JPH01121889A - Image holding member - Google Patents

Abstract

PURPOSE: To obtain a high contrast and excellent recording and display characteristics by laminating a diffusion reflection layer contg. particulates having electrical conductivity in a diffusion reflection layer formed by dispersing particulates into a binder resin on the conductive layer of an image holding member. CONSTITUTION: The image holding member 5 consists of two-layered constitution composed of the conductive layer 7 and the recording layer (diffusion reflection layer) 6 or three-layered composed of a base 30, the conductive layer 7 and the recording layer (diffusion reflection layer) 6. Namely, the image holding member 5 consists of at least the conductive layer 7 and the diffusion reflection layer 6 which is formed by dispersing the particulates into the binder resin and is laminated on the layer 7. In addition, the particulates having at least the electrical conductivity are incorporated into the reflection layer 6. As a result, the high contrast and the excellent recording and display characteristics are obtd.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a display device for displaying unexploded aAFI colored powder by fixing it using electrical adsorption force. More specifically, it is intended to achieve high contrast, long life, and low soil dependence, which are the basic performances of a display device.

[Conventional technology]

As a display device, especially as an electrical display device, CR7
Displays, liquid crystal displays 1Light-emitting diode displays, fluorescent displays, plasma displays, electrophoretic displays, electrochromic displays, etc. are well known, but displaying large screens requires advanced technology and is extremely difficult. Is it expensive or
Moreover, it has various drawbacks, such as a decrease in the definition of the display, and the fact that the display flickers, causing severe visual fatigue.

Several new display devices have been proposed to replace these display devices.

■ A method of displaying a photoconductive layer by electrically adsorbing a conductive colored derivative at the same time as exposure. (Special application 1982-197
410) (2) A method of forming an electric latent image on a dielectric material using a pin electrode or the like, and electrically adhering an insulating colored differential material to the electric latent image to display the image. (Japanese Utility Model Publication No. 57-55061) ■ A method of electrically adsorbing and displaying conductive colored fine powder on a dielectric material using a pin electrode, etc. (Special Publication No. 57-51) How to display magnetic adsorption force.

In principle, some of these display methods are capable of high-definition display, can be easily and inexpensively displayed on a large screen, or are prone to flicker in the displayed image due to the use of colored fine powder. (It is attracting attention because it causes relatively little visual fatigue.

However, it is not practical because it is insufficient in terms of high contrast, long life, stability with low environmental dependence, and high reliability required for display devices.

[Problem that the invention seeks to solve]

The present invention is based on an image forming method known as the so-called magnetic stylus, which is known from Japanese Patent Publication No. 51-46707, etc., that is, conductive colored fine powder is electrically adsorbed onto a dielectric material using a pin electrode or the like for display. In the method, the aim is to achieve high contrast and excellent recording or display properties.

[Means for solving problems]

In the present invention, an image holding member and a plurality of divided electrodes are arranged so as to face each other in isolation via conductive colored fine powder, and a voltage is applied between the image holding member and the electrodes to form a surface of the image holding member. In a recording or display method in which electrically conductive colored fine powder is attached to a conductive layer, an image holding member is laminated at least on the conductive layer and on the layer. The image holding member comprises a diffuse reflection layer in which fine particles are dispersed in a binding resin, and the reflective layer contains at least conductive fine particles.

The present invention will be explained in detail below.

The recording or display forming means used in the present invention is yI! known from Japanese Patent Publication No. 51-46707. It uses a method called a magnetic stylus. That is, the principle is that, as shown in FIG. 1, a cylindrical magnet 2 is rotated within a non-magnetic cylinder 3, and a colored conductive colored magnetic fine powder 1' moves over the non-magnetic cylinder 3. ! i-conveyed to pass over needle-shaped recording electrodes 4 densely arranged along the axial direction on the non-magnetic cylinder 3. Thus, the image holding member 5 consists of a recording layer (diffuse reflection layer) 6 on the front side and a conductive layer 7 on the back side.
A voltage is applied between the conductive layer 7 and the recording electrode 4 in accordance with the image information, and the conductive colored magnetic fine powder 1f is deposited on the recording medium 5 only in the area where the voltage is applied to form an image. It is also possible to provide a cleaning member in the rounding for removing the displayed image on the image holding member 5. As the cleaning member, it is possible to use pump cleaning, fur cleaning, suction cleaning, magnetic brush cleaning, etc., which are used to remove fine powder. As a cleaning method, a method of electrically removing the charges induced on the recording medium through a cleaning member so as to remove the charges induced on the surface of the recording medium is most effective.

For example, there is a method in which a magnet is placed adjacent to the surface of the recording medium and conductive colored magnetic fine powder used for display is interposed therebetween and grounded.

In such recording or display forming means, the conventional image holding member has a method of: (1) making the light reflecting surface uneven to cause diffuse reflection to increase the contrast; However, this is not desirable because the conductive colored magnetic fine particles are trapped in the recesses, resulting in a decrease in contrast.

(2) Also, a method using an anodic oxide film of aluminum as disclosed in Japanese Patent Publication No. 51-46707. In this method, voltage leaks are likely to occur due to cracks occurring during anodization, the surface becomes uneven and conductive colored fine powder is trapped in the recesses, which tends to reduce contrast, and the whiteness of the anodic oxide film is reduced. It has drawbacks such as low voltage and insufficient contrast, and when the environment changes, a lot of voltage leaks occur, resulting in a decrease in recording or display density and insufficient contrast.

In view of the above, the present invention solves some of the conventional drawbacks by laminating a diffuse reflection layer in which fine particles are dispersed in a binder resin on at least the conductive layer as an image holding member. One of the important features of the present invention is that it is a significant improvement.

In other words, by configuring the diffuse reflection layer with a binding resin as a component, the surface uniformity is improved, and by removing internal cracks, etc., toner capture by the uneven surface is reduced and voltage leakage is prevented. ■ Due to the dispersion of fine particles in the binding resin.

Interfacial reflection due to the difference in refractive index at such an interface significantly increases whiteness and improves contrast.

However, if the specific electrical resistance of the diffuse reflection layer is too high, the electric charge induced in the light diffusion reflection layer during recording will be attenuated, resulting in poor image quality for one recording or display, but if reused, the light After cleaning, the conductive colored powder is adsorbed again due to the residual charge after cleaning to prevent the charge induced in the diffuse reflection layer from remaining. This is a phenomenon called the so-called f-strike.

Since electric charges remain on the entire surface of the image holding member, conductive colored powder is adsorbed on the entire surface, which is called fog, resulting in deterioration of contrast due to a decrease in whiteness.

In order to eliminate such drawbacks, one of the most important features of the present invention is that the electrical resistance of the diffuse reflection layer is adjusted so that charges are less likely to remain, and the charges are removed by natural discharge. have

In order to obtain the desired effect of the present invention, the image characteristics are determined by the specific electrical resistance of the diffuse reflective layer. FIG. 5 shows the ratio of the surface voltage of the diffuse reflection layer generated by the residual charge after 60 seconds to the applied voltage and the recording or display characteristics.

In the recording or display method according to the present invention.

In order to prevent the occurrence of f-strike and a decrease in contrast, the ratio of the surface potential of the diffuse reflection layer generated due to residual charges to the applied voltage must be 1 ts or less.
Based on the present invention, it can be seen that in the recording or display system, the specific electrical resistance is 10 15 Ω·α or less, and preferably 10 Ω·α or less.

In addition, the diffuse reflection layer must be a layer with sufficiently high electrical resistance to function as an image holding member, and must not easily become conductive, or when electrically charged, generates a substantial potential and produces sufficient contrast. It is a layer that functions like this.

Therefore, the state in which it should function as an image holding member,
There are some factors that depend on the conditions of use, but in order to achieve high contrast, which is the gist of the present invention, it is necessary to maintain the initial charging voltage of 501 or more at 100m5@a or more after charging. Specific electrical resistance of ≧1O
It becomes 12Ω・α or more. For the purpose of higher contrast, it is necessary to maintain the initial charging voltage of 901 or more, so it is desirable that the specific electrical resistance of the diffuse reflection layer be 10130·α or more.

In order to impart such specific electrical resistance to the diffuse reflection layer, the present invention is characterized in that conductive fine particles are used as the fine particles constituting the diffuse reflection layer. Examples of the conductive fine particles include conductive metal powder, conductive carbon, and metal oxides.

However, it is difficult to use conductive metal powder when it is made into powder because it is oxidized and forms an oxide film on the surface, resulting in loss of conductivity, poor reflectivity, and whiteness that does not reach the required whiteness of 601 or higher. Alternatively, the conductive car M cannot be used because its whiteness is 0 and contrast cannot be obtained.

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

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

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

For example, fine particles of antimony oxide, antimony oxide and other titanium oxides, metal acids and compounds such as magnesium oxide, silicon oxide, aluminum oxide, barium oxide, or metal sulfates such as barium sulfate, magnesium sulfate, calcium sulfate, or barium carbonate, carbonic acid. Fine particles made of carbonate metal salts such as magnesium and calcium carbonate are preferable. For example, fine particles of indium oxide, metal oxides such as indium oxide and other titanium oxides, magnesium oxide, silicon oxide, aluminum oxide, noglyum oxide, metal sulfates such as barium sulfate, magnesium sulfate, calcium sulfate, or barium carbonate, Fine particles made of carbonate metal salts such as magnesium carbonate and calcium carbonate are desirable.

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

Note that the fine particles are not limited to these.

In such a recording or display forming means, the diffuse reflection layer has a reflection property that forms a reflected light component other than specularly reflected light. The diffuse reflectivity of such a diffuse reflection layer is defined by the ratio of the intensity of the specularly reflected light component to the intensity of the non-specularly reflected light component, and the more the non-specularly reflected light component is, the better the diffuse reflectivity is.

In a display device, it is desirable that the dependence of contrast on the viewing angle is small, so it is necessary to increase the non-specularly reflected light component. In other words, a material with excellent diffuse reflection properties is desired. There are several methods for defining diffuse reflectance, but in the present invention, from the viewpoint of simplicity and practicality, it is defined as whiteness based on the reflection density obtained with a Macbeth densitometer or a similar functional product based on the following.

Whiteness-((1,44-reflection density)/(1,44+0.
04)) X100 Whiteness 100: Reflection density ≦0.04 (Almost everyone expressed it as pure white in the panel test) Whiteness O: Reflection density ≧1.44 (Almost everyone expressed it as black in the /4' panel test, and the contrast was Based on this definition of whiteness, the contrast of recording or display can be expressed as the difference between the whiteness of the image holding member and the whiteness of the recording or display section. Therefore, a decrease in the whiteness of the image holding member inevitably leads to a decrease in contrast, which results in insufficient recording or display.

Conventionally, in such recording or display methods, the whiteness was insufficient and the contrast could not reach the required level, but in the present invention, at least a diffuse reflection layer in which fine particles are dispersed in a binding resin is laminated on the conductive layer. Brightness is 6
It became possible to achieve a coefficient of 0 or higher and obtain sufficient contrast.

In the recording or display method based on the present invention, the display characteristics are proportional to the amount of charge generated in the diffuse reflection layer, and therefore are somewhat related to the degree of coloring of the conductive colored magnetic fine powder forming one display. Specifically, if the voltage applied when forming the film thickness of the charged layer is V, then in order to obtain sufficient contrast, ■≧15 (v/#ff1) X t (μm). In order to obtain further contrast, V≧20 (V/μm
)xt(μm) is desirable.

Considering the matching between the voltage applied during recording or display and the drive circuit, it is relatively easy to output a voltage of about 100 V or less, so considering the applied voltage of 100 V or less, the thickness of the charged layer should be 7 μm or less, preferably 5 μm. The following are practical.

Even if an intermediate layer was provided to prevent the conductive layer and the diffuse reflection layer from peeling off and to improve adhesion, the effects of the present invention were not reduced.

In addition, thermoplastic resins such as polyester, acrylic resin, polyolefin, polyacetal,
I-lyamide, polystyrene, halogen-containing resin, silicone resin, 4-lyether, polycarbonate, vinyl acetate resin, polystyrene resin, cellulose resin and various copolymers thereof, or thermosetting resin such as phenol resin, xylene resin , petroleum resins, area resins, melamine resins, unsaturated polyesters, aluminized resins, epoxy resins, silicone resins, furan resins, etc. alone, copolymers, or mixtures are used.

Further, the conductive layer is a layer having a sufficiently low electrical resistance and is easily in a conductive state, or a layer that functions so as not to generate a substantial potential when electrically charged. Therefore, although there are some factors that depend on the state in which the conductive layer should function and the conditions of use, if we aim for high contrast, which is the gist of the present invention, the residual potential of the conductive layer will cause a decrease in contrast. , after charging 1
If it is attenuated to 1/loo or less of the initial charging potential at 00 m5 ec or less, it can be said that there is a sufficient conduction state, so that the specific electrical resistance of the conductive layer is ≦100.

For faster image display, 1nsll after charging!
Since it is required that the initial charging potential is attenuated to 17100 or less at temperatures below +C, the specific electrical resistance of the conductive layer is ≦10.
0. Confucianism is desirable.

The materials that form the conductor layer include aluminum, iron, gold, and S.
The conductive substance is powdered in conductive metals such as n, Zn, carbon, conductive inorganic compounds such as tin oxide, indium oxide, antemo y, etc., or in binding resins such as polymers. These include those that are separated and dispersed.

In particular, in order to increase contrast in recording or display, a conductive layer having low light absorption and excellent light reflection is desirable.

Although the conditions do not limit the present invention, the electrically conductive colored powder is mainly composed of a binder, electrically conductive powder, a magnetic material, and, if necessary, various dyes and pigments as a coloring agent.

As a binder, thermoplastic resins include polyester, acrylic resin, polyolefin, polyacetal, etc.
Thermosetting resins, if necessary, such as lyamide, styrene, halogen-containing resins, silicone resins, polyethers, polycarbonates, vinyl acetate resins, polystyrene, cellulose resins, epoxy resins, and various copolymers thereof. As a single substance, copolymer, or mixture of phenol resin, xylene resin, petroleum resin, area resin, melamine resin, unsaturated polyester, alkyd resin, epoxy resin, silicone resin, furan resin, etc., 15 to 60 V
Use t section.

Conductive powders include conductive carbon, fine powders of various conductive metals, zinc oxide, tin oxide, indium oxide,
2 to 3 conductive metal oxide powders such as antimony oxide
0 wt% is used.

In addition, as a magnetic material, magnetic powder such as F.2.04 is used at 20~
80'A vt% is used. If necessary, use 15 to 20 feet of dyes/pigments such as various types of talocyan, malachite green, etc. as coloring agents.

These components are heated to about 100 to 300°C, mixed uniformly, and then cooled and ground into fine powder. If necessary, classify the powder to a desired particle size and use it as a conductive colored powder. The average particle size is 5 to 20 μm, and the specific electrical resistance is at an applied voltage of 10 μm in a container that does not contain conductive colored powder.
At 0V or less, it was 103[l-α to 10Ω·bo.

In addition, the gross conditions for the recording or display method are 500 to 20 magnetic poles per rotation, with a configuration of 6 to 50 poles.
00 Gauss intensity at 300 to 7000 r.
It was used by rotating at about pm.

The non-magnetic cylinder is a molded product made of a non-magnetic metal such as aluminum or stainless steel, or a single substance such as plastic or each rice inorganic oxide, or a composite of Fi. The non-magnetic cylinder may be used in a rotating or non-rotating state.

As the recording electrode, an electrode width of 0.1-1 mm, an inter-electrode width of 0.1 to 1 fi, and an applied voltage of 1 ov to 1 oov were used. Further, the moving speed of the recording medium was set at 50 to 700 f/sec, and the distance to the electrode was set at 50 to 500 μm.

Incidentally, FIG. 4 shows the structure of the image holding body 5. Figure 4 (4-1
) has a two-layer structure of conductive NI7 and recording layer 6 (diffuse reflection layer),
FIG. 4 (4-2) shows the support 30. Conductive layer 7, recording layer 6 (
This is an example of a three-layer structure of the diffuse reflection layer.

Further, based on the present invention (see Fig. 2), a recording/display device to which the 14iJQ present system display method is applied is specifically described. 5 may be a non-endless belt-like recording medium. A pair of sailors 11.1 are arranged vertically opposite each other.
1', and the recording medium 5 is movably supported in a plane in the display section 18 by a back plate 16 and rollers 1t and xf. This recording medium 5 is driven in the direction of the arrow during image formation. At the lowest position of the circulation path of the recording medium 5, that is, at the position facing the roller 1, conductive colored magnetic fine powder l as a display substance is attached to the recording medium 5 according to the display information, and the display is displayed. Means 17 are provided for forming. Reference numeral 9 in the figure is a container for storing the conductive colored magnetic fine powder 1.

Information obtained from the document reading device 15 based on the display forming means described above is applied as an electrical signal to the recording electrode 4 by the recording control section 13 via the storage device 14t.

By adding a writing display function, a reading function, and a grid/write function to this display device, a device as shown in FIG. 3 can be realized.

Image information to be displayed is input from the document reading device 15 and is electrically transmitted to the recording electrode 4 by the recording control unit 13 from the encoding/decoding circuit unit 28 via the encoding/decoding circuit unit 28 and the storage device 14t or directly. Applied as a signal.

Further, on the outer circumferential side of the recording medium 1, a writing medium 20 is arranged, which is formed in the shape of an endless belt and is transparent and capable of writing and erasing using felt-in or the like.
are rollers 19 and 19'.

19" so that it can be circulated. Also, this writing medium 20 is placed between rollers 19 and 19 in the 1 display section 18.
'It is supported on a flat surface.

Also, the image on the recording medium 5 and υ are located near the roller 11.
A cleaning member is provided for removing the electroconductive colored magnetic fine powder adhering to the back surface of the writing medium 20.

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

Further, on the back side of the recording medium 5, a means 22 for reading images on the recording medium 5 and the writing medium 20 is provided. That is, at the reading position that is the closest position between the recording medium 5 and the writing medium 20, there is a rung 24 with a reflective shade 23 that illuminates the images on both the media 5 and 20, and a light image reflected from both the media 5 and 20. A mirror 27 is provided to make the light incident on the photoelectric conversion element 26 via the lens 25. The images on the recording medium 5 and the writing medium 20 are read by the photoelectric conversion element 26 and recorded in the glinter 29 directly via the encoding/decoding circuit section 28 or via the storage device 14.

These specific examples are merely embodiments of the present invention, and the present invention is not limited to these embodiments.

〔Example〕

The present invention will be further explained below with reference to Examples.

Example-1 30 parts by weight of a polyester resin which is a condensation polymer of terephthalic acid and ethylene glycol, 30 parts by weight of titanium oxide powder with an average particle size of 0.5 μm, and 30 parts by weight of tin oxide powder with an average particle size of 0.5 μm were added to 2QO. The melted and dispersed product in step C was extruded into a film through a T-shaped die and thermally laminated on one side of an aluminum foil with a thickness of 50 μm to form a white film with a thickness of 5A, which was used as an image holding member.

Based on the same procedure as in Example-1, the following composition ratios were used as Examples and Comparative Examples.

Polyester Titanium oxide Tin oxide resin powder
Powder comparative example-13o, tts 6oz-#C part 02.
ikm Example-2304020 Example-3302040 Example-430060 Example-5 30 15 15 Comparative Example-
2 50μm thick aluminum foil with oxalic acid concentration 7
The image holding member was immersed in an aqueous solution of VT (temperature 300), applied with a voltage of 50V (current density IA/dm2) for t-20 minutes, and then anodized to form an alumite layer with a thickness of 10#s. And so.

〔result〕

Compare the display functions of the ratio display device shown in Figure 2.

The conductive colored powder used was composed of 30 parts of Bis7-Nal A type epoxy resin, 10 parts of conductive carpin, and 60 parts of Fe 504 powder, and had an average particle size of 10μ and a specific electrical resistance of 10Ω.
- α (100V applied).

In addition, the rotating magnetic pole has a 16-pole configuration of 900 gakum and an outer diameter of 36φ.
It was used at a rotation speed of 2200 rpm in the opposite direction to the moving direction of the full image holding member.

The non-magnetic cylinder has a wall thickness of 1n and an outer diameter of 4oφ, and has an electric conductor with a width of 0.5mm at a position facing the image holding member, and “J: width between poles of 0.
．． All etched stains were placed at 25m intervals 2
A polyimide film with a thickness of 0.00 μm was adhered to the outer surface of the non-magnetic cylinder. The voltage applied to the electrodes was 40V. Under these conditions, the image holding member was transported at a speed of 220 g/s@e.

The results are shown in the table below.

Specific electrical resistance of diffuse reflection layer Surface roughness whiteness (initial) Example-1832X10 Ωtsu 0.7 Example-2
84 5X10 0.7 Example-
3 80 10” 0.7 Example-4 75 10120.7 Comparative example-1
85 10140.7 Comparative Example-2
40 10' 4.0 Example-5
828 mowing 0” 0.683 (83,0
) 68 (68,0) 1584
(84,0) 69 (69,0
) 1580 (80,0) 6
5 (65,0) 1575 (75
,0) 60 (60,0) 15
85 (85,0) 59 (59
,0) 2620 (35,10)
10 (25,15) 1082
(82,0) 79 (79,0)
3*Repeat 9 times 10,000 times Example-6 Aluminum was deposited on a 100μ thick polyester surface to a film thickness of 8001, and a paint having the following composition was applied on the aluminum to a film thickness of 4 μm.The image holding member was used as an average. Particle size 1.0
15 parts of barium sulfate powder of μm, 15 parts of tin oxide powder of average particle size of 0.5 μm, 30 parts of thermosetting phenolic resin, 810 parts of total methyl ethyl ketone, and 10 parts of gel mill.
After time dispersion, a mixture having a dispersed average particle size of 0.8 μm was applied using a reverse roll coater and heated at 140° C. for 5 minutes.

Example 7 In Example 2, calcium carbonate having an average particle size of 0.8 μm was used as a base for barium sulfate.

〔result〕

Example-6 Example-7 Whiteness of image holding member 〉0 80 Specific electrical resistance 5X 10 Ω・α 5
X 10” Surface roughness 1.3μm
1.0μm contrast (initial) >OS
O Non-display whiteness chromaticity 〉0 80 Display area whiteness 00 Contrast after repetition 67
77 Non-display area whiteness 67 77 Display area whiteness 00 Change in contrast 33 As seen in the above examples, when the present invention is applied, excellent contrast can be obtained.

Example 8 200 parts by weight of 30 parts by weight of a polyester resin which is a condensation polymer of terephthalic acid and ethylene glycol, 30 parts by weight of titanium oxide powder with an average particle size of 0.5 μm, and 30 parts by weight of zinc oxide powder with an average particle size of 0.5 μm. The material melted and dispersed at ℃ is T
A white film having a thickness of 5 μm was prepared by extruding it into a film from a mold die and thermally laminating it on one side of an aluminum fin file having a thickness of 5011 nm to form an image holding member.

Based on the same procedure as in Example-1, the following composition ratios were used as Examples and Comparative Examples.

Polyester Titanium oxide Zinc oxide resin Powder Powder Example-9304020 Example-10302040 Example-1130060 Example-12 30 15 15
[Results] The display functions of the display devices illustrated in FIG. 2 were compared.

The conductive colored powder used was composed of 30 parts of Pisphenol A type epoxy resin, 710 parts of conductive carton, and 60 parts of F@sO4 powder, and had an average particle size of 10μ and a specific electrical resistance of 1OΩ・
clIL (lOOOO applied).

The rotating magnetic poles are 16 poles and 900 Gaum.

One having an outer diameter of 36φ was used at a rotation speed of 220 rpm in the opposite direction to the moving direction of the image holding member.

The non-magnetic cylinder has a wall thickness of 1fl and an outer diameter of 40φ, and has an electrode width of 0.5m at a position facing the image holding body! Width between electrodes 0.2
200 electrodes were provided by etching at intervals of 5 m.
A μ-thick polyimide film was adhered to the outer surface of the non-magnetic cylinder. The voltage applied to the electrodes was 40V. Under these conditions, the image holding member was transported at a speed of t-220 m/@@e.

The results are shown in the table below.

Specific electrical resistance of diffuse reflection layer Surface roughness whiteness (initial) Example-8832X1013Ω10.7 Example-9
84 5 mowing 0” 0.7 Example-10
83 IO” 0.7 Example-1
1 78 10120.7 Comparative example-1
85 10” 0.7 Comparative example-2
25 10' 4.0 Example - H838 The paint with the following composition has a film thickness of 4 μm and the average particle diameter is 1.0 when the image holding member is used.
15 parts of Paricum sulfate powder of μm, 15 parts of zinc oxide powder of average particle size of 0.5 μm, and 30 parts of thermosetting phenol resin were mixed in a gall mill with 810 parts of methyl ethyl ketone.
After dispersing for 0 hours, the average particle diameter per dispersion was 0.8 μmf)v4 mixture was applied using a reverse roll coater and heated at 140° C. for 5 minutes.

Example 14 In Example 2, calcium carbonate having an average particle size of 0.8 μm was used as a base for barium sulfate.

〔result〕

Example-13 Example-14 Whiteness of image holding member 68 78 Specific electrical resistance 5X10 Q・cm 5X
10” surface roughness 1.3μm
LOAm contrast (initial) 68
78 Non-display area whiteness 68
78 Display whiteness 00 Contrast after repetition 65
75 Non-display area whiteness 65 75 Display area whiteness OO Change in contrast 33 As seen in the above examples, based on the present invention,
Provides excellent contrast.

Example 15 200 parts by weight of titanium oxide powder with an average particle size of 0.5 μm and 30 parts by weight of indium oxide powder with an average particle size of 0.5 μm were added to 30 parts by weight of a polyester resin which is a condensation polymer of terephthalic acid and ethylene glycol. The product was melted and dispersed at 0.degree. C., extruded into a film through a T-T die, and thermally laminated on one side of a 50 .mu.m thick aluminum foil to form a 5 .mu.m thick white film to serve as an image holding member.

Based on the same procedure as in Example-1, the following composition ratios were used as Examples and Comparative Examples.

Polyester Titanium oxide I/dium oxide resin Powder Powder example-16304020 Example-17302040 Example-1830060 Example-19 30 15
15 [Results] The display functions of the display devices illustrated in FIG. 2 were compared.

The conductive colored powder used was composed of 30 parts of Pisphenol A type epoxy resin, 10 parts of conductive Cardef, and 60 parts of R-304 powder, and had an average particle size of 10μ and a specific electrical resistance of 10Ω.
m (10 ov applied).

In addition, the rotating magnetic pole has a 16-pole configuration, 900 Gaum, and an outer diameter of 36
φ was used at a rotational speed of 2200rl)ffl in the opposite direction to the moving direction of the image holding member.

The non-magnetic cylinder has a wall thickness of 1fi and an outer diameter of 40φ, and has an electrode width of 0.5fl and an inter-electrode width of 0.5fl at a position facing the image holding member.
Electrodes were adhered to the outer surface of the non-magnetic cylinder using a polyimide film 200 μm thick by etching at intervals of 25 tm. The voltage applied to the electrodes was 40V. Under these conditions, the image holding member was transported at a speed of 220 gears/sec.

The results are shown in the table below.

Specific electrical resistance of diffuse reflection layer Surface roughness whiteness (initial) Example-15832X1015Ω・cILo, 7 Example-16 84 5 cut o1g 0.7 Example-17 82 10" 0.7
Example-18 77 10120.7 Comparative Example-1 85 10" Q, 7 Comparative Example-2 20 10' 4.0 Example-19838 Mowing o1! O4*Repetition is 1
0000 times Example-20 Aluminum was vapor deposited to a film thickness of 800X on a 100μ thick polyester surface, and a coating with the following composition was applied on the aluminum to a film thickness of 4 μm to form an image holding member with an average particle diameter of 1.0
15 parts of barium sulfate powder of μm, 15 parts of indium oxide powder of average particle size of 0.5 μm, and 3 parts of thermosetting phenolic resin.
0 part was dispersed with 810 parts of methyl ethyl ketone in a sol mill for 10 hours, and a mixture having a dispersed average particle size of 0.8 μm was coated with a reverse roll coater and heated at 140° C. for 5 minutes.

Example 21 In Example 2, calcium carbonate having an average particle diameter of 0.8 μm was used instead of barium sulfate.

〔result〕

Example-20 Example-21 Whiteness of image holding member 67 77 Specific electrical resistance 5×1012Ω-cIIL5×10
15 Surface roughness 1.3μm 1
．． 0μm contrast (initial) 67
77 Non-display area whiteness 67
77 Display whiteness OO Contrast after repeated display 64 7
4 Whiteness of non-display area 64 74 Whiteness of display area 00 Change in contrast As seen in the 33 and above examples, when the present invention is applied, excellent contrast can be obtained.

Example 22 30 parts by weight of a polyester resin which is a condensation polymer of terephthalic acid and ethylene glycol, 30 parts by weight of titanium oxide powder with an average particle size of 0.5 μm, and 30 parts by weight of antimony oxide powder with an average particle size of 0.5 μm t- Melt and disperse at 200°C 1&: Extrude into a film from a T-shaped die to a thickness of 50 μm
A white film having a thickness of 5 μm and heat-laminated on one side of a thick aluminum foil was used as an image holding member.

Based on the same procedure as in Example-1, the following composition ratios were used as Examples and Comparative Examples.

Polyester Titanium oxide Antimony oxide resin Powder Powder Example-23304020 Example-24302040 Example-2530060 Example-26 30 15 1
5 [Results] The display functions of the display devices illustrated in Figure 2 were compared.

The conductive colored powder used was composed of 30 parts of bisphenal A type edexy resin, 10 parts of conductive carmen, and 60 parts of F11504 powder, and had an average particle size of lOμ and a specific electrical resistance of 10'.
It was Ω·cIFL (100V applied).

In addition, the rotating magnetic pole has a 16-pole configuration, 900 Gaum, and an outer diameter of 36
φ was used at a rotation speed of 220 Qrpm in the opposite direction to the moving direction of the image holding member.

The non-magnetic cylinder has a wall thickness of 11 mm and an outer diameter of 40 φ, and stain poles are provided by etching at a position facing the image holding body at intervals of an electric standard width of 0.5 tar and an interelectrode width of 0.25 m. A 200μ thick I-limide film was adhered to the outer surface of the non-magnetic cylinder. The voltage applied to the electrodes was 40V. Under these conditions, the image holding member was transported at a speed of 220 w/ssa.

The results are shown in the table below.

Specific electrical resistance of diffuse reflection layer Surface Arab whiteness (initial) Example-22832X10 Ω-vx O, 7 actual example-23 84 5X101s0.7 example-24 81 10" 0.7 example-25 76 10120. 7 Comparative example-1 85 10" 0.7 Comparative example-2 40 10' 4.0
Example-26838 mowing 0150.6 ko; (Bottle *Repetition is 1000 times Example-27 Aluminum is vapor-deposited to a film thickness of 800X on the surface of 100μ thick polyester, and a paint with the following composition is applied on the aluminum. When the film thickness is 4 μm, the average particle diameter of the image holding member is 1.0.
15 parts of barium sulfate powder of μm, 15 parts of antimony oxide powder of average particle size of 0.5 μm, and 3 parts of thermosetting phenolic resin.
0 part was dispersed with 810 parts of methyl ethyl ketone in a Gehr mill for 10 hours to obtain a preparation solution with a dispersed average particle diameter of 0.8 μm.
It was coated using a 17 Perth roll coater and heated at 140°C for 5 minutes.

Example 28 In Example 2, calcium carbonate having an average particle diameter of 0.8 μm was used instead of barium sulfate.

〔result〕

Example-27 Example-28 Whiteness of image holding member 69 79 Specific electrical resistance 5×10 Ω・crrL5×1013
Surface Arab 1.3μm 1.0μ
m contrast (initial) 69
79 Non-display area whiteness 69 7
9 Display whiteness OO Contrast after repeated display 66
76 Non-display area whiteness 66 76 Display area whiteness 00 Change in contrast 33 As seen in the above examples, when the present invention is applied, excellent contrast can be obtained.

〔Effect of the invention〕

The present invention has the above-described structure and operation, and includes an image holding member and a plurality of divided electrodes arranged so as to be isolated and facing each other through conductive colored fine particles, and the image holding member and the electrodes In a recording or display method in which electrically conductive colored fine powder is adhered to the surface of an image holding member by applying a voltage between them, the image holding member has fine particles dispersed in a binder resin on at least a conductive layer. By laminating a diffuse reflection layer containing at least conductive fine particles in the diffuse reflection layer, it was possible to achieve high contrast and excellent recording or display characteristics in recording or display.

[Brief explanation of the drawing]

FIG. 1 is a schematic cross-sectional view showing a magnetic stylus type image forming means and an image holding member having a diffuse reflection layer of the present invention. FIG. 2 shows one embodiment of the recording or display method using the image holding member of the present invention, and FIG. 3 similarly shows one of the other embodiments. FIG. 4 is a schematic cross-sectional view showing the structure of the image holding member of the present invention. FIG. 5 is a graph showing the relationship between the specific electrical resistance of the diffuse reflection layer of the present invention and the ratio of surface potential to applied voltage after repeated use. 1... Conductive colored magnetic fine powder, 2... Rotating magnet, 3
...Nonmagnetic cylinder, 4...Acicular recording electrode, 5...Image holding member, 6...Recording layer (diffuse reflection layer), 7...Electroconductive support, 8... Transparent plate, 9... Conductive colored magnetic fine powder storage container, 10... Device framework, 11, tr.
... Sheet support member, 12 ... Cleaning member, 1
3... Recording control unit, 14... Storage device, 15...
Original reading device, 16... Back plate, 17... Image forming means, 18... Display section, 19.19'... Roller, 2
0...Writing medium, 21...Erasing member, 22...Image reading means, 23...Reflective shade, 24...Rung, 2
5... Lens, 26... Photoelectric conversion element, 27...
Mirror, 28... Encoding/decoding circuit unit, 29... Printer, 30... Support body. Figure 3

Claims (1)

[Claims] 1. An image holding member and a plurality of divided electrodes are arranged so as to face each other in isolation through conductive colored fine powder, and a voltage is applied between the image holding member and the electrodes. In a recording or display method in which electrically conductive colored fine powder is attached to the surface of an image holding member, the image holding member is formed by dispersing fine particles in at least a conductive layer and a binding resin laminated on the layer. An image holding member comprising a reflective layer and containing at least conductive fine particles in the reflective layer. 2. The image holding member according to claim 1, wherein the conductive fine particles contain at least tin oxide. 3. The image holding member according to claim 1, wherein the conductive fine particles contain at least zinc oxide. 4. The image holding member according to claim 1, wherein the conductive fine particles contain at least antimony oxide. 5. The image holding member according to claim 1, wherein the conductive fine particles contain at least indium oxide. 6. The image holding member according to claim 1, wherein the image holding member has a whiteness of 60% or more. 7. The image holding body according to claim 1, wherein the diffuse reflection layer constituting the image holding body has a specific electrical resistance of 10^1^2 Ω·cm or more.