JPH07120382B2 - Identification structure of information storage card - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] <Industrial field of application> The present invention is intended to counterfeit information storage cards such as magnetic cards, IC cards, and optical cards that exchange information with a reader / writer. The present invention relates to an identification structure of an information storage card for identifying with a reader / writer to prevent the above.

<Prior Art> Conventionally, for example, in order to prevent forgery of a magnetic card, a magnetic layer has a multilayer structure, a bar code is provided on the surface of the card, and a magnetic card that is not reused, Methods such as punching holes on the magnetic recording surface when they are no longer needed have been implemented.

However, in each of the above methods, there is a problem that the forgery side can relatively easily analyze the structure and forgery the card at a relatively low cost. In addition to the above methods, it is possible to complicate the identification structure provided in the card and the reader / writer, but the manufacturing cost rises,
Moreover, there is a problem that the reader / writer becomes complicated and becomes large in size.

On the other hand, in Japanese Patent Publication No. 53-1131, a card is provided with a hologram in which a hologram pattern is doubled around the entire axis of rotation, and the hologram is irradiated with a reference light to form an image. A structure is disclosed in which an image on the image plane is rotated around the rotation axis by a prism or the like, and an inner pattern and an outer pattern are received by a pair of light receiving elements and read. According to this, the identification is improved because it is difficult to analyze and forge the hologram, but the image must be rotated once every time the processing is performed, the identification processing time becomes long, and the ID card, the credit card Also, there is a problem that it is difficult to use in applications requiring high-speed processing such as a cash card.

<Problems to be Solved by the Invention> In view of the problems of the conventional technology as described above, the main object of the present invention is to improve the distinguishability between a legitimate card and a forged card and to irradiate the light emitted from directly above. The reflected light from the optical discriminator that has a reflection direction characteristic or a diffractive characteristic that reflects in a unique direction symmetrical about the axis is received in real time, and the optical discriminator is dirty by securing the amount of received light. An object of the present invention is to provide an identification structure of an information storage card capable of improving the reliability of identification processing in some cases.

[Structure of the Invention] <Means for Solving the Problems> According to the present invention, such an object is a characteristic of a reflection direction peculiar to reflecting light emitted from directly above in a symmetrical direction with respect to the optical axis thereof. A light projecting unit that projects light toward the optical identification unit on the card surface in order to identify whether or not the information storage card provided with the optical identification unit having the diffraction characteristic on the surface is a regular card. An identification structure of an information storage card, comprising: a light receiving unit that receives reflected light or diffracted light from the optical identification unit; and an identification unit that performs the identification based on the received light intensity of each portion of the light receiving unit, The light-receiving portion is integral with the light-emitting portion, surrounds the light-emitting portion over the entire circumference thereof, and has a plurality of portions that are separated from each other in the radial direction so as to separately receive light. The light receiving section is paired with each other with the light section as the center. Wherein with the received light intensity of each portion of the position the card is achieved by providing the identification structure of the information storage card, characterized in that identified as an authorized card.

<Operation> In this way, the reader / writer does not become complicated and large, and if the light cannot be received by the two symmetrical parts, it is not recognized as a legitimate card, and thus the distinguishability can be improved. In addition, the reflected light from the optical discriminating portion having a unique reflection direction characteristic of reflecting the light emitted from directly above in a symmetrical direction around the optical axis can be efficiently received in time, and the symmetrical light The light amount can be secured by receiving light at one portion, and the reliability of the identification process is improved when the optical identification portion is dirty.

<Embodiment> Hereinafter, a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is a first embodiment based on the present invention, and is a perspective view schematically showing a main structure in the magnetic card 1 and a card reader / writer.

The card 1 is driven in the direction of the arrow, that is, in the substantially left-right direction in FIG. 1 by a transport roller or the like (not shown), and at the position of the magnetic head 3, with respect to the magnetic stripe 2 provided on the main surface 1a of the card 1. Information is written / read out.

On the other hand, an identification portion 4 is provided at a position near the shoulder portion of the main surface 1a of the card 1. As shown in FIG. 2 and FIG. 3, the identification portion 4 is composed of a large number of parallel V-shaped grooves 6 extending in the direction of the imaginary line R from several lines / mm to several hundred lines / mm.

On the card reader / writer side, when the card 1 is in the position shown by the solid line in FIG.
On the other hand, a laser beam issuing element 9 is provided as a light projecting portion at a predetermined interval. Further, as well shown in FIG. 4, the light-receiving element 10 as a light-receiving portion composed of a multi-divided photodiode divided into a large number of portions 10a to 10h so as to surround the light-emitting element 9 over the entire circumference. It is provided so as to be integrated with 9. The light receiving unit 10 has a card 1
An identification circuit 11 is connected to identify whether the card is an authorized card.

In order to actually identify the card 1, the card 1 inserted in the card reader / writer is held at a position orthogonal to the light emitting element 9, and the light emitting element 9 irradiates the identifying section 4 with illumination light. Then, the light reflected by the identifying portion 4 extends in each of the portions 10a to 10h of the light receiving element 10 in a pattern as shown in FIG. 4, that is, in a direction orthogonal to the extending direction of each groove 6 (imaginary line R). The light is received as an elliptical pattern. Then, when the light is emitted to the identification portion of the regular card, the light receiving intensity becomes strong, and the light receiving intensity of the same portion (portions 10a and 10e in FIG. 4) that is the same as the symmetrical portion around the light emitting element 9 is the other portion. If it is higher than the predetermined value by more than a predetermined value, the card 1 is identified as an authorized card. Therefore, for example, even if the card 1 is obtained for the purpose of forging a card, it is not only difficult to analyze the groove pattern of the identification section, but also it requires a great cost to create a similar identification section. Therefore, the anti-counterfeiting effect is extremely high.

FIG. 5 shows a second embodiment according to the present invention. In the present embodiment, the spacing between a large number of grooves in the identification portion on the card 1 side or thousands of
The diffraction grating has a density of / mm, and is configured to collect light from the light emitting element 9 as spot light on the portions 10a and 10e, for example. The other configuration is the same as that of the first embodiment.

6 and 7 are views similar to FIGS. 2 and 4 showing a third embodiment according to the present invention. In the present embodiment, a first set 25 of a plurality of parallel V-shaped grooves 26 extending in the direction of the imaginary line S on the identifying portion 24 and a plurality of parallels extending in the direction of the imaginary line T different from the above direction. Second set consisting of various V-shaped grooves 28
Composed of 27. Therefore, the light radiated to the identification portion 24 is spread in the respective portions 10a to 10h of the light receiving element 10 in the direction orthogonal to the extending direction (imaginary lines S and T) of the grooves 26 and 28 as shown in FIG. Since the light is received as a pair of existing elliptical patterns, the card 1 is a normal card by detecting the positional relationship between the parts having high received light intensity (the parts 10a and 10e and the parts 10b and 10f in FIG. 4). Identify things. The other configuration is the same as that of the first embodiment.

8 to 11 show a fourth embodiment according to the present invention. According to this embodiment, a large number of portions 41a to 41h of the light receiving section 40 are provided.
Is provided so as to surround the light emitting element 39, and further, a second set 42 composed of a large number of portions 41a to 42h is arranged so as to surround these portions 41a to 41h. .
Therefore, not only can the identification patterns similar to those of the first and third embodiments shown in FIGS. 8 and 9 be recognized, but also the diffraction grating as shown in FIGS. The reflected spot light from the light receiving section 40 is focused on the portions 41a and 41e of the first set 41, or the portion 42a of the second set 42 on the outside thereof.
, 42e, etc.
It becomes possible to recognize, dramatically increase the variation of the identification pattern, and further improve the forgery difficulty, and for example, it is possible to store the individual information of the card on the card side in advance and read it. Become. The other configuration is the same as the first configuration.

Needless to say, the present invention is not limited to the above-described embodiment and can be applied in various ways. For example, the identification section may be provided on the back side of the card or may be formed by a hologram. Further, a plurality of identification portions having different groove patterns may be provided on the surface of the card to perform more advanced identification, or different identification portions may perform identification according to the usage state of the card. Further, in each of the above-described embodiments, the illumination light is directly emitted from the light emitting element to the identification portion, but a mirror, a prism or the like may be inserted in the optical path to change the optical path. Further, a positioning sensing device (PSD) or the like may be used as the light receiving element other than the photodiode. Furthermore, the irradiation light to the identification unit is not limited to the light of a specific wavelength, and may be white light, for example.

As described above, according to the present invention, in the card identification structure,
In order to identify an information storage card provided with a surface on which an optical identification section having a reflection direction characteristic or a diffraction characteristic that reflects light emitted from directly above in a unique direction symmetrical about the optical axis is provided, A light projecting unit that irradiates light toward the identification unit from directly above it, a light receiving unit that is integral with the light projecting unit, and has a plurality of portions that surrounds the entire circumference around the light projecting unit, and each of the light receiving units. The card has an identifying means for identifying the card as a regular card from the received light intensity of the portion, and the received light intensity of the symmetrical portions corresponding to the reflection direction characteristic of the regular optical identifying section in the light receiving section is different from the other. By identifying that the card is a legitimate card if both are higher than the part, the identification device can be made compact, and the positioning of the light emitting unit and the light receiving unit can be facilitated, and the identification can be further improved. Can and above The reflected light from the optical identification portion which has a reflecting direction characteristic as efficiently be received, in addition also possible to secure the amount of received light, it is good discrimination process even when the optical identification unit is dirty. From the above, the effect of the present invention is great.

[Brief description of drawings]

FIG. 1 is a perspective view of essential parts of a magnetic card and a card reader / writer showing a first embodiment according to the present invention. FIG. 2 is an enlarged plan view of an essential part of FIG. FIG. 3 is a partial sectional view taken along the line III-III in FIG. FIG. 4 is a view taken along the line IV-IV in FIG. FIG. 5 is a view similar to FIG. 4 showing a second embodiment according to the present invention. 6 and 7 are views similar to FIGS. 2 and 4 showing a third embodiment according to the present invention. 8 to 11 are views similar to FIG. 4 showing a fourth embodiment according to the present invention. 1 ... Card, 1a ... Main surface 2 ... Magnetic stripe, 3 ... Magnetic head 4 ... Identification part, 6 ... V-shaped groove 9 ... Light emitting element, 10 ... Light receiving element 10a to 10h ... Part , 11 …… Identification circuit 20 …… Light receiving element, 20a to 20h …… Part 24 …… Identification section, 25 …… First set 26 …… V-shaped groove, 27 …… Second set 28 …… V-shaped Groove, 39 ... Light emitting element 40 ... Light receiving element, 41 ... First set 41a to 41h ... Part, 42 ... Second set 42a to 42h ... Part

Claims (2)

[Claims] 1. An information storage card provided with an optical identification section having a unique reflection direction characteristic or diffractive characteristic for reflecting light emitted from directly above in a symmetrical direction with respect to the optical axis of the information storage card is normal. In order to identify whether it is a card,
The light projecting unit that projects light toward the optical identifying unit on the card surface, the light receiving unit that receives reflected light or diffracted light from the optical identifying unit, and the light receiving intensity of each part of the light receiving unit An identification structure of an information storage card having identification means for performing identification, wherein the light receiving section is integral with the light projecting section, surrounds the light projecting section over the entire circumference thereof, and can separately receive light. As described above, the card has a plurality of portions that are partitioned in the radial direction, and the card is identified as a legitimate card based on the light reception intensity of each portion that is symmetrical to each other with respect to the light projecting section. An identification structure of an information storage card characterized by the following. 2. The light receiving section comprises a first set of a plurality of portions surrounding the light projecting section and a plurality of sections surrounding the first set. The information storage card identification structure according to claim 1, further comprising: