JPH05108016A - Visible display device - Google Patents

Abstract

PURPOSE:To make a visual display bright by using a magnetic metal powder containing nickel to constitute magnetic flakes the orientation of which can be changed according to magnetic fields. CONSTITUTION:This device has a transparent substrate 200, microcapsule layer 30 to form the visual display area, and a magnetic sheet 40 which forms a magnetic field to hold a magnetic recording area and to make visual display. The microcapsule layer 30 has microcapsules 32 dispersed in a binder 31, and the microcapsule 32 contains magnetic flakes 34 with an oil. These magnetic flakes 34 consist of a magnetic metal powder containing nickel. Namely, the magnetic metal powder containing nickel shows white gloss to make the color of magnetic flakes 34 bright. Therefore, contrast in the visual display area according to the difference in the orientation direction of the magnetic flakes 34 can be improved, which make the visual display bright.

Description

Detailed Description of the Invention

[0001]

[Object of the Invention]

[0002]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a visual display device,
In particular, a plurality of microcapsules, which contain magnetic flakes whose orientation direction can be changed according to the magnetic field together with oil and whose reflection direction of visible incident light can be changed depending on the orientation direction, are arranged on the surface of the transparent substrate. The present invention relates to a visible display device which becomes a visible display region by forming a microcapsule layer by dispersing it in the binder.

[0003]

2. Description of the Related Art Conventionally, as this type of visual display device,
A microcapsule layer is formed by attaching microcapsules containing oil and magnetic flakes to the surface of a transparent substrate with a transparent binder, and visible when the magnetic flakes are oriented parallel to the surface of the transparent substrate. Reflects incident light to visually display the bright color of magnetic flakes, and when the magnetic flakes are oriented perpendicular to the surface of the transparent substrate, does not reflect visible incident light and has a dark color of the magnetic sheet.
It has been proposed that a visible display (for example, black) is achieved and a visible display is achieved by the contrast between them.

[0004]

[Problems to be solved] However, in the conventional visible display device, since the magnetic flakes contained in the microcapsules together with the oil were formed by the plate-shaped magnetic metal powder containing iron as a main component, (i) The magnetic flakes have the drawback that they exhibit a color such as red, brown, or black depending on the oxidation state of iron. Therefore, (ii) a sufficient contrast between the colors of the magnetic flakes and the dark colors of the magnetic sheet is ensured. There are drawbacks that cannot be solved, and eventually (iii)
There was a drawback that the visual display became unclear.

Therefore, in the present invention, for the purpose of eliminating this defect, the magnetic flakes contained in the microcapsules in the microcapsule layer formed as a visible display region on the transparent substrate are treated with a magnetic metal powder containing nickel. It is intended to provide a visible display device formed.

[0006]

[Constitution of the invention]

[0007]

[Means for Solving the Problems] The means for solving the problems provided by the present invention is that "a magnetic flake whose orientation direction is changed in response to a magnetic field is housed together with oil to reflect visible incident light depending on the orientation direction. In a visible display device in which a plurality of microcapsules whose directions are changed are dispersed in a binder disposed on the surface of a transparent base material to form a microcapsule layer as a visible display region, the magnetic flakes (34) are nickel. It is formed of magnetic metal powder containing a "visible display device".

[0008]

In the visual display device according to the present invention, as clearly described in the above [Means for Solving Problems], the magnetic flakes whose orientation direction can be changed according to the magnetic field are accommodated together with the oil, and depending on the orientation direction. A visible display device in which a plurality of microcapsules in which the reflection direction of visible incident light is changed is dispersed in a binder arranged on the surface of a transparent substrate to form a microcapsule layer as a visible display region, In particular, since the magnetic flakes are formed of a magnetic metal powder containing nickel, (i) the effect of making the color of the magnetic flakes a bright color,
As a result, (ii) it has a function of ensuring the contrast of the visible display, and consequently (iii) has a function of making the visible display clear.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, a visual display device according to the present invention will be specifically described with reference to the accompanying drawings and preferred embodiments.

However, the embodiment described below
It is described to facilitate or facilitate understanding of the present invention, and not to limit the present invention.

In other words, each element disclosed in the embodiments described below includes all design changes and equivalent replacements within the spirit and technical scope of the present invention.

(Description of the accompanying drawings)

FIG. 1 is a partial cross-sectional perspective view showing an embodiment of a visible display device according to the present invention, and in particular, a microcapsule layer 30 which functions as a visible display region on one surface of a transparent substrate 20. Is arranged and the microcapsule layer
It shows a state in which the magnetic sheet 40 is arranged on the surface of 30 so as to form a magnetic field for visible display.

FIG. 2 is a partially enlarged sectional view showing an enlarged part of the embodiment shown in FIG. 1, particularly when the magnetization direction of the magnetic sheet 40 is parallel to the surface. 3 shows the correlation between the magnetization direction of the magnetic sheet 40 and the orientation direction of the magnetic flakes 34 contained in the microcapsules 32 in the microcapsule layer 30 .

FIG. 3 is a partially enlarged cross-sectional view showing a part of the embodiment shown in FIG. 1 in an enlarged manner. In particular, when the magnetization direction of the magnetic sheet 40 is perpendicular to the surface. 3 shows the correlation between the magnetization direction of the magnetic sheet 40 and the orientation direction of the magnetic flakes 34 contained in the microcapsules 32 in the microcapsule layer 30 .

FIGS. 4A and 4B are flowcharts showing an example of the manufacturing procedure of the embodiment shown in FIG.

(Structure of Example)

First, with reference to FIGS. 1 to 3, the structure of an embodiment of a visual display device according to the present invention will be described in detail.

A visible display device 10 according to the present invention includes a transparent base material 20 , a microcapsule layer 30 arranged to form a visible display region on at least one surface of the transparent base material 20 , A magnetic sheet 40 which is arranged on the surface of the microcapsule layer 30 so as to form a magnetic field for visible display according to the recorded content of the magnetic recording area (that is, the magnetization state), I have a package.

The transparent base material 20 is a transparent material having an appropriate thickness.
(For example, polyethylene terephthalate film)
And is functioning as a holder for the microcapsule layer 30 .

The microcapsule layer 30 contains a plurality of microcapsules 32 dispersed in a binder 31, and a suitable oily liquid (herein referred to as “oil”; eg, dodecylbenzene) 33 in each microcapsule 32. And the magnetic flake 34 formed. The binder 31 transmits the visible incident light L and the visible reflected lights L ^* and L ^** , as will be apparent from the later description, and is particularly preferably transparent.

The size of the microcapsule 32 is 30 μm to 100 μm so that the visible incident light L is sufficiently reflected and can be clearly displayed when the recorded content of the magnetic recording area included in the magnetic sheet 40 is visibly displayed. It is preferable that the degree is set.

As the magnetic flakes 34, a magnetic metal powder containing nickel is adopted. The magnetic flakes 34 may contain a magnetic metal such as iron, silicon, molybdenum, aluminum, chromium and cobalt in addition to nickel.

The reason why the magnetic metal powder containing nickel is adopted as the magnetic flakes 34 is that the magnetic metal powder containing nickel has a white luster and the color of the magnetic flakes 34 can be a bright color. Thereby, the visual display device 10 according to the present invention can improve the contrast of the visual display region due to the difference in the orientation direction of the magnetic flakes 34,
Visible display can be made clear. If the content of nickel in the magnetic metal powder used as the magnetic flakes 34 is particularly 75% by weight or more, it is possible to clearly confirm that the contrast in the visible display region is improved even when observed with the naked eye. preferable.

The magnetic flakes 34 are required to appropriately reflect the visible incident light L, and the visible reflected light L emitted to the outside of the transparent substrate 20 when the orientation direction is parallel to the surface.
Since it is necessary to remarkably increase the light amount of ^* , it is preferable that it is plate-shaped. The size of the magnetic flakes 34 needs to be appropriately determined according to the size of the microcapsules 32, but if the major axis is 5 to 30 μm, the minor axis is 1 to 10 μm, and the thickness is 0.1 to 1 μm. , Usually preferred.

Around the magnetic flakes 34, magnetic flakes
(I) Magnetic flakes 34 will aggregate with each other if a suitable surfactant that does not easily react with 34 and oil 33 (for example, Span 80 (Sorbitan monooleate from Atlas Spauder) or oleic acid) is placed. And (ii) the magnetic flakes 34 can be prevented from adhering to the wall surface of the microcapsule 32.
The magnetic flake 34 can be stably accommodated in the 32, and the contrast of the visible display region due to the difference in the orientation direction of the magnetic flake 34 can be improved.

The magnetic sheet 40 is made in a well-known manner by arranging a magnetic film (referred to as "magnetic layer") 41 on the surface of an appropriate base material 42 such as a plastic film,
The magnetic recording area is provided in the vicinity of the microcapsule layer 30 . The color of the magnetic sheet 40 (that is, the magnetic layer
41 or the color of the base material 42) is, for example, black so as to ensure the contrast of the visible display. Incidentally, the magnetic sheet 40 may be replaced with an appropriate magnetic field generating means as long as it can form a magnetic field in the visible display region, but here, for convenience of description, only this case will be described. Therefore, in the visible display device 10 according to the present invention, the magnetic sheet is used as the magnetic field generating means for forming a magnetic field in the visible display region.
It is not limited to only 40 .

(Manufacturing Procedure)

Further, with reference to FIGS. 1 to 4B, in order to deepen the understanding of an embodiment of the visual display device according to the present invention, an example of the manufacturing procedure thereof will be specifically described.

Dispersion of magnetic flakes 34

Magnetic metal powder (ie, "magnetic flakes 34") of suitable shape (eg, plate-like) containing an appropriate amount of nickel, made in a well known manner, together with an appropriate surfactant (eg, oleic acid). After being dispersed in oil (here, dodecylbenzene; the same applies below) 33 (the resulting product is called "magnetic flake dispersion liquid"), a stirrer
(For example, ultrasonic stirrer)
Stir for sufficient time.

Creation of microcapsules 32

By mixing water, gelatin, gum arabic and the like in appropriate proportions and stirring them sufficiently, a gelatin-rubber mixed solution which will be the binder 31 of the microcapsule layer 30 is prepared. Gelatin gum mixture is, for example, 650cc of water
And 10 g of gelatin (isoelectric point pH 4.5) and 10 g of gum arabic
It may be prepared by mixing and with each other and sufficiently stirring. Hereinafter, this case will be exemplified, but the present invention is not limited to this, and a desired material may be used in a desired ratio as long as the microcapsule layer 30 can be formed.

The gelatin rubber mixed solution is heated to an appropriate temperature while continuing the stirring for facilitating the reaction after the stirring is appropriately progressed.

The magnetic flake dispersion is added little by little to the gelatin rubber mixture under stirring and mixed, and the mixture is stirred for an appropriate time to disperse the fine particles of the magnetic flake dispersion (resultant). “Intermediate dispersion”
That).

An aqueous acetic acid solution (for example, 10% by weight) is added dropwise to the intermediate dispersion until the pH reaches 4, while stirring is continued. This forms a coacervate film of gelatin and gum arabic around the fine particles of the magnetic flake dispersion (substantially dodecylbenzene).

The dropwise addition of the aqueous acetic acid solution coagulates the coacervate film of gelatin and gum arabic placed around the fine particles of the magnetic flake dispersion (essentially dodecylbenzene). For the purpose, it is allowed to cool to a moderate temperature with stirring.

In the cooled intermediate dispersion, the gelatin and gum arabic formed around the fine particles of the magnetic flake dispersion (substantially dodecylbenzene) by binding to the deprotonated amino groups in the gelatin. Formaldehyde is added in an appropriate amount for the purpose of further solidifying the coacervate film. As a result, the microcapsules 32 are dispersed in gelatin and gum arabic (this is referred to as "microcapsule liquid"). The microcapsule 32 contains a magnetic flake dispersion liquid (and thus the magnetic flake 34 and oil (here, dodecylbenzene) 33).

An aqueous sodium carbonate solution (for example, 20% by weight) was added to the microcapsule solution for the purpose of promoting the elimination of protons from the amino groups of gelatin while continuing the stirring.
It is added dropwise until the pH reaches 9.5.

The microcapsule solution should have a sufficient time.
After stirring for (for example, 3 to 30 hours), the microcapsules 34 are left to stand for a suitable time (for example, 24 hours) in order to make the microcapsules 34 float (hereinafter referred to as “floating capsules”).

Removal of empty capsules

The floating capsules in the microcapsule liquid are
It is taken out by an appropriate means. Pure water is added to the removed floating capsules (the resulting product is called "floating capsule liquid").

The floating capsule liquid is stirred for a sufficient time and then placed in a magnetic field of appropriate strength to remove the microcapsules containing no magnetic flakes 34 (referred to as "empty capsules").

In the floating capsule liquid, whether or not the remaining amount of empty capsules is equal to or less than a predetermined value is determined in the remaining amount determination process of empty capsules.

The floating capsule liquid is repeatedly processed until the residual amount of the empty capsules becomes less than a predetermined value by repeating the pure water adding process or the empty capsule residual amount determining process to remove the empty capsules.

Arrangement on transparent substrate 20

The floating capsule liquid is adjusted to an appropriate concentration (for example, the content concentration of the microcapsules is 50% by weight) when the residual amount of the empty capsules is equal to or less than a predetermined value, and then a separately prepared transparent substrate ( For example, a microcapsule layer 30 is formed by coating one surface of a polyethylene terephthalate film) 20 with an appropriate thickness (for example, 100 μm to 200 μm) and drying and solidifying.

Arrangement of magnetic sheet 40

On the surface of the microcapsule layer 30 provided on the transparent base material 20 , a magnetic layer is formed on one surface of a base material (eg, polyethylene terephthalate film) 42 which is separately prepared.
By arranging the magnetic sheet 40 on which 41 is arranged in an appropriate manner, the visible display device 10 according to the present invention is obtained.

(Operation of Example)

Next, the operation of an embodiment of the visual display device according to the present invention will be described in detail with reference to FIGS.

When the magnetization direction in the magnetic recording area of the magnetic sheet 40 is changed from the direction parallel to the surface (see FIG. 2) to the direction perpendicular to the surface (see FIG. 3), the surface of the magnetic sheet 40 (that is, the magnetic layer). magnetic flakes 34 housed in microcapsules 32 in the microcapsule layer 30 which has been brought oriented in a direction parallel to the surface) of 41, the magnetic sheet 40
The orientation direction is changed in a direction orthogonal to the surface of the transparent layer 20 (that is, the surface of the magnetic layer 41), and the visible incident light L incident through the transparent substrate 20 is hardly reflected to the outside of the transparent substrate 20. .. Therefore, the visible incident light L, the surface of the magnetic layer 41 constituting the magnetic sheet 40 through the substrate 42 constituting the magnetic sheet 40 (i.e. facing surface on the surface of the microcapsule layer 30 (hereinafter (Referred to as “one surface”)), the transparent base material 20 ^becomes visible reflected light L ^**.
Will be emitted to the outside. Therefore, at this time, the color of one surface of the magnetic layer 41 is visually displayed in the visible display area. By the way, on one surface of the magnetic layer 41, a relatively large amount of visible incident light L is absorbed, and the amount of visible reflected light L ^** emitted to the outside of the transparent substrate 20 is small. When the color of the one surface of the magnetic layer 41 is black, the absorption amount of the visible input light L increases, and the visible reflected light L ^** is substantially not emitted to the outside of the transparent substrate 20 .

On the other hand, when the magnetization direction in the magnetic recording area of the magnetic sheet 40 is changed from the direction perpendicular to the surface (see FIG. 3) to the original parallel direction (see FIG. 2), the microcapsule layer is formed. The magnetic flakes 34 accommodated in the microcapsules 32 in 30 have the orientation direction changed in a direction parallel to the surface of the magnetic sheet 40 , and thus the transparent base material.
The visible incident light L incident via 20 is sufficiently reflected toward the outside of the transparent substrate 20 . Therefore, at this time, the color of the magnetic flakes 34 is visually displayed in the visible display area.

In short, the visual display device 10 according to the present invention
According to the microcapsules 32 of the microcapsule layer 30
The magnetic flakes 34 accommodated therein are formed of a nickel-containing magnetic metal powder exhibiting a bright color, and the magnetic layer 41 forming the magnetic sheet 40 is a color having a large contrast (for example, black) with respect to the bright color. Therefore, it is possible to secure a sufficient contrast in the visible display area when the orientation direction of the magnetic flakes 34 changes, and thus it is possible to clearly and visually display the recorded content recorded in the magnetic recording area of the magnetic sheet 40 .

(Specific example)

In addition, in order to facilitate understanding of the visual display device according to the present invention, more detailed description will be given using numerical values and the like.

Example 1

10 g of plate-shaped magnetic metal powder having a nickel content of 100% by weight (that is, plate-shaped nickel powder)
Was dispersed in 150 cc of dodecylbenzene as an oil together with 2 g of oleic acid as a surface active agent, then stored in an ultrasonic stirrer and stirred for 4 hours to obtain a magnetic flake dispersion liquid.

650 cc of water is 10 g of gelatin (isoelectric point pH 4.5)
Then, after mixing with 10 g of gum arabic and stirring, the mixture was heated to 40 ° C. for facilitating the reaction to obtain a gelatin gum mixed solution which became the binder 31 of the microcapsule layer 30 .

The gelatin rubber mixed solution was stirred at a stirring speed of 1300 rpm and the magnetic flake dispersion was added little by little, and then the stirring was continued for 70 minutes to obtain an intermediate dispersion of pH 6.0. It was regarded as a liquid.

To the intermediate dispersion liquid, 10% by weight of acetic acid aqueous solution was added dropwise to pH 4 while continuing stirring, and further 1300
Stirring was continued for 30 minutes at a stirring speed of revolutions / minute. This formed a coacervate film of gelatin and gum arabic around the fine particles of the magnetic flake dispersion (substantially dodecylbenzene). Furthermore, 30
After a lapse of minutes, the intermediate dispersion was cooled to 10 ° C., whereby the gelatin and gum arabic coacervate film formed around the fine particles of the magnetic flake dispersion was coagulated.

In the intermediate dispersion liquid cooled to 10 ° C., gelatin formed around fine particles of the magnetic flake dispersion liquid (substantially dodecylbenzene) by binding to deprotonated amino groups in gelatin and For the purpose of further coagulating the gum arabic coacervate film, formaldehyde was added in an appropriate amount to form a microcapsule solution.

To the microcapsule solution, 20% by weight aqueous sodium carbonate solution was added dropwise to pH 9.5 for the purpose of promoting the elimination of protons from the amino groups in gelatin while continuing stirring. The stirring was continued for another 24 hours, and the microcapsules were allowed to stand for 24 hours so as to be suspended.

The microcapsules suspended in the stationary microcapsule liquid (that is, floating capsules) were taken out, and pure water was added thereto to obtain a floating capsule liquid.

The floating capsule liquid was stirred and then placed in a magnetic field to separate and remove empty capsules.

In the floating capsule liquid from which the empty capsules were removed, the remaining amount of empty capsules was determined in the remaining amount determination process of empty capsules.

The floating capsule liquid was repeatedly processed by the step of adding pure water or the step of determining the residual amount of empty capsules until the residual amount of empty capsules became a predetermined value or less.

The floating capsule liquid from which the empty capsules were sufficiently removed was adjusted to have a microcapsule concentration of 50% by weight, and then the surface of the polyethylene terephthalate film as a transparent substrate (adhesive was previously attached The coating solution was applied to the above, heated to 80 ° C. and heat-treated for 30 minutes to be dried and solidified to form a microcapsule layer.

The surface of the microcapsule layer provided on the polyethylene terephthalate film as a transparent substrate is adhesive (pre-attached to the other surface of the polyethylene terephthalate film having a black magnetic layer provided on one surface). Adhesive) and then heated to 120 ° C.
It was made a visible display device by being heat-treated for 30 minutes.

In the visible display device, the magnetic flakes contained in the microcapsules in the microcapsule layer are first formed by setting the magnetization direction in the magnetic recording area of the magnetic sheet to be parallel to the surface of the magnetic sheet by an external magnet. It was oriented in a direction parallel to the surface of the magnetic sheet. The lightness index L _{P at} this time was 45.0 as shown in Table 1 when measured by a lightness difference meter (Suga Test Instruments Co., Ltd., SM Color Computer, SM-5, photometric area 0.20 cm ² ).

In the visible display device, the magnetic flakes contained in the microcapsules in the microcapsule layer are formed by making the magnetization direction in the magnetic recording area of the magnetic sheet perpendicular to the surface by the external magnet. It was oriented in a direction perpendicular to the surface of the magnetic sheet. The lightness index L _{V at} this time was 15.0 as shown in Table 1 as measured by the above-described lightness difference meter.

[0072] Thus, the contrast K of visual display (= L _P -L _V), as shown in Table 1, was 30.0.

Example 2

In Example 2, instead of the plate-shaped magnetic metal powder having a nickel content of 100% by weight, a plate-shaped magnetic metal powder having a nickel content of 85% by weight and an iron content of 10% by weight was used. Example 1 was repeated, except that the magnetic metal powder of Example 1 was adopted, and a visual display device was manufactured.

The lightness index L _P and the lightness index L _V of the visual display device were 44.0 and 15.0 as shown in Table 1 when measured in the same manner as in Example 1.

[0076] Thus, the contrast K of visual display (= L _P -L _V), as shown in Table 1, was 29.0.

Example 3

In Example 3, instead of the plate-shaped magnetic metal powder having a nickel content of 100% by weight, a plate-shaped magnetic metal powder having a nickel content of 75% by weight and an iron content of 20% by weight was used. Example 1 was repeated, except that the magnetic metal powder of Example 1 was adopted, and a visual display device was manufactured.

The lightness index L _P and the lightness index L _V of the visual display device were 43.0 and 15.0, as shown in Table 1, when measured in the same manner as in Example 1.

[0080] Thus, the contrast K of visual display (= L _P -L _V), as shown in Table 1, was 28.0.

Example 4

In Example 4, instead of the plate-shaped magnetic metal powder having a nickel content of 100% by weight, a plate-shaped magnetic metal powder having a nickel content of 70% by weight and an iron content of 25% by weight was used. Example 1 was repeated, except that the magnetic metal powder of Example 1 was adopted, and a visual display device was manufactured.

The lightness index L _P and the lightness index L _V of the visual display device were 35.0 and 15.0 as shown in Table 1 when measured in the same manner as in Example 1.

[0084] Thus, the contrast K of visual display (= L _P -L _V), as shown in Table 1, was 20.0.

Example 5

In Example 5, instead of the plate-shaped magnetic metal powder having a nickel content of 100% by weight, a plate-shaped magnetic metal powder having a nickel content of 50% by weight and an iron content of 45% by weight was used. Example 1 was repeated, except that the magnetic metal powder of Example 1 was adopted, and a visual display device was manufactured.

The lightness index L _P and the lightness index L _V of the visual display device were 32.0 and 15.0, as shown in Table 1, when measured in the same manner as in Example 1.

[0088] Thus, the contrast K of visual display (= L _P -L _V), as shown in Table 1, was 17.0.

Example 6

In Example 6, the plate-shaped magnetic metal powder having a nickel content of 100% by weight was replaced with a plate-shaped magnetic metal powder having a nickel content of 10% by weight and an iron content of 85% by weight. Example 1 was repeated, except that the magnetic metal powder of Example 1 was adopted, and a visual display device was manufactured.

The lightness index L _P and the lightness index L _V of the visual display device were 25.0 and 15.0, as shown in Table 1, when measured in the same manner as in Example 1.

[0092] Thus, the contrast K of visual display (= L _P -L _V), as shown in Table 1, was 10.0.

[0093]

[Table 1]

Comparative Example

Instead of the plate-shaped magnetic metal powder having a nickel content of 100% by weight, the nickel content is 0% by weight.
Example 1 was repeated, except that a plate-shaped magnetic metal powder having an iron content of 95% by weight was used and a visual display device was manufactured.

The lightness index L _P and the lightness index L _V of the visual display device were 20.0 and 15.0 as shown in Table 1 when measured in the same manner as in Example 1.

[0097] Thus, the contrast K of visual display (= L _P -L _V), as shown in Table 1, was 5.0.

Comparison between Examples 1 to 6 and Comparative Example

As is clear from a comparison between Examples 1 to 6 and Comparative Example, according to the present invention, the magnetic flakes contained in the microcapsules of the microcapsule layer are tabular magnetic metal powders containing nickel. Since the magnetic flakes have a sufficiently bright color, the contrast in the visible display area can be sufficiently secured due to the difference in the orientation direction of the magnetic flakes. The recorded contents recorded in can be clearly displayed.

(Modification)

In the above description, the case where the base material 42 of the magnetic sheet 40 is transparent and the magnetic layer 41 has a dark color has been described, but the present invention is not limited to this, and the magnetic sheet is not limited thereto. It also includes cases where the substrate of is opaque and has a dark color (for example, black). In this case, the color of the magnetic layer of the magnetic sheet may be a bright color.

[0102]

As is apparent from the above, the visual display device according to the present invention accommodates, together with oil, magnetic flakes whose orientation direction can be changed according to a magnetic field, as clearly shown in [Means for Solving Problems]. The multiple microcapsules whose visible incident light reflection direction changes depending on the orientation direction are dispersed in a binder placed against the surface of the transparent substrate to form a microcapsule layer, which serves as the visible display area. A visual display device, in particular, since the magnetic flakes are formed of magnetic metal powder containing nickel, it has the effect of (i) making the color of the magnetic flakes a bright color, and (ii) the visual display. Has the effect of ensuring the contrast of, and as a result (iii)
It has the effect of making the visible display clear.

[Brief description of drawings]

FIG. 1 is a partial cross-sectional perspective view showing an embodiment of a visual display device according to the present invention.

FIG. 2 is a partially enlarged cross-sectional view showing an enlarged part of the embodiment shown in FIG.

FIG. 3 is a partially enlarged cross-sectional view showing an enlarged part of the embodiment shown in FIG.

4A is a flowchart showing an example of a manufacturing procedure of the embodiment shown in FIG. 1. FIG.

FIG. 4B is a flow chart diagram showing an example of a manufacturing procedure of the embodiment shown in FIG. 1.

[Explanation of Codes] 10 : Visible display device 20: Transparent substrate 30・ ・ ・ ・ ・ Microcapsule layer 31 ・ ・ ・ Binder 32 ・ ・ ・ ・ ・・ ・ ・ ・ Microcapsule 33 ・ ・ ・ ・ ・ Oil 34 ・ ・ ・ ・ ・ Magnetic flakes 40・ ・ ・ ・・ ・ ・ ・ ・ ・ ・ ・ ・ Magnetic sheet 41 ・ ・ ・ Magnetic layer 42 ・ ・ ・ ・ ・ ・ ・ ・··Base material

Claims (1)

[Claims] 1. A plurality of microcapsules containing a magnetic flake whose orientation direction is changed in response to a magnetic field together with oil, and in which the reflection direction of visible incident light is changed depending on the orientation direction, on the surface of a transparent substrate. In a visible display device in which a microcapsule layer is formed by dispersing it in a binder disposed opposite to it to form a visible display region, the magnetic flakes (34) are formed by magnetic metal powder containing nickel. Display device.