CN1655066A - Electrophotographic sensitive body, electrophotographic device and processing case - Google Patents

Abstract

Disclosed is an electronic photographic photoreceptor which comprises a conductive backing material, a base coat covered on the conductive backing material and a photosensitive layer covered on the base coat, wherein the photosensitive layer has a charge generation layer covered on the base coat and a charge transport layer covered on the charge generation layer.Besides, after the base coat and the charge generation layer covered on the conductive backing material are formed, the reflectance ratio of the charge generation layer is 15-21 5.675405e-307n light being in the range of 360-740 nm and exhibiting maximal reflectance ratio to the charge generation layer is adopted to irradiate the charge generation layer.

Description

Electrophtography photosensor and manufacture method, electro-photography apparatus and handle box

Technical field

The present invention relates to the method for a kind of Electrophtography photosensor (electrophotographic photoreceptor) and this photoreceptor of manufacturing, and the electro-photography apparatus and the handle box (process cartridge) that use Electrophtography photosensor.More particularly, the present invention relates to a kind of electro-photography apparatus that is used for as the Electrophtography photosensor of duplicating machine, facsimile recorder, laser printer and Direct Digital platemaking machine, with the method for making this photoreceptor, and the electro-photography apparatus and the handle box that use Electrophtography photosensor.

Background technology

Be used for electro-photography apparatus as: the photochromics of the photoreceptor of duplicating machine and laser printer by inorganic photochromics as: selenium, zinc paste and cadmium sulfide change the organic photosensitive material into.This is that production cost is low because the organic photosensitive material is environmentally friendly; And design flexibility is good.

Organophotoreceptor can roughly be divided into following three types:

(1) uniform individual layer photoreceptor, wherein for example: conductive base (conductive substrate) go up form photoconductive resin as: polyvinylcarbazole (PVK) or charge transfer complex are as PVK-TNF (2,4, the 7-trinitro-fluorenone);

(2) decentralized individual layer photoreceptor wherein forms resin bed on conductive base, it comprises the pigment that is dispersed in the resin such as phthalocyanine with perylene.

(3) function multilayer photoreceptor independently, wherein overlapping on conductive base (overlay) comprises the charge generation layer (being designated hereinafter simply as CGL) of charge generating material (being designated hereinafter simply as CGM) and comprises the charge transport layer (being designated hereinafter simply as CTL) of charge transport materials (being designated hereinafter simply as CTM).

The function independently typical structure of multilayer photoreceptor is that CTL is formed on the CGL.Sometimes weighing-appliance have inverse structure, function independently the multilayer photoreceptor be opposite layer (reverse-layered) photoreceptor.

Especially, function independently the multilayer photoreceptor have photonasty and have the good advantage of adaptability in the photoreceptor of high photosensitivity and excellent durability in design.Therefore, recently, function independently multilayer photoreceptor has been widely used in electro-photography apparatus.

In recent years, more and more need can high-speed production qualitative picture (image) the miniature electric photographic means.In addition, (just: be not more than 6 μ m) polymerization toner is used for developing to tend to select sphere and minor diameter now.

For with required high-speed production qualitative picture, electro-photography apparatus forms highdensity image.This has just caused the image deterioration problem, and this problem is called " afterimage " or " ghost image " in many cases.Therefore in fact do not have required can be with the perfect electro-photography apparatus of high-speed production qualitative picture.

The afterimage phenomenon is described now.

When formation has image section and the picture black image partly that specific light is only arranged, when forming shadow tone (half-tone) image as shown in FIG. 9 then, sometimes in half tone image, can observe the afterimage (plus or minus picture) of image.These images are called " positive afterimage " or " positive echo image " (as shown in figure 10) and " negative afterimage " or " negative ghost image image " (as shown in figure 11).Particularly must prevent from the color electronic camera of high-quality, to form this afterimage.

The mechanism of formation afterimage is thought what the fluctuation by the photosensitive surface electromotive force described in open Japanese patent application No. (the to call JOP in the following text) 11-133825 that examines caused.Explain the fluctuation of photosensitive surface electromotive force in each process of sub-image formation, development and transfer printing with reference to Figure 12.

Figure 12 A shows when photoreceptor charges to equably to have-electromotive force of 700V, when exposing with imaging then, and the surface potential of photoreceptor (that is the surface potential of the electrostatic latent image that, on photoreceptor, forms).In this case, the surface potential of exposed portion approximately is 0V.Figure 12 B illustrates because the electric potential difference between development electromotive force and the photosensitive surface, the surface potential of photoreceptor when using the toner development sub-image photosensitive surface electromotive force of toner image (, have on it).Figure 12 C illustrates after toner image is transferred to Reiceiver sheet when putting on reverse biased on the Reiceiver sheet, the surface potential of photoreceptor.In this case, exposed portion have specific positive potential (for example among Figure 17 C+10V).

When after these imaging processes repeat, when photoreceptor is recharged, the surface potential of previous image part (for example :-690V) surface potential than another part is (that is ,-700V) low.When if half tone image forms in the zone that comprises previous image part and the non-image part in front, just the electric potential difference than non-image part in front and non-illuminated portion is big for the electric potential difference of previous image part and non-illuminated portion, thereby forms the big image (erect image) of density on the image section in front.

Described in JOP2002-123067, the residual image problem also appears in the digital picture formation method, wherein as being widely used in black spray formula Method of printing, has formed the half tone image of being made up of numeral point picture.

Especially, be formed on the photoreceptor with the illuminance that forms the some picture (latent dotimage) of diving inhomogeneously with hot spot (beam spot) form, and on the direction of the periphery from the center to the hot spot, have certain distribution.When hot spot image section in front formed, gained is dived, and just the latent some picture part than other was big for the area of some picture part, this be because for example+10V makes the some picture potential shift partly of diving.Therefore, the diameter of institute's invocation point toner image is bigger than the diameter of other parts dot image, thereby the point of observing expansion is intensive as part, causes forming residual erect image.In the high-resolution imaging, this phenomenon is just more remarkable, and for example: it is more obvious than using the imaging of 600dpi resolution to use the imaging of 1200dpi resolution.

Described in JOP 10-177261, think that the fluctuation of surface potential mainly is that storage by photoreceptor volume inside electric charge causes.In order to prevent the storage area electric charge, following method is disclosed.

(1) outermost layer of improvement photoreceptor

JOP 10-115946 discloses a kind of outermost layer and has comprised that polyarylate resin and specific inductive capacity are at least 2.3 photoreceptor.

JOP 11-184135 discloses a kind of outermost photoreceptor that has the photographic layer that comprises AZO pigments and comprise the polyarylate resin.According to disclosed content, the polyarylate resin has high-crystallinity, therefore can the CTM that be included in wherein be orientated to a certain extent.It is thought to the CTM orientation and uses special AZO pigments can reduce the potential barrier that electric charge injects, thereby the iconic memory performance of photoreceptor is diminished.

JOP 10-177263 discloses the electro-photography apparatus that photoreceptor is used to have intermediate transfer medium, and wherein this photoreceptor has CGL that comprises phthalocyanine compound and the outermost layer that comprises the bisphenols polycarbonate.It is believed that this effect is that combination because of these special compounds produces.

JOP 10-177264 discloses the electro-photography apparatus that photoreceptor is used to have the middle layer offset medium, and wherein this photoreceptor has CGL that comprises phthalocyanine compound and the outermost layer that comprises charge transfer polymer.It is believed that this effect is that combination because of these special compounds produces.

JOP 10-177269 discloses the electro-photography apparatus that photoreceptor is used to have the middle layer offset medium, and wherein this photoreceptor has the CGL that comprises phthalocyanine compound and the insulation outermost layer or the semiconduction outermost layer that comprise at least a resistance controlling agent.It is believed that this effect is that combination because of these special compounds produces.

JOP 2000-147803 discloses a kind of photoreceptor, wherein is used for its outermost layer from bisphenol-A and the Copolycarbonate that the monomer with specific arlydene obtains, as CTL.In disclosure, discussed and to have prevented that the electric charge with opposite polarity from injecting from outermost layer.

JOP 2001-235889 discloses the photoreceptor that a kind of outermost layer comprises surface-treated metal oxide microparticle, alcohol-soluble resin and pure dissolubility CTM.Discussed thermoplastic resin and can not be used as outermost adhesive resin in disclosed content, this is because the physical strength deficiency of this resin, and the solvent that is used for dissolving resin also dissolves photographic layer.It thinks that the CTM of the pure dissolubility of use can prevent to form afterimage.

JOP 2002-6528 discloses a kind of photoreceptor that has photographic layer and comprise the protective seam of at least a alkali metal and alkali earth metal.Wherein described by in protective seam, comprising such element, ionic conducting property can have been given this protective seam, thereby the photoreceptor that has excellent durability and do not store residual charge can be provided.Wherein also described by in protective seam, comprising CTM, can reduce residual charge, but the abrasion resistance of protective seam is very weak.

(2) improve photographic layer

JOP 2000-75521 discloses a kind of at least a gallium chlorine phthalocyaninate compound and hydroxy gallium phthalocyanine compound of comprising as CGM and the photoreceptor with CTM of hydrazone skeleton.The transfer memory performance and the iconic memory performance that can reduce photoreceptor in conjunction with specific CGM and CTM have been described in disclosed content.

JOP 2000-105478 discloses a kind of photoreceptor that comprises the AZO pigments photographic layer, and it is used to use the electro-photography apparatus of writing light inlet (imagewriting light) with the laser diode aura of the shorter wavelength of 380nm-500nm as image.It thinks and compares with α-titanyl phthalocyanine that the AZO pigments that is used for wherein has more weak iconic memory performance.

JOP 2001-305762 discloses the photoreceptor of a kind of CGM of comprising and CTM, wherein CTM comprises that polarization calculates dipole moment less than first compound of 1.8D with to have transmittance on the wavelength greater than first compound be 50% second compound greater than 70 with by structure optimization, and wherein polarization adopts semiempirical molecular orbital to calculate to use the PM3 parameter to calculate by structure optimization.Wherein described the absorption of second compound and exposed to the excessive light of photoreceptor, thereby the iconic memory performance of photoreceptor is weakened.

(3) improve CTL

JOP 7-92701 discloses a kind of multilayer photoreceptor, and wherein CGL comprises that titanyl phthalocyanine and CTL comprise at least two kinds of CTM, and wherein the difference of the oxidation potential between these at least two kinds of CTM is not more than 0.04V.It thinks to have the CTM of energy level much at one by use, be easy to occur the jump of electric charge carrier between the CTM, and the chance of being captured enemy personnel electric charge carrier by CTM can reduce, thereby reduced with transfer device and carried out reverse charging electrons excited quantity, the result prevents the afterimage problem.

JOP 08-152721 discloses a kind of photoreceptor that is used for backlight illumination (back-lighting) type high-velocity electrons photographic means, and wherein exposure imaging is the 10-150 millisecond at interval, wherein 2 * 10 ⁶The electric field of V/cm, the charge mobility of photoreceptor CTL is no less than 1 * 10 ^-6Cm ²/ V.sec.Wherein described, when photoreceptor has low dynamic photosensitivity, before development operation begins, can not be completed into sub-image, thereby the electromotive force of previous image part increases after repeated use; But, can improve dynamic photosensitivity, thereby can solve the problem of afterimage by using above-mentioned technology.

JOP10-177262 discloses a kind of photoreceptor that is used to have the electro-photography apparatus of intermediate transfer medium, and this photoreceptor has the CGL that comprises phthalocyanine compound and comprises and be selected from triphenyl amine compound and N, N, N ', the CTL of N '-tetraphenyl benzidine compound.It is believed that this effect is that combination because of these special compounds produces.

(4) improve CGL

JOP 06-313972 discloses a kind of photoreceptor, and wherein the thickness with CGL is increased at least 25 μ m or the content of CGM in CGL is increased at least 50% weight, makes a large amount of electric charge carriers be hunted down in CGL, so that the ghost image of gained is not obvious.

JOP 10-69104 discloses a kind of multilayer photoreceptor with CGL of the triarylamine compound that comprises xylyl.The surface of contact of having described in disclosed content between CGL and CTL has formed the barrier of carrier transport, thereby electric charge carrier is caught.Because the charge carrier of catching has reduced the space electric field among the CGL, the electromotive force of half tone image part does not reduce, and therefore forms afterimage in this part.By comprising CTM (that is, having the triarylamine of xylyl), the charge carrier that produces is injected CTL fast and transmit, thereby can prevent that the charge carrier of catching from gathering (that is the afterimage problem, occurring).

JOP 10-186696 discloses a kind ofly to have conductive base and is positioned at the photographic layer of one deck at least and the photoreceptor of layer protective layer at least on the covering substrates successively; wherein this photographic layer comprises the titanyl phthalocyanine dyestuff, its CuK α X-ray diffraction spectrum in Prague (2 θ) angle 9.5 degree, 24.1 degree and 27.3 degree observed strong peak.It is believed that this effect is to be produced by specific compound.

JOP 2002-107972 discloses the photoreceptor of a kind of CGL of having; this CGL comprises the hydroxy gallium phthalocyanine compound and is used as adhesive resin; and has a butyral resin of acetal group, acetyl group and hydroxyl; wherein the butyraldehyde degree of this butyral resin is at least 62% mole, and weight-average molecular weight (Mw) is at least 2.0 * 10 ⁵, number-average molecular weight is at least 5.0 * 10 ⁴It thinks the quantity that can reduce image-carrier by specific polyvinyl butyral, thereby can prevent the afterimage problem.

(5) cooperation by CGL and CTL improves

JOP 07-43920 discloses a kind of multilayer photoreceptor, and wherein specific AZO pigments is used for CGL and is used for CTL with the CTM with fluorene skeleton.It thinks that adding specific compound can prevent that photoreceptor from suffering light fatigue (light fatigue).It is believed that this effect is produced by specific compound.

JOP 09-211876 discloses a kind of negative pole sexual type photoreceptor with high γ, and wherein CGL comprises phthalocyanine compound, and p type CTL comprises and is selected from the material of being made up of inorganic P-type semiconductor and particulate t-selenium and charge transfer polymer.Wherein described p type CTL comprising that the transferring material that does not have the hole is a feature, thereby can prevent that positive hole mobile material is diffused among the CGL.Therefore, can prevent, thereby can prevent the problem of afterimage by catching that phthalocyanine color causes.

(6) improve undercoat (undercoat layer)

JOP 08-22136 discloses has the photoreceptor that comprises silane coupling agent and inorganic filler undercoat.Wherein described by forming this undercoat, the electric charge that flows to base material can flow to base material reposefully, thereby can prevent the afterimage problem.

In addition, JOP 11-184127 discloses a kind of photoreceptor, and its undercoat comprises having specific polyamic acid or polyamic acid ester structure, or the resin of polyimide structures and have the resin of cyanoethyl.It is thought by using this resin, can prevent that photoreceptor from suffering light fatigue.

JOP 2000-112162 discloses a kind of photoreceptor, even its undercoat comprises when the humidity of environment changes the almost immovable cross-linked resin of resistance.Wherein described: JOP 08-146639 discloses the undercoat that comprises many ring Kun, perylenes etc.; JOP 10-73942 discloses the undercoat that comprises Metallocenic compound, electronic receiving compound and melamine resin; JOP 08-22136 discloses the undercoat that comprises metal oxide microparticle and silane coupling agent; Disclose with JOP 09-258469 and to have comprised the undercoat that has by silane coupling agent surface-treated metal oxide microparticle.

Wherein described in the high sensitivity photoreceptor that in CGL, comprises titanyl phthalocyanine and excited a large amount of molecules and charge carrier, therefore have the molecule that charge separation does not take place in a large number, a large amount of electronics and holes tended to be retained in the photoreceptor in the electrophotographic processes of recharge and illumination in addition.

In order to address this problem, JOP 2000-112162 suggestion is used in combination polyamide and zirconium compounds, perhaps polyamide, zirconium alkoxide and dione compounds such as diacetone is used in combination as undercoat.In addition, JOP 2001-51438 suggestion cellulose-binding resin, zirconium compounds, zirconium alkoxide and dione compounds use as undercoat.

JOP 2001-305763 discloses a kind ofly to have undercoat and comprises CGM and the photoreceptor of CTM, wherein CTM comprises having dipole moment that polarization calculates greater than 70 with by structure optimization less than the material of 1.8D and specific aromatic amine compound, wherein polarization draws by adopt semiempirical molecular orbital computation structure computation optimization with the PM3 parameter, and wherein undercoat comprises the titanium dioxide fine particles of handling with organo-silicon compound and has the polyamide of specific diamine component as composition.In this is open, think, can easily transmit the charge carrier that is retained in the photographic layer by forming this undercoat.

JOP 2002-107983 discloses a kind of system, and wherein the volume averaging resistivity of photoreceptor undercoat is 10 ¹⁰-10 ¹²Ω .cm, the thickness of its CTL are not more than 18 μ m and electro-photography apparatus does not comprise quencher.It thinks and does not use quencher can prevent that photoreceptor from suffering light fatigue, and because undercoat has suitable resistance, can suppress electric charge and be injected into photographic layer from base material, therefore can prevent space charge gathering in photoreceptor.

(7) add adjuvant

JOP 10-177261 discloses the photoreceptor of the electro-photography apparatus that is used to have intermediate transfer medium, and wherein this photoreceptor has the CGL that comprises phthalocyanine compound and comprises the outermost layer with hindered phenol structured material.Think that this effect is produced by specific compound.

JOP 2000-292946 discloses a kind of photoreceptor with the CGL that comprises phthalocyanine color and two thio phenyl methyl compounds.Wherein described by using this material, can reduce the iconic memory performance of photoreceptor, thereby can prevent the positive echo problem.

(8) improve electronic camera technology

JOP 07-13374 has proposed a kind of technology, promptly gives the anti-phase charging of employed photoreceptor sometimes, makes it have opposite (just) electric charge, makes it stable then.

In photoreceptor, can induce by rayed and obtain a large amount of electric charge carriers with high sensitivity CTL.In this case, formed electronics with the hole similar number that injects CTL.If electronics is not discharged on the base material, electronics just remains among the CGL so, thereby tends to occur the afterimage problem.When this photoreceptor anti-phase (that is, normal incidence) is charged,, and in CGL, form electron trap from the base material electron injection.When carrying out rayed on this photoreceptor, the number difference of electron trap is very little between illumination part and the unexposed portion, and is not obvious thereby ghost image becomes.

JOP 07-44065 discloses a kind of technology, is about to put on the DC voltage of alternating voltage stack the base material of photoreceptor.By applying reverse biased to base material, can be from wherein discharging the electronics of catching the CGL.By the stack alternating voltage, can improve electric current, thereby can quicken the bias effect of opposite charges.

JOP 10-123802 discloses a kind of technology, promptly have on the multilayer photoreceptor of the CGL that comprises phthalocyanine compound charge (not being main charging), carry out light discharge then in the above,, then lead charging thereon if wherein the predetermined portions of photoreceptor arrives main live part.Wherein described by carrying out this formation method, after the space charge in photoreceptor therefrom discharges,, thereby can prevent the afterimage problem to the photoreceptor charging.

JOP 10-123855 discloses a kind of technology, and promptly giving in the electro-photography apparatus provides controlling agent, and it controls the transmission current that flow to used multilayer photoreceptor from transfer device, and wherein photoreceptor has the CGL that comprises phthalocyanine compound.It is big more wherein to have described transmission current, and the negative afterimage of formation is also remarkable more.Consider that its reason is as follows.When the image transfer printing, the non-illumination part of photoreceptor is injected in the hole, and the hole at the interface of CGL or the CTL on substrate surface be hunted down.The hole of catching is released in next charging process, thereby dark decay (dark decay) (that is, significantly sensibilization) strengthens, and causes forming negative afterimage.Therefore,, can also control the number of the electric charge carrier that injects photoreceptor, prevent the afterimage problem by the control transmission electric current.

JOP 2000-231246 proposes a kind of technology, promptly before charging to the photoactivate of photoreceptor, according to the ratio of light memory performance, determines that image is write light inlet and the light wavelength of discharging.

JOP 10-123856 proposes a kind of technology, promptly in order to prevent the problem of afterimage, before transfer process the photoreceptor with the CGL that comprises phthalocyanine compound is carried out rayed, so that the electromotive force of unexposed portion is reduced to 1/3 of electromotive force.It is thought by carrying out this irradiation, reduce the electric potential difference between exposed portion and the unexposed portion, thereby it is not obvious to make that afterimage becomes.

JOP 10-246997 discloses a kind of technology; promptly have in the electro-photography apparatus of photographic layer and the photoreceptor that comprises light-cured acrylic resinoid protective seam in use; a humidity sensor is provided near photoreceptor, the electric current of the voltage AC portion that provides by charger is provided according to humidity.Wherein described by using this technology, can reduce the chance that forms blurred picture.In addition, wherein also described this technology of use, the iconic memory performance of photoreceptor weakens, but does not wherein describe its mechanism.

JOP 2001-117244 discloses a kind of technology, promptly when using the photoreceptor of S-shape in order to prevent to form ghost image, the half life period of photoreceptor electromotive force under the control rayed, make its be at most exposure between light irradiation process and following developing process-development time at interval 1/10, wherein use xeroprinting flight time (TOF) method to measure this half life period.

Described in top (6) section, JOP 2002-107983 discloses a kind of technology, does not promptly use quencher, prevents that photoreceptor from suffering light fatigue.

JOP 2002-123067 discloses a kind of technology, promptly controls photoreceptor and charge condition and makes it satisfy following relation: | (V1-V2)/VH|＜0.020, wherein VH represents the electromotive force of the photoreceptor that charges; V1 represents the electromotive force of photoreceptor behind the 10T time dark decay, and wherein T represents that charging exposure at interval; Represent after wherein charging and rayed one are afterwards taken turns and finished, once more photoreceptor to be charged the electromotive force of photoreceptor behind the 10T time dark decay with V2.Particularly, wherein this technical description charging rate is improved having the short dark decay time, or charging makes it have low relatively electromotive force to photoreceptor.

Though above-described technology is used to prevent afterimage, it is found that these technology are not sufficient to obtain to have the electro-photography apparatus of good permanance and high-speed production qualitative picture.Therefore, the afterimage problem does not solve fully.

Owing to these reasons, need a kind of electro-photography apparatus, it can the high-speed production qualitative picture and has a problem that afterimage has been avoided in good permanance, good cleanablity and good transfer printing simultaneously.

Summary of the invention

Therefore, an object of the present invention is to provide can the high-speed production qualitative picture Electrophtography photosensor, it can obtain good permanance, good cleanablity and good transfer printing, and avoids the problem of afterimage.

Another object of the present invention provides the method for making this photoreceptor.

Another purpose of the present invention provides device and the handle box that image forms, and it can the high-speed production qualitative picture and do not cause the afterimage problem, and need not frequently change photoreceptor.

In brief, originally the these and other objects of the invention that can realize by Electrophtography photosensor will become more high-visible below, this Electrophtography photosensor comprises conductive base, cover (overlying) undercoat on conductive base, cover the photographic layer (photosensitivelayer) on the undercoat.Photographic layer comprises the charge generation layer (charge generation layer) that covers on the undercoat and covers charge transport layer (charge transport layer) on the charge generation layer.In addition, after undercoat and charge generation layer formed and cover on the conductive base, when in using the 360nm-740nm scope charge generation layer being had the rayed charge generation layer of high reflectance, the reflectivity of charge generation layer was 15-21%.

In the preferred above-mentioned Electrophtography photosensor, charge generation layer comprises the disazo pigment (disazo pigment) by following formula (I) expression.

Wherein, A and B represent the coupling agent residue (coupler remaininggroups) of following formula (II) to (VIII);

Wherein, X ¹Expression-OH ,-NHCOCH ₃With-NHSO ₂CH ₃, Y ¹Expression-CON (R ²) (R ³) ,-CONHN=C (R ⁶) (R ⁷) ,-CONHN (R ⁸) (R ⁹) ,-CONHCONH (R ¹²), hydrogen atom, COOH ,-COOCH ₃, COOC ₆H ₅And benzimidazolyl, wherein R ²And R ³Represent hydrogen atom, replacement or unsubstituted alkyl, replacement or unsubstituted aryl, replacement or unsubstituted heterocyclic independently, perhaps work as R ²And R ³(take together) Shi Keyu and their keys nitrogen-atoms even that combines forms ring, R ⁶And R ⁷Represent hydrogen atom, replacement or unsubstituted alkyl, replacement or unsubstituted aralkyl, replacement or unsubstituted aryl, replacement or unsubstituted styryl and replacement or unsubstituted heterocyclic independently, perhaps work as R ⁶And R ⁷Shi Keyu and their keys nitrogen-atoms even that combines forms ring, R ⁸And R ⁹Represent hydrogen atom, replacement or unsubstituted alkyl, replacement or unsubstituted aralkyl, replacement or unsubstituted aryl, replacement or unsubstituted styryl, replacement or unsubstituted heterocyclic independently, perhaps work as R ⁸And R ⁹Shi Keyu and their keys carbon atom even that combines forms optional have five yuan or the hexatomic ring that condenses aromatic rings, R ¹²Expression replacement or unsubstituted alkyl, replacement or unsubstituted aryl and replacement or unsubstituted heterocyclic, and Z represents to condense the aromatic ring structures of the many rings of formation or the residue of heterocycle structure with phenyl ring, this aromatic ring structure or heterocycle structure are selected from naphthalene nucleus, anthracene nucleus, carbazole ring, benzo carbazole ring, dibenzo-carbazole ring, dibenzofurans ring, benzo naphthols furans (benzonaphthofuran) ring, dibenzothiophen ring, and each in them can have at least one substituting group;

R wherein ⁴Expression hydrogen atom, replacement or unsubstituted alkyl and replacement or unsubstituted aryl;

R wherein ⁵Expression hydrogen atom, replacement or unsubstituted alkyl and replacement or unsubstituted aryl;

Wherein Y represent divalent aromatic hydrocarbon or wherein Y form heterocyclic radical with the N atom that connects with its key;

Wherein Y represent divalent aromatic hydrocarbon or wherein Y with and the N atom that connects of its key form heterocyclic radical;

R wherein ¹⁰Expression hydrogen atom, alkyl, carboxyl and carboxylic ester group (carboxyester group), Ar ¹Be to replace or unsubstituted aryl; With

R wherein ¹¹Expression hydrogen atom, alkyl, carboxyl and carboxylic ester group, Ar ²Be to replace or unsubstituted aryl.

Further preferred above-mentioned Electrophtography photosensor, charge generation layer comprises the disazo pigment by following general formula (1) expression.

Further preferred in above-mentioned Electrophtography photosensor, the reflectivity of charge generation layer is 17-19%.

Another aspect of the present invention provides a kind of electro-photography apparatus, it comprises above-mentioned Electrophtography photosensor, be used for charger that the photosensitive surface uniform charging is arranged, be used for the image irradiator (image irradiator) arranged to form electrostatic latent image (latent electrostatic image) thereon with the Electrophtography photosensor of rayed uniform charging, the developing apparatus that is used to use toner to make latent electrostatic image developing and arranges is used for developed image is transferred to the transfer device that receives material and arrange and is used to remove the clearer (cleaner) that remains in any toner on the photoreceptor and arrange.In electro-photography apparatus, Electrophtography photosensor also satisfies following relation: 12 (V/ μ m)≤electric field intensity (V/D)≤35 (V/ μ m), wherein D (μ m) represents the thickness of Electrophtography photosensor charge transport layer, and V (V) expression is because the absolute potential on charging Electrophtography photosensor surface.

Perhaps, electro-photography apparatus comprises Electrophtography photosensor, this photoreceptor has the charge generation layer that comprises disazo pigment (I), and is 35-65% for the transmittance (light transmittance) of the light that forms electrostatic latent image on Electrophtography photosensor.

Preferably in above-mentioned electro-photography apparatus, Electrophtography photosensor satisfies following relationship: 15 (V/ μ m)≤electric field intensity (V/D)≤32 (V/ μ m).

Further in the preferred above-mentioned electro-photography apparatus, be used to make the toner of latent electrostatic image developing for spherical.

Further preferred above-mentioned electro-photography apparatus also comprises the intermediate transfer device, wherein, to on Electrophtography photosensor, be transferred to this intermediate transfer device to form overlapping color toner image thereon by a plurality of independently color toner images with independently color toner (separate color toner) development in the first step, the independently coloured image that superposes thereon simultaneously is transferred to the reception material with the color toner image from middle transfer device then.

Further preferably in selectable electro-photography apparatus, charge generation layer comprises the disazo pigment by following formula (1) expression.

Another aspect of the present invention, a kind of handle box is provided, it comprises above-mentioned Electrophtography photosensor, be used for the Electrophtography photosensor of rayed uniform charging to form the optional image irradiator of electrostatic latent image thereon, with following at least a, preferred all: be used for charger that the surperficial uniform charging of Electrophtography photosensor is arranged; Be used for making latent electrostatic image developing and the developing apparatus arranged with toner; The image that is used for developing is transferred to the transfer device that receives material and arrange; Be used to clean the clearer that remains in any toner on the Electrophtography photosensor and arrange; And be used to make the Electrophtography photosensor surface-discharge and the quencher (device) arranged (quencher).

Another aspect of the present invention provides the method for making above-mentioned photoreceptor, and it may further comprise the steps: form conductive base, cover the undercoat of conductive base, form charge generation layer that covers undercoat and the charge transport layer that covers charge generation layer.

The description of the following preferred implementation of the present invention that consideration combines with accompanying drawing, it is high-visible that these and other purposes, features and advantages of the present invention will become.

Description of drawings

When considering with accompanying drawing, can fully understand more and various other purposes of the present invention easier to understand, feature and attendant advantages from describe in detail that mark identical in the whole accompanying drawing is represented identical counterpart, and wherein:

Fig. 1-the 6th, the synoptic diagram of electro-photography apparatus embodiment of the present invention.

Fig. 7 and 8 is cross sectional representation of photoreceptor embodiment of the present invention;

Fig. 9-the 11st, the synoptic diagram of explanation afterimage problem; With

Figure 12 A-12C is a synoptic diagram of explaining photoreceptor potential change in the imaging process.

Embodiment

The present inventor finds that the electro-photography apparatus of high-speed production video high density often produces the afterimage problem, but by using a kind of Electrophtography photosensor, the electric field intensity (V/D) that has specific reflectivity or specific transmittance and particular range in its irradiates light wave band (wavelength band) at this photoreceptor, and make by disazo pigment with ad hoc structure, can suppress the appearance of afterimage effectively, wherein D (μ m) is the thickness of the CTL of photoreceptor, and V (V) is because charging causes the absolute voltage of photosensitive surface.

Usually, the Electrophtography photosensor of sandwich construction has negative effect such as sensitivity (sensitivity) variation, and the reflection of light rate with high reflectance is risen or CGL when the transmittance of light with image radiation source wavelength is reduced (the thickness attenuation of CGL) as CGL, the voltage of exposed portion rises.The reason that use has the wavelength of high reflectance is because it is easy to determine and grasp.Yet the present inventor finds that disazo pigment can suppress these negative effects effectively.

Usually the prepared in reaction AZO pigments in the presence of salt with aryl diazonium salt and coupling component (coupling agent).In polytype combination, usually use have at least two azo groups AZO pigments for example disazo pigment or trisazo pigment as CGM.For example the influence of sensitivity is very big to static characteristic for the structure of these AZO pigments.

For these AZO pigments, according to the very preferred aphthols coupling agent of sensitivity.Yet the state as the AZO pigments particulate of the CGM of Electrophtography photosensor is depended in the change of sensitivity.

Because the hydrogen bond of the residual base of coupling agent, the disazo pigment of being represented by general formula (I) of the present invention (that is: the disazo pigment of being represented by general formula (II)-(VIII) with the residual base of coupling agent) that is used for has stable intermolecular combining form (intermolecular associate forming state).In addition, when forming the disazo pigment layer on Electrophtography photosensor, the graininess of the disazo pigment of gained is highly stable.Because these factors, the photoreceptor of being made by these disazo pigments has excellent initial sensitivity, excellent maintainability and excellent photostability.Therefore, can raise to having the voltage that high reflectance reflection of light rate or the transmittance in photoreceptor irradiates light wave band suppress counter productive such as sensitivity decline and exposed portion by improving.

Residue X in formula (II) to (VIII) ¹, Y ¹, R ¹To R ¹², Y, Z, Ar ¹, Ar ²As above definition.Key in formula (II) between coupling agent and the azo group is for X ¹Or Y ¹Can be the optional position, but preferably at X ¹The ortho position.

Replace or unsubstituted alkyl is preferably and comprises 1 to 20 carbon atom, more preferably 1 to 10 carbon atom, the alkyl of 1 to 4 carbon atom most preferably.Suitable example is methyl, ethyl, propyl group, butyl, amyl group, vinyl, allyl, cyclohexyl, suberyl, 2-ethylhexyl etc.

Replace or unsubstituted aryl is preferably and comprises 6 to 18 carbon atoms, more preferably 6 to 14 carbon atoms, the aryl of 6 to 10 carbon atoms most preferably.Suitable example is benzene, naphthalene, anthracene, phenanthrene, fluorenes, etc.

Replacement or unsubstituted aralkyl preferably comprise 6 to 18 carbon atoms and comprise 1 to 10 carbon atom in alkylidenes in aryl, more preferably comprise 6 to 10 carbon atoms and comprise 1 to 4 carbon atom in aryl in alkylidene.Suitable example is benzyl and diphenyl methyl.

Replace or unsubstituted heterocyclic preferably comprises 2 to 20 carbon atoms, more preferably 2 to 10 carbon atoms; With 1 to 3, and preferred 1 heteroatoms that is selected from nitrogen, sulphur and oxygen.Preferred heteroatoms is nitrogen or oxygen.Suitable example is furans, thiophene, pyrrolin, oxazole, thiazole, pyrazoles, isoxazole, imidazoles, coumarone, indoles, benzoxazole, benzothiazole, benzimidazole, carbazole, morpholine, pyridine, quinoline, acridine, pyrimidine, pyrazine, pyrans, α-chromene and xanthene.

Replace or unsubstituted aromatic hydrocarbon group Ar ¹And Ar ²Preferably have about 6 to 30 carbon atoms, more preferably 6 to 14 carbon atoms, most preferably 6 to 10 carbon atoms.It can be the above-mentioned aryl of listing and any in the aralkyl.Preferred Ar ¹And Ar ²Be phenyl and benzyl.

Abovementioned alkyl, aralkyl, aryl, aryl and heterocyclic radical can have one or more substituting groups separately.These substituting groups are preferably selected from-OH ,-SH ,=O ,-NR ¹³R ¹⁴, R wherein ¹³And R ¹⁴Be H or C independently _1-4Alkyl, C _6-10Aryl, C _1-4Alkoxy, C _1-4Alkyl sulfide (alkylthio) ,-C _6-10Aryloxy group, halogen (Cl, F, Br, I), carboxyl, carboxyl C _1-4Ester, nitro, sulfinyl and sulfonyl.Preferred substituents be methyl, ethyl, methoxyl, dimethylamino ,-OH ,-Cl ,-F ,=one or more in O and the carboxyl.

That is to say that in order to suppress to occur afterimage, be used to have the disazo pigment with ad hoc structure of electron production layer photoreceptor by use, can obtain can be with the electro-photography apparatus of high-speed production qualitative picture.Wherein this electron production layer has the specific reflectance of light with high reflectance wavelength or have specific transmittance in the irradiates light wave band, and has the electric field intensity (V/D) of particular range.About reflectivity, after forming undercoat and CGL, measure the reflectivity of determining CGL in the scope of spectrophotometric tintmeter at 360nm-740nm by using, no matter cover specification such as kind and the thickness that CGL goes up CTL, can obtain stable value.In addition, before applying, the amount of the CGL that adheres to can be determined, thereby the coated conditions of CGL can be controlled by the feedback of coating processes as outermost CTL.

When to the reflection of light rate that on CGL, shows high reflectance wavelength when too low or when the transmittance of CGL in the irradiates light wave band is too low (, the thickness of CGL is enough thick in transmittance is reduced), optical characteristics such as optics fail, be that photosensitivity in most of the cases is excellent, but charge stability tend to understand when variation is also in the dark reused deterioration.In addition, this photoreceptor is easy to be subjected to the influence of reverse biased at transfer section.Thereby when photoreceptor recharges, with the irradiator illuminated portion with do not occur electric potential difference between the illuminated portion.So, partly obtained afterimage having the intensive shadow tone that writes.

Therefore, be good at CGL to the photoreceptor that the light with high reflectance has high reflectance, the photoreceptor that perhaps has thin CGL (that is the emission of light in the irradiates light wave band (light emittance) height) is good.Yet when reflectivity or transmittance were too high, the electromotive force of optical attenuator characteristic variation and exposed portion rose.In addition, when reflectivity or transmittance are high, and when electric field intensity is big, reuse photoreceptor, the electrostatic stress on the photographic layer increases, and causes the accumulation of light fatigue.Therefore tend to occur afterimage in this case.Importantly control electric field intensity in low scope.

Yet when electric field intensity was low, the static contrast of acquisition (electrostatic contrast) was tended to deficiency.Therefore, importantly after postradiation optical attenuator, the electromotive force of Electrophtography photosensor fully descends.Yet when not using suitable material, the optic response of photoreceptor is good, and is not enough but the static contrast becomes, and this forms problem with regard to having caused image.The disazo pigment by following general formula (I) expression that found that to the thoroughgoing and painstaking research of polytype compound satisfies above-mentioned characteristic.

Finished the present invention whereby.In addition, made handle box and electro-photography apparatus, this device can use the electrofax mechanism of this production qualitative picture to produce panchromatic (full color) image and not have afterimage.

Be used for Electrophtography photosensor of the present invention with reference to the accompanying drawing detailed description.

At first, describe electro-photography apparatus with reference to the accompanying drawings.

Fig. 1 is the synoptic diagram of the embodiment of electro-photography apparatus of the present invention, and the change of describing in the back also within the scope of the invention.

Among Fig. 1, photoreceptor 1 is the Electrophtography photosensor that satisfies demand of the present invention.

Photoreceptor 1 is rotating cylinder shape (drum), but also can use the photoreceptor that has as sheet shape and endless belt shape (endless belt-form).

Around photoreceptor 1, contact or close the setting with photoreceptor 1: reduce the discharge lamp 10 that remains in the electric charge on the photoreceptor 1, layout is used for to the charger 2 of photoreceptor 1 charging, use imaging irradiation photoreceptor 1 on photoreceptor 1, to form the imaging irradiator 3 of electrostatic latent image, with toner 5 development sub-images with the image developing apparatus 4 that on photoreceptor 1, forms toner image and the clearer that comprises cleaning blade 7 on cleaning photoreceptor 1 surface.The toner image that will be formed on the photoreceptor 1 by transfer device 6 is transferred to reception material 8 (as: Reiceiver sheet).To receive toner image photographic fixing thereon on the material 8 by fuser (fixer) 9.

Can use arbitrarily known charger as: charger unit, corona tube charger (scorotrons), solid-state charger and cylinder charger are as charger 2.In these chargers, preferably use contact charging device and short distance (short range) charger according to power consumption.Particularly, more preferably use the short distance charger, it forms suitable slit and simultaneously photoreceptor is charged between charger and photosensitive surface.

Can use above-mentioned known charger as transfer device 6, wherein, preferred combination is used transfer printing charger and the charger that separates.

The suitable light source that is used for imaging irradiator 3 and discharge lamp 10 comprises fluorescent light, tungsten lamp, Halogen lamp LED, mercury lamp, sodium vapor lamp, light emitting diode (LEDs), laser diode (LDs), uses the light source of electroluminescence (EL) etc.In addition, in order to obtain the light of required wavelength coverage, can use wave filter to cut off wave filter, dichroic filters, interference filter, colour temperature switched filter etc. as: sharp filter, bandpass filter, near infrared ray.

When the toner image that will form on photoreceptor 1 by image developing apparatus 4 was transferred to Reiceiver sheet 8, not all toner image all was transferred on the Reiceiver sheet 8, and toner particle remains in the surface of photoreceptor 1.Remove residual toner by clearer 7 from photoreceptor 1.The clearer that is suitable as clearer 7 comprises the cleaning blade of being made by rubber, hairbrush and big hairbrush (mag-fur).

When will be in advance just the photoreceptor 1 of (or negative) charging when being exposed to imaging, on photoreceptor 1, forms the electrostatic latent image that just has (or bearing) electric charge.When the toner that has negative (or just) electric charge when use just makes (or negative) developing latent charge image, can obtain erect image.On the contrary, when use just has (or negative) electric charge toner when just making (or negative) developing latent charge image, can obtain negative-appearing image (that is inverted image (reversed image)).Can use known developing method as developing method.In addition, also can use known charging method as charging method.

Fig. 2 is the synoptic diagram of another embodiment of electrophotographic method of the present invention.Photoreceptor 11 is the Electrophtography photosensors that satisfy requirement of the present invention, and is band shape.By cylinder R1 and R2 band shape photoreceptor 11 is rotated.The charging of photoreceptor 11 usefulness chargers 12, but thereby the imaging of launching with light illuminator 13 then exposes form electrostatic latent image on photoreceptor 11.Use image developing apparatus 14 that image development is made and on photoreceptor 11, form toner image.Use transfer device 16 that toner image is transferred on the Reiceiver sheet (not shown).After the toner image transfer process, use the light illuminator 18 of precleaning to carry out using Clean Brush for cleaning 17 to clear up the surface of photoreceptors 11 after the operation of precleaning rayed.Then, use light to make photoreceptor 11 exposures, to reduce electric charge residual on it by charging source 19 emissions.In the precleaning light irradiation process, light is from substrate surface irradiation photoreceptor 11.In this case, base material must be a printing opacity.

Be used for electrophotographic method of the present invention and be not limited to as illustrated in fig. 1 and 2 method.For example, in Fig. 2, can carry out the operation of precleaning rayed from the sensitization aspect of photoreceptor 11.In addition, in imaging irradiation process and discharge process, can carry out rayed from the substrate surface of photoreceptor 11.

In addition, the pre-transfer rayed operation that can carry out before the transfer printing toner image, carrying out; But the preliminary rayed operation of before the imaging irradiation, carrying out; And other rayed operation.

Above-mentioned image-generating unit (image forming unit) can be fixedly installed in electro-photography apparatus as duplicating machine, facsimile recorder and printing machine.Yet, image-generating unit can be installed on wherein as handle box.Handle box is meant following image-generating unit, and it comprises that photoreceptor and following at least one are a plurality of or whole: charger, imaging irradiator, image developing apparatus, transfer apparatus, clearer and quencher (device).

The plural types of processings box can be used for the present invention.Fig. 3 shows of handle box of the present invention

Embodiment.

Among Fig. 3, handle box comprises photoreceptor 21 of the present invention, layout is used for the charger 22 to photoreceptor 21 chargings, use toner will develop by the electrostatic latent image that imaging irradiator 23 forms on photoreceptor to form the image developing apparatus (developing roller) 24 of toner image, toner image is transferred to transfer device 26 that receives material 28 and the cleaning blade 27 that cleans photoreceptor 21 surfaces.Icon 29 and 30 is represented fuser and quencher respectively.Photoreceptor 21 is rotating cylinder shapes, but also can use the photoreceptor as sheet shape and endless belt shape.

Fig. 4 shows another embodiment of electro-photography apparatus of the present invention.With reference to figure 4, the photoreceptor 31 of electro-photography apparatus is a photoreceptor of the present invention.Around photoreceptor 31, charger 32, imaging irradiator 33 be set, have black image developing apparatus 34BK, the image developing unit 34 of cyan (cyan) image developing apparatus 34C, magenta color image developing apparatus 34M and yellow image developing apparatus 34Y, as the intermediate transfer belt 40 and the clearer 37 of intermediate transfer medium.

Image developing apparatus 34Bk, 34C, 34M and 34Y can control independently, and each image developing apparatus can independent operation when needed.The toner image that will be formed on the photoreceptor 31 by first transfer device 36 is transferred to intermediate transfer belt 40.Have only when the toner image on the photoreceptor 31 is transferred on it, by first transfer device 36, intermediate transfer belt 40 beginnings contact with photoreceptor 31.The toner image that will be superimposed upon on the intermediate transfer belt 40 by second transfer device 46 is transferred to reception material 38, by fuser 39 toner image is fixed to then and receives material 38.Have only when carrying out transfer operation, second transfer device 46 just contacts with intermediate transfer belt 40.

Form in the device in electrofax, the color toner image is transferred on the reception material that static adheres to the transfer printing rotating cylinder with rotating cylinder shape transfer apparatus.Therefore, can not on ground paper, form image.Yet, in electro-photography apparatus as shown in Figure 4, on intermediate transfer belt, form each toner image, then overlapping toner image is transferred to the reception material.Therefore, can on the reception material of any kind of, form image.The formation method of use intermediate transfer medium can be used for the electro-photography apparatus shown in Fig. 1 to 3 and 5, also can be used for the electro-photography apparatus shown in Fig. 4 and 6.

Fig. 5 shows another embodiment of electro-photography apparatus of the present invention.

Electro-photography apparatus has four kinds of color imaging sections (image forming section), just yellow, magenta, cyan and black imaging session.Imaging session comprises photoreceptor 51Y, 51M, 51C and 51BK respectively.The photoreceptor 51 that is used for electro-photography apparatus satisfies requirement of the present invention.

Around each photoreceptor (51Y, 51M, 51C or 51BK), charger (52Y, 52M, 52C or 52BK) is being set, imaging irradiator (53Y, 53M, 53C or 53BK), image developing apparatus (54Y, 54M, 54C or 54BK) and clearer (57Y, 57M, 57C or 57BK).In addition, the input/transfer belt 60 that is arranged on below the imaging session stretches tightly by cylinder R3 and R4.By transfer device 56Y, 56M, 56C and 56BK will import/transfer belt 60 is connected or separates with photoreceptor 51, receives material 58 so that toner image is transferred to from photoreceptor 51.By fuser 59 the color toner image of gained is fixed.

The electro-photography apparatus of tandem type as shown in Figure 5 (tandem-type) has a plurality of photoreceptors 51 that are used to form four-color image, and color toner image that can parallel formation is transferred to and receives on the material 58.Therefore, this electro-photography apparatus can be to form full-colour image such as the higher speed of electro-photography apparatus shown in Figure 4.

Fig. 6 shows another embodiment of electro-photography apparatus of the present invention, and it is the tandem color electronic camera with intermediate transfer medium.

This electro-photography apparatus has four look imaging sessions, i.e. yellow, magenta, cyan and black imaging session.Imaging session comprises photoreceptor 71Y, 71M, 71C and 71Bk respectively.The photoreceptor 71 that is used for electro-photography apparatus satisfies requirement of the present invention.

At each photoreceptor (71Y, 71M, 71C or 71BK) on every side, charger (72Y, 72M, 72C or 72Bk) is set, imaging irradiator (73Y, 73M, 73C or 73Bk), image developing apparatus (74Y, 74M, 74C or 74BK) and clearer (77Y, 77M, 77C or 77BK).In addition, the intermediate transfer belt 80 that is arranged under the imaging session is tightly stretched by cylinder R5 and R6 and other cylinder.By transfer device 76Y, 76M, 76C and 76BK intermediate transfer belt 80 is connected or separates with photoreceptor, make and accept toner image from photoreceptor.The color toner image that will form on intermediate transfer belt 80 by transfer device 86 is transferred to reception material 78 at once.Pass through fuser 79 then with the color toner image fixing.

Next, describe Organophotoreceptor of the present invention with reference to the accompanying drawings in detail.

Fig. 7 shows the schematic cross-section of an embodiment that the present invention has the photoreceptor of layer structure.Photoreceptor has conductive substrate 101, charge generation layer (CGL) 102 and charge transport layer (CTL) 103.

Fig. 8 shows the schematic cross-section of another embodiment that the present invention has the photoreceptor of layer structure.Photoreceptor has the structure that has formed undercoat 104 between as shown in Figure 7 base material 101 and CGL 102.

The material that is suitable as conductive substrate 101 comprises that it is 10 that specific insulation is not more than ¹⁰The material of Ω .cm.The object lesson of this material comprises the cylinder or the diaphragm of plastics or paper, for example form metal in its surface by method as gas deposition and sputter: aluminium, nickel, chromium, nickel-chrome, copper, gold, silver, platinum, iron etc., or metal oxide is for example: tin oxide, indium oxide etc.In addition, can use for example aluminium, aluminium alloy, nickel and stainless sheet metal.Also can use metallic cylinder as base material 101, it is by with for example stretching, impact molding, extrusion molding, extruding and stretch or cutting, then to the surface of pipe cut, disposal routes such as superfinishing, polishing, for example aluminium, aluminium alloy, nickel and stainless steel are made tubular and preparation with metal.

Photographic layer of the present invention is the multilayer photographic layer, and it has CGL102 and is superimposed upon CTL103 on the CGL102 on conductive substrate 101.The structure of every layer of multilayer photographic layer is described now.

(CGL)

CGL102 comprises the CGM as principal ingredient, the optional adhesive resin that comprises.As being used for CGM of the present invention, consider above-mentioned characteristic, at least a key component is the disazo pigment by aforementioned formula (I) representative.The object lesson of this disazo pigment is included in the compound that its each end has the benzene ring substitution group of ortho position chlorine; for example: (2; 7-pair (3-(2-chlorphenyl) carbamyl-2-hydroxyl-1-naphthyl azo]-the 9-Fluorenone, be the disazo pigment that has by the structure of following formula (1) expression by particularly suitable preferred example in the compound of formula (I) representative.

These CGM can use separately or be used in combination.

The optional suitable bonding resin that is included among the CGL comprises resins such as polyamide, polyurethane, epoxy resin, polyketone, polycarbonate, polyarylate, silicone resin, acrylic resin, polyvinyl butyral, polyvinyl formal, polyvinyl ketone, polystyrene, poly N-vinyl carbazole, polyacrylamide.

These resins can use separately or be used in combination.

In addition, charge transfer polymer can be used as the adhesive resin of CGL.In addition, low-molecular-weight CTM can be added CGL if desired.

CTM is divided into positive hole mobile material and electron transport material, also is divided into low-molecular-weight CTM and charge transfer polymer.

The object lesson of electron transport material comprises that electronics for example receives material: chloranil, tetrabromoquinone, TCNE, four cyano quinone bismethane, 2,4,7-trinitro--9-Fluorenone, 2,4,5,7-tetranitro-9-Fluorenone, 2,4,5,7-tetranitro xanthone, 2,4,8-trinitro-thioxanthones, 2,6, and 8-trinitro--4H-indeno (1,2-b) thiophene-4-ketone, 1,3,7-trinitro-dibenzothiophene-5,5-dioxide etc.

Can use or be used in combination these electron transport materials separately.

Object lesson Bao Kuo oxazole derivant, oxadiazole derivant, imdazole derivatives, triphenylamine derivant, the 9-(to diethylamino styryl anthracene), 1 of positive hole mobile material, 1-pair-(4-dibenzyl amino phenyl) propane, the styryl anthracene, the styryl dihydropyazolo, phenyl hydrazones, α-phenyl stilbene derivatives, thiazole, triazole derivative, azophenlyene derivant, acridine derivatives, benzofuran derivatives, benzimidizole derivatives, thiophene derivant etc.

Can separately or be used in combination positive hole mobile material.

The suitable method for optimizing that is used to form CGL comprises curtain coating (casting) method from the solution dispersant system.

The casting method that forms CGL generally includes the following step:

(1) by with solvent for example: tetrahydrofuran, cyclohexanone, diox, ethylene dichloride, butanone etc. mix with above-mentioned CGM, choose wantonly with adhesive resin and adjuvant and be mixed with coating liquid, with bowl mill, masher, sand mill etc. it is disperseed the applying liquid with preparation CGL then;

(2) in case of necessity with the dilution of this CGL applying liquid, for example use: immersion coating, spraying, pearl are coated with methods such as (bead coating) and ring are coated with, and it is coated on the base material; With

(3) the dry liquid that applies forms CGL

The thickness of the CGL of above-mentioned formation meets the following conditions: after forming undercoat and CGL, when using spectrophotometric tintmeter when 360nm-740nm measures, CGL is 15-21% to the reflection of light rate with the highest reflectivity, preferred 17-19%; And/or CGL is 35-65% and preferred 40-55% to the transmittance of light with the wavelength that is used for image irradiation.When transmittance is too low (CGL form thickness be enough to reduce transmittance), in most of the cases its feature such as optical attenuator, i.e. photosensitivity excellence, but charge stability tends to degenerate, can deterioration thereby in the dark reuse.In addition, tend to be subject to the influence of reverse biased at this photoreceptor of transfer section.Thereby when photoreceptor recharges, in the part by irradiator irradiation with there is not to occur between the illuminated portion electric potential difference.So, partly obtain afterimage in the intensive shadow tone that writes.

Therefore, reduce the content of the CGL adhered to, promptly have undercoat and on CGL the light to the wavelength that demonstrates high reflectance have the CGL that high reflectance is arranged, and/or to have thin CGL (i.e. transmittance height in the wave band of irradiates light) be favourable.Yet when reflectivity and/or transmittance were too high, the electromotive force of optical attenuator characteristic variation and exposed portion rose.

(CTL)

Next, CTL103 is described now.

Usually prepare CTL103 by following method, promptly prepare the CTL applying liquid, wherein CTM and adhesive resin or charge transfer polymer mixtures of material are dissolved or are distributed in the solvent, apply this applying liquid then, then carry out drying.

The object lesson that is used as the polymkeric substance of CTL adhesive resin for example comprises thermoplastic resin and thermoset resin: polystyrene, styrene/acrylonitrile copolymer, styrene/butadiene copolymers, phenylethylene/maleic anhydride copolymer, polyester, Polyvinylchloride, vinyl chloride/vinyl acetate co-polymer, polyvinyl acetate (PVA), polyvinylidene chloride, polyarylate, polycarbonate, the cellulose acetate resin, ethyl cellulose resin, polyvinyl butyral, polyvinyl formal, polyvinyl toluene, acrylic resin, silicone resin, fluorine resin, epoxy resin, melamine resin, urethane resin, phenolics and alkyd resin, but be not limited to this.

These polymeric materials can use separately or be used in combination.In addition, also can use the multipolymer of above-mentioned polymeric material monomer.In addition, also can use the multipolymer of monomer and CTM.

When the advantages of excellent stability that has the environmental baseline of bearing for the photoreceptor that makes gained and during the polymkeric substance of electricity consumption inertia, can preferably use resin such as polyester, polycarbonate, acryl resin, polystyrene, polyvinylidene chloride, tygon, polypropylene, fluorine resin, polyacrylonitrile, vinyl cyanide/styrene/butadiene copolymers, vinyl cyanide/styrol copolymer and ethylene/vinyl acetate copolymer.The charge transfer polymer material of electricity inertia is meant the structure with photoconductive property, as the polymkeric substance of three arylamine structures.

When these resins are used with adhesive resin as adjuvant, consider the photosensitivity of gained photoreceptor, its content is preferably 50% weight of the total amount that is not more than bonding agent and adjuvant.

The object lesson that is used for the CTM of CTL comprises above-mentioned low-molecular-weight electron transport material, low-molecular-weight positive hole mobile material and charge transfer polymer material.

When using low-molecular-weight CTM, be included in wherein resin Composition for per 100 weight portions, its content is the 40-200 weight portion, preferred 70-150 weight portion.When using charge transfer polymer, for wherein the charge transfer component of being included in of per 100 weight portions, its content is the 0-500 weight portion, preferred 0-150 weight portion.

When CTL comprised two kinds or more of CTM, the difference of the ionic potential between two or more CTM was as much as possible little, and this difference preferably is not more than 0.15ev particularly.In this case, prevented the trap (trap) of one of CTM wherein as other CTM.

In order to give the photoreceptor better photosensitivity, the resin Composition that the content of CTM in CTL is preferably per 100 weight portions among the CTL is not less than 70 weight portions.

The suitable solvent that is used for the CTL applying liquid comprises: ketone is methyl ethyl ketone, acetone, methyl isobutyl ketone and cyclohexanone for example; Ether is: diox, tetrahydrofuran and ethyl cellosolve for example; Arsol is toluene and dimethylbenzene for example; Halogen-containing solvent is chlorobenzene and methylene chloride for example; Ester is ethyl acetate and butyl acetate for example; Or the like.These solvents can use separately or be used in combination.

If desired, CTL for example can comprise one or more adjuvants: antioxidant, plastifier, lubricant and ultraviolet light absorber.Below mention the example that it is concrete.For per 100 weight portions resin Composition wherein, these adjuvants that add 0.1-50 weight portion content preferably add the 0.1-20 weight portion in CTL.For per 100 weight portions resin Composition wherein, add the levelling agent (leveling agent) of 0.001-5 weight portion content.

The suitable painting method that is used to apply the CTL applying liquid comprises that dip coating, spraying process, ring are coated with (ring coating) method, roller coat (roll coating) method, intaglio plate (gravure coating) cladding process, the mouth of pipe applies (nozzle coating) method and silk screen applies (screen coating) method etc.In these methods, preferred spraying process is because it is easy to prevent the filler gathering.

The thickness of CTL is generally 15-40 μ m, preferred 15-30 μ m.When hope formation had the image of excellent resolution rate, the thickness of CTL preferably was not more than 25 μ m.Also must consider the electric field intensity of electro-photography apparatus.The value V/D of electric field intensity is aforesaid 12 (V/ μ m)-35 (V/ μ m), preferred 15-32 (V/ μ m), and wherein D (μ m) represents the thickness of photoreceptor CTL, V (V) expression is because the absolute potential of the photosensitive surface that charging causes.

In addition, when electric field intensity was high, the electrostatic stress on the photographic layer increased, and caused light fatigue to increase.Therefore when electric field intensity was low, the static contrast of acquisition was tended to deficiency.Therefore, importantly has the electromotive force that is applicable to used CGL thickness.

(undercoat)

In photoreceptor of the present invention, can form undercoat 104 between base material 101 and the CGL102 to improve the bounding force between base material and the photographic layer, prevent to form moir é striped, improve tectal paintability, reduce residual electromotive force and prevent that electric charge from injecting photographic layer from base material.

Undercoat generally includes resin as key component.Because usually the liquid that comprises organic solvent by coating forms photographic layer on undercoat, the resin in the undercoat preferably has good resistibility for ordinary organic solvents.

The object lesson of this resin comprises that water soluble resin for example: polyvinyl alcohol resin, casein and polyacrylic acid sodium salt; Alcohol-soluble resin is for example: the nylon resin of nylon copolymer and methoxyization: and for example can form three-dimensional netted thermoset resin: and urethane resin, melamine resin, alkyd-Melantine, epoxy resin etc.

Undercoat can comprise the powder of thin metal oxides such as titanium dioxide, silicon dioxide, alumina, zirconia, tin oxide and indium oxide.

Also can apply applying liquid, form undercoat by using appropriate solvent and the above-mentioned suitable painting method that is used for photographic layer.

In addition, also the metal oxide layer that forms by the sol-gel process of using silane coupling agent, titanium coupling agent or chromium coupling agent can be used as undercoat.

In addition, alumina layer that forms by anodised method and the organic compound that forms by vacuum evaporation method as poly-terephthaldehyde's support or mineral compound as SiO ₂, SnO ₂, TiO ₂, ITO or CeO ₂Layer, also be preferably used as undercoat.

The thickness of undercoat is preferably 0.1-10 μ m, is preferably 1-5 μ m.

In photoreceptor of the present invention, can be at one or more layers of photographic layer, that is: adopt one or more adjuvants as antioxidant, plastifier, ultraviolet light absorber, low-molecular-weight charge transport materials and levelling agent, improving the stability of outermost gas barrier property of photoreceptor and opposing environmental baseline thereof in CGL, CTL and the undercoat.

Be the typical material of these compounds below.

(antioxidant)

The suitable antioxidant that is used for the layer of photoreceptor comprises following compounds, but is not limited in this.

(a) phenolic compound

2; 6-two-tert-butyl group-paracresol; 2; 4; 6-three-tert-butyl phenol (phenol); just-octadecyl-3-(4 '-hydroxyl-3 '; 5 '-two-tert-butyl phenol) propionic ester; the phenol of styreneization; 4-methylol-2; 6-two-tert-butyl phenol; 2; 5-two-tert-butyl quinhydrones; cyclohexyl phenol; butylated hydroxyanisole (BHA); 2; 2 '-methylene-two-(4-ethyl-6-tert-butyl phenol); 4; 4 '-the isopropylidene bis-phenol; 1; two (4-hydroxy benzenes) cyclohexanes of 1-; 4; 4 '-methylene-two (2; 6-two-tert-butyl phenol); 2; 6-pair (2 '-hydroxyl-3 '-tert-butyl group-5 '-the methylbenzene methyl)-the 4-sylvan; 1; 1; 3-three (2-methyl-4-hydroxyl-5-tert-butyl-phenyl) butane; 1; 3; 5-trimethyl-2,4,6-three (3; 5-two-tertiary butyl-4-hydroxy benzyl) benzene; four (methylene-3-(3 '; 5 '-di-t-butyl-4-hydroxyphenyl) propionic ester) methane; three (3,5-two-tert-butyl-hydroxy phenyl) isocyanates; three [β-(3,5-two-tert-butyl-hydroxy phenyl) propiono-oxygen ethyl (oxyethyl)] isocyanates; 4; 4 '-thiobis (4-methyl-6-tert butyl phenol); 4,4 '-thiobis (4-methyl-6-tert butyl phenol) etc.

(b) amines

Phenyl-a-naphthylamine, PBNA, N, N '-diphenyl-p-phenylenediamine (PPD), N, N '-two-betanaphthyl-p-phenylenediamine (PPD), N-cyclohexyl-N '-phenyl-p-phenylenediamine (PPD), N-phenylene-N '-isopropyl-p-phenylenediamine (PPD), aldol (aldol)-alpha-naphthylamine, 6-ethoxy-2,2,4-trimethyl-1,2-dihyaroquinoline etc.

(c) sulfocompound

Thiobis (betanaphthol), thiobis (N-PBNA), 2-sulfydryl (mercapto) benzothiazole, 2-mercaptobenzimidazole, dodecyl mercaptans, tetramethylthiuram monosulfide (tetramethylthirammonosulfide), tetramethylthiuram disulfide, dibutyl sulfide carbamic acid nickel, proxam, dilauryl thiodipropionate, distearylthiodi-propionate etc.

(d) phosphorus-containing compound

Triphenyl phosphite, diphenyl decyl phosphite ester, phenyl isodecyl phosphite ester, tricresyl phosphite (nonyl phenyl) ester, 4,4 '-butylidene-two (3-methyl-6-tert butyl phenyl-two (tridecyl) phosphite esters), diphosphorous acid distearyl pentaerythritol ester, three sulfo-tricresyl phosphite Lauryl Ester etc.

(plastifier)

The suitable manufacturing methods that is used for photoreceptor layers comprises following compounds, but is not limited in this.

(a) phosphate

Triphenyl phosphate, tricresyl phosphate, trioctyl phosphate, octyl diphenyl phosphate, trichloroethyl phosphate, tricresyl phosphate base diphenyl ester, tributyl phosphate, tri-2-ethylhexyl phosphate, triphenyl phosphate etc.

(b) phthalic ester

Repefral, diethyl phthalate, diisobutyl phthalate, dibutyl phthalate, dibutyl phthalate (DHP), di-2-ethylhexyl phthalate, diisooctyl phthalate, di-n-octyl phthalate, dinonyl phthalate, diisononyl phthalate, diisooctyl phthalate, two 11 esters of phthalic acid, phthalic acid double tridecyl ester, dicyclohexyl phthalate, butyl benzene methylphthalic acid ester, butyl dodecyl phthalic ester, methyl oil base phthalic ester, the octyl-decyl phthalic ester, dibutyl fumarate, dioctyl fumarate etc.

(c) aromatic carboxylic acid ester

Trioctyl trimellitate, tri trimellitate-n-octyl ester, octyloxy benzoic ether etc.

(d) binary fatty acid ester

Dibutyl adipate, di-n-hexyl adipate, hexane diacid two-2-ethylhexyl, di n octyl adipate, the positive decyl adipate of n-octyl, diisodecyl adipate (DIDA), dioctyl adipate, azelaic acid two-2-ethylhexyl, dimethyl sebacate, diethyl sebacate, dibutyl sebacate, dioctyl sebacate, decanedioic acid two (2-ethylhexyl) ester, decanedioic acid two-2-ethoxyethyl group ester, dioctyl succinate, succinic acid two isodecyl esters, tetrahydro-2-ethylhexyl phthalate, di-n-octyl tetrahydrophthalate etc.

(e) aliphatic ester derivatives

Butyl oleate, glycerine monooleate, acetyl group castor oil acid methyl esters, pentaerythritol ester, dipentaerythritol six esters, glycerol triacetate, glycerin tributyrate etc.

(f) esters of oxyacids

Acetyl group castor oil acid methyl esters, acetyl group castor oil acid butyl ester, Glycolic acid butyl phthalyl butyl ester, tributyl 2-acetylcitrate etc.

(g) epoxy compound

Epoxidized soybean oil, epoxy linseed oil, butyl epoxy stearate, epoxystearic acid ester in the last of the ten Heavenly stems, octyl epoxy stearate, epoxystearic acid benzene methyl, epoxy di-2-ethylhexyl hexahydrophthalate, epoxy hexahydrophthalic acid didecyl ester etc.

(h) binary alcohol esters

Dibenzoic diglycol laurate, triethylene glycol two-2 Ethylbutanoic acid ester etc.

(i) chlorine-containing compound

The methyl esters of the methyl esters of chlorinated paraffin, chlorinated biphenyl, chlorination fatty acid, methoxyl chlorination fatty acid etc.

(j) petchem

The inferior propyl ester of poly-hexane diacid, polypropylene sebacate, acetylation polyester etc.

(k) sulfonic acid

Para toluene sulfonamide, orthotoluene sulfonamide, p-methylphenyl sulfone buserelin (sulfoneethylamide), o-tolyl sulfone buserelin, toluene sulfone-N-buserelin, to toluene sulfone-N-cyclohexyl amide etc.

(l) citric acid derivant

Triethyl citrate, acetyl triethyl citrate, tributyl citrate, tributyl 2-acetylcitrate, three-2-ethylhexyl acetyl citrate, n-octyl decyl acetyl citrate etc.

(m) other compound

Terphenyl, partially hydrated terphenyl, camphor, 2 nitro biphenyl, dinonyl naphthalene, methyl abietate etc.

(ultraviolet light absorber)

The suitable ultraviolet light absorber that is used for the layer of photoreceptor comprises following compounds, but is not limited in this.

(a) benzophenone cpd

2-dihydroxy benaophenonel, 2,4 dihydroxy benzophenone, 2,2 ', 4-trihydroxybenzophenone, 2,2 ', 4,4 '-tetrahydroxybenzophenone, 2,2 '-dihydroxy-4-methoxy benzophenone etc.

(b) salicylate compound

Phenyl salicytate, 2,4-two-tert-butyl-phenyl-1-3,5-two-tertiary butyl-4-hydroxy benzoic ether etc.

(c) benzotriazole cpd

(2 '-hydroxyphenyl) benzotriazole, (2 '-hydroxyl-5 '-tolyl) benzotriazole, (2 '-hydroxyl-3 '-tert-butyl group-5 '-aminomethyl phenyl)-the 5-chlorobenzotriazole etc.

(d) alpha-cyanoacrylate ester compounds

Ethyl-2-cyano group-3,3-biphenyl acrylate, methyl-2-carbomethoxy-3-(to methoxyl) acrylate etc.

(e) quencher (metal complex)

(2,2 '-thiobis (uncle's 4-octyl group) phenolization)-n-butylamine nickel, nickel dibutyl dithiocarbamate, dicyclohexyl phosphordithiic acid cobalt etc.

(f) HALS (bulky amine)

Two (2,2,6,6-tetramethyl-4-piperidyl) sebacate, two (1,2,2,6,6-pentamethyl-4-piperidyl) sebacate, 1-[2-{3-(3,5-two-tert-butyl group-4-hydroxyphenyl) propionyloxy } ethyl]-4-{3-(3,5-di-t-butyl-4-hydroxyphenyl) propionyloxy } 2,2,6,6-tetramethyl pyridine, 8-benzyl-7,7,9,9-tetramethyl-3-octyl group-1,3,8-thriazaspiro [4,5] undecane-2,4-diketone, 4 benzoic acid base-2,2,6,6-tetramethyl piperidine etc.

The above-mentioned low-molecular-weight CTM that is used for CGL102 that mentions can also be used for each layer of photoreceptor of the present invention.

Embodiment

Embodiment 1

＜formation photoreceptor 〉

Preparation has primer-layer-coated liquid, CGL applying liquid and the CTL applying liquid of following composition.

Primer-layer-coated liquid

9 parts of alkyd resin

(available from Dainippon Ink ﹠amp; Chemicals, the BEKKOZOL M-6301-45 of Inc.)

7 parts of melamine resins

(available from Dainippon Ink ﹠amp; Chemicals, the SUPER BEKKAMIN G-821-60 of Inc.)

40 parts of titania

(available from the CR-EL of Ishihara sangyo Kaisha Ltd.)

150 parts of methyl ethyl ketones

The CGL applying liquid

5.2 parts of disazo pigments with following formula (M)

0.25 part of polyvinyl butyral

(available from the XYHL of Union Carbide Corp.)

200 parts of cyclohexanone

80 parts of methyl ethyl ketones

The CTL applying liquid

7 parts of CTM with following general formula

10 parts of Z-shape polycarbonate resins

(viscosity average molecular weigh is 52,000, available from Teijin Chemicals Ltd.)

85 parts of tetrahydrofurans

1 part of 1% silicone oil tetrahydrofuran solution

(silicone oil: KF50-100CS is available from Shin-Etsu Chemical Industry Co., Ltd.)

Be to apply above-mentioned primer-layer-coated liquid on the aluminum cylinder of 30mm at diameter, CGL applying liquid and CTL applying liquid, and form thereon by the immersion coating method, dry then.

The control ascending velocity makes that the thickness that forms undercoat is 4.5 μ m, form CGL and make that undercoat and CGL are 17.5% to the reflectivity of wavelength 720nm, and the thickness of the CTL that forms is 31 μ m, wherein, 720nm be when with spectrophotometric tintmeter (the spectrophotometer CM-2500D that makes by KONICA Minolta Holdings Inc.) when measuring in the 360nm-740nm scope for the highest wavelength of reflectivity of undercoat and charge generation layer.

＜assessment 〉

The photoreceptor ornamenting (finish) of preparation thus is used for practical application, then it is packed into and write the IPSIO COLOR 8100 of wavelength (by Rlcoh Co. based on having 655nm LD, the Ltd manufacturing) in the electro-photography apparatus of transforming, carry out service test, wherein with 5% image area than producing 30,000 parts of duplicates that contain the image of rectangular solid (solid) image and character.So carry out embodiment 1-4 and comparative example 1-4.

The mean grain size of used toner is 5.9 μ m.

The charger that is used for electro-photography apparatus is the short distance charging roller of photoreceptor.

Charge condition is as follows:

AC portion voltage: 1.9kV (peak value is to the voltage of peak value)

AC portion frequency: 1.35KHz

The voltage of DC component: the control DC voltage makes that in service test was carried out, the electromotive force of the photoreceptor of charging remained on-500V.Do not provide quencher to this electronic photographing device.

In addition, other condition is as follows:

Development bias voltage :-350V

Environmental baseline: 24 ℃, 54%RH

When finishing this service test, afterimage and other picture quality are assessed.

The image that visual observations produced determines whether it has afterimage.Image is carried out following classification.

Class 5: it is excellent not observe afterimage

Class 4: it is almost excellent to observe few afterimage

Grade 3: it is almost good to observe a spot of afterimage

Grade 2: it is almost out of question to observe some afterimages

Grade 1: it is poor to observe considerable afterimage and be difficult to identification

Other image quality of assessment is background contamination, image density etc.

Assessment result is shown in table 1.

Embodiment 2

Except the CTL thickness that forms is 20 μ m, use the method identical to prepare the Electrophtography photosensor of embodiment 2 with embodiment 1.

Use the mode identical to assess the Electrophtography photosensor of preparation like this with embodiment 1.

Assessment result is shown in table 1.

Embodiment 3

Except the CTL thickness that forms is 33 μ m, use the method identical to prepare the Electrophtography photosensor of embodiment 3 with embodiment 1.

Use the mode identical to assess the Electrophtography photosensor of preparation like this with embodiment 1.

Assessment result is shown in table 1.

Embodiment 4

Except the CTL thickness that forms is 16 μ m, use the method identical to prepare the Electrophtography photosensor of embodiment 4 with embodiment 1.

Use the mode identical to assess the Electrophtography photosensor of preparation like this with embodiment 1.

Assessment result is shown in table 1.

Embodiment 5

The reflectivity of undercoat and CGL is 18.5% when using spectrophotometric tintmeter to be determined at the 720nm wavelength, uses the method identical with embodiment 1 to prepare the Electrophtography photosensor of embodiment 5.

Assessment result is shown in table 1

Embodiment 6

The reflectivity of undercoat and CGL is 16.7% when using spectrophotometric tintmeter to be determined at the 720nm wavelength, uses the method identical with embodiment 1 to prepare the Electrophtography photosensor of embodiment 6.

Assessment result is shown in table 1

Embodiment 7

The reflectivity of undercoat and CGL is 19.4% when using spectrophotometric tintmeter to be determined at the 720nm wavelength, uses the method identical with embodiment 1 to prepare the Electrophtography photosensor of embodiment 7.

Embodiment 8

The reflectivity of undercoat and CGL is 20.5% when using spectrophotometric tintmeter to be determined at the 720nm wavelength, uses the method identical with embodiment 1 to prepare the Electrophtography photosensor of embodiment 6.

The comparative example 1

Except using 4 weight portion Y shape titanyl phthalocyanines to replace disazo pigment to be used for preparing the CGL applying liquid of embodiment 1, use the method identical to prepare comparative example 1 Electrophtography photosensor with embodiment 1.

Use the mode identical to assess the Electrophtography photosensor of preparation like this with embodiment 1.

Assessment result is shown in table 1.

The comparative example 2

After forming undercoat and CGL, the reflectivity of being measured when the 720nm wavelength by spectrophotometric tintmeter is outside 13.4%, uses the method identical with embodiment 1 to prepare comparative example 2 Electrophtography photosensor.

Use the mode identical to assess the Electrophtography photosensor of preparation like this with embodiment 1.

Assessment result is shown in table 1.

The comparative example 3

After forming undercoat and CGL, the reflectivity of being measured at wavelength 720nm by spectrophotometric tintmeter is outside 22.8%, uses the method identical with embodiment 1 to prepare comparative example 3 Electrophtography photosensor.

Use the mode identical to assess the Electrophtography photosensor of preparation like this with embodiment 1.

Assessment result is shown in table 1.

The comparative example 4

Except the CTL thickness that forms is 13 μ m, use the method identical to prepare comparative example 4 Electrophtography photosensor with embodiment 1.

Use the mode identical to assess the Electrophtography photosensor of preparation like this with embodiment 1.

Assessment result is shown in table 1.

The comparative example 5

The reflectivity of undercoat and CGL is 14.6% when using spectrophotometric tintmeter to measure wavelength as 720nm, uses the method identical with embodiment 1 to prepare comparative example 5 Electrophtography photosensor.

Assessment result is shown in table 1.

The comparative example 6

The reflectivity of undercoat and CGL is 21.4% when using spectrophotometric tintmeter to measure wavelength as 720nm, uses the method identical with embodiment 1 to prepare comparative example 6 Electrophtography photosensor.

Assessment result is shown in table 1.

Table 1

	Electric field intensity (V/ μ m)	The reflectivity of undercoat+CGL		Afterimage assessment (grade)	The perverted image quality
						Measure the wavelength of reflectivity	?????％
		Embodiment 1	????16.1					????720nm	????17.5	????5	Do not have
Embodiment 2	????25.0			????720nm	????17.5	????5	Do not have
		Embodiment 3	????15.1					????720nm	????17.5	????5	Do not have
Embodiment 4	????31.3			????720nm	????17.5	????5	Do not have
		Embodiment 5	????16.1					????720nm	????18.5	????5	Do not have
Embodiment 6	????16.1			????720nm	????16.7	????4	Do not have
		Embodiment 7	????16.1					????720nm	????19.4	????4	Do not have
Embodiment 8	????16.1			????720nm	????20.5	????4	Do not have
		The comparative example 1	????16.1					????720nm	????17.5	????1	Afterimage
The comparative example 2	????16.1			????720nm	????13.4	????1	Afterimage
		The comparative example 3	????16.1					?????720nm	????22.8	????1	Afterimage
The comparative example 4	????38.5			????720nm	????17.5	????2	Image density reduces
		The comparative example 5	????16.1					????720nm	????14.6	????2	Afterimage
The comparative example 6	????16.1			????720nm	????21.4	????2	Afterimage

As shown in table 1, in satisfying the embodiment of requirement of the present invention, obtained not have residual and qualitative picture perverted image.On the contrary, do not satisfy among the comparative example of requirement of the present invention, observe for example image that reduces of afterimage and density of image of unusual image at each.

Embodiment 9

The photoreceptor ornamenting of embodiment 1 is used for practical application, the electro-photography apparatus of transforming based on IMAGIO NEO270 (being made by Ricoh Co.Ltd.) of packing into then carries out service test, transforming the feasible wavelength that is used for the light source of image irradiation of this device is 655nm and the LED irradiation unit of having removed the quencher effect, wherein with 5% image area than producing 20,000 parts of duplicates that contain the image of rectangular solid image and character.Carry out embodiment 9 like this.

The toner and the developing apparatus that use are the toner and the developing apparatus of IMAGIO NEO 270 special uses.

The charger that is used for electro-photography apparatus is the short distance charging roller of photoreceptor.

Use the charge condition of external power source as follows:

AC portion voltage: 1.9kV (peak value is to the voltage of peak value)

AC portion frequency: 1.35KHz

The voltage of DC component: the control DC voltage makes the electromotive force of the photoreceptor that charges in the service test remain on-700V.

In addition, other condition is as follows:

Development bias voltage :-500V

Environmental baseline: 24 ℃ of 54%RH

When complete operation is tested, afterimage and other picture quality are assessed.

Assessment result is shown in table 2.

Embodiment 10

With the method identical the Electrophtography photosensor of embodiment 2 is tested with embodiment 9.So carry out embodiment 10.Assessment result is shown in table 2.

Embodiment 11 to 15

With the method identical the Electrophtography photosensor of embodiment 3,5 to 8 is tested with embodiment 9.So carry out embodiment 11 to 15.Assessment result is shown in table 2.

The comparative example 7 to 12

With the method identical comparative example 1 to 6 Electrophtography photosensor is tested with embodiment 9.So compare embodiment 7 to 12.Assessment result is shown in table 2.

Table 2

	Electric field intensity (V/ μ m)	The reflectivity of undercoat+CGL		Afterimage assessment (grade)	The perverted image quality
						Measure the wavelength of reflectivity	?????％
		Embodiment 9	????22.6					????720nm	????17.5	????5	Do not have
Embodiment 10	????35.0			????720nm	????17.5	????4	Do not have
		Embodiment 11	????21.2					????720nm	????17.5	????5	Do not have
Embodiment 12	????22.6			????720nm	????18.5	????5	Do not have
		Embodiment 13	????22.6					????720nm	????16.7	????3	Do not have
Embodiment 14	????22.6			????720nm	????19.4	????3	Do not have
		Embodiment 15	????22.6					????720nm	????20.5	????3	Do not have
The comparative example 7	????22.6			????720nm	????17.5	????1	Afterimage
		The comparative example 8	????22.6					????720nm	????13.5	????1	Afterimage
The comparative example 9	????22.6			????720nm	????22.8	????1	Afterimage
		The comparative example 10	????53.8					????720nm	????17.5	????1	Afterimage, background contamination, image density reduce
The comparative example 11	????22.6			????720nm	????14.6	????2	Afterimage
		The comparative example 12	????22.6					????720nm	????21.4	????2	Afterimage

As shown in table 2, in satisfying the embodiment of requirement of the present invention, obtained not have residual and qualitative picture perverted image.On the contrary, do not satisfy among the comparative example of requirement of the present invention, observe for example image that reduces of afterimage, background contamination and density of image of unusual image at each.

Embodiment 16

＜formation photoreceptor 〉

Preparation has primer-layer-coated liquid, CGL applying liquid and the CTL applying liquid of following composition.

Primer-layer-coated liquid

9 parts of alkyd resin

(BEKKOZOL 1307-60-EL is available from Dainippon Ink ﹠amp; Chemicals, Inc.)

7 parts of melamine resins

(SUPER BEKKAMIN G-821-60 is available from Dainippon Ink ﹠amp; Chemicals, Inc.)

40 parts of titania

(CR-EL is available from Ishihara Sangyo Kaisha Ltd.)

150 parts of methyl ethyl ketones

The CGL applying liquid

4 parts of disazo pigments with following general formula (M)

0.25 part of polyvinyl butyral

(XYHL is available from Union Carbide Corp.)

200 parts of cyclohexanone

80 parts of methyl ethyl ketones

The CTL applying liquid

CTM:7 part with following formula

10 parts of Z-shape polycarbonate resins

(viscosity average molecular weigh is 50,000, available from Teijin Chemicals Ltd.)

85 parts of tetrahydrofurans

1 part of 1% silicone oil tetrahydrofuran solution

(silicone oil: KF50-100CS is available from Shin-Etsu Chemical Industry Co.Ltd.)

Be to apply above-mentioned primer-layer-coated liquid, CGL applying liquid and CTL applying liquid and form dry then by the immersion coating method on the aluminum cylinder of 30mm at diameter.

The primer thickness that the control ascending velocity make to form is 4.5 μ m, form CGL and make at wavelength to be that transmittance T (%) is 45% under the light source of 655nm, and the CTL thickness that forms is 31 μ m.

＜assessment 〉

The photoreceptor of preparation thus such as embodiment 1 are carried out ornamenting to be used for practical application and to assess.

Assessment result is shown in table 3.

Embodiment 17

Except the CTL thickness that forms is 20 μ m, use the method identical to prepare the Electrophtography photosensor of embodiment 17 with embodiment 16.

Use the mode identical to assess the Electrophtography photosensor of preparation like this with embodiment 16.

Assessment result is shown in table 3.

Embodiment 18

Except the CTL thickness that forms is 33 μ m, use the method identical to prepare the Electrophtography photosensor of embodiment 18 with embodiment 16.

Use the mode identical to assess the Electrophtography photosensor of preparation like this with embodiment 16.

Assessment result is shown in table 3.

Embodiment 19

Except the CTL thickness that forms is 16 μ m, use the method identical to prepare the Electrophtography photosensor of embodiment 19 with embodiment 16.

Use the mode identical to assess the Electrophtography photosensor of preparation like this with embodiment 16.

Assessment result is shown in table 3.

Embodiment 20

Except being the light source of 655nm for wavelength, the transmittance T (%) of CGL is 36%, uses the method identical with embodiment 16 to prepare the Electrophtography photosensor of embodiment 20.

Use the mode identical to assess the Electrophtography photosensor of such preparation with embodiment 16.

Assessment result is shown in table 3.

Embodiment 21

Except being the light source of 655nm for wavelength, the transmittance T (%) of CGL is 39.2%, uses the method identical with embodiment 16 to prepare the Electrophtography photosensor of embodiment 21.

Use the mode identical to assess the Electrophtography photosensor of such preparation with embodiment 16.

Assessment result is shown in table 3.

Embodiment 22

Except being the light source of 655nm for wavelength, the transmittance T (%) of CGL is 41%, uses the method identical with embodiment 16 to prepare the Electrophtography photosensor of embodiment 22.

Use the mode identical to assess the Electrophtography photosensor of such preparation with embodiment 16.

Assessment result is shown in table 3.

Embodiment 23

Except being the light source of 655nm for wavelength, the transmittance T (%) of CGL is 54.1%, uses the method identical with embodiment 16 to prepare the Electrophtography photosensor of embodiment 23.

Use the mode identical to assess the Electrophtography photosensor of such preparation with embodiment 16.

Assessment result is shown in table 3.

Embodiment 24

Except being the light source of 655nm for wavelength, the transmittance T (%) of CGL is 55.6%, uses the method identical with embodiment 16 to prepare the Electrophtography photosensor of embodiment 24.

Use the mode identical to assess the Electrophtography photosensor of such preparation with embodiment 16.

Assessment result is shown in table 3.

Embodiment 25

Use the method identical with embodiment 16 to prepare the Electrophtography photosensor of embodiment 25, except being the light source of 655nm for wavelength, the transmittance T (%) of CGL is 64.3%.

Use the mode identical to assess the Electrophtography photosensor of such preparation with embodiment 16.

Assessment result is shown in table 3.

The comparative example 13

Except the Y shape titanyl phthalocyanine that uses 4 weight portions replaces being used for preparing the disazo pigment of embodiment 16 CGL applying liquids, use the method identical to prepare comparative example 13 Electrophtography photosensor with embodiment 16.

Use the mode identical to assess the Electrophtography photosensor of preparation like this with embodiment 16.

Assessment result is shown in table 3.

The comparative example 14

Except being the light source of 655nm for wavelength, the transmittance T (%) of CGL is 28%, uses the method identical with embodiment 16 to prepare comparative example 14 Electrophtography photosensor.

Use the mode identical to assess the Electrophtography photosensor of preparation like this with embodiment 16.

Assessment result is shown in table 3.

The comparative example 15

Except being the light source of 655nm for wavelength, the transmittance T (%) of CGL is 70%, uses the method identical with embodiment 16 to prepare comparative example 15 Electrophtography photosensor.

Use the mode identical to assess the Electrophtography photosensor of preparation like this with embodiment 16.

Assessment result is shown in table 3.

The comparative example 16

Except the CTL thickness that forms is 13 μ m, use the method identical to prepare comparative example 16 Electrophtography photosensor with embodiment 16.

Use the mode identical to assess the Electrophtography photosensor of preparation like this with embodiment 16.

Assessment result is shown in table 3.

The comparative example 17

Except being the 655nm light source for wavelength, the transmittance T (%) of CGL is 34.5%, uses the method identical with embodiment 16 to prepare comparative example 17 Electrophtography photosensor.

Use the mode identical to assess the Electrophtography photosensor of preparation like this with embodiment 16.

Assessment result is shown in table 3.

The comparative example 18

Except being the 655nm light source for wavelength, the transmittance T (%) of CGL is 66%, uses the method identical with embodiment 16 to prepare comparative example 18 Electrophtography photosensor.

Use the mode identical to assess the Electrophtography photosensor of preparation like this with embodiment 16.

Assessment result is shown in table 3.

Table 3

	Electric field intensity (V/ μ m)	The transmittance of CGL		Afterimage assessment (grade)	The perverted image quality
						Write wavelength	????％
		Embodiment 16	??16.1					????655nm	????45	????5	Do not have
Embodiment 17	??25.0			????655nm	????45	????5	Do not have
		Embodiment 18	??15.1					????655nm	????45	????5	Do not have
Embodiment 19	??31.3			????655nm	????45	????5	Do not have
		Embodiment 20	??16.1					????655nm	????36	????3	Do not have
Embodiment 21	??16.1			????655nm	????39.2	????4	Do not have
		Embodiment 22	??16.1					????655nm	????41	????5	Do not have
Embodiment 23	??16.1			????655nm	????54.1	????5	Do not have
		Embodiment 24	??16.1					????655nm	????55.6	????4	Do not have
Embodiment 25	??16.1			????655nm	????64.3	????3	Do not have
		The comparative example 13	??16.1					????655nm	????45	????1	Afterimage
The comparative example 14	??16.1			????655nm	????28	????1	Afterimage
		The comparative example 15	??16.1					????655nm	????70	????1	Afterimage
The comparative example 16	??38.5			????655nm	????45	????2	Image density reduces
		The comparative example 17	??16.1					????655nm	????34.5	????2	Afterimage
The comparative example 18	??16.1			????655nm	????66	????2	Afterimage

As shown in table 3, in satisfying the embodiment of requirement of the present invention, obtained not have residual and qualitative picture perverted image.On the contrary, do not satisfy among the comparative example of requirement of the present invention, observe for example image that reduces of afterimage and density of image of unusual image at each.

Embodiment 26

The photoreceptor ornamenting of embodiment 16 is used for practical application, then with embodiment 9 the same assessments.So carry out embodiment 26.

Assessment result is shown in table 4.

Embodiment 27 to 34

With the method identical the Electrophtography photosensor of embodiment 17,18 and 20 to 25 is tested with embodiment 26.So carry out embodiment 27 to 34.Table 4 display result.

Comparative example 19-24

With the method identical the Electrophtography photosensor of comparative example 13-18 is tested with embodiment 26.So implement comparative example 19-24.Assessment result is shown in table 4.

Table 4

	Electric field intensity (V/ μ m)	The transmittance of CGL		Afterimage assessment (grade)	The perverted image quality
						Write wavelength	????％
		Embodiment 26	??22.6					??655nm	????45	????5	Do not have
Embodiment 27	??35.0			??655nm	????45	????5	Do not have
		Embodiment 28	??21.2					??655nm	????45	????5	Do not have
Embodiment 29	??22.6			??655nm	????36	????3	Do not have
		Embodiment 30	??22.6					??655nm	????39.2	????4	Do not have
Embodiment 31	??22.6			??655nm	????41	????5	Do not have
		Embodiment 32	??22.6					??655nm	????54.1	????5	Do not have
Embodiment 33	??22.6			??655nm	????55.6	????4	Do not have
		Embodiment 34	??22.6					??655nm	????64.3	????3	Do not have
The comparative example 19	??22.6			??655nm	????45	????1	Afterimage
		The comparative example 20	??22.6					??655nm	????28	????1	Afterimage
The comparative example 21	??22.6			??655nm	????70	????1	Afterimage
		The comparative example 22	??53.8					??655nm	????45	????2	Image density reduces
The comparative example 23	??22.6			??655nm	????34.5	????2	Afterimage
		The comparative example 24	??22.6					??655nm	????66	????2	Afterimage

As shown in table 4, in satisfying the embodiment of requirement of the present invention, obtained not have residual and qualitative picture perverted image.On the contrary, do not satisfy among the comparative example of requirement of the present invention, observe for example image that reduces of afterimage, background contamination and density of image of unusual image at each.

As mentioned above, since electro-photography apparatus of the present invention can produce do not have the perverted image problem as: the qualitative picture that afterimage, background contamination and density of image reduce, electro-photography apparatus of the present invention have the actual value that is used for photoprinter, facsimile recorder, laser printer, Direct Digital platemaking machine etc.

The application requires right of priority, and comprises and on September 17th, 2003 and November 20 in 2003 Japanese patent application No.2003-324986 that bu you can well imagine to be handed over and the content of 2003-391070, it is incorporated herein by reference herein.

Having described the present invention now all sidedly, is conspicuous for the person of ordinary skill of the art, promptly can carry out many changes and improvements under essence that does not break away from embodiment of the present invention and scope.

Claims (17)

1. Electrophtography photosensor, it comprises:

Conductive base;

Cover the undercoat on the conductive base;

Cover the photographic layer on the undercoat and comprise:

Cover the charge generation layer on the undercoat; With

Cover the charge transport layer on the charge generation layer,

Wherein, after undercoat and charge generation layer formed and cover on the conductive base, when using in the 360nm-740nm scope when charge generation layer had the rayed charge generation layer of maximum reflectivity, the reflectivity of this charge generation layer was 15-21%.

2. the described Electrophtography photosensor of claim 1, wherein said charge generation layer comprise the disazo pigment by following formula (I) expression:

Wherein, A and B represent the coupling agent residual groups by following formula (II) to (VIII) expression;

Wherein, X ¹Expression-OH ,-NHCOCH ₃With-NHSO ₂CH ₃, Y ¹Expression-CON (R ²) (R ³) ,-CONHN=C (R ⁶) (R ⁷) ,-CONHN (R ⁸) (R ⁹) ,-CONHCONH (R ¹²), hydrogen atom, COOH ,-COOCH ₃, COOC ₆H ₅And benzimidazolyl, wherein R ²And R ³Represent hydrogen atom, replacement or unsubstituted alkyl, replacement or unsubstituted aryl, replacement or unsubstituted heterocyclic independently, perhaps work as R ²And R ³Shi Keyu and their keys nitrogen-atoms even that combines forms ring, R ⁶And R ⁷Represent hydrogen atom, replacement or unsubstituted alkyl, replacement or unsubstituted aralkyl, replacement or unsubstituted aryl, replacement or unsubstituted styryl and replacement or unsubstituted heterocyclic independently, perhaps work as R ⁶And R ⁷Shi Keyu and their keys nitrogen-atoms even that combines forms ring, R ⁸And R ⁹Represent hydrogen atom, replacement or unsubstituted alkyl, replacement or unsubstituted aralkyl, replacement or unsubstituted aryl, replacement or unsubstituted styryl, replacement or unsubstituted heterocyclic independently, perhaps work as R ⁸And R ⁹Shi Keyu and their keys carbon atom even that combines forms optional have five yuan or the hexatomic ring that condenses aromatic rings, R ¹²Expression replacement or unsubstituted alkyl, replacement or unsubstituted aryl and replacement or unsubstituted heterocyclic, and Z represents to condense to form the aromatic ring structures that encircle or the residual base of heterocycle structure with phenyl ring more, this aromatic ring structure or heterocycle structure are selected from naphthalene nucleus, anthracene nucleus, carbazole ring, benzo carbazole ring, dibenzo-carbazole ring, dibenzofurans ring, benzo naphthols furan nucleus, dibenzothiophen ring, and each in them can have at least one substituting group;

R wherein ⁴Expression hydrogen atom, replacement or unsubstituted alkyl and replacement or unsubstituted aryl;

R wherein ⁵Expression hydrogen atom, replacement or unsubstituted alkyl and replacement or unsubstituted aryl;

Wherein Y represent divalent aromatic hydrocarbon or wherein Y with and the N atom that connects of its key form heterocyclic radical;

Wherein Y represent divalent aromatic hydrocarbon or wherein Y with and the N atom that connects of its key form heterocyclic radical;

R wherein ¹⁰Expression hydrogen atom, alkyl, carboxyl and carboxylic ester group, Ar ¹Be to replace or unsubstituted aryl; With

R wherein ¹¹Expression hydrogen atom, alkyl, carboxyl and carboxylic ester group, Ar ²Be to replace or unsubstituted aryl.

3. claim 1 or 2 described Electrophtography photosensors, wherein said charge generation layer comprise the disazo pigment by following general formula (1) expression:

4. each described Electrophtography photosensor in the claim 1 to 3, the reflectivity of wherein said charge generation layer is 17-19%.

5. electro-photography apparatus, it comprises:

Each described Electrophtography photosensor among the claim 1-4;

Be used for the charger arranged to the photosensitive surface uniform charging;

Be used for the image irradiator arranged to form electrostatic latent image thereon with the Electrophtography photosensor of rayed uniform charging;

The developing apparatus that is used to use toner to make latent electrostatic image developing and arranges;

Be used for developed image is transferred to the transfer device that receives material and arrange; With

Be used to remove the clearer that remains in any toner on the photoreceptor and arrange,

Wherein this Electrophtography photosensor satisfies following relationship:

12 (V/ μ m)≤electric field intensity (V/D)≤35 (V/ μ m),

Wherein D (μ m) represents the thickness of the charge transport layer of this Electrophtography photosensor, and V (V) expression is owing to charge the absolute potential on this Electrophtography photosensor surface.

6. the described electro-photography apparatus of claim 5, wherein said Electrophtography photosensor satisfies following relationship:

15 (V/ μ m)≤electric field intensity (V/D)≤32 (V/ μ m).

7. claim 5 or 6 described electro-photography apparatus wherein saidly are used to make the toner of latent electrostatic image developing for spherical.

8. each described electro-photography apparatus in the claim 5 to 7 also comprises:

The intermediate transfer device, wherein will on Electrophtography photosensor, be transferred to this intermediate transfer device to form overlapping color toner image thereon by a plurality of independently color toner images with independently color toner development in the first step, the independently coloured image that superposes thereon simultaneously, and overlapping color toner image is transferred to the reception material from middle transfer device in second step.

9. handle box, it comprises:

Each described Electrophtography photosensor among the claim 1-4; With following at least a:

The charger that is used to make the surperficial uniform charging of Electrophtography photosensor and arranges;

The image irradiator that is used to use the Electrophtography photosensor of rayed uniform charging to arrange to form electrostatic latent image thereon;

The developing apparatus that is used to use toner to make latent electrostatic image developing and arranges;

The image that is used for developing is transferred to the transfer device that receives material and arrange;

Be used to clean the clearer that remains in any toner on the Electrophtography photosensor and arrange; With

The quencher that is used to make the Electrophtography photosensor surface-discharge and arranges.

10. electro-photography apparatus, it comprises:

Electrophtography photosensor comprises:

Conductive base;

Cover the undercoat on the conductive base;

Cover the photographic layer on the undercoat, and comprise:

Charge generation layer, it comprises disazo pigment and is 35-65% to the transmittance in order to the light that forms electrostatic latent image on Electrophtography photosensor; With

Cover the charge transport layer on the charge generation layer;

The charger that is used to make the surperficial uniform charging of Electrophtography photosensor and arranges;

The image irradiator that is used to use the Electrophtography photosensor of rayed uniform charging to arrange to form electrostatic latent image thereon;

The developing apparatus that is used to use toner to make latent electrostatic image developing and arranges;

The image that is used for developing is transferred to the transfer device that receives material and arrange; With

Be used to clean the clearer that remains in any toner on the Electrophtography photosensor and arrange;

Wherein, described Electrophtography photosensor satisfies following relationship:

12 (V/ μ m)≤electric field intensity (V/D)≤35 (V/ μ m),

Wherein D (μ m) represents the charge transfer layer thickness of this Electrophtography photosensor, and V (V) expression is owing to charge the absolute potential on this Electrophtography photosensor surface; And

Wherein said disazo pigment is represented by following formula (I):

Wherein, A and B represent the coupling agent residual groups by following formula (II) to (VIII) expression;

Wherein, X ¹Expression-OH ,-NHCOCH ₃With-NHSO ₂CH ₃, Y ¹Expression-CON (R ²) (R ³) ,-CONHN=C (R ⁶) (R ⁷) ,-CONHN (R ⁸) (R ⁹) ,-CONHCONH (R ¹²), hydrogen atom, COOH ,-COOCH ₃, COOC ₆H ₅And benzimidazolyl, wherein R ²And R ³Represent hydrogen atom, replacement or unsubstituted alkyl, replacement or unsubstituted aryl, replacement or unsubstituted heterocyclic independently, perhaps work as R ²And R ³Shi Keyu and their keys nitrogen-atoms even that combines forms ring, R ⁶And R ⁷Represent hydrogen atom, replacement or unsubstituted alkyl, replacement or unsubstituted aralkyl, replacement or unsubstituted aryl, replacement or unsubstituted styryl and replacement or unsubstituted heterocyclic independently, perhaps work as R ⁶And R ⁷Shi Keyu and their keys nitrogen-atoms even that combines forms ring, R ⁸And R ⁹Represent hydrogen atom, replacement or unsubstituted alkyl, replacement or unsubstituted aralkyl, replacement or unsubstituted aryl, replacement or unsubstituted styryl, replacement or unsubstituted heterocyclic independently, perhaps work as R ⁸And R ⁹Shi Keyu and their keys carbon atom even that combines forms optional have five yuan or the hexatomic ring that condenses aromatic rings, R ¹²Expression replacement or unsubstituted alkyl, replacement or unsubstituted aryl and replacement or unsubstituted heterocyclic, and Z represents to condense to form the aromatic ring structures that encircle or the residual base of heterocycle structure with phenyl ring more, this aromatic ring structure or heterocycle structure are selected from naphthalene nucleus, anthracene nucleus, carbazole ring, benzo carbazole ring, dibenzo-carbazole ring, dibenzofurans ring, benzo naphthols furan nucleus, dibenzothiophen ring, and each in them can have at least one substituting group;

R wherein ⁴Expression hydrogen atom, replacement or unsubstituted alkyl and replacement or unsubstituted aryl;

R wherein ⁵Expression hydrogen atom, replacement or unsubstituted alkyl and replacement or unsubstituted aryl;

Wherein Y represent divalent aromatic hydrocarbon or wherein Y with and the N atom that connects of its key form heterocyclic radical;

Wherein Y represent bivalent aromatic hydrocarbon or wherein Y with and the N atom that connects of its key form heterocyclic radical;

R wherein ¹⁰Expression hydrogen atom, alkyl, carboxyl and carboxylic ester group, Ar ¹Be to replace or unsubstituted aryl; With

R wherein ¹¹Expression hydrogen atom, alkyl, carboxyl and carboxylic ester group, Ar ²Be to replace or unsubstituted aryl.

11. the described electro-photography apparatus of claim 10, wherein said charge generation layer comprise the disazo pigment by following formula (1) expression

12. claim 10 or 11 described electro-photography apparatus, the transmittance of wherein said charge generation layer is 40-55%.

13. each described electro-photography apparatus among the claim 10-12, wherein said Electrophtography photosensor satisfies following relationship: 15 (V/ μ m)≤electric field intensity (V/D)≤32 (V/ μ m).

14. each described electro-photography apparatus among the claim 10-13 wherein saidly is used to make the toner of latent electrostatic image developing for spherical.

15. each described electro-photography apparatus among the claim 10-14 also comprises:

The intermediate transfer device, the first step will be transferred to this intermediate transfer device to form overlapping color toner image thereon by a plurality of independently color toner images with independently color toner development on Electrophtography photosensor, the independently coloured image that superposes thereon simultaneously, and overlapping color toner image is transferred to the reception material from middle transfer device in second step.

16. a handle box, it comprises:

Electrophtography photosensor, it comprises:

Conductive base;

Cover the undercoat on the conductive base;

Cover the photographic layer on the undercoat, and comprise:

Cover the charge generation layer on the undercoat, it comprises disazo pigment and is 35-65% to the transmittance in order to the light that forms electrostatic latent image on Electrophtography photosensor;

With the charge transport layer that covers on the charge generation layer;

The image irradiator that the Electrophtography photosensor of use rayed uniform charging is arranged to form electrostatic latent image thereon; And following at least a:

The charger that is used to make the surperficial uniform charging of Electrophtography photosensor and arranges;

The developing apparatus that is used to use toner to make latent electrostatic image developing and arranges;

The image that is used for developing is transferred to the transfer device that receives material and arrange;

Be used to clean the clearer that remains in any toner on the Electrophtography photosensor and arrange;

The quencher of arranging with being used to make the Electrophtography photosensor surface-discharge;

Wherein said Electrophtography photosensor satisfies following relationship:

12 (V/ μ m)≤electric field intensity (V/D)≤35 (V/ μ m),

Wherein D (μ m) represents the charge transfer layer thickness of this Electrophtography photosensor, and V (V) expression is because the absolute potential on this Electrophtography photosensor surface of charging; And

Wherein disazo pigment is represented by following formula (I):

Wherein, A and B represent the coupling agent residual groups by following formula (II) to (VIII) expression;

Wherein, X ¹Expression-OH ,-NHCOCH ₃With-NHSO ₂CH ₃, Y ¹Expression-CON (R ²) (R ³) ,-CONHN=C (R ⁶) (R ⁷) ,-CONHN (R ⁸) (R ⁹) ,-CONHCONH (R ¹²), hydrogen atom, COOH ,-COOCH ₃, COOC ₆H ₅And benzimidazolyl, wherein R ²And R ³Represent hydrogen atom, replacement or unsubstituted alkyl, replacement or unsubstituted aryl, replacement or unsubstituted heterocycle independently, perhaps work as R ²And R ³Shi Keyu and their keys nitrogen-atoms even that combines forms ring, R ⁶And R ⁷Represent hydrogen atom, replacement or unsubstituted alkyl, replacement or unsubstituted aralkyl, replacement or unsubstituted aryl, replacement or unsubstituted styryl and replacement or unsubstituted heterocyclic independently, perhaps work as R ⁶And R ⁷Shi Keyu and their keys nitrogen-atoms even that combines forms ring, R ⁸And R ⁹Represent hydrogen atom, replacement or unsubstituted alkyl, replacement or unsubstituted aralkyl, replacement or unsubstituted aryl, replacement or unsubstituted styryl, replacement or unsubstituted heterocyclic independently, perhaps work as R ⁸And R ⁹Shi Keyu and their keys carbon atom even that combines forms optional have five yuan or the hexatomic ring that condenses aromatic rings, R ¹²Expression replacement or unsubstituted alkyl, replacement or unsubstituted aryl and replacement or unsubstituted heterocyclic, and Z represents to condense to form the aromatic ring structures that encircle or the residual base of heterocycle structure with phenyl ring more, this aromatic ring structure or heterocycle structure are selected from naphthalene nucleus, anthracene nucleus, carbazole ring, benzo carbazole ring, dibenzo-carbazole ring, dibenzofurans ring, benzo naphthols furan nucleus, dibenzothiophen ring, and each in them can have at least one substituting group;

R wherein ⁴Expression hydrogen atom, replacement or unsubstituted alkyl and replacement or unsubstituted aryl;

R wherein ⁵Expression hydrogen atom, replacement or unsubstituted alkyl and replacement or unsubstituted aryl;

Wherein Y represent divalent aromatic hydrocarbon or wherein Y with and the N atom that connects of its key form heterocyclic radical;

Wherein Y represent bivalent aromatic hydrocarbon or wherein Y with and the N atom that connects of its key form heterocyclic radical;

R wherein ¹⁰Expression hydrogen atom, alkyl, carboxyl and carboxylic ester group, Ar ¹Be to replace or unsubstituted aryl; With

R wherein ¹¹Expression hydrogen atom, alkyl, carboxyl and carboxylic ester group, Ar ²Be to replace or unsubstituted aryl.

17. a method of producing Electrophtography photosensor, it comprises:

Form conductive base;

Formation covers the undercoat on the conductive base;

Formation covers the charge generation layer on the undercoat; With

Formation covers the charge transport layer on the charge generation layer,

Wherein after undercoat and charge generation layer form and cover on the conductive base, when in using the 360nm-740nm scope charge generation layer being had the rayed charge generation layer of maximum reflectivity, the reflectivity of charge generation layer is 15-21%.

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