JPS5917682A - Information card - Google Patents

Abstract

PURPOSE:To prevent encoded information from leakage, by arranging a substance colored in the same degree as a fluorescent substance on an area free from the flurescent substance in an information card to use the fluorescent substance as an information signal. CONSTITUTION:Bonding agents 1a, 2a are applied to the inside of Japanese paper 1, 2 and a fluorescent substance 5 and a substance 6 having light transmittivity almost equal to that of the fluorescent substance 5 are adhered like sandwich. For the substance 6, a pigment or dye having a color similar to the ink component of the fluorescent substance 5 is used. The paper 1, 2 are adhered by bonding agents 3a, 4a coated on the insides of laminated films 3, 4 made of a material transmitting light. As the information of the phosphor, two upper and lower information tracks are arranged by an optional encoding method and center part is clock signals 7. When exciting infrared rays havig wavelength lambdaa are sequentially irradited from one side of the card, transmitted light B having both the components of th wavelength lambdaa and exciting wavelength lambdab appears at the portions existing the fluorescent substance 5 and light with wavelength lambdaa is transmitted in other areas.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an information card used in an information processing device that optically reads information using a phosphor as an information signal.

When a certain kind of phosphor is irradiated with infrared light of wavelength λa to excite it, it emits infrared light of wavelength λb, which is longer than λa. This is known as Stokes shift. A method has been proposed in which a width is printed on paper, irradiated with infrared rays having the wavelength λa, and only the excited wavelength λb is extracted and processed as a signal.

(1) The present invention proposes an information card necessary for realizing the above information processing method.

In this information processing method, the present inventor has particularly proposed that the excitation light source and the detection element be arranged opposite to each other on both sides of the information card, in other words, by using a transmission method, the light energy can be used effectively and the device can be made compact. We are developing ways to achieve this goal.

Generally speaking, an information card can be considered in which a phosphor is applied to the signal area on the card and nothing is present in the non-signal area, but the phosphor is mixed into the ink. In order to take advantage of the above-mentioned advantages of the transmission method, the information card itself has to be as thin as possible, so the placement of the phosphor can be seen through the naked eye. The problem arises that it can be done.

The present invention has been made in view of the above points, and an object of the present invention is to improve the confidentiality of information by arranging the light transmittance regardless of the position of the phosphor.

(2) Therefore, in the present invention, a material having the same coloring as the phosphor is arranged in an area where the phosphor does not exist, so that the encoded information cannot be read.

Embodiments of the present invention will be described below with reference to the accompanying drawings. FIG. 1 is a plan view showing a part of the information card of the present invention in cross section, and FIG. 2 is an enlarged sectional view taken along the line A-A.

In these drawings, reference numerals 1.2 are paper sheets made of Japanese paper, and adhesive 1.2 is applied to their inner surfaces. A, 2a are coated, and a phosphor 5 and a substance 6 having the same light transmittance as the phosphor are bonded and sandwiched in a sandwich-like manner. In addition,
In this case, the adhesive may be applied to only one of the sheets. As the fluorescent material 5, for example, Japanese Patent Publication No. 51-2
The ink composition shown in Japanese Patent No. 2326 is used, and as the substance 6, a pigment or dye having the same coloring as that of the ink composition can be used. In addition, when the pigment or dye in the ink composition is colorless, the color of the phosphor itself,
For example, since the color of the ink composition of (3) is determined by light blue (light blue), the color of substance 6 is also light blue. These phosphors 5 and substances 6 of the same color are applied by coating onto the paper 1.2.

3.4 is a laminate film made of a material that transmits light, such as polyester resin, and the inner surface is coated with adhesive 3.
A and 4a are coated, and the paper 1.2 is wrapped in a bag and adhered.

In the example of FIG. 1, the information tracks in which phosphor information is arranged according to an arbitrary encoding method are arranged in two rows, one above the other, and the clock signal 7 is located in the center of both. The clock signal may, for example, use similar phosphor information, or may be a punched hole, as long as it can be detected by any detector.

When the information card configured as described above is inserted into an information reading device (not shown), excitation infrared rays with a wavelength λa are sequentially irradiated from one side of the information card along the reading direction of the card. In the area where the substance 5 is present, a transmitted light ray B having the same component as the excitation wavelength λb of the phosphor appears, and in other areas (4), including the area where the substance 6 is present, is simply a transmitted light ray with the wavelength λa. only appears. The detection element (not shown) has a wavelength λ
Due to the action of the filter that cuts the infrared rays of a, the wavelength λb
In response to only the light beam, the light beam is photo-electrically converted and code information formed by the phosphor information is read.

By the way, even if this information card is viewed through, the phosphor 5 and the substance 6 are colored to the same degree, so they cannot be distinguished and the information content will not be easily known. Note that since the information card shown in this embodiment has a structure in which the phosphor 5 and substance 6 are bonded together, even if an attempt is made to peel off the paper 1.2, the phosphor 5 and substance 6 will also be peeled off together.

Note that it is preferable that the light transmittance of the substance 6 for normal visible light is set to be about the same as that of the fluorescent material.

As described above, according to the present invention, the confidentiality of phosphor information is ensured, which is an excellent effect.

[Brief explanation of drawings]

FIG. 1 is a plan view (5) showing a part of the information card of the present invention in cross section, and FIG. 2 is an enlarged sectional view taken along the line A-A. ■, 2...Paper, la, 2a...Adhesive, 5...
Fluorescent material 6: A substance colored similarly to the fluorescent material 5. Representative Patent Attorney Takashi Okabe (6)

Claims (1)

[Claims] An information card having, as a coded information medium, a phosphor that emits infrared rays of another specific wavelength when excited with infrared rays of a specific wavelength, and a similar phosphor as this phosphor is provided in an area where this phosphor information medium does not exist. An information card that carries a colored substance.