JPS6213161Y2 - - Google Patents

Description

[Detailed explanation of the idea]

The present invention relates to an optical card that identifies the card by combining a plurality of data bits. In conventional optical cards, multiple data bits read by the reading sensor of an optical reader are arranged and the arrangement order is simply combined, so the combination can be easily changed by increasing or decreasing the number of data bits. However, there was a drawback that the optical card could easily be used illegally. In view of the above points, the present invention provides an optical card designed to eliminate such drawbacks.
Fraud prevention bits are added to the pattern in which the data bits are arranged, and the total number of data bits and fraud prevention bits is determined in advance so that the card cannot be used simply by increasing or decreasing the number of data bits. , which was an attempt to prevent fraudulent card use. Hereinafter, embodiments of the present invention will be described in detail based on the drawings. The figure is a plan view showing an embodiment of the optical card according to the present invention. The optical card of the embodiment shown in this figure is a card used in a mobile reading type optical reader, and has a clock bit CB added in addition to the data bit DB, but the present invention does not require the clock bit CB. Of course, the present invention can also be applied to a static reading type optical reading device. In the figure, BT indicates a fraud prevention bit.
The fraud prevention bits BT are added to the pattern in which the data bits DB are arranged, and the total number of data bits DB and fraud prevention bits BT is determined in advance. Note that the arrow indicates the advancing direction of the card. The optical card shown in this figure has the reading number "3", which will be described later, that is, it has 3 data bits DB, 5 fraud prevention bits BT, and the number of bits provided on the card is 8. The entire body is made of transparent synthetic resin, and the hatched area in the center is screen printed to indicate the data bit DB, clock bit CB, and fraud prevention bit BT. The corresponding portion is a transparent window that allows light to pass through without being blocked, so that it can be optically read by an optical sensor. Next, the arrangement and number of bits are explained in the table below.

[Table] Data bits used to identify cards
The maximum number of DBs is "8" in this example,
On the other hand, the maximum number of fraud prevention bits BT is "8", similar to the data bit DB. Then, the reading number is determined by combining the data bit DB arrays. For example, if the reading number is "1", there is no data bit DB array, and if it is "2", there is only one data bit DB on the left. The reading numbers "3", "4", etc. are determined by combining the arrays. Note that the combination of read numbers, that is, the card identification type, is determined by the maximum number of data bits DB, and in this embodiment, there are eight, so there are 2 ⁸ =256 combinations. Now, the fraud prevention bit that is a feature of this invention.
The BT arrangement is related to the data bit DB arrangement, and there are 8 pieces for the number ``1'' and 7 pieces for the number ``2'', as shown in the table below. Although it is arranged like this,
The total number of fraud prevention bits BT and data bits DB is determined to be "8" for all read numbers. In other words, if the total number of bits provided on the card is other than 8, there is a "read error".
becomes. As mentioned above, the card shown in the figure shows the case where the reading number is "3". The arrangement of the fraud prevention bits BT can be freely selected within the range of the total number of bits, and irregular arrangement is more effective in preventing fraud. As explained above, according to the present invention, fraud prevention bits are added in addition to conventional data bits,
Moreover, since the total number of bits for both is predetermined, you can simply change the arrangement of data bits,
It cannot be used simply by increasing or decreasing the number, and it is highly effective in preventing fraud.

[Brief explanation of the drawing]

The figure is a plan view showing an embodiment of the optical card according to the present invention. DB: Data bit, BT: Fraud prevention bit.

Claims (1)

[Scope of utility model registration request] In an optical card that identifies a card by combining a plurality of data bits, fraud prevention bits are added to the pattern in which the plurality of data bits are arranged, and the total number of data bits and fraud prevention bits is determined in advance. An optical card characterized by: