JPH02277068A - Recording display device - Google Patents

Abstract

PURPOSE:To obtain the recording display device which exhibits excellent display characteristics and high stability by providing a diffusion reflecting layer formed by dispersing reflecting fine particles into a resin essentially composed of at least polyamide as an image holding member. 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 improved in the dispersion of the reflecting fine particles by dispersing the reflective fine particles into the polyamide and, therefore, the ruggedness existing on the surface of the reflecting layer is decreased. 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. The whiteness is thus improved. In addition, the volume resistivity of the polyamide is as low as 10<12-14>OMEGA.cm and, therefore, the removal of the impressed voltage used for the recording is uniformly executed with good efficiency. 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 5 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, some 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 (patent application 5
6-197410), 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 to it (Utility Model Application No. 57-55061), or A device that electrically adsorbs and displays conductive colored magnetic fine powder on a dielectric material using pin electrodes (Japanese Patent Publication No. 51-46
No. 707), a device that displays conductive colored magnetic fine powder using magnetic attraction force using an easily magnetized 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 on the non-magnetic cylinder 10, so that it is densely arranged on the non-magnetic cylinder lO along the axial direction. 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 and reflecting it diffusely.

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

■A method of laminating a diffuse reflection layer made of binder resin with fine particles dispersed on top of the conductive layer.

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

In addition, method (■) tends to cause voltage leaks because cracks occur during anodic oxidation, the surface becomes uneven, which causes the same problems as method (■), and the whiteness of the anodic oxide film is low and the contrast is insufficient. Problems have arisen, such as the inability to maintain high resolution, and frequent voltage leaks when the environment changes, resulting in a decrease in recording or display density and insufficient contrast.

In addition, method (2) has a high initial whiteness and excellent contrast, but the small voids created by dispersing the particles trap the conductive colored magnetic fine powder during repeated use, leading to a decrease in contrast. , when humidity etc. fluctuate, moisture is adsorbed and desorbed in the remaining minute voids, resulting in problems such as large contrast fluctuations.

[Problem that the invention seeks to solve]

An object of the present invention is to provide a recording/display device that displays by electrically adsorbing conductive colored magnetic fine powder onto a dielectric material using a bottle electrode or the like, which exhibits high contrast and excellent recording or display characteristics, and which exhibits environmental dependence. The purpose of the present invention is to provide a recording/displaying device that is small in size and has excellent durability.

Another object of the present invention is to provide an image holding member capable of recording and displaying with high contrast.

[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 facing each other via conductive colored magnetic fine powder, and a voltage is applied between the image holding member and the electrodes, and the holding member is made mainly of at least polyamide. This recording/display device is characterized by having a diffuse reflection layer in which reflective fine particles are dispersed in a resin.

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 of the reflective fine particles and polyamide improves the magnetism, electrical uniformity improves, and image quality without roughness can be obtained. Furthermore, the light reflection of the reflective fine particles becomes uniform, which is effective in improving whiteness.

Due to the chemical properties of polyamide, a flexible three-dimensional structure is formed by hydrogen bonds between polymer molecules, so 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 an increase in electrical resistance (decrease), a decrease in the adsorption force of the conductive magnetic fine powder, and a decrease in contrast.

Therefore, as recognized in the present invention, when the microgaps are reduced, there is little change in electrical resistance when the environment changes, and the adsorption force of the conductive colored magnetic fine powder is less fluctuated, resulting in stable image quality such as density. 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 1016 Ω・cm, but the volume resistivity of polyamide is 1□l! ~1
Due to its low volume resistivity of 4 Ω·cm, the applied voltage used for recording is removed efficiently and uniformly, so the previous layer is easily erased (memory is reduced, resulting in improved image quality).

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 penetrating moisture over a long period of time.
It has excellent long-term characteristic stability without causing image quality deterioration such as a decrease in density or fogging due to an increase in electrical resistance due to corrosion of a corrosive conductive layer such as zinc.

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 microscopic 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 The above functions can achieve 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 internal cracks or microvoids in the diffuse reflection layer. It is.

In the present invention, the recording/display function by adsorption of the conductive colored magnetic fine powder is based on the charge induced in the diffuse reflection layer and the resin dielectric layer induced by an electric field. A layer that has electrical resistance and does not easily become conductive, or a layer that generates a substantial potential when charged and functions to provide sufficient contrast. Therefore, the state in which it should function as an image holding member depends on the usage conditions (there are some factors), but when aiming at high contrast as in the present invention,
Since it is necessary to maintain 50% or more of the initial charging voltage at 00 msec or more, a lamination of a diffuse reflection layer and a dielectric layer (
When an intermediate layer such as an adhesive layer is interposed between both layers, the specific electrical resistance of the laminated layer including the intermediate layer is 1O12 Ω·cm or more. When aiming for higher contrast, the specific electrical resistance of the laminated layer is preferably 1013 Ω·cm or more.

In the recording/display device of the present invention, the display characteristics are proportional to the amount of charge generated between the diffuse reflection layer and the dielectric layer, so it is somewhat related to the degree of coloring of the conductive colored magnetic fine powder that forms the display, but in principle If the film thickness of the diffuse reflection layer or dielectric layer stack is t, and the voltage applied when forming the display is E, then in order to obtain sufficient contrast, E>15 (V/μm)Xt (μm). Become.

To obtain even higher contrast, E>20 (
V/μm)Xt (μm) is desirable.

Considering matching with the drive circuit, it is relatively easy to output at a voltage of about 100 V or less, so the practical thickness of the film during charging is 7 μm or less, preferably 5 μm or less.

When a polyamide resin is used to form the diffuse reflection layer, the electrical resistance decreases due to its structural characteristics, and the applied voltage is almost not dispersed in the diffuse reflection layer. As a result, it is considered that the appropriate conditions for film thickness are generally applied to the dielectric layer. In order to set the potential on the surface of the dielectric layer to be high and to set the image density to be high, it is preferable that the diffuse reflection layer has a lower resistance than the dielectric layer.

Examples of the resin forming the dielectric layer include polyester, acrylic resin, polyolefin, polyacetal, polyamide, polystyrene, halogen-containing resin, silicone resin, polyether, polycarbonate, vinyl acetate resin, cellulose resin, and copolymers thereof. Thermoplastic resins represented by combinations, phenolic resins, xylene resins, and oil resins.

Urea resin, melamine resin, unsaturated polyester.

Alkyd resin, epoxy resin, silicone resin.

There are thermosetting resins such as furan resins, which are represented by single substances or copolymers, and these can also be used as a mixture. The film thickness is 4 μm or less, preferably 2 μm or less.

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, 61O-nylon, 8-nylon, 11-nylon, lZ-nylon, and their copolymer nylons (6/66/610/12 4
Original copolymer nylon, 6/66 binary copolymer nylon, etc.)
Alternatively, polyamide such as N-alkoxymethyl-modified nylon is dispersed in a single resin or a mixed resin.

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, 4≧P/B≧
0.5 is an appropriate range as a composition ratio.

Until now, such recording or display methods have had insufficient whiteness and have not been able to obtain the necessary contrast, but in the present invention, the diffuse reflection layer is composed of a binding resin and reflective fine particles dispersed therein. % or more of whiteness was obtained, and it became possible to obtain sufficient contrast 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 0: 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 a 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 area. Therefore, a decrease in the whiteness of the image holding member inevitably results in a decrease in contrast. As a result, it becomes insufficient as a record 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, it can be said that the conductive layer is in a sufficiently conductive state if it is attenuated to 1/1O or less of the initial charging potential within 100 m5 ec after charging, so that the specific electrical resistance of the conductive layer is 10 12 Ω·Cm. If higher-speed image display is desired, it is required that the electrical potential attenuates to 1/10 or less of the initial charging potential within 1 m5 ec after charging, so the specific electrical resistance of the conductive layer is preferably 1 olOΩ·cm or less.

The materials forming 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.

Further, 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, antimony oxide, etc. are used, and generally 2 to 30% by weight. used.

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

Furthermore, the coloring agents used as necessary include various phthalocyanines; dyes and pigments including malachite green.
It is used in a range of 20% by weight.

Each component listed above is heated to about 100 to 300°C, mixed uniformly, cooled, and ground into fine powder, or if necessary, powder with unnecessary particle size is removed by classification, etc. Once removed, the desired electrically 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 of 10'Ω·cm to 10'Ω·cm at an applied voltage of 100 V 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 about 6 to 50 poles and have a rotation speed of about 500 to 2,000 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. The recording electrode has an electrode width of 0.1 to 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 70
The speed is set to 0 m/sec, and the distance to the electrode is set to about 50 to 500 μm.

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 structure in which a diffuse reflection layer 2 and a dielectric layer 3 are laminated on one side of a conductive support 1, and FIG. A structure in which layer 6 and dielectric layer 7 are stacked is shown.

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 methoxymethyl content of 20% and 200 parts by weight of anatase-type titanium oxide fine particles with an average particle size of 0.3 μm to 200°C and uniformly dispersing the titanium oxide-dispersed nylon resin, Extruded into a film at 230℃ from a T-shaped die to a thickness of 50μm.
A diffuse reflection layer with a thickness of 5 μm was provided on one side of the aluminum foil by heat lamination.

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.

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.
μ, specific electrical resistance 10'Ω·cm (100V applied).

In addition, the rotating magnetic poles are 16 poles, 900 Gauss, outer diameter 36
φ is rotated at a rotation speed of 2,200 rprn in the opposite direction to the moving direction of the image holding member. The non-magnetic cylinder has a wall thickness of 1mm.
.

A 200 μm thick polyimide film with an outer diameter of 40 φ and electrodes provided 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 was 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 1.

In addition, an example using a nylon resin different from the methoxymethylated modified 6-nylon used in Example-1 using the same manufacturing method as Example-1, and a comparative example using other resins were added. .

Resin used White reflective layer thickness 6/66/6
10/124 copolymerized nylon 5μm8 nylon
5μm 12 nylon
5μm polystyrene
5 μm polymethyl methacrylate 5 μm polyester 5 μm Example-2 Example-3 Example-4 Comparative example-1 Comparative example-2 Comparative example-3 In addition to these, the following features in terms of image quality were obtained. For example, when the display was repeated frequently, a so-called ghost, in which the contents of the previous display screen slightly remained, occurred in Comparative Examples-1 and 2゜3, but this ghost was observed in Examples-1, 2, and 3゜4. We were able to repeatedly display good results without any problems.

In addition, after one month had passed, Comparative Example-1゜2
．． Sample No. 3 had a significantly uneven surface 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゜2 and 3.4, there was no change in surface roughness (the aluminum of the substrate was not corroded either. When the images were displayed, it was found that Comparative Examples-1, 2
, 3, the uniformity of density was significantly lacking, leading to a significant decrease in contrast even after durability, and the characteristics were clearly worse than immediately after manufacture.

On the other hand, in Examples 1, 2, 3, and 4, the same image quality as immediately after manufacture was obtained, and no deterioration of characteristics occurred over time.

Example-5 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 anatase-type titanium oxide fine particles of μm were added and dispersed using a bead mill dispersion machine, and the viscosity was 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 15 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 1400 C. A diffuse reflection layer with a film thickness of 5 μm was provided.

Next, butyral resin (number average molecule fi40XlOs)
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 coated with a reverse roll coater at a coating speed of 4 m/min.

The film was coated with a gap of 20 μm, dried at 140° C. 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 a nylon resin different from the methoxymethyl-modified 6-nylon used in Example-5 and a comparative example using another resin were added using the same manufacturing method as Example-5.

Resin used White reflective layer thickness Example-66
/66/610/124 Original copolymerized nylon 5 μm Example-78 Nylon 5 μm Comparative example-4 Polyester 5 μm Comparative example-5 Polymethyl methacrylate 5 μm In addition to these, the following image quality features were obtained. For example, when the display is repeated frequently, a so-called ghost, in which the contents of the previous display screen slightly remain, occurred in Comparative Examples 4 and 5, but this ghost was not observed in Examples 5, 6, and 7, and the results were good. The display could be repeated.

Also, after one month had passed, the comparative example -4゜5
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-5 and 6°7, 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 4 and 5, the uniformity of density was significantly lacking and the contrast was significantly lowered even after durability, and the characteristics were clearly worse than immediately after production.

On the other hand, in Examples 5, 6, and 7, the same image quality as immediately after manufacture was obtained, and no deterioration of characteristics occurred over time.

Example-8 Using the paint used for the diffuse-reflection layer in Example-5, the roll gap of the reverse roll coater was narrowed, and a diffuse-reflection layer with a film thickness of 2 μm was formed with the other conditions being the same.

The dielectric layer is the same as that used in Example-5, with a thickness of 1 μm.
It was applied with m. In the same manner as in Example-8, the thickness of the diffuse reflection layer was sequentially set to 3 μm (Example-9) and 10 μm (Comparative Example-6).

Example 10 Using the paint used for the diffuse reflection layer in Example 5, a diffuse reflection layer having a thickness of 5 μm was formed under the coating conditions of Example 5.

The dielectric layer used in Example 5 was used, the roll gap of the reverse roll coater was widened, and the other conditions were kept the same to form a dielectric layer with a thickness of 2 μm. Example-
8, the thickness of the dielectric layer was sequentially increased to 4 μm (Comparative Example-7).
), 6 μm (Comparative Example-8).

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 to these, the following image quality features were obtained. For example, when the display is repeated frequently, a so-called ghost, in which the contents of the previous display screen slightly remain, occurred in Comparative Examples 7 and 8, but this ghost was not observed in Examples 8, 9, and 10゜11. Good display could be repeatedly performed.

Moreover, after one month had passed, the comparative example -7°8
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 8 and 9°10.11, there was no change in surface roughness and the aluminum of the substrate was not corroded. When the images were displayed, the uniformity of density was significantly lacking in Comparative Examples 7 and 8, and the contrast was significantly lowered even after durability, and the characteristics were clearly worse than immediately after production.

On the other hand, in Examples 8, 9, 10, and 11, the same image quality as immediately after manufacture was obtained, and no deterioration of characteristics occurred 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 not 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 and 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 and display device that exhibits high contrast, excellent recording or display characteristics, and high stability.

[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%")

Claims (3)

[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. A recording and displaying device in which electrically conductive colored magnetic fine powder is attached to a surface of the substrate, wherein the image holding member has at least a diffuse reflection layer in which reflective fine particles are dispersed in a resin mainly composed of polyamide. . (2) The recording and display device according to claim 1, wherein the image holding member has a whiteness of 60% or more. (3) The specific electrical resistance of the image holding member is 10^1^2Ω・c
The recording/displaying device according to claim 1, wherein the recording/displaying device is greater than or equal to m.