JPH0850401A - Optical sensor, information recorder and information recording and reproducing method - Google Patents

Abstract

PURPOSE:To provide an optical sensor having high sensitivity and excel lent information recording performance. CONSTITUTION:This optical sensor is produced by forming an electrode layer 12 on a supporting body 11 and successively forming a charge producing layer 14 and a charge transfer layer 12 on the electrode layer 12. The ionization potential of the charge transfer material in the charge transfer layer 15 is lower than the ionization potential of the charge producing material in the charge producing layer 14, and the difference between them is at least 0.2eV. The information recording device consists of this optical sensor and an information recording medium disposed facing each other or laminated. The information recording medium consists of an electrode layer and an information recording layer thereon in which information can be formed by an electric field or charges. Both electrodes are connected so that voltage can be applied. By exposing the medium for information while voltage is applied between electrodes, recording can be done in the information recording medium according to the exposure for information. Since the optical sensor produces large differences in currents and voltages between in the area not exposed and in the exposed area, it has high sensitivity for recording in the information recording medium.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical sensor capable of recording optical information on an information recording medium in the form of visible information or electrostatic information, the information recording performance of which is significantly amplified. The present invention relates to an optical sensor, an information recording device incorporating the optical sensor, and an information recording / reproducing method.

[0002]

2. Description of the Related Art An optical sensor composed of a photoconductive layer having an electrode provided on the front surface and an information recording medium composed of a charge holding layer having an electrode provided on the rear surface are arranged on the optical axis, facing the optical sensor. Then, exposure is performed while applying a voltage between both electrode layers, electrostatic charge is recorded on the charge holding layer according to the incident optical image, and the electrostatic charge is developed by toner or generated by potential reading, For example, it is described in JP-A-1-290366 and JP-A-1-289975.
Further, the charge retention layer in the above method is a thermoplastic resin layer, the electrostatic charge is recorded on the surface of the thermoplastic resin layer and then heated,
A method of visualizing the electrostatic charge recorded by forming a frost image on the surface of the thermoplastic resin layer is described in, for example, Japanese Patent Application Laid-Open No. 3-192288.

Further, the applicant of the present invention uses the polymer-dispersed liquid crystal layer as the information recording layer in the above-mentioned information recording medium, exposes it when a voltage is applied in the same manner as described above, and aligns the liquid crystal layer by an electric field formed by an optical sensor. An information recording / reproducing method of performing information recording by using a transmitted light or reflected light for reproducing information is described in Japanese Patent Application No.
We applied for 3394 and Japanese Patent Application No. 4-24722.
This information recording / reproducing method makes it possible to visualize recorded information without using a deflector.

[0004]

DISCLOSURE OF THE INVENTION The present invention provides an optical sensor which has a significantly enhanced information recording performance on an information recording medium and high sensitivity, and an information recording apparatus and an information recording / reproducing method using the optical sensor. Is an issue.

[0005]

The optical sensor of the present invention comprises:
In an optical sensor in which an electrode layer is provided on a support and a charge generation layer and a charge transport layer are sequentially stacked on the electrode layer, the ionization potential of the charge transport material in the charge transport layer is the charge generation property in the charge generation layer. Lower than the ionization potential of the substance, and the difference is at least 0.2e
It is characterized in that it is v.

Further, the information recording apparatus of the present invention is an optical sensor in which an electrode layer is provided on a support, and a charge generation layer and a charge transport layer are sequentially laminated on the electrode layer. An optical sensor in which the ionization potential of the charge-transporting substance is lower than the ionization potential of the charge-generating substance in the charge-generating layer and the difference is at least 0.2 ev, and information can be formed on the electrode layer by the electric field or the amount of charge. The information recording layer is arranged so as to face the information recording medium in which the information recording layers are laminated or laminated, and the electrodes are connected so that a voltage can be applied, and the information is exposed by the information exposure in the state where the voltage is applied between the electrodes. It is characterized in that recording can be performed on a recording medium according to information exposure.

Further, the above-mentioned photosensor is characterized in that the charge-transporting substance is a p-divinylbenzene-type or butadiene-type charge-transporting substance, and the charge-generating substance is a bisazo-type pigment.

The above photosensor is semiconductive in the layer width direction, and a voltage is applied between the electrodes of the photosensor and the electrodes of the information recording medium in a state where information is exposed,
Alternatively, information exposure with voltage applied can generate a photo-induced current that is amplified more than the current caused by the information exposure, and information can be recorded on the information recording medium at an intensity higher than the intensity caused by the information exposure. , Also, when the voltage is continuously applied even after the information exposure is finished, it exhibits relaxation decay type conductivity,
It is characterized in that it has the effect of continuing the information recording on the information recording medium.

The above optical sensor has 10 ⁵
When an electric field strength of 10 ⁶ V / cm is applied, the passing current density in the unexposed portion of the photosensor is 10 ⁻⁴ to 10 ⁻⁷ A.
/ Cm ² and the specific resistance of the information recording medium is 10 ¹⁰ to
It is characterized in that it is 10 ¹³ Ω · cm.

The information recording / reproducing method of the present invention is an optical sensor in which an electrode layer is provided on a support, and a charge generation layer and a charge transport layer are sequentially laminated on the electrode layer. An optical sensor in which the ionization potential of the transporting substance is lower than the ionization potential of the charge generating substance in the charge generating layer, and the difference between them is at least 0.2 ev, and information capable of forming information on the electrode layer by the electric field or the charge amount. The information recording medium in which recording layers are laminated is arranged so as to face each other on the optical axis with a gap therebetween, or is laminated, and the electrodes of the optical sensor and the electrodes of the information recording medium are connected so that a voltage can be applied. After recording information on the information recording medium by applying voltage with information being exposed between electrodes or by exposing information with voltage being applied, the information recording medium Characterized by reproducing a visible information recorded information by transmitted or reflected light.

The present invention will be described in detail below. Figure 1
It is sectional drawing for demonstrating an optical sensor. The photosensor 10 is formed by laminating a photoconductive layer 13 on an electrode 12 formed on a substrate 11, and the photoconductive layer 13 is composed of a charge generation layer 14 and a charge transport layer 15.

The charge generating layer 14 is composed of a charge generating substance and a binder resin. As the charge-generating substance, a pyrrole-based dye, a thiapyrylium-based dye, an azurenium-based dye, a cyanine-based dye, azurenium-based dye, or another cation-based dye such as those disclosed in Japanese Patent Application No. 5-4721,
Squarylium salt dyes, phthalocyanine pigments, perylene pigments, polycyclic quinone pigments such as pyranthrone pigments, indigo pigments, quinacridone pigments, pyrrole pigments, azo pigments, etc. Can be used in combination. Further, a structure may be employed in which two charge generating layers are provided and each layer contains a single charge generating substance.

An electron accepting substance may be added to the charge generating layer. 2, 4, 7 as electron-accepting substances
-Trinitrofluorenone, tetrafluoro-p-benzoquinone, tetracyanoquinodimethane, triphenylmethane, maleic anhydride, hexacyanobutadiene and the like can be used.

Examples of the binder resin include polyvinyl chloride resin, polyvinyl acetate resin, acrylic resin, polyester resin, polyvinyl formal resin, polyvinyl butyral resin, polystyrene resin, polycarbonate resin, polybutyl methacrylate resin, polyvinylidene chloride resin, ethyl cellulose. Resin, silicone resin, epoxy resin, phenol resin, melamine resin, UV curable resin, thermosetting resin, vinyl chloride-vinyl acetate copolymer resin, vinyl chloride-acrylic copolymer resin, vinyl chloride-ethylene copolymer Resins, acrylic-styrene copolymer resins, styrene-butadiene copolymer resins, ethylene-vinyl acetate copolymer resins and the like can be mentioned, and they can be used alone or in combination of two or more.

The mixing ratio of the charge generating substance and the binder is 0 to 10 parts by weight, preferably 0.1 to 0.5 part by weight, relative to 1 part by weight of the charge generating substance. Is desirable. The electron-accepting substance is used in an amount of 0.001 to 10 with respect to 1 part by weight of the charge generating substance.
It may be used in an amount of parts by weight, preferably 0.01 to 1 part by weight.

The charge generating layer is prepared by dissolving or dispersing the charge generating substance and the binder resin in cyclohexanone, dioxane, tetrahydrofuran, toluene, xylene, dichloroethane, butyl acetate, etc., alone or in a mixed solvent. It is applied on the electrode using a blade coater, a spin coater, a dip coater, etc., and the film thickness after drying is 0.01 to 1 μm, preferably 0.1 to 0.5.
μm.

The charge transport layer 15 is composed of a charge transport material and a binder. The charge-transporting substance has a good property of transporting charges generated in the charge-generating layer, and examples thereof include oxadiazole-based, oxazole-based, triazole-based, thiazole-based, triphenylmethane-based, styryl-based, pyrazoline-based, and hydrazone. , Aromatic amine-based, carbazole-based, polyvinylcarbazole-based, stilbene-based, enamine-based, azine-based, amine-based, butadiene-based, polycyclic aromatic compound-based, and the like, and examples thereof include substances having good hole transport properties.

Preferred are butadiene-based, amine-based, hydrazine-based, p-divinylbenzene-based, and butadiene-based charge-transporting substances, specifically, JP-A-62-28.
7257, JP-A-58-182640, JP-A-48-43942, JP-B-34-5466, JP-A-58-198043, JP-A-57-
101844, JP-A-59-195660, JP-A-60-69657, and JP-A-64-65.
555, JP-A-1-164952, JP-A-64-57263, JP-A-64-68761, JP-A-1-230055, JP-A-1-142.
654, JP-A-1-152655, JP-A-1-155358, JP-A-1-155357, JP-A-1-161245, and JP-A-14264.
The charge transport materials described in Japanese Patent Publication No. 3 and the like are mentioned.

According to the present invention, the ionization potential of the charge-transporting substance is lower than the ionization potential of the charge-generating substance, and the difference is at least 0.2e.
It has been found that by combining a charge-generating substance and a charge-transporting substance so as to attain V, it is possible to increase the sensitivity as an optical sensor. The larger the difference, the more preferable, and particularly 0.5 eV or more. Preferably there is.

“Ionization potential” in the present invention
Is an ultraviolet photoelectron analyzer (AC-1, Co., Ltd.) in the atmosphere.
This is the value obtained using RIKEN Keiki.

In order to lower the ionization potential of the charge transporting substance, in its chemical structure, the conjugated system (π electron system) in the basic skeleton is lengthened or a substituent having a large electron donating property such as an alkylamino group is used. There is a method of introducing more.

Examples of the combination of the charge generating substance and the charge transporting substance include a combination of a fluorenone azo pigment which is a charge generating substance and a stilbene type or triphenylamine type substance which is a charge transporting substance.
In particular, a combination of a bisazo pigment which is a charge generating substance and a butadiene type, p-divinylbenzene type or hydrazone type substance which is a charge transporting substance is preferable.

The bisazo pigment has the following structural formula

[0024]

Embedded image

Those represented by are preferred.

The charge transporting substance has a structural formula

[0027]

Embedded image

[0028]

[Chemical 3]

[0029]

[Chemical 4]

Is exemplified. In the above, a substance having a hole-transporting property is exemplified as the charge-transporting substance, but the electron-transporting substance described in Japanese Patent Application No. 5-4721 may be used.

As the binder resin, the same binder resin as in the above-mentioned charge generating layer can be used.
Preferably polyvinyl chloride resin, polyvinyl acetate resin,
Acrylic resin, polyester resin, polyvinyl formal resin, polyvinyl butyral resin, polystyrene resin, polycarbonate resin, polybutyl methacrylate resin, polyvinylidene chloride resin, ethyl cellulose resin, silicone resin, epoxy resin, phenol resin,
Melamine resin, vinyl chloride-vinyl acetate copolymer resin,
Vinyl chloride-acrylic copolymer resin, vinyl chloride-ethylene copolymer resin, acrylic-styrene copolymer resin,
Examples thereof include styrene-butadiene copolymer resin, ethylene-vinyl acetate copolymer resin, polyvinyl acetal resin, and styrene-butadiene copolymer resin. It is not necessary when the charge transporting material has a function as a binder resin. The binder resin to be used has a weight average molecular weight of 1,000 to 100,000, because the coating suitability deteriorates as the molecular weight increases.

In the photosensor of the present invention, the sensitivity of the photosensor is increased by the interaction between the charge generating substance and the charge transporting substance. Further, since the generation efficiency of photocarriers varies depending on the state of the interface between the charge generation layer and the charge transport layer, it is effective to reduce the content ratio of the binder resin in the charge transport layer in order to increase the charge generation efficiency. However, when the binder resin becomes low,
It becomes difficult to form a layer having a smooth film surface as the charge transport layer, and a high-performance optical sensor cannot be obtained. Therefore, it is desirable to use the binder resin in an amount of 0 to 1 part by weight, preferably 0.1 to 0.5 part by weight, based on 1 part by weight of the charge transporting substance.

Further, similarly to the charge generating layer, an electron accepting substance may be similarly added to the charge transporting layer including the addition ratio thereof.

The charge-transporting layer is prepared by dissolving or dispersing a charge-transporting substance, a binder substance and the like in the same solvent as described in the section of the charge-generating layer, and then applying the same coating method onto the charge-generating layer. After drying, it is formed by being applied to a film thickness of 1 to 50 μm, preferably 10 to 30 μm.

The electrodes 12, it is necessary to have a transparency if opaque information recording medium side to be described later, transparent if the information recording medium side has transparency may be either opaque, 50-10 ⁴ Materials that provide a surface resistivity of Ω / cm ² , for example, metal thin film conductive films of zinc, titanium, iron, tin, etc., inorganic metals such as tin oxide, indium oxide, zinc oxide, titanium oxide, tungsten oxide, vanadium oxide, etc. An oxide conductive film, an organic conductive film such as a quaternary ammonium salt, or the like can be used alone or as a composite material of two or more kinds. Of these, oxide conductors are preferable, and indium tin oxide (ITO) is particularly preferable. The electrode is formed by a method such as vapor deposition, sputtering, CVD, coating, plating, dipping, and electric field polymerization. The film thickness needs to be changed depending on the electrical characteristics of the material forming the electrodes and the applied voltage at the time of recording information.
The TO film has a thickness of about 10 to 1000 nm and is formed on the entire surface between the information recording layer and the photoconductive layer.

The substrate 11 is required to have transparency if the information recording medium side, which will be described later, is opaque. If the information recording medium side has transparency, it may be transparent or opaque. It has a shape such as a tape or a disk and strongly supports the optical sensor, and the material and the thickness thereof are not particularly limited as long as the optical sensor has a certain strength capable of supporting the optical sensor. For example, a flexible plastic film, a plastic sheet such as glass, polyethylene, polypropylene, polyethylene terephthalate, polymethyl methacrylate, polymethyl acrylate, polyester, or polycarbonate, or a rigid body such as a card is used.

When the optical sensor is required to have a light transmitting property, a layer having an antireflection effect may be laminated on the other surface of the substrate on which the electrode 12 is provided, if necessary. The transparent substrate may be adjusted to have a film thickness capable of exhibiting the antireflection effect, or the both may be combined to provide the antireflection property.

Next, the function of the optical sensor of the present invention will be described. The photoconductive layer generally has a function of generating photocarriers (electrons, holes) in the irradiated portion when irradiated with light, and these carriers can move in the layer width. An appropriate combination of layers and electrodes,
By having semi-conductivity, the electric field or the amount of electric charge applied to the information recording medium at the time of irradiating light to the optical sensor is amplified with the passage of light, and voltage is applied even after the end of light irradiation. If continued, the increased conductivity is maintained, and the electric field or the amount of charge is continuously applied to the information recording medium.

On the other hand, a photoconductor which has been known to have a persistent conductivity in the related art is originally an insulating one, and is persistent in the process of imparting conductivity to it by light irradiation or the like. Conductivity is generated. As described above, the optical sensor of the present invention originally has the property of semiconductivity, which is a requirement for obtaining the action of the present invention, and the insulating one obtains the action of the present invention. It is not possible. The optical sensor of the present invention is preferably semi-conductive and has a specific resistance in the dark of 10 ⁹ to 10 ¹³ Ω · cm, and particularly, a specific resistance of 10 ¹⁰ to 10 ¹¹ Ω · cm. The amplification effect is remarkable. Specific resistance is 10 ¹³ Ω · cm
Larger photosensors are 10 ⁵ to 10 ⁶ V / cm
In the electric field strength range of 1), it does not exhibit the amplifying effect as in the optical sensor of the present invention. Further, an optical sensor having a specific resistance of less than 10 ⁹ is not preferable because a large amount of current flows, and a current difference between non-irradiation and irradiation cannot be obtained.

The photoconductor element used for general electrophotography has a dark resistivity of 10 ¹⁴ to 10 ¹⁶ Ω · cm and is usually used. As in the present invention, a semiconductive photosensor is used. Even if it is used for electrophotography, its purpose cannot be achieved. Further, a general photosensitive element having a large dark resistivity for electrophotography cannot be used for the purpose of the present invention.

Next, the information recording apparatus of the present invention will be described with reference to FIG. FIG. 2 is a diagram for explaining the information recording device in cross section, and includes the optical sensor 10 and the information recording medium 2.
0 and 0 are opposed to each other via a spacer 16 and are stacked.

The information recording medium 20 will be described. An example of the information recording medium is a case where an information recording layer 23 is laminated on an electrode 22, and the information recording layer is a polymer dispersed liquid crystal.

The polymer-dispersed liquid crystal is composed of a liquid crystal phase and a resin phase, and has a structure in which resin particles are dispersed in the liquid crystal phase. The liquid crystal material is smectic liquid crystal, nematic liquid crystal, cholesteric liquid crystal, or these. Mixtures of can be used. As the liquid crystal, it is preferable to use a smectic liquid crystal from the viewpoint of so-called memory property that retains its orientation and permanently retains information.

As the smectic liquid crystal, a liquid crystal substance exhibiting a smectic A phase such as a cyanobiphenyl type, a cyanoterphenyl type, a phenyl ester type, in which a terminal carbon group of a substance exhibiting liquid crystallinity is long, or a fluorine type, a ferroelectric substance Examples thereof include a liquid crystal substance exhibiting a smectic C phase used as a liquid crystal, a liquid crystal substance exhibiting smectic H, G, E, F and the like.

A nematic liquid crystal may be used, and the memory property can be improved by mixing with a smectic or cholesteric liquid crystal. For example, a Schiff base type, an azoxy type, an azo type, a benzoic acid phenyl ester type, Cyclohexyl acid phenyl ester type, biphenyl type, terphenyl type, phenyl cyclohexane type,
Known nematic liquid crystals such as phenylpyridine type, phenyloxazine type, polycyclic ethane type, phenylcyclohexene type, cyclohexylpyrimidine type, phenyl type and tolan type can be used. Also, a microcapsule obtained by mixing polyvinyl alcohol or the like with a liquid crystal material can be used. When selecting a liquid crystal material, a material having a large anisotropy of the refractive index is usually preferable because the contrast can be obtained.

The material for forming the resin phase is preferably an ultraviolet curable resin, which is compatible with the liquid crystal material at room temperature or in the state of monomer or oligomer, or in the state of monomer or oligomer. A solvent that is compatible with the liquid crystal material at room temperature or by heating may be used.

Examples of such an ultraviolet-curable resin include acrylic acid ester and methacrylic acid ester. In the state of monomer or oligomer, for example, dipentaerythritol hexaacrylate, trimethylolpropane triacrylate, polyethylene glycol diacrylate, etc. , Polypropylene glycol diacrylate, isocyanuric acid (ethylene oxide modified) triacrylate, dipentaerythritol pentaacrylate, dipentaerythritol tetraacrylate, neopentyl glycol diacrylate, hexanediol diacrylate, etc. Ester-based oligomer, nonylphenol-modified acrylate, N-vinyl-2-pyrrolidone, 2-
Examples thereof include monofunctional monomers or oligomers such as hydroxy-3-phenoxypropyl acrylate.

The content ratio of the liquid crystal to the total amount of the liquid crystal and the resin can be 10% by weight to 90% by weight. When the content of the liquid crystal is less than 10% by weight, the light transmittance is low even if the liquid crystal phase is oriented by the information recording, and when it exceeds 90% by weight, the phenomenon such as exudation of the liquid crystal occurs to cause image unevenness. Not preferable. In the information recording medium of the present invention, since the outer surface of the information recording layer can be a skin layer made of a resin layer, the content of the liquid crystal can be increased, and the ratio of the liquid crystal is 40% by weight to 80% by weight. As a result, a high-contrast information recording medium can be obtained, and the operating voltage can be lowered.

Examples of the photo-curing agent include 2-hydroxy-2-methyl-1-phenylpropan-1-one (“Darocur 1173” manufactured by Ciba Geigy), 1-hydroxycyclohexyl phenyl ketone (manufactured by Ciba Geigy). "Irgacure 184"), 1- (4-isopropylphenyl) -2-hydroxy-2-methylpropane-1
-On (Caro Geigy's "Darocur 111
6 "), benzyl dimethyl ketal (" Irgacure 651 "manufactured by Ciba-Geigy), 2-methyl-1- [4-
(Methylthio) phenyl] -2-morpholinopropanone-1 (“Irgacure 907” manufactured by Ciba-Geigy),
A mixture of 2,4-diethylthioxanthone ("Kayacure DETX" manufactured by Nippon Kayaku Co., Ltd.) and ethyl p-dimethylaminobenzoate ("Kayacure EPA" manufactured by Nippon Kayaku Co., Ltd.),
Isopropyl thioxanthone (a mixture of "Kunta Cure ITX" manufactured by Ward Brekinsop Co., Ltd.) and ethyl p-dimethylaminobenzoate may be mentioned. Among them, a liquid photocuring agent is preferable, for example, 2-hydroxy-2-methyl-1. -Phenylpropan-1-one is particularly preferable in terms of compatibility with the liquid crystal material and the resin phase forming material (monomer or oligomer), and the photo-curing agent is 0.1% by weight to 20% by weight with respect to the resin phase forming material. %, Preferably 3% by weight
It is advisable to use it in a proportion of 10% by weight.

Further, a fluorine-based surfactant is added for the purpose of forming a skin layer made of only resin on the surface of the information recording layer together with the wettability of the information recording layer with respect to the electrode layer. Examples of such fluorine-based surfactants include Sumitomo 3M Ltd.'s Florard FC-430, Florard FC-431, N- (n-propyl) -N- (β-acryloxyethyl) -perfluoro. Octyl sulfonic acid amide [EF-125M manufactured by Mitsubishi Materials Corporation], N-
(N-Propyl) -N- (β-methacryloxyethyl)
-Perfluorooctyl sulfonic acid amide [Mitsubishi Materials Corporation EF-135M], perfluorooctane sulfonic acid [Mitsubishi Materials Corporation EF-101],
Perfluorocaprylic acid [EF manufactured by Mitsubishi Materials Corporation
-201], N- (n-propyl) -N-perfluorooctanesulfonic acid amide ethanol [EF-121 manufactured by Mitsubishi Materials Corporation], and EF-102 and EF-103 manufactured by Mitsubishi Materials Corporation. EF-104, same E
F-105, EF-112, EF-121, EF
-122A, EF-122B, EF-122C, EF-122A3, EF-123A, EF-123
B, the same EF-132, the same EF-301, the same EF-30
3, the same EF-305, the same EF-306A, the same EF-50
1, the same EF-700, the same EF-201, the same EF-20
4, the same EF-351, the same EF-352, the same EF-80
1, the same EF-802, the same EF-125DS, the same EF-1
200, EF-L102, EF-L155, EF
-L174, EF-L215 and the like. Also,
3- (2-perfluorohexyl) ethoxy-1,2-
Dihydroxy propane [MF-made by Mitsubishi Materials Corporation]
100], N-n-propyl-N-2,3-dihydroxypropyl perfluorooctyl sulfonamide [MF-110 manufactured by Mitsubishi Materials Corporation], 3- (2-perfluorohexyl) ethoxy-1,2-epoxy. Propane [MF-120 manufactured by Mitsubishi Materials Corporation], Nn-propyl-N-2,3-epoxypropyl perfluorooctylsulfonamide [MF-120 manufactured by Mitsubishi Materials Corporation]
130], perfluorohexylethylene [MF-140 manufactured by Mitsubishi Materials Corporation], N- [3-trimethoxysilyl) propyl] perfluoroheptylcarboxylic acid amide [MF-150 manufactured by Mitsubishi Materials Corporation], N-
[3-trimethoxysilyl) propyl] perfluoroheptylsulfonamide [MF- manufactured by Mitsubishi Materials Corporation]
160] and the like. The fluorosurfactant is used in a proportion of 0.1 to 20% by weight, preferably 0.5 to 5% by weight, based on the total amount of the liquid crystal and the resin forming material.
Further, if necessary, a leveling agent may be added in order to improve the suitability for application of the solution and improve the surface property.

As the solvent, a solvent having a relative evaporation rate with respect to -n-butyl acetate of less than 2 should be a solvent common to each of the liquid crystal, the resin phase forming material, the photocuring agent and the fluorine-based surfactant. is necessary. "A solvent having a relative evaporation rate of less than 2 with respect to -n-butyl acetate" is, for example, "Easy-to-understand coating technology" by Yuji Harazaki 21
Pp. 7-221, published by Riko Publishing Co., Ltd., and the evaporation rate is the volatility at a constant temperature, R defined by is smaller than 2.

As the solvent, xylene (R = 0.7
6), cyclohexanone (R = 0.32), etc. having a relatively slow evaporation rate are preferable, and halogenated hydrocarbon solvents such as chloroform, alcohol derivative solvents such as methyl cellosolve, and dioxane. And the like, such as ether solvents. In addition, specifically, methyl alcohol, denatured ethanol, isopropanol, n-propanol, sec-butanol,
Isobutanol, n-butanol, methylisobutylcarbinol, diisobutylcarbinol, hexylene glycol, acetic acid-sec-butanol, isobutyl acetate (98%), n-butyl acetate, methylaluminum acetate, aluminum acetate (95% isomer mixture) ), Ethyl lactate, methyl oxitol, ethyl oxitol, isopropyl oxitol, methyl oxitol acetate, ethyl oxitol acetate, butyl oxitol, methyl dioxitol, ethyl dioxitol, butyl dioxitol, butyl dioxitol Acetate, methyl isobutyl ketone, ethyl amyl ketone, Pent-O-xon
e (ME-6K), methylcyclohexanone, diisobutyl ketone, diacetone alcohol, isophorone, 1,
4-dioxane, perchloroethylene, dichloropropane, 2-nitropropane, toluene, SBP100 / 1
40, rubber solvent, xylene, SBP140 / 165, S
BP6, SBP11, ShellsolA, White Spirit (LAWS), ShellsolE, Shel
lsolTD, white spirit (115 ° F flammable), ShellsolT, ShellsolAB, D
istilate, Solvent300, Shel
lsolN, ShellsolRA, Shellsol
K, ShellsolR, Solvent350, etc. can be mentioned.

Further, the solid content concentration in the coating solution for forming the information recording layer is preferably 10 to 60% by weight, and is applied and cured on the electrode by a coating method such as a blade coater, a roll coater or a spin coater. If necessary, a leveling agent may be added to improve the suitability for coating and improve the surface property. At the time of curing, by appropriately setting the curing conditions such as resin type, concentration, coating layer temperature, and UV irradiation conditions, a skin layer consisting of only a resin layer having no liquid crystal phase as an outer skin layer can be formed well. This makes it possible to increase the proportion of liquid crystal used in the information recording layer, and
The exudation of liquid crystal can be eliminated.

Since the film thickness of the information recording layer affects the resolution, the film thickness after drying is 0.1 μm to 10 μm, preferably 3 μm.
The thickness may be set to μm to 8 μm, and the operating voltage can be lowered while maintaining high resolution. If the film thickness is too thin, the contrast of the information recording portion will be low, and if it is too thick, the operating voltage will be high, which is not preferable.

Further, in forming the information recording layer, it is necessary to heat the ultraviolet curable resin and the liquid crystal to a temperature above a temperature at which an isotropic phase is maintained in a solvent to completely dissolve them.
As a result, an information recording phase in which the resin phase and the liquid crystal phase are uniformly dispersed can be formed. If the liquid crystal is UV-cured at a temperature below the isotropic phase, there is a problem that the phase separation between the liquid crystal and the resin becomes large. The liquid crystal domain grows too much, the skin layer is not completely formed on the information recording layer surface, the phenomenon of liquid crystal bleeding occurs, and the ultraviolet curable resin becomes matte, which makes it difficult to accurately take in information, which is preferable. Without
The ultraviolet curable resin may not be able to hold the liquid crystal and may not even form the information recording layer. On the other hand, when heating is required to maintain the isotropic phase when the solvent is evaporated, there is a problem that the wettability with respect to the electrode is particularly lowered and a uniform information recording layer cannot be obtained.

Although the case where the ultraviolet curable resin is used as the resin material has been described above, in addition to the above, a solvent-soluble thermosetting resin having compatibility with the same solvent as the liquid crystal material, such as an acrylic resin or a methacrylic resin, is used. A polyester resin, a polystyrene resin, a copolymer containing them as a main component, an epoxy resin, a silicone resin or the like may be used.

When the information recording layer itself has a supporting property and the support is omitted, a skin layer is formed on the surface of the information recording layer. Even if laminated by a method or the like, cracking does not occur and the conductivity is not lowered. In this case, it is advisable to form the information recording medium by peeling off the temporary support after providing the electrodes on the information recording layer provided on the temporary support.

In the information recording layer, the optical refractive index of the liquid crystal phase and the optical refractive index of the resin phase are substantially the same, so that the information recording layer is opaque due to light scattering in the absence of an electric field, and the liquid crystal when an electric field is applied. Since the phases are oriented and the information recording portion can be made transparent, the deflecting plate is not required for reproducing information, and the optical system for reading can be simplified.

The electrode 22 and the support 21 can be made of the same materials as those of the electrode 12 and the support 11 in the above-mentioned photosensor, and the electrode 22 is formed by the same laminating method as described in the above-mentioned photosensor. Provided on top.

As the spacer 16, a resin film of polyester such as polyethylene terephthalate, polyimide, polyethylene, polyvinyl chloride, polyvinylidene chloride, polyacrylonitrile, polyamide, polypropylene, cellulose acetate, ethyl cellulose, polycarbonate, polystyrene, polytetrafluoroethylene, etc. May be used, or may be formed by applying and drying each of the above resin solutions. Also aluminum,
It may be formed by vapor deposition of a metal material such as selenium, tellurium, gold or platinum, or an inorganic or organic compound. The film thickness of the spacer is the gap distance between the optical sensor and the information recording medium,
Since it affects the voltage distribution applied to the information recording layer,
At least 100 μm or less is preferable, and 3 is preferable.
It is good to set it to 30-30 micrometers.

Further, in the information recording apparatus of the present invention, in addition to disposing the optical sensor and the information recording medium with a gap therebetween, the information recording is performed after the insulating dielectric layer is formed on the photoconductive layer of the optical sensor. Layers and top electrodes may be formed.

As a material for forming the dielectric layer, inorganic materials such as SiO ₂ , TiO ₂ , CeO ₂ , Al ₂ O ₃ , GeO ₂ and Si _{3 are used.}
Using N ₄ , AlN, TiN, etc., the film thickness is 0.01 μm to 10 μm by the vapor deposition method, the sputtering method, the chemical vapor deposition (CVD) method, etc.
It may be formed by laminating to a thickness of μm, preferably 0.05 μm to 0.5 μm. Alternatively, a water-soluble resin having a low compatibility with an organic solvent, for example, an aqueous solution of polyvinyl alcohol, water-based polyurethane, water glass, or the like may be used and laminated by a spin coating method, a blade coating method, a roll coating method, or the like. Further, a coatable fluororesin may be used. In this case, it is dissolved in a fluorine-based solvent and coated by a spin coating method, or a blade coating method, a roll coating method or the like to give a film thickness of 0.01 μm. It is advisable to stack the layers to 10 μm, preferably 0.05 μm to 0.5 μm.

As the fluororesin which can be applied, for example, the fluororesins disclosed in JP-A-1-131215 and the like, and organic materials such as polyparaxylylene film-formed in a vacuum system can be preferably used. .

Next, an information recording method in the information recording apparatus of the present invention will be described. FIG. 3 is a diagram illustrating an information recording method using the optical sensor of the present invention. First,
The information recording apparatus of the present invention, as shown in FIG.
2, 22 are connected via a voltage source V. Either one or both of the electrodes 12 and 22 in this device may be transparent. The polarities of the electrodes 12 and 22 are determined according to the polarities of the optical sensor.

First, when the information light 17 is made incident while applying a voltage between the electrodes 12 and 22, the photo carriers generated in the photoconductive layer composed of the charge generation layer 14 and the charge transport layer 15 in the portion where the light is made incident are generated. , Is moved by the electric field formed by both electrodes, the voltage is redistributed, the liquid crystal phase in the information recording layer is oriented, and recording is performed according to the pattern of the information light 17. The voltage may be applied for a predetermined time while the information light 17 is being incident.

Since some liquid crystals have different operating voltages and ranges, when setting the applied voltage and the applied voltage time, the voltage distribution in the information recording medium is set appropriately and the voltage distribution applied to the information recording layer is set to the liquid crystal. It is recommended to set it in the operating voltage range of. This information recording method enables surface analog recording and obtains recording at the liquid crystal level, so that high-resolution recording is achieved, and the exposure pattern is retained as a visible image due to the orientation of the liquid crystal phase.

When recording on the information recording medium, the information recording medium is heated by, for example, resistance heating (not shown) embedded in the support thereof, and the liquid crystal is heated to a temperature exhibiting a liquid crystal phase. The memory property can be improved.

The information recording method includes a camera method and a laser recording method. As a method using a camera, an information recording medium is used instead of a photographic film used in a normal camera, and it is used as a recording member, and an optical shutter can be used and an electric shutter can also be used. It is profitable. Also, the optical information is separated into R, G, and B light components by a prism and a color filter and taken out as parallel light to form one frame with three information recording media for each of R, G, and B, or 1
Color images can also be taken by recording R, G, and B images on different portions of each information recording medium to form one frame.

The laser recording method is as follows.
Argon laser (514.488n)
m), a helium-neon laser (633 nm), a semiconductor laser (780 nm, 810 nm, etc.) can be used,
Laser exposure corresponding to an image signal, a character signal, a code signal, and a line drawing signal is performed by scanning. An analog recording such as an image is performed by modulating the light intensity of the laser, and a digital recording such as a character, a code or a line drawing is performed by ON / OFF control of the laser light. Further, in the case of halftone dot formation in an image, a laser beam is subjected to ON / OFF control of a dot generator.

With respect to the exposure information recorded on the information recording medium, when the information recording medium is separated or the information is reproduced by transmitted light in the state of being integrated, the liquid crystal is oriented in the electric field direction in the information recording section. Therefore, the light is transmitted, while the light is scattered at the part where information is not recorded,
The contrast with the information recording section can be obtained. The information recorded by these information recording devices may be read by reflected light.

The information recorded by the orientation of the liquid crystal is visible information that can be visually read, but it can also be magnified and read by a projector, and transmitted light or reflected light can be read using laser scanning or a CCD. Thus, information can be read with high accuracy, and scattered light can be prevented by using a Schlieren optical system as needed.

The information recording medium in the present invention records electrostatic information in a state of being visualized by the orientation of the liquid crystal. However, by selecting the combination of the liquid crystal and the resin, the information once oriented and visualized can be erased. Instead, the memory property is given. Further, by heating to a high temperature near the isotropic phase transition, the memory can be erased, so that it can be used for recording information again.

The optical sensor of the present invention is suitable for recording information on an information recording medium having a polymer-dispersed liquid crystal as an information recording layer as described above, but other information recording medium, for example, JP-A-4-70842. Japanese Patent Laid-Open No. 4-46347,
An electrostatic information recording medium described in JP-A-3-7942, JP-A-4-73769, etc., which uses an insulating resin layer having an excellent charge retention property such as a fluororesin as an information recording layer, Stores information in the form of electrostatic charge and is toner developed,
An information recording medium capable of reproducing electrostatic information by reading a potential, and Japanese Patent Laid-Open Nos. 3-170985, 3-170984, and 3-192288.
An information recording medium having a thermoplastic resin layer as an information recording layer, which is described in Japanese Patent Application Laid-Open Publication No. 2004-242242, where information is accumulated on the surface in the form of an electrostatic charge in the same manner as above, and then the information is frosted by being heated. It can also be used for information recording on an information recording medium that can be stored as an image and reproduced as visible information.

[0074]

In the photoconductive layer, photo-induced charge carriers (electrons, holes) are generally generated in the irradiated portion when light is irradiated, and these carriers can move in the layer width. It has a function.

FIG. 4 shows a method for measuring the current characteristics of the photosensor. A film with a thickness of 30Å on the charge transport layer of the optical sensor
The u layer was vapor-deposited to serve as an electrode and used as a measuring medium, and a current measuring system as shown in FIG. 8 was constructed. In the figure, 11 is a photosensor support, 12 is a photosensor electrode, 13 is a photoconductive layer consisting of a charge generation layer and a charge transport layer, 30 is a metal electrode, 31 is a light source, 32 is a shutter, 33 is a shutter driver, 34
Is a pulse generator (power supply), and 35 is an oscilloscope.

In this current measuring system, the electrode 12 in the photosensor is positive and the Au electrode is negative.
At the same time as applying a DC voltage of 00 V, light of 20 lux and wavelength of 550 nm from the glass substrate side is 1/30 sec.
Exposed. The voltage application continued for 0.15 sec, and the time change of the current during that period was measured by an oscilloscope. Further, the voltage was applied only without exposure, and the current was measured in the same manner.

In FIG. 5, the horizontal axis represents time, and the vertical axis represents the measurement results showing the time change of the current value after the start of light irradiation. The light irradiation start time was set to t = 0. At this time, the current value at time t = 0 was defined as the dark current value, and the difference between the measured current value and the dark current value was defined as the photocurrent. As illustrated in FIG. 5, in the photosensor of the present invention, the photocurrent increases during the light irradiation and is attenuated after the light irradiation ends, but the photocurrent continues to flow for a sufficiently long time. Therefore, 1 from the start of irradiation with 20 lux of green light
Each photosensor can be compared with the photocurrent value after / 30 seconds (33 ms).

In an amplification type optical sensor having a large dark current value, the larger the dark current value, the larger the photocurrent value tends to be. When such an optical sensor is used in an information recording system, if the dark current value is different, the optical sensor with a larger photocurrent does not always have a higher information forming ability. It is necessary to compare the ratios of.

Further, as shown in FIG. 6, the information forming ability of the optical sensor when the polymer dispersion type liquid crystal medium is used as the information recording medium is as shown in FIG.
(160 pF), a resistance R1 (1000 MΩ), a power supply E, and a voltmeter V can be used for measurement. The capacitor and the resistor correspond to the information recording medium. A voltage of 500 V was applied to this measuring circuit, and at the same time, light of 20 lux (wavelength 550 nm) was exposed from the photosensor side for 1/30 seconds. The voltage application continued for 0.15 seconds. With respect to the voltage applied to the capacitor and the resistance, the relationship between the applied voltage in the exposed portion and the unexposed portion due to the light irradiation and the time is illustrated in FIG. 7, and the applied voltage in the exposed portion and the unexposed portion due to the light irradiation is illustrated. The relationship between the difference and time is illustrated in FIG. Figure 8 shows the increase (△
V) over time. The amount of increase in voltage in FIG. 8 is considered to be information recorded on the information recording medium, and it can be said that the larger ΔV, the higher the performance as an optical sensor. Since the exposed portion has higher conductivity than the unexposed portion, a large voltage is applied to the liquid crystal recording medium, the light transmittance of the exposed portion of the liquid crystal recording medium is increased, and information can be recorded. That is, better image information can be recorded when the potential difference between the exposed portion and the unexposed portion is larger, so that a photosensor having higher sensitivity can be obtained when the potential difference is larger. Further, the liquid crystal recording medium has a threshold value, and it is necessary to compare the potential difference when the potential of the unexposed portion reaches the threshold value of the liquid crystal recording medium.

In this way, when the electric characteristics of the current value and the increase amount (ΔV) of the voltage in the optical sensor of the present invention are measured, the ionization potential of the charge transporting substance is compared with the ionization potential of the charge generating substance. The smaller the
It has been found that the performance of the optical sensor is high and the information recording can be performed with high efficiency when the difference in ionization potential is 0.2 eV or more. You can get a sensor.

[0081]

The present invention will be described below with reference to examples. In the examples, "part" means part by weight and "%" means% by weight.

(Example 1) (Preparation of optical sensor) As a charge generating substance, a structural formula was used.

[0083]

Embedded image

3 parts of the pigment represented by (Ionization potential 5.80 eV), 0.75 parts of vinyl chloride-vinyl acetate copolymer resin [Denka Co., Ltd .: trade name 1000 # D] and 0.25 part of polyvinyl acetate resin. Was added to a mixed solution of cyclohexanone: 1,4 dioxane = 1: 1 (weight ratio) so as to have a solid content of 1.2% and sufficiently dispersed by a ball mill, and then an ITO transparent electrode (film thickness of about 50
0 Å, resistance 80 Ω / sq. Was coated on the electrode of a glass substrate having a) with a blade coater having a gap thickness of 60 μm and dried at 100 ° C. for 1 hour to form a charge generation layer having a thickness of 0.3 μm.

Next, on this charge generation layer, 5 parts of the charge-transporting substance represented by the above-mentioned formula (1) and 1 part of a polystyrene resin [DENKA CORPORATION: trade name HRM-3] were added to dichloromethane: 1,1,2-trichloroethane = 2: 3
After being dissolved in a mixed solvent (weight ratio) so as to have a solid content of 10%, it was applied using a blade coater having a gap thickness of 100 μm, and then dried at 80 ° C. for 2 hours to give a film thickness of 1
A 0 μm charge transport layer was laminated to form an optical sensor.

(Electrical Characteristics of Optical Sensor) The optical sensor prepared above was incorporated into the current measuring system shown in FIG. 4, and current measurement was performed. The obtained dark current value and light irradiation stop (t ₁ ) were measured. The bright current value was defined as the current density during unexposed and exposed (dark current value 10 ⁻⁶ A / cm ² ).

Similarly, the optical sensor manufactured as described above was incorporated in the voltage measuring system shown in FIG. 6, voltage measurement was performed, and the maximum value of the obtained potential difference was taken as the information recording performance (ΔV) of the measuring medium. did.

The ionization potential of the charge-transporting substance is determined by an atmospheric ultraviolet photoelectron analyzer (AC-1: manufactured by Co., Ltd.).
RIKEN Keiki) was used for the measurement.

The results of these measurements are shown in Table 1 below.

(Examples 2-3, Comparative Example 1) Instead of the charge-transporting substance in Example 1, the above formula (2) was used.
~ An optical sensor is produced by using the charge transporting material represented by the formula (3) and the charge transporting material for comparison represented by the following formula (a) in the same manner. It was measured. The results are shown in Table 1 below.

Formula (a)

[0092]

[Chemical 6]

[0093]

[Table 1]

From the above results, it was found that the ionization potential decreased as the basic skeleton (π-electron system) of the charge-transporting substance used for the optical sensor became longer. And
When the ionization potential of the charge transport material is smaller than that of the charge generation layer and the difference is 0.70 eV or more, ΔV of several tens of V was obtained.

It is considered that this is because the current (dark current) at the time of non-exposure increased due to the decrease in the ionization potential of the charge transporting substance, and the amplification effect of the photoinduced current increased.

Although these reasons are not clear, the difference in ionization potential between the charge generation layer and the charge transport layer increases due to the decrease in the ionization potential of the charge transport layer, and a charge transfer complex is formed between the two. It may be because it became easier.

(Creation of Information Recording Medium) ITO having a film thickness of 1000 Å is formed as a conductive layer on a glass substrate having a thickness of 1.1 mm.
A film was formed by a sputtering method to obtain an electrode layer.

On this electrode layer, polyfunctional monomer (dipentaerythritol hexaacrylate, manufactured by Toagosei Kagaku Co., Ltd., M-400) 40 parts photoinitiator (2-hydroxy-2-methyl) -1-Phenylpropane-1-one, Merck & Co., Darocur 1173) ... 4 parts Smectic liquid crystal (Merck & Co. S-6) 90%, nematic liquid crystal (Merck & Co. E31-LV) Liquid crystal consisting of 10% of 50% · Surfactant (Sumitomo 3M, Fluorad FC-430) ··· 3 parts of 50 parts of a coating solution obtained by uniformly dissolving 3 parts in 96 parts of xylene.
After coating with a blade coater having a gap of m, it was dried under reduced pressure at 47 ° C. for 2 minutes, and immediately
The coating film was cured by irradiation with ultraviolet rays of mJ / cm ² to obtain an information recording medium having an information recording layer with a thickness of 6 μm.

(Information Recording Method) Examples 1 to 3 and Comparative Example 1
As shown in FIG. 2, the optical sensor obtained in the above step and the information recording medium produced above were opposed to each other with an air gap of 10 μm provided through a spacer of a polyimide film, and were laminated.

In the information recording system shown in FIG. 3 in which these laminated bodies are incorporated, a DC voltage of 750 V is applied for 0.08 sec between both electrode layers of the optical sensor and the information recording medium, and at the same time, an imaging camera (made by Mamiya Corporation) is used. RB67)
At, the gray scale was projected and exposed from the photosensor side for 1/30 sec. After the exposure, each information recording medium was taken out.

When the information recording medium on which information was recorded using the optical sensors of Examples 1 to 3 was observed by transmitted light, a recording portion composed of a light transmitting portion corresponding to gray scale was observed in the information recording layer. It was

Next, the recorded information on the information recording medium was reproduced by the information output system constructed as shown in FIG. In the figure, 41 is a film scanner, 42 is a personal computer, and 43 is a printer.

The information recording medium is read by a film scanner (LS-3500 manufactured by Nikon) 51 to read the recorded information, and the information is read by a sublimation printer (SP55 manufactured by JVC).
00) was used to output information, and a printed matter corresponding to a gray scale was obtained.

However, when the optical sensor of Comparative Example 1 was used, the liquid crystal in the information recording medium was not oriented and information could not be recorded.

(Examples 4 to 6 and Comparative Example 2) Instead of the charge-transporting substance in Example 1 above, the above formula (4) was used.
~ A charge transporting material represented by the formula (6) and a charge transporting material for comparison represented by the following formula (b) are used in the same manner to prepare an optical sensor, and similarly, the information recording ability thereof is It was measured. The results are shown in Table 2 below. In addition, Example 1
Is also shown at the same time.

Formula (b)

[0107]

[Chemical 7]

[0108]

[Table 2]

From the above results, it can be seen that the ionization potential decreases as the alkyl chain of the substituted dialkylamino group of the charge transporting substance used in the optical sensor becomes longer. The ionization potential of the charge transport material is smaller than that of the charge generation layer, and the difference is 0.39 eV.
In the above cases, a ΔV of several tens of V was obtained.

Further, when information recording was performed in combination with an information recording medium and information was reproduced in the same manner as in Example 1, the same results as in Examples 1 to 3 and Comparative Example 1 were obtained.

(Examples 7 to 8) Instead of the charge-transporting substance used in Example 1, the above-mentioned formulas (7) and (8) were used.
An optical sensor was similarly prepared by using the charge-transporting substance represented by, and its information recording ability was similarly measured. The results are shown in Table 3 below. The results of Example 1 are also shown.

[0112]

[Table 3]

From the above results, it was found that the ionization potential decreased as the number of substituted diethylamino groups in the charge transporting substance used in the optical sensor increased. Then, when the ionization potential of the charge-transporting substance was smaller than that of the charge-generating layer and the difference was 0.26 eV or more, a printed matter having good contrast was obtained.

Further, as in the case of Example 1, when information recording was carried out in combination with an information recording medium and information was reproduced, the same results as in Examples 1 to 3 were obtained.

(Example 9 and Comparative Example 3) Instead of the charge-transporting substance in Example 1, the charge-transporting substance represented by the above formula (9) and the following formula (c) are used. An optical sensor was prepared by using a charge-transporting substance for comparison in the same manner, and its information recording ability was similarly measured. The results are shown in Table 4 below. The results of Example 2 are also shown at the same time.

Formula (c)

[0117]

Embedded image

[0118]

[Table 4]

From the above results, it was found that the ionization potential decreased as the alkyl chain of the substituent dialkylamino group of the charge transporting substance used in the optical sensor became longer and the number of substituents increased. And
When the ionization potential of the charge transport material is smaller than that of the charge generation layer and the difference is 0.65 eV or more, ΔV of several tens of V was obtained.

Further, as in Example 1, information recording was performed in combination with an information recording medium and information was reproduced, and the same results as in Examples 1 to 3 and Comparative Example 1 were obtained.

[Brief description of drawings]

FIG. 1 is a sectional view illustrating an optical sensor of the present invention.

FIG. 2 is a cross-sectional view illustrating an information recording device of the present invention.

FIG. 3 is a diagram illustrating an information recording method using the optical sensor of the present invention.

FIG. 4 is a diagram illustrating a method for measuring electrical characteristics (current characteristics) of the optical sensor of the present invention.

FIG. 5 is an electrical characteristic (current characteristic) of an optical sensor.
It is a figure explaining.

FIG. 6 is a diagram illustrating a method for measuring electrical characteristics (voltage characteristics) of the optical sensor of the present invention.

FIG. 7 is an electrical characteristic (voltage characteristic) of the optical sensor.
It is a figure explaining.

FIG. 8 is an electrical characteristic (voltage characteristic) of the optical sensor.
It is another figure explaining.

FIG. 9 is a diagram for explaining an information reproducing method.

[Explanation of symbols]

Reference numeral 10 ... Photosensor, 11 ... Substrate, 12 ... Electrode, 13 ... Photoconductive layer, 14 ... Charge generation layer, 15 ... Charge transport layer, 16 ...
Spacer, 17 ... Information light, 20 ... Information recording medium, 21 ...
Substrate, 22 ... Electrode, 23 ... Information recording layer, 31 ... Light source, 3
2 ... Optical shutter

Claims (7)

[Claims] 1. In an optical sensor in which an electrode layer is provided on a support, and a charge generation layer and a charge transport layer are sequentially laminated on the electrode layer, the ionization potential of the charge transport material in the charge transport layer is the charge generation. An optical sensor, which is lower than the ionization potential of the charge-generating substance in the layer and has a difference of at least 0.2 ev. 2. The light according to claim 1, wherein the charge-transporting substance is a p-divinylbenzene-based or butadiene-based charge-transporting substance, and the charge-generating substance is a bisazo-based pigment. sensor. 3. An optical sensor comprising an electrode layer provided on a support, and a charge generation layer and a charge transport layer sequentially laminated on the electrode layer, wherein the ionization potential of the charge transport material in the charge transport layer is Information recording in which an optical sensor having a lower ionization potential of the charge generating substance in the charge generating layer and a difference between them is at least 0.2 ev, and an information recording layer capable of forming information by an electric field or an electric charge amount are stacked on the electrode layer. Depending on the information exposure to the information recording medium, the information recording medium is arranged to face the medium or is laminated, and the electrodes are connected so that voltage can be applied, and the information is exposed to the information recording medium with the voltage applied between the electrodes. An information recording device, which enables recording. 4. The optical sensor is semi-conductive in the layer width direction, and is applied between the electrode of the optical sensor and the electrode of the information recording medium by applying a voltage in a state where information is exposed, or in a state where a voltage is applied. By the information exposure, a photo-induced current amplified more than the current caused by the information exposure is generated, and information can be recorded on the information recording medium with an intensity higher than the intensity caused by the information exposure, and the information exposure is completed. 4. The information recording apparatus according to claim 3, wherein the information recording medium exhibits a relaxation-attenuation type conductivity when the voltage is continuously applied after that, and has a function of continuously recording information on the information recording medium. 5. The charge-transporting substance is a p-divinylbenzene-based or butadiene-based charge-transporting substance, and the charge-generating substance is a bisazo-based pigment. Information recording device. 6. When an electric field intensity of 10 ⁵ to 10 ⁶ V / cm is applied to the photosensor, the passing current density in the unexposed portion of the photosensor is 10 ⁻⁴ to 10 ⁻⁷ A / cm ² , The information recording apparatus according to any one of claims 3 to 5, wherein the information recording medium has a specific resistance of 10 ¹⁰ to 10 ¹³ Ω · cm. 7. A photosensor comprising an electrode layer provided on a support, and a charge generation layer and a charge transport layer sequentially laminated on the electrode layer, wherein the ionization potential of the charge transport material in the charge transport layer is Information recording in which an optical sensor lower than the ionization potential of the charge-generating substance in the charge-generating layer and having a difference of at least 0.2 ev and an information recording layer capable of forming information by an electric field or the amount of electric charge are stacked on the electrode layer. A state in which the medium and the medium are arranged so as to face each other on the optical axis with a gap therebetween, or are laminated, and the electrodes of the optical sensor and the electrodes of the information recording medium are connected so that a voltage can be applied, and information is exposed between both electrodes. After the information is recorded on the information recording medium by applying a voltage in the information recording medium or by exposing the information in the state where the voltage is applied, the information recorded on the information recording medium is transmitted or Is an information recording / reproducing method characterized by reproducing as visible information by reflected light.