mobility is 1.0 * 10 in photographic layer when using
-6Cm
2Quality A and the drift mobility of the cavity conveying agent that/Vsec is above are 2.0 * 10
-8Cm
2Mass ratio A/B between the quality B of the electron transporting agent that/Vsec is above is the positively charged mono-layer electronic photographic photoreceptor of 2.2～5.0 embodiment 1～13, when forming image by nothing except electricity and for the image processing system of direct transfer printing mode, the evaluation of white stripes is LV1, and the generation of white stripes is suppressed well.
On the other hand as can be known, be 1.0 * 10 when using in drift mobility described in the photographic layer
-6Cm
2Quality A and the described drift mobility of the cavity conveying agent that/Vsec is above are 2.0 * 10
-8Cm
2Mass ratio A/B between the quality B of the electron transporting agent that/Vsec is above departs from the positively charged mono-layer electronic photographic photoreceptor of the comparative example 1～8 of 2.2～5.0 scope, when forming image by nothing except electricity and for the image processing system of direct transfer printing mode, white stripes be evaluated as LV2～LV4, can't suppress the generation of white stripes.
In addition, according to for example embodiment 1 and 2 and embodiment 3 and 4 between more as can be known, if the quality C of the charge generating in the photographic layer is below the 12 quality % with respect to the mass ratio C/B of the quality B of electron transporting agent, even then repeat the circulation of charged, transfer printing and exposure, also can obtain the not labile better positively charged mono-layer electronic photographic photoreceptor of surface potential after charged.
[embodiment 14～17, comparative example 9～13]
[table 2]
According to table 2 as can be known, if the mass ratio A/B in the photographic layer between the quality B of the quality A of hole agent delivery and described electron transporting agent is the positively charged mono-layer electronic photographic photoreceptor of 2.2～5.0 embodiment 14～17, even then possess the image processing system of the electro-mechanical part of contact electrification mode, the generation of white stripes is also suppressed well.
On the other hand as can be known, adopt the mass ratio A/B of hole agent delivery and described electron transporting agent in the photographic layer to depart from the positively charged mono-layer electronic photographic photoreceptor of 2.2～5.0 comparative example 9～13, even possess the image processing system of the electro-mechanical part of contact electrification mode, also can't suppress the generation of white stripes.
Claims (6)
1. positively charged mono-layer electronic photographic photoreceptor, on the rotation direction of image carrier, possesses successively electro-mechanical part, exposure section, development section and transfer section and do not possess and be used as described image carrier in the image processing system except the direct transfer printing mode of electric section, it is characterized in that, described positively charged mono-layer electronic photographic photoreceptor is formed with at conductive base and comprises at least charge generating, the cavity conveying agent, the photographic layer of the single layer structure of electron transporting agent and resin glue, the mass ratio A/B between the quality A of the described cavity conveying agent that comprises in the described photographic layer and the quality B of described electron transporting agent is 2.2～5.0.
2. positively charged mono-layer electronic photographic photoreceptor according to claim 1 is characterized in that, the drift mobility of described cavity conveying agent is 1.0 * 10
-6Cm
2More than/the Vsec, described drift mobility is that the film of poly carbonate resin composition of the thick 5 μ m that will form at the aluminum base material is as sample, in 23 ℃ of temperature, electric field intensity 3.0 * 10
5Measure the value that draws under the condition of V/cm, described poly carbonate resin composition is made of the bisphenol z-polycarbonate resin 70 quality % of described cavity conveying agent 30 quality % and viscosity average molecular weigh 50,000.
3. positively charged mono-layer electronic photographic photoreceptor according to claim 1 is characterized in that, the drift mobility of described electron transporting agent is 2.0 * 10
-8Cm
2More than/the Vsec, described drift mobility is that the film of poly carbonate resin composition of the thick 5 μ m that will form at the aluminum base material is as sample, in 23 ℃ of temperature, electric field intensity 3.0 * 10
5Measure the value that draws under the condition of V/cm, described poly carbonate resin composition is made of the bisphenol z-polycarbonate resin 70 quality % of described electron transporting agent 30 quality % and viscosity average molecular weigh 50,000.
4. the described positively charged mono-layer electronic photographic photoreceptor of any one in 3 according to claim 1, it is characterized in that the quality C of the described charge generating in the described photographic layer is below the 12 quality % with respect to the mass ratio C/B of the quality B of described electron transporting agent.
5. image processing system is characterized in that possessing:
Image carrier;
Electro-mechanical part is for the surface charging that makes described image carrier;
Exposure section is used for making the face exposure of charged described image carrier, thereby forms electrostatic latent image on the surface of described image carrier;
Development section, being used for described latent electrostatic image developing is toner image; With
Transfer section is used for transporting printing medium and described toner image directly being transferred to described printing medium from described image carrier by transfer belt,
Described image processing system does not possess for by except electric light the electric section that removes of electricity remove on the surface of described image carrier,
Described image carrier is the described positively charged mono-layer electronic photographic photoreceptor of any one in the claim 1 to 4.
6. image processing system according to claim 5 is characterized in that,
Described electro-mechanical part is the contact electrification mode.
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| Application Number | Priority Date | Filing Date | Title |
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| JP2011-218462 | 2011-09-30 | ||
| JP2011218462A JP5885446B2 (en) | 2011-09-30 | 2011-09-30 | Positively charged single layer type electrophotographic photosensitive member and image forming apparatus |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108139698A (en) * | 2015-10-07 | 2018-06-08 | 京瓷办公信息系统株式会社 | Electrophtography photosensor, handle box and image forming apparatus |
| CN109074010A (en) * | 2016-05-23 | 2018-12-21 | 京瓷办公信息系统株式会社 | Electrophtography photosensor, handle box and image forming apparatus |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| JP6390482B2 (en) * | 2015-03-24 | 2018-09-19 | 京セラドキュメントソリューションズ株式会社 | Positively charged single layer type electrophotographic photosensitive member, process cartridge, and image forming apparatus |
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| EP1189113A2 (en) * | 2000-09-18 | 2002-03-20 | Kyocera Mita Corporation | Electrophotosensitive material |
| JP2002169306A (en) * | 2000-11-30 | 2002-06-14 | Kyocera Mita Corp | Monolayer electrophotographic photoreceptor |
| US20040049027A1 (en) * | 2002-08-28 | 2004-03-11 | Kazunari Hamasaki | Titanyl phthalocyanine crystal and production method of the same, and electrophotosensitive material |
| JP2005055870A (en) * | 2003-07-18 | 2005-03-03 | Kyocera Mita Corp | Electrophotographic photoreceptor and image forming apparatus |
| JP2006091488A (en) * | 2004-09-24 | 2006-04-06 | Kyocera Mita Corp | Image forming apparatus |
| US20060141377A1 (en) * | 2004-12-24 | 2006-06-29 | Kyocera Mita Corporation | Electrophotographic photoreceptor and image forming apparatus |
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| JP2010175784A (en) * | 2009-01-29 | 2010-08-12 | Kyocera Mita Corp | Single-layer electrophotographic photoreceptor, image forming apparatus, and image formation method |
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|---|---|---|---|---|
| EP1189113A2 (en) * | 2000-09-18 | 2002-03-20 | Kyocera Mita Corporation | Electrophotosensitive material |
| JP2002169306A (en) * | 2000-11-30 | 2002-06-14 | Kyocera Mita Corp | Monolayer electrophotographic photoreceptor |
| US20040049027A1 (en) * | 2002-08-28 | 2004-03-11 | Kazunari Hamasaki | Titanyl phthalocyanine crystal and production method of the same, and electrophotosensitive material |
| JP2005055870A (en) * | 2003-07-18 | 2005-03-03 | Kyocera Mita Corp | Electrophotographic photoreceptor and image forming apparatus |
| JP2006091488A (en) * | 2004-09-24 | 2006-04-06 | Kyocera Mita Corp | Image forming apparatus |
| US20060141377A1 (en) * | 2004-12-24 | 2006-06-29 | Kyocera Mita Corporation | Electrophotographic photoreceptor and image forming apparatus |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108139698A (en) * | 2015-10-07 | 2018-06-08 | 京瓷办公信息系统株式会社 | Electrophtography photosensor, handle box and image forming apparatus |
| CN108139698B (en) * | 2015-10-07 | 2021-04-27 | 京瓷办公信息系统株式会社 | Electrophotographic photoreceptor, process cartridge, and image forming apparatus |
| CN109074010A (en) * | 2016-05-23 | 2018-12-21 | 京瓷办公信息系统株式会社 | Electrophtography photosensor, handle box and image forming apparatus |
| CN109074010B (en) * | 2016-05-23 | 2022-03-25 | 京瓷办公信息系统株式会社 | Electrophotographic photoreceptor, process cartridge, and image forming apparatus |
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| JP5885446B2 (en) | 2016-03-15 |
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