JPH0896105A - Information recording medium and information recording method - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide an information recording medium and an information recording method, which have improved durability, can be recorded in a non-contact manner when a card is manufactured, and can be read in a non-contact manner when reading information. 1. A non-contact readable information recording medium 1, comprising a dielectric layer 7 in which a surface acoustic wave element 5 is embedded on at least one surface of a metal substrate 3, and a dielectric layer 7 on the dielectric layer 7. Metal thin film layer 9 provided on the surface excluding the surface acoustic wave element 5.
And a separation layer 1 provided on the metal thin film 9 and having a window 11a forming a void 21 on the surface of the surface acoustic wave element 5.
1 and a concealing layer 13 provided on the separation layer 11 for concealing recorded information provided on the surface acoustic wave element 5, and a transparent protective layer 15 provided on the concealing layer 13 are sequentially laminated. Information recording medium. An information recording method for an information recording medium, wherein individual information is recorded on the input electrode 17 and the output electrode 19 of the surface acoustic wave element 5 by a heat beam such as a laser beam.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an information recording medium which can read information in a contactless manner without requiring a power source and can reliably prevent forgery of individual information, and an information recording method therefor.

[0002]

2. Description of the Related Art As a conventional information recording medium, for example,
A magnetic card such as a cash card or a credit card that has a strip-shaped magnetic recording section on one side of the card,
Magnetic cards having a magnetic recording layer inside such as telephone cards have become widespread. However, in the above-mentioned magnetic card, it is necessary to read the information by sliding it in contact with the reproducing head when reproducing the information, which causes trouble that the reproducing operation is troublesome and the recorded information is erased by a strong external magnetic field. There is a problem such as storage, and there are difficulties in durability and information retention.

Therefore, in order to solve these problems,
As a magnetic card in which an individual information pattern is formed by embedding a metal piece in the middle part of the card or providing a metal vapor deposition layer inside the card and partially removing the metal piece or the metal vapor deposition layer according to a predetermined pattern. , For example,
1) JP-A-55-146570 and 2) JP-A-5
The one proposed in Japanese Patent No. 294095 is known.

As shown in FIGS. 14 and 15, the magnetic card 41 of the above 1) is a thin flat plate 4 made of plastic or the like.
3 is provided with a magnetic recording portion 45, and a large number of non-magnetic metal pieces 49 such as aluminum are embedded in a blank portion 47 where the magnetic recording portion 45 is not provided in the vertical and horizontal directions according to a predetermined rule. It is formed by

The magnetic card 51 of the above 2) has a magnetic layer 5 formed on a base material 53, as shown in FIGS.
A metal vapor deposition layer 57 having a predetermined area is formed on the metal layer 5, and the metal vapor deposition layer 57 is intermittently removed to form a non-removed portion 59 where the metal vapor deposition layer 57 exists and a partially removed removal portion 61. An information pattern is formed by a combination of the above, and a masking layer 63 and a wear-resistant protective layer 65 are further laminated on the upper surface of the metal vapor deposition layer 57.

Then, the metal vapor deposition layer 57 is removed when the individual information pattern is formed by heating a contact recording head (not shown) in contact with the surface of the protective layer 65 and heating it in accordance with a normal recording method. Be done. For example, FIG.
As shown in FIG. 7, a thermosensitive recording head (not shown) is brought into contact with the card 51 in which a plurality of layers are laminated from the protective layer 65 side, and the heating element of the thermosensitive recording head is energized. The heat generated by this energization is conducted to the metal vapor deposition layer 57 via the protective layer 65, and the removed portion 61 is formed in the metal vapor deposition layer 57 by heating and melting the metal vapor deposition layer 57.

The recording information can be read by moving the card 51 and the read head 67 relatively at a constant speed. The thickness of the protective layer of the magnetic card 51 is 0.1 to
The thickness is 10 μm, and the opaque visible layer hides the recorded data and prevents the information pattern from being read illegally.

[0008]

However, according to the magnetic card of the type in which the metal piece is embedded as in the above 1), information must be recorded in the intermediate step of manufacturing the magnetic card, and the manufacturing work thereof is required. There is a problem that becomes complicated. In addition, there is a problem that the data setting means, the data reading device, and the like have to be large-scaled.

In the magnetic card of the type in which information is recorded by combining the non-removed portion where the metal vapor deposition layer is present and the removed portion where it is not present as in the above 2), the structure is such that the recording is carried out by a normal thermal recording head. There is a possibility that data can be illegally additionally recorded relatively easily, and further, the durability of the card is slightly inferior because the thickness of the protective layer is restricted. Further, in both 1) and 2) above, when the magnetic card is inserted into a predetermined position of the reading device in reading the information, the card is temporarily released by the card holder, so that it takes time to read the information. However, there was a problem that labor for inserting and receiving cards was required.

The present invention has been made in view of the above circumstances, and a protective layer of a card is thickened to improve durability, a non-contact recording of an intermediate layer is possible at the time of manufacturing a card, and a reading is performed at the time of reading information. An object of the present invention is to provide an information recording medium and an information recording method capable of reading recorded information in a contactless manner without inserting a card into an apparatus.

[0011]

An information recording medium according to the present invention is an information recording medium which receives an electromagnetic wave from a reading device, returns individual data by the electromagnetic wave, and can be read in a non-contact manner. A dielectric layer in which a surface acoustic wave element whose surface acoustic wave is a Rayleigh wave is embedded on at least one surface of a base material, and a metal thin film provided on the surface of the dielectric layer excluding the surface acoustic wave element. A layer, a separation layer provided on the metal thin film and having a window portion forming a void on the surface of the surface acoustic wave element, and a recording provided on the surface acoustic wave element provided on the separation layer. A hidden layer that hides information,
It is characterized in that it is formed by sequentially laminating a transparent protective layer provided on the concealing layer.

Further, the information recording medium according to the present invention is an information recording medium which receives an electromagnetic wave from a reading device, returns individual data by the electromagnetic wave, and can be read in a non-contact manner. On each of the surfaces, a dielectric layer in which a surface acoustic wave element whose surface acoustic wave is a Rayleigh wave is embedded,
A metal thin film layer provided on the surface of the dielectric layer excluding the surface acoustic wave element, and a separation layer having a window portion provided on the metal thin film and forming a void on the surface of the surface acoustic wave element. And a concealment layer provided on the separation layer for concealing recorded information provided on the surface acoustic wave element, and a transparent protective layer provided on the concealment layer, which are sequentially laminated. And

Further, the information recording medium according to the present invention is provided with the receiving and transmitting microstrip antennas independently formed on the metal thin film layer by vapor deposition and etching, respectively. The antenna terminals of the respective microstrip antennas are respectively connected to the input electrode and the output electrode of the surface acoustic wave device during the vapor deposition to form a data transmitting / receiving circuit.

Further, in the information recording medium according to the present invention, the transmission / reception circuit operates only with reception power and does not require a battery for power supply, and the reception circuit receives a BPSK-modulated DS system signal, The transmission circuit is formed as a fixed code matched filter that outputs a burst signal when the received codes match.

Further, the information recording medium according to the present invention is characterized in that visual information such as a visible pattern is formed on the surface of the transparent protective layer by printing or another method.

Further, the information recording medium according to the present invention is an information recording medium which receives an electromagnetic wave from a reading device, returns individual data by the electromagnetic wave, and can be read without contact, and at least a metal base material. On one surface, a dielectric layer in which a surface acoustic wave element whose surface acoustic wave is a Stoneley wave is embedded; a metal thin film layer provided on the surface of the dielectric layer excluding the surface acoustic wave element; An infrared absorbing layer provided on the surface of the surface acoustic wave element, a hiding layer provided on the infrared absorbing layer for hiding recorded information recorded in the surface acoustic wave element, and provided on the hiding layer It is characterized in that it is formed by sequentially laminating a transparent protective layer.

The information recording medium according to the present invention is characterized in that visual information such as a visible pattern is formed on the surface of the transparent protective layer by printing or another method.

In the information recording medium according to the present invention, a concealing layer for printing infrared rays and ultraviolet rays is provided between the metal thin film layer and the transparent protective layer, and the surface acoustic wave device and the metal thin film are provided. It is characterized in that the circuits formed in the layers are hidden.

Further, in the information recording method for an information recording medium according to the present invention, a dielectric layer in which a surface acoustic wave element is embedded on at least one surface of a metal substrate, and a surface other than the surface acoustic wave element are provided. Metal thin film layer, a separation layer or an infrared absorption layer having a window forming a void on the surface of the surface acoustic wave element, a concealing layer for hiding recorded information recorded in the surface acoustic wave, and a transparent protective layer. Is a method for recording information on an information recording medium in which layers are sequentially stacked, wherein individual information is recorded on an input electrode and an output electrode of the surface acoustic wave element by a heat beam such as a laser beam.

[0020]

In such an information recording medium, the transmission signal transmitted from the reading device is received by the receiving microstrip antenna of the card, and the received signal is inputted to the input electrode of the surface acoustic wave element as an electric signal. Transmitted. The electric signal of the input electrode generates a surface acoustic wave by the piezoelectric effect of the surface acoustic wave element, the surface acoustic wave propagates through the surface acoustic wave element to the output electrode, and is detected as an electric signal by the output electrode. It Further, it is transmitted from the output electrode to the transmitting microstrip antenna and transmitted from the surface acoustic wave element to the reading device.
Then, the transmission signal from the microstrip antenna for transmission is read by the reading device, whereby the individual information pattern of the card is detected.

Therefore, the electromagnetic wave from the reader is operated by receiving the electromagnetic wave from the input electrode of the surface acoustic wave element, so that a dedicated battery is not required. Moreover, since the individual information is recorded on the information recording medium by using the microstrip antenna and the fixed code matched filter, the synchronization is not necessary for reading the individual information, and the contactless reading is possible. , When reading the information,
There is no need to insert the information recording medium into the reader,
The reading operation becomes simple. Further, since the surface acoustic wave elements can be provided on both sides of the metal base material, the information recording medium can be read by communication regardless of the front and back sides.

Furthermore, since the microstrip antenna is provided, the receiving sensitivity does not change depending on the angle direction of the antenna. Moreover, by providing the transmitting and receiving antennas on both sides, the directivity can be further expanded. As a result, communication in any direction becomes possible. In addition, the infrared absorption layer is irradiated with a heat beam by a laser beam through a protective layer transparent to infrared rays to melt the metal thin film layer, whereby an information pattern is recorded,
Unlike the past, it is possible to thicken the protective layer,
The durability and strength of the laminated information recording media can be ensured. Furthermore, when recording individual information on the output electrodes of the surface acoustic wave element, all matching codes are written in the phase of the electrode array by trimming of the output electrodes, which makes additional writing impossible. The information recording medium itself becomes unusable, and it becomes difficult to restore the electrodes. As a result, it is possible to reliably prevent additional recording and falsification of the information recording. Further, by providing a concealing layer or a printing layer transparent to infrared rays between the metal thin film layer of the information recording medium and the transparent protective layer, and further by printing visual information on the surface of the protective layer, the metal thin film layer It becomes possible to prevent the information recorded in the above from being read by visible light, and as a result, it becomes impossible to visually recognize the information and it becomes difficult to read the recorded pattern.

Further, in the surface acoustic wave device in which the surface acoustic wave is a Stoneley wave, an infrared absorption layer is provided in place of the separation layer provided between the metal thin film layer and the concealing layer, so that the laser energy for irradiation is radiated. Improve the effect,
It is possible to obtain the effect that the power of the laser light source can be reduced.

[0024]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. In the present embodiment, the case where the present invention is applied to a laminated card as an information recording medium will be described as an example. FIG. 1 is a vertical sectional view showing a laminated structure of a laminated card of this embodiment, FIG. 2 is a plan view showing a microstrip antenna of the laminated card,
Figure 3 shows SAW (Surface Acoustic W)
ave: surface acoustic wave) A plan view showing an input electrode and an output electrode of the element, FIG. 4 is a circuit diagram showing an equivalent circuit of a SAW matched filter, and FIG. 5 is a perspective view showing an input electrode and an output electrode provided in the SAW element. FIG. 6 is a plan view showing the input electrodes and output electrodes of the SAW element before formation of the information pattern.

The laminated card 1 of this embodiment has a rectangular shape as shown in FIG.
On both sides of the metal base material 3, the dielectric layer 7 having the SAW element 5 embedded therein, the metal thin film layer 9, the separation layer 11, and the concealment layer 1 are provided.
3 and the transparent protective layer 15 are sequentially laminated. The metal base material 3 has a predetermined supporting strength and conductivity, and in this embodiment, is made of a copper plate having a thickness of 150 μm. The thickness of the metal base material 3 is not particularly limited as long as the required strength can be obtained.
Further, the material of the metal base material 3 may be made of, for example, aluminum as long as it has supporting strength and conductivity.

The dielectric layer 7 is made of glass epoxy resin having a thickness of 100 μm, and the SAW element 5 is embedded in the central portion of the dielectric layer 7. still,
Other materials for the dielectric layer 7 include high-dielectric constant resins such as polyethylene terephthalate (PET), synthetic resins such as epoxy resin and polycarbonate, aromatic polyamide (aramid), polyethylene, polystyrene,
Pyrex glass, synthetic paper, or a ceramic flat plate can also be used.

The metal thin film layer 9 is formed to a thickness of about 1 μm by depositing aluminum.
By etching the metal thin film layer 9 as shown in FIG.
The receiving and transmitting MSA (microstrip antenna) 17, 19 shown in FIG. These MSA
As shown in FIG. 1, the reference numerals 17 and 19 are formed by etching the deposited metal thin film layer 9 into the shape shown in FIG. Connected to the electrodes. Also, M
The antenna dimensions of SA17 and SA19 are determined by the thickness t of the conductive film (metal film), the relative permittivity εx and the thickness h of the dielectric layer 7. With the antenna size in this embodiment, when the input signal frequency f is 2 GHz, it is about 33 mm (h
= 0.1 mm, εx = 5). Further, when the metal thin film layer 9 is vapor-deposited, the metal thin film layer 9 is not formed and the void layer 21 is formed at a position facing the surface of the SAW element 5. The thickness of the metal thin film layer 9 is preferably 0.
The thickness is 5 to 2 μm, and the material can be a simple metal such as gold, silver, or copper, or an alloy. Further, in forming the thin film, a metal foil having the same performance as described above may be attached and ultrasonically bonded to an IDT electrode (comb-shaped electrode) of SAW (surface acoustic wave) instead of vapor deposition.

The separation layer 11 is formed of an acrylic flat plate having a thickness of 100 μm, and a window portion 11a formed by embedding a transparent glass flat plate is provided at a position of the acrylic flat plate facing the SAW element 5. Has become
The window portion 11a made of this glass flat plate forms the void layer 21 on the front surface side of the SAW element 5. The separation layer 11
The thickness is not particularly limited as long as the required strength is obtained. Further, as the material of the window portion 11a, as long as it has mechanically supportable strength and can transmit laser light,
Any material can be used, and for example, the same material as the dielectric layer 7 and the protective layer 15 described later can be used.

The concealing layer 13 is made of a material having a high transmittance for infrared rays, which is the wavelength range of a semiconductor laser, and an appropriate opacity for visible light. In this embodiment, as this material, there is used a mixed-colored smear in which yellow, magenta, and cyan pigments are mixed, and the hiding layer 1
A method such as providing a pattern print on the surface of 3 may be used.
When the hiding layer 13 is composed of the mixed stain or the like, it is formed by applying the mixed stain or the like on the separation layer 11 and drying. At this time, the thickness of the hiding layer 13 is 0.5 μ
m to 5 μm, preferably 1 μm to 3 μm.

The transparent protective layer 15 which covers the concealing layer 13 is
Made of polyvinyl chloride to a thickness of 6 μm to 200 μm, preferably 10 μm to 150 μm,
In this embodiment, it is set to 70 μm. Other materials for the protective layer 15 include wear resistance and heat resistance such as polyethylene terephthalate (PET), polyamide, polycarbonate, cellulose ester, fluorinated polymer, polyacetal, polyolefin, polyimide, aramid, polyacetal, and fluororesin. The material which it has is used.

In the laminated card 1 having the above structure, the concealing layer 13 may not be provided depending on other forms.
If necessary, a printing layer or the like may be provided on the surface of the transparent protective layer 15 in order to form a visible image.

Next, the SAW element 5 embedded in the dielectric layer 7 will be described. The SAW element 5 includes a substrate, a piezoelectric film provided on the surface of the substrate, and a SAW (surface acoustic wave) excitation formed on the surface of the piezoelectric film as shown in FIGS. 3 and 5. The input electrode 23 and the output electrode 25 are composed of metal electrodes, and the SAW is a Rayleigh wave. In this embodiment, a sapphire substrate can be used as the substrate, and quartz, glass, diamond, etc. can be used. Particularly, in the case of diamond, it has a high sound velocity of 10 km / sec or more. It is suitable for The piezoelectric film is formed by sputtering a film of aluminum nitride (AIN) on the surface of the sapphire substrate. Other materials for the piezoelectric film formed on the substrate include ZnO, LiNb3,
LiTaO3, α-Al203, etc. are used.

The input electrode 23 of the SAW element 5 is shown in FIG.
, The output electrode 25 is connected to the transmitting MSA 19 via the terminal 19a, and the input electrode 23 has two pairs of comb-shaped segments. The output electrode 25 is configured by combining four pairs of comb-shaped segments. Then, for the input electrode 23 and the output electrode 25, each comb-shaped electrode pattern is formed on the surface of the piezoelectric film by ion beam sputtering of about 2000 Å of aluminum, and then by general photolithography. Input electrode 2
The input terminal 17a connected to the output terminal 3, the output terminal 19a connected to the output electrode 25, and the common terminal 27 are formed at the same time. In addition, the input electrode 23 and the output electrode 25
The electrode interval between and is determined by the frequency of the surface acoustic wave which is a Rayleigh wave, that is, the input signal frequency f and the sound velocity characteristic Vs of the material of the SAW element 5. For example, when Vs is 10 km / sec, the surface acoustic wave is Has a wavelength λ of 5 μm, and the electrode interval is set to an integral multiple of the wavelength λ of the surface acoustic wave.

Here, the principle of the SAW element 5 having the above structure will be described. First, the MSA (microstrip antenna) 17, 19 will be described. MSA 17, 19
Is formed by etching a circular or square open-type planar circuit resonant element on a printed circuit board with a thin copper foil.
It is used as a radiator of radio waves (latest planar antenna technology, Haneishi operation and inspection, issued by General Technology Center). The MSAs 17 and 19 are usually formed to have a size of about a half wavelength of radio waves to be transmitted and received, and a main mode (basic mode) is used as a test excitation mode. Also,
Among such MSAs 17 and 19, there is a circular polarization type MSA (microstrip antenna) that does not depend on the angle of the rotation direction of the antenna, and as a method of generating circular polarization, it is roughly classified into a two-point feeding method and a 1-point feeding method. There is a point feeding system.

The two-point feeding system is in principle equivalent to the circularly polarized wave generating system applied to a normal linear antenna such as a cross dipole. Since the 1-point feeding system can generate circularly polarized waves without using a phase adjusting circuit such as a 3 dB hybrid in the feeding system, the configuration of the feeding system is extremely simple and can be made smaller than the 2-point feeding system. There is. In addition, there are two types of right-handed antennas and ones for left-handed antennas in this system. In this embodiment, one is used for reception and the other is used for transmission.

Next, the general principle of the SAW matched filter using the SAW element 5 will be described. SAW
The SAW device including the element 5 uses a surface acoustic wave that propagates along the surface of an elastic body, and is used as, for example, a delay line, a filter, a resonator, an oscillator, or the like.
The propagation velocity of the surface acoustic wave propagating through this SAW device is generally extremely slow, about 1 / 100,000 of the electromagnetic wave, and the surface acoustic wave propagates on the surface of the SAW element 5 at a depth of about one wavelength. Of the SAW element 5 can be driven and detected at any position in the SAW element 5, and the SAW element 5 can be reduced in size and weight.
It can be used in the range from 1 to several GHz. Due to these features, a highly accurate transversal filter is possible, and a typical practical example of a SAW device is a TV SAW IF filter. This SAW filter
Comb-shaped metal electrodes are formed by photolithography, vapor deposition, sputtering, etc. on a piezoelectric substrate such as quartz, lithium niobate, or lithium tantalate. Operationally, on the extension line of this SAW IF filter for TV SAW matched filters can be considered.

The SAW matched filter is a special example of the transversal filter, and its principle diagram can be constructed as shown in FIG. In FIG. 4, D _n-1 (n
= 1, 2, ..., N) represents a delay circuit, and Wn (n =
1, 2, ..., N) denote weighting circuits. Also, SA
As shown in FIG. 5, the W element 5 is composed of a dielectric substrate for propagating surface acoustic waves and a transducer (converter) for converting energy between an electric signal and an elastic wave. The transducer is composed of an input electrode 23 and an output electrode 25 formed in a comb pattern,
The input electrode 23 operates as a transducer that converts an electric signal into a surface acoustic wave, and the output electrode 25 operates as a transducer that converts a propagated surface acoustic wave into an electric signal. In this case, the input electrode 23 operates as a converter that converts a broadband electric signal into a surface acoustic wave,
When a high frequency signal is input to the input electrode 23, elastic waves are generated in the left and right directions on the surface of the piezoelectric body. Then, in this embodiment, as shown in FIG. 5, the input electrode 23 is formed as a comb-shaped electrode including two segments, and the output electrode 25 is formed as a comb-shaped electrode including four segments.
4 corresponds to the delay circuit shown in FIG. 4, and the cross width of the adjacent comb electrodes corresponds to the weighting circuit shown in FIG.

FIG. 5 shows BPSK (Bi-Phase Sh).
if Keying (DS) modulated (Direct)
An example of a SAW matched filter for signal detection of the SS) system is shown. In FIG. 5, 23 is an input electrode and 25 is an output electrode.
It is a wide band transducer for converting, and the output electrode 25
Is an output transducer in which an electrode pattern is formed so as to correspond to the phase pattern of the target signal.

In the laminated card 1 provided with the SAW element 5 as described above, when the target signal pattern transmitted from the reading device (not shown) is received by the receiving MSA 17, it is input to the input electrode 23 as an electric signal and input. It is converted into a surface acoustic wave by the electrode 23. The surface acoustic wave propagates on the delay circuit formed by a series of comb-shaped electrode pairs of the output electrode 25, and at the output electrode 25, the input surface acoustic wave signal pattern and the weighting pattern of the output electrode 25 match. Sometimes peak output is obtained. The peak output signal is returned to the reader by radiating radio waves as individual information by the transmitting MSA 19. Then, the individual information returned from the transmitting MSA 19 is read by a reading device, and in this reading device, it is confirmed whether the individual information matches the individual information recorded in the weighting pattern and the target signal, and the laminated card One individual information pattern is detected. Therefore, the individual information can be identified, and neither carrier synchronization nor code synchronization is required, so that the data can be identified very easily and reliably.

Next, a case of manufacturing the laminated card 1 having the above-mentioned structure will be described. To make a laminated card 1,
First, as shown in FIG. 6, the SAW element 5 in which the comb-shaped input electrode 23 and output electrode 25, the common terminal 27, the input terminal 17a, and the output terminal 19a are formed is shown in FIG.
As shown in (a), it is adhered onto the metal base material 3 and the common terminal 27 is soldered to the metal base material 3. Furthermore, FIG.
As shown in (b), the dielectric layer 7 is mounted on the metal base material 3 so that the SAW element 5 is embedded in the central portion.

Next, after fixing the dielectric layer 7, as shown in FIG.
As shown in (c), a metal thin film layer 9 is vapor-deposited on the dielectric layer 7, and a resist R is further formed on the metal thin film layer 9 as shown in FIGS. 7 (c) and 8 (a). Apply, then
By exposing and removing the unnecessary portions by etching, as shown in FIGS. 7D and 8B, the MSA 17, 19 for receiving and transmitting the one-point feed type circularly polarized wave is formed. After that, as shown in FIG. 7E, the window portion 11a forming the void portion 21 on the circuit surface of the SAW element 5 is formed.
The separation layer 11 provided with is bonded onto the metal thin film layer 9.
Further, as shown in FIGS. 7 (f) and 8 (c), a hiding layer 13 is applied thereon, and as shown in FIG. 7 (g),
A transparent abrasion-resistant protective layer 15 is adhered thereon.

By performing the same processing on the other surface of the metal base material 3, the laminated card 1 having the same individual information on both surfaces is formed, and the SAW element 5 is formed on both surfaces of the laminated card 1. Since the card 1 is provided, it can be read by communication regardless of the front and back of the card 1.
It should be noted that the individual information provided on both sides is not the same information, but the data pattern may be intentionally changed and recorded.

Next, a case where individual information is recorded on the laminated card 1 manufactured by the above process by laser irradiation will be described. First, an unnecessary portion of the comb-shaped information output electrode 25 of the SAW element 5 provided on the laminated card 1, that is,
The trimming part 31 which is one end of the comb shape shown by X in FIG.
As shown in FIG. 10, the focused laser beam 33 is radiated from the window portion 11a, and the trimming portion 31 of the comb-shaped metal electrode is melted by the radiation heat to form a hole in the metal thin film. Done. In this case, the molten metal is in a state where small metal particles called ball-up are aggregated due to the surface tension. In the output electrode 25, as shown in FIG. 9, the comb-shaped unnecessary trimming portion 31 is melted and cut by the laser beam 33 based on each information pattern, so that the laminated card 1 is individually separated as shown in FIG. An information pattern corresponding to the information is formed, and is thereby recorded as data of the fixed code SAW matched filter. The pattern of the input electrode 23 is formed in the pattern shown in FIG. 9 from the forming step.

In the laminated card 1 like this, the transmission signal transmitted from the reading device is the MS for reception.
The signal received by A17 is transmitted to the input electrode 23 of the SAW element 5 as an electric signal,
3 is converted into a surface acoustic wave by the piezoelectric effect of the SAW element 5 and propagates to the output electrode 25.
Is detected as an electric signal by the transmitting MSA 19 and is returned to the reader from the transmitting MSA 19 to be read by the reader to detect an individual information pattern of the laminated card 1.

Therefore, in this embodiment, since the operation is performed by receiving the electromagnetic wave from the reading device by the surface acoustic wave element MSA 17, the dedicated battery is not required. Further, since the individual information is recorded on the laminated card 1 using the MSA 17 and 19 and the fixed code matched filter, the synchronization is not necessary for reading the individual information and the information can be read in a non-contact manner. It becomes unnecessary to insert the information recording medium into the reading device at the time of reading, and the reading operation becomes simple. Furthermore, the metal substrate 3
Since the SAW elements 5 are provided on both surfaces of the laminated card 1, it is possible to read by communication regardless of the front and back of the laminated card 1.

Furthermore, since the MSAs 17 and 19 are provided, the reception sensitivity does not change depending on the angle direction of the antenna, and moreover, the MSAs 1 for transmission and reception are provided on both sides.
By providing 7 and 19, the directivity can be further widened, and as a result, communication in any direction becomes possible.
In addition, the infrared absorption layer is irradiated with a heat beam of the laser beam 33 through the protective layer 13 that transmits infrared rays to melt unnecessary portions of the comb-shaped metal electrode, thereby recording an information pattern. In contrast, the protective layer 13 can be thickened, and the durability and strength of the laminated card 1 which is the laminated information recording medium can be secured.

Furthermore, when recording individual information on the output electrode 25 of the SAW element 5, all matching codes are written in the phase of the electrode array by trimming of the output electrode 25, so that additional writing becomes impossible. Even if additional writing is performed, the laminated card 1 itself becomes unusable, and it becomes difficult to restore the electrodes. As a result, it is possible to reliably prevent additional writing and falsification of information recording. Further, a concealing layer 13 and a printing layer which are transparent to infrared rays are provided between the metal thin film layer 9 of the laminated card 1 and the transparent protective layer 15, and the protective layer 15 is further provided.
By printing visual information on the surface of the metal thin film layer 9
It becomes possible to make the information recorded on the optical disc unreadable by visible light, and as a result, it becomes impossible to visually recognize the information and almost impossible to read the recorded pattern.

Next, another embodiment of the present invention will be described. FIG. 11 is a plan view showing an input electrode and an output electrode of the SAW element before forming the information pattern of this embodiment, and FIG.
13A to 13G are vertical cross-sectional views sequentially showing the process of forming the information pattern, and FIGS. 13A to 13C are plain views for explaining the process of forming the microstrip antenna.

In this embodiment, the SAW element 5 whose surface acoustic wave is a Stoneley wave is applied, and instead of the separation layer 11 provided between the metal thin film layer 9 and the concealment layer 13, an infrared absorption layer. 35 is provided and the void layer 21 is unnecessary. That is, the laminated card 1 of the present embodiment has SAW on both sides of the metal base 3 as shown in the figure.
The dielectric layer 7 provided with the element 5, the metal thin film layer 9, the infrared absorbing layer 35, the hiding layer 13, and the transparent protective layer 15 are
It has a structure in which layers are sequentially stacked. This Stoneley wave is a boundary wave that propagates by concentrating energy on the boundary surface where two solids are joined. In this case, the boundary surface is SA
The surface of the W element 5 is in contact with the infrared absorption layer 35.

Next, a case of manufacturing the laminated card 1 having the above structure will be described. In order to manufacture the laminated card 1 of this embodiment, first, as shown in FIG. 11, the comb-shaped input electrode 23 and output electrode 25, the common terminal 27, the input terminal 17a, and the output terminal 19a were formed. As shown in FIG. 12A, the SAW element 5 is bonded onto the metal base material 3 and the common terminal is soldered to the metal base material 3. Further, as shown in FIG. 12B, the SAW is formed on the metal base material 3.
The dielectric layer 7 is adhered so that the element 5 is located and embedded in the central portion. Next, after fixing the dielectric layer 7, as shown in FIG.
As shown in FIG. 13C, a metal thin film layer 9 is vapor-deposited on the dielectric layer 7, and as shown in FIG. 13A, the MSA 17 for reception and the MSA 19 for transmission are formed on the metal thin film layer 9. Is coated with a resist R, then exposed, and unnecessary portions are removed by etching to form single-point feed type circularly polarized MSAs 17 and 19 as shown in FIGS. 12 (d) and 13 (b). . Then, as shown in FIG.
Infrared absorbing layer 35 is applied to the surface of, and as shown in FIGS. 12 (f) and 13 (c), hiding layer 13 is applied on this infrared absorbing layer 35, and as shown in FIG. 12 (g). To
A transparent abrasion-resistant protective layer 15 is adhered thereon.

The infrared absorbing layer 35 is composed of an infrared absorbing exothermic agent and a binder. As the infrared absorbing exothermic agent, a polymethine type cyanine dye is used, and as other materials, an azo type dye and a naphthoquinone type are used. Or anthranone-based quinone-based dyes may be used. As the binder, polyester resin, ethyl cellulose, methyl cellulose, cellulose acetate, hydroxyethyl cellulose, cellulose resin such as hydroxypropyl cellulose, polyvinyl alcohol, polyvinyl acetate, polyvinyl butyral, polyvinyl acetal, polyacrylamide and other vinyl resins, poly Acrylic resins such as methyl acrylate and polyacrylic acid, polyolefins such as polyethylene and polypropylene, polyacrylate resins, epoxy resins and phenol resins can be used. In this example, a solvent containing 2% by weight of a senior dye, 70% by weight of a solvent, and 28% by weight of a polyester resin was applied onto a metal thin film and dried to apply a film having a thickness of 0.5 μm to 5 μm. It is formed on the film. It is preferably 1 μm to 3 μm.

The information pattern is recorded by focusing the laser beam 33 from the transparent protective layer 15 of the laminated card 1 onto the infrared absorbing layer 35 and irradiating the laser beam 33, and the laser irradiating the infrared absorbing layer 35. The beam 33 is absorbed by the infrared absorbing heat generating agent contained in the infrared absorbing layer 35, converts light energy into heat energy, and this heat melts the metal layer to form an information pattern. In this case, the metal thin film layer 9 and the transparent protective layer 15 of the laminated card 1 are
And a hiding layer 13 transparent to infrared rays and ultraviolet rays
Or a print layer may be provided, and the visual recognition information may be printed on the surface of the transparent protective layer 15.

In this embodiment, since the SAW element 5 whose surface acoustic wave is Stoneley wave is used, the infrared absorption layer 35 is used instead of the separation layer 11 provided between the metal thin film layer 9 and the concealment layer 13. It is possible to eliminate the need for the air gap layer 21 only by providing the above. Further, by providing the infrared absorbing layer 35, it is possible to improve the laser energy effect for irradiation and reduce the power of the laser light source.

In the above embodiment, circularly polarized MSA
Although the case where 17 and 19 are of the one-point feeding type has been described, the same effect can be obtained even if the two-point feeding type of circularly polarized MSA 17 and 19 is used.

[0055]

As described above, according to the present invention, since the operation is performed by receiving the electromagnetic wave from the reading device at the input electrode of the surface acoustic wave element, a dedicated battery is not required. Further, since the individual information is recorded on the information recording medium by using the microstrip antenna and the fixed code matched filter, the synchronization for reading the individual information is not necessary and the information can be read in a contactless manner. It becomes unnecessary to insert the information recording medium into the reading device at the time of reading, and the reading operation becomes simple. Further, since the surface acoustic wave elements can be provided on both sides of the metal base material, the information recording medium can be read by communication regardless of the front and back sides.

In addition, since the microstrip antenna is provided, the receiving sensitivity does not change depending on the angle direction of the antenna. Moreover, the directivity can be further expanded by providing the transmitting and receiving antennas on both sides. As a result, communication in any direction becomes possible. In addition, the infrared absorption layer is irradiated with a heat beam by a laser beam through a protective layer transparent to infrared rays to melt the metal thin film layer, whereby an information pattern is recorded,
Unlike the past, it is possible to thicken the protective layer,
The durability and strength of the laminated information recording media can be ensured.

Furthermore, when recording individual information on the output electrodes of the surface acoustic wave device, all the matching codes are written in the phase of the electrode array by trimming the output electrodes, so that additional writing becomes impossible. For example, additional writing is possible. However, the information recording medium itself becomes unusable, and it becomes difficult to restore the electrodes, and as a result, it is possible to reliably prevent additional recording and falsification of the information recording. Further, by providing a concealing layer or a printing layer transparent to infrared rays between the metal thin film layer of the information recording medium and the transparent protective layer, and further by printing visual information on the surface of the protective layer, the metal thin film layer It becomes possible to prevent the information recorded in the above from being read by visible light, and as a result, it becomes impossible to visually recognize the information and it becomes difficult to read the recorded pattern.

Further, in the surface acoustic wave device in which the surface acoustic wave is a Stoneley wave, an infrared absorbing layer is provided in place of the separation layer provided between the metal thin film layer and the concealing layer, so that the laser energy for irradiation is radiated. Improve the effect,
It is possible to obtain the effect that the power of the laser light source can be reduced.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view showing a laminated structure of a laminated card according to an embodiment of the present invention.

FIG. 2 is a plan view showing a microstrip antenna of a laminated card.

FIG. 3 is a plan view showing an input electrode and an output electrode of the SAW element.

FIG. 4 is a circuit diagram showing an equivalent circuit of a SAW matched filter.

FIG. 5 is a perspective view showing an input electrode and an output electrode provided in the SAW element.

FIG. 6 is a plan view showing an input electrode and an output electrode of a SAW element before forming an information pattern.

7A to 7G are vertical cross-sectional views sequentially showing steps of forming an information pattern.

FIGS. 8A to 8C are plan views illustrating a process of forming a microstrip antenna.

FIG. 9 is a plan view illustrating a step of forming an information pattern on an output electrode of a SAW element by using a laser beam.

FIG. 10 is a vertical cross-sectional view illustrating a step of forming an information pattern on the output electrode of the SAW element with a laser beam.

FIG. 11 is a plan view showing an input electrode and an output electrode of a SAW element before forming an information pattern according to another embodiment of the present invention.

12A to 12G are vertical cross-sectional views sequentially showing steps of forming an information pattern.

13 (a) to 13 (c) are plan views illustrating a process of forming a microstrip antenna.

FIG. 14 is a plan view showing a magnetic card according to a conventional example.

15 is a cross-sectional view taken along the line AA in FIG.

FIG. 16 is a vertical cross-sectional view showing a magnetic card according to a conventional example.

FIG. 17 is a perspective view of a magnetic card shown by partially crushing it.

[Explanation of symbols]

 1 Information Recording Medium 3 Metal Substrate 5 Surface Acoustic Wave Element (SAW Element) 7 Dielectric Layer 9 Metal Thin Film Layer 11 Separation Layer 11a Window 13 Concealment Layer 15 Protective Layer 17 Microstrip Antenna for Reception 17a Antenna Terminal 19 Micro for Transmission Strip antenna 19a Antenna terminal 23 Input electrode 25 Output electrode 35 Infrared absorbing layer

(72) Inventor Tomio Ando 1-5-1 Taito, Taito-ku, Tokyo, Toppan Printing Co., Ltd. In the company

Claims (9)

[Claims] 1. An information recording medium which receives an electromagnetic wave from a reading device, returns individual data by the electromagnetic wave, and can be read in a non-contact manner, wherein surface acoustic waves are present on at least one surface of a metal base material. A dielectric layer in which a surface acoustic wave element that is a Rayleigh wave is embedded, a metal thin film layer provided on the surface of the dielectric layer excluding the surface acoustic wave element, and an elastic surface provided on the metal thin film. A separation layer having a window portion forming a void on the surface of the wave element, a concealment layer provided on the separation layer for concealing recorded information provided on the surface acoustic wave element, and provided on the concealment layer An information recording medium, wherein the transparent protective layer and the transparent protective layer are sequentially laminated. 2. An information recording medium which receives an electromagnetic wave from a reading device, returns individual data by the electromagnetic wave, and is readable without contact, wherein surface acoustic waves are provided on both surfaces of the metal base material. A dielectric layer in which a surface acoustic wave element that is a Rayleigh wave is embedded, a metal thin film layer provided on the surface of the dielectric layer excluding the surface acoustic wave element, and an elastic surface provided on the metal thin film. A separation layer having a window portion forming a void on the surface of the wave element, a concealment layer provided on the separation layer for concealing recorded information provided on the surface acoustic wave element, and provided on the concealment layer An information recording medium, wherein the transparent protective layer and the transparent protective layer are sequentially laminated. 3. The receiving and transmitting microstrip antennas independently formed on the metal thin film layer by vapor deposition and etching, respectively, and the antenna terminals of the receiving and transmitting microstrip antennas, respectively. The information recording medium according to claim 1 or 2, wherein the input and output electrodes of the surface acoustic wave element are connected to each other during the vapor deposition to form a data transmitting and receiving circuit. 4. The transmission / reception circuit operates only with reception power and does not require a battery for power supply, and the reception circuit has a BPS.
The K-modulated DS system signal is received, and the transmission circuit
4. A fixed code matched filter which outputs a burst signal when the received codes match.
Information recording medium described. 5. The information recording medium according to claim 1, wherein visible information such as a visible pattern is formed on the surface of the transparent protective layer by printing or another method. 6. An information recording medium which receives an electromagnetic wave from a reading device and returns individual data by the electromagnetic wave so that the data can be read in a non-contact manner. A surface acoustic wave is provided on at least one surface of a metal base material. A dielectric layer in which a surface acoustic wave element that is a Stoneley wave is embedded, a metal thin film layer provided on the surface of the dielectric layer excluding the surface acoustic wave element, and provided on the surface of the surface acoustic wave element An infrared absorbing layer, a hiding layer provided on the infrared absorbing layer for hiding recorded information recorded in the surface acoustic wave device, and a transparent protective layer provided on the hiding layer, which are sequentially laminated. An information recording medium characterized by being formed by. 7. The information recording medium according to claim 6, wherein visual information such as a visible pattern is formed on the surface of the transparent protective layer by printing or another method. 8. A concealing layer formed by printing or the like that transmits infrared rays and ultraviolet rays is provided between the metal thin film layer and the transparent protective layer to conceal the circuits formed on the surface acoustic wave element and the metal thin film layer. The information recording medium according to claim 6 or 7. 9. A dielectric layer in which a surface acoustic wave element is embedded on at least one surface of a metal base material, a metal thin film layer provided on the surface excluding the surface acoustic wave element, and a surface of the surface acoustic wave element. An information recording method for an information recording medium in which a separation layer or an infrared absorbing layer having a window portion forming a void portion, a concealing layer for hiding recorded information recorded in the surface acoustic wave, and a transparent protective layer are sequentially laminated. An information recording method for an information recording medium, wherein the input electrode and the output electrode of the surface acoustic wave element are adapted to record individual information by a heat beam such as a laser beam.