JP2006234910A - Detachable label using reversible information display panel - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a detachable label using a reversible information display panel, with which its fabricating cost and man-hours required for its fabrication are suppressed down to a sufficiently low level and the consumption of resources is efficiently suppressed. <P>SOLUTION: The freely attachable and detachable label 1 has a display portion constructed with the reversible information display panel which makes required information displayed on the transparent substrate side by sealing a display medium in an enclosed space between two sheets of substrates which are placed opposite to each other and of which at least one is transparent, and transferring the display medium with an electric field produced by charges formed on the substrate surface, wherein the reversible information display panel uses two kinds of display mediums respectively constructed with two kinds of particles for the display mediums with mutually different colors and charge characteristics and both with average particle diameters in 3-10 μm range, and total thickness of the information display panel is set to be 10 μm or more and less than 1 mm. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention is a detachable label that can be used as a display label for a cassette tape or the like, having a display unit composed of a reversible and dry information display panel, and can be rewritten and used repeatedly. The present invention relates to a detachable label using an information display panel.

  Conventional general detachable labels that can be used as display labels for cassette tapes, floppy (registered trademark) disks, and the like are produced as printed matter on paper or the like.

  However, in the conventional general removable label, there is a problem that it is necessary to perform predetermined printing on predetermined paper, which increases the production cost and man-hours of the removable label. There was also a problem of resource saving that part was forced to be discarded.

  On the other hand, as an information display panel capable of repeatedly displaying information such as images, the present applicant encloses a display medium in a space between two substrates, at least one of which is transparent. A reversible information display panel that can be moved in an electric field to display required information on the transparent substrate side has been proposed (see, for example, Patent Document 1). This information display panel moves the display medium based on the formation of electric charges such as an electrostatic latent image on the substrate, the Coulomb force between the particles for the display medium constituting the display medium, the electric image force with the electrode, the molecule Even if there is no electric field between the substrates due to interatomic force, liquid bridging force, gravity, etc., the display information can be maintained over a long period of time, so that it has the advantage of exhibiting excellent display storability. Therefore, after displaying required information such as graphics, symbols, images, etc. on the transparent substrate for a long period of time, it can be easily erased and rewritten, and can be used repeatedly, so it can be suitably used for the above-mentioned removable label There is sex.

JP 2004-341123 A

  However, if the conventional information display panel is used as a detachable label, there is a problem that clear information display may not be possible, or display information may not be erased and rewritten securely. It could not be used for the removable label which is the subject of the present invention.

  An object of the present invention is to detachably use a reversible information display panel which can solve the above-mentioned problems, can keep the production cost and man-hour of a detachable label sufficiently low, and can effectively suppress resource consumption. Try to provide a label.

  The removable label using the reversible information display panel of the present invention encloses a display medium in a sealed space between two substrates facing each other and at least one of which is transparent, and the display medium is placed on the substrate surface. A detachable label having a display unit composed of a reversible and dry information display panel that is moved by an electric field created by the formed charge and displays necessary information on the transparent substrate side, and has color and charging characteristics. Differently, two types of display media each composed of two types of particles for display media having an average particle diameter in the range of 3 to 10 μm are used, and the total thickness of the information display panel is set to 10 μm or more and less than 1 mm. It is characterized by that.

  As a suitable example of the detachable label using the reversible information display panel of the present invention, the display medium sealed in the sealed space between the substrates is mainly composed of insulating particles and does not include magnetic particles. The thickness of at least one of the two substrates is 0.4 mm or less, and the distance between the substrates formed by the two substrates facing each other is 0.1 mm or less, and each substrate is made of a plastic material. A plurality of information display areas in the removable label, and the combination of two types of display media to be combined for each information display area can be changed, and the display medium can be used as a display medium. A powder fluid composed of particles composed of particles or particles for a display medium may be used.

  In the detachable label using the reversible information display panel according to the present invention, first, the clear information display that the conventional information display panel has cannot be displayed, or the display information cannot be erased and rewritten reliably. There are cases where the color and charging characteristics are different, and two types of display media each composed of two types of display media particles having an average particle diameter in the range of 3 to 10 μm are used. This is solved by setting the total thickness of the display panel to 10 μm or more and less than 1 mm. Thus, display information can be rewritten reliably by using charge forming means that can form charges on the information display panel substrate (for example, means for forming charges as an electrostatic latent image by a photoconductor or means for forming charges by ion flow). Can be done. For this reason, in the removable label using the reversible information display panel having the above-described configuration, once the displayed information is securely erased, new information can be displayed any number of times. And the like, and the cost and work man-hours for that can be greatly reduced, and the consumption of resources can be sufficiently prevented.

  In the removable label using the reversible information display panel according to the present invention, two types of information display areas formed in the removable label are different in color and charging characteristics sealed between the substrates. By changing the combination of display media, for example, when used as a display label of a floppy disk, the display color and background color of the information display area for displaying recorded content information and the information display area for displaying date information can be changed. By making it different, it is possible to perform easy-to-see label display.

  By the way, in the information display panel used for the removable label of the present invention, making each substrate made of a plastic material not only makes the panel sufficiently thin and light, but also allows the removable display of the present invention. This is also an effective method for surely erasing the label information displayed on the label for a predetermined period and then displaying new label information clearly.

Hereinafter, the best mode for carrying out the present invention will be described in detail with reference to the drawings.
1 (a), 1 (b) and 2 (a), 2 (b) are diagrams showing an embodiment of a detachable label according to the present invention, wherein 1 is a detachable label according to the present invention. . FIG. 1 (a) shows a removable label 1 displaying predetermined information, and FIG. 1 (b) shows a state where the removable label 1 displaying predetermined information is attached to a floppy disk which is an object to be used. Show. FIG. 2A shows the removable label 1 in which the predetermined information is rewritten with other information, and FIG. 2B shows that the removable label 1 after being rewritten is attached to a floppy disk that is an object to be used. Indicates the state. The detachable label 1 of the present invention is configured as a rectangular label made of a reversible information display panel, which will be described later, and an object to be used is provided by providing an adhesive layer made of, for example, a slightly adhesive adhesive on the back surface thereof. It is configured to be detachable from (cassette tape, floppy disk, etc.).

In the example shown in FIGS. 1A and 1B, the removable label 1 for a floppy disk displays an information display area 1a for displaying information in two colors of blue / white, and displays information in two colors of black / white. And an information display area 1b. In the example of the information display area 1a, the information display area 1a is composed of fixed information “recording contents” in the first column and variable information “XX data” in the second column. "02.11". Note that the “recording content” that is fixed information in the information display area 1a does not need to be changed, and can be printed in advance with a required color. Further, both the information display areas 1a and 1b may be displayed with only black / white two colors, for example.
In the example shown in FIGS. 2A and 2B, in the removable label 1 for the floppy disk, the variable information “◯ XX data” in the second column of the information display area 1a is not rewritten. When the recorded content is changed, it can be rewritten as “□ Δ □ Δ data”. On the other hand, the date information that is variable information in the information display area 1b of the removable label 1 for floppy disk is rewritten as "2005.03.03". The contents of the variable information in the information display areas 1a and 1b are not limited as long as the information can be displayed.
Since the cross section of the detachable label 1 of the present invention is as shown in the schematic view of FIG. 2C, the AA cross section of FIG. 2B is schematically shown in FIG. As shown.

By the way, in FIG. 1 (a), (b) and FIG. 2 (a), (b), the information display area | region 1a and the information display area | region 1b which are several information display area | regions formed in the detachable label 1 are shown. In each case, the combination of two types of display media having different colors and charging characteristics enclosed between the substrates (that is, the combination of display colors) is a combination of white and blue and white and black. By freely combining the display colors of the area 1a and the information display area 1b, label display that is easy to see can be performed.
In addition, the display medium to be sealed between the substrates is composed of particles or powder fluid that is mainly composed of insulating particles and does not contain magnetic particles, so that the object to be used contains a magnetic material such as a floppy disk. In some cases, it can be suitably used.

  Hereinafter, a reversible and dry information display panel used for the above-described removable label will be described.

  FIGS. 3A to 3C are diagrams showing an example of the structure of the reversible information display panel used in the present invention. The reversible information display panel shown in FIG. 3A has different charging characteristics, for example, in a sealed space in which air is contained between two substrates 11 and 12 that are parallel to each other. Two types of display media 13W and 13B composed of two colors of black and white display medium particles (here, white display media 13W composed of particles composed of particles for white display media and particles composed of particles for black display media) A black and white display medium 13 consisting of a group is enclosed to form a black and white two-color combination display medium 13. In the example shown in FIG. 3B, in addition to the example shown in FIG. 3A, a partition 14 is provided between the substrates 11 and 12 in a lattice shape to form cells. Moreover, in FIG.3 (b), the partition in front is abbreviate | omitted. Further, in the example shown in FIG. 3C, the above-described display medium is enclosed in a transparent capsule 17, and a plurality of capsules 17 (monochrome two-color combination display medium 13) are provided on the substrate 11, without providing a partition. The reversible information display panel is arranged between the two.

  FIGS. 4A to 4C are diagrams showing other examples of the structure of the reversible information display panel of the present invention. The reversible information display panel shown in FIGS. 4A to 4C has a conductive member 15 on the inner surface side of each of the substrates 11 and 12, in addition to those described with reference to FIGS. 16 and at least the conductive member 16 on the transparent substrate 11 side is a transparent conductive member.

  Such a reversible information display panel applies an electric field to the display medium 13 which is a combination of two types of display medium 13W and display medium 13B each composed of particles for display medium having different colors and charging characteristics. A display medium charged at a low potential (for example, 13 W) is attracted toward a high potential electric field direction by Coulomb force or the like, while a display medium charged at a high potential (for example, 13 B) is attracted toward a low potential electric field direction. As a result, the moving direction of these display media is switched in accordance with the change of the electric field direction, and necessary information can be displayed on the transparent substrate 11 side.

  Therefore, as shown in FIGS. 3A to 3C and FIGS. 4A to 4C, the white display medium 13W and the black display medium particles each composed of a group of particles composed of the white display medium particles are used. In accordance with the electric field formed by the electric charge such as an electrostatic latent image applied to the outside of the substrates 11 and 12, the display medium 13 composed of the two-color display medium and the black display medium 13 </ b> B composed of the configured particle group is used. The display is displayed on the transparent substrate 11 by moving the display medium vertically between the two substrates and making the observer visually recognize the white display medium 13W or the black display medium 13B with the size of the display medium particles as a pixel unit. It can be carried out.

  In addition, in the reversible information display panel as shown in FIGS. 3A to 3C and FIGS. 4A to 4C, a white display medium 13W composed of particles composed of particles for white display medium is provided. The white display medium 13W composed of powder fluid composed of particles for white display medium and the black display medium 13B composed of particles composed of particles for black display medium from the powder fluid composed of particles for black display medium. The black display medium 13B can be replaced. Further, the combination of colors of the two-color display medium of the reversible information display panel can be any combination of various realizable colors as well as white and black as described above. .

  The reversible information display panel as described above encloses the display medium 13 in a sealed space between two opposing substrates 11 and 12 that are at least one transparent, and applies an electric field to the display medium to move it. A reversible display panel for displaying information. Here, a particle group or a powder fluid is used as the display medium 13, and the display medium 13 is visually recognized through the transparent substrate 11, so that a large contrast such as black and white is obtained. A wide viewing angle can be secured. Further, the information (display contents) is rewritten, that is, the electric field is applied only when the display media 13W and 13B are moved. After the movement, the display media 13W and 13B remain in the position where they have moved once without the effect of the electric field. Therefore, display information can be held for a long time. On the other hand, when information is to be rewritten, the display medium 13W, 13B is moved again to display other information by applying the electric field again, so that the information can be rewritten reversibly.

  Here, since the display medium particles directly display information, the size of the particles constituting the display media 13W and 13B determines the clearness of the information. Therefore, here, preferably, a display medium is composed of particles composed of particles for a display medium composed of particles having an average particle diameter of 3 to 10 μm, or the display medium is adjusted so that the particles for a display medium become a powder fluid. By doing so, the display of clear information is ensured and the display of delicate and precise information is enabled.

  Next, an example of information display, information rewriting, and information erasing in the reversible information display panel used in the present invention having the above-described configuration will be described.

  FIG. 5 is a diagram for explaining an example of information display on the reversible information display panel used in the present invention. In the reversible information display panel used in the present invention, as shown in an example in FIG. 5, some charge is applied to the external surface on the transparent substrate 11 side of the reversible information display panel in which the display medium 13 is sealed between the opposing substrates 11 and 12. When an electric charge is applied by the forming means 21, an electrostatic field is formed. In accordance with the electrostatic field, the negatively charged display medium is attracted by the Coulomb force toward the positively charged substrate part, and is charged positively toward the negatively charged substrate part. The display medium is attracted by Coulomb force or the like, and the display medium is attracted to the inner surface of the transparent substrate 11 and electrostatically attached, whereby information such as an image is displayed.

  This electrostatic latent image is formed by transferring an electrostatic latent image formed by an ordinary electrophotographic system using an electrophotographic photosensitive member onto the reversible information display panel of the present invention, or by ion flow. It can also be performed by a method such as directly forming an electrostatic latent image. As shown in FIG. 5, the display medium attracted to the inner surface of the transparent substrate 11 is adhered as it is even if the electrostatic field disappears, so that the display information is retained (memory) as it is. . FIG. 5 illustrates a positively charged white display medium 13W and a negatively charged black display medium 13B.

  FIG. 6 is a diagram for explaining an example of information rewriting in the reversible information display panel used in the present invention. Once the panel on which information such as an image has been displayed is left as it is, as shown in an example in FIG. 6, the charge is applied by the new charge forming means 21 to the outer surface of the display panel on the transparent substrate 11 side. A new electrostatic field is formed. According to the newly formed electrostatic field, the display medium moves again, and the negatively charged display medium is attracted by the Coulomb force toward the positively charged substrate portion. A display medium charged to a positive polarity is attracted toward the charged substrate portion by Coulomb force or the like, and the display medium is attracted to the inner surface of the transparent substrate 11 and electrostatically attached, thereby displaying information such as an image. Rewritten. FIG. 6 illustrates a positively charged white display medium 13W and a negatively charged black display medium 13B.

  FIG. 7 is a diagram for explaining an example of display information erasure in the reversible information display panel used in the present invention. As shown in FIG. 7, charge forming means 22 and 23 are arranged on the outer surfaces of the substrates 11 and 12 of the display panel, and an alternating voltage is applied to the substrates 11 and 12, for example. Thereby, information such as images can be erased by supplying electric charges to the outer surfaces of the substrates 11 and 12 of the reversible information display panel.

  When the information display panel having the above-described configuration is used as the removable label 1, it is preferable to make each of the substrates 11 and 12 made of a plastic material in order to reduce the thickness and weight of the removable label.

  By the way, about the board | substrates 11 and 12 of an information display panel, those at least one board | substrate 11 is a transparent substrate which can confirm the color of a display medium from the outer side of a panel, and this board | substrate 11 has the high transmittance | permeability of visible light, and It is preferable to use a material having good heat resistance. The substrate 12 may be transparent or opaque. Examples of substrate materials include polymer sheets such as polyethylene terephthalate, polyethersulfone, polyethylene, polycarbonate, polyimide, and acrylic resin, flexible materials such as metal sheets, and flexibility such as glass and quartz. An inorganic sheet having no surface is mentioned.

  The thickness of the substrate is preferably 2 to 400 μm, more preferably 5 to 300 μm. If it is too thin, it will be difficult to maintain the strength and the uniformity of the distance between the substrates, and if it is thicker than 400 μm, there will be a disadvantage that the display medium will not move due to the force of an electric field such as an electrostatic latent image formed outside the substrate.

In addition, the constituent materials of the conductive members 15 and 16 provided on the substrate as necessary include metals such as aluminum, silver, nickel, copper, and gold, ITO, indium oxide, conductive tin oxide, and conductive zinc oxide. Examples thereof include conductive metal oxides such as polyaniline, polypyrrole, polythiophene, and the like, which are appropriately selected and used. As a method for forming a conductive member, the above-described materials are formed into a thin film by sputtering, vacuum deposition, CVD (chemical vapor deposition), coating, or the like, or a conductive agent is mixed with a solvent or a synthetic resin binder. Then, a method of coating is used.
In this case, the conductive member 16 provided on the viewing side substrate needs to be transparent, but the conductive member 15 provided on the back side substrate does not need to be transparent. In any case, the above-mentioned material that can form a pattern and is conductive can be preferably used.

  The thickness of the conductive member is not particularly limited as long as the conductivity can be secured and the light transmittance is not hindered, and is preferably 3 to 1000 nm, preferably 5 to 400 nm. The material and thickness of the conductive member 15 provided on the back side substrate are the same as those of the conductive member 16 provided on the viewing side substrate described above, but need not be transparent.

  Also, as for the partition 14 provided as necessary, the shape is appropriately set appropriately depending on the type of display medium related to the display, and thus cannot be specified unconditionally, but the width of the partition is 2 The height of the partition wall is adjusted to 10 to 100 μm, preferably 10 to 50 μm. In forming the partition walls, a double rib method in which ribs are formed on each of the opposing substrates 11 and 12 and then bonded, and a single rib method in which ribs are formed only on one substrate are conceivable. In the present invention, any method is preferably used.

  The cells formed by the partition walls 14 made of these ribs are illustrated in a schematic plan view in FIG. 8 in a square shape, a triangular shape, a line shape, a circular shape, and a hexagonal shape as viewed from the substrate plane direction. Is exemplified by a lattice shape, a honeycomb shape, or a mesh shape. It is better to make the part corresponding to the partition part visible from the display surface side (the area of the cell frame part) as small as possible, and the clearness of information display increases.

  Here, examples of the method for forming the partition include a mold transfer method, a screen printing method, a sand blast method, a photolithography method, and an additive method. Any of these methods can be suitably used for the information display panel according to the present invention, and among these, a photolithography method using a resist film and a mold transfer method are suitably used.

  Next, display medium particles (hereinafter also referred to as particles) constituting the display medium 13 used in the information display panel will be described. The particles for the display medium can form a particle group by itself to form a display medium, form a particle group combined with other particles to form a display medium, or can be adjusted to become a powder fluid described later to be a display medium. However, in the present invention, a display medium configured with at least magnetic particles is not used. The particles can contain a charge control agent, a colorant, an inorganic additive, and the like, if necessary, in the resin as the main component as in the conventional case. Examples of resins, charge control agents, colorants, and other additives will be given below.

  Examples of the resin include urethane resin, urea resin, acrylic resin, polyester, acrylic urethane resin, acrylic urethane silicone resin, acrylic urethane fluororesin, acrylic fluororesin, silicone resin, acrylic silicone resin, epoxy resin, polystyrene, styrene acrylic resin Polyolefin, butyral resin, vinylidene chloride resin, melamine resin, phenol resin, fluororesin, polycarbonate, polysulfone, polyether, polyamide and the like, and two or more kinds can be mixed. In particular, acrylic urethane resin, acrylic silicone resin, acrylic fluororesin, acrylic urethane silicone resin, acrylic urethane fluororesin, fluororesin, and silicone resin are suitable from the viewpoint of controlling the adhesive force with the substrate.

The charge control agent is not particularly limited. Examples of the negative charge control agent include salicylic acid metal complexes, metal-containing azo dyes, metal-containing oil-soluble dyes (including metal ions and metal atoms), and quaternary ammonium salt systems. Examples thereof include compounds, calixarene compounds, boron-containing compounds (benzyl acid boron complexes), and nitroimidazole derivatives.
Examples of the positive charge control agent include nigrosine dyes, triphenylmethane compounds, quaternary ammonium salt compounds, polyamines, and imidazole derivatives.
In addition, metal oxides such as ultrafine silica, ultrafine titanium oxide, ultrafine alumina, nitrogen-containing cyclic compounds such as pyridine and derivatives and salts thereof, various organic pigments, resins containing fluorine, chlorine, nitrogen, etc. are also charged. It can also be used as a control agent.

  As the colorant, various organic or inorganic pigments and dyes as exemplified below can be used.

Examples of the black colorant include carbon black, copper oxide, manganese dioxide, aniline black, activated carbon and the like.
Examples of blue colorants include C.I. I. Pigment blue 15: 3, C.I. I. Pigment Blue 15, Bituminous Blue, Cobalt Blue, Alkaline Blue Lake, Victoria Blue Lake, Phthalocyanine Blue, Metal-free Phthalocyanine Blue, Phthalocyanine Blue Partial Chlorides, Fast Sky Blue, Indanthrene Blue BC, and the like.

  Examples of red colorants include bengara, cadmium red, red lead, mercury sulfide, cadmium, permanent red 4R, resol red, pyrazolone red, watching red, calcium salt, lake red D, brilliant carmine 6B, eosin lake, rhodamine lake B, Alizarin Lake, Brilliant Carmine 3B, C.I. I. Pigment Red 2 etc.

Examples of yellow colorants include yellow lead, zinc yellow, cadmium yellow, yellow iron oxide, mineral first yellow, nickel titanium yellow, navel yellow, naphthol yellow S, Hansa Yellow G, Hansa Yellow 10G, Benzidine Yellow G, Benzidine Yellow GR, Quinoline Yellow Lake, Permanent Yellow NCG, Tartrazine Lake, C.I. I. Pigment Yellow 12 etc.
Examples of green colorants include chrome green, chromium oxide, pigment green B, C.I. I. Pigment Green 7, Malachite Green Lake, Final Yellow Green G, etc.

Examples of the orange colorant include red chrome yellow, molybdenum orange, permanent orange GTR, pyrazolone orange, Vulcan orange, indanthrene brilliant orange RK, benzidine orange G, indanthrene brilliant orange GK, C.I. I. Pigment Orange 31 etc.
Examples of purple colorants include manganese purple, first violet B, and methyl violet lake.
Examples of white colorants include zinc white, titanium oxide, antimony white, and zinc sulfide.

  Examples of extender pigments include barite powder, barium carbonate, clay, silica, white carbon, talc, and alumina white. Examples of various dyes such as basic, acidic, disperse, and direct dyes include nigrosine, methylene blue, rose bengal, quinoline yellow, and ultramarine blue.

Examples of inorganic additives include titanium oxide, zinc white, zinc sulfide, antimony oxide, calcium carbonate, lead white, talc, silica, calcium silicate, alumina white, cadmium yellow, cadmium red, cadmium orange, titanium yellow, Examples include bitumen, ultramarine blue, cobalt blue, cobalt green, cobalt violet, iron oxide, carbon black, manganese ferrite black, cobalt ferrite black, copper powder, and aluminum powder.
These pigments and inorganic additives can be used alone or in combination. Of these, carbon black is particularly preferable as the black pigment, and titanium oxide is preferable as the white pigment.

  Moreover, it is preferable that the particles constituting the display medium 13 have a mean particle diameter d (0.5) in the range of 3 to 10 μm and are uniform and uniform. If the average particle diameter d (0.5) is larger than this range, the display is not clear. If the average particle diameter d (0.5) is smaller than this range, the cohesive force between the particles becomes too large, which hinders the movement of the display medium. .

Furthermore, here, regarding the particle size distribution of each particle, the particle size distribution Span represented by the following formula is set to less than 5, preferably less than 3.
Span = (d (0.9) −d (0.1)) / d (0.5)
(However, d (0.5) is a numerical value expressed in μm that the particle diameter is 50% larger than this and 50% smaller than this, and d (0.1) is the ratio of particles smaller than 10%. % Is a numerical value expressing the particle diameter in μm, and d (0.9) is a numerical value expressing the particle diameter in which 90% or less of the particles are less than this in μm.)
By keeping Span within a range of 5 or less, the size of each particle is uniform, and uniform particle movement becomes possible.

  Furthermore, regarding the correlation of each particle, the ratio of the d (0.5) of the particle having the minimum diameter to the d (0.5) of the particle having the maximum diameter among the used particles is 50 or less, preferably 10 or less. Is important.

The particle size distribution and the particle size can be obtained from a laser diffraction / scattering method or the like. When laser light is irradiated onto particles to be measured, a light intensity distribution pattern of diffracted / scattered light is spatially generated, and this light intensity pattern has a corresponding relationship with the particle diameter, so that the particle diameter and particle diameter distribution can be measured. .
Here, the particle size and the particle size distribution are obtained from a volume-based distribution. Specifically, using a Mastersizer2000 (Malvern Instruments Ltd.) measuring instrument, the particles are put into a nitrogen stream and the attached analysis software (software based on volume-based distribution using Mie theory) The diameter and particle size distribution can be measured.

  Next, for example, the powder fluid used as the display medium 13 used for the information display panel will be described. For example, the applicant has obtained the right of “Electronic Powder Fluid (registered trademark): Registration Number 4636931” for the name of the powder fluid used as the display medium in the present invention.

  The “powdered fluid” here is a substance in an intermediate state of both fluid and particle characteristics that exhibits fluidity by itself without borrowing the force of gas or liquid. For example, a liquid crystal is defined as an intermediate phase between a liquid and a solid, and has fluidity that is a characteristic of a liquid and anisotropy (an optical property) that is a characteristic of a solid. (Heibonsha: Encyclopedia). On the other hand, the definition of particle is an object with a finite mass even if it is negligible, and is said to be affected by gravity (Maruzen: Physics Encyclopedia). Here, even in the case of particles, there are special states of gas-solid fluidized bed and liquid-solid fluids. When gas is flowed from the bottom plate to the particles, upward force is applied to the particles according to the velocity of the gas. Is a gas-solid fluidized bed that is in a state where it can easily flow when it balances with gravity, and it is also called a liquid-solid fluidized state that is fluidized by a fluid (ordinary) Company: Encyclopedia). As described above, the gas-solid fluidized bed body and the liquid-solid fluid are in a state of using a gas or liquid flow. Therefore, it has been found here that a substance in a state of fluidity can be produced specifically without borrowing the force of such gas and liquid, and this is defined as a powder fluid.

  That is, the pulverulent fluid in the present invention is an intermediate state having both particle and liquid properties, as in the definition of liquid crystal (liquid and solid intermediate phase), and the gravity characteristic that is the characteristic of the particles described above. It is a substance that is extremely unaffected and exhibits a unique state with high fluidity. Such a substance can be obtained in an aerosol state, that is, in a dispersion system in which a solid or liquid substance is stably suspended as a dispersoid in a gas. In the information display panel according to the present invention, a solid substance can be obtained as a dispersoid. To do.

  The information display panel according to the present invention comprises a powder fluid exhibiting high fluidity in an aerosol state in which solid particles are stably suspended as a dispersoid, for example, as a display medium between opposing substrates, at least one of which is transparent. Such a powder fluid can be easily and stably moved by a Coulomb force by applying a low voltage. As described above, this powdered fluid is a substance in an intermediate state of both fluid and particle characteristics that exhibit fluidity by itself without borrowing the force of gas or liquid. The powder fluid can be in an aerosol state in particular, and in the information display panel according to the present invention, a solid substance is used in a state of being relatively stably suspended as a dispersoid in the gas.

  The charge amount of the display medium particles naturally depends on the measurement conditions, but the charge amount of the display medium particles in the information display panel is almost the initial charge amount, the contact with the partition wall, the contact with the substrate, the charge associated with the elapsed time. It was found that depending on the attenuation, the saturation value of the charging behavior of the particles for the display medium is a dominant factor.

  In addition, when used in a dry information display panel that uses particles or powdered fluid composed of particles for display media as they are as the display medium, it is important to manage the gas in the void surrounding the display medium between the panel substrates. Contributes to the improvement of stability. Specifically, it is important that the relative humidity at 25 ° C. is 60% RH or less, preferably 50% RH or less, and more preferably 35% RH or less. When used in a dry information display panel in which a particle group composed of particles or powdered fluid is enclosed in a capsule and used as a display medium, the management of the gas in the void surrounding the display medium between the panel substrates is not so important. .

  3A to 3C and FIGS. 4A to 4C, the gaps are defined by the conductive members 15 and 16 (the conductive members from the portions sandwiched between the opposing substrates 11 and 12). In this case, the gas portion in contact with the so-called display medium 13 excluding the occupied portion of the display medium 13, the occupied portion of the partition wall 14 (when the partition wall is provided), and the seal portion of the information display panel.

  The gas in the gap is not limited as long as it is in the humidity region described above, but dry air, dry nitrogen, dry argon, dry helium, dry carbon dioxide, dry methane, and the like are preferable. This gas needs to be sealed in the information display panel so that the humidity is maintained. For example, filling of the display medium, assembly of the information display panel, etc. are performed in a predetermined humidity environment. It is important to apply a sealing material and a sealing method that prevent moisture from entering.

Here, the distance between the substrate 11 and the substrate 12 in the information display panel is not limited as long as the display medium (13W, 13B) can be moved and the contrast can be maintained, but is usually adjusted to 10 to 100 μm, preferably 10 to 50 μm. The The volume occupation ratio of the display medium 13 (particle group or powder fluid) in the space between the opposing substrates is preferably 5 to 70%, more preferably 5 to 60%. When it exceeds 70%, the movement of the display medium (13W, 13B) is hindered, and when it is less than 5%, the contrast tends to be unclear.
The total thickness of the reversible information display panel of the present invention is preferably 10 μm or more and less than 1 mm.

  The removable label using the reversible information display panel of the present invention can erase the displayed information securely and then display new information as many times as possible. Is not necessary, and the cost and the man-hours required therefor can be greatly reduced, and at the same time, it can be suitably used for applications that sufficiently prevent resource consumption.

(A), (b) is a top view which shows embodiment of the removable label which concerns on this invention, respectively. (A), (b) is a top view which shows embodiment of the detachable label which concerns on this invention, respectively, (c) is a schematic diagram which shows the cross section of the said detachable label, (d) is (b). It is a figure which shows typically AA cross section. (A)-(c) is a figure which shows an example of the structure in the reversible information display panel used by this invention, respectively. (A)-(c) is a figure which shows the other example of the structure in the reversible information display panel of this invention, respectively. It is a figure for demonstrating an example of the information display in the reversible information display panel used by this invention. It is a figure for demonstrating an example of the display information rewriting in the reversible information display panel used by this invention. It is a figure for demonstrating an example of the information deletion in the reversible information display panel used by this invention. It is an approximate line top view showing the example of arrangement of the cell divided by the partition.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Removable label 1a, 1b Information display area 11, 12 Board | substrate 13 Display medium (particle group or powder fluid)
13W White display medium 13B Black display medium 14 Bulkhead 15, 16 Conductive member 17 Capsule 21, 22, 23 Charge forming means

Claims (6)

The display medium is enclosed in a sealed space between two substrates facing each other and at least one of which is transparent, and the display medium is moved by an electric field generated by the electric charge formed on the substrate surface to move to the transparent substrate side. It is a detachable label having a display unit comprising a reversible and dry information display panel for displaying required information,
Two types of display media, each composed of two types of particles for display media, which are different in color and charging characteristics and both have an average particle diameter in the range of 3 to 10 μm, and the total thickness of the information display panel is 10 μm or more A detachable label using a reversible information display panel characterized by being less than 1 mm.   2. A removable label using a reversible information display panel according to claim 1, wherein the display medium sealed in the sealed space between the substrates is mainly composed of insulating particles and does not contain magnetic particles.   The thickness between at least one of the two substrates is 0.4 mm or less, and the distance between the substrates formed by the two substrates facing each other is 0.1 mm or less. Or a detachable label using the reversible information display panel according to 2.   The removable label using the reversible information display panel according to any one of claims 1 to 3, wherein each substrate is made of a plastic material.   5. A plurality of information display areas are provided in the removable label, and the combination of two types of display media to be combined for each information display area can be changed. A detachable label using the reversible information display panel described in 1.   The reversible information display panel according to any one of claims 1 to 5, wherein a particle group composed of particles for display medium or a powder fluid composed of particles for display medium is used as the display medium. Removable label using

Images