JPH0282252A - Recording display device - Google Patents

Abstract

PURPOSE:To improve contrast and durability by setting the ten-point average roughness of the dielectric layer of an image holding member to a specific value. CONSTITUTION:An electrode 4 is disposed in such a way that it is oppositely isolated from the image holding member 5, magnetically conductive developer 1 is attracted to the electrode 4 by means of magnetism, and a voltage is applied between the electrode 4 and the image holding member 5, thereby attaching a developer 1 to the image holding member 5. The image holding member 5 consists of a conductive mast supporting plate 7 (conductive layer), a diffusing reflection layer 6a, and a dielectric layer 6b all of which are stuck together, the layer 6a being formed by dispersing reflecting grains in resin. The ten-point average roughness of the layer 6b is set to 0.1-5.0mum. Since highly insulating space is created between the layer 6b and the developer 1, an electric charge is prevented from being ejected into the layer 6b and the developer 1 is not taken into the minutely uneven surface. This improves contrast, the environmental characteristic, and durability.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a so-called magnetic stylus type recording and display device that records and displays an image by attaching a magnetic conductive developer to an image holding member using electrical adsorption force. .

(Prior Art) So-called magnetic stylus type recording and display devices have been proposed as recording and display devices that enable high-definition, large-screen display easily and inexpensively (for example, the magnetic stylus type).
6707), the principle is that a cylindrical magnet 2 is rotated within a non-magnetic cylinder 3 as shown in FIG. 4, and the magnetic conductive developer is colored on the non-magnetic cylinder 3 by its magnetic force. 1 is transported and supplied onto needle-shaped recording electrodes 4 that are densely arranged along the axial direction on the non-magnetic cylinder 3.

Then, a voltage is applied between the recording electrode 4 and the conductive layer 7 of the image holding member 5, which is composed of the recording layer 6 on the front side and the conductive layer 7 on the back side, and only the portion to which the voltage is applied is imaged. An image is formed by attaching a magnetic developer l to the holding member 5.

(Problem to be solved by the invention) However, in the case of the above-mentioned prior art, high contrast,
It was insufficient in terms of long life, stability in low environments, high reliability, etc.

Therefore, various first-order methods have been considered as methods for increasing the contrast of the image holding member 5.

■ A method of making the light reflecting surface uneven to reflect light.

■ Method using aluminum anodic oxide film
1-46707).

■ A method of laminating a diffuse reflection layer in which fine particles are dispersed in a binding resin on the conductive layer 7.

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

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

In addition, with the method (■), cracks occur during anodization, which tends to cause voltage leaks, and the surface becomes uneven.
This method causes the same disadvantages. Furthermore, the whiteness of the anodic oxide film is low, making it impossible to obtain sufficient contrast. Furthermore, when the environment changes, voltage leaks occur frequently, resulting in various problems such as a decrease in recording or display density and insufficient contrast.

In the method (2), the initial whiteness is high and the contrast is excellent, but the magnetic conductive developer is trapped 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, a decrease in the adsorption force of the magnetic conductive developer, and 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 to solve the problems of the prior art described above, and its purpose is to record an image by electrically adsorbing a magnetic conductive developer onto an image holding member.

It uses the so-called magnetic stylus method and exhibits high contrast and excellent recording or display characteristics.
Furthermore, it is an object of the present invention to provide a recording/displaying device that is less dependent on the environment and has excellent durability.

(Means for Solving the Problems) In order to achieve the above object, in the present invention, an electrode is disposed to be isolated and face the image holding member, and a magnetic conductive developer is magnetically attracted to the electrode. , by applying a voltage between the electrode and the image bearing member.

In a recording and display device in which a magnetic conductive developer is attached to an image holding member, the image holding member is also laminated with at least a conductive layer, a diffuse reflection layer in which reflective fine particles are dispersed in a resin, and a dielectric layer. It is characterized by having a 10-point average roughness of the dielectric layer set to 0.14 m to 55-0 JL.

(Function) The diffuse reflection layer in which reflective fine particles are dispersed in the resin can remove internal cracks, etc., thereby reducing the capture of the magnetic conductive developer by the uneven surface and preventing voltage leakage.

In addition, because reflective particles are dispersed in the resin,
The synergistic effect of the refractive index difference at the interface with interfacial reflection improves whiteness and contrast.

Further, by providing a dielectric layer on the diffuse reflection layer, it is possible to remove minute irregularities caused by reflective fine particles remaining on the surface of the diffuse reflection layer and minute voids generated inside the layer.

In addition, the magnetic conduction 7' into the microgap during repeated use
This prevents contrast deterioration during repeated use due to penetration of rL developer and adhesion due to minute irregularities on the surface, as well as decrease in electrical resistance due to adsorption of moisture through minute voids at high humidity, and improves contrast at high humidity. This means that the decline can be significantly prevented.

Further, when the surface roughness of the dielectric layer is 0.17 im or less,
When the surface becomes too smooth, the dielectric layer and the magnetic conductive developer come into direct contact and charge is injected from the electromagnetic developer, making it easy for an electric field to remain inside the dielectric layer, resulting in ghosting and reduced contrast. Yasushi~

On the other hand, if the surface roughness of the dielectric layer is 5 gm or more, the magnetic conductive developer will be trapped by the surface irregularities and will stick to the surface, resulting in a decrease in contrast.

In the present invention, by setting the surface roughness in the range of 0.1 to 54 m, a highly insulating gap is formed between the dielectric layer and the magnetic conductive developer, and charge injection into the dielectric layer is prevented. At the same time, the developer is not captured by minute irregularities on one surface.

(Example) The present invention will be explained below based on illustrated embodiments.

The structure of the model of the image holding member according to the present invention is illustrated in figure 1. That is, the figure (a) shows a structure in which a diffuse reflection layer 6a is laminated on one side of a conductive support 7 as a conductive layer, and the figure (b) shows a structure in which a conductive layer 7a is laminated on one side of a support 30. This shows a structure in which a diffuse reflection layer 6a is laminated with the diffuse reflection layer 6a interposed therebetween.

A dielectric layer 6b mainly made of resin is laminated on the diffuse reflection layer 6a.

The surface roughness of this dielectric layer 6b is expressed as a 10-point average roughness of 0.1 lm to 5.0 m. OJLm, more preferably set to 1.0 μm to 3.5 pm.
In order to control the surface roughness, it is necessary to measure the surface roughness by various methods such as the dispersion state of reflective fine particles dispersed in the diffuse reflection layer, the addition of coarse particles, the flowability during manufacturing, the replica by shape, etc. Pressure! A 10-point average of 2.51111 is used. As measuring instruments, a surface roughness meter manufactured by Taylor Hobson Co., Ltd., a universal surface shape measuring device rSE-3CJ manufactured by Koita Institute, etc. are used.

The recording/display function by adsorption of the magnetic conductive developer in the present invention is based on charges induced in the diffuse reflection layer 6a:A conductive layer 6b by an electric field.
The conditions are that the dielectric layers have sufficient electrical resistance and do not easily become electrically conductive, or that they generate a substantial potential when charged and function to produce sufficient contrast.

Therefore, the state in which the image holding member 5 should function depends somewhat on the conditions of use, but if high contrast is aimed at as in the present invention, the state in which the image holding member 5 should function is
sec or more, it is necessary to maintain 50% or more of the initial charging voltage, so it is preferable to set the specific electrical resistance between the diffuse reflection layer 6a and the dielectric layer 6b to 1QI2Ωcm or more, to achieve a higher contrast. In this case, diffuse reflection layer 6
It is desirable that the specific electrical resistance between the a-dielectric layers 6b is 10<13>Ω·cm or more.

Further, the electrical resistance of the diffuse reflection layer 6a of the image holding member is set to a smaller value than the electrical resistance of the dielectric layer 6b. If the electrical resistance of the diffuse reflection layer 6a is larger than the electrical resistance of the dielectric layer 6b, the charge decay in the diffuse reflection layer will be slower than the charge decay in the dielectric layer, so that the charge injected into the dielectric layer will be Since it remains at the interface, the efficiency of static elimination is extremely poor, and the residual potential inside causes ghosting and a decrease in contrast during repetition.

As in this example, 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 remaining charge, and is effective in eliminating ghosts and preventing contrast deterioration during repetition. It is.

In the recording/displaying device of the present invention, the display characteristics are proportional to the amount of charge generated in the dielectric layer 6b, so although it is somewhat related to the degree of coloring of the magnetic conductive developer, in principle, the display characteristics are proportional to the amount of charge generated in the dielectric layer 6b.
The film thickness between them is t, and the voltage applied when forming the display is V.
Therefore, to obtain sufficient contrast, it is desirable to satisfy the relationship V>15 (V/ILm)xt (ILm), and to obtain even higher contrast, it is desirable to satisfy the relationship V>20 (V/ILm)Xt. (pm) is desirable. Considering matching with the drive circuit, it is relatively easy to output a voltage of about 100V or less, so the thickness of the dielectric layer 6b is 7ILm or less, preferably 5ILm.
m or less is practical.

Examples of the resin forming the dielectric layer 6b include polyester, acrylic resin, polyolefin, polyacetal, polyamide, polystyrene, halogen-containing resin, silicon resin, polyether, polycarbonate, vinyl acetate resin, textile resin, and these. Thermoplastic resins represented by copolymers, or single or copolymers such as phetol resin, xylene resin, petroleum resin, urea resin, melanin resin, unsaturated polyester, alkyd resin, epoxy resin, silicone resin, furan resin, etc. There are typical thermosetting resins, and these can also be used in combination.

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 6a is made of, for example, an organic resin such as styrene resin powder, silicone resin powder, norogenated olefin resin powder (for example, polyethylene powder, polytetrafluoroethylene powder), acrylic resin powder, phenolic resin powder, or melamine resin powder. Powder or titanium oxide, magnesium oxide, calcium oxide, barium oxide, zinc oxide.

Metal oxides such as tin oxide, antimony oxide, indium oxide, barium sulfate, magnesium sulfate.

Metal sulfates such as calcium sulfate, barium carbonate.

Reflective particles such as metal carbonates such as magnesium carbonate and calcium carbonate, for example, polyester.

Thermoplastic resins represented by acrylic resins, polyolefins, polyacetals, polyamides, polystyrenes, halogen-containing resins, silicone resins, polyethers, polycarbonates, vinyl acetate resins, cellulose resins, and copolymers thereof, or Phetol resin, xylene resin 2
Petroleum resin, urea resin, melanin resin, unsaturated polyester, alkyd resin, epoxy resin, silicone resin,
It is a single substance such as furan resin or a thermosetting resin typified by a copolymer, or it is dispersed in a mixed resin.

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 6a is composed of a binding resin and reflective fine particles dispersed therein. As a result, a whiteness of 60% or more can be obtained and sufficient contrast can be obtained.

Furthermore, recording and display devices are required to have less dependence of contrast on the viewing angle, that is, to have excellent diffuse reflection properties, so it is necessary to increase the diffuse reflection light component.

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

Whiteness = [(1,44-reflection density)/(1,44+0
．． April x 100 Whiteness 100: Reflection density ≦0.04
(In the panel test, all members of C expressed it as pure white.) Whiteness 0: Reflection density ≧ 1.44 (In the panel test, all members expressed it as black, and there was no contrast at all.) Based on this definition of whiteness The contrast of recording or display can be defined as the difference between the whiteness of the image holding member 5 and the whiteness of the recording or display section. therefore,
A decrease in the whiteness of the image holding member 5 inevitably results in a decrease in contrast, resulting in insufficient recording or display. Research also shows that the conductive layer 7.7
It has been found that the effects of the present invention are not impaired even if an intermediate layer is provided in the middle to increase adhesion in order to prevent separation between the diffuse reflection layer 6a and the diffuse reflection layer 6a. Further, the conductive layer 7 in the present invention
．． 7a is a layer that has a sufficiently low electrical resistance and is easily brought into conduction; in other words, it is a layer that takes care not to generate a substantial potential when charged. Therefore, the state that the conductive layer 7.7a should be in depends on some factors depending on the conditions of use, but when aiming for high contrast as in the present invention, after charging, the initial charging potential is lower than 100 m5ec. If the attenuation is 1/10 or less, it can be said that the conduction state is sufficient, so in this embodiment, the specific electrical resistance of the conductive layer 7.7a is set to about 1Q12Ω·c+s or less.

If you are aiming for faster image display, 1m5 after charging.
Since it is required to attenuate to 1/10 or less of the initial charging potential at ec or less, it is desirable that the specific electrical resistance of the conductive layer 7.7a is IQIOΩ·cm or less.

The materials forming the conductive layers 7 and 7a include aluminum, iron,
The above-mentioned conductive substances are powdered in a continuous phase such as a simple substance or a composite of conductive metals such as gold, tin, and zinc, conductive inorganic compounds such as carbon, tin oxide, indium oxide, and antimony oxide, or polymers. It is dispersed,
In particular, in order to enhance the contrast in recording or display, it is desirable that the conductive layer has low light absorption and excellent light reflection.

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

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

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, ferric oxide etc. is 20 to 80% by weight.
used.

Furthermore, the coloring agents used as needed include dyes and pigments such as various phthalocyanines and malachite green.
It is used in a range of 5 to 20% by weight.

Heat each component listed above to about 100 to 300°C, mix uniformly, cool, and grind into fine powder, or if necessary, remove powder with unnecessary particle size by 2-class classification, etc. For example, the desired magnetic conductive developer can be obtained. It generally has an average particle size of about 5 to 20 gm,
The specific electrical resistance is determined by the applied voltage of 100V in the developer container.
In the following, those in the range of 1O3Ω·0 layer force) to 109Ω·C will be used.

Hereinafter, the present invention will be explained in more detail with reference to Examples and Comparative Examples. FIG. 2 and FIG. 3 show a specific configuration of the recording/displaying device.

5 is an image holding member formed in the shape of an endless belt.

It is composed of the conductive support 7 as the conductive layer described above and the diffuse reflection layer 6. Note that the image holding member 5 may be in the form of a belt that is not endless. , 11', and is movably supported on a plane 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 5, that is, at the position facing the roller tt',
An image forming means 17 is provided for attaching a magnetic conductive developer l as a display material to the image holding member 5 in accordance with display information to form a display image. Note that the magnetic conductive developer l is stored in a container 9.

The information obtained from the document reading wave m15 by the image forming means 17 is sent to the recording control section 13 via the storage device 14.
is applied to the recording electrode 4 as an electrical signal. In addition,
8 is a transparent plate, 12 is a cleaning member, and 18 is a display section.

As the cleaning member 12, blade cleaning, fur cleaning, suction cleaning, magnetic brush cleaning, brush cleaning, etc. can 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 placing magnets adjacent to the surface and interposing conductive colored magnetic fine particles used for display 1 to ground the surface, or using a conductive brush.

On the other hand, to introduce the general process conditions of the recording and display device of the present invention, first, the rotating magnet 2 has a configuration of about 6 to 50 poles and a rotation speed of about 500 to 2000 Gauss.
It is used by rotating at about 00 to 7000 rpm. As the non-magnetic cylinder 3, 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 the recording electrode 4, an electrode width of 0.1-1 .mu.W, an electrode spacing of 0.1-1 ira, and an applied voltage of 10-100 volts are used. Image holding member 5
The moving speed is set to 50 to 700 m/sec, and the distance from the electrode 4 is set to about 50 to 500 ILm.

The image holding member 5 was created as follows. First, 30 parts by weight of tin oxide fine particles having an average particle size of 0.5 Bm were melted and dispersed at 200°C to 30 parts by weight of a polyester resin which is a condensation polymer of terephthalic acid and ethylene glycol.
This dispersion was extruded into a film through a T-shaped die to a thickness of 5 mm.
A white film with a thickness of 30 #L is provided on one side of the aluminum foil constituting the 0 gm conductive layer by thermal lamination. Thereafter, the surface roughness of the white film was set to 1.51 Lm by applying pressure with a matte roller whose temperature was controlled at 200°C. The specific electrical resistance of the diffuse reflection layer is 1
09 Ω-cm (25°C, 150% RH), then thermosetting phenolic resin (number average molecule, 1500) lo
ve%, methyl ethyl ketone 90we% viscosity 1
0 cps paint was applied using a reverse roll coater at a coating speed of 4 m/min with a gap of 10 IL m, and 14
After drying at 0°C for 5 minutes, a dielectric layer with a thickness of 17 zm was placed on the diffuse reflection layer of the white film, and the surface roughness was 1.2 lm.
It was made into an image holding member.

Next, the operation of the recording/displaying device having the above configuration will be explained.

The magnetic conductive developer 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 ferric oxide, and had an average particle size of 10p and a specific electrical resistance of 106Ω·ci+ (100V applied). be.

Further, the rotating magnet 2 has a 16-pole configuration and has a power of 900 Gauss.

The one in the outer diameter 36 is rotated at a rotation speed of 220 rpm in the direction opposite to the moving direction of the image holding member 5.

The non-magnetic cylinder 3 has a wall thickness of 1 am and an outer diameter of 40 mm, and electrodes 4 are etched at a position facing the image holding member 5 with an electrode width of 0.5 and an electrode interval of 0.25 m. The provided polyimide film with a thickness of 200 pm was adhered to the outer surface of the nonmagnetic cylinder 3. The voltage applied to the electrode 4 was 40V.

Under such conditions, the image holding member 5 is
The display function was investigated by transporting at a speed of . Table 1 shows the results.
In addition, the surface roughness of the matte roller was variously changed in the same manner as in Example 1 to obtain different surface roughnesses (0.1 to 5.
4m) were manufactured as Examples 2, 3, and 4.5, and those with surface roughness of 0.051Lm, 5.5p, and m were manufactured as Comparative Examples 1, 2. It is shown as Moreover, in order to clarify the effect more clearly, Comparative Example 3 was prepared by not providing a dielectric layer in Example 1.

4 Lower 4' (Example 6) In this example, the image holding member 5 was formed by vapor-depositing aluminum as a conductive layer on the surface of a polyester film with a thickness of 800 A, and applying paint by the following coating process. It was applied to a thickness of 30 gm to form a diffuse reflection layer 6a with a surface roughness of 1.5 gm.

When applying paint, the average particle size is 1. 54 parts by weight of OILm barium sulfate powder and 30 parts by weight of thermosetting phenolic resin,
The mixture was dispersed with 810 parts by weight of methanol in a ball mill for 10 hours, coated with a prepared solution having a dispersed average particle diameter of 1.51 Lm using a reverse roll coater, and heated at 140° C. for 5 minutes.

Next, soluble PVC/PVC resin (number average molecular weight 4XlO
') A paint with a viscosity of 30 cps consisting of 10% and 90% methyl ethyl ketone was applied using a reverse roll coater at a coating speed of 4 m/min with a gap of 1 Opm, and dried at 140°C for 5 minutes to form a dielectric layer with a film thickness of 17 Lm. 6b
was provided on the diffuse reflection layer 6a of the above white film to produce an image holding member 5 with a surface roughness of 1.2 JLm.

The coating conditions of the dielectric layer 6b were adjusted and the surface roughness of (0.4 lm, 0.1) is shown in Table 2, together with Example 7.8 and Comparative Example 4.

Dielectric layer 6b μm) Implementation Image holding member 4T-gold (Example 9) In this example, the image holding member 5 was formed by vapor depositing aluminum on the surface of a polyester film with a thickness of 100 meters to a thickness of 11 layers of 80OA. , apply the paint to a thickness of 3 using the following application process.
It was coated with a coating thickness of 0%, and was formed as a diffuse reflection layer with a surface roughness of 1' and a thickness of 5gm. That is, the coating was applied using barium sulfate powder with an average particle size of 1.0 m;
and 30 parts by weight of thermosetting phenolic resin were dispersed in a ball mill for 10 hours with 810 parts by weight of methanol, and a mixture having a dispersed average particle size of 1.54 m was applied using a reverse roll coater, and heated at 140°C for 5 minutes. .

Next, soluble acrylic resin (number average molecular weight 4XIO'
) and 90we% of methyl ethyl ketone with a viscosity of 30 cps was applied using a reverse roll coater at a coating speed of 4 m/min and a gap of 10 pm, and dried at 140°C for 5 minutes to form a dielectric layer with a film thickness of IJLm. Provided on the diffuse reflection layer of the white film described above, surface roughening 1.
A 2gm image bearing member was manufactured.

The recording-display characteristics of the image holding member 5 are shown in Examples and Comparative Examples in which the surface roughness of the dielectric layer 6b is different by adjusting the coating conditions of the dielectric layer 6b, and in the case where no dielectric layer is provided.
Shown in 3.

As is clear from the following cold chasing examples, the present invention provides excellent contrast, recording or display characteristics, and repeatability.
Environmental stability can be obtained.

It should be noted that the present invention is not limited to the embodiments described above, and can be implemented with various modifications without changing the gist. For example, by adding a writing display function, a reading function, and a printing function to the record display apparatus shown in FIG. 1, the record display apparatus shown in FIG. 3 can be manufactured.

Image information to be displayed is input from the document reading device 15 and sent as an electrical signal to the recording electrode 4 by the recording control unit 13 from the encoding/decoding circuit 28 via the encoding/decoding circuit 28 and the storage device 14 or directly from the encoding/decoding circuit 28. applied.

Further, on the outer circumferential side of the image holding member 1, a writing medium 20 is disposed in the form of an endless belt and is transparent and capable of being written on and erased with a felt pen or the like. 19', fl to l9''
It is hung around a movable ring, and the rollers 19, 1 are displayed in the display section.
It is supported in a planar manner by 9'. Further, in the vicinity of the roller 11, a cleaning member 12, 12' is provided for removing the image on the image holding member 5 and the magnetic conductive developer adhering to the back surface of the writing medium 20.

The cleaning member 12, 12' removes the magnetic conductive developer by moving toner spikes formed on the outer periphery of the cylindrical member by magnetic attraction in a rotating brush shape. An erasing member 21 for erasing an image written on the writing medium 20 is disposed below the roller 19'.

Further, on the back side of the image holding member 5, a reading means 22 for reading images on the image holding member 5 and the writing medium 20 is arranged.

That is, at the reading position which is the closest position between the image holding member 5 and the writing medium 20, there is a lamp 24 with a reflective shade 23 that illuminates the image on the two members 5 and 20.

A mirror 27 is provided to make the reflected light images from both members 5 and 20 enter the photoelectric conversion element 26 via the lens 25.

The images on the image holding member 5 and the writing medium 20 are read by the photoelectric conversion element 26 and recorded on the printer 29 directly via the encoding/decoding circuit 28 or via the storage device 14.

(Effects of the Invention) The present invention has the above-described configuration and operation, and the diffuse reflection layer can form a display surface with excellent whiteness and improve contrast.

In addition, by laminating a dielectric layer on the surface of the diffuse reflection layer,
Not only can unevenness on the surface of the diffuse reflection layer be removed, but also the dielectric layer can prevent moisture from entering the diffuse reflection layer, improving environmental characteristics and improving durability.

Furthermore, since the surface roughness of the dielectric layer is set within an appropriate range of 0.1 to 0.5 pm, good image quality can be maintained over a long period of time.

[Brief explanation of the drawing]

FIGS. 1(a) and 1(b) are schematic sectional views showing an image holding member of a recording and display device according to an embodiment of the present invention, and FIG.
FIG. 1 is a vertical cross-sectional view of the main structure of a recording and display device using the image holding member shown in FIG. 1, FIG. 3 is a vertical cross-sectional view showing the overall structure of the device shown in FIG. FIG. 5, which is an overall vertical sectional view of the recording/displaying device according to the embodiment, is a principle diagram of a conventional recording/displaying device. Explanation of symbols 1... Magnetic conductive developer 4... Electrode 5... Image holding member 6a... Diffusion display layer 6b... Dielectric layer
7, 7a... Conductive layer agent Kazunobu Sera, patent attorney Figure 3

Claims (1)

[Scope of Claims] The image holding member is manufactured by disposing an electrode isolated and facing the image holding member, magnetically adsorbing a magnetic conductive developer to the electrode, and applying a voltage between the electrode and the image holding member. In the recording and display device in which a magnetic conductive developer is attached to the image holding member, the image holding member is constructed by laminating at least a conductive layer, a diffuse reflection layer in which reflective fine particles are dispersed in a resin, and a dielectric layer, and the dielectric layer 10-point average roughness of 0.1 μm to 5
．． A recording/displaying device characterized in that the recording/displaying device is set to 0 μm.