JP2892059B2 - Laminated information recording medium and information recording method - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a laminated information recording medium and an information recording method for recording information electrostatically by voltage application exposure or the like.

[Conventional technology]

Conventionally, silver halide photography has been known as a high-sensitivity photographing technique. In this silver halide photography, a photographed image is recorded on a film or the like through a development process, and the recorded image is reproduced on a photographic paper or the like using a silver halide emulsion or developed film is used. It is performed by optical scanning and reproduction on a cathode ray tube (CRT).

In addition, as an electrophotographic technique, an electrode is deposited on a photoconductive layer, an electrostatic latent image is optically formed on the surface of the photoconductive layer, and the residual electrostatic charge has a charge of the opposite polarity or a charge of the same polarity. There is one that develops by attaching toner. The electrostatic latent image is charged over the entire surface of the photoconductive layer by corona charging in a dark place, and then exposed to intense light to make the photoconductive layer conductive at the site where the light is applied, thereby leaking the charge at the site. It is formed by removing. This is mainly used for copying, and generally cannot be used for photographing because of low sensitivity. In general, toner is developed immediately after forming an electrostatic latent image because of a short electrostatic charge retention time.

Also, as a TV shooting technique, image information obtained by shooting with an imaging tube and using an optical semiconductor is taken out as an electric signal and output as it is on a CRT, or video recording using magnetic recording etc., and CRT at any time, There is a method such as outputting an image on the top.

[Problems to be solved by the invention]

However, silver halide photography is excellent as a means for preserving a subject image, but requires a development process to form a silver halide image, and in image reproduction, hard copy, soft copy (CRT output), etc. Complex optical, electrical,
Or chemical treatment is required.

Electrophotographic technology makes it easier to visualize the resulting electrostatic latent image than silver halide photography, but the storage time of the latent image is extremely short, and the dissociation of developer and image quality are less than that of silver halide. Inferior.

In the TV photographing technique, line-sequential scanning is required to extract and record an electric image signal obtained by an image pickup tube. In addition, line-sequential scanning is performed by an electron beam in the image pickup tube and by a magnetic head in video recording. However, the resolution depends on the number of scanning lines. to degrade.

In addition, a TV imaging system using a solid-state imaging device (CCD or the like), which has been developing in recent years, has essentially the same resolution as described above.

The problems built into these technologies are that if the image recording is of high quality and high resolution, the processing steps are complicated, and if the steps are simple, there is a lack of storage function or basic deterioration of image quality.

The present invention is to solve the above problems,
It is an object of the present invention to provide a laminated information recording medium and an information recording method which have high quality, high resolution, simple processing steps and long-term storage.

[Means for solving the problem]

For this purpose, in the laminated information recording medium of the present invention, a photoconductive layer and a charge holding layer are arranged with a pair of electrodes interposed therebetween, and an electrostatic latent image formed by voltage application exposure is formed between the charge holding and the electrodes. It is characterized in that it is peeled off and held on the surface of the charge holding layer. Further, the information recording method is such that a photoconductive layer and a charge holding layer are disposed across a pair of electrodes, and a voltage is applied between the electrodes of the laminated information recording medium, and the electrodes are grounded. The electrode is separated from the charge holding layer, the charge on the electrode side is left on the charge holding layer side by stripping discharge, and an electrostatic latent image is held on the surface of the charge holding layer by uniform exposure.

[Action]

In the laminated information recording medium and the information recording method of the present invention,
Since the photoconductive layer and the charge holding layer are arranged with the pair of electrodes interposed therebetween, an electrostatic latent image can be formed on the charge holding layer side without the intervention of an air layer by voltage application exposure. Sensitivity exposure becomes possible. In addition, when the electrode is separated from the charge holding layer, the charge accumulated on the electrode side due to the peeling discharge can be left on the charge holding layer side. Therefore, the electrostatic latent image formed by the voltage application exposure is formed on the surface of the charge holding layer. Can be held.

〔Example〕

 Hereinafter, embodiments will be described with reference to the drawings.

FIG. 1 is a view showing one embodiment of a laminated information recording medium according to the present invention, and FIG. 2 is a view for explaining a method of recording information on a laminated information recording medium. In the figure, 1 and 6 are supports, 2 and 5 are electrodes, 3 is a charge retention layer, 4 is a photoconductive layer, 7
Denotes a release layer, and 8 denotes a power supply.

Assuming that the laminated information recording medium according to the present invention is to be exposed from the support 6 side as shown in FIG.
A transparent electrode 5 made of TO (indium tin oxide) is formed, and a photoconductive layer 4 and a charge holding layer 3 of about 10 μm, an Al electrode 2 of about 1000 °, and a glass support 1 of about 1 mm are further formed thereon. It is formed. The photoconductive layer 4
In a dark place, a high resistance body is used. However, when light enters, a portion where the light enters shows conductivity. Therefore,
Exposure by applying a voltage between electrodes 2 and 5 (voltage application exposure)
Then, one of the photocarriers generated in the photoconductive layer 4 moves to the charge holding layer 3 side. The electrode 2 is made of a releasable material. A voltage is applied between the electrodes 2 and 5 to form an electrostatic latent image by exposing the image to form an electrostatic latent image. Save. That is, a separation layer 7 is formed between the electrode 2 and the charge holding layer 3, and the electrode is separated from the charge holding layer 3, so that the charge accumulated in the electrode 2 is held by the separation discharge between the charge holding layer 3 and the charge. The charge retaining layer 3 is left in the layer 3.
To store an electrostatic latent image by accumulating charge on the surface of the device.

Next, a method for recording information on the laminated information recording medium will be described.

When recording information on the above-mentioned laminated information recording medium shown in FIG. 1, first, as shown in FIG.
A power source 8 is connected between the terminals 5 and 5, and a voltage is applied to perform image exposure.
As a result, photocarriers are generated from the electrode 5 on the photoconductive layer 4 in the exposed portion of the photoconductive layer 4, and charges having the opposite polarity to the electrode 2 are attracted to the electrode 2 on the charge holding layer 3 side, and Pass through. Then, when the charge reaches the surface of the charge holding layer 3, the movement is stopped, and the injected charge is accumulated at the site.

When the exposure is completed, as shown in FIG.
And 5 are shorted and grounded. Due to this grounding and short circuit, only the charges corresponding to the injected charges accumulated on the surface of the charge holding layer 3 remain on the electrodes 2 and 5.

Next, as shown in FIG.
Peel from At the time of this peeling, a peeling discharge occurs between the electrode 2 and the charge holding layer 3, and the charges accumulated in the electrode 2 remain on the surface of the charge holding layer 3.

Finally, as shown in FIG. 3D, uniform exposure is performed, and the charge holding layer 3 and the photo carrier formed by the photoconductive layer are used.
A part of the accumulated charges between the photoconductive layers 4 is canceled, and the charges are accumulated only on both surfaces of the charge holding layer 3.

In addition, after performing uniform exposure by reversing the order of FIGS. 4D and 4C, a process may be performed such that the electrode 2 is separated from the charge holding layer 3.

As described above, the information recording method using the laminated information recording medium according to the present invention is of a charge retention type of surface charge, and the charge retention layer 3 is provided between the electrodes 2 and 5 regardless of the discharge via the air layer.
And the photoconductive layer 4 are laminated to form an electrostatic latent image by applying a voltage to form an electrostatic latent image, so that highly sensitive information recording can be performed even with exposure using a low applied voltage of about 100 V to 300 V. Therefore, the recording state can be stably stored without degradation in resolution due to the air layer.

When this recording method is a planar analog recording, high resolution can be obtained as in the case of the silver halide photography, and the surface charges on the charge holding layer 3 to be formed are exposed to the air environment. Because it has insulation performance, it can be stored for a long time without discharging regardless of the light place or dark place.

Further, the charge storage period on the charge retention layer 3 is determined by the properties of the insulator, and the charge trapping characteristics of the insulator affect the properties of the insulator in addition to the insulating properties of air. In the above description, the surface charge is described, but the injected charge may simply accumulate on the surface, microscopically penetrate into the vicinity of the insulator surface, and electrons or holes are trapped in the structure of the substance. Storage for a long period of time. Further, the surface of the charge holding layer 3 may be covered and held with an insulating film or the like in order to prevent physical damage of the charge holding medium or discharge when the humidity is high.

The charge holding layer 11 is made of a high-insulating polymer material in order to suppress the movement of charges, and has a specific resistance of 10 ¹⁴ Ω.
・ It is required to have insulation properties of not less than cm. As the polymer material constituting the charge retention layer, it is necessary that the glass transition temperature is equal to or higher than the use environment temperature, but in a normal use environment, the glass transition temperature is 20 ° C to 100 ° C or more. It is desirable to have.

As polymer materials, phenolic resin, furan resin,
Xylene / formaldehyde resin, ketone / formaldehyde resin, urea resin, melamine resin, aniline resin,
Alkyd resin, unsaturated polyester resin, epoxy resin, triacyl cyanurate resin, formaldehyde resin of tris (2-hydroxyethyl) isocyanurate, acrolein resin, phosphonitrile dihalide polymer derivative, cured resin with dimaleimide, cyclopentadiene Thermosetting resin, crosslinking reaction product by cyclic urea resin, thermosetting resin such as triazine resin,
In addition, polyethylene, ethylene-vinyl acetate copolymer, ethylene-ethyl acrylate-ethylene-methyl acrylate copolymer, polypropylene, polybutylene, methylpentene resin, polystyrene, polyparaxylylene, polyvinyl acetate, polyacrylate, polymethacrylate , Vinyl chloride resin, polyvinylidene chloride, fluorine resin, polyacrylonitrile, polyvinyl ether, polyvinyl ketone,
Thermoplastic resins such as polyethers, polycarbonates, thermoplastic polyesters, polyamides, diene plastics, and polyurethane plastics; and heat-resistant polymers such as aromatic polyamides, polyphenylene, polyxylylene, polyphenylene oxide, polysulfone, and aromatic heterocyclic polymers. Silicone resin, inorganic plastic, natural rubber plastic, cellulosic plastic, protein plastic, plastic from starch, etc. can be used, and materials with insulation resistance of 10 ¹⁴ Ωcm or more are used. is there.

Preferred examples of the fluorine resin include, for example, polytetrafluoroethylene, fluorinated ethylene propylene, tetrafluoroethylene-perfluoroalkyl vinyl ether copolymer, polyether ether ketone resin, and polyparaxylylene.

As a method for forming the charge holding layer, the above resin is coated on an electrode, formed by dipping, vapor deposition, sputtering, or the like, and is formed by attaching a film made of the above resin to the electrode via an adhesive or the like. It may be formed. Conversely, an electrode layer may be formed on one side of the film by vapor deposition, sputtering, coating, or the like. In this case, a layer for protecting the electrode layer may be provided. If further mechanical strength is required, a film or the like having higher mechanical strength may be attached.

Further, since the laminated information recording medium according to the present invention records information on the charge holding layer as a distribution of electrostatic charges as described above, it takes various shapes depending on the information to be recorded or the recording method. be able to. For example, when used for an electrostatic camera (Japanese Patent Application No. 63-121591 filed by the same applicant), it takes the form of a general film (for single frame or continuous frame) or disk shape, and digital information or analog data using a laser or the like. When information is recorded, it takes the form of a tape, a disk, or a card.

The support strongly supports the laminated information recording medium, and the material and thickness are not particularly limited as long as the support has a certain strength capable of supporting the charge holding layer. A rigid body such as a flexible plastic film, metal foil, paper, glass, a plastic sheet, or a metal plate (which can also serve as an electrode) is used, and light transmittance may be similarly required. Specifically, when the charge holding medium takes the form of a flexible film, tape, or disk, a flexible plastic film is used, and when strength is required, a rigid sheet or inorganic material such as glass is used. Materials and the like are used.

The electrode is not limited as long as the specific resistance value is 10 ⁶ Ω · cm or less, and is an inorganic metal conductive film, an inorganic metal oxide conductive film, an organic conductive film such as a quaternary ammonium salt, or the like. Such an electrode is formed on the support by a method such as vapor deposition, sputtering, CVD, coating, plating, dipping, and electric field polymerization. Further, the film thickness needs to be changed depending on the electric characteristics of the material constituting the electrode and the applied voltage at the time of recording information.
It is about 3000 °, and is formed on the entire surface between the support and the charge holding layer or in accordance with the formation pattern of the charge holding layer.

When light transmittance is required, it is preferable to provide an antireflection effect by providing an antireflection film, adjusting the thickness of each of the electrode layer and the charge holding layer, or combining the both. .

As a method for inputting information to the laminated information recording medium of the present invention, there are a method using a high-resolution electrostatic camera and a recording method using a laser. In the case of the method using a high-resolution electrostatic camera, a recording member is constituted by a laminated information recording medium instead of a photographic film used in a normal camera. A voltage is applied to both electrodes to make the photoconductive layer conductive according to incident light, and an electrostatic latent image is formed on the charge holding layer according to the amount of incident light. A mechanical shutter can also be used. ,
An electric shutter can also be used, and the electrostatic latent image can be held for a long time regardless of a bright place or a dark place.

In addition, using a color filter that separates optical information into R, G, and B components by a prism and takes out as parallel light, one frame is formed by three sets of laminated information recording media separated into R, G, and B, Or R, G, B on one plane
By arranging the images to form one frame in one set, color imaging can be performed.

As a recording method using a laser, an argon laser (514.488 nm), a helium-neon laser (633 nm), a semiconductor laser (780, 810 nm, etc.) can be used as a light source, and an image signal, a character signal, a code signal, a line drawing signal can be used. The corresponding laser exposure is performed by scanning. Analog recording such as images is performed by modulating the laser light intensity, and digital recording such as characters, codes, and line drawings is performed by ON-OFF control of laser light. In the case where halftone dots are formed in an image, the dots may be formed by performing dot generator ON-OFF control on laser light. Note that the spectral characteristics of the photoconductive layer need not be panchromatic, as long as they have sensitivity to the wavelength of the laser light source.

〔The invention's effect〕

As is apparent from the above description, according to the present invention, since the photoconductive layer and the charge holding layer are laminated between the electrodes and the voltage is applied and the exposure is performed, the electrostatic discharge is performed without performing the discharge through the air layer. A latent image can be formed, and high-sensitivity exposure can be performed with a low applied voltage. In addition, the resolution is not deteriorated due to the air layer.

[Brief description of the drawings]

FIG. 1 is a view showing one embodiment of a laminated information recording medium according to the present invention, and FIG. 2 is a view for explaining a method of recording information on a laminated information recording medium. 1 and 6 support, 2 and 5 electrodes, 3 charge retaining layer, 4 photoconductive layer, 7 release layer, 8 power supply.

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) G03G 13/05 G03G 15/05 G03G 5/02

Claims (2)

(57) [Claims] 1. A photoconductive layer having a specific resistance of 10 across a pair of electrodes.
A charge holding layer using a polymer material having an insulating property of ¹⁴ Ωcm or more is disposed, a separation layer is provided between the charge holding layer and the electrode, and an electrostatic latent image formed by voltage application exposure is charged. A laminated information recording medium, characterized in that the holding layer and the electrode are separated from each other and held on the surface of the charge holding layer. 2. A photoconductive layer having a specific resistance of 10 across a pair of electrodes.
^A voltage is applied between the electrodes of a laminated information recording medium in which a charge holding layer made of a polymer material having an insulating property of ¹⁴ Ωcm or more is applied, and exposure is performed. A layer-type recording medium characterized in that an electrode is peeled off from the electrode, the charge on the electrode side is left on the charge holding layer side by peeling discharge, and an electrostatic latent image is held on the surface of the charge holding layer by uniform exposure. Information recording method used.