JPH0776835B2 - Record display device - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a so-called magnestilus type recording and displaying apparatus for recording and displaying an image by attaching a magnetic conductive developer to an image holding member by an electric attraction force. .

(Prior Art) Conventionally, as a recording display device capable of displaying a high-definition and large-sized screen easily and inexpensively, a so-called magnestilus system has been proposed (for example, Japanese Patent Publication No. 51-4670).
(See publication 7). That is, the principle is to rotate the cylindrical magnet 2 in the non-magnetic cylinder 3 as shown in FIG. 5, and convey the colored magnetic conductive developer 1 on the non-magnetic cylinder 3 by its magnetic force. It is supplied onto the needle-shaped recording electrodes 4 densely arranged on the magnetic cylinder 3 along the axial direction.

Then, a voltage is applied between the conductive layer 7 of the image holding member 5 including the recording layer 6 on the front surface side and the conductive layer 7 on the back surface side and the recording electrode 4 according to the image information, and only the portion to which the voltage is applied is imaged. The magnetic developer 1 is attached to the holding member 5 to form an image.

(Problems to be Solved by the Invention) However, in the case of the above-mentioned conventional technique, high contrast,
It was insufficient in terms of long life, stability under low environment, high reliability, etc.

Therefore, various methods as described below have been considered as methods for increasing the contrast of the image holding member 5.

 A method of irregularly reflecting a light-reflecting surface.

Method using aluminum anodic oxide film
Disclosed in Japanese Patent Publication No. 46707).

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

A method in which a conductive layer 7 is laminated with a diffuse reflection layer in which fine particles are dispersed in a binder resin and a dielectric layer.

However, the method (1) is not preferable because the magnetic conductive developer is trapped in the recesses and the contrast is lowered.

In the other method, voltage leakage is likely to occur because cracks occur during anodization. Further, the same adverse effect as the method of making the surface uneven is generated. Furthermore, the whiteness of the anodic oxide film is low and the contrast cannot be sufficiently obtained. Furthermore, when the environment fluctuates, voltage leaks frequently occur, the density of recording or display is lowered, and various problems such as insufficient contrast can be obtained.

In the method (1), the initial whiteness is high and the contrast is excellent, but the magnetic conductive developer is trapped during repeated use due to the minute voids generated by dispersing the fine particles, and the contrast is lowered.

Further, when the temperature, humidity, etc. fluctuate, the adsorption and desorption of moisture in the remaining minute voids remarkably changes, and the electric resistance fluctuates greatly. Therefore, the electric attraction force of the developer changes depending on the environment, which causes a problem that the fluctuation of the image contrast is large. That is, under a high humidity, the adsorption of humidity remarkably progresses through a minute gap, resulting in a large decrease in electrical resistance, a small adsorption force of the magnetic conductive developer, and a reduction in contrast.

In the method (1), the initial whiteness is high and the environmental stability is excellent, but the whiteness tends to be slightly lowered after repeated use.

The present invention has been made to solve the above-mentioned problems of the prior art, and its object is to record an image by electrically adsorbing a magnetic conductive developer on an image holding member,
It uses a so-called magnes stylus method and shows high contrast and excellent recording or display characteristics.
Another object of the present invention is to provide a recording / displaying device which has little environmental dependency and is excellent in durability.

(Means for Solving the Problems) In order to achieve the above object, in the present invention, a recording electrode is provided so as to face the image holding member in an isolated manner, and the recording electrode is provided between the recording electrode and the image holding member. In a recording and display device in which a magnetic conductive developer is supplied to an image holding member and a voltage for recording is applied to the electrode to attach the magnetic conductive developer to the image holding member, the holding member is at least a conductive layer and a reflective layer. A diffuse reflection layer in which fine particles are dispersed in a resin and a dielectric layer are laminated, and the electric resistance of the diffuse reflection layer is set to a value smaller than the electric resistance of the dielectric layer.
The point average roughness is set to 0.1 μm to 5.0 μm.

(Operation) Since the diffuse reflection layer in which the reflective fine particles are dispersed in the resin can remove internal cracks and the like, it is possible to reduce the supplement of the magnetic conductive developer by the uneven surface of the surface and prevent the leakage of voltage.

In addition, since the reflective fine particles are dispersed in the resin,
The synergistic effect with the interface reflection due to the difference in the refractive index at the interface improves the whiteness and the contrast.

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

In addition, the magnetic conductive developer soaks into the microscopic voids during repeated use, and the contrast decreases during repeated use due to adhesion due to minute surface irregularities, and the electrical resistance due to adsorption of moisture through the microscopic voids during high humidity. It is possible to prevent the deterioration of the contrast, and it is possible to remarkably prevent the deterioration of the contrast at high humidity.

Further, when the dielectric layer of the image holding member is in direct contact with the magnetic conductive developer, charges are injected from the magnetic conductive developer when a voltage is applied, and as a result, charges are generated in the dielectric layer. At this time, if the electric resistance of the diffuse reflection layer constituting the image holding member is larger than the electric resistance of the dielectric layer, the charge attenuation in the diffuse reflection layer becomes slower than the charge attenuation in the dielectric layer. Since the electric charge stays at the interface with the diffuse reflection layer, the efficiency of static elimination is extremely low, and the potential remains inside, which causes ghost or a decrease in contrast during repetition.

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

If the surface roughness of the dielectric layer is 0.1 μm or less, the surface becomes too smooth and the dielectric layer and the magnetic conductive developer come into direct contact with each other to inject charges from the conductive magnetic developer. The electric field is likely to remain in the area, and a ghost and a decrease in contrast are likely to occur.

On the other hand, when the surface roughness of the dielectric layer is 5 μm or more, the magnetic conductive developer is captured on the surface irregularities and adheres 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 5 μm, a highly insulating void is formed between the dielectric layer and the magnetic conductive developer, and charge injection into the dielectric layer is prevented and Also, the developer is not captured by the fine irregularities on the surface.

(Example) Below, this invention is demonstrated based on the Example shown in figure.

The model configuration of the image holding member according to the present invention is shown in FIG. That is, (a) of the figure shows a structure in which the diffuse reflection layer 6a is laminated on one side of the conductive support 7 as a conductive layer, and (b) of the figure shows the conductive layer 7a on one side of the support 30. The structure in which the diffuse reflection layer 6a is laminated via the structure is shown.

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.
It is set to be in the range of μm to 5.0 μm, more preferably
It is set to 1.0 μm to 3.5 μm. The surface roughness can be controlled and formed by various methods such as the dispersion state of the reflective fine particles dispersed in the diffuse reflection layer, the addition of coarse particles, the fluidity at the time of production, and the replica depending on the shape. The surface roughness uses a 10-point average roughness at a measurement distance of 2.5 mm. As the measuring device, a surface roughness meter manufactured by Taylor Hobson, a universal surface shape measuring device “SE-3c” manufactured by Kosaka Laboratory, or the like is used.

Since the recording / display function by adsorption of the magnetic conductive developer in the present invention is due to the electric charge induced in the dielectric layer 6a of the diffuse reflection layer 6a by the electric field, the dielectric layer of the diffusion reflection layer 6a has a sufficient electric resistance. It is a condition that the layer that it has does not easily become a conductive state, or that it functions so as to generate a substantial potential upon charging and to generate a sufficient contrast.

Therefore, although there are some important points in which the condition to function as the image holding member 5 depends on the use conditions, for the purpose of high contrast as in the present invention, 50% or more of the initial charging voltage is 100 msec or more after charging. Therefore, the specific electric resistance between the diffuse reflection layer 6a and the dielectric layer 6b is 10 ¹² Ω.
・ It is preferable to set to cm or more. For higher contrast, the specific electric resistance between the diffuse reflection layer 6a and the dielectric layer 6b is preferably 10 ¹³ Ω · cm or more. This diffuse reflection layer 6a
The electric resistance of is set to a value smaller than the electric resistance of the dielectric layer 6b.

In the recording / display apparatus of the present invention, the display characteristics are the dielectric layer.
Since it is proportional to the amount of charge generated in 6b, it is somewhat related to the degree of coloring of the magnetic conductive developer, but in principle, the film thickness between the dielectric layers 6b is t, and the voltage applied when forming a display is V. Then, in order to obtain a sufficient contrast, it is desirable that the relationship of V> 15 (V / μm) × t (μm) is satisfied. In order to obtain higher contrast, V> 20 (V / μm) × t (μm) is desirable. Considering the matching with the driving circuit, a voltage of about 100 V or less is relatively easy to output, so the thickness of the dielectric layer 6b is 7 μm or less, preferably 5 μm or less.
A value of μm 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, fibrin resin, and the like. Thermoplastic resin represented by copolymer, or simple substance or copolymer such as petroleum resin, xylene resin, petroleum resin, urea resin, melanin resin, unsaturated polyester, alkyd resin, epoxy resin, silicone resin, furan resin, etc. There are representative thermosetting resins, and these can be mixed and used.

Further, it is possible to add an ion conductive substance, an ion conductive polymer, an electron conductive substance, an electron conductive polymer or the like to these resins to reduce the electric resistance.

The diffusive reflection layer 6a is formed of, for example, styrene resin powder, silicon resin powder, halogenated olefin resin powder (for example, polyethylene powder, polytetrafluoroethylene powder), acrylic resin powder, phenol resin powder, melamine resin powder, or other organic resin powder, Alternatively, metal oxides such as titanium oxide, magnesium oxide, calcium oxide, barium oxide, zinc oxide, tin oxide, antimony oxide and indium oxide, metal sulfates such as barium sulfate, magnesium sulfate and calcium sulfate, barium carbonate, magnesium carbonate, Reflective fine particles such as metal carbonates such as calcium carbonate, for example, polyester, acrylic resin, polyolefin, polyacetal, polyamide, polystyrene, halogen-containing resin, silicon resin, polyether, polycarbonate, vinyl acetate Thermoplastic resins represented by fats, fibrin-based resins, and copolymers thereof, or petroleum resins, xylene resins, petroleum resins, urea resins, melanin resins, unsaturated polyesters, alkyd resins, epoxy resins, silicone resins, It is a single substance such as a furan resin or a single substance such as a thermosetting resin typified by a copolymer, or a resin dispersed in a mixed resin.

In such a recording or displaying method, until now the whiteness was insufficient and the required contrast was not obtained, but in the present invention, the diffuse reflection layer 6a is composed of a binder resin and reflective fine particles dispersed therein. Therefore, a whiteness of 60% or more was obtained and sufficient contrast was obtained.

Further, since the recording / display device is required to have a low viewing angle dependence of contrast, that is, a device having excellent diffuse reflectance, it is necessary to increase the diffuse reflected light component.

There are several methods for defining diffuse reflectance, but in the present invention, the whiteness is defined based on the following from the reflection density obtained by a Macbeth densitometer or a product having the same function in view of its simplicity and practicality.

Whiteness = [(1.44-reflection density) / (1.44 + 0.04)] × 10
0 Whiteness 100: Reflection density ≤0.04 (Panel test describes almost all as pure white) Whiteness 0: Reflection density ≥1.44 (Panel test describes almost all as black. No contrast at all) Based on such a 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 unit. 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. Further, according to the research, it has been found that the effect of the present invention is not impaired even if an intermediate layer for enhancing the adhesiveness is provided in the middle to prevent the conductive layers 7 and 7a and the diffuse reflection layer 6a from peeling off. Further, the conductive layers 7 and 7a in the present invention are layers having a sufficiently low electric resistance, which are easily in a conductive state, in other words, a layer which functions so as not to generate a substantial potential during charging. Therefore, the state to be functioned as the conductive layers 7 and 7a has some factors depending on the use conditions, but when aiming for high contrast as in the present invention, after charging, the initial charging potential of 100 msec or less is charged. 1 /
Since it can be said that the conductive state is sufficient if it is attenuated to 10 or less, the specific electric resistance of the conductive layers 7 and 7a is set to about 10 ¹² Ω · cm or less in this embodiment.

For the purpose of faster image display, 1m sec after charging
Since it is required to reduce the electric potential to 1/10 or less of the initial charging potential below, the specific electric resistance of the conductive layers 7 and 7a is 10 ¹⁰ Ωcm.
The following is desirable.

The material forming the conductive layers 7 and 7a is aluminum, iron, gold,
Disperse the above conductive substance in powder form in a continuous phase such as a conductive metal such as tin or zinc, a conductive inorganic compound such as carbon, tin oxide, indium oxide or antimony oxide, or a continuous phase such as a polymer. In particular, in order to enhance the contrast for recording or display, it is desirable that the conductive layer has low light absorption and excellent light reflectivity.

Next, the magnetic conductive developer is not a condition limiting the present invention, but it is mainly used for the binder, the conductive powder, the magnetic material,
Further, if necessary, it is composed of various dyes and pigments as colorants.

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

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

As the magnetic material, ferric oxide or the like is used in an amount of 20 to 80% by weight.

In addition, the colorants used as needed include various phthalocyanines, malachite green and other dyes and pigments.
Used in the range of up to 20 wt%.

Heat each component listed above to about 100-300 ℃, mix evenly, cool, and pulverize to fine powder, or if necessary, remove powder of unnecessary particle size by 2 classification etc. Thus, the desired magnetic conductive developer can be obtained. It generally has an average particle size of 5 to 20 μm, and the specific electric resistance is 10 ³ Ω at an applied voltage of 100 V or less in the developer container.
・ The range of cm to 10 ⁹ Ω ・ cm is used.

Hereinafter, the present invention will be described more specifically with reference to Examples and Comparative Examples. 2 and 3 show a specific configuration of the recording / display 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 and the diffuse reflection layer 6. The image holding member 5 may have a belt shape that is not endless. The image holding members 5 are vertically arranged to face each other.
It is wound around a pair of rollers 11 and 11 ', is supported by the spine pulling 16 and the rollers 11 and 11' in the display section 18 so as to be planar and movable, and is driven in the arrow direction during image formation. At the lowermost position of the circulation path of the image holding member 5, that is, the position facing the roller 11, the magnetic conductive developer 1 as a display substance is attached to the image holding member 5 according to the display information to form a display image. Image forming means 17 is provided. The magnetic conductive developer 1 is contained in the container 9.

The information obtained from the document reading device 15 by the image forming means 17 is applied as an electric signal to the recording electrode 4 by the recording controller 13 via the recording device 14. In addition, 8 is a transparent plate, 12 is a cleaning member, and 18 is a display part.

As the cleaning member 12, blade cleaning,
Fur cleaning, suction cleaning, magnetic brush cleaning, brush cleaning, etc. can be provided. As a cleaning method, a method of electrically removing the electric charges induced on the image holding member through the cleaning member so as to remove the electric charges induced on the surface of the image holding member is more effective. For example, the image holding member A method of arranging a magnet adjacent to the surface and grounding with a conductive colored magnetic fine powder used for display interposed or a method of using a conductive brush is effective.

On the other hand, the general process conditions of the recording and displaying apparatus of the present invention will be introduced. First, a rotating magnet having a structure of 6 to 50 poles of about 500 to 2000 gauss and a rotation speed of 300 to 7000 rpm is used.
Use it by rotating around. As the non-magnetic cylinder 3, a molded product of a non-magnetic metal such as aluminum or stainless steel, or a simple substance or a composite of plastic or various inorganic oxides is used, which may be rotated or not rotated. . As the recording electrode 4, an applied voltage of 10 to 100 V with an electrode width of 0.1 to 1 mm and an electrode interval of 0.1 to 1 mm is used. The moving speed of the image holding member 5 is 50 to 700 m / sec. The distance from the electrode 4 is set to about 50 to 500 μm. The image holding member 5 was prepared as follows. First, 30 parts by weight of fine particles of tin oxide having an average particle size of 0.5 μm are added to 2 parts by weight of 30 parts by weight of a polyester resin, which is a condensation polymer of terephthalic acid and ethylene glycol.
It is melt-dispersed at 00 ° C., and this dispersion is extruded in a film form from a T-die and heat laminated on one side of an aluminum foil constituting a conductive layer having a thickness of 50 μm to provide a white film having a thickness of 30 μ. Then, the surface roughness of the white film was adjusted to 1.5 μm by applying pressure with a satin roller whose temperature was controlled to 200 ° C. The specific electric resistance of the diffuse reflection layer was 10 ⁹ Ω · cm (25 ° C / 50% RH). Next, a paint with a viscosity of 10 cps consisting of thermosetting phenolic resin (number average molecular weight 500) 10we% and methyl ethyl ketone 90we%
Reverse roll coater coating speed 4m / min Gap 10
Apply under conditions of μm, dry at 140 ℃ for 5 minutes, film thickness 1
An image holding member having a surface roughness of 1.2 μm was formed by providing a dielectric layer of μm on the diffuse reflection layer of the white film.

Next, the operation of the recording / display device having the above configuration will be described.

The magnetic conductive developer used was 30 parts by weight of bisphenol A type epoxy resin, 10 parts by weight of conductive carbon, and 60 parts of ferric oxide.
Composed of parts by weight, average particle size 10μ, specific electrical resistance 10 ⁶
Ω · cm (100V applied).

The rotating magnet 2 has a 16-pole structure of 900 gauss and an outer diameter of 36. The rotating magnet 2 rotates at a rotation speed of 22 in a direction opposite to the moving direction of the image holding member 5.
It is 00 rpm.

The non-magnetic cylinder 3 has a wall thickness of 1 mm and an outer diameter of 40, and is a polyimide film having a thickness of 200 μm in which electrodes 4 are provided by etching at an electrode width of 0.5 mm and an electrode interval of 0.25 mm at a position facing the image holding member 5. The film was adhered to the outer surface of the non-magnetic cylinder.
The voltage applied to the electrode 4 is 40V. Under such conditions, the image holding member 5 was moved at a speed of 220 mm / sec and the display function was examined. The results are shown in Table-1. Example-1
In the same manner as in Example 1, the surface roughness of the satin roller was changed variously to produce different surface roughness (0.1 to 5 μm).
Comparative examples 1 and 2 have surface roughnesses of 0.05 μm and 5.5 μm. Further, in order to further clarify the effect, Comparative Example-3 is the one in which the dielectric layer is not provided in Example-1.

(Embodiment 6) In this embodiment, the image holding member 5 is coated on the surface of a polyester film having a thickness of 100 μm with aluminum as a conductive layer having a thickness of 800 Å, and the coating material is applied to a thickness of 30 by a coating process described below.
It was applied to a thickness of μm to form a diffuse reflection layer 6a having a surface roughness of 1.5 μm. 54 parts by weight of reduced conductive zinc oxide powder with an average particle size of 1.0 μm and thermosetting phenolic resin 30
1 part by weight in a ball mill with 700 parts by weight of methanol
The mixture was dispersed for 0 hours, coated with a formulation having a dispersion average particle diameter of 1.5 μm by a reverse roll coater, and cured at 140 ° C. for 5 minutes. The specific electric resistance of the diffuse reflection layer 6a is 1 × 10 ⁹ Ω · cm (2
5 ° C./50% RH). Next, soluble vinyl chloride vinyl resin (number average molecular weight 4 × 10 ⁴ ) 10we%, methyl ethyl ketone 90we
% Paint with a viscosity of 30 cps was applied with a reverse roll coater at a coating speed of 4 m / min and a gap of 10 μm, dried at 140 ° C. for 5 minutes, and the dielectric layer 6b with a thickness of 1 μm was diffused from the white film. Provided on the reflective layer 6a, the surface roughness 1.2
An image holding member 5 of μm was manufactured.

The display characteristics of the image holding member 5 are shown in Table 2 together with Examples 7 and 8 and Comparative Example 4 in which the coating conditions of the dielectric layer 6b are adjusted and the surface roughness of the dielectric layer 6b is different (0.4 μm, 0.1 μm). Show.

In addition, by changing the composition ratio of the reduced conductive zinc oxide used for the diffuse reflection layer 6a in Example-6 as shown in Table-3, Comparative Examples 9 to 11 in which the specific electric resistance of the diffuse reflection layer is different The display characteristics of Examples 5 and 6 are shown in Table-4.

(Example-12) In this example, the image holding member 5 was formed by vapor-depositing aluminum with a thickness of 800 Å on a surface of a polyester film having a thickness of 100 µm, and coating the coating with a thickness of 30 µm by the following coating step. It is formed as a diffuse reflection layer having a surface roughness of 1.5 μm. In other words, the coating of paint has an average particle size of 1.0.
54 parts by weight of antimony oxide powder of 30 μm and 30 parts by weight of thermosetting phenolic resin were dispersed together with 700 parts by weight of methanol in a ball mill for 10 hours, and a preparation liquid having a dispersed average particle diameter of 1.5 μm was applied by a reverse roll coater, and the temperature was 140 ° C. Cured for 5 minutes. The specific electric resistance of the diffuse reflection layer is 1 × 10 ⁸ Ω
・ It was cm (25 ° C / 50% RH). Next, a coating composition of a soluble acrylic resin (number average molecular weight 4 × 10 ⁴ ) 10we% and methyl ethyl ketone 90we% with a viscosity of 30cps was applied with a reverse roll coater at a coating speed of 4m / min and a gap of 10μm, and the temperature was 140 ° C. After drying for 5 minutes, a dielectric layer having a film thickness of 1 μm was provided on the diffuse reflection layer of the above white film to manufacture an image holding member having a surface roughness of 1.2 μm. The dielectric layer 6b made of a soluble vinyl alcohol resin was used as Example 12, while the soluble vinyl pyridine resin and the soluble polyacrylic quaternary amine resin were used as Comparative Example 7. ,
Table 5 shows the characteristics of each image-holding member when the image-holding member was coated with 8 and applied in the same manner as in Example 12.

As is clear from the above examples, according to the present invention, excellent contrast and recording or display characteristics and repetition characteristics,
Environmental stability can be obtained. The present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the scope of the invention. For example, by adding a writing display function, a reading function, and a printing function to the recording display device shown in FIG. 3, the recording display device shown in FIG. 4 can be manufactured.

The image information to be displayed is input from the document reading device 15,
It is applied as an electric signal to the recording electrode 4 by the recording controller 13 from the encoding / decoding circuit 28 or directly from the encoding / decoding circuit 28 and the storage device 14.

Further, on the outer peripheral side of the image holding member 1, there is provided a writing medium 20 which is formed in an endless belt shape and is transparent and capable of writing and erasing with a felt pen or the like.
The roller 20 is looped around rollers 19, 19 'and 19 "so as to be able to circulate, and is supported in a plane by the rollers 19 and 19' in the display portion. Further, in the vicinity of the roller 11, on the image holding member 5. Cleaning members 12 and 12 'for removing the magnetic conductive developer adhering to the back surface of the image and the writing medium 20 are provided.

The cleaning members 12 and 12 'are for removing the magnetic conductive developer by moving the ears of toner formed on the outer circumference of the cylindrical member by a magnetic attraction force in a rotating brush shape. Below the roller 19 ', an erasing member 21 for erasing an image written on the writing medium 20 is arranged.

Further, on the back side of the image holding member 5, a reading means 22 for reading an image 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, a reflection shade that illuminates the images on both members 5 and 20.
A lamp 24 with a lamp 23 is provided, and a mirror 27 that allows reflected light images from both members 5 and 20 to enter a photoelectric conversion element 26 via a lens 25 is provided.

The images on the image holding member 5 and the writing medium 20 are read by the photoelectric conversion element 26 and recorded in 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 display surface having excellent whiteness can be formed by the diffuse reflection layer, and the contrast can be improved.

Also, by laminating a dielectric layer on the surface of the diffuse reflection layer,
The irregularities on the surface of the diffuse reflection layer can be removed, and moisture can be prevented from entering the diffuse reflection layer by the dielectric layer, so that the environmental characteristics can be improved and the durability can be improved.

Furthermore, since the electric resistance of the diffuse reflection layer is made smaller than that of the dielectric layer, the electric charge in the diffuse reflection layer can be quickly attenuated, and the deterioration of contrast during repeated use can be prevented, resulting in good stability. The image quality can be maintained.

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

[Brief description of drawings]

1 (a) and 1 (b) are schematic sectional views showing an image holding member of a recording / display apparatus according to an embodiment of the present invention, and FIG. 2 is a recording using the image holding member of FIG. FIG. 3 is a vertical cross-sectional view showing the main structure of the display device, FIG. 3 is a vertical cross-sectional view showing the whole structure of the device shown in FIG. 2, and FIG. 4 is a whole vertical cross-sectional view of a recording display device according to another embodiment of the present invention. FIG. 5 is a principle diagram of a conventional recording and displaying apparatus. Explanation of symbols 1 ... Magnetic conductive developer, 4 ... Electrode 5 ... Image holding member, 6a ... Diffusion display layer 6b ... Dielectric layer, 7, 7a ... Conductive layer

Continuation of the front page (56) Reference JP-A-58-102945 (JP, A) JP-A-58-48060 (JP, A) JP-A-55-140848 (JP, A) JP-A-58-72147 (JP , A)

Claims (1)

[Claims] 1. A recording electrode is provided so as to face the image holding member in isolation from the image holding member, a magnetic conductive developer is supplied between the recording electrode and the image holding member, and a voltage for recording is applied to the electrode. Thus, in the recording display device in which the magnetic conductive developer is attached to the image holding member, the image holding member is formed by laminating at least a conductive layer, a diffuse reflection layer in which reflective fine particles are dispersed in resin, and a dielectric layer. A recording display characterized in that the electric resistance of the diffuse reflection layer is set to a value smaller than the electric resistance of the dielectric layer, and the 10-point average roughness of the dielectric layer is set to 0.1 μm to 5.0 μm. apparatus.