JPS62172371A - Electrophotographic sensitive body - Google Patents

Abstract

PURPOSE:To obtain the titled body capable of forming a sharp recording image with a laser ray by forming a light scattering layer on a transparent conductive substrate which is an opposite side of a photosensitive layer in the transparent electrophotographic sensitive body suitable for forming a microfilm, etc. CONSTITUTION:The transparent conductive substrate which vapor-deposits In2O3, etc., on a polyester substrate, etc., is used. The transparent electrophotographic photosensitive layer is formed on the prescribed substrate. The org. photoconductive substance such as polyvinylcarbazole and polyvinylpyrene, etc., is used as the electrophotographic sensitive layer. The light scattering layer is formed on the back side of the substrate which is formed the photosensitive layer thereon, thereby preventing the generation of an interference fringe in recording the image by the laser ray. The light scattering layer is formed by binding fine inorg. particles such as silicon oxide and zinc oxide, etc., with a binding agent. Thus, the sharp image is obtd. by forming the light scattering layer on the substrate which is the opposite side of the photosensitive layer.

Description

Detailed Description of the Invention [Field of Commercial Use] The present invention relates to a translucent electrophotographic photoreceptor suitable for producing FM such as microfilm. In particular, the present invention is suitable for recording using a laser. j original nature' 龜子Photography impression body (two relations).

[Conventional technology]

As a method of forming an image using electrophotography, a toner image is released on an electrophotographic photoreceptor exclusively made for Selendrum.
9 this for i! The method of transferring to tracing paper and the formation of a photo4-electroconductor layer on a support such as paper or film (toner + 1 on the recording material)
Methods such as forming a 1:1 image are widely used.

Recently, as a special application of this method, an electrophotographic photoreceptor in which a transparent organic photoconductor rm is provided on a transparent conductive support has been developed as a recording material in fields such as microfilm. (For example, '0otica7!Eng',
vas! 20, No. 3, . 365 (+981
).

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

On the other hand, recently, an electrophotographic system using a laser as a light source has been developed. The laser used is He-N.
There are gas lasers such as e and semiconductor lasers such as Gake-AS, but semiconductor lasers have major advantages such as being smaller and cheaper than gas lasers such as He-Ne and being able to be directly modulated. are doing.

[Problem that the invention seeks to solve]

However, when a laser like this is used as the recording light for the transparent electrophotographic X photoreceptor (interference fringe-like potential unevenness occurs on the surface of the two-sensor element, the electrostatic latent image is developed with toner, and the tIJ This causes unevenness in density due to the opaque support.The surface of the electrophotographic photoreceptor for laser beam blinders using an opaque support is roughened (heated) to prevent the generation of interference fringes. Using a pourable support (Japanese Unexamined Patent Publication No. 58
-1.62975, Japanese Patent Application Publication No. Sho Fi8-171057,
ELJ (Japanese Unexamined Patent Publication No. 60-172047) A conductive support in which an undercoat layer having a rough surface with no gloss is provided between the conductive support and the photosensitive layer. It has been proposed to provide a titanium black dispersion subbing layer between the body and the photosensitive layer (Japanese Patent Laid-Open No. 60-18
Publication No. 4258). However, even if such a subbing layer is provided between the conductive layer and the conductive support of the transparent photoreceptor, not only is it not possible to obtain a satisfactory effect, but also in the case of titanium black, etc. The presence of the dispersion layer prevents the recorded image from being read out with transmitted light.

[Means for solving problems]

The inventors of the present invention have conducted various studies on the above causes, and have found that since laser is a coffeelet light, the light-transmitting electrophotographic photoreceptor (electrophotographic photosensitive layer and conductive support) can be used for recording, such as microfilm, etc. If it is thick enough to be used as a material, the laser light that enters the inside of the photoreceptor during recording is mainly reflected on the back surface of the support, and this reflected light interferes with the incident light on the surface of the photoreceptor. Knowing that interference fringes as described above occur, and discovering that the above drawbacks can be overcome by providing a light scattering layer as an antireflection layer on the back surface of the support, the present invention has been achieved. An object of the present invention is to provide a translucent electrophotographic photoreceptor suitable for laser recording. A further object of the present invention is to provide a translucent electrophotographic photoreceptor suitable for recording with a semiconductor laser.

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

That is, the present invention provides transparent electrophotographic Xg light on a transparent conductive support! - The electrophotographic photoreceptor is characterized in that a binary scattering layer is provided on the transparent tetraelectric support (on the side opposite to the photosensitive layer).

The present invention will be explained in detail below.

Examples of the transparent support used in the present invention include polyester, polycarbonate, polyamide, acrylic (1
In this case, a transparent thermoplastic film made of polyamideimide, polystyrene, polyacedal, polyolefin, etc. with conductivity added thereto is used. As a four-body process, a method of vapor-depositing aluminum, gold, para-neem, indium, etc., or In2O
3. A method of vapor-depositing arsenic acid such as S no 2, a method of dispersing metal powder or a metal acid arsenide such as SnO□ in a binder polymer, or a method of applying an arsenic acid such as an organic quaternary salt. Examples include a method in which a compound is coated with a binder polymer, and a method in which a copper acetonitrile solution is coated on iodine.

As the electrophotographic photosensitive layer used in the present invention, an organic photoconductive layer made of an organic photoisoelectric material is used, and a toner image is formed on the photosensitive surface to a degree that does not interfere with reading the recorded image with transmitted light. It is necessary to have a certain degree of transparency.

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

Examples of polymers include the following:

ill Polyvinylcarbazole and its derivatives described in U.S. Patent No. 3,037,861, Japanese Patent Publication No. 34-10966, Japanese Patent Publication No. 42-19751, and Japanese Patent Publication No. 42-25230, (2) Japanese Patent Publication No. 43-18 .6
Polyvinylpyrene, polyvinylanthracene, poly-2-vinyl-4-(4'-dimethylaminophenyl)-5 described in Japanese Patent Publication No. 74 and Japanese Patent Publication No. 43-19192
- Vinyl polymers such as phenyl-oxitisol and poly-3-vinyl-N-ethylcarbazole, (3) polyacenaphthylene described in Japanese Patent Publication No. 19193-1983,
Polymers such as polyindene, copolymerization of acenaphthylene and styrene, etc.; (4) condensation resins such as pyrene-formaldehyde 1411&, brompyrene-formaldehyde 14Ilh, and ethylcarbazole-formaldehyde resins described in Japanese Patent Publication No. 56-13940;
(51 JP-A-56-90883 and JP-A-56-16
1! Various triphenylmedan polymers described in '+50 publication.

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

(6) Trizozole derivatives described in US Pat. No. 3,112,197, etc.; (7) Oxitidiazole derivatives described in US Pat. No. 3,189,447, etc.; Imidazole derivatives described in (9) U.S. Patent Nos. 3,615,402 and 382,098
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-55-108ft67, JP-A-55-1569
Polyarylalkane derivatives described in No. 53, JP-A-56-3fif'i56 specification, publications, etc. (11) U.S. Patent No. 3180729, U.S. Patent No. 42
No. 78746, JP-A-55-88064, JP-A-55
-88065, JP 49-105537, JP 55-51086, JP 56-80051, JP 56-88141, JP 57-45545, JP 54-112637 , JP-A-55-74546, publications, etc. (: Described pyrazoline derivatives and pyrazolone derivatives, (11) U.S. Patent No. 3615404 Mei J@嘗, JP-A-51-10105, JP-A-54- 83435, JP-A No. 54-110836, JP-A-54-119925, JP-A-46-3712, JP-A-47-28336 specification, gazette, etc., (12) U.S. Patent No. 3567450, Special Publication No. 4
No. 9-35702, West German Patent (DAS) 311051
No. 8, U.S. Patent No. 3180703, U.S. Patent No. 324
0597, U.S. Patent No. 3,658,520, U.S. Patent No. 4,232,103, U.S. Patent No. 4,175,961, U.S. Patent No. 4,012,376, JP-A-55-144250, JP-A-56-119132, JP-B-Sho 39-27Fi
77, JP-A-56-22437, publications, etc., (13) amino-substituted chalcone derivatives described in U.S. Pat. No. 3,526,501, (14) U.S. Pat. No. 3,542,546. (15) Oxitisol cast conductor as described in U.S. Pat. No. 3,257,203, etc.; (16) Styryl tenthracene as described in JP-A-56-46234, etc. derivatives, (17) fluorenone derivatives described in JP-A-54-110837, etc., (18) U.S. Pat. No. 3,717,462, JP-A-54-5
No. 9143 (corresponding to U.S. Pat. No. 4,150,987), JP-A-55-52063, JP-A-55-52064,
JP-A-5'5-46760, JP-A-55-85495
No., JP-A-57-11350, JP-A-57-1487
Hydrazone derivatives disclosed in No. 49, JP-A-57-64244, publications, etc. (19) JP-A-39-11546, JP-A-55-79
Examples include benzidine derivatives disclosed in US Pat. No. 450 (corresponding to US Pat. No. 4.265.990) and US Pat. No. 4,047,949.

When the organic photoconductor is a low-molecular 11-compound, it may contain a polymer (hypolymerate) having suitable film properties as a binder.Specifically, polyamide, polyurethane, polyester, epoxy, etc. Resin, polyketone, styrene polymer and copolymer, 7-gly-N-vinylcarbazole,
Polycarbonate, polyester carpowood, polysulfone, salt hibinylidene resin, salt 1 vinylidene resin,
Examples include various polymers such as vinyl acetate resin and acrylic resin. If the organic photoconductor is a polymer (a polymer compound), it has radiation exposure property itself, but if necessary, the above-mentioned polymer f compound may be added.

A sensitizing dye can be added to the electrophotographic photosensitive layer used in the present invention depending on the necessity.

As a sensitizing dye, [Society of Photographic Scientists and Engineers, (
Society of PhotographicSc
cientists and engineers) J,
19.60-64 (1975), “Applied Optics 3J 5up
p1. 3.50 (1969), United States Patent (USP) 3
,037,861,USP3,250,615,UPS
3,712°811, British Patent No. 1,353,264, “
Research Disclosure (Research D)
i sc In5ure) J+10938 (109,1
May 973 issue, p. 62 onwards), USP 3,141.70
0. USP3゜938.994, Japanese Patent Publication No. 1983-1456
0. JP-A-56-145611 JP-A-5F-29Fi
8fi, JP-A-56-29587, JP-A-5FI-65
885, JP-A-55-114259, JP-A-56-35
Examples include various sensitizing dyes disclosed in, for example, No. 141. These known sensitizing dyes and other dyes that increase the sensitivity of an organic photoconductor can be appropriately selected and used, but are not limited thereto.

When recording using the g-optical body used in the present invention in a system using a semiconductor laser as a light source, the above-mentioned
#, the conductive layer must have main absorption in the near-infrared region of 750 nm or more, and preferably exhibit a high g-change in this region. Various sensitizing agents can be used for this purpose.

For example, the substituted arylbenzo(thio)bilylium salts described in U.S. Pat. No. 3,881,924;
142645 (U.S. Pat. No. 4,327.169), trinotin thiol biryllium salt, JP-A-58-181
No. 051, No. 58-220143, No. 59-41363, No. 59-84248, No. 59-84249, 59-1
No. 46063, No. 59-146061 (= biryllium-based compounds described, cyanine dyes described in JP-A-59-216146, etc.). It is preferable to use the pendamine thiopyrylium salt described in Japanese Patent Application No. 475 and the biryllium-based arsenic compound and amide (an arsenic compound) described in Japanese Patent Application No. 1997-213197.

In the electrophotographic photosensitive layer used in the present invention, a carbon sensitizer can be used. Examples of the hydrogen sensitizer include electron-withdrawing hydrogen compounds such as trinitrofluorenone, chloranil, and tetracyanoethylene. , JP-A-58-65439, JP-A-58-102239, and the like.

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

A feature of the present invention is that a light scattering 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 scattering layer on the back surface of the support (secondly, it is possible to effectively prevent interference fringes that occur when recording an image using a semiconductor laser).

As the light scattering layer used in the uninvention, a metal acid (
A layer in which fine powder such as atomized material or other inorganic material is dispersed is used.

These fine powders include acid [zinc, acid f-hitidan,
Acids (hyaluminum, acid 1 hissilicon, acid 1 hiszirconium, acids (hyantimony, acid C histin, metal acids such as #(hyindium), charcoal, hissilicon, charcoal (hisidane,
Nitrogen (Hiwa Uso, Nitrogen)
Examples include fine powders of inorganic substances such as Himagukisium and Futsu1 Hycerium.

The light-scattering layer in the present invention includes at least one of the above-mentioned fine particles in a suitable solvent such as water, alcohol, methyl cellosol, benzene, toluene, xylene, chlorobenzene, dichloromethane, dichloroethane, trichloroedane, cyclohexanone, tetrahydrofuran,
It is dispersed in a solution of diochitin, acetone, methyl ethyl ketone, etc., and a mixed solvent thereof) and applied and dried on the four sides of the conductive support, that is, on the side of the support where the electrophotographic photolayer is not provided. The light scattering layer may be provided before or after the electrophotographic photosensitive layer is provided, or may be provided at the same time.

The binder used in the scattering layer of the present invention is polyamide,
Polyurethane, polyester, epoxy resin, polyketone, styrenic polymer and copolymer, poly-N-vinylcarbazole, polycarbonate, polyester carbonate, polysulfone, salt (vinyl resin, salt 1-hibinylidene resin, vinyl acetate resin, acrylic resin, etc.) Various polymeric carbon compounds can be mentioned.

The light-scattering layer in the present invention must be transparent between particles that do not interfere with the reading of the toner image with transmitted light after forming a toner image on the electrophotographic photosensitive layer. That is, when recording with a laser (2) it must be able to prevent reflected light from the back surface of the support and be transparent to the readout light, and the grain darkness and Select the dispersion concentration, the thickness of the light scattering layer, etc.

The intergranularity of fine powder is 7 to 200 mμ, and the dispersion density changes! It is preferably 1 to 70% heavy beak. More preferably 1-2
It is 0% leaf. The thickness of the light scattering layer is 1 to 2011
m is preferred. More preferably, it is 1 to 5 μm.

Another example of the light-scattering layer used in the present invention is a method of creating a light-scattering layer by making fine scratches on the surface of the support by sandblasting, etc., as described in JP-A No. 60-32056, etc. Examples include a method of providing a layer having a Benard cell structure, and a method of forming a fine pattern on the surface of the support by stamping or the like.

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 CC750n or more. C: forming an image using the photoreceptor of the present invention is performed by charging a desired location on the surface of the Nariko photosensitive layer during recording according to electrophotography, and then scanning with a semiconductor laser to form an electrostatic image; After this toner is developed, it is fixed to form a toner image. Known means can be used as charging, developing and fixing means.

The photoreceptor of the present invention is suitable for use as a recording material such as a microfilm. Also: 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 using Example C.

Example-1 Salt (Himethylene 230F/The above assembled fabric was heated with a homogenizer at 10.OOOrpm x 3
The mixture was dispersed for 0 minutes to prepare a Q sheath liquid for a light scattering layer.

This was then applied using a wire bar to the opposite side of the polyethylene terephthalate film with a thickness of 1 OO'pm, which had a vapor-deposited film of phosphoric acid, and dried to form a light-scattering layer with a thickness of 4 μm. A photosensitive solution having the following composition was coated on the opposite side of the light scattering layer and dried to prepare an electrophotographic film No. 1 having a photoconductive layer having a thickness of 8.7 μm.

Comparative Example 1 For comparison, an electrophotographic film 2 was produced which was the same as in Example 1 except that it did not have a light scattering layer.

Next, this Nariko photographic film was charged ten times and Ga-AI-p
s#-8 body laser (emission wavelength 780 nm, output 5 m
The image was exposed using a scanning type exposure machine with a 9-voltage (W), and exposed using a liquid toner having a chargeability of 9. With electrophotographic film No. 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 the electrophotographic film No. 2 of the comparative example, interference fringe-like dark unevenness occurred in the solid image area, and only an unclear image was obtained.

Example-2 Practical Example-i (: To prepare an electrophotographic film case 3 in which the following composition was mixed with g-light liquid.

Comparative Example-2 An electrophotographic film No. 4 was produced which was the same as in Example-2 except that it did not have a comparative light-scattering film.

Next, this electrophotographic film was developed with WyYL, a liquid toner having load-forming properties, using a scanning exposure machine equipped with a ten-band He--Ne laser (emission wavelength: 633 nm, output: 5 mW).

With Shigeko Photographic Film Nn3, a sharp image with a uniform structure in the peta image area was obtained, and there was virtually no problem when observing the obtained image with transmitted light. In electrophotographic film No. 4 as a comparative example, dark unevenness in the form of interference fringes occurred in the solid image area, and only an unclear image was obtained.

Claims (1)

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