JPH0754580B2 - Magnetic fluid sealed card - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to a magnetic fluid card.

In recent years, cards recording various kinds of information such as ID cards, cash cards, and bank cards have become widespread, and a magnetic card is one of such cards.

The magnetic card has a magnetic recording layer on the card, that is, on the front surface or the back surface of the card, and various information is magnetically recorded on the magnetic recording layer.

Although the contents of this magnetic recording are invisible to human eyes, of the contents of the magnetic recording, the contents of the magnetic recording are visible to the card holder himself, such as the remaining number of times on a telephone card. It may be desired to display in.

[Prior Art] As a method of visually displaying such magnetic recording contents, for example, in the case of a telephone card, such magnetic recording contents are displayed by punching holes in the card or an electric signal is displayed. Instead of this, it is being displayed visually on the CRT of the card-using device.

[Problems to be Solved by the Invention] However, of these methods, in the former case, only a very rough display can be performed, and in the latter case, the device is large and cannot be displayed on the card. It is impossible to always check the contents. For this reason, it is desired to develop a technique that enables at least a part of the contents of the magnetic recording to be visually and clearly displayed on the card by using the magnetic recording itself.

The present invention has been made in view of the above circumstances, and provides a card capable of visually displaying on the card at least a part of the contents of the magnetic recording on the card by using the magnetic recording itself. It is intended to be provided.

[Means for Solving the Problems] To this end, the magnetic fluid sealed card of the present invention has a layer of a magnetic recording medium provided on a card substrate, and the magnetic recording medium is provided on the surface of the card substrate. It is characterized in that a layer of magnetic fluid encapsulating microcapsules is provided in the magnetic field of the layer of the recording medium.

[Operation] The magnetic powder in the magnetic fluid is inverted by being affected by the magnetic flux of the magnetic recording layer, and the magnetic fluid layer visually displays the contents of the magnetic recording of the magnetic recording layer.

[Embodiment] Hereinafter, details of the present invention will be described with reference to the drawings illustrating an embodiment.

In FIGS. 1 and 2, reference numeral 1 is a magnetic fluid sealed card, and the magnetic fluid sealed card 1 has a substrate 2. Board 2
Is for giving strength to the card and is made of, for example, vinyl chloride, and its thickness is selected within a range in which a magnetic shield effect is not produced against a magnetic field of the magnetic recording layer 3 described later.

A magnetic recording layer 3 is formed on the back surface of the substrate 2.

On the other hand, a magnetic fluid layer 5 containing a magnetic fluid 4 is formed on the surface of the substrate 2. The magnetic fluid layer 5 needs to be located in the magnetic field that is formed when the magnetic recording layer 3 is magnetized, and therefore the magnetic fluid layer 5 and the magnetic recording layer 3 are placed on the substrate 2.
It is necessary to face each other across. Therefore, when the magnetic recording layer 3 is provided on the entire back surface of the substrate 2, the magnetic fluid layer 5 may be provided anywhere on the front surface of the substrate 2.
When the magnetic recording layer 3 is formed in a stripe shape,
The magnetic fluid layer 5 is provided at a position facing the stripe with the substrate 2 interposed therebetween.

As the magnetic fluid 4, fine magnet particles are dispersed in a dispersion liquid, and a commercially available magnetic fluid can be used as such a magnetic fluid.

When forming the magnetic fluid layer 5, what is particularly important is to distribute and hold the magnetic fluid 4 with a uniform thickness. For that purpose, in the magnetic fluid layer 5, the magnetic fluid 4
Is to suppress the flow of water as much as possible. As the magnetic fluid layer 5 capable of suppressing the flow of the magnetic fluid 4 as described above, the magnetic fluid is encapsulated in microcapsules having a diameter of several μm to several tens of μm, and this is made into ink by a known method and printed.
The printing may be performed on the surface of the substrate 2, or on the inner surface of the overlay 10 described below or on the upper surface of the magnetic recording layer 3.
Alternatively, as shown in FIGS. 3 and 4, a comb-shaped bank 6 is formed on the substrate 2 by screen printing or the like, and a transparent cover 7 is sealed on the bank 6, and the cell is hermetically sealed and communicates through a bottleneck. 8 is formed, and the magnetic fluid 4 encapsulated in microcapsules is filled and stored in the cell 8.

Alternatively, as illustrated in FIGS. 5 and 6, a closed bank 6a is formed on the substrate 2 by screen printing or the like, and a transparent cover 7a is sealed on the bank 6a to form a plurality of closed and independent cells 8a. The magnetic fluid 4 which has been formed and encapsulated in microcapsules is filled and stored in the cell 8a. When the cell 8a is filled with the magnetic fluid 4, an injection hole 11 and a deaeration hole 12 are formed in the cover 7a, and the deaeration hole 12 is deaerated and the injection hole 11 is removed.
The magnetic fluid 4 is injected from the inside, and after the injection, the injection hole 11 and the degassing hole.
12 is closed with stoppers 13 and 14.

As a method of forming the banks 6 and 6a in the above embodiment,
Although a method using screen printing has been described as an example, the present invention is not limited to this, and all known techniques such as the use of a frame material and the application of a molding technique can be used.

The magnetic fluid layer 5 is a transparent overlay 10 that covers the entire surface of the card.
Is covered by.

FIG. 7 shows a magnetic fluid sealed card 1a according to another embodiment of the present invention. The magnetic fluid sealed card 1a is a substrate 2
The magnetic recording layer 3 is formed on the surface of the magnetic recording layer 3.
A magnetic fluid layer 5 is formed on top of the magnetic field. The magnetic fluid layer 5 is covered by a transparent overlay 10 which covers the entire surface of the card.

In this case, in order to obtain a contrast with the magnetic fluid in order to form a visible display on the magnetic fluid layer 5, a coating layer having a hue / tone different from brown or black, which is the unique color of the magnetic material, is provided on the magnetic recording layer 3. It is preferable to provide a printing layer of a white pigment such as clay or titanium white.

In the magnetic fluid sealed card 1 configured in this way,
If the magnetic recording layer 3 is magnetized and a recording is written or the recording is rewritten, since the magnetic fluid layer 5 is in the magnetic field of the magnetic recording layer 3, the minute magnets in the magnetic fluid 4 act on the magnetic moment. 180 ° and a half turn, and as a result,
The light reflectance of the magnetic fluid layer 5 changes, the coloration changes, or the transparent portion changes to opaque, whereby the recorded contents of the magnetic recording layer 3 are visually displayed on the magnetic fluid layer 5.

[Effects of the Invention] As described above, according to the magnetic fluid sealed card of the present invention,
At least a part of the contents of the magnetic recording on the card can be visually displayed on the card using the magnetic recording itself.

Therefore, even for a telephone card, for example, the cardholder can know the remaining number of times at any time and place without the need for a magnetic reader attached to the telephone.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective explanatory view of a magnetic fluid sealed card, FIG. 2 is a vertical sectional explanatory view of a II-II portion in FIG. 1, FIG. 3 is a vertical sectional explanatory view of a magnetic fluid layer, FIG. 4 is an explanatory plan view of the magnetic fluid layer,
5 is a vertical cross-sectional explanatory view of another magnetic fluid layer, FIG. 6 is a plan explanatory view of another magnetic fluid layer, and FIG. 7 is a vertical cross-sectional explanatory view of another magnetic fluid-sealed card. 1 ... Magnetic fluid enclosed card, 2 ... Substrate, 3 ... Magnetic recording layer, 4 ... Magnetic fluid 5 ... Magnetic fluid layer, 6,6a ... Bank, 7,7a ... Cover, 8,
8a …… cell 10 …… overlay, 11 …… injection hole, 12 …… degassing hole, 1
3,14 ... Stopper

Claims (1)

[Claims] 1. A layer of a magnetic recording medium is provided on a card substrate,
A magnetic fluid enclosed card characterized in that a magnetic fluid layer encapsulating microcapsules is provided on the surface of the card substrate in the magnetic field of the layer of the magnetic recording medium.