JPS60173722A - Magnetic card - Google Patents

Abstract

PURPOSE:To prevent the forgery and illicit use of the titled magnetic card by forming locally a substance for shielding the infrared light on a substrate, and allowing the part on which the substance for shielding the infrared light is formed and the part (window) on which said substance is not formed to show the same characteristic to the visible light. CONSTITUTION:A magnetic film 2 consisting of Fe2O4 is formed on a substrate 1 having high transmissivity to the infrared light. A window 2a is perforated at a part of the magnetic film 2. The number, size, intervals, etc. of the windows are appropriately combined to constitute a certain code. A masking 3 is formed on the magnetic film 2. The masking is formed of the material such as paper which is transparent to the infrared light and shields the visible light. Accordingly, the window equipped to the magnetic film 2 can not be recognized by eyesight. The masking 3 is not applied to the whole surface, and the part which is not masked is provided in the form of a sash. The magnetic film is exposed at said sash-shaped part, and the reading and writing of informations are carried out with a magnetic head such as a card reader at this part.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to generally used magnetic cards such as credit cards, cash cards, and identification cards.

Conventional structure and its problems Measures to prevent counterfeiting of magnetic cards currently in use include:
Visually visible information such as a facial photo, handwritten signature, stamped seal, and embossed text has been added.

However, as the practical use of magnetic cards in the form of cash vouchers, such as telephone cards, progresses, it will no longer be possible to attach the above-mentioned facial photographs to each cash voucher card. Therefore, this type of coupon is a counterfeit.

It seems that abuse will increase.

OBJECTS OF THE INVENTION The present invention takes into account the above-mentioned conventional problems and provides a magnetic card that can prevent counterfeiting and misuse of the magnetic card.

Structure of the Invention The magnetic card of the present invention includes a substrate that is transparent to infrared light, on which a substance that blocks infrared light is partially formed, and further includes parts that are coated with the substance that blocks infrared light and parts that are not coated with the substance that blocks infrared light. The above object is achieved by irradiating this magnetic card with infrared light and detecting the transmitted light with a detector.

DESCRIPTION OF EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. 1st
In Figures 1 and 2, 1 is a substrate made of polyester film, paper, etc. If the thickness of the substrate made of these materials is 0.2rmn or less, the transmittance of infrared light is very high. It is. On this substrate 1, F e 2
A magnetic film 2 made of 0.03 is formed. This magnetic film 2 has a window 2a formed in a part thereof, and a code is constructed by suitably combining the number, size, and interval of the windows. As is well known, Fe2o3 has the property of blocking most infrared light. Furthermore, a masking 3 is formed on this magnetic film 2. This masking material is made of a material (for example, paper) that is transparent to infrared light and shields from visible light. Therefore, the window provided in the magnetic film 2 is not visible. Also, the masking 3 is not applied to the entire area, but a band-like portion is provided that is not masked. The magnetic film is exposed in this strip-shaped portion, and information is read and retrieved in this portion by a magnetic head (not shown) such as a card reader.

When the magnetic card configured as described above is used in a card reader, for example, the magnetic card is irradiated with infrared light in the card reader, and the infrared light transmitted through the window 2a is detected by a detection element such as a photointerragator. It then detects the size of the window, the number 1 interval, etc., and determines whether the magnetic card used is a genuine one.

In this example, the three-layer structure of the substrate, magnetic film, and masking was used, but any means may be used as long as the window provided in the part that blocks infrared light cannot be seen.
The following may be considered: If a window formed on a black substrate that blocks infrared light is filled with a substance that blocks visible light but transmits infrared light, such as germanium, masking may not be necessary. It is possible to make it impossible to see the window.

In addition, in this example, Fe2 is used as a substance that blocks infrared light.
Although O3 was used, it can also be formed by vapor deposition of AI or the like. However, in this case, it goes without saying that a magnetic stripe section for reading information must be formed separately.

Details of the invention As explained above, the magnetic card of the present invention is made of paper.

A substance that blocks infrared light is partially formed on a substrate such as a polyester film, and the areas where the substance that blocks infrared light is formed and the areas (windows) where it is not exposed to visible light. Since the magnetic cards are configured to have the same characteristics, and codes are configured for the number of windows, the size of the windows, 9 intervals, etc., it is difficult to forge or misuse the magnetic cards.

[Brief explanation of drawings]

FIG. 1 is a perspective view of a magnetic card according to an embodiment of the present invention, and FIG. 2 is a sectional view taken along line A-A in FIG. 1...Substrate, 2...Magnetic film (substance that blocks infrared light), 2a...Window, 3...
Name of masking layer/agent: Patent attorney Toshio Nakao and one other person Figure 1? L? αl

Claims (1)

[Claims] A substance that blocks infrared light is partially formed on a substrate that is transparent to infrared light, and the parts where the substance that blocks infrared light is formed and the parts where it is not formed are made to be transparent to visible light. A magnetic card with the same characteristics.