JPS62174771A - Electrophotographic sensitive body - Google Patents

Abstract

PURPOSE:To form a sharp image without generating the interference fringes by a semiconductor laser by providing a light absorptive layer on a base on the side opposite from a transparent electrophotographic sensitive layer provided on the transparent conductive base. CONSTITUTION:A transparent thermoplastic resin film consisting of polyester, polycarbonate, etc., is subjected to an electrical conducting treatment by vapor deposition of a metal such as Al, Au, Pd, or In or oxide such as In2O5 or SnO2. A transparent org. photoconductive layer is provided on the surface of the conductive base. The light absorptive layer is provided on the rear surface of such base, by which the generation of the interference fringes generated in the stage of recording the image by using the semiconductor laser is prevented. Dyes having absorption to near IR light (e.g., a cyanine dye, methine dye, naphthoquinone dye, etc.) are used for the light absorptive layer.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a translucent electrophotographic photoreceptor suitable for producing microfilms and the like. In particular, the present invention relates to a translucent electrophotographic photoreceptor suitable for recording using a semiconductor laser.

[Conventional technology]

A method of forming an image using electrophotography includes a method of forming a toner image on an electrophotographic photoreceptor such as a selenium drum and then transferring it to plain paper, and a method of forming a photoconductor layer on a support such as paper or film. A method of forming a toner image on a recording material provided with a toner image is widely used.

Recently, as a special application of this method, an electrophotographic photoreceptor in which a transparent organic photoconductor layer is provided on a transparent conductive support has been developed as a recording material in fields such as microfilm. (For example, “0ptical Eng”, Vo
120, A3, 365 (1981).

Patent Application No. 59-95270, etc.). In this method,
A toner image is electrophotographically formed on the translucent electrophotographic photoreceptor, and when necessary, this recorded image is observed (enlarged projection or copying) using transmitted light.

On the other hand, recently, an electrophotographic system using a semiconductor laser as a light source has been developed. Semiconductor laser is Be-Ne
It has major advantages such as being smaller, lower cost, and capable of direct modulation than other gas lasers.

[Problem that the invention seeks to solve]

However, when such a semiconductor laser is used as a recording light source for the translucent electrophotographic photoreceptor, interference fringes may appear on the surface of the photoreceptor. E-position unevenness occurs, which causes density unevenness when an electrostatic latent image is developed with toner. In order to prevent the occurrence of similar interference fringes in electrophotographic photoreceptors for laser beam printers using opaque supports, conductive supports with roughened surfaces are used (Japanese Patent Application Laid-Open No. 1983-1999).
No. 162975, JP-A-58-171057.

(Japanese Unexamined Patent Publication No. 60-112049) A subbing layer having a rough surface with no gloss is provided between the conductive support and the photosensitive layer (Japanese Unexamined Patent Publication No. 60-172047) It has been proposed to provide a titanium black dispersion subbing layer between the body and the photosensitive layer (Japanese Patent Laid-Open No. 60-184).
258 Publication). However, even if such a subbing layer is provided between the conductive layer of the transparent photoreceptor and the conductive support, not only a satisfactory effect cannot be obtained, but also the dispersion of titanium black etc. The presence of the layer hinders reading out the recorded image with transmitted light.

[Failure to solve the problem]

As a result of various studies by the present inventors regarding the above-mentioned causes, we found that most semiconductor lasers have wavelengths in the near-infrared region of 750 nm or more, and are coherent light. When the electrophotographic photosensitive layer (electrophotographic photosensitive layer and conductive support) is thick enough to be used as a recording material such as a microfilm, the laser light that enters the photoreceptor during recording is mainly reflected on the back surface of the support. It was discovered that this reflected light interferes with the incident light on the surface of the photosensitive book, resulting in interference fringes as described above, and by providing a light absorbing layer as an antireflection layer on the back side of the support, the above drawback can be overcome. The present invention was achieved based on this discovery.

Therefore, an object of the present invention is to record r
The object of the present invention is to provide a suitable light-transmitting electrophotographic photoreceptor.

In particular, an object of the present invention is to provide a translucent electrophotographic photoreceptor that can form sharp images without producing interference fringes during recording with a semiconductor laser.

That is, the present invention provides an electrophotographic photoreceptor having a transparent electrophotographic photosensitive layer on a transparent conductive support, in which a light absorption layer is provided on the transparent conductive support on the side opposite to the photosensitive layer. This is a characteristic electrophotographic photoreceptor.

The present invention will be explained in detail below.

Transparent conductive supports used in the present invention include polyester, polycarbonate, boriamy, acrylic resin,
A film made of a transparent thermoplastic resin such as polyamide P, polystyrene, polyacetal, or polyolefin that has been subjected to conductive treatment is used.

Specific conductive treatments include a method of vapor-depositing metals such as aluminum, gold, varaginium, and indinium, a method of vapor-depositing metal oxides such as In 20 s and SnO□, or a method of vapor-depositing metal powder, SnO 2, etc. metal oxides, etc./
Examples include a method of dispersing and applying an organic quaternary salt compound in an under polymer, a method of dissolving an organic quaternary salt compound together with an under polymer, and a method of applying a solution of copper iodide in acetonitrile.

As the electrophotographic photosensitive layer used in the present invention, an organic photoconductive layer made of an organic photoconductive substance is used, and after forming a toner image on the surface of the conductive layer, the layer is transparent to the extent that it does not interfere with reading the recorded image with transmitted light. It is necessary to have gender.

As the organic photoconductive material used in the electrophotographic photoreceptor of the present invention, many conventionally known materials can be used.

Examples of polymers include the following:

(1) U.S. Patent No. 3,037,861, Japanese Patent Publication No. 34-10966, Japanese Patent Publication No. 42-19751,
2-rivinylcarmazole and derivatives thereof described in Publication No. 42-25230, (2) Japanese Patent Publication No. 43-186
Polyvinylpyrene, polyvinylanthrace/, poly-2-vinyl-4-(4'-dimethylaminophenyl)-5-phenyl-oxasol, poly-3-vinyl-N as described in Publication No. 74 and Japanese Patent Publication No. 43-19192 -Vinyl polymers such as ethylcal/etc pool, (3) Special Publication Publication No. 1973
- Polymers such as polyacenaphthylene, boriindene, copolymer of acenaphthylene and styrene, etc. described in Japanese Patent Publication No. 19193, (4) Japanese Patent Publication No. 13940/1983, etc.
Condensation resins such as birene-formaldehy resin, propylene-formaldehy resin, and ethylcal/sole-formaldehy resin, (5) JP-A-56-90883 and JP-A-56-16
Various triphenylmethane birimers described in Publication No. 1550.

In addition, the following can be mentioned as low molecular weight compounds.

(6) Triazole derivatives described in US Pat. No. 3,112,197, etc.; (7) Oxadiazole derivatives, described in US Pat. No. 3,189,447, etc.;
Imidazole derivatives described in Publication No. 16096, etc. (9) U.S. Patent No. 3615402, U.S. Patent No. 382098
No. 9, No. 3542544, Special Publication No. 45-555, No. 10983-1983, Japanese Patent Publication No. 93224-1971,
JP-A-55-17105, JP-A-56-4148,
JP-A-55-108667, JP-A-55-15695
Polyarylalkane derivatives α [US Pat. No. 3,180,729, US Pat. No. 4,278
No. 746, JP-A-55-88064, JP-A-55-8
No. 8065, JP-A-49-105537, JP-A-55
-51086, JP-A-56-80051, JP-A-5
6-88141, JP-A-57-45545, JP-A-5
Pyrazoline derivatives and pyrazolone derivatives described in No. 4-112637, Japanese Unexamined Patent Publication No. 55-74546, publications, etc.;
-10105, JP-A No. 54-83435, JP-A-Sho 5
4-110836, JP-A-54-119925, JP-B-46-3712, JP-A-47-28336 specification, gazette, etc., U.S. Pat. No. 3,567,450, JP-A-49・35
No. 702, West German Patent (DSA) 111051
No. 8, U.S. Patent No. 3180703, U.S. Patent No. 324
No. 0597, US Pat. No. 3,658,520, US Pat. No. 4,232,103, US Pat. No. 4,175,961, US Pat.
No. 7, realamine derivatives described in JP-A-5-6-22437, publications, etc., 03) Amino-substituted chalcone derivatives described in U.S. Pat. No. 3,526,501, (14) U.S. Pat. No. 3,542,546 Saimei #I, etc., N,N-bical--N-cyclo derivatives, (19) oxazole derivatives, described in U.S. Pat. No. 3,257,203, etc.; Lylanthracene derivatives, surface Fluorenone derivatives, α, described in JP-A-54-110837, etc. U.S. Pat. No. 3,717,462, JP-A-54-59
No. 143 (corresponding to U.S. Pat. No. 4,150,987), JP-A-55-52063, JP-A-55-52064, JP-A-55-46760, JP-A-55-85495,
JP-A-57-11350, JP-A-57-148749
No., JP-A No. 57-64244, gazettes, etc., a9% hi-lazone derivatives, JP-A No. 39-11546, JP-A No. 55-79
450 (corresponding to U.S. Pat. No. 4,265,990), and U.S. Pat. No. 4,047,949, there are benzene and zine derivatives.

When the organic photoconductor is a low-molecular compound, a high-molecular compound having suitable film properties can be used as a binder. Specifically, polyamide P, polyurethane, polyester, epoxy resin, polyketone, styrenic polymer and copolymer, poly N-vinylcarnosol, polycarzenate, polyester carzenate, polysulfone, vinyl chloride 4i [L vinylidene chloride] Examples include various polymer compounds such as resins, vinyl acetate resins, and acrylic resins. When the organic photoconductor is a polymer compound, it itself has film properties, but the above-mentioned polymer compound may be added as necessary.

Since the photoreceptor used in the present invention performs recording using a semiconductor laser as a light source, it is necessary for the organic photoconductive layer to have main absorption in the near-infrared region of 750 nm or more and to exhibit high sensitivity in the near-infrared region. There is. Various sensitizing agents can be used for this purpose. For example, U.S. Patent No. 3,88
Substituted arylbenzo(thio) described in No. 1,924
Pyrylium salt, trinotine thiapyrylium salt described in JP-A-57-142654 (US Patent No. 4,327,169), JP-A-58-181051, 58-2201
No. 43, No. 59-41363, No. 59-84248, 5
No. 9-84249, No. 59-146063, 59-14
Examples include the pyridium compound described in No. 6061, the cyanine dye described in JP-A-59-216146, and the like. In particular, the patent application filed in 1986-21, which was developed by the applicant earlier.
It is preferable to use a combination of a biryllium-based compound and an ami-P compound as described in US Pat. No. 3197, or a bentamethine thiopyrilliwam salt as described in US Pat.

A chemical sensitizer can be used in the electrophotographic photosensitive layer used in the present invention, and examples of the chemical sensitizer include electron-withdrawing compounds such as evatrinitrofluorenone, chloranil, and tetracyanoethylene; 65439, Japanese Patent Publication No. 5
Examples include compounds described in No. 8-102239 and the like.

The electrophotographic photosensitive layer used in the present invention may contain additives such as reinforcing agents, plasticizers, curing catalysts, crosslinking agents, fluorine-containing surfactants, and the like, if necessary.

A feature of the present invention is that a light absorption layer is provided on the back side of the transparent conductive support provided with the electrophotographic photosensitive layer as described above. That is, by providing a light absorption layer on the back surface of the support, it is possible to effectively prevent interference fringes that occur when recording an image using a semiconductor laser.

Dyes that absorb near-infrared light are used for this purpose. Examples of such dyes include JP-A-58-125246.
No., JP-A-59-84356, JP-A-59-2028
cyanine dyes described in JP-A-60-78787, etc., JP-A-58-173696, JP-A-5
Methine dyes described in JP-A No. 8-181690, JP-A-58-194595, etc.; JP-A-58-112793;
No., JP-A-58-224793, JP-A-59-481
No. 87, JP-A-59-73996, JP-A-60-52
940, naphthoquinone dyes described in JP-A No. 60-63744, etc., squarylium dyes described in JP-A-58-112792, etc., British Patent No. 434,
Examples include cyanine dyes described in No. 875.

It is also possible to use the aforementioned sensitizing agents for this purpose. More preferred examples include dyes represented by the following general formulas (1) and (tr).

General formula (D (wherein, R1, R2, R5, R4, R5 and R6 may be the same or different from each other and represent a substituted or unsubstituted alkyl group, and zl and z2 each represent a substituted or unsubstituted alkyl group) Indicates a group of nonmetallic atoms necessary to form a benzo-fused ring or a naphtho-fused ring.

Tatashi, R' + R2r R5+ R' r R5,
At least one of R6+ Z' and Z2 has an acid group as a substituent. L represents a substituted or unsubstituted methine group, and X represents an anion. n is 1 or 2, and is 1 when the dye forms an internal salt.

General formula (IT) (wherein R11 represents a substituted or unsubstituted alkyl group, a substituted or unsubstituted aryl group, or a substituted or unsubstituted heterocyclic group, R and R may be the same or different from each other, Represents a hydrogen atom or a group capable of substituting it, and R and R14 may be the same or different, and represent a hydrogen atom, a rogene atom, a substituted or unsubstituted alkoxy group, or a substituted or unsubstituted alkyl group. R+6 and R+7 may be the same or different, and represent a substituted or unsubstituted alkyl group, a substituted or unsubstituted aryl group, an acyl group, a sulfonyl group, or a 5- or 6-membered group in which R and R are connected to each other. Represents a group of nonmetallic atoms necessary to form a ring. However, R, !-R are not hydrogen atoms at the same time.) Next, details about the dyes represented by the general formulas (D and (II)) are shown. Describe.

In the general formula (1), R' r R2* R3,
R', R".

R6 may be the same or different and represent a substituted or unsubstituted alkyl group, and Z and z2 each represent a group of nonmetallic atoms necessary to form a substituted or unsubstituted benzo-fused ring or naphtho-fused ring. . However, R, R, R, R.

At least one, preferably two or more, more preferably four to six of the groups represented by R, R, Z, and Z have an acid substituent (for example, a sulfonic acid group or a carzenic acid group). , in particular represents a group which allows the dye molecule to have from 4 to 6 sulfonic acid groups. In the present invention, the sulfonic acid group refers to a sulfo group or a salt thereof,
Further, the term "carzenic acid group" means a calzexyl group or a salt thereof, respectively.

L represents a substituted or unsubstituted methine group, and X represents an anion. Specific examples of anions also represented by X include halogen ions (CL, Br), p-1-luenesulfonic acid ions, ethyl sulfate ions, and the like.

n represents 1 or 2, and is 1 when the dye forms an inner salt.

The alkyl groups represented by R1, R2, R3, R', R5, R' are preferably lower alkyl groups having 1 to 5 carbon atoms (e.g., methyl group, ethyl group, n-propyl group, n-butyl group, isopropyl group). , n-pentyl group, etc.), and may have a substituent (for example, a sulfonic acid group, a carzene acid group, a hydroxyl group, etc.).

More preferably, R1 and R4 represent a lower alkyl group having 1 to 5 carbon atoms (eg, 2-sulfoethyl group, 3-sulfopropyl group, 4-sulfobutyl group, etc.) having a sulfonic acid group. Substituents for the benzo-fused ring formed by the non-metallic atom group represented by
For example, F, CL, Br, etc.), cyan group, substituted amino group (e.g. dimethylamino group, diethylamino group, ethyl-4-sulfobutylamino group, di(3-sulfoprogyl)amine group, etc.), immediately after or a substituted or unsubstituted alkyl group having 1 to 5 carbon atoms bonded to the term via a divalent linking group (e.g. methyl group, ethyl group, propyl group, butyl group, etc. (substituents include sulfonic acid group, carzene group, etc.) Acid group, hydroxyl group, etc.) are preferred, and divalent linking groups are, for example, -Q-, -NHCO-.

-NH8O2-, -NHCOO-, -NHCON'H-
, -Coo-.

-co-, -5o2-, etc. are preferred.

The substituent of the methine group represented by L has 1 to 1 carbon atoms.
5 lower alkyl groups (for example, methyl group, ethyl group, etc.), . . . rogene atoms (for example, F, C1°Br, etc.) are preferred. In addition, the substituents of the methine group represented by L are bonded to each other to form a 6-membered ring containing three methine groups (for example, a 4-membered ring).
, 4-dimethylcyclohexene ring).

Specific examples of the dye compound represented by the general formula (T) used in the present invention are shown below, but the scope of the present invention is not limited thereto.

(I-2) so3e 5o3K (I-4) (I-5) (I-6) (I-7) < z-s ) CI-9) (1-i o ) (I-11) (I- 12) (I-16) (I-17) (I-18) so3e 503K CI-19) Cl-20) (I-21) (I-22) (I-23) (I-24) (I- 25) (I-26) (l-27) (I-28) (I-29) (■-30) Next, in the above general (II), R11 is a substituted or unsubstituted alkyl group, a substituted or unsubstituted alkyl group, represents an aryl group (e.g., phenyl group, naphthyl group, etc.), a substituted or unsubstituted heterocyclic group, R and 115 may be the same or different from each other, and represent a hydrogen atom or a group capable of substituting this, R13 and R14 may be the same or different and include a hydrogen atom, a halogen atom (e.g. α, Br, etc.), a substituted or unsubstituted alkoxy group having 1 to 5 carbon atoms (e.g. methoxy group, ethoxy group, 2-sulfoethoxy group, methoxyethoxy group, etc.), substituted or unsubstituted alkyl group. However, R and R14 are not hydrogen atoms at the same time, R16 and R17 may be the same or different, and may be substituted or unsubstituted alkyl groups, substituted or unsubstituted aryl groups (e.g. phenyl group, naphthyl group, etc.). ), acyl groups (e.g. acetyl group, propionyl group, etc.), sulfonyl groups (e.g. methanesulfonyl group, ethanesulfonyl group)
Furthermore, ``R'' and R17 represent a group of nonmetallic atoms necessary for forming a 5- or 6-membered ring (for example, a zerolidine ring, a zeberidine ring, a morpholine ring, etc.).

The alkyl groups represented by R11, R15, R14, R16 or R17 may be the same or different, and may be lower alkyl groups having 1 to 5 carbon atoms (for example, methyl group, ethyl group, propyl group, isopropyl group, t- butyl group, etc.)
is preferable, and may have a substituent (for example, a sulfo group, a carboxyl group, a hydroxyl group, etc.).

The aryl groups represented by R11, R16, or R17 may be the same or different, and may be substituted or unsubstituted phenyl groups (substituents such as sulfo groups, carboxyl groups, hydroxyl groups, cyano groups, etc.)\logen atoms (e.g. chlorine atom, fluorine atom, etc.), C2-5 acyl group (
(e.g. acetyl group, propionyl group, etc.), carbon number 1~
5 sulfonyl group (e.g. evamethanesulfonyl group, ethanesulfonyl group, 2-sulfoethanesulfonyl group, 3-sulfopropanesulfonyl group, etc.), carbamoyl group having 1 to 5 carbon atoms (e.g. unsubstituted carbamoyl group, methylsulfonyl group), Moyl group, 2-sulfoethylsulfamoyl group,
2-carboxyethylsulfamoyl group, 2-hydroxyethylcarnosulfamoyl group), sulfamoyl group having 1 to 5 carbon atoms (e.g., unsubstituted sulfamoyl group, methylsulfamoyl group, ethylsulfamoyl group, 2- sulfoethylsulfamoyl group, 2-carboxyethylsulfamoyl group, etc.), alkoxycarbonyl groups having 1 to 5 carbon atoms (e.g., methoxycarbonyl group, ethoxycarbonyl group, trichloroethoxycarbonyl group, trifluoroethoxycarbonyl group, etc.) , an alkoxy group having 1 to 5 carbon atoms (e.g., methoxy group, ethoxy group, etc.), an amine group (e.g., dimethylamino group, diethylamine group, etc.)) or a substituted or unsubstituted naphthyl group (when the substituent is phenyl group) ) are preferred.

The substituted or unsubstituted heterocycle represented by B 11 represents a monocyclic heterocycle or a fused heterocycle, such as a 1,3-thiazole ring, a 1,3,4-)riazole ring, a benzothiazole ring, a benzimidazole ring. , benzoxazole ring, 1,3,4-thiadiazole ring, etc. (substituents include lower alkyl groups such as methyl group and ethyl group, lower alkoxy groups such as methoxy and ethoxy groups, sulfo group, hydroxyl group, carboxyl group, etc.) is preferred.

The groups capable of substituting hydrogen atoms represented by R12 and R are:
Halogen atom (e.g. F, α, Br, etc.), hydroxyl group, sulfo group, carboxyl group, cyano group, or directly or 2
Represents a substituted or unsubstituted alkyl group having 1 to 5 carbon atoms [for example, methyl group, ethyl group, etc. (substituents include sulfo group, carboxyl group, hydroxyl group, etc.)] bonded via a valent linking group, and For example, the linking group is -〇-1-NH
CO-1-NH8O2-1-NHCOO-1-NHCO
Represents NH-, -COO-1-CO-1-8O2-, etc.

Specific examples of the dye compound represented by the general formula (II) used in the present invention are shown below, but the scope of the present invention is not limited thereto.

Exemplary compound (II-1) (II-2) (C2H5)3N-HO3S(CH2)2''(CH2)
2SO3H-N(02H5)5(II-5) HO5S(CH2)2”(CH2)2SO3H(II-
7) ^ H5C2” (CH2) 4803K (ll-9') 7N.

H5O2(CH2)45O3K KO3SCCH2>2”(CH2)280.KK03S
(CH2)3''(CH2)3SO3■502'\C
H2)4So3K H2O;''(CI(2)4So,K KO5S(CH2)2''(CH2)2SO,KNa0
5S(CH2)4''(CH2)45O5NaNa03
S(CT(2)j"(CH2)45O3NaH5C2'
'(0M2)4So3 with N1 H5O2(CH2), SO2 with H2O2''(CH2)45O3K H5C2''(CH2)4803K N(C2H5)2 H5C2'ゝ(CH2)45o3K H5C2+''(CH2)2S05Na H5C2''(CH2) 45O3K H5C2/ゝ(CH2)2SO3K H5C2''(CH2)2COOK cH,”cH2cH2NH8O2cH3H5C Riゝ(C
H2)2SO5Na a,c,'ゝ(CH2)2S05 c2H, ``(CH2)5SO5Na H5C,''(CH2)45O3Na KO3S(CH2)4''(CH2)45o3KCHlゝ(CH2)3SO5, CH5(CH2 )5SO5K H5C[ゝ(CH2)45O5Na H5C(ゝC2H5 H2O2''C2H5 H5C2'ゝC2H5 H2O2''C2H5 H5C2+'light 2H5 H5C2''C2H5 7N, H2O2C2H3 H2O2''C2H3 H5CrXC 2H5 H2O2"C2H5 H5C2"C2I (5 H2O2"C2H5 H5C, 2”CH2CH20H H2O2”CH,2CH2NH8O2CH3H5C2”
C2H3 H5C2"C2H5 H2O2"c2a5 CH, /"'CH3 CH3''CH5 H5c2"C2H3 H2O2"02H5 H2O2"C2H3 H2O2"02H5 CH30CH2CH2"CH2CH20CH3H5C2
"C2H3 H2O," C2H3 H5C2''C, 2H5 7N, H5O2C2H3 H5 (2"C2H5) The light absorption layer in the present invention contains a near-infrared absorbing dye, especially a dye represented by the general formula (I) or (11). Dissolved or dispersed in a suitable solvent (water, alcohol, methylselonorph, benzene, l-luene, xylene, chlorobenzene, dichloromethane, dichloroethane, trichloroethane, cyclohexanone, tetrahydrofuran, dioxane, acetone, methyl ethyl keto/or a mixed solvent thereof) together with a binder. , the back side of the conductive support, that is, the side not provided with electrophotographic exposure J-h'', is coated and dried.

The light absorption may be provided before and after the electrophotographic photosensitive layer is provided, or may be provided at the same time.

As a light-absorbing binding agent for horses, gelatin and other hydrophilic leaf rollers,
In addition to 1-doped compounds, polyamide, polyurethane, polynisdel, epoxy resin, polyketone, styrenic polymer and copolymer 1,45-N-vinyl carpanol del carbide, polysulfonate, vinyl chloride resin,
Examples include various polymeric compounds such as vinylidene chloride, vinegar, vinyl resin, and acrylic resin.

The thickness of the light absorption layer in the present invention is l/a ~ 201trn
It is preferable that Particularly preferably, it is 1 to 5 μm. Furthermore, after a toner image is formed on the electrophotographic photosensitive layer, it must be transparent enough to not interfere with reading out the image using transmitted light.

The light-transmitting electrophotographic photoreceptor of the present invention is suitable for forming images using a semiconductor laser, particularly a semiconductor laser having an emission wavelength of 750 nm or more, as a light source. In order to form an image using the photoreceptor of the present invention, a desired location on the surface of the electrophotographic photosensitive layer is charged at the time of recording according to the electrophotographic method, and then an electrostatic image is formed by scanning with a semiconductor laser. After developing the toner, it is fixed to form a toner image. electrification,
As the developing and fixing means, known means can be used.

The photoreceptor of the present invention is suitable for use as a recording material such as a microfilm. Furthermore, if necessary, the recorded image may be projected onto a screen or the like using transmitted light, or a copy may be made using a suitable printer.

〔Example〕

Hereinafter, the present invention will be explained by examples.

Example 1 An undercoat layer having the following composition was provided on the opposite side of the vapor-deposited film of a polyethylene terephthalate film having a thickness of ioo μm having a vapor-deposited film of indium oxide, and dried at 180'C for 1 minute.

Gelatin 501 was then dissolved in water, to which were added exemplified dyes (I-1) 45 grams of a 1% by weight aqueous solution of HyProxy 3,5-dichlorotriazine sodium salt was added to make a total amount of 1 tK. This gelatin-containing aqueous solution was applied onto the undercoat layer so that the dry film thickness was 5 μm to prepare a transparent conductive film having a light absorption layer.

Next, a photosensitive liquid having the following composition was coated on the opposite side of the light absorption layer (on the vapor deposited film of indium oxide) and dried to produce an electrophotographic film m1 having a photoconductive layer with a thickness of about 8 μm.

Comparative Example 1 For comparison, an electrophotographic film No. 2 was produced which was the same as Example 1 except that it did not have a light absorption layer.

Next, after this electrophotographic film was charged, the Ga-Al-As
Semiconductor laser (emission wavelength 780 nm, output 5m)
W) and developed with a negatively charged liquid toner. With the electrophotographic film I@1, a sharp image with uniform density in the solid image area was obtained. Furthermore, there was virtually no problem when observing the obtained image using transmitted light. In Comparative Example Electrophotographic Film No. 2, interference fringe-like density unevenness occurred in the solid image area, and only an unclear image was obtained.

Example 2 Electrophotographic films Seed 3 to Fly 10 were prepared in the same manner as in Example 1, except that the dyes shown in Table 1 were used in the amounts listed as dyes for the light-absorbing layer. All of these films gave clear images with uniform density in solid image areas, similar to 1 ml of electrophotographic film.

Table 1 Example-3 The following composition was coated on the opposite side of the 100 μm thick ethylene terephthalate film having a vapor deposited film of indium oxide and dried to form a transparent conductive film having a 4 μm thick light absorption layer. Obtained.

Next, a photosensitive liquid having the following composition was coated on the opposite side of the light absorption layer and dried to form an electrophotographic film N having a photoconductive layer with a thickness of 8 μm.
α11 was produced, and this film, like the first electrophotographic film, gave a clear image with uniform density in the solid image area.

Procedural amendment July 21, 1988 3. Person making the amendment Relationship to the case: Name of patent applicant (520) Fuji Photo Film Co., Ltd. 6. Number of inventions increased by the amendment 207. Specifications subject to the amendment Column 8 of "Detailed Description of the Invention" of the book, contents of amendment (1) On page 9, line 1θ of the specification, "realylamine" is amended to read "r-arylamine".

(2) Page 60, line 3 of the specification, ``In the present invention''
``In the light-absorbing layer of the present invention, the absorption dye is preferably contained in an amount of 0.1% to 50% by weight, more preferably 0.1% to 30% by weight based on the light-absorbing layer.
It is to contain it. ” is inserted.

Claims (1)

[Claims] (1) An electrophotographic photoreceptor having a transparent electrophotographic photosensitive layer on a transparent conductive support, characterized in that a light absorption layer is provided on the transparent conductive support on the side opposite to the photosensitive layer. Electrophotographic photoreceptor.