JPH0367879B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method for changing the orientation of magnetic pieces of a microcapsule-type magnetic sheet to change the ground color of the magnetic sheet to a metallic luster color.

[Prior Art] The operating principle of a microcapsule type magnetic sheet will be explained with reference to FIG.

The magnetic sheet 1 consists of a black substrate 3 and a coating layer 2a formed by coating several layers of transparent spherical microcapsules 10 on the surface of a transparent film 2. Colored liquid 1 inside the microcapsule 10
1 and a metallic flake-like magnetic piece 12 floating in the colored liquid 11 is enclosed, and the magnetic piece 12 can change direction in the colored liquid 11 by the action of magnetic force.

When the magnetic pieces 12 of the magnetic sheet 1 are oriented perpendicularly to the substrate 3 as shown in FIG.
Incident light I from the top surface of the substrate passes between the magnetic pieces 12 and reaches the substrate 3. Since this substrate 3 is black, the incident light I is absorbed and there is no reflected light, so the magnetic sheet appears black.

When the magnetic pieces 12 of the magnetic sheet 1 are oriented parallel to the substrate 3 as shown in FIG. 5b, the magnetic sheet 1
Incident light I from the top surface of the magnetic sheet 1 hits the surface of the flaky metallic luster magnetic piece 12, is reflected, becomes reflected light R, and exits from the top surface, so that the magnetic sheet 1 appears to have a metallic luster color.

To write letters, pictures, etc. in black on the magnetic sheet 1, slide the magnetic pole part of a small permanent magnet from the surface of the magnetic sheet, which has been converted into a metallic luster color, and apply magnetic force to the magnetic piece 12. Change the orientation to vertical and change the color to black. Similarly, to erase letters, pictures, etc. that are blacked out, apply magnetic force.
The orientation of the magnetic piece 12 is changed to the horizontal direction, and the colored portion of the substrate 3 is changed to a metallic luster color.

That is, by sliding the magnetic pole surface of a rod-shaped or strip-shaped permanent magnet on the upper or lower surface of the magnetic sheet 1, the orientation of the magnetic piece 12 in that part where the magnetic force acts is changed vertically or horizontally, thereby changing the ground color. .

Conventionally, in order to erase black writing such as letters and pictures on the magnetic sheet 1 and convert it to a metallic luster color,
Usually, the magnetic sheet 1 is passed through a magnetizing coil to change the orientation of the magnetic pieces 12 to be parallel to the surface of the magnetic sheet 1. Therefore, a magnetizing coil, a power source for the magnetizing coil, a device for passing the magnetic sheet through the magnetizing coil, and the like were required.

Another method for changing the magnetic sheet 1 to a metallic luster color is to pass the magnetic sheet 1 horizontally between the N and S magnetic poles of a permanent magnet, and orient the magnetic pieces 12 horizontally on the surface of the magnetic sheet. be. However, this method requires the magnetic field between the N and S magnetic poles to be 3000e or more, and it is practically impossible to create such a magnetic field for a wide magnetic sheet 1. Therefore, it was not possible to uniformly transform the magnetic sheet 1 into a ground color with metallic luster.

The above-mentioned method of converting a magnetic sheet into a metallic luster color requires large-scale special equipment, and has problems in that it is not simple and cannot be used with wide magnetic sheets.

[Problem to be solved by the invention]

The present invention has been made in view of the above problems, and it is an object of the present invention to provide a method for changing the background color of a magnetic sheet to a metallic luster color, which can be used like a normal blackboard eraser even for a wide magnetic sheet. .

[Means to solve the problem]

A colored liquid and magnetic flakes with metallic luster suspended in the colored liquid are enclosed in transparent microcapsules, and the microcapsules are densely coated in multiple layers on a transparent film to form a magnetic sheet. , a metal of a magnetic sheet that changes the ground color of the magnetic sheet to a metallic luster color exhibited by light reflected by the magnetic pieces by applying a magnetic force from the front or back side of the magnetic sheet and changing the orientation direction of the magnetic pieces; In the method of converting to a glossy color, a striped multi-pole plate magnet is magnetized with a large number of N and S poles alternately, and the edges of the multi-pole magnetic poles of the plate magnet are moved in the sliding direction. The color of the magnetic sheet is changed by holding the magnetic sheet at an acute angle and sliding the upper or lower surface of the magnetic sheet.

[Effect]

When a striped multi-pole plate magnet 8 is placed on the surface of the magnetic sheet 1, with N and S poles alternately magnetized and the longitudinal direction of the striped magnetic poles aligned, a magnetic field is formed and the magnetic force acts on the plate. A pattern of metallic luster color and black is formed directly below the shaped magnet 8. That is, the part where the north and south poles are adjacent has a metallic luster color, and the central part of each north and south pole and both ends of the plate magnet 8 are black.

Therefore, if the plate magnet 8 is slid on one side of the magnetic sheet to apply magnetic force, a striped pattern with a band of metallic luster color M and a line of black B will be created (7th
Diagram a). Next, when this plate-shaped magnet 8 is slid at an acute angle between its longitudinal direction (the direction in which the edge 4 of the multi-pole magnetic pole extends) and the sliding direction, as the sandwiching angle is decreased, a black color B is created. The width of
When the inclination is below a certain level, the black band B disappears, and the entire sliding surface becomes metallic gloss color M (Fig. 7b).

〔Example〕

The present invention will be explained based on FIGS. 1 to 5. Components that are the same as those in the prior art will be described with the same reference numerals.

FIG. 1 shows a first embodiment.

A magnet mount 7 is made of a non-magnetic material, and a plurality of plate magnets 8 are arranged in parallel on its surface. The plate magnet 8 has an N pole and an S pole (for example, a thickness of 0.4
mm, each piece is made of a flexible magnetic material with a width of 3 mm) are alternately magnetized in the thickness direction of a plate magnet to form striped multipolar magnetic poles, which are then made into an elongated strip with a length L. It is a flexible magnet. The edge 4 of the multi-pole magnetic pole of the plate magnet 8 is tilted in the sliding direction (arrow direction) at an acute angle, for example, at an angle of θ=20°, at equal intervals of L sin θ,
arranged in parallel. The rear end portion of each plate-shaped magnet 8 in the sliding direction is removed from the corner parallel to the sliding direction, leaving θ, to form a notch line 8a. Note that the angle θ of the remaining portion of the notch line 8a of the plate magnet 8 may be smaller than 20°.

As shown in FIG. 5, the device 5 for changing the ground color of a magnetic sheet is constructed by adhering a plate magnet 8 to the front surface of a magnet mount 7. A sliding guide 6 is placed on the magnetic sheet 1, and the converting device 5 is slid along it. In FIG. 5, 1a is a board stand. The magnet mount 7 has a plate-like magnet 8 whose multi-pole edge 4 has an inclination of, for example, 65° (acute angle of 25° with respect to the sliding direction) with respect to the side 5a of the converter 5. (Figures 1 to 4)
figure). The sliding guide 6 maintains the inclination of the edge 4 of the multipolar magnetic poles of the plate magnet 8 so that it can slide (FIG. 5).

Next, the method of the present invention will be explained.

This is achieved by sliding the converting device 5 over the surface of the magnetic sheet in the right direction in FIG. 1b. That is,
When the magnet mount 7 to which the above-mentioned plate magnet 8 is adhered is slid in the direction of arrow R and magnetic force is applied,
As shown in the figure, magnetic sheet 1 is coated with metallic luster color M.
A pattern with black B lines is formed at intervals of L sin θ, and the magnetic sheet 1 is transformed into a metallic luster color M. This phenomenon of the black B line is caused by the end effect of the magnetic pole at the notch line 8a of the plate magnet 8.

FIG. 2 shows a second embodiment.

In this embodiment, plate magnets 8 are arranged on the surface of a magnet mount 7 in a zigzag pattern in the vertical direction in the drawing. The rear end portions of each plate-shaped magnet 8 are connected by contacting the notch lines 8a which are removed from the corners leaving θ in parallel to the sliding direction. A gap of 0.1 to 0.2 mm is provided at the front contact portion of the plate magnet 8 in the sliding direction.
Similarly to the first embodiment, the device 5 for changing the ground color of the magnetic sheet includes a plate magnet 8 as shown in FIG.
is adhered to the surface of the magnet mount 7.

According to this embodiment, as shown in FIG. 2a, the magnetic sheet 1 has a pattern of metallic luster color M with black lines B at intervals of 2Lsinθ, and most of the magnetic sheet 1 has metallic luster color M. will be converted. In this embodiment, the black B line is not generated at the point where the corner of the front plate-shaped magnet 8 in the sliding direction is in contact with the corner at a gap of 0.1 to 0.2 mm.

FIG. 3 shows a third embodiment.

This embodiment differs from the first embodiment in the shape of the plate-shaped magnet 8, and the corners of both ends of the plate-shaped magnet 8 have parallel notch lines 8a. Therefore, the magnetic sheet 1 can be changed to the metallic luster color M by sliding it in both left and right directions in the figure and applying magnetic force. Other points are
This is the same as the first embodiment.

FIG. 4 shows a fourth embodiment.

In this embodiment, a wide plate magnet 9 having a different shape from that in the first embodiment is used. This plate magnet 9
The S and N poles of each elongated strip are alternately magnetized and arranged, and are formed in a sawtooth shape with a plurality of angles of 2θ with the apex facing in the sliding direction. Then, a circular punched part 9a with a diameter of 0.4 to 0.6 mm is provided in the trough at the root of the sawtooth, and between the magnets in the trough.
A gap of 0.1 to 0.2 mm is provided to weaken the magnetic force so that black lines do not form in these valleys.

Further, other points such as the angles of the tooth tips and tooth roots are the same as in the first embodiment.

In the above embodiment, an example was explained in which the inclination of the edge of the multipolar magnetic pole is θ = 20° with respect to the sliding direction, but if the inclination is 45° or more, the influence of the magnetic pole tip becomes large and the black width becomes wider. If the inclination is less than 5°, the converting device must be made larger, which is not appropriate, and an inclination of about 16° is preferable.
Further, in the above embodiment, the converting device 5 is an example in which the plate magnet 8 is attached to the magnet mount 7, but the conversion device 5 can also be converted by attaching the plate magnet 8 etc. to a hard plate etc. with the surface flattened. It may also be the device 5. or,
It is preferable from the viewpoint of the end effect of the magnetic poles that the plate magnet is formed into a desired shape after being magnetized into striped multi-pole magnetic poles.
In addition, the present invention is not limited to the above embodiments, such as magnetic sheets, plate magnets, magnet mounts, etc. It goes without saying that those skilled in the art can make various changes and modifications without departing from the present invention.

〔effect〕

As explained above, according to the present invention, a wide magnetic sheet can be colored with metallic luster by using a simple striped multi-pole plate magnet without the need for large-scale equipment or equipment unlike conventional methods. can be converted.

In addition, since characters, lines, etc. can be written in black on a metallic luster-colored background, the contrast can be strengthened, the written characters, lines, etc. can be clearly identified from a distance, and it can be used in the same way as a blackboard or whiteboard. Furthermore,
Since writing and erasing are carried out magnetically, it is possible to create a dust-free board that does not contain chalk powder like a blackboard or ink powder like a whiteboard. Furthermore, it can be used as an all-weather board that can be used in the rain and underwater.

[Brief explanation of drawings]

1 to 4 are plan views showing embodiments of the present invention, FIG. 5 is a perspective view illustrating the operation of the device for changing the ground color of a magnetic sheet, and FIG. 6 is a sectional view showing the structure of the magnetic sheet. , FIG. 7 is a plan view illustrating the change of the ground color of the magnetic sheet. 1...Magnetic sheet, 3...Substrate, 4...Edge,
5... Conversion device, 6... Sliding guide, 7... Magnet mount, 8, 9... Plate magnet, 10... Microcapsule, 12... Magnetic piece.

Claims (1)

[Claims] 1. A colored liquid and magnetic flakes with a metallic luster suspended in the colored liquid are enclosed in a transparent microcapsule, and a magnetic layer is formed by densely coating the microcapsules in multiple layers, a transparent film, and a substrate. By forming a sheet, applying a magnetic force from the front or back surface of the magnetic sheet, and changing the orientation direction of the magnetic pieces, the ground color of the magnetic sheet is converted to a metallic luster color that is exhibited by light reflected by the magnetic pieces. In the method for converting a magnetic sheet to a metallic luster color, N
A striped multi-pole plate magnet is magnetized with a large number of alternating poles and S poles, and the edges of the multi-pole magnetic poles of the plate magnet are held at an acute angle with respect to the sliding direction. A method for converting a magnetic sheet to a metallic luster color, comprising changing the ground color of the magnetic sheet by sliding the top or bottom surface of the sheet.