JPH02277067A - Recording display device - Google Patents

Abstract

PURPOSE:To obtain a high contrast by laminating a dielectric layer on the surface of a reflecting layer formed by dispersing reflective fine particles into a resin essentially consisting of polyamide as an image holding member and forming the reflecting layer to have the electric resistance smaller than the electric resistance of the dielectric layer. CONSTITUTION:The diffusion reflecting layer 2 and the dielectric layer 3 are laminated on one surface of a conductive base 1. The reflecting layer 2 is decreased in the ruggedness existing on the surface of the diffusion reflecting layer 2 by dispersing the reflective fine particles into the polyamide, by which the decrease in the contrast is lessened. Since the distribution uniformity of the reflective fine particles and the polyamide is improved, the electrical uniformity is improved and the light reflection is uniformized, by which the whiteness is improved. While the volume resistivity of the dielectric layer 3 is >=10<12>OMEGA.cm, the volume resistivity of the polyamide of the reflecting layer is as low as 10<12-14>OMEGA.cm and, therefore, the removal of the impressed voltage used for the recording is uniformly executed. The previous history is thereby easily erased and the memory is eventually decreased. An improvement in image quality is thus resulted.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to an apparatus in which conductive colored fine powder is fixed by electric adsorption force, thereby recording and displaying.

[Conventional technology]

CRT display devices have traditionally been used as electrical display devices.

Liquid crystal display devices 9 Light emitting diode display devices, fluorescent display devices, plasma display devices, electrochromic display devices, etc. are well known, but displaying on a large screen requires advanced technology, is difficult, and is extremely expensive. It has various disadvantages, such as a decrease in definition, and flickering of the display, which causes severe visual fatigue.

Therefore, several new display devices have been proposed to replace these display devices.

For example, a device that uses a photoconductive layer to electrically adsorb conductive colored magnetic fine powder at the same time as exposure (Japanese patent application No. 56)
-197410), a device that forms an electric latent image on a dielectric material using a pin electrode, etc., and displays it by electrically adsorbing insulating colored fine powder (Utility Model Application No. 57-55061).
Alternatively, a device that electrically adsorbs and displays conductive colored magnetic fine powder on a dielectric material using a pin electrode, etc. (Japanese Patent Publication No. 51-467
No. 07), a device that displays conductive colored magnetic fine powder using magnetic attraction force using an easily magnetizable stylus.

In principle, the above-mentioned devices are capable of high-precision display, can be displayed on a large screen easily and inexpensively, and because they are displayed using colored fine powder, the displayed image does not flicker and has excellent visual acuity. It has attracted attention due to its advantages such as relatively little fatigue.

However, on the other hand, it has not been put into practical use because it is insufficient in terms of high contrast, long life, stability under low environmental conditions, and high reliability required for display devices. Among them, a record display method as shown in FIG. 3 will be explained. A cylindrical magnet 9 is rotated within the non-magnetic cylinder 10, and the colored conductive colored magnetic fine powder 8 is conveyed over the non-magnetic cylinder 10 to be densely distributed along the axial direction onto the non-magnetic cylinder 10. It passes over the arrayed needle-like recording electrodes. Thus, a voltage is applied between the recording electrode 11 and the conductive layer 14 of the image holding member 12, which is composed of the recording layer 13 on the front side and the conductive layer 14 on the back side, and only the portion to which the voltage is applied is applied. An image is formed by attaching conductive colored magnetic fine powder to the image holding member 12.

A cleaning member may be provided to remove the displayed image on the image holding member, and blade cleaning, fur cleaning, suction cleaning, magnetic brush cleaning, brush cleaning, etc. used for removing fine powder may be provided. . As a cleaning method, it is more effective to electrically remove the charges induced on the image holding member through a cleaning member so as to remove the charges induced on the surface of the image holding member. Effective methods include arranging magnets adjacent to the surface and grounding them with conductive colored magnetic fine powder used for display interposed therebetween, or using a conductive brush.

In such a recording/displaying means, the following methods can be considered for increasing the contrast of the image holding member.

■A method of making the light reflecting surface uneven to cause diffused reflection.

■Method using aluminum anodic oxide film (Special Publication Publication No. 51
-Disclosed in Publication No. 46707).

(2) A method in which a diffuse reflection layer in which fine particles are dispersed in a binding resin is laminated on the conductive layer 7.

(2) A method of laminating on the conductive layer 7 a diffuse reflection layer in which fine particles are dispersed in a binding resin, and a dielectric layer.

However, method (2) is not preferable because the magnetic conductive developer is trapped in the recesses, resulting in a decrease in contrast.

In addition, in method (2), voltage leakage is likely to occur due to cracks occurring during anodization. Also, the surface becomes uneven.
This method causes the same disadvantages.

Furthermore, the whiteness of the anodic oxide film is low, making it difficult to obtain sufficient contrast.Furthermore, when the environment changes, voltage leaks occur frequently, and the recording or display density decreases, resulting in insufficient contrast. A point appears.

Method (2) has a high initial whiteness and excellent contrast, but the magnetic conductive developer is captured by the microscopic voids created by dispersing the fine particles during repeated use, resulting in a decrease in contrast.

Furthermore, when the temperature, humidity, etc. fluctuate, the adsorption and desorption of moisture in the remaining microscopic voids is significant, causing a large change in electrical resistance. Therefore, the electrical adsorption force of the developer changes depending on the environment, leading to problems such as large fluctuations in image contrast. That is, under high humidity conditions, adsorption of humidity progresses significantly through minute gaps, resulting in a large decrease in electrical resistance and a decrease in the adsorption force of the magnetic conductive developer (resulting in a decrease in contrast).

Method (2) has a high initial whiteness and excellent environmental stability, but the whiteness still tends to decrease slightly after repeated use.

The present invention has been made in order to solve the problems of the prior art described above, and its purpose is to record a display by electrically attracting conductive colored magnetic fine powder onto a dielectric material using a pin electrode or the like. An object of the present invention is to provide a display device that exhibits high contrast, excellent recording or display characteristics, and has low environmental dependence (and is highly durable and stable).

[Means and effects for solving the problems] The present invention has the following features:
An image holding member and a plurality of divided electrodes are arranged so as to be separated and face each other via conductive colored magnetic fine powder, and a voltage is applied between the image holding member and the electrodes to electrically conduct the image holding member. In a recording/display device in which conductive colored magnetic microparticles are attached to a surface, the holding member has at least a dielectric layer laminated on the surface of a diffuse reflection layer in which reflective fine particles are dispersed in a resin mainly composed of polyamide. The recording and display device is characterized in that the electrical resistance of the diffuse reflection layer is set to a smaller value than the electrical resistance of the dielectric layer.

That is, the following effects can be obtained by dispersing reflective fine particles in polyamide.

Since the reflective fine particles are highly dispersed, the unevenness on the surface of the diffuse reflection layer is reduced. As a result, the conductive magnetic fine powder does not enter the recesses during repeated use, and there is little decrease in contrast due to durability. Therefore, it is possible to extend the durability life. Furthermore, since the distribution and magnetism of the reflective fine particles and polyamide are improved, electrical uniformity is improved and image quality without blur can be obtained. Furthermore, the light reflection of the reflective fine particles becomes uniform, which is effective in improving whiteness.

Furthermore, due to the chemical properties of polyamide, a flexible three-dimensional structure is formed by hydrogen bonds between polymer molecules, so that there are very few cracks, voids, etc. generated inside the diffuse reflection layer. If micro-gaps such as cracks and voids exist in the diffuse reflection layer, when the environment changes, the electrical resistance will fluctuate significantly due to significant adsorption and desorption of water through the micro-gaps, and the electrical resistance of the conductive colored magnetic fine powder will change. The adsorption force will change depending on the environment.

That is, under high humidity conditions, adsorption of humidity progresses significantly through the microgaps, resulting in a large decrease in electrical resistance, a decrease in the adsorption force of the conductive magnetic fine powder, and a decrease in contrast.

Therefore, when the microvoids are reduced as recognized in the present invention, there is little change in electrical resistance when the environment changes, and there is little change in the adsorption force of the conductive colored magnetic fine powder (image quality such as density becomes stable). Furthermore, the penetration of the conductive colored magnetic fine powder into minute gaps is reduced, resulting in less decrease in contrast when repeatedly displayed, leading to improved durability.

In addition, the electrical properties of polyamide, i.e., the volume resistivity of polymers for boat fishing is more than 1 ol S Ω cm, but because polyamide has a low volume resistivity of 1 O 12''' 14 Ω cm, the applied voltage used for recording was Since the voltage is removed efficiently and uniformly, the previous layer is easily erased (memory is reduced and image quality is improved).

In addition to the above-mentioned effects of the present invention obtained by the diffuse reflection layer in which reflective fine particles are dispersed in polyamide, an even more noteworthy effect is that the penetration of moisture is greatly reduced due to the reduction of minute gaps such as cracks and voids in the diffuse reflection layer. Aluminum, iron, tin, etc. due to moisture penetration after a long period of time.
It does not cause image quality deterioration such as a decrease in density or fog due to an increase in electrical resistance due to corrosion of a corrosive conductive layer such as zinc (it has excellent long-term characteristic stability).

Furthermore, by providing a resin dielectric layer mainly made of resin on the diffuse reflection layer, reflective fine particles are dispersed in the resin, so that the reflective fine particles that remain on the surface of the diffuse reflection layer, which cannot be completely removed, can be removed. By providing a resin dielectric layer, minute irregularities and minute voids that occur inside can be further removed.As a result, conductive magnetic fine powder will not infiltrate into minute voids during repeated use, and will not adhere due to minute irregularities on the surface. Since it is possible to prevent a decrease in contrast during repeated use and a decrease in electrical resistance due to adsorption of moisture through minute voids during high humidity, it is possible to further prevent a decrease in contrast during high humidity.

In other words, the more excellent effects obtained by providing a dielectric layer on the diffuse reflection layer are as follows. ■ Basically, the presence of a dielectric layer has a barrier function against moisture intrusion into minute voids, or the dielectric layer formed by coating This is achieved by further removal of internal cracks and microvoids due to the filling effect of the dielectric layer, which is caused by the surface tension during the formation of the dielectric layer that penetrates into the internal cracks or microvoids in the diffuse reflection layer.

In a structure in which a dielectric layer is laminated on such a diffuse reflection layer, the dielectric layer of the image holding member and the magnetic conductive developer are in direct contact with each other, and as a result, charge is injected from the magnetic conductive developer when a voltage is applied, and the dielectric layer generates an electric charge. At this time, if the electrical resistance of the diffuse reflection layer constituting the image holding member is greater than the electrical resistance of the dielectric layer, the charge decay in the diffuse reflection layer will be slower than the charge decay in the dielectric layer. Charges remain at the interface with the diffuse reflection layer, resulting in extremely poor charge removal efficiency (and potential remaining inside causes ghosting and reduced contrast during repetition).

In the present invention, since the electrical resistance of the diffuse reflective layer is smaller than the electrical resistance of the dielectric layer, the charge on the diffuse reflective layer is quickly attenuated. As a result, the charge remaining inside the dielectric layer can be quickly discharged to the substrate side through the diffuse reflection layer, which is extremely advantageous in attenuating the residual charge.
It is effective in removing ghosts and preventing a decrease in contrast during repetition.

The voltage applied during recording is distributed according to the electrical resistance of the diffuse reflection layer and the dielectric layer.

■(Applied voltage) = iXrl (Electrical resistance of diffuse reflection layer)
+1Xr2 (electrical resistance of the dielectric layer) V+ (voltage of the diffuse reflective layer) +V2 (voltage of the dielectric layer) (i: current flowing through the image holding member) Therefore, the electrical resistance of the diffuse reflective layer is smaller than the electrical resistance of the dielectric layer ( Therefore, the applied voltage will be applied to the dielectric layer more than the diffuse reflection layer.In particular, if the electrical resistance of the dielectric layer is one order of magnitude or more higher than that of the diffuse reflection layer, the applied voltage will be 90%.
% or more of the dielectric layer, the thickness of the diffuse reflection layer can be increased, and the whiteness can be significantly improved, making it possible to achieve extremely high contrast. It has also been experimentally confirmed that this effect is especially remarkable when the intrinsic volume resistivity of the diffuse reflection layer is 1012 Ω・cm or less, and it is also useful for removing ghosts and preventing contrast deterioration during repeated use. , also had a great effect.

The display function due to adsorption of the magnetic conductive developer in the present invention is due to charges induced in the diffuse reflection layer 6a and the dielectric layer 6b by an electric field. The condition is that the layer does not easily become conductive, or that it generates a substantial potential when charged and functions to produce sufficient contrast.

Therefore, the state in which the image holding member 5 should function depends on the conditions of use (there are some requirements, but if high contrast is aimed at as in the present invention, the state in which it should function is 100 m after being charged).
Since it is necessary to maintain 50% or more of the initial charging voltage at sec or more, it is preferable to set the specific electrical resistance between the dielectric layers 6b of the diffuse reflection layer 6a to 10<12>Ω·cm or more. When aiming for higher contrast, the specific electrical resistance between the diffuse reflection layer 6a and the dielectric layer 6b is 1013Ω・c.
m or more is desirable. The electrical resistance of this diffuse reflection layer 6a is
It is set to a value smaller than the electrical resistance of the dielectric layer 6b.

In the recording/display device of the present invention, the display characteristics are based on the characteristics of the electrical resistance of the diffuse reflection layer and the dielectric layer, and since the charge is mainly generated facing the dielectric layer, it is proportional to the amount of charge generated in the dielectric layer 6b, so the magnetic Although it is somewhat related to the degree of coloring of the conductive developer, in principle, if the voltage applied when forming the t1 display is the film thickness between the dielectric layers 6b, then in order to obtain sufficient contrast, It is desirable that the relationship v>ls (V/μm)Xt (μm) be satisfied. In order to obtain even higher contrast, it is desirable that V>20 (V/μm)Xt (μm). Considering the matching with the drive circuit, the voltage 1
Since it is relatively easy to output a voltage of about 00 V or less, the practical thickness of the dielectric layer 6b is 7 μm or less, preferably 5 μm or less.

Examples of the resin forming the dielectric layer 6b include polyester, acrylic resin, and polyolefin.

Polyacetal, polyamide, polystyrene, halogen-containing resin, silicone resin, polyether, polycarbonate, vinyl acetate resin, cellulose resin.

and thermoplastic resins represented by these copolymers, felt resins, xylene resins9 petroleum resins, urea resins, melanin resins, unsaturated polyesters, alkyd resins, epoxy resins, silicone resins, furan resins, etc. alone or in combination. There are thermosetting resins represented by polymers, and these can also be used as a mixture.

It is also possible to lower the electrical resistance by adding an ion conductive substance, an ion conductive polymer, an electronic conductive substance, an electronic conductive polymer, etc. to these resins.

The diffusive reflective layer may be made of organic resin powder such as styrene resin powder, silicone resin powder, halogenated olefin resin powder (e.g. polyethylene powder, polytetrafluoroethylene powder), acrylic resin powder, phenolic resin powder, melamine resin powder, etc. Or titanium oxide, magnesium oxide.

Calcium oxide, barium oxide, zinc oxide, tin oxide,
Reflective fine particles such as metal oxides such as antimony oxide and indium oxide, metal sulfates such as barium sulfate, magnesium sulfate, and calcium sulfate, and metal carbonates such as barium carbonate, magnesium carbonate, and calcium carbonate, such as 6-nylon, 6-nylon, etc. Low nylon, 610-nylon, 8-nylon, 11-nylon, 12-nylon, and copolymer nylons thereof (6/66/610/12 quaternary copolymer nylon, 6/66 binary copolymer nylon, etc.) or Polyamide such as N-alkoxymethyl modified nylon is dispersed in a single resin or a mixed resin.

In order to reduce the electrical resistance of the diffusive reflective layer, for example, an ion conductive substance, an ion conductive layer polymer,
It is desirable to add an electronically conductive substance, an electronically conductive polymer, or the like. In particular, the diffusive reflective layer has excellent reflectivity and excellent dispersibility, and there is less variation in electrical resistance due to the environment. Also, by using mainly conductive fine particles to significantly reduce electrical resistance, it is extremely effective. You can get . Examples of the conductive fine particles include conductive metal powder, conductive carbon, and metal oxides.

However, it is difficult to use conductive metal powder when it is made into powder because it oxidizes and forms an oxide film on the surface, resulting in loss of conductivity and poor reflectivity (whiteness does not reach the required 60% or higher). Alternatively, conductive carbon cannot be used because its whiteness is 0 and contrast cannot be obtained.

In the present invention, tin oxide, zinc oxide, antimony oxide, indium oxide, etc. are excellent in providing a predetermined conductivity in terms of contrast as a recording or display device.

For example, fine particles of tin oxide, tin oxide and other titanium oxides, magnesium oxide, silicon oxide, aluminum oxide,
Metal oxides such as barium oxide, metal sulfates such as barium sulfate, magnesium sulfate, calcium sulfate, or barium carbonate.

Fine particles made of metal carbonate such as magnesium carbonate and calcium carbonate are desirable.

For example, fine particles of zinc oxide, zinc oxide and other titanium oxides, magnesium oxide, silicon oxide, aluminum oxide,
Fine particles made of metal oxides such as barium oxide, metal sulfates such as barium sulfate, magnesium sulfate, and calcium sulfate, or metal carbonates such as barium carbonate, magnesium carbonate, and calcium carbonate are preferable.

For example, fine particles of antimony oxide, antimony oxide and other metal oxides such as titanium oxide, magnesium oxide, silicon oxide, aluminum oxide, barium oxide, or barium sulfate, magnesium sulfate.

Metal sulfates such as calcium sulfate or barium carbonate,
Fine particles composed of carbonate metal salts such as magnesium carbonate and calcium carbonate are desirable. For example, fine particles of indium oxide, indium oxide and other titanium oxides, magnesium oxide.

Fine particles made of metal oxides such as silicon oxide, aluminum oxide, barium oxide, metal sulfates such as barium sulfate, magnesium sulfate, calcium sulfate, or metal carbonates such as barium carbonate, magnesium carbonate, calcium carbonate, etc. are desirable. .

In addition to these conductive fine particles, reflective fine particles can be prepared by, for example, forming a film by mixing incompatible polymers, or dispersing insoluble fine particles in a binding resin. Insoluble fine particles include metal oxides such as titanium oxide, aluminum oxide, magnesium oxide, calcium oxide, and barium oxide, metal sulfates such as barium sulfate, magnesium sulfate, and calcium sulfate, barium carbonate, magnesium carbonate, calcium carbonate, etc. The use of a mixture of carbonate metal salt, fine powder of thermoplastic resin, or hardened fine powder of curable resin had an excellent effect in increasing the contrast.

Note that the fine particles are not limited to these.

Composition ratio P/ of reflective fine particles (P) and polyamide (B)
When the B ratio is P/B > 4, it is basically impossible to suppress the generation of minute gaps (and when P/B < 0.5, the whiteness decreases and the display characteristics become insufficient. Therefore, when the B ratio is 4. ≧P/
B≧0.5 is an appropriate range for the composition ratio.

Until now, such recording or display methods have had insufficient whiteness and have not been able to obtain the necessary contrast; however, in the present invention, the diffuse reflection layer is composed of a binding resin and reflective fine particles dispersed therein; In addition, there is no loss of applied voltage due to the diffuse reflection layer, and since the film thickness can be increased, excellent whiteness can be obtained, and sufficient contrast can be obtained with little viewing angle dependence.

Recording and display devices are required to have little dependence of contrast on viewing angle, that is, to have excellent diffuse reflection properties.

There are several methods for defining diffuse reflectance, but in the present invention, from the viewpoint of simplicity and practicality, it is defined as whiteness based on the reflection density obtained with a Macbeth densitometer or a similar functional product, based on the following.

Whiteness = ((1,44-reflection density) / (1,44+
0.04)) X100 whiteness 100: reflection density≦0.
04 (Almost everyone described it as pure white in the panel test) Whiteness O: Reflection density ≧ 1.44 (Almost everyone described it as black in the panel test. Also, there is no contrast at all.) This definition of whiteness Based on this, the contrast of recording or display can be defined as the difference between the whiteness of the image holding member and the whiteness of the recording or display section. Therefore, a decrease in the whiteness of the image holding member inevitably results in a decrease in contrast, resulting in insufficient recording or display.

Further, research has revealed that the effects of the present invention are not impaired even if an intermediate layer is provided between the conductive layer and the diffuse reflection layer to increase adhesion in order to prevent separation between the conductive layer and the diffuse reflection layer.

Further, the conductive layer in the present invention is a layer having sufficiently low electrical resistance and easily being in a conductive state, in other words, a layer that functions so as not to generate a substantial potential when charged. Therefore, the state in which the conductive layer should function depends on some factors depending on the conditions of use, but when aiming for high contrast as in the present invention, the floating potential generated in the conductive layer causes a decrease in contrast. In other words, 1/1 of the initial charging potential at 100 msec or less after charging
If it is attenuated to 0 or less, it can be said that there is a sufficient conduction state, so the specific electrical resistance of the conductive layer is 1012 Ω·cm. If you are aiming for faster image display, 1 msec after charging.
The specific electrical resistance of the conductive layer is 1oll.
It is desirable that it be less than 1Ω·cm.

The materials that form the conductive layer are aluminum and iron.

Conductive metals such as gold, tin, and zinc, carbon, and tin oxide.

The above conductive substance is powdered and dispersed in a single or composite conductive inorganic compound such as indium oxide or antimony oxide, or in a continuous phase such as a polymer, which particularly enhances the contrast in recording or display. For this reason, it is desirable that the conductive layer has low light absorption and excellent light reflection.

Next, although the conductive colored fine powder is not a condition that limits the present invention, it is mainly composed of a binder, conductive powder, magnetic material, and, if necessary, various dyes and pigments as colorants. It is.

As the binder, the above-mentioned binding resin is used, and is generally used in an amount of 15 to 60% by weight.

As the conductive powder, conductive carbon, fine powder of various conductive metals, fine powder of conductive oxides such as zinc oxide, tin oxide, indium oxide, and antimony oxide are used, and generally 2 to 30 %used.

In addition, as a magnetic material, 20 to 80% by weight of ferric oxide etc.
used.

Furthermore, dyes and pigments such as various phthalocyanines and malachite green are used as coloring agents as needed.
It is used in a range of 20% by weight.

Heat each component listed above to about 100 to 300°C, mix uniformly, cool, and grind into fine powder, or remove powder with unnecessary particle size by classification, etc., if necessary. By doing so, the desired conductive colored magnetic fine powder can be obtained.

It generally has an average particle size of about 5 to 20 μm, and has a specific electrical resistance in the range of 10''Ω・cm to 10′Ω・cm at an applied voltage of 100V or less in a conductive colored fine powder storage container. Ru.

On the other hand, to introduce the general process conditions for the recording/display device of the present invention, first, the rotating magnetic poles are composed of 6 to 50 poles and have a rotation speed of 3 to 500 Gauss.
It is used by rotating at about 00 to 7.00 rpm. As the non-magnetic cylinder, a single or composite molded product of non-magnetic metal such as aluminum or stainless steel, or plastic or various inorganic oxides is used, and this may be used in a rotating or non-rotating state. As a recording electrode, the electrode width was 0 and 1-1 mm.

An applied voltage of 10 to 100 V is used with an electrode spacing of 0.1 to 1 mm. The moving speed of the recording medium is 50 to 700 m
/sec, the distance to the electrode is 50 to 500 μm
It is set to a certain degree.

The structure of a model of an image holding member according to the present invention is illustrated in FIGS. 1 and 2.

That is, FIG. 1 shows a conductive support 1 with a diffuse reflection layer 2 on one side.
FIG. 2 shows a structure in which a diffuse reflection layer 6 and a dielectric layer 7 are laminated on one side of a support 4 with a conductive layer 5 interposed therebetween.

Example 1 A recording/displaying device shown in FIG. 4 was manufactured.

Reference numeral 26 denotes an image holding member formed in the shape of an endless belt, which is composed of a conductive support, a diffuse reflection layer, and a resin dielectric layer as shown in FIG. Note that the image holding member 26 may be in the form of a belt that is not endless. The image holding member 26 is wound around a pair of rollers 17° 23 arranged vertically opposite to each other.
In the display section 25, it is movably supported on a plane by the back plate 22 and rollers 17.23, and is driven in the direction of the arrow during image formation.

At the lowest position of the circulation path of the image holding member 26, that is, at the position facing the roller 17, conductive colored magnetic fine powder 8 as a display substance is attached to the image holding member 26 according to display information to form a display. Means 27 for doing this is provided. Note that the conductive colored magnetic fine powder 8 is housed in a container 15.

The information obtained from the document reading device 21 based on the display forming means 27 is sent to the recording control section 19 via the storage device 20.
is applied to the recording electrode 11 as an electrical signal. Note that 24 is a transparent plate, 18 is a cleaning member, and 25 is a display section.

After heating 100 parts by weight of methoxymethyl-modified 6-nylon with a methoxymethylation rate of 20% and 200 parts by weight of tin oxide fine particles with an average particle size of 0.3 μm to 200°C and uniformly dispersing the titanium oxide-dispersed nylon resin, 23 from the mold die
It was extruded into a film at 0° C. and thermally laminated on one side of a 50 μm thick aluminum foil to provide a diffuse reflection layer with a thickness of 10 μm.

Next, thermosetting phenolic resin (number average molecular weight 500)
A paint with a viscosity of 10 cps consisting of 10 wt% and 90 wt% of methyl ethyl ketone was applied using a reverse roll coater at a coating speed of 4 m/min and a gap of 10 μm.
After drying at 40° for 5 minutes, a resin dielectric layer with a thickness of 1 μm was placed on the diffuse reflection layer of the white film to produce an image holding member.

The image holding member manufactured in this manner was installed in the apparatus shown in FIG. 4, and its display function was examined.

Example-1 was prepared using the same procedure as Example-1 as Example-2.
Titanium oxide fine particles with an average particle size of 0.3 μm were used in place of the tin oxide used in .

Example-1 was prepared using the same procedure as Example-1 as Comparative Example-1.
Instead of the methoxymethyl-modified 6-nylon used in , an acrylic resin with a number average molecular weight of 2XIO' (a copolymer consisting of 50 parts by weight of methyl methacrylate, 45 parts by weight of butyl methacrylate, and 5 parts by weight of acrylic acid) was used.
was used.

Example-2 was prepared using the same procedure as Example-1 as Comparative Example-2.
The titanium oxide fine particles used in Example 1 and the acrylic resin used in Comparative Example-1 were used.

Table 1 shows the prescription of the diffuse reflection layer and the specific volume resistivity.
Further, Table 2 shows the characteristics as an image holding member.

The conductive colored magnetic fine powder used was composed of 30 parts by weight of bisphenol A epoxy resin, 10 parts by weight of conductive carbon, and 60 parts by weight of iron oxide, and had an average particle size of 10 parts by weight.
μm, and a specific electrical resistance of 10′Ω·cm (ioov applied).

In addition, the rotating magnetic pole is 16 poles, 900 Gauss, outer diameter 36φ
The rotation speed was 2.20 rpm in the opposite direction to the moving direction of the image holding member. The non-magnetic cylinder has a wall thickness of 1 mm.
.

It has an outer diameter of 40φ, and a 200 μm thick polyimide film with electrodes formed by etching at a position facing the image holding member with an electrode width of 0.5 mm and an electrode spacing of 0.25 mm is placed on the outer surface of a non-magnetic cylinder. Glued.

The voltage applied to the electrodes was 40V.

Under these conditions, the image holding member was transported at a speed of 220 mm/sec, and the display function was examined. The results are shown in Table 2.

In addition, Table 1 shows the formulation of the diffuse reflection layer of Examples and Comparative Examples.
and specific volume resistivity.

In addition to these, the following image quality features were obtained. For example, when displaying is repeated frequently, a so-called ghost, in which the content of the previous display screen slightly remains, occurs in Comparative Examples 1 and 2, but this ghost is not observed in Examples 1 and 2, and good display is achieved. could be done repeatedly.

In addition, after one month had passed, Comparative Example-1゜2
The surface was extremely uneven with a surface roughness of 10 μm. When the coating was peeled off and the board was observed, the aluminum on the board was corroded. On the other hand, in Examples 1 and 2, there was no change in surface roughness and the aluminum of the substrate was not corroded.

When the images were displayed, it was found that in Comparative Examples 1 and 2, the uniformity of density was significantly lacking, leading to a significant decrease in contrast even during durability, and the characteristics were clearly worse than immediately after production.

On the other hand, in Examples 1 and 2, the same image quality as immediately after manufacture was obtained, and no deterioration of characteristics occurred over time.

Example-3 Methoxymethyl modified 6 with methoxymethylation rate of 20 wt%
- When 100 parts by weight of nylon was dissolved in 500 parts by weight of methanol and 200 parts by weight of toluene, the average particle size was 0.3.
Add 200 parts by weight of micron tin oxide particles and disperse with a bead mill disperser to obtain a viscosity of 100 cps.

A paint having an average particle size of 0.3 μm was prepared. This paint was applied using a reverse roll coater at a coating speed of 4 m for 7 minutes and a roll gap of 30 μm onto a polyester film with a thickness of 100 μm on which aluminum had been deposited to a thickness of 600 μm, and dried at 140°C. , a diffuse reflection layer with a film thickness of 10 μm was provided.

Next, butyral resin (number average molecule fi40Xlo3)
A coating material with a viscosity of 35 cps consisting of 5 parts by weight, 60 parts by weight of methyl ethyl ketone, and 35 parts by weight of cyclohexane was applied using a reverse roll coater at a coating speed of 4 m for 7 minutes.

It was coated with a gap of 20 μm, dried at 140' for 5 minutes, and a resin dielectric layer with a thickness of 1 μm was placed on the diffuse reflection layer of the white film to produce an image holding member.

The image holding member manufactured in this manner was mounted in the apparatus shown in FIG. 4 in the same manner as in Example-1, and the display function was examined.

In addition, an example using nylon camphor, which is different from the methoxymethyl-modified 6-nylon used in Example-3, and a comparative example using other resins were added using the same manufacturing method as Example-3. For Comparative Example 3, n-butanone was used due to the solubility of the resin used.

In addition to these, the following image quality features were obtained. For example, when displaying is repeated frequently, a so-called ghost, in which the content of the previous display screen slightly remains, occurs in Comparative Example 3, but in Examples 3, 4, and 5, this ghost is not observed and good display is achieved. could be done repeatedly.

Moreover, after one month had passed, the surface of Comparative Example 3 was extremely uneven with a surface roughness of 10 μm.

When the coating was peeled off and the board was observed, the aluminum on the board was corroded. On the other hand, in Examples 3 and 4.5, there was no change in surface roughness and the aluminum of the substrate was not corroded.

When the image was displayed, it was found that in Comparative Example 3, the uniformity of density was significantly lacking and the contrast was significantly lowered even during durability, and the characteristics were clearly worse than immediately after production.

On the other hand, in Examples 3, 4, and 5, the same image quality as immediately after manufacture was obtained, and no deterioration of characteristics occurred over time.

Example-6 Methoxymethyl modification 6 with methoxymethylation rate of 20 wt%
- When 100 parts by weight of nylon was dissolved in 500 parts by weight of methanol and 200 parts by weight of toluene, the average particle size was 0.3.
200 parts by weight of conductive titanium oxide fine particles on which tin oxide and antimony oxide had been deposited were added to titanium oxide having a diameter of 100 μm and dispersed in a bead mill disperser to prepare a paint having a viscosity of 100 cps and an average particle size of 0.3 μm.

Apply this paint using a reverse roll coater at a coating speed of 4.
Coated on a polyester film with a thickness of 100 μm on which aluminum was vapor-deposited to a thickness of 600 mm under the condition of a roll gap of 15 μm for 7 minutes, and dried at 140 ° C.
A diffuse reflection layer with a film thickness of 10 μm was provided.

Next, butyral resin (number average molecule fi40Xlo')
A coating material with a viscosity of 35 cps consisting of 5 parts by weight, 60 parts by weight of methyl ethyl ketone, and 35 parts by weight of cyclohexanone was applied using a reverse roll coater at a coating speed of 4 m/min.

It was coated with a gap of 20 μm, dried at 140' for 5 minutes, and a resin dielectric layer with a thickness of 1 μm was placed on the diffuse reflection layer of the white film to produce an image holding member.

The image holding member manufactured in this manner was mounted in the apparatus shown in FIG. 4 in the same manner as in Example-1, and the display function was examined.

In addition, an example using antimony oxide and reduced conductive zinc oxide, which are different from the conductive titanium oxide used in Example-6, was added using the same manufacturing method as Example-6.

In addition to these, the following image quality features were obtained. For example, when displaying is repeated frequently, so-called ghosts, in which screen contents remain slightly, are not observed in Examples 6 and 7°8, and good display can be repeatedly performed.

In addition, after one month has passed, Example-6゜7
．． In No. 8, there was no change in surface roughness and the aluminum of the substrate was not corroded. When the image was displayed, Example-
In samples No. 6, No. 7, and No. 8, the same image quality as immediately after manufacture was obtained, and there was no deterioration in characteristics over time.

Example-9 Using the same recipe as the diffuse-reflecting layer and dielectric layer used in Example-6, the gap distance of the reverse roll coater was adjusted to create diffuse-reflecting layers and dielectric layers with different film thicknesses. Added as an example. See Table 8 for the film thicknesses of the diffuse reflection layer and dielectric layer in each example.

In addition to these, the following image quality features were obtained. For example, if the display is repeated frequently, so-called ghosts, in which a small amount of the screen contents remain, may occur in Examples-9, 10゜11, 12.
13. No. 14 was observed, and good display could be repeatedly performed.

In addition, after one month has passed, Example-9゜t
o, 11. 12. 13. In No. 14, there was no change in surface roughness and the aluminum of the substrate was not corroded. When the images were displayed, Example-9, 10, 11, 1
In 2°13 and 14, the same image quality as immediately after manufacture was obtained, and there was no deterioration in characteristics over time.

As is clear from the above embodiments, the present invention provides excellent contrast, recording or display characteristics, and repeatability.
Environmental stability can be obtained.

The present invention is not limited to the embodiments described above, and can be implemented with various modifications without departing from the gist. For example, the recording and displaying device shown in FIG. 1 is provided with a writing display function, a reading function, and a printing function, and FIG. 5 shows another embodiment of the recording and displaying device according to the present invention.

Image information to be displayed is input from the document reading device 30 and sent as an electrical signal to the recording electrode 11 by the recording controller 28 from the encoding/decoding circuit 31 via the encoding/decoding circuit 31 and the storage device 29 or directly. applied.

Further, on the outer peripheral side of the image holding member 45, a writing medium 44 formed in the shape of an endless belt, transparent, and capable of being written on and erased with a felt pen or the like is disposed, and this writing medium 44 is provided with rollers 48, 50, . 40 so that it can circulate and move, and is supported in a flat manner by rollers 40.degree. 48 in the display section. Further, in the vicinity of the roller 17, a cleaning member 5 is provided for removing the conductive colored magnetic fine particles adhering to the image on the image holding member 45 and the back surface of the writing medium 44.
1.52 is provided. This cleaning member removes conductive colored magnetic fine powder by moving toner spikes formed on the outer periphery of a cylindrical member by magnetic attraction in a rotating brush shape. Furthermore, an erasing member 49 for erasing an image written on the writing medium 44 is disposed below the roller 19. Furthermore, the image holding member 4
An image holding member 45 and a means 38 for reading the image on the writing medium 44 are arranged on the back side of the writing medium 5 . That is, at the reading position that is the closest position between the recording medium 5 and the writing medium 44, there is a reflective shade 3 that illuminates the images on both members 45 and 44.
7 and a mirror 36 that causes reflected light images from both members 45 and 44 to enter the photoelectric conversion element 33 via the lens 34. Both members 45 and 4
The image No. 4 is read by the photoelectric conversion element 33 and recorded on the printer 32 directly via the encoding/decoding circuit 31 or via the storage device 14.

〔Effect of the invention〕

According to the present invention, it is possible to provide a recording/display device exhibiting high contrast and excellent recording or display characteristics.

[Brief explanation of drawings]

FIGS. 1 and 2 are layer configuration diagrams of one embodiment of the image holding member for recording and display of the present invention, respectively. FIG. 3 is an explanatory diagram of the principle of recording using conductive colored magnetic fine powder. FIG. 4 and FIG. 5 are explanatory diagrams of one aspect of the recording/displaying apparatus according to the present invention, respectively. l... Conductive support 2... Diffuse reflection layer 3...
Resin dielectric layer 4... Support 5... Conductive layer
6... Diffuse reflection layer 7... Resin dielectric layer 8
...Conductive colored magnetic fine powder 11...Recording electrode
15... Container 16... Device framework 17 and 23... Roll 22... Back plate 24.
...Transparent plate 26...Image holding member diagram

Claims (4)

[Claims] (1) An image holding member and a plurality of divided electrodes are arranged so as to face each other in isolation via conductive colored magnetic fine powder, and a voltage is applied between the image holding member and the electrodes to form the image holding member. In a recording and display device in which electrically conductive colored magnetic fine powder is attached to a surface, the image holding member has a dielectric layer laminated on the surface of at least a diffuse reflection layer made of a resin mainly composed of polyamide with reflective fine particles dispersed therein. A recording/display device characterized in that the electrical resistance of the diffuse reflection layer is set to a smaller value than the electrical resistance of the dielectric layer. (2) The recording and display device according to claim 1, wherein the dielectric layer has an intrinsic volume resistivity that is one order of magnitude or more larger than the intrinsic volume resistivity of the diffuse reflection layer. (3) The specific volume resistivity of the dielectric layer is 10^1^2Ω・cm
Above, the specific volume resistivity of the diffuse reflection layer is 10^1^2Ω・
2. The recording/displaying device according to claim 1, wherein the recording/displaying device is less than cm. (4) The reflective fine particles are made of at least one or more of tin oxide or an oxide of tin, zinc oxide or an oxide of zinc, antimony oxide or an oxide of antimony, indium oxide or an oxide of indium. A recording/displaying device according to claim 1.