JPH0282251A - Recording display device - Google Patents

Abstract

PURPOSE:To improve contrast and durability by setting the electric resistance value of diffusing reflection layer of an image holding member smaller than the electric resistance of a dielectric layer positioned on the diffusing reflection layer. 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 the developer 1 to the image holding member 5. The image holding member 5 consists of a conductive mast supporting plate 7 (conductive layer), the 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 electric resistance value of the layer 6a is set smaller than that of the layer 6b. Therefore, a residual electric charge in the layer 6b is speedily discharged to a substrate through the layer 6a. 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. 5, and the magnetic conductive developer is colored on the non-magnetic cylinder 3 by its magnetic force. 1 is conveyed 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, the following various 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 cause diffuse reflection.

■ Method using aluminum anodic oxide film
(disclosed in Japanese Patent No. 1-46707), (2) 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, problems arise such as the electrical adsorption force of the developer changes depending on the environment, resulting in large fluctuations in the contrast of one image. 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. , a recording and display device in which a magnetic conductive developer is attached to an image holding member by applying a voltage between an electrode and an image holding member, the image holding member also comprising:
At least a conductive layer, a diffuse reflection layer in which reflective particles are dispersed in a resin, and a dielectric layer are laminated, and the electrical resistance of the diffuse reflection layer is set to a smaller value than the electrical resistance of the dielectric layer. It is characterized by

(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, during repeated use, the magnetic conductive developer seeps into micro-gaps, and the contrast decreases during repeated use due to sticking due to micro-irregularities on the surface.Furthermore, electrical resistance decreases due to adsorption of moisture through micro-gaps at high temperatures. This means that it is possible to prevent a decrease in contrast, and a decrease in contrast at high humidity can be significantly prevented.

Furthermore, due to the direct contact between the dielectric layer of the image holding member and the magnetic conductive developer, charges are injected from the magnetic conductive developer when a voltage is applied, thereby generating charges in the dielectric layer. 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 very poor charge removal efficiency, and the residual potential inside causes ghosting and reduced contrast during repetition.

In the present invention, since the electrical resistance of the diffuse reflection layer is smaller than the electrical resistance of the training layer, the charge on the diffuse reflection 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.

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

The structure of a model of an image holding member according to the present invention is illustrated in FIG. 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 0.1 gm to 5.0 gm expressed as a 10-point average roughness. In order to control and form zero surface roughness, which is set to be OILm, more preferably set to 1.0 gm to 3.5 pm, the dispersion state of reflective fine particles dispersed in the diffuse reflection layer and the coarse particle addition,
For the zero surface roughness determined by various methods such as replicas based on fluidity and shape during manufacturing, the average roughness of the 1O point at a measurement distance of 2.5 seconds is used.

The measuring device is a surface roughness meter manufactured by Taylor Hobson.
A universal surface profile measuring instrument rSE-30 manufactured by Koita Research Institute is used.

The recording/display function by adsorption of the magnetic conductive developer in the present invention is based on charges induced in the diffuse reflective layer 6aii electric layer 6b by an electric field.
The conditions are that the layer between the J and J conductive layers has sufficient electrical resistance and does not easily become conductive, or that it generates a substantial potential when charged and functions to produce sufficient contrast.

However, the state in which the image holding member 5 should function depends on the usage conditions, but if high contrast is aimed at as in the present invention, the state in which the image holding member 5 should function is 1001 seconds after charging.
Since it is necessary to maintain 50% or more of the initial charging voltage at ec or more, it is preferable that the specific electrical resistance between the dielectric layers 6b of the diffuse reflection layer 6a is set to 1012 Ω·c layer or more.
Diffuse reflection J#6 when aiming for higher contrast
The specific electrical resistance between the a dielectric layer 6b is preferably 1QI3Ω·c layer or more.The electrical resistance of the diffuse reflection layer 6a is set to a smaller value than the electrical resistance of the dielectric layer 6b.

In the recording/display device of the present invention, the display characteristics are proportional to the amount of charge generated in the dielectric layer 6b, and therefore are somewhat related to the degree of coloring of the magnetic conductive developer, but in principle, the film thickness between the dielectric layers 6b is Assuming that the voltage applied when forming the t1 display is V, it is desirable to satisfy the relationship V>15 (V/ILm)Xt (pm) to obtain sufficient contrast. In order to obtain this, it is desirable that V>20 (V/gm) xt (JLm). 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 should be 7JLm or less, preferably 5Bm.
The following are practical.

Examples of the resin forming the electrical training layer 6b include polyester, acrylic resin, polyolefin, polyacetal, polyamide, polystyrene, halogen-containing resin, silicone resin, polyether, polycarbonate, vinyl acetate resin, cellulose resin, and the like. Thermoplastic resins represented by copolymers of 9, fluorine resin, xylene resin9, petroleum resins, urea resins, melanin resins, unsaturated polyesters, alkyd resins, epoxy resins, silicone resins, furan resins, etc. alone or copolymers There are thermosetting resins represented by the following, 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, organic resin powder such as styrene resin powder, silicone resin powder, halogenated olefin resin powder (for example, polyethylene powder, polytetrafluoroethylene powder), acrylic resin powder, phenolic resin powder, melamine resin powder, etc. Or titanium oxide, magnesium oxide, calcium oxide, barium oxide, #zinc.

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.

Acrylic resin, polyolefin, polyacetal, polyamide, polystyrene, halogen-containing resin, silicon resin, polyether, polycarbonate, vinyl acetate resin,
Thermoplastic resins represented by fibers, II base resins, and copolymers of these, phetol resins, xylene resins, petroleum resins, urea resins, melanin resins, unsaturated polyesters, alkyd resins, epoxy resins, silicone resins, 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 convenience and practicality, whiteness is defined based on the reflection density obtained with a Macbeth densitometer or equivalent function, etc. 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 Cs expressed it as pure white.) Whiteness 0: Reflection density ≧ 1.44 (In the panel test, all Cs expressed it as black, and there was no contrast at all.71) 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 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 for increasing adhesiveness is provided in the middle to prevent separation of the diffuse reflection layer 6a and the diffuse reflection layer 6a. Further, the conductive layer 7 in the present invention
, 7a are layers having sufficiently low electrical resistance and are easily electrically connected. In other words, it is a layer that functions so as not to generate a substantial potential when charged. Therefore, the state in which the conductive layers 7, 7a should function 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 1710 m5ec or less. Since it can be said that the conduction state is sufficient if the attenuation is below, in this embodiment, the specific electrical resistance of the conductive layer 7.7a is set to about 10<12 >ohm/am or less.

If you are aiming for faster image display, 1m5 after charging.
Since it is required to attenuate the initial charging potential to 1110 or less 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 1m 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% 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 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 W1 powder, or
Further, if necessary, powders with unnecessary particle sizes are removed by 2-class classification, etc., to obtain the desired magnetic conductive developer. This generally has an average particle size of about 5 to 20 gm, and its specific electrical resistance is within the developer container at an applied voltage of too much.
V or less, those in the range of 103Ω・0 layer to 109Ω・C intestine are 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.

Reference numeral 5 denotes an image holding member formed in the shape of an endless belt, which 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.
It is hung around a pair of rollers 11°11', and the display section 18
It is movably supported on a plane by a backing 16 and rollers tt and it', 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 11', a magnetic conductive developer l as a display substance is adhered to the image holding member 5 according to the display information to form a display image. Image forming means 17 is provided. Note that the magnetic conductive developer l is stored in a container 9.

The information obtained from the document reading device 15 by the image forming means 17 is sent to the recording control section 1 via the storage device 114.
3 is applied to the recording electrode 4 as an electrical signal. Note that 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 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.

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. , the recording electrode 4 has an electrode width of 0.1 to 1 layer, an electrode spacing of 0.1 layer and 1 layer, and a voltage of 1.
Applied voltages of 0-100V are used. The moving speed of the image holding member 5 is set to 50 w 700 rn/sec, and the distance from the electrode 4 is set to about 50 to 500 pm.

The image holding member 5 was created as follows. First, 30 parts by weight of tin oxide fine particles with an average particle size of 0.5 JLm were melted and dispersed at 200°C to 30 parts by weight of polyester resin, which is a condensation polymer of terephthalic acid and ethylene glycol, and this dispersion was passed through a T-shaped die into a film. A white film with a thickness of 30 IL is provided by extruding the aluminum foil into a 50 ILm thick conductive layer and thermally laminating it on one side of the aluminum foil constituting the conductive layer. 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 was 109Ω・C (25°C, 150% RH).
Next, thermosetting phenolic resin (number average molecular weight 500)
A paint with a viscosity of 10 cps consisting of 90% methyl ethyl ketone and 90we% methyl ethyl ketone was applied using a reverse roll coater at a coating speed of 4 m 1 minute and a gap of 10 pm.
After drying at 40°C for 5 minutes, a dielectric layer with a thickness of IILm was placed on the diffuse reflection layer of the white film, and the surface roughness was 1.2J.
It was used as an image holding member of Lm.

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 iron oxide, and had an average particle size of 107 L and a specific electrical resistance of 106 Ωcm (100 V applied). It is.

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 2200 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 mm 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 inch layer and an electrode spacing of 0.25 inch layer. The prepared polyimide film having a thickness of 200 JLm was adhered to the outer surface of the non-magnetic 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 transferring at a speed of 0■■/sec.

The results are shown in Table-1.

In addition, Example 2 was manufactured using the same manufacturing method as Example 1, but with one condition slightly changed and the thickness of the diffuse reflection layer changed.
3 and added as Comparative Example-1.

Moreover, in order to clarify the effect more clearly, Comparative Example 2 was prepared by not providing a dielectric layer in Example 1.

Shiroshita Yuiro (Example-4) In this example, aluminum was vapor-deposited as a conductive layer to a film thickness of 80OA on the surface of the image holding member 5 to a polyester film having a thickness of 1100IL, and the paint was applied to a thickness of 30g by the following coating process. A diffuse reflection layer 6a having a surface roughness of 1.57 zm was formed.

To apply the paint, 54 parts by weight of reduced conductive zinc oxide powder with an average particle size of 1.0 gm and 30 parts by weight of a thermosetting phenol resin were dispersed in a ball mill for 10 hours with 700 parts by weight of methyl ethyl ketone. .2p
Coated with a mixture of m and a reverse roll coater, 140
Heated at ℃ for 5 minutes.

The specific electrical resistance of the diffuse reflection layer 6a is I x 109Ω-
cs (25° C., 150% RH), then a paint with a viscosity of 30 cps consisting of 10% soluble vinyl chloride/vinyl acetate resin (number average molecular weight 4×104) and 90% methyl ethyl ketone was applied using a reverse roll coater at a speed of 4 m/min.
The dielectric layer 6b with a film thickness IILm was applied on the diffuse reflection layer 6a of the white film, and the image retention with a surface roughness of 1.2lm was applied. Member 5 was manufactured.

Table 2 shows the recording/display characteristics of the image holding member 5 along with examples and comparative examples in which the coating conditions of the dielectric layer 6b were adjusted and the thickness of the dielectric layer 6b was increased.

In addition, by changing the composition ratio of the reduced conductive zinc oxide used in the diffuse reflection layer 6a in Example-4 (Table-
(Refer to 3) Table 4 shows the recording/display characteristics of Examples and Comparative Examples with different specific electrical resistances of the diffuse reflection layer 6a.

(Example-11) 80O on the surface of a 100 μm thick polyester film
Aluminum was deposited to a film thickness of A, and the paint was applied to a thickness of 30. 1Lm to form a diffuse reflection layer 6a.

Coating: antimony oxide powder 5 with an average particle size of 1.01 Lm
4 parts by weight and 30 parts by weight of a thermosetting phenolic resin were dispersed with 700 parts by weight of methyl ethyl ketone in a ball mill for 10 hours, and a mixture having a dispersed average particle size of 1.0 m was coated with a reverse roll coater. Heated for minutes. The specific electrical resistance of the diffuse reflection layer 6a was 108 Ω·cm (25° C., 150% RH).

Next, 2 soluble acrylic resin (number average molecular weight 4 x 104)
A paint with a viscosity of 30 cps consisting of 10% by weight and 90% by weight of methyl ethyl ketone was applied using a reverse roll coater at a coating speed of 4 m/min and a gap of 10 JLm.
Dry at 40°C for 5 minutes.

An image holding member 5 was manufactured by disposing a dielectric layer 6b having a film thickness of Lpm on the diffuse reflection layer 6a of the above-mentioned white film.

In this example, the resin for the dielectric layer 6b was coated in the same manner as in Example 1O using soluble vinyl alcohol resin, soluble vinyl pyridine resin, and soluble polyacrylic quaternary amine resin to form the image holding member 5. -12 and comparative examples -6 and 7.

Table 5 shows the recording and display characteristics of each image holding member.
Shown below.

Example 12 Comparative example of soluble vinyl alcohol resin for dielectric layer - Comparative example of 6M soluble vinyl pyridine resin for dielectric layer - 7 Soluble polyacrylic quaternary amine resin for dielectric layer - Below 4 steps - Implementation of the above As is clear from the examples, according to the present invention, 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. 3, the record display apparatus shown in FIG. 4 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', 19'' in a circularly movable manner, and is supported in a flat manner by rollers 19, 19' in one display section.In addition, near the roller 11, an image on the image holding member 5 and a writing medium 20 are placed. Cleaning member 1 for removing magnetic conductive developer attached to the back side of
2.12' is provided.

This cleaning member 12, 12' removes the magnetic conductive developer by moving the spikes of toner formed on the outer periphery of the cylindrical member by magnetic attraction in a brush shape that rotates five times. 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 irradiates the image on the two members 5 and 20, and the reflected light from both members 5 and 20 is installed. A mirror 27 is provided to make the image incident on 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 electrical resistance of the diffuse reflective layer is smaller than that of the dielectric layer, the charge on the diffuse reflective layer can be quickly attenuated, preventing a decrease in contrast during repeated use, and providing good stability. The image quality can be maintained.

[Brief explanation of the drawing]

FIGS. 1(a) and 1(b) are schematic cross-sectional views showing an image holding member of a recording and display device according to an embodiment of the present invention, and FIG.
3 is a vertical sectional view showing the overall configuration of the device shown in FIG. 2, and FIG. 4 is another embodiment of the present invention. FIG. 5 is a general longitudinal cross-sectional view of the recording/displaying device according to the present invention, and FIG. 5 is a principle diagram of the 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 Fig. 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 a recording/display device in which a magnetic conductive developer is attached to a magnetic conductive developer, 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, A recording/display device characterized in that the electrical resistance of the reflective layer is set to a smaller value than the electrical resistance of the dielectric layer.