JPH0850300A - Integral type information recording medium having contact - Google Patents

Abstract

PURPOSE:To surely and easily assure electrical connection with a liquid crystal recording medium by connecting and fixing wirings between both electrodes of an optical sensor and the recording medium. CONSTITUTION:A lower electrode 32 on a photoconductive layer side and an upper electrode 33 on a liquid. crystal/high polymer composite layer side are formed across a recording layer 31 on a base material 30. The lead wires 34, 35 are respectively connected by soldering, etc., to the upper electrode 33 and the lower electrode 32 and on/off with a power source is executed on the free terminal side of these lead wires. The lead wires 34, 35 are connected by soldering to the contact C2 in the region where the recording layer 31 of the lower electrode 32 is etched and the contact C1 on the side laterally opposite to the contact C2 on the upper electrode 33. Then, the contacts are parted from each other and, therefore, shorting of both lead wires 34, 35 is prevented.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an integrated information recording medium in which an optical sensor and a liquid crystal recording medium are laminated and the orientation of the liquid crystal recording medium is changed to record an image, and more particularly to a contact of the recording medium. .

[0002]

2. Description of the Related Art Conventionally, a polymer-dispersed liquid crystal recording medium having a liquid crystal polymer composite layer in which a resin phase and a liquid crystal phase are separated from each other and formed on an electrode, and a photoconductive layer on the electrode layer There is known an integrated information recording medium in which the formed optical sensor is laminated and an image is recorded by voltage application exposure. FIG. 1 shows such an integrated information recording medium. In the figure, 10 is an optical sensor and 20 is a liquid crystal recording medium.
In the optical sensor 10, a transparent electrode 12 and a photoconductive layer 13 are sequentially laminated on a transparent support 11, and a liquid crystal recording medium 20 has a liquid crystal layer having a resin phase and a liquid crystal phase separated on a transparent electrode 22. The molecular complex layer 23 is laminated. The photoconductive layer 13 has a single layer structure such as amorphous selenium or amorphous silicon as an inorganic photoconductive layer, polyvinylcarbazole to which trinitrofluorenone is added as an organic photoconductive layer, or polyvinyl butyral as an azo pigment as a charge generation layer. It is possible to use, for example, a layer in which a charge dispersion layer is dispersed in a resin such as the above and a layer in which a hydrazone derivative is mixed with a resin such as a polycarbonate as a charge transfer layer are laminated. In the integrated information recording medium, as shown in FIG. 1A, a liquid crystal recording medium is directly laminated on an optical sensor, and as shown in FIG. 1B, a transparent dielectric intermediate layer 24 is interposed. There are a transmissive type and a reflective type in which the intermediate layer is a dielectric mirror.

As shown in FIG. 2, when a voltage is applied between the electrodes 12 and 22 of such an integral type information recording medium by a power source 30 and visible light is irradiated as writing light, the photoconductive layer is generated according to the exposure intensity. The conductivity of 13 changes, the electric field applied to the liquid crystal polymer composite layer 23 changes, and the alignment state of the liquid crystal changes, which state is maintained even after the applied voltage is turned off and the electric field is removed. Will be recorded.

[0004]

By the way, the layer thicknesses of the liquid crystal recording medium and the optical sensor are about 6 μm and 10 μm, respectively, and the layer thickness of the entire integrated information recording medium is very thin, less than 20 μm. As described above, the electrical connection of a very thin liquid crystal recording medium has conventionally been performed by clipping the electrodes of the optical sensor and the liquid crystal recording medium, but since the medium is thin and small, the clips interfere with each other, Or it came off and the shooting was very troublesome. Therefore, such electrical connection of the recording medium cannot be applied to a case where the recording medium is loaded into a camera or the like to enable easy photographing.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a contact structure for an integrated information recording medium capable of reliably and easily ensuring electrical connection with the recording medium.

[0006]

The present invention is directed to a liquid crystal recording medium in which a liquid crystal polymer composite layer in which a resin phase and a liquid crystal phase are present in a phase separated state is laminated on an electrode layer, and an electrode on a transparent substrate. Layer, a photosensor having a photoconductive layer formed thereon, and a liquid crystal polymer composite layer and a photoconductive layer are laminated directly or with an intermediate layer interposed, in an integrated information recording medium, wiring is provided on both electrode layers. Is fixedly connected. Further, according to the present invention, a liquid crystal recording medium in which a liquid crystal polymer composite layer in which a resin phase and a liquid crystal phase are present in a phase separated state is laminated on an electrode layer, and an electrode layer and a photoconductive layer are formed on a transparent substrate. In an integrated type information recording medium in which a liquid crystal polymer composite layer and a photoconductive layer are laminated directly or with an intermediate layer interposed, at least one of the electrode layers is mechanically or elastically attached to the optical sensor. It is characterized in that the movable contact is pressed so as to make a point contact, a line contact, or a surface contact.
Further, according to the present invention, a liquid crystal recording medium in which a liquid crystal polymer composite layer in which a resin phase and a liquid crystal phase are present in a phase separated state is laminated on an electrode layer, and an electrode layer and a photoconductive layer are formed on a transparent substrate. In an integrated information recording medium in which an optical sensor and a liquid crystal polymer composite layer and a photoconductive layer are laminated so as to face each other directly or with an intermediate layer interposed, at least one of the electrode layers and a movable contact are brought into contact with each other by magnetic force. The feature is that it is made to do.

[0007]

According to the present invention, wiring is connected and fixed to both electrode layers of the optical sensor of the integrated information recording medium and the liquid crystal recording medium, and at least one of the electrode layers of the recording medium is mechanically or elastically point-contacted. Since the movable contact is pressed so as to make a line contact or a surface contact, and at least one of the electrode layers of the recording medium is brought into contact with the movable contact by magnetic force, the electric connection with the recording medium is surely and easily performed. It becomes possible.

[0008]

FIG. 3 is a view showing an embodiment showing the contact structure of the present invention. The recording medium used is the same as that described with reference to FIGS. The recording layer 31 is provided on the base material 30.
A lower electrode layer 32 on the side of the photoconductive layer and an upper electrode 33 on the side of the liquid crystal polymer composite layer are formed with the interposing therebetween, and lead wires are connected to the upper electrode and the lower electrode by soldering, etc. The terminal side is used to turn on / off the power supply.

In FIG. 3A, the recording layer on the right end side of the base material 30 is etched, and the contact C2 in the region where the recording layer of the lower electrode 32 is etched and the contact C2 on the left and right on the upper electrode 33 are left and right. Lead wires 34 and 35 are connected to the contact C1 on the opposite side by soldering. Since the contacts are separated from each other, it is possible to prevent the lead wires of both from being short-circuited. 3B has the same structure as that of FIG. 3A, but the lower electrode 32 in the portion of the upper electrode facing the contact C1 is further etched, and at the same time, the upper electrode on the side facing the contact C2 is also etched. It is effective in preventing the occurrence of conduction between the contact or wiring and the counter electrode. FIG. 3 (c) shows a case in which lead wires are connected to contacts C1 and C2 which are formed on the back surface of the base material so that both the upper electrode and the lower electrode are formed on the back surface of the base material, and the counter electrode facing the contact is etched. The occurrence of continuity is prevented. 3 (d) is different only in that the underside of the upper electrode is eliminated from FIG. 3 (c), and FIG. 3 (e) is different from that in FIG. 3 (d) only in that the lower electrode is extended. In both cases, conduction is prevented from occurring at the contact points. 3 (f) is different from FIG. 3 (b) only in that the upper electrode is provided on the back surface, and as in FIG. 3 (b), in order to prevent the occurrence of conduction between the contact or wiring and the counter electrode. It is valid. 3 (g) is an upper electrode as compared with FIG. 3 (c),
It is different from the lower electrode in that it is routed to the side surface of the recording medium, and is characterized in that contacts C1 and C2 are formed on the side surface.
However, it is difficult to solder because the recording medium is thin. FIG.
In FIG. 3H, the upper electrode C1 is formed on the upper end and the lower electrode contact C2 is formed on the medium side. In FIG. 3I, the lower electrode contact C2 is the upper surface of the substrate and the upper electrode contact C1 is the medium. It is formed on the side surface of.

FIG. 4 shows an embodiment in which the electrical connection is established by point contact, line contact, or surface contact by mechanical pressure without fixing the contact with the electrode. Figure 4 (a)
An example is shown in which a rod-shaped contact 40 having a spherical tip is screw-fitted and vertically moved by the rotation of the screw 41, and the contact 40 and the lower electrode 32 of the recording medium, which is turned around, are brought into point contact.

In FIG. 4 (b), the contact point that contacts the lower electrode 32 is cylindrical, and the medium is moved up and down by the holder 43 so that the lower electrode 32 and the columnar contact point 42 make a line contact with each other to cause electrical contact. Conduction is achieved. FIG. 5 shows an example in which a contact formed by lowering the lower electrode 32 is pressed by a spring 50 so as to be electrically connected.
Line contact and surface contact will be described.

In FIG. 5A, a spring 50 presses the lower electrode 32 against a spherical contact 51 to make point contact.
In FIG. 5B, the conical contact 52 is point-contacted,
In (c), the point contact at a plurality of points is made possible by the member 53 having the serrated contact. 5D shows the lower electrode elastically pressed into line contact with the cylindrical contact 54, and FIGS. 5E and 5F show the lower electrode 32, the cylindrical body 55, and the plate member 56. The surface contact is made with. Both are pressed by the spring 50 to make point contact, line contact,
The surface contact enables contact or opening at the electrode part of the medium at the time of photographing.

FIG. 6 shows an example in which a magnet is used for electrical connection, and the A electrode and the B electrode are indirectly opened and closed by the magnetic force acting between the magnets N and S. Is. In FIG. 6 (b), ferromagnetic contacts 60 and 62 are provided for each electrode, and these are magnetized so that the contacts can be opened and closed directly by the magnetic force of the contacts themselves.

[Structure and Material Description of Optical Sensor] The photoconductive layer of the optical sensor of the present invention may be composed of a single layer or a laminated body. Here, the laminated optical sensor will be described. To do. FIG. 7 is a cross-sectional view for explaining the laminated photosensor, in which 11 is a substrate, 12 is an electrode, 13 is a photoconductive layer, 13 'is a charge generation layer, and 13' is a charge transport layer. As shown in the figure, the stacked photosensor is formed by sequentially stacking a charge generation layer and a charge transport layer on an electrode, and the charge generation layer 13 'includes a charge generation substance and a binder. Is a pyrylium dye,
Azurenium dye, squarylium salt dye, phthalocyanine pigment, perylene pigment, polycyclic quinone pigment,
Indigo pigments, pyrrole pigments, azo pigments, and other dyes and pigments can be used alone or in combination. Examples of the binder include polycarbonate resin, vinyl formal resin, vinyl acetal resin, vinyl butyral resin, polyester resin, acrylic resin, methacrylic resin, vinyl chloride resin, vinyl acetate resin, vinyl chloride-vinyl acetate copolymer resin and the like. The binder resins may be used alone or in combination of two or more. The mixing ratio of the charge generating agent and the binder is 0.1 to 10 parts by weight, preferably 0.2 to 10 parts by weight of the binder with respect to 1 part by weight of the charge generating agent.
It is desirable to use 1 part by weight. The thickness of the charge generation layer after drying is 0.01 to 1 μm, preferably 0.1 to 0.5 μm, and such a film thickness shows good sensitivity and image quality. In addition, the above-described charge-generating substance that can be vapor-deposited can also be formed alone without using a binder.

The charge-transporting layer 13 "comprises a charge-transporting substance and a binder. The charge-transporting substance is a substance having a good property of transporting the charges generated in the charge-generating layer, and is, for example, oxazole-based, thiazole-based or triazole-based. Phenylmethane-based, styryl-based, stilbene-based, hydrazone-based, carbazole-based, enamine-based, aromatic amine-based, triphenylamine-based, butadiene-based, polycyclic aromatic compound-based, etc., and have good hole transport properties As the binder, the same binders as those in the charge generation layer described above, styrene resin, styrene-butadiene copolymer resin, polyarylate resin, phenoxy resin can be used, but preferably styrene resin, These are styrene-butadiene copolymer resins and polycarbonate resins.
The binder is 0.1 to 1 with respect to 1 part by weight of the charge transport material.
It is desirable to use 0 parts by weight, preferably 0.1 to 1 part by weight. The thickness of the charge transport layer after drying is 1 to
The thickness is 50 μm, preferably 3 to 20 μm. With such a thickness, good sensitivity and image quality can be obtained.

The electrodes 12, it is necessary to have a transparency if opaque later information recording medium, transparent if the information recording medium has a transparency may be either opaque, 10 ⁶ Omega · A material that stably gives a specific resistance of not more than cm, for example, a metal thin film conductive film of gold, platinum, zinc, titanium, copper, iron, tin, tin oxide, indium oxide, zinc oxide,
A metal oxide conductive film such as titanium oxide, tungsten oxide or vanadium oxide, 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 12 is formed by vapor deposition, sputtering or CV.
It is formed by a method such as D, coating, plating, dipping, or 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.
It has a thickness of about 300 nm and is formed over the entire surface between the information recording layer and an arbitrary pattern. Further, two or more kinds of materials can be laminated and used.

The substrate 11 needs to be transparent if the information recording medium described later is opaque, but may be either transparent or opaque if the information recording medium is transparent, such as a card, film, It has a shape of a tape, a sheet, a disk, etc. and strongly supports the optical sensor. For example, a flexible plastic film, a plastic sheet such as glass, polyethylene, polypropylene, polyethylene terephthalate, polymethyl methacrylate, polymethyl acrylate, polyester, polycarbonate, or a rigid body such as a card is used.

If the electrode 12 is transparent, a layer having an antireflection effect may be laminated on the other surface of the substrate on which the electrode 12 is provided, or the antireflection effect may be exhibited. The antireflection property may be imparted by adjusting the thickness of the transparent substrate or by combining the two.

The photoconductive layer contains an electron-accepting substance, a sensitizing dye,
Antioxidants, ultraviolet absorbers, light stabilizers and the like may be added. The electron-accepting substance and the sensitizing dye have the functions of adjusting the base current, stabilizing the base current, and sensitizing. Each is added in an amount of 0.001 to 10 parts by weight, preferably 0.01 to 1 part by weight, relative to 1 part by weight of the photoconductive substance. If it is less than 0.001 part by weight, it does not show any action,
If the amount is more than 0 parts by weight, the image quality is adversely affected.

A photo-induced current amplification layer may be provided between the photosensor electrode and the photoconductive layer.

The photo-induced current amplification layer is provided between the electrode 12 and the photoconductive layer 13 or the charge generation layer 13 '. The detailed reason is unknown, but the current generated by photo induction in the photosensor is The function of amplifying, controlling the charge carrier injecting property from the electrode 12 to the photoconductive layer 13 or the charge generating layer 13 'to control the voltage substantially applied to the information recording medium, and the function of amplifying the light from the electrode 12 Conductive layer 13
Alternatively, it has a function of making charge carrier injecting property into the charge generation layer 13 'uniform and reducing noise and unevenness of information recorded on the information recording medium.

For the photoinduced current amplification layer, the same binders as those used in the charge generation layer described above can be used, and further, soluble polyamide, phenol resin, polyurethane, potiurea, casein, polypeptide, polyvinyl alcohol, polyvinylpyrrolidone. , A maleic anhydride polymer, a quaternary ammonium salt-containing polymer, a cellulose compound and the like can be used, and the binder resins can be used alone or in combination of two or more. Particularly, vinyl formal resin, vinyl acetal resin, and vinyl butyral resin are preferable. The thickness of the photoinduced current amplification layer is preferably 0.01 to 10 μm, preferably 0.3 to 3 μm, and it can be applied by a method such as dip coating, roll coating, spin coating or the like. If it is thinner than 0.01 μm, the effect of reducing image noise is lost, and if it is thicker than 10 μm, injection of charge carriers from the electrode to the charge generation layer is hindered.

If necessary, the photoinduced current amplification layer may include various electron-accepting substances, photoconductive substances, inorganic salts,
Organic salts are added, and the additives can be used alone or in combination of two or more.

These additives are added in a proportion of 0.1 to 1000 parts by mol, preferably 1 to 100 parts by mol, based on 100 parts by mol of the binder resin. Each additive may be used alone or in combination. They can be used in combination, and in particular, it is preferable to use a combination of an electron-accepting compound and an organic photoconductive pigment such as a combination of a substituted benzoquinone and an azo pigment because a large amplifying effect can be obtained.

[Preparation of Laminated Photosensor] An ITO film having a sheet resistance of 80 Ω / port and a film thickness of 100 nm was formed by sputtering on a sufficiently washed glass substrate having a thickness of 1.1 mm to obtain an electrode. The electrode is cleaned with a scrubber cleaning machine (trade name: Plate Cleaner Model 602 Ultratech Co., Ltd.) for 2 seconds of pure water injection, 20 seconds of scrubber cleaning, 15 seconds of pure water rinse, 25 seconds of water removal by high speed rotation, 55 seconds of infrared drying. The washing process was performed twice. A charge generating substance is placed on the electrode and the following structure

[0027]

Embedded image

3 parts by weight of a bisazo pigment having a vinyl chloride-vinyl acetate mixed resin (Denka Vinyl # 1000D manufactured by Denki Kagaku Kogyo and 18,32 manufactured by Aldrich).
5.89J 75:25 mixture with vinyl acetate resin)
1 part by weight was mixed with 98 parts by weight of 1,4-dioxane and 98 parts by weight of cyclohexanone, and sufficiently kneaded with a mixer to obtain a coating solution, which was spun at 1400 rpm,
After coating for 0.4 seconds, after coating, a film is formed on the surface of the coating film, and the coating film surface is left without dust until leveling and drying, and then 1
After drying at 00 ° C. for 1 hour, a charge generation layer having a film thickness of 300 nm was laminated.

On the charge generation layer, the following structure was formed as a charge transporting substance.

[0030]

Embedded image

Butadiene derivative having
-405) 50 parts by weight and 10 parts by weight of styrene-butadiene copolymer resin (Clearene 730L manufactured by Denki Kagaku Kogyo Co., Ltd.) were added to 68 parts by weight of chlorobenzene and 68 parts of dichloromethane.
Parts by weight and 136 parts by weight of 1,1,2-trichloroethane are uniformly dissolved to obtain a coating solution, which is 350 rpm with a spinner.
After coating for 0.4 m, the film is formed on the surface of the film, and the film is left in the windless state until leveling does not occur. After leveling and drying, 80 ° C for 2 hours. An optical sensor according to the present invention having a photoconductive layer having a film thickness of 20 μm, which comprises a charge generation layer and a charge transport layer, is prepared by drying and stacking the charge transport layer. It was aged for 3 days.

[Structure and Material of Information Recording Medium] The information recording medium 20 will be described. First, as an information recording medium in the present invention, a case where the information recording layer is a polymer dispersed liquid crystal is mentioned.

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

As the smectic liquid crystal, a liquid crystal substance exhibiting a smectic A phase such as a cyanobiphenyl type, a sinoterphenyl type, a phenyl ester type in which a terminal carbon group of a substance exhibiting a liquid crystal property is long, and a ferroelectric type, A liquid crystal material exhibiting a smectic C phase used as a liquid crystal,
Alternatively, a liquid crystal substance exhibiting smectic H, G, E, F or the like can be given.

The material for forming the resin particles is, for example, an ultraviolet curable resin that is compatible with the liquid crystal material in the monomer or oligomer state, or a solvent common to the liquid crystal material in the monomer oligomer state. Those having compatibility can be preferably used. Examples of such an ultraviolet curable resin include acrylic acid ester and methacrylic acid ester. In addition, a solvent-soluble thermosetting resin having compatibility with a liquid crystal material and a common solvent,
For example, an acrylic resin, a methacrylic resin, a polyester resin, a polystyrene resin, a copolymer containing these as a main component, an epoxy resin, a silicone resin, or the like may be used.

The ratio of the liquid crystal material to the resin used is such that the liquid crystal content is 10% by weight to 90% by weight, preferably 40% by weight.
It is preferable to use it in an amount of 80% by weight, and if it is less than 10% by weight, the light transmittance is low even if the liquid crystal phase is aligned due to information recording, and if it exceeds 90% by weight, a phenomenon such as liquid crystal bleeding occurs. However, image unevenness is not preferable.

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.
It is preferable that the thickness is in the range of 8 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.

[Production of Information Recording Medium] ITO having a thickness of 100 nm was formed as a conductive layer on a glass substrate having a thickness of 1.1 mm.
After the film was formed by sputtering and the electrode was obtained, the surface was washed.

On this electrode, a polyfunctional monomer (dipentaerythritol hexaacrylate, manufactured by Toagosei Kagaku,
M-400) 40 parts by weight, photo-curing initiator (2-hydroxy-2-methyl-1-phenylpropan-1-one,-
Ciba Geigy, Darocure 1173) 2 parts by weight, liquid crystal 50 parts by weight (90% of smectic liquid crystal (Merck S-6), nematic liquid crystal (Merck),
10% of E31LV), 3 parts by weight of a surfactant (Sumitomo 3M, Florard FC-430) in xylene 9
The coating solution obtained by uniformly dissolving in 6 parts by weight was coated using a blade coater having a gap of 50 μm, dried at 47 ° C. for 3 minutes, and then dried at 47 ° C. for 2 minutes under reduced pressure. Immediately, the coating film was cured by irradiation with 0.3 J / cm ² of ultraviolet rays to obtain an information recording medium having an information recording layer having a film thickness of 6 μm.

After the liquid crystal was extracted from the information recording layer surface with hot methanol and dried, the internal structure was observed with a scanning electron microscope (S-800 manufactured by Hitachi, Ltd.) at a magnification of 1000. It is covered with a UV-curable resin of 0.6 μm and has a particle size of 0.1 in the liquid crystal phase forming a continuous layer inside the layer.
It had a structure filled with a resin particle phase of μm.

[Structure and Material of Integrated Type Intermediate Layer] FIG.
FIG. 1 is a sectional view showing an example of an information recording system of the present invention, in which 21 is a substrate, 22 is an electrode, 23 is an information recording layer,
Reference numeral 24 is a dielectric layer, and the same reference numerals as those in FIG. 2 indicate the same contents.

In this information recording system, the optical sensor and the information recording body are directly laminated, or the optical sensor and the information recording body are arranged opposite to each other in the information recording system. It is directly laminated through. This information recording system is particularly suitable when the photoconductive layer in the optical sensor is formed by coating using a solvent, and when the information recording layer is directly formed by coating on the photoconductive layer, the information recording is caused by their interaction. Which can prevent image unevenness due to liquid crystal elution in the above or the photoconductive material being eluted due to the solvent for forming the information recording layer, and also enables integration of the optical sensor and the information recording medium. Is.

In forming the dielectric layer 24, it is necessary that the dielectric layer 24 is insoluble in neither the photoconductive layer forming material nor the information recording layer forming material, and it has conductivity. It is necessary not to. In the case of having conductivity, the space charge is diffused and the resolution is deteriorated, so that the insulating property is required. Further, the dielectric layer lowers the distribution voltage applied to the liquid crystal layer or deteriorates the resolution. Therefore, it is preferable that the film thickness is thin, and it is preferable that the film thickness be 2 μm or less. In addition to the generation of image noise due to various interactions, there is a problem of penetration due to defects such as pinholes in the multilayer coating. The penetrability due to defects such as pinholes depends on the solid content ratio of the material to be laminated and coated, the type of solvent, and the viscosity, so the film thickness of the laminated coating is set appropriately, but at least 10 μm
The following film thickness is preferable, and 0.1 to 3 μm is preferable. Further, in consideration of the voltage distribution applied to each layer, it is preferable to use a material having a high dielectric constant as well as a thin film.

As a material for forming the dielectric layer, inorganic materials such as SiO ₂ , TiO ₂ , CeO ₂ , Al ₂ O ₃ and Ge are used.
_{O 2, Si 3 N 4,} AiN, TiN, MgF 2, ZnS, a combination of a titanium dioxide silicon dioxide, a combination of zinc sulfide and magnesium fluoride, using a combination of aluminum oxide and germanium, evaporation, sputtering , Chemical vapor deposition (C
It may be formed by stacking by the VD) method or the like. 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, and in this case, it may be dissolved in a fluorine-based solvent and applied by a spin coating method, or may be laminated by a blade coating method, a roll coating method or the like.

As the fluororesin which can be applied, for example, the fluororesin disclosed in JP-A-4-24722,
Furthermore, organic materials such as polyparaxylylene and polyvinyl alcohol, which are film-formed in a vacuum system, can be preferably used.

As described above, as the information recording medium, the recording by the information exposure is 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 the visualized information can be erased. Instead, a memory property can be provided. Further, by heating to a high temperature near the isotropic phase transition, the memory property can be erased, so that it can be used for information recording again.

[Photo-induced Current Amplification Function of Optical Sensor] In the optical sensor of the present invention, the electric field or the amount of electric charge applied to the information recording medium at the time of irradiating the optical sensor with light is amplified with the irradiation of light, and If the voltage is continuously applied even after the irradiation is finished, the increased conductivity is sustained by relaxation decay,
It has the function of continuously applying the electric field or the amount of charge to the information recording medium.

The photo-induced current amplifying action in the optical sensor of the present invention will be described in detail. In an optical sensor in which an ITO electrode is provided on transparent glass and a photoconductive layer is laminated on the electrode as an optical sensor for measuring amplification effect, a gold electrode of 0.16 cm ² is laminated on the photoconductive layer. And
A constant DC voltage is applied between the two electrodes with the ITO electrode as a positive electrode, and light is irradiated for 0.033 seconds on the substrate side 0.5 seconds after the start of voltage application, and the behavior of the current value in the photosensor during the measurement time is measured. The measurement is performed from the start of light irradiation (t = 0). The irradiation light is a xenon lamp (L2274 manufactured by Hamamatsu Photonics) as a light source, and green light (manufactured by Nippon Vacuum Optical Co., Ltd.) is used to select and irradiate the edge light, and the irradiation light intensity is measured by an illuminance meter (manufactured by Minolta). Measured at 20 lux. FIG. 9 shows the filter characteristic.

When irradiated with light at this light intensity, a transparent substrate,
Considering the light transmittance of the ITO film and the spectral characteristics of the filter, 4.2 × 10 ¹¹ photons / cm ² seconds are incident on the photoconductive layer. When all the incident photons are converted into photocarriers, theoretically, a current of 1.35 × 10 ⁻⁶ A / cm ² is generated as a photocurrent per unit area.

Here, in the case of measuring with the measuring device, the ratio of the photo-induced current actually generated in the photosensor to the theoretical photocurrent (photo-induced current value actually generated in the photosensor / theoretical The photocurrent value) is defined as the quantum efficiency of the photosensor. The photo-induced current is the current value of the light irradiation part minus the base current value, which is the current flowing in the part not irradiated with light, and is caused by light irradiation above the base current during or after light irradiation. It means that a current flows, which is different from so-called photocurrent. The photoinduced current amplification action in the photosensor of the present invention is defined as such behavior of photoinduced current.

An optical sensor having a photo-induced current amplifying action and an optical sensor having no photo-induced current amplifying action (hereinafter referred to as a comparative sensor) according to the present invention will be described using the measurement results of the measuring device. . First, the measurement results of the comparative sensor are shown in FIG. In FIG. 10, line (m) is a reference line showing the theoretical value (1.35 × 10 ⁶ A / cm ² ), and light irradiation was performed for 0.033 seconds, and voltage application was continued after light irradiation. Indicates. Line (n) is a measured line of an optical sensor that does not have a photoinduced current amplification effect, and the increase in photocurrent during light irradiation is small, and its value is also a theoretical value (1.35 × 10 ⁶ A /
cm ² ) and the quantum efficiency in this comparative sensor is constant at approximately 0.4. The change in quantum efficiency during light irradiation in this comparative sensor is as shown in FIG.

On the other hand, in the photosensor of the present invention, as an example, as shown in FIG. 12, the photo-induced current is increased during light irradiation. The line (m) is the theoretical value (1.35 × 10 ⁶ A
/ Cm ² ). The quantum efficiency of this optical sensor is as shown in FIG. 13, and as is clear from this, it can be seen that the quantum efficiency exceeds 1 in about 0.01 seconds and continues to increase thereafter. Further, in the comparative sensor, the photocurrent abruptly attenuates at the same time as the light irradiation is completed, so that even if the voltage is continuously applied after the light irradiation, the effective current as the light information cannot be obtained. On the other hand, in the photosensor of the present invention, the photoinduced current continues to flow by continuing the voltage application even after the light irradiation, and the photoinduced current can be subsequently taken out to continuously obtain the optical information. You can

[Semiconductivity of Optical Sensor] The optical sensor of the present invention is semiconductive as a whole element, and the specific resistance in the dark is 10 ⁹ to 10 ¹³ Ω · cm because of the density of the flowing current. Is preferred. Particularly, the specific resistance is 10 ¹⁰ to 10 ¹¹ Ω · cm
The amplification effect is remarkable in the range of. Resistivity is 10 ¹³
For optical sensors larger than Ω · cm, 10 ⁵ to 10 ⁶ V /
In the electric field strength range of cm, it does not exhibit the amplifying action as in the optical sensor of the present invention. Further, in an optical sensor having a specific resistance of less than 10 ⁹ Ω · cm, a large amount of current flows, and noise due to the current is likely to occur, which is not preferable.

On the other hand, the photosensitive element used for general electrophotography has a dark resistivity of 10 ¹⁴ to 10 ¹⁶ Ω · c.
m is used, the sensor of the present invention cannot achieve its purpose in electrophotography, and a photosensor having a photoconductive layer having a large dark resistivity for electrophotography is generally used. It cannot be used for the purposes of the invention.

Further, when the information recording layer in the information recording medium is a polymer dispersed liquid crystal, it is necessary to set the sensitivity of the optical sensor in the operating voltage region of the liquid crystal.

That is, the contrast voltage, which is the difference between the potential (bright potential) applied to the information recording medium in the exposed portion and the potential (dark potential) applied to the information recording medium in the unexposed portion, is the contrast voltage in the information recording medium. It is necessary to have a certain size in the operating voltage region of the liquid crystal.

Therefore, for example, the dark potential applied to the liquid crystal layer in the unexposed portion of the photosensor needs to be set to about the operation start potential of the liquid crystal. Therefore, when the resistivity of the information recording medium is 10 ¹⁰ to 10 ¹³ Ω · cm at room temperature and the electric field of 10 ⁵ to 10 ⁶ V / cm is applied to the optical sensor,
The conductivity is required to the extent that a base current of 0 ⁻⁴ to 10 ⁻⁷ A / cm ² is generated, and the range of 10 ⁻⁵ to 10 ⁻⁶ Acm ² is preferable.

In an optical sensor having a base current of less than 10 ^-7 A / cm ² , the liquid crystal layer is not aligned even in an exposed state, and 10 ^-4
In an optical sensor with a base current of A / cm ² or more, a large amount of current flows at the same time as voltage application even in the unexposed state, and the liquid crystal is aligned, and even if exposed, no difference in transmittance can be obtained between the exposed portion and the unexposed portion. . In addition, since there are some liquid crystals having different operating voltages and ranges, it is necessary to consider the voltage distribution in the information recording medium when setting the applied voltage and the voltage application time.

[0059]

As described above, according to the present invention, when the integrated information recording medium is incorporated in a camera or the like, electrical connection with a thin recording medium can be easily and surely ensured and commercialized. It is extremely effective in dealing with.

[Brief description of drawings]

FIG. 1 is a diagram illustrating an integrated liquid crystal recording medium.

FIG. 2 is a diagram illustrating an image exposure method for an integrated liquid crystal recording medium.

FIG. 3 is a diagram showing one embodiment showing a contact structure of the present invention.

FIG. 4 is a diagram showing an example in which electrical connection is made by mechanical pressure.

FIG. 5 is a diagram showing an example in which a contact is formed by lowering a lower electrode.

FIG. 6 is a diagram showing an example in which a contact is formed by using a magnetic force.

FIG. 7 is a diagram illustrating a laminated photosensor.

FIG. 8 is a diagram showing an example in which an optical sensor and an information recording body are directly laminated with a dielectric layer interposed.

FIG. 9 is a diagram showing filter characteristics.

FIG. 10 is a diagram showing a measurement result of a comparative sensor.

FIG. 11 is a diagram showing quantum efficiency characteristics.

FIG. 12 is a diagram showing a current change of an optical sensor according to the present invention.

FIG. 13 is a diagram showing a quantum efficiency characteristic of an optical sensor.

[Explanation of symbols]

31 ... Recording device, 32 ... Lower electrode, 33 ... Upper electrode, 3
4, 35 ... Lead wire, C1, C2 ... Contact, 40 ... Rod-like contact, 41 ... Screw, 42 ... Cylindrical contact, 43 ... Holder, 5
0 ... Spring, 60, 62 ... Ferromagnetic material contact.

Claims (3)

[Claims] 1. A liquid crystal recording medium in which a liquid crystal polymer composite layer in which a resin phase and a liquid crystal phase are present in a phase separated state is laminated on an electrode layer, and an electrode layer and a photoconductive layer are formed on a transparent substrate. In an integrated information recording medium in which an optical sensor is laminated directly or with an intermediate layer interposed so that the liquid crystal polymer composite layer and the photoconductive layer face each other, wiring is connected and fixed to both electrode layers. An integrated information recording medium having a characteristic contact point. 2. A liquid crystal recording medium in which a liquid crystal polymer composite layer in which a resin phase and a liquid crystal phase are present in a phase-separated state is laminated on an electrode layer, and an electrode layer and a photoconductive layer are formed on a transparent substrate. In an integrated type information recording medium in which a liquid crystal polymer composite layer and a photoconductive layer are laminated directly or with an intermediate layer interposed, at least one of the electrode layers is mechanically or elastically attached to the optical sensor. An integrated information recording medium having a contact characterized in that a movable contact is pressed so as to make a point contact, a line contact, or a surface contact. 3. A liquid crystal recording medium in which a liquid crystal polymer composite layer in which a resin phase and a liquid crystal phase are present in a phase separated state is laminated on an electrode layer, and an electrode layer and a photoconductive layer are formed on a transparent substrate. In an integrated information recording medium in which an optical sensor and a liquid crystal polymer composite layer and a photoconductive layer are laminated so as to face each other directly or with an intermediate layer interposed, at least one of the electrode layers and a movable contact are brought into contact with each other by magnetic force. An integrated information recording medium having a contact characterized by the above.