JPH0439097A - Card and method for discriminating genuineness of the same card - Google Patents
Card and method for discriminating genuineness of the same cardInfo
- Publication number
- JPH0439097A JPH0439097A JP2145433A JP14543390A JPH0439097A JP H0439097 A JPH0439097 A JP H0439097A JP 2145433 A JP2145433 A JP 2145433A JP 14543390 A JP14543390 A JP 14543390A JP H0439097 A JPH0439097 A JP H0439097A
- Authority
- JP
- Japan
- Prior art keywords
- magnetic
- card
- signal recording
- magnetic signal
- authenticity
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 238000000034 method Methods 0.000 title description 11
- 239000000463 material Substances 0.000 abstract description 9
- 229910000859 α-Fe Inorganic materials 0.000 abstract description 5
- 239000000049 pigment Substances 0.000 abstract description 2
- 239000000843 powder Substances 0.000 abstract description 2
- 229910006297 γ-Fe2O3 Inorganic materials 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 7
- 230000000694 effects Effects 0.000 description 4
- 238000007639 printing Methods 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 2
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 239000000696 magnetic material Substances 0.000 description 1
- 230000005415 magnetization Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 229910000938 samarium–cobalt magnet Inorganic materials 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
Abstract
Description
【発明の詳細な説明】
［産業上の利用分野］
本発明は一般に磁気カード上に保磁力を部分的に塗布し
、この有無により真偽を判定するオレンジカードおよび
、メトロカード等のカードおよびカードの真偽判別を行
う方法に関する。[Detailed Description of the Invention] [Field of Industrial Application] The present invention generally relates to cards such as Orange Cards and Metro Cards, in which coercive force is partially applied on a magnetic card, and authenticity is determined based on the presence or absence of coercive force. This paper relates to a method for determining the authenticity of .
［従来の技術］
磁気カードやＩＣカード等のカードが幅広く利用される
に伴い、カードの改造や偽カードの使用を防止するため
、カードの偽造防止技術の重要性が高まっている。[Prior Art] As cards such as magnetic cards and IC cards are widely used, the importance of card counterfeiting prevention technology is increasing in order to prevent the modification of cards and the use of counterfeit cards.
従来１例えば、磁気カードの偽造防止技術には。Conventional 1 For example, in the technology to prevent counterfeiting of magnetic cards.
必要な情報の磁気記録の他に磁気バーコード等を加えて
、この磁気バーコードを判定して偽造されたものかどう
かを判別できるようにしたものや。In addition to the magnetic recording of necessary information, a magnetic barcode is added so that it can be determined whether the magnetic barcode is forged or not.
磁気カードに記録される記録信号の波形を複雑にしたり
、記録信号を変調波を用いて記録したりすることにより
、偽造を防止するものがある。Some methods prevent counterfeiting by complicating the waveform of the recording signal recorded on a magnetic card or by recording the recording signal using a modulated wave.
磁気カードに対して、これらの方法の併合により偽造防
止効果を高めることができる。For magnetic cards, the combination of these methods can enhance the anti-counterfeiting effect.
［発明が解決しようとする課題］
しかしながら、上述の磁気バーコードを用いる方法、記
録された記録信号の波形を複雑にしたり。[Problems to be Solved by the Invention] However, the method using the above-mentioned magnetic barcode makes the waveform of the recorded recording signal complicated.
記録信号を変調波を用いて記録する方法は、記録が磁気
信号である以上は、磁気読取り装置により読取りが可能
であったり、偽造を完全に防止することは不可能であっ
た。In the method of recording a recording signal using a modulated wave, as long as the recording is a magnetic signal, it is impossible to read it with a magnetic reader or completely prevent forgery.
そこで２本発明の技術的課題は、偽造防止効果が高めら
れ、かつ容易に偽造防止を行うことができるカードの真
偽判別を行う方法と真偽判別手段を備えたカードを提供
することにある。Therefore, two technical objects of the present invention are to provide a method for determining the authenticity of a card and a card equipped with a means for determining authenticity, which enhances the anti-counterfeiting effect and can easily prevent counterfeiting. .
［課題を解決するための手段］
本発明によれば、カードの面上に形成された少なくとも
５ ｋｏｅの保磁力を有する真偽判別用磁気信号記録
部を備えたことを特徴とする真偽判別用磁気信号記録部
を備えたカードが得られる。[Means for Solving the Problems] According to the present invention, an authenticity determination device is provided with a magnetic signal recording section for authenticity determination having a coercive force of at least 5 koe formed on the surface of a card. A card equipped with a magnetic signal recording section is obtained.
本発明によれば、前記真偽判別用磁気信号記録部を備え
たカードにおいて、前記真偽判別用磁気信号記録部は、
前記カードの側辺に沿って帯状に形成されていることを
特徴とする真偽判別用磁気信号記録部を備えたカードが
得られる。According to the present invention, in the card including the magnetic signal recording section for determining authenticity, the magnetic signal recording section for determining authenticity includes:
A card is obtained which is provided with a magnetic signal recording section for authenticity determination, which is formed in a band shape along the side of the card.
本発明によれば、前記したいずれかの真偽判別用磁気信
号記録部を備えたカードの真偽判別用磁気信号記録部に
所定の高磁場で予め着磁しておきカードの前記真偽判別
用磁気信号記録部を前記所定の高磁場以下の磁界で消磁
し、前記真偽判別用磁気信号記録部に残留する磁気信号
を読み取ることで真偽を判別することを特徴とするカー
ドの真偽判別を行う方法が得られる。According to the present invention, the magnetic signal recording section for authenticity determination of a card equipped with any of the magnetic signal recording sections for authenticity determination described above is magnetized in advance with a predetermined high magnetic field, and the authenticity determination of the card is performed. The authenticity of the card is determined by demagnetizing the magnetic signal recording section for use with a magnetic field lower than the predetermined high magnetic field and reading the magnetic signal remaining in the magnetic signal recording section for authenticity determination. A method for making the determination can be obtained.
即ち２本発明は、カード表面又は紙、ブラツスチックス
等の一般基材上に高保磁力材料（Ｈｃ−５ｋＯｅ以上）
を印刷又は塗布することにより。Namely, the present invention provides high coercive force material (Hc-5kOe or more) on the surface of the card or on a general base material such as paper or Brasssticks.
By printing or coating.
従来のオレンジカード、メトロカード等の低保磁力材料
とは異なった材料を用い、新しい真偽判別用磁気信号記
録部を備えているカードである。This card uses a material different from the low coercive force material of conventional Orange Cards, Metro Cards, etc., and is equipped with a new magnetic signal recording section for authenticity determination.
また１本発明では前記カードを用いて、高保磁力の真偽
判別用磁気信号記録部に、２０ｋＯｅ以上の高磁場で磁
気バーコードを形成し、−旦この記録部を３〜４ｋＯｅ
の磁場で消磁し、この消磁されない真偽判別用磁気信号
記録部の磁気バーコードを読み取ることで真偽を判別す
る方法である。In addition, in one aspect of the present invention, a magnetic barcode is formed on the high coercive force magnetic signal recording section for authenticity discrimination using a high magnetic field of 20 kOe or more, using the card, and - once this recording section is 3 to 4 kOe
In this method, the authenticity is determined by demagnetizing the product with a magnetic field and reading the magnetic barcode on the magnetic signal recording section for authenticity determination that is not demagnetized.
尚１本発明において、用いられる高保磁力材料としては
、ＳｍＣｏ、Ｓｒフェライト、Ｎｄ−ＦｅｅＢ等が使用
できるが、これらに限定されるものではない。In the present invention, high coercive force materials that can be used include SmCo, Sr ferrite, Nd-FeeB, etc., but are not limited to these.
［作 用］
本発明の真偽判別手段を備えたカードにおいては、バー
コード形状に塗布または印刷された高保磁力材料からな
る真偽判別用磁気信号記録部が形成されている。本発明
のカードの真偽判別方法では、このカードを用いて、記
録された真偽判別用磁気信号記録部のバーコードを消磁
した後に、残存するバーコード消磁状態を判別すること
により。[Function] In the card equipped with the authenticity determining means of the present invention, a magnetic signal recording portion for determining authenticity is formed of a high coercive force material coated or printed in the shape of a barcode. In the card authenticity determination method of the present invention, the card is used to demagnetize the barcode recorded in the magnetic signal recording section for authenticity determination, and then determine the demagnetized state of the remaining barcode.
カードの真偽を判別することができる。It is possible to determine whether a card is genuine or false.
［実施例コ 以下に本発明の実施例を図面を用いて説明する。[Example code] Embodiments of the present invention will be described below with reference to the drawings.
第１図は本発明の実施例に係るカードを示す断面図であ
る。FIG. 1 is a sectional view showing a card according to an embodiment of the present invention.
第１図において２紙またはプラスチック等の非磁性の支
持材上に、保磁力３００〜３００００ｅのγ−Ｆｅ２０
．又はＢａフェライトを塗布し、記録層２とし、この記
録層２上にＳｒフェライトの粉末を顔料とするインキを
第２図（ａ）のように、厚さ５〜１０μｍ程度に印刷し
て、真偽判別用磁気信号記録部１１を形成している。In Figure 1, γ-Fe20 with a coercive force of 300 to 30,000e is placed on a non-magnetic support material such as paper or plastic.
．． Alternatively, Ba ferrite is coated to form the recording layer 2, and ink containing Sr ferrite powder as a pigment is printed on this recording layer 2 to a thickness of about 5 to 10 μm as shown in Figure 2 (a). A magnetic signal recording section 11 for detecting fakes is formed.
この時の印刷は、シルク印刷で３００メツシユで行い、
この時のインキ成分は、第１表の通りである。The printing at this time was done using silk printing with 300 meshes.
The ink components at this time are as shown in Table 1.
第 １ 表 本発明の実施例に係るカードを使用する際は。Chapter 1 Table When using the card according to the embodiment of the present invention.
このインキで印刷されたカード１０において。In the card 10 printed with this ink.
２０ｋＯｅの磁場を発生される磁気ヘッドにて。With a magnetic head that generates a magnetic field of 20 kOe.
この部分にエンコード（着磁）する。通常の磁気記録は
、真偽判別用磁気信号記録部１１以外の記録層２に対し
て行われる。Encode (magnetize) this part. Normal magnetic recording is performed on the recording layer 2 other than the magnetic signal recording section 11 for authenticity determination.
一方、このカードの使用時においては、３〜４ｋｏｅの
磁場で消磁し、このエンコード内容が残っている事を確
認することにより、真偽を判定する。On the other hand, when this card is used, it is demagnetized with a magnetic field of 3 to 4 koe, and authenticity is determined by confirming that the encoded content remains.
第２図（ｂ）は、第１図（ａ）のカードの他の例を示す
図である。第２図（ｂ）において、磁気カード１０′の
一面の一辺近傍に、この一方に沿って帯状に第１表で示
されるものと同様のインキが印刷され、真偽判別用磁気
信号記録部１１′が形成されている。FIG. 2(b) is a diagram showing another example of the card of FIG. 1(a). In FIG. 2(b), ink similar to that shown in Table 1 is printed in a strip along one side near one side of the magnetic card 10', and the magnetic signal recording section 11 for authenticity determination ' is formed.
第２図（ｂ）の磁気カードも第２図（ａ）の例と同様に
して、カードの真偽が判別される。The authenticity of the magnetic card shown in FIG. 2(b) is determined in the same manner as the example shown in FIG. 2(a).
第３図は本発明の実施例に係る着磁回路を示す図である
。FIG. 3 is a diagram showing a magnetizing circuit according to an embodiment of the present invention.
第３図において１着磁回路は、Ｆｅ系の磁性材料からな
るヨーク３１と、このヨーク３１に施された巻線３２か
らなる着磁ヘッド３０とを備えている。In FIG. 3, one magnetizing circuit includes a yoke 31 made of Fe-based magnetic material and a magnetizing head 30 made of a winding 32 attached to this yoke 31.
磁気カード１０に設けられた真偽判別用磁気信号記録部
１１には、コイルに直流電流Ｉ。を流し。A magnetic signal recording unit 11 for authenticity determination provided in the magnetic card 10 has a coil supplied with a direct current I. sink.
バーコード保磁力の約３倍の磁場を発生させることによ
り２着磁するものである。Double magnetization is achieved by generating a magnetic field approximately three times the coercive force of the barcode.
第４図（ａ）及び第４図（ｂ）は本発明の磁気カードの
バーコードを読み出す読出し回路の具体的構成を示す図
である。FIGS. 4(a) and 4(b) are diagrams showing a specific configuration of a reading circuit for reading a barcode of a magnetic card according to the present invention.
第４図（ａ）および（ｂ）において、読みだし回路は、
第３図の磁気ヘッド３０と同じ構成であるが、その電流
値■１が異なる。In FIGS. 4(a) and (b), the readout circuit is
Although it has the same configuration as the magnetic head 30 in FIG. 3, its current value (1) is different.
第４図（ａ）において、記録された磁気カード１０は、
第３図の磁気ヘッド３０と同様に、へ・ンドＩ。より小
さな電流１１を流して、磁場３〜４ｋｏｅで消磁する。In FIG. 4(a), the recorded magnetic card 10 is
Similar to the magnetic head 30 in FIG. A smaller current 11 is applied to demagnetize with a magnetic field of 3 to 4 koe.
バーコードが消磁ヘッドを通過しても高磁力用であるの
で、バーコードが消磁されないで残存する。（一般的な
磁場に保磁力では消磁するレベルの電流１．＜Ｉ。であ
る。）。Even if the barcode passes through the degaussing head, the barcode remains without being demagnetized because it is for high magnetic force. (The current is 1.<I., which is at a level that demagnetizes with coercive force in a general magnetic field.)
第４図（ｂ）において、第４図（ａ）で消磁された磁気
カード１０のバーコードは、磁気ヘッド４０により読み
出される。In FIG. 4(b), the barcode of the magnetic card 10 demagnetized in FIG. 4(a) is read by the magnetic head 40. In FIG.
第４図（ｂ）において、真偽判別装置は、消磁ヘッド３
０を備えた消磁ヘッド駆動部、磁気ヘッド４１．および
コイル４２を備えた磁気ヘッド４０ 増幅器３３１判定
回路３４とを備えている。In FIG. 4(b), the authenticity determination device includes the degaussing head 3.
0, a degaussing head drive section with a magnetic head 41. and a magnetic head 40 equipped with a coil 42, an amplifier 331, and a determination circuit 34.
磁気カードリーダに第４図（ｂ）の装置が組み込まれた
場合において、磁気カード１０に予め備えられたカード
種別等の磁気記録情報は２図示しない磁気記録読取り装
置によって、読み取られる。When the device shown in FIG. 4(b) is incorporated into a magnetic card reader, magnetic recording information such as card type, etc., provided in advance on the magnetic card 10 is read by a magnetic recording reading device (not shown).
磁気カード１０は、真偽判別用磁気信号記録部１１にバ
ーコードが形成されている。磁気ヘッド３０により第４
図（ａ）に示すように消磁されなかった高保磁力に記録
された残存するバーコードが読み取られ増幅器３３によ
り増幅され、バーコード信号ｆＢを判定部３４に出力す
る。判定部３４はメモリを内蔵し、予め記憶された基準
値ｆｒと増幅器３３からのバーコード信号ｆＢが一致し
た場合において、一致信号ｆｅを出力し、不一致の場合
に不一致信号ｆｎを出力する。In the magnetic card 10, a bar code is formed in a magnetic signal recording section 11 for determining authenticity. The magnetic head 30 causes the fourth
As shown in FIG. 3A, the remaining barcode recorded with a high coercive force that has not been demagnetized is read and amplified by the amplifier 33, and a barcode signal fB is output to the determination section 34. The determination unit 34 has a built-in memory, and outputs a coincidence signal fe when the pre-stored reference value fr and the barcode signal fB from the amplifier 33 match, and outputs a mismatch signal fn when they do not match.
一致信号ｆｅ又は不一致信号ｆｎにより１例えば１図示
しない警報を発する警報回路に信号が出力される。Depending on the match signal fe or the mismatch signal fn, a signal is outputted to an alarm circuit (not shown) that issues an alarm, for example.
実施例のカードにおいては、真偽判別用磁気信号記録部
１１を繰り返し、消磁を行なっても、その出力は、低減
することはない。In the card of the embodiment, even if the authenticity determination magnetic signal recording section 11 is repeatedly demagnetized, its output does not decrease.
通常の磁気カードでは、消磁後、磁気ヘッドからの出力
信号が発生しないので、一致信号ｆｅは出力されないか
、必ず不一致信号が出力される。In a normal magnetic card, no output signal is generated from the magnetic head after degaussing, so either the coincidence signal fe is not output or a mismatch signal is always output.
尚１本実施例においては、＠、消磁ヘッド３０および磁
気ヘッド４０は夫々側のものを使用したが、３種とも同
じ構成のものを使用しても、また。Note that in this embodiment, the degaussing head 30 and the magnetic head 40 were used on each side, but it is also possible to use the same structure for all three types.
一方を他方に兼用してもその効果においては、全く変わ
るところはない。Even if one is used for the other, there is no difference in the effect at all.
［発明の効果］
以上説明したように２本発明によれば、容易に製造でき
、かつ偽造防止ができるカードの真偽判別を行う方法と
、真偽判別用磁気信号記録部を備えたカードを提供する
ことができる。[Effects of the Invention] As explained above, according to the two aspects of the present invention, there is provided a method for determining the authenticity of a card that can be easily produced and prevents counterfeiting, and a card equipped with a magnetic signal recording section for determining authenticity. can be provided.
第１図は本発明の実施例に係るカードの構造を示す部分
断面図、第２図（ａ）は第１図のカードの一例を示す図
、第２図（ｂ）は、第１図のカードの他の例を示す図、
第３図は本発明の実施例に係る着磁回路を示す図である
。第４図（ａ）及び第４図（ｂ）は本発明のカードのバ
ーコードの読出し回路の具体的構成を示す図である。
図中、１・・・支持基材、２・・・記録層、３・・・印
刷面。
１０．１０−・・・磁気カード、１１．１１−・・・真
偽判別用磁気信号記録部、３０・・・磁気ヘッド、３１
・・・ヨーク、３２・・・コイル、３３・・・増幅器、
３４・・・判定回路、３５・・・消磁ヘッド駆動部、４
０・・・磁気ヘッド、４１・・・ヨーク、４２・・・コ
イル。
第
図
第４！！Ｉ
（ａ）
１、 （Ｉｏ＞ Ｉ＋ ）FIG. 1 is a partial cross-sectional view showing the structure of a card according to an embodiment of the present invention, FIG. 2(a) is a diagram showing an example of the card shown in FIG. 1, and FIG. Diagrams showing other examples of cards,
FIG. 3 is a diagram showing a magnetizing circuit according to an embodiment of the present invention. FIGS. 4(a) and 4(b) are diagrams showing a specific configuration of a barcode reading circuit for a card according to the present invention. In the figure, 1... Supporting base material, 2... Recording layer, 3... Printing surface. 10.10-...Magnetic card, 11.11-...Magnetic signal recording section for authenticity determination, 30...Magnetic head, 31
...Yoke, 32...Coil, 33...Amplifier,
34... Determination circuit, 35... Demagnetizing head drive section, 4
0...Magnetic head, 41...Yoke, 42...Coil. Figure 4! ! I (a) 1, (Io> I+)
Claims (1)
磁力を有する真偽判別用磁気信号記録部を備えたことを
特徴とする真偽判別用磁気信号記録部を備えたカード。 ２、第１の請求項記載の真偽判別用磁気信号記録部を備
えたカードにおいて、前記真偽判別用磁気信号記録部は
、前記カードの側辺に沿って帯状に形成されていること
を特徴とする真偽判別用磁気信号記録部を備えたカード
。 ３、第１または第２の請求項記載の真偽判別用磁気信号
記録部を備えたカードの真偽判別用磁気信号記録部に所
定の高磁場で予め着磁しておき、カードの前記真偽判別
用磁気信号記録部を前記所定の高磁場以下の磁界で消磁
し、前記真偽判別用磁気信号記録部に残留する磁気信号
を読み取ることで真偽を判別することを特徴とするカー
ドの真偽判別を行う方法。[Scope of Claims] 1. A magnetic signal recording section for authenticity determination, characterized in that the magnetic signal recording section for authenticity determination has a coercive force of at least 5 kOe and is formed on the surface of the card. card. 2. In the card equipped with a magnetic signal recording section for authenticity determination according to the first claim, the magnetic signal recording section for authenticity determination is formed in a band shape along the side of the card. A card equipped with a magnetic signal recording section for distinguishing authenticity. 3. Magnetize the magnetic signal recording section for authenticity determination of a card equipped with the magnetic signal recording section for authenticity determination according to the first or second claim in advance with a predetermined high magnetic field, and The authenticity of the card is determined by demagnetizing the counterfeit discrimination magnetic signal recording section with a magnetic field lower than the predetermined high magnetic field and reading the magnetic signal remaining in the authenticity discrimination magnetic signal recording section. How to determine authenticity.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2145433A JP2949636B2 (en) | 1990-06-05 | 1990-06-05 | How to determine the authenticity of a card |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2145433A JP2949636B2 (en) | 1990-06-05 | 1990-06-05 | How to determine the authenticity of a card |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0439097A true JPH0439097A (en) | 1992-02-10 |
| JP2949636B2 JP2949636B2 (en) | 1999-09-20 |
Family
ID=15385135
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2145433A Expired - Lifetime JP2949636B2 (en) | 1990-06-05 | 1990-06-05 | How to determine the authenticity of a card |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2949636B2 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH05318974A (en) * | 1992-05-26 | 1993-12-03 | Tomoegawa Paper Co Ltd | Magnetic recording medium and manufacture thereof |
| EP0632398A2 (en) * | 1993-06-24 | 1995-01-04 | Nhk Spring Co., Ltd. | Method and apparatus for checking whether or not objects are authentic |
| EP0696779A1 (en) * | 1994-07-11 | 1996-02-14 | Toppan Printing Co., Ltd. | Data recording medium |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61145727A (en) * | 1984-12-19 | 1986-07-03 | Dainippon Printing Co Ltd | Cards having magnetic recording medium and its recording method |
| JPS6233325A (en) * | 1985-08-06 | 1987-02-13 | Tomoegawa Paper Co Ltd | Heat sensitive magnetic recording medium |
| JPS63213117A (en) * | 1987-02-28 | 1988-09-06 | Hitachi Maxell Ltd | Magnetic card |
-
1990
- 1990-06-05 JP JP2145433A patent/JP2949636B2/en not_active Expired - Lifetime
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61145727A (en) * | 1984-12-19 | 1986-07-03 | Dainippon Printing Co Ltd | Cards having magnetic recording medium and its recording method |
| JPS6233325A (en) * | 1985-08-06 | 1987-02-13 | Tomoegawa Paper Co Ltd | Heat sensitive magnetic recording medium |
| JPS63213117A (en) * | 1987-02-28 | 1988-09-06 | Hitachi Maxell Ltd | Magnetic card |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH05318974A (en) * | 1992-05-26 | 1993-12-03 | Tomoegawa Paper Co Ltd | Magnetic recording medium and manufacture thereof |
| EP0632398A2 (en) * | 1993-06-24 | 1995-01-04 | Nhk Spring Co., Ltd. | Method and apparatus for checking whether or not objects are authentic |
| EP0632398A3 (en) * | 1993-06-24 | 1995-09-13 | Nhk Spring Co Ltd | Method and apparatus for checking whether or not objects are authentic. |
| EP0696779A1 (en) * | 1994-07-11 | 1996-02-14 | Toppan Printing Co., Ltd. | Data recording medium |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2949636B2 (en) | 1999-09-20 |
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