JPH08161445A - Issuing system for identifying medium and authenticating system for the same - Google Patents

Abstract

PURPOSE: To provide an issuing system for identifying medium and an authenticating system for the same with which a medium can be suitably authenticated without requiring any large space on the medium. CONSTITUTION: Fiber-shaped conductors 1a are embedded at random in a gift token 10. The issuing device of the gift certificate reads the distribution of conductors 1a while using a metal fiber distribution detecting sensor, the distribution of the conductors 1a synchronized with bars 16 for timing are quantized and normalized, a dot pattern corresponding to this normalized information is set by a dot setting part, the set dot pattern is printed onto a distribution display part 14 by a printing part, and the gift certificate 10 is issued. Concerning the issued gift certificate 10, the distribution of the conductors 1a is detected, the detected information is quantized, the normalized information and the dot pattern printed on the distribution display part 14 of the gift certificate 10 are read by a photodetecting means and the information read by the photodetecting means is compared with the quantized and normalized information so that the authenticity of the medium can be decided.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of issuing an identification medium in which fibrous conductors are irregularly scattered and an authentication method thereof.

[0002]

2. Description of the Related Art Conventionally, as a method of issuing (issuing a ticket) an identification medium such as a card and securities and a method of confirming its validity, a method using magnetic recording is well known. According to this conventional method of issuing a ticket and confirming the validity of the card, for example, the information such as the personal identification number is recorded in the magnetic recording unit, and the card is issued. When the card is inserted into the reading device and the personal identification number is input, the reading device reads the personal identification number recorded in the magnetic recording unit and confirms the validity of the card by collating it with the input information.

However, such a device for reading magnetically recorded information is commercially available, and is easily available, and the magnetically recorded information can be easily rewritten. However, there is a problem in security because the card can be easily forged and falsified.

Therefore, a method using microwaves has been proposed as a method of making counterfeiting and falsification of a card difficult and enhancing security. According to this method, FIG.
As shown in FIG. 6, the card 1 is embedded with irregularly scattered fibrous conductors 1 a of metal or the like.

Since the fibrous conductors 1a are randomly distributed in the process of manufacturing the card 1, the card 1 having a different pattern for each card can be obtained.

[0006] Such a card 1 is irradiated with microwaves and scanned, and the reflected wave or transmitted wave is measured and the conductor 1 is measured.
The pattern a is detected. Then, the detected pattern of the conductor 1a is digitized by an A / D converter (not shown) and is recorded in, for example, a magnetic recording section (not shown) provided in the card 1 so that the card 1 can be used (in the card Issue).

The information recorded on the magnetic recording portion (the digitized pattern of the conductor 1a) and the card 1 again.
The legitimacy of the card 1 can be confirmed by comparing the pattern of the conductor 1a detected by irradiating with microwaves with the information digitized by an A / D converter (not shown).

Therefore, the fibrous conductor 1a has a subtle difference for each card, and it is almost impossible to reproduce this difference, and forgery and tampering are extremely difficult.

[0009]

However, the method using microwaves as described above requires a microwave transmission device and a detection device, which complicates the device for authentication and makes it difficult to irradiate. There is also a problem that the generated microwaves propagate to the outside, which affects other devices and causes malfunction.

In order to solve these problems, it was necessary to develop a dedicated IC in order to simplify the device or shield the device itself in order to prevent the propagation of microwaves.

The applicant of the present invention has proposed a method for solving the above problems, and as a verification method capable of verifying the legitimacy of a card using a simple device that does not leak microwaves, the distribution of the conductors of the card. Japanese Patent Application No. 168650/1993 proposes a method of detecting a change in the electric field that occurs according to the above.

However, even when the method proposed by the applicant of the present invention for detecting the change in the electric field caused by the distribution of the conductor is used, the change in the electric field caused by the detected distribution of the conductor is A / D. It is converted (not shown), digitized and recorded in a magnetic recording unit (not shown) by a magnetic head (not shown). Next, the change in the electric field caused by the distribution of the conductor is detected again, and A / D conversion (not shown) is performed.
After that, the legitimacy of the card was authenticated by reading the digitized information and the information previously recorded in the magnetic recording unit (not shown) with a magnetic head (not shown) and comparing them.

For this reason, it is necessary to provide a device for writing and reading information in the magnetic recording unit in the authentication device, and the transport system is also accurate in order to accurately read and write information in the magnetic recording unit. A high transport system was needed.

According to the present invention, the change of the electric field caused by the distribution of the conductor is detected, and the corresponding data is recorded on the identification medium so that the data can be detected optically. And a method of issuing an identification medium capable of quickly and accurately performing the operation) with a device having a simple structure, and easily and accurately recording and reading information corresponding to the distribution of conductors. The purpose is to provide an authentication method.

[0015]

According to the present invention, there is provided a method of issuing an identification medium comprising an identification medium in which fibrous conductors are randomly scattered and a device for issuing the identification medium. The device for performing the electric field detection means detects an electric field change generated according to the distribution of conductors of the identification medium, and an electric field detection means for each predetermined level based on the maximum value and the minimum value of the electric field detected by the electric field detection means. Level dividing means for dividing the value of the electric field divided by the level dividing means into an optical reflection amount converting means, and an optical reflection amount converted by the optical reflection amount converting means for optical reflection of the identification medium. The identification medium is ticketed by means of recording information in an area for displaying information according to the amount.

Further, according to the present invention, there is provided an identification medium authentication method comprising an identification medium in which fibrous conductors are randomly scattered and an authentication device for confirming the validity of the identification medium. Has an area for displaying information by the amount of optical reflection, and the authentication device has an electric field detecting means for detecting a change in the electric field generated according to the distribution of conductors of the identification medium, and an optical device for detecting the amount of optical reflection of the area. The authentication device has a detection means and detects the distribution of the conductor and the optical reflection amount of the region and compares them to confirm the validity of the identification medium.

Furthermore, according to the invention, the authentication device comprises a first electrode arranged on one side of the identification medium and connected to an AC power supply, and a second electrode arranged on the other side of the identification medium. The electric field detection means is connected to the second electrode, and an electric field generated by a voltage applied to the first electrode based on an alternating current from an alternating current power source passes through the identification medium, whereby a conductor of the identification medium is formed. Is detected by detecting a change occurring in the second electrode in accordance with the distribution of.

[0018]

Embodiments of the present invention will now be described in detail with reference to the drawings.

FIGS. 1 (a) and 1 (b) show an embodiment in which the identification medium used in the identification medium ticket issuing system and the authentication system according to the present invention is applied to a gift certificate.
1A shows the surface of the gift certificate 10, and FIG. 1B shows the gift certificate 10.
16A and 16B, the conductor 1a is embedded in the gift certificate 10 as in the card 1 shown in FIG.

As the material for the gift certificate 10, high-quality paper can be used, but a resin material such as synthetic paper can also be used.

The conductor 1a preferably has a fibrous shape, but a scale-like shape can also be used in the present invention.

The conductor 1a may be made of a material and a distribution state in which a change in the electric field can be sufficiently caused by its distribution. As such a material, for example, room temperature (20 ° C.) volume resistivity (ρ ) Is 1 × 10 ^{−8 to} 100 ×
Metals in the range of 10 ^-8 Ωm (Sn, Bi, Se, Te, Z
n, In, Al, Pb, Fe, Co, Ni, Cr, C
A simple substance such as u, Ti, Ag, or Au or an alloy in which these are arbitrarily combined can be used.

The use of the material forming the conductor 1a is desirable because the waveform of the waveform detected by the sensor head 224 becomes sharp and has a sufficient change to identify the gift certificate 10.

Although the conductors 1a are shown on a part of the gift certificate 10 in the figure, they are randomly distributed on the entire surface of the gift certificate 10.

On the surface of the gift certificate 10 shown in FIG. 1 (a),
The printing 12 such as predetermined characters and figures similar to those of a normal gift certificate is provided. A distribution display portion 14 representing the distribution of the conductor 1a, which is a feature of the present invention, is provided on the back surface of the gift certificate 10 shown in FIG. 1B, and a timing bar 16 is provided adjacent to the distribution display portion 14. Has been. The distribution display unit 14
Conductor 1 for a given track 18 as shown in FIG.
The distribution of a is read, and the data corresponding to this read distribution is displayed. As shown in FIG. 3 and FIG. 4 which is a partial enlargement of FIG. 3, the distribution display portion 14 represents the distribution of the conductor 1a by the density represented by the halftone dots in this embodiment, and as described later, The data read about the distribution of the body 1a is divided into, for example, 10 steps, and the density of halftone dots is set according to the step. Timing bar 16
Is a bar for displaying the distribution of the conductor 1a and the timing when the distribution display unit 14 is read.

This timing bar 16 is made up of the conductor 1a.
The timing for optically detecting the distribution display portion 14 representing the distribution of the gift certificate 1 is taken. However, due to the size of the halftone dots formed on the distribution display portion 14 of the gift certificate 10 and the like, the gift certificate 1
The timing bar 16 may be omitted when the halftone dots formed on the distribution display portion 14 can be sufficiently discriminated and read by just passing 0 between the sensor heads 222 and 224 by hand.

Then, the bar code 20 is further printed on the back surface of the gift certificate if necessary.

FIG. 5 shows an embodiment of the gift certificate issuing apparatus of FIG. 1 as an example of the gift certificate issuing apparatus used in the identification medium ticket issuing method according to the present invention. As shown in the figure, the gift certificate issuing device includes a metal fiber distribution detection sensor 2
2. It has a timing bar detection sensor 24 and a medium position detection sensor 26. The metal fiber distribution detection sensor 22 is
This is a sensor that detects the distribution of the conductor 1a along the track 18 in FIG. 2, and detects a change in the electric field according to the distribution of the conductor 1a.

FIG. 6 shows the structure of the metal fiber distribution detecting sensor 22. The metal fiber distribution detection sensor 22 is
Sensor heads 222 (first electrode) and 224 (second electrode)
Electrodes). These heads 222, 224
It is arranged on both sides of the gift certificate 10 with a predetermined distance from the gift certificate 10. An AC power supply 226 is connected to the head 222.

The metal fiber distribution detecting sensor 22 also has grounded copper foils 228 and 230 on both sides of the gift certificate 10. The copper foils 228, 230 are formed on the acrylic plates 232, 234 on both sides of the gift certificate 10 as shown in FIG. 1 according to the size and shape of the gift certificate 10, and as shown in FIG. The heads 222 and 224 are arranged in the holes 236 and 238 provided in the head, respectively.

Each of the sensor heads 222 and 224 is a rod-shaped metal having a diameter of 3.5 mm and has a pointed tip, and a non-conductive portion having a diameter of 6 mm is formed around the sensor heads by holes 236 and 238 provided in the copper foils 228 and 230. , Copper foil 2 on the outside
The conductive parts 28 and 230 are formed to be insulated.

A constant AC voltage generated from an AC power source 226 is applied to the sensor head 222, and an electric field is generated in the sensor head 222. Then, as described later, the electric field passing through the gift certificate 10 is applied to the sensor head 22.
It occurs in 4.

At this time, the conductor 1a is included in the gift certificate 10.
The electric field cannot pass where the electric field 1a is distributed, and the electric field can pass where the electric conductor 1a is not distributed.
The distribution of the conductor 1a of 0 can be read.

The frequency of the AC power source 226 is 100 kHz.
It is desirable to set in the range of 100 MHz to 100 MHz, and particularly in the range of 1 MHz to 50 MHz, the output is suitable for collation because the uneven shape of the detected output waveform is sharp, depending on the distribution state of the fibrous conductor 1a. Waveforms can be obtained.

As shown in FIG. 6, the gift certificate 10 is arranged between the sensor heads 222 and 224.
The electric field generated from 2 appears in the sensor head 224 according to the distribution of the conductor 1a in the gift certificate 10 moving between the heads 222 and 224.

By measuring the change of the electric field appearing in the sensor head 224, the distribution of the conductor 1a on the track 18 in the gift certificate 10 can be detected. The electric field is measured by, for example, the track 18 set on the gift certificate 10 passing between the sensor heads 222 and 224.
This is done by passing 0 in the longitudinal direction.

The detected output waveform (signal) is, for example,
An output waveform as shown in FIG. 9 is obtained.

When the gift certificate 10 is passed between the sensor heads 222 and 224, the electric field applied from the sensor head 222 side is distributed in the gift certificate 10 and the conductor 1a.
The electric field is cut off in the area of 1) and does not pass to the sensor head 224 side, and the electric field passes to the sensor head 224 side in the area where there is no distribution of the conductor 1a, and the distribution of the conductor 1a unique to the gift certificate 10 is detected. To be done.

An amplifier 240 is connected to the sensor head 224. The amplifier 240 amplifies the voltage according to the change of the electric field generated in the sensor head 224. The output from the amplifier 240 is sent to the A / D converter 28 as the output of the metal fiber distribution detection sensor 22 of FIG. The A / D conversion unit 28 converts the signal input from the metal fiber distribution detection sensor 22 into a digital signal and outputs the digital signal to the sampling unit 32.

The timing bar detection sensor 24 is an optical sensor for detecting the timing bar 16. The output from the timing bar detection sensor 24 is sent to the A / D conversion section 30, converted into a digital signal by the A / D conversion section 30, and sent to the sampling section 32.

The medium position detecting sensor 26 is a sensor for detecting the position of the gift certificate 10, and its detection output (signal) is sent to the sampling section 32.

The sampling section 32 detects the position of the gift certificate 10 from the signal from the medium position detection sensor 26,
The position of the timing bar 16 is detected based on the signal from the timing bar detection sensor 24, and the signal input from the metal fiber distribution detection sensor 22 as shown in FIG. 9 is synchronized with the timing bar 16 as shown in FIG. Then, the signal is sampled and output as a signal as shown in FIG.

The external input / output terminal 34 is, for example, RS232.
C or the like is used, and the sampled output from the sampling unit 32 is output to the halftone dot setting unit 36. A halftone dot conversion table 38 is connected to the halftone dot setting unit 36, and the halftone dot density corresponding to the sampled output is stored in the halftone dot conversion table 38. The halftone dot setting unit 36 refers to the data of the halftone dot conversion table 38 and sets the density of the halftone dots corresponding to the sampled output from the sampling unit 32.

As shown in FIG. 11, the setting of this halftone dot is 10 between the maximum value and the minimum value of the sampled output.
The gradation is divided into stages and the gradation corresponding to each of the 10 stages is set by a halftone dot rate. At this time, the relationship between the halftone dot rate and the sensitivity of the optical sensor is not linear as in the sensitivity curve shown in FIG. 12. For example, when the halftone dot rate exceeds 50%, the sensitivity of the optical sensor hardly increases. Therefore, as shown in FIG. 13, it is preferable that most of the gradations in 10 steps are applied to the area where the halftone dot ratio is less than 50%.

The sensitivity curve of the optical sensor used in this embodiment has a curve as shown in FIG. 12, but depending on the type of the optical sensor, the sensitivity curve may have linearity. In this case, It is necessary to change the density of the halftone dots separately stored in the halftone dot conversion table 38.

Returning to FIG. 5, the printing section 40 uses, for example, a laser printer, and the set halftone dot is the gift certificate 10.
Is printed on the distribution display unit 14. At this time, the gift certificate 10
The halftone dots printed on the distribution display unit 14 may be divided for each density as shown in FIG. 4, or may be continuously arranged corresponding to the detected output waveform (signal). The density of halftone dots may be changed.

The operation of the ticket issuing device for the gift certificate 10 will be described with reference to the flowchart of FIG. As shown in FIG. 8, first, the distribution of the conductor 1a of the gift certificate 10 is read by the electric field penetration method by the metal fiber distribution detection sensor 22 (step 10).
2). Next, the portion of the read waveform that is synchronized with the timing bar 16 is quantized as shown in FIG. 10 (step 104). Next, the quantized data at the position of the timing bar 16 is normalized (step 106).
That is, as shown in FIG. 11, the quantized waveform is divided into 10 steps, and then the normalized value is compared with the data of the halftone dot conversion table 38 to form halftone dots (step 1
08), the halftone dots are printed on the distribution display unit 14 of the gift certificate 10 by the printing unit 40 such as a laser printer at a halftone dot ratio set at a position synchronized with each timing bar 16 to issue the gift certificate 10 (step). 110).

At this time, although not shown in FIG. 8, the order of the waveforms normalized in step 106 is, for example, 1
By changing the order using the ticket issuing date of 0 as a key (simple encryption), and then proceeding to step 108,
It is possible to effectively prevent falsification of the gift certificate 10.

FIG. 14 shows an embodiment of an inspection device for inspecting the gift certificate 10 of FIG. 1 as an example of the identification medium inspection device used in the identification medium authentication method according to the present invention. . As shown in the figure, the gift certificate inspection device includes a metal fiber distribution detection sensor 22, a halftone dot pattern detection sensor 42,
Timing bar detection sensor 24, medium position detection sensor 2
6. The metal fiber distribution detection sensor 22, the timing bar detection sensor 24, and the medium position detection sensor 26 are
Since the functional unit is the same as the issuing device for the gift certificate 10 shown in FIG. 5, the description thereof is omitted here.

The halftone dot pattern detection sensor 42 is used for the gift certificate 10.
2 is an optical sensor for detecting the density of the pattern of halftone dots printed on the distribution display section 14 of FIG. Metal fiber distribution detection sensor 2
2. The outputs of the halftone dot pattern detection sensor 42 and the timing bar detection sensor 24 are A / D conversion units 28 and 44, respectively.
It is sent to 30 and converted into digital data. The sampling unit 46 detects the position of the gift certificate 10 based on the signal from the medium position detection sensor 26, detects the position of the timing bar 16 based on the signal from the timing bar detection sensor 24, and detects the metal fiber distribution detection sensor 22. A signal input from the sampling bar is sampled in synchronization with the timing bar 16, and a signal input from the halftone dot pattern detection sensor 42 is sampled in synchronization with the timing bar 16.

The sampled signal from the metal fiber distribution detecting sensor 22 is quantized and normalized in the quantizing / normalizing section 48, while the sampled signal from the halftone dot pattern detecting sensor 42 is also quantized / normalized. The normalization unit 48 quantizes and normalizes. in this way,
It is determined whether the signal from the metal fiber distribution detection sensor 22 and the signal from the halftone dot pattern detection sensor 42 are in each of the above 10 stages at each sampling point, and these are compared in the comparison unit 50. If the comparison results match, the gift certificate 10 is judged to be valid. If they do not match, it is judged to have been forged or falsified. The result of the determination is sent to the determination result display unit 52, and if it is determined that the gift certificate 10 is valid, for example, it is forged or tampered with by displaying it in characters by blue lighting or liquid crystal display. If it is determined that the gift certificate 10 is a valid gift certificate 10, the characters are displayed by red lighting or liquid crystal display, and the determination result of the gift certificate 10 is displayed.

Since the gift certificate inspecting apparatus is composed of a circuit having the same functional units as the gift certificate issuing apparatus, it should be configured as a ticket issuing and inspecting apparatus sharing these same functional sections. You can also

The operation of the gift certificate inspection apparatus will be described with reference to the flowchart of FIG. As shown in FIG. 15, first, the distribution of the conductor 1a of the gift certificate 10 is detected by the electric field penetration method by the metal fiber distribution detection sensor 22 (step 12).
2), quantize and normalize (step 124). Next, the density of the halftone dot pattern printed on the distribution display portion 14 of the gift certificate 10 is detected by the halftone dot pattern detection sensor 42 (step 126) and quantized and normalized (step 128). Next, the information obtained by normalizing the conductor 1a is compared with the information obtained by normalizing the halftone dot pattern (step 13).
0), it is determined whether or not they match (step 132).
If they match, the fact that the gift certificate 10 is a genuine ticket is displayed (step 134). If they do not match, the fact that the gift certificate 10 is a fake ticket is displayed (step 13).
6).

At this time, although not shown in FIG.
When the order of the normalized waveforms is exchanged and encrypted in step 128, the order of the normalized waveforms in step 128 is exchanged, for example, using the date of issue of the gift certificate 10 as a key (simple decoding), Further, by proceeding to step 130, it is possible to effectively prevent tampering with the gift certificate 10.

According to this embodiment, at the time of issuing a ticket as described above, the distribution of the conductor 1a of the gift certificate 10 is read along the track 18, and the signal of the read distribution pattern is sampled in synchronization with the timing bar 16. Then, the maximum value and the minimum value are quantized in 10 steps and the halftone dot pattern is replaced and printed on the distribution display unit 14 of the gift certificate 10. At the time of authentication, the distribution of the conductor 1a of the gift certificate 10 is read along the track 18, and the distribution display unit 14
The halftone dot patterns are read, and these are sampled and quantized in synchronization with the timing bar 16 and compared. Since a halftone dot pattern corresponding to the distribution pattern of the conductors 1a is printed on the distribution display portion 14 of the gift certificate 10 at the time of issuing the ticket, if they match, it is determined to be a genuine note.

As described above, not only the distribution pattern of the conductor 1a is detected, but also the halftone dot pattern corresponding thereto is detected, and the authenticity of the gift certificate 10 is judged by comparing them with each other. The judgment can be made appropriately and easily. Further, since the ticket issuing and checking device can be shared, the circuit configuration of the ticket issuing and checking device can be simplified. Furthermore, since a halftone dot pattern is used as a pattern corresponding to the distribution pattern of the conductor 1a, for example, when displaying 0 to 9 by a digital pattern when displaying 10 steps as described above, 4 bits, that is, 4 In contrast to the case where one pattern is required, in the case of the halftone dot pattern of this embodiment, one pattern is sufficient, information can be displayed without requiring a large space, and an optical sensor is also used for reading. Can be done without problems.

Further, according to the present embodiment, since the distributed pattern of the conductor 1a is read by detecting the electric field, the method for measuring the distribution pattern of the conductor 1a by measuring the capacitance can be used. In comparison, the occurrence of DC drift is extremely small, and it is possible to detect a stable distribution pattern.
Also in the detection of the distribution pattern, since the output error due to the distance between the gift certificate 10, the sensor head 222, and the sensor head 224 is small, it is not necessary to bring the gift certificate 10 close to or in contact with the sensor head 222 or 224. The design accuracy of the product is low, and the gift certificate 10
Since the amount of the electric field passing through is detected, it can be applied to the ticket issuing (issuing) of media other than the thick gift certificate 10 and the authentication.

In the above embodiment, the distribution pattern of the conductor 1a is displayed by the halftone dot pattern, but the distribution display section 14 displaying the pattern of the conductor 1a is displayed.
Is not limited to halftone dots and may be another pattern as long as it can be optically detected.

The medium to be identified is not limited to the securities such as the gift certificate in the above example, but may be an ID card, a credit card, a certificate, or any other medium that requires authentication to prevent forgery.

[0060]

According to the present invention, the distribution of the conductors embedded in the medium is detected by using the electric field detecting means, and the detected distribution of the conductors is used as information that can be detected by the optical detecting means. , The medium is printed, and the distribution of the conductors embedded in the medium is detected by using the electric field detection means, and the detected distribution of the conductors and the optical detection means at the time of ticketing the medium are detected. The authenticity of the medium is judged by comparing the recorded information as much as possible.

Therefore, the distribution pattern peculiar to the medium and the density pattern corresponding to the medium can be easily and accurately detected by a simple device, and the ticketing of the medium with high security can be easily performed.

[Brief description of drawings]

FIG. 1 is a diagram showing an example in which an identification medium used in an authentication method according to the present invention is applied to a gift certificate.

FIG. 2 is a diagram showing a process of issuing the gift certificate of FIG.

FIG. 3 is a diagram showing a process of issuing the gift certificate of FIG. 1.

FIG. 4 is an enlarged view showing a distribution display unit 14 of FIG.

FIG. 5 is a block diagram showing an embodiment in which the issuing device of the identification medium used in the authentication method according to the present invention is applied to a ticket issuing device for gift certificates.

6 is a schematic configuration diagram showing an embodiment of the configuration of the metal fiber distribution detection sensor 22 of FIG.

FIG. 7 is a plan view showing a part of FIG.

FIG. 8 is a flowchart showing a ticket issuing operation of a medium according to the authentication method of the present invention.

9 is a diagram showing a distribution read by the metal fiber distribution detection sensor 22 of FIG.

FIG. 10 is a diagram showing sampling of the signal of FIG. 9.

11 is a diagram showing quantization of the signal of FIG.

FIG. 12 is a diagram showing a sensitivity curve of halftone dot ratio and optical sensor sensitivity.

FIG. 13 is a diagram showing an example of a correspondence relationship between a halftone dot rate and gradation.

FIG. 14 is a block diagram showing an embodiment in which the identification medium inspection device used in the authentication method according to the present invention is applied to a gift certificate inspection device.

FIG. 15 is a flowchart showing a medium inspection operation according to the authentication method of the present invention.

FIG. 16 is a diagram showing an example of a conventional card.

[Explanation of symbols]

 1 Card 1a Conductor 10 Gift Certificate 12 Printing 14 Distribution Display Section 16 Timing Bar 18 Track 20 Bar Code 22 Metal Fiber Distribution Detection Sensor 24 Timing Bar Detection Sensor 26 Medium Position Detection Sensor 28, 30, 44 A / D Converter 32 , 46 Sampling unit 36 Halftone setting unit 38 Halftone conversion table 40 Printing unit 42 Halftone pattern detection sensor 48 Quantization / normalization unit 50 Comparison unit 52 Judgment result display unit 222, 224 Sensor head 226 AC power supply 228, 230 Copper Foil 232, 234 Acrylic plate 236, 238 Hole 240 Amplifier

Claims (7)

[Claims] 1. A method of issuing an identification medium, comprising an identification medium in which fibrous conductors are randomly scattered, and a device for issuing the identification medium, wherein the device for issuing the ticket is the identification medium. Of electric field detection means for detecting a change in electric field generated according to the distribution of the electric conductor, and level division for dividing the electric field detected by the electric field detection means into predetermined levels based on the maximum and minimum values of the electric field. Means, an optical reflection quantity conversion means for converting the value of the electric field divided by the level division means into an optical reflection quantity, and an optical reflection quantity converted by the optical reflection quantity conversion means for the optical reflection quantity of the identification medium. And a means for recording the information in an area for displaying the identification medium. 2. The ticket issuing system according to claim 1, wherein the ticket issuing device includes means for encrypting information recorded in an area for displaying information according to the optical reflection amount of the identification medium. Issuing method of the characteristic identification medium. 3. An identification method for an identification medium, comprising an identification medium in which fibrous conductors are randomly scattered, and an authentication device for confirming the validity of the identification medium, wherein the identification medium is an optical reflection medium. The authentication device has an area for displaying information according to an amount, and the authentication device detects an electric field change generated according to a distribution of the conductor of the identification medium, and an optical device for detecting an optical reflection amount of the area. A detection means, wherein the authentication device detects the distribution of the conductor and the amount of optical reflection of the area and compares them to confirm the legitimacy of the identification medium. Media authentication method. 4. The identification medium according to claim 3, wherein the authentication device further includes means for decoding information recorded in an area for displaying information according to the optical reflection amount. Authentication method. 5. The authentication method for an identification medium according to claim 3, wherein each of the regions represents an optical reflection amount by an area ratio between a printed portion and a non-printed portion. 6. The authentication method for an identification medium according to claim 5, wherein each of the areas represents an optical reflection amount by a halftone dot. 7. The authentication method according to claim 3, wherein the authentication device is arranged on one side of the identification medium and is arranged on a first electrode connected to an AC power source, and on the other side of the identification medium. The second electric field detecting means is connected to the second electrode, and the electric field generated by the voltage applied to the first electrode based on the alternating current from the alternating current power source is the identification. An identification medium authentication method, characterized in that a change occurring in the second electrode according to the distribution of the conductor of the identification medium is detected by passing through the medium.