JPH10198259A - Optical recording medium - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide the optical recording medium which makes it possible to record much information and is hardly forged or used illegally. SOLUTION: An image is represented as a hologram, whose data is used to drive an electron beam exposure device and precisely draw interference fringes of the hologram on a recording medium with an electron beam; and this recording medium is etched and plated to form an original plate of an optical recording medium and this original plate is used to duplicate an optical recording medium 26. A reflecting film has areas 29 facing an individual or plural recording area 28, they are arranged covering the entire two-dimensional image area of an individual recording area, and respective area of the reflecting film is not successive to, but independent of an adjacent area of the reflecting film or not exposed. Consequently, this medium is made hard to forge by exposing the uneven surface of the hologram by dissolving the reflecting film.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to an optical recording medium, and more particularly to an optical recording medium suitable for a prepaid card, a credit card, a cash card, and the like.

[0002]

2. Description of the Related Art Current prepaid cards, credit cards, cash cards, and the like have a magnetic recording portion called a magnetic stripe as recording means, and have a balance and an ID (identification) number for confirming the identity of the person if necessary. The record is recorded, and the record such as the balance is changed with the use of the card in the prepaid card. Such a card as a recording medium is convenient to carry and does not involve cumbersome cash transfer, and contributes to a so-called cashless society. On the other hand, in such a card, since the recording medium is a magnetic recording layer,
The recorded contents can be easily read, and therefore, forgery is easy. For this reason, telephone cards and prepaid cards of pachinko parlors are frequently forged or illegally used, which has become a social problem.

[0003]

In order to cope with such forgery and unauthorized use, complicated magnetic recording systems and IC cards have been proposed in place of conventional simple magnetic recording systems, but the cost is high. However, it has not been widely used. Further, those using a diffraction grating or a hologram as optical recording are disclosed in JP-A-3-71383, JP-A-5-73738, and JP-B-7-9738.
No. 8 has been proposed. These are for judging whether or not the reflection intensity of light on the hologram is a predetermined value (or not less than a predetermined value), and for detecting the reflected light as a plurality of different optical paths by a diffraction grating or a hologram. Yes, it helps to identify whether the card is legitimate (genuine) or counterfeit, but to record other complex information, such as the value of prepaid cards, PINs and card numbers on cash cards, etc. If it is not suitable, and if it is attempted to record using the technique of the above-mentioned publication, not only the manufacture of the card but also a device for reading the information (reader) becomes considerably complicated and extremely expensive, so that it is considered difficult to realize.

Accordingly, it is an object of the present invention to provide an optical recording medium which can record a large amount of information and is difficult to forge or illegally use.

[0005]

According to the present invention, an image is represented as a hologram, an electron beam exposure apparatus is driven using the data, and the interference fringes of the hologram are precisely recorded on a recording medium by the electron beam. The recording medium is etched to produce a master of an optical recording medium. Using the master, a plurality of recording areas showing interference fringes of a hologram by replication and a plurality of independent recording areas corresponding to the plurality of recording areas. The optical recording medium is manufactured by providing a region or a structure in which the protective layer and the substrate are in close contact over the entire circumference of the optical recording medium so that the reflection film is not exposed to the outside.

That is, according to the present invention, in an optical recording medium having a substrate and a plurality of recording areas and a reflective film on a recording layer formed on the substrate, each of the recording areas is used to record a two-dimensional image to be recorded. This is a copy of the one obtained by drawing the corresponding hologram interference fringes with an electron beam.
The reflective film has a plurality of areas facing each or a plurality of the recording areas, and is arranged so as to cover the entire two-dimensional image area of the individual recording area, and each area of the reflective film is adjacent to the reflective area. An optical recording medium is provided which is independent of and independent of a film area.

According to the present invention, in an optical recording medium having a substrate and a plurality of recording areas and a reflective film on a recording layer formed on the substrate, each of the recording areas stores a two-dimensional image to be recorded. The data obtained by digitizing the read data is subjected to arithmetic processing, data representing the interference fringes of the hologram is provided to an electron beam exposure apparatus, the medium to be exposed is exposed by scanning with an electron beam, and drawing is performed, and the medium to be exposed is etched. And the reflection film has a plurality of areas facing each or a plurality of the recording areas, and covers the entire two-dimensional image area of each of the individual recording areas. An optical recording medium is provided, wherein each area of the reflective film is arranged so as to be independent of an adjacent area of the reflective film.

According to the present invention, in an optical recording medium having a substrate and a plurality of recording areas and a reflective film on a recording layer formed on the substrate, each of the recording areas corresponds to a two-dimensional image to be recorded. An interference fringe of a corresponding hologram is obtained by drawing with an electron beam, and the reflection film has a plurality of regions facing each or a part of the recording area, and the individual The optical recording medium is provided so as to cover the whole of the two-dimensional image area of the recording area, and that each area of the reflective film is not continuous and independent of an adjacent area of the reflective film. .

Further, according to the present invention, in an optical recording medium having a substrate and a plurality of recording areas and a reflective film on a recording layer formed on the substrate, each of the recording areas stores a two-dimensional image to be recorded. The data obtained by digitizing the read data is subjected to arithmetic processing, data representing the interference fringes of the hologram is provided to an electron beam exposure apparatus, the medium to be exposed is exposed by scanning with an electron beam, and drawing is performed, and the medium to be exposed is etched. And the reflection film has a plurality of areas facing each or a part of the recording area, and a two-dimensional image area of the individual recording area. There is provided an optical recording medium which is arranged so as to cover the entirety, and wherein each region of the reflection film is independent of a region of an adjacent reflection film without being continuous.

According to the present invention, in an optical recording medium having a substrate and a plurality of recording areas, a reflective film and a protective layer on a recording layer formed on the substrate, each of the recording areas has a recording area. A hologram interference fringe corresponding to the three-dimensional image is obtained by drawing an interference fringe pattern by an electron beam. The reflection film has a region facing a plurality of the recording areas, and the reflection film is external. An optical recording medium, wherein the optical recording medium is located between the protective layer and the substrate so as not to be exposed to the substrate, and the protective layer and the substrate are in close contact over the entire circumference of the optical recording medium. You.

[0011]

Embodiments of the present invention will be described below with reference to the drawings, together with preferred embodiments. FIG. 1 is a plan view of a first embodiment of the optical recording medium according to the present invention. Although there are various uses of the optical recording medium of the present invention, the embodiment will be described here as a card-type prepaid card 26. A plurality of recording areas 28 are provided and arranged on the prepaid card 26. Now, it is assumed that character information is recorded in each of the recording areas 28. FIG. 2 is a cross-sectional view of the optical recording medium of FIG. 1 taken along the line II-II.
The figure shows a recording area 28 provided in the recording layer, a plurality of areas 29 of the reflection film, and a protective layer 31. FIG. 1 and other similar plan views show the optical recording medium 2.
6, the recording area 28 is indicated by a solid line, and each area 29 of the reflection film is indicated by a dotted line. As the substrate 27, for example, polycarbonate or the like can be used. Further, as the protective layer 31, for example, a UV polymer coat or the like can be used.

FIG. 3 is a block diagram showing an apparatus and steps for manufacturing the optical recording medium 26 of FIG. Now, assuming that character information including numbers is recorded on the prepaid card 26 to be manufactured, a signal of the character information is input to the input terminal IN.
1 and input to the image signal conversion circuit 10. The image signal conversion circuit 10 converts a character represented by the code information of the input digital signal into an image signal of a two-dimensional image dot pattern (input data in FIG. 4).

This image signal is supplied to a numerical operation device 14 via a switch 12 or a multiplexer. The numerical operation device 14 obtains a numerical value for obtaining an interference fringe pattern of a hologram (holographic interferogram) without irradiating interference light from an image signal of a dot pattern of a two-dimensional image using a predetermined algorithm. FIG. 4 schematically shows this state. Preferably, a computer capable of high-speed operation is used as the numerical operation device. Deriving a hologram interference pattern corresponding to the two-dimensional image data, that is, a wavefront shape by calculation is known as a so-called CGH (Computer Generated Hologram).

The numerical operation device 14 is configured to output coordinate data according to the resolution of an electron beam exposure device 18 which is a drawing device described later. Before actually performing drawing, coordinate data obtained by numerical operation is fed back and compared with input data, and recalculation is performed a plurality of times to reduce an error between the two. An output signal of the numerical operation device 14 is converted into a signal of a predetermined format by the encoder 16 and input to the electron beam exposure device 18. The electron beam exposure apparatus 18 is originally used to draw a circuit arrangement pattern when manufacturing an IC or LSI, and here, the interference fringe pattern (output data) shown in FIG. 20 is used to draw on. The primary recording medium 20 is referred to as a primary recording medium 20 in order to distinguish it from the optical recording medium 26 as a final product. 1
As the next recording medium 20, as shown in FIG. 5B, a substrate such as glass 30 coated with a photoresist 32 which is a photosensitive resin as a medium to be exposed is used. The primary recording medium 20 is a stepper 22 (stage controller)
And the stepper 22 is mounted on the electron beam exposure apparatus 1.
8 on the plane perpendicular to the electron beam 34
It can move in two directions of Y. It should be noted that drawing with an electron beam makes it possible to draw an extremely delicate and precise pattern as compared with drawing with a laser beam used in the production of a conventional optical recording medium. It can be said that it is suitable.

Now, assuming that data consisting of 300 English characters (including numbers) is to be recorded on a prepaid card, character string data serially input from the input terminal IN1 is sequentially transmitted to the image signal conversion circuit 10. The digital signal is converted into an image signal, subjected to numerical calculation processing by a predetermined algorithm in a numerical calculation device 14, converted into data in a predetermined format by an encoder 16, supplied to an electron beam exposure device 18, and deflected by an electron beam. Then, drawing is performed on the primary recording medium 20. At this time, the electron beam exposure device 18
Controls the stepper 22 so that 300 recording areas 28
In the rows, the primary recording medium 20 is moved in the XY direction on a plane perpendicular to the electron beam 34 so that 100 recording areas are arranged in each row.

As shown in FIG. 1, the completed prepaid card 26 has three rows of recording areas 28 arranged. Each recording area 28 is 250 μm square (A = 250 μm).
m), and the interval between adjacent recording areas 28 in the same row (horizontal row in the figure) is also 250 μm (B> A in FIG. 1).
Where A = B = 250 μm). The interval C between the recording areas 28 in the adjacent row is 5
00 μm. In one recording area 28, an interference fringe pattern of a hologram corresponding to one character is recorded, and information of each recording area is independent.
For example, as shown in FIG. 8, the interference fringe pattern of the same hologram corresponding to the same two-dimensional image is recorded in a plurality of recording areas 44a, 44b, 44c, and 44d arranged adjacent to each other. Can also. FIG.
In the example shown in FIG. 2, 300 recording areas 28 are provided. For example, if one side of a card-shaped optical recording medium having the size of a business card is effectively used, the size of one recording area 28 is set to the same 250 μm square as above, More than one can be provided.

Returning to FIG. 3, when the recording on the primary recording medium 20 is completed, the primary recording medium 20 is removed from the stepper 22, and a known optical recording medium (optical disk) manufacturing step 24 is performed.
, A prepaid card 26 as a final product can be obtained. FIG. 5 is a diagram showing an example of an optical disk manufacturing process including the irradiation of the primary recording medium 20 with the electron beam 34 by the electron beam exposure device 18 and the subsequent etching process, plating process, and the like. The process proceeds with. In FIG. 5, reference numeral 36 denotes a metal plating layer formed on the uneven surface formed on the photoresist 32.
0 is removed and the stamper 36A is attached to the press member 38 as shown by f. Reference numeral 40 denotes a PC resin constituting the optical recording medium main body 40A, which is ejected from the press base 42 in a molten state, and is formed by a pressing step in which the press member 38 relatively approaches the press base 42 as shown in g. Thus, irregularities corresponding to the irregularities of the stamper 36A are formed. After that, the reflection film area 29 corresponds to each recording area 2.
8, and a protective layer 31 is then applied on the reflective film 29. In this embodiment, each area 29 of the reflective film is set to a larger size because each recording area 28 is 250 μm square. As the reflection film 29, for example, an aluminum film can be provided by sputtering.

In the examples shown in FIGS. 1 and 2, the reflection films 29 are provided corresponding to the respective recording areas 28, but need not necessarily correspond one-to-one. For example, a plurality of recording areas 28 are grouped. It is sufficient that a single reflective film region corresponding to the recording area 28 of this group is provided collectively, and as a result, a plurality of reflective film regions are provided independently without being continuous. It should be noted that the stamper 36A may not be manufactured directly from the step e in FIG. 5, but a master disk may be manufactured first, and then a plurality of stampers 36A may be manufactured. If a large number of optical recording media are manufactured, a plurality of stampers 36A may be manufactured. It is necessary to manufacture the stamper 36A.

The primary recording medium 20 is processed as a photomask master, a plurality of secondary recording media are produced from the primary recording medium by light exposure from the photomask master, and an optical disc is formed using the secondary recording medium as the master. It is also possible to manufacture an optical recording medium 26 as a final product through a manufacturing process. FIG. 6 is a diagram showing a manufacturing process using such a photomask master in the order of A to J. According to the method shown in FIG. 6, since the number of exposure steps is increased as compared with the method shown in FIG. 5, the accuracy is slightly lowered, but the method is suitable for copying a large number of secondary masters. FIG. 7 shows another example of a manufacturing process of an optical recording medium using a silicon wafer as a primary master substrate.

The optical recording medium according to the present invention is shown in FIG.
The information is read by a predetermined reader shown in FIGS. 19, 20 and the like. At this time, when the prepaid card 26 is sent in a predetermined direction, and a laser beam or the like as a reference light, which is a coherent light beam, is irradiated on the recording area 28, the recorded original two-dimensional image is projected. That is, when the character “A” shown in FIG. 4 is recorded,
Since this dot pattern is projected at a predetermined position, the original character information can be reproduced by imaging and decoding the image with an image pickup means such as a CCD image pickup device.

In the above description, the case where a character signal is input to the input terminal IN1 of FIG.
May be given an image signal. In this case, the image signal is supplied to the numerical operation device 14 via the switch 12, and the numerical operation is executed in the same manner as described above, so that the data of the interference pattern of the hologram is obtained. By irradiating the prepaid card 26 with a laser beam or the like, the original image can be reproduced. Images to be recorded include logos, barcodes,
Information specifying the owner or issuer of the card, for example, a fingerprint, voiceprint, face photograph, or information indicating that the card is genuine can be recorded.

As shown in FIG. 1, by making each region 29 of the reflection film independent and not continuous with the region 29 of the adjacent reflection film, the following counterfeiting effect is obtained. That is, assuming that the reflection film is a single continuous film and covers the entire two-dimensional area of the optical recording medium 26 in FIG. 1, a counterfeiter who attempts fraud first obtains a genuine prepaid card, This is immersed in a sodium hydroxide solution and left for a while. As a result, the reflection film of aluminum or the like exposed on the side surface of the medium melts, and the entire reflection film melts and disappears, so that the protective layer 31 and the substrate 27 having the recording layer can be separated from each other.

Since the hologram in the recording area is formed by injection molding on the substrate, interference fringes of the hologram are exposed, and it is possible to forge a stamper by applying Ni sputtering or Ni plating. Can be used to forge a prepaid card. According to the configuration of FIG. 1, each region 29 of the reflective film is made independent and not continuous with the region 29 of the adjacent reflective film, so that even if immersed in caustic soda, most of the region 29 of the reflective film is exposed. Therefore, the protective layer 31 is not melted, and the protective layer 31 is almost completely covered with the substrate 2 except for the recording area 28.
7, the protective layer 31 cannot be separated from the substrate 27. The protective layer 31
In order to make it more difficult to separate the substrate 27 from the substrate 27, it is preferable to select a material having a property that both are strongly adhered or adhered when selecting the material of the protective layer 31 and the substrate 27.

Next, a second embodiment of the present invention will be described. FIG. 9 shows a second embodiment of the optical recording medium according to the present invention,
It is the top view seen from the side. The second embodiment differs from the first embodiment in the following points. In other words, not only the respective areas 29 of the reflection film are provided for the recording area 28, but also the areas 29A, 29B, 29C, 29D, 29E of the reflection film having a predetermined pattern are provided in the areas where the recording area 28 is not provided. Is provided. The area of the reflection film is also provided by sputtering a metal such as aluminum. This reflective film area can be visually determined such as numbers and characters as shown in an area 29D, and a fine pattern can be formed using a high-power laser beam such as a CO ₂ laser or a YAG laser. Can be. When displaying numbers or characters, the expiration date of the prepaid card and other use restriction information can be described, and when forming a fine pattern, special figures and patterns etc. should be described This facilitates visual judgment of the forged medium and the authentic medium.

In the optical recording media of the first and second embodiments, as is apparent from the sectional view of FIG. 2, each region 29 of the reflection film is provided between the recording area 28 of the substrate 27 and the protective layer 31. Have been. However, if the reflection film 29 is extremely thin and is formed in close contact with the recording area 28, the hologram unevenness appears on the reflection film 29 itself. In this case, to read the information of the hologram, both a method of irradiating a light beam from the protective layer 31 side and reading the reflected light and a method of irradiating the light beam from the substrate 27 side and reading the reflected light are used. It becomes possible. However, in order to cope with unauthorized use, as shown in FIG. 10, it is necessary to irradiate a light beam not from the protective layer 31 side but from the substrate 27 side and read the reflected light. Hereinafter, this point will be described.

FIG. 10 schematically shows a state in which hologram information is read by a reader.
The laser beam emitted from 5 is a lens 46, a half mirror 4
7, a recording area 28 and a reflection film area 2 behind the recording area 28
9, the reflected light is received by an image sensor 48 such as a CCD, and is recognized as a two-dimensional image. In general, there are two types of reading information from optical recording media: transmission type and reflection type, depending on the method of detecting the light beam. Now, assuming that there is a prepaid card with a transmission type hologram, consider the possibility of unauthorized use. . FIG. 11 shows a normal transmission type reproducing system.
It is conceivable that a thin dummy sheet 35 is stuck on top of this to bring about the state shown in FIG.

The prepaid card is charged for its use by reducing the balance by physically destroying the recording portion of the predetermined amount information. In the optical recording medium according to the present invention, the recording area 28 where the hologram is recorded
Will be destroyed. As a method of physically destroying the recorded portion of the amount information, as shown in FIGS.
Examples include thermal destruction by a thermal head, destruction by a laser beam, destruction by mechanical deformation by a dot impact head, penetration or drilling destruction by a drill bit, and punching destruction by pressing a punch into a die. Of these, destruction by a laser beam (FIG. 14), penetration or drilling by a drill bit (FIG. 16), and punching destruction by pressing a punch into a die (FIG. 17) are effective, but destruction by a laser beam is high. However, it is necessary and expensive, and it is not very practical to perform a piercing or punching breakage by a drill bit or a punching breakage by pressing a punch into a die. Therefore, thermal destruction by a thermal head (FIG. 13) or destruction by mechanical deformation by a dot impact head (FIG. 15) is practical.

Now, thermal destruction by the thermal head (FIG. 1)
3) Assuming that destruction due to mechanical deformation by the dot impact head (FIG. 15) is adopted, FIG.
It is assumed that a transmission type prepaid card to which the second dummy sheet 35 is attached is used. In this case, the data of the hologram is accurately read by the image sensor 48 and used as a genuine prepaid card. Then, at the time of charging, the stage of thermal destruction or mechanical destruction occurs. Since the pressure is applied, the destruction due to thermal or mechanical deformation stops at the dummy sheet 35,
It does not extend to the recording area 28 where the hologram is recorded. At this stage of the destruction, whether or not the destruction has been normally performed is determined by using an image obtained by the image sensor 48. However, since the dummy sheet 35 has undergone thermal or mechanical deformation, this portion is not opaque. At 35 A, a normal two-dimensional pattern cannot be obtained, and it is recognized that the hologram has been destroyed. Therefore, the unauthorized user peels off the broken dummy sheet 35 and attaches a new dummy sheet to the recording area 2 where the hologram is recorded.
8, the prepaid card 26 can be used illegally and repeatedly over and over again.

Although the example shown in FIG. 12 is of the transmission type, even in the case of the reflection type, the reflection film is arranged on the recording medium side from the recording area 28, that is, on the side opposite to the protective layer, and the hologram is placed When trying to read data, a dummy sheet 35 is similarly stuck on the protective layer, so that the recording area 2
The dummy sheet 35 is destroyed in place of the destruction of 8, and it is recognized that the recording area 28 is destroyed.

Therefore, in the present invention, the reflection type is adopted, and the region 29 of the reflection film is formed by the recording layer of the substrate 27 and the protective layer 3.
1, a light beam is irradiated from the substrate 27 side instead of the protective layer 31 side, and the reflected light is applied to the substrate 2 side.
It is configured to take out only from the 7 side. When an unauthorized user attaches a dummy sheet 35 on the protective layer 31 to a prepaid card having such a configuration, the dummy sheet 3
5 is thermally or mechanically damaged, and the recording area 28 in which the hologram is recorded can be prevented from being destroyed. However, since the hologram is detected from the substrate 27 side, the hologram is normally detected even after the dummy sheet 35 is destroyed. Such a two-dimensional pattern is obtained by the image pickup device 48, and therefore, it is not recognized that the destruction of the recording area 28 has been completed, and it is possible to perform processing such as improper use as an unauthorized prepaid card.

Next, a description will be given of a third embodiment of the optical recording medium according to the present invention. In each of the embodiments described so far, the recording area 28 is entirely provided with the reflective film region 29, and the optical recording medium is of a completely reflective type. In the third embodiment, as shown in FIG. 18, the reflective film area 29 is not provided in the entire recording area 28, but the reflective film area is provided in a part of the plurality of recording areas 28A. Instead, it is a transmission type. In other words, the configuration is a combination of the reflection type and the transmission type. FIG.
8, only one row of the recording area 28 is shown.
Can be configured as a plurality of columns. Also,
As shown in FIG. 9, a reflection film region having a predetermined pattern can be provided in a region where the recording area 28 is not provided.

FIGS. 19 and 20 are diagrams schematically showing a configuration for reading hologram data from the optical recording medium 26A of the third embodiment shown in FIG. FIG. 19 and FIG.
In the figure, the optical recording medium 26A is shown in a sectional view, but in the portion where the reflection film is provided, as in the first and second embodiments, the region 29 of the reflection film is protected by the recording layer of the substrate 27. It is provided between layers 31.

FIG. 19 shows a method for reading recorded data from a recording area 28 provided with a reflective film area 29. In FIG. To read data, a light beam from a laser diode 45 on the substrate 27 is irradiated onto the recording area 28 from the substrate 27 side of the prepaid card 26 via a lens 46 and a half mirror 47,
Light reflected from the recording area 28 and the area 29 of the reflective film behind the recording area 28 is received by the image sensor 48. FIG. 20 shows a method for reading recording data from a recording area 28A where the reflection film area 29 is not provided. FIG.
In this state, the prepaid card 26 is moved in the left-right direction in the figure to control the recording area 28A to come to the reading position. To read data, the recording layer 28A is irradiated from the protection layer 31 side of the prepaid card 26 via the lens 51 with a light beam from the laser diode 50 on the protection layer 31 side, and the transmitted light transmitted through the recording area 28A is captured by the image sensor. At 48, light is received.

The third embodiment has the following features as compared with the first and second embodiments, because the recording areas of the reflection type and the transmission type are mixed. That is, the configuration of the reading device is slightly complicated because it has a reflective type and a transmissive type, but the resin of the protective layer 31 has the irregularities of the hologram directly because the transmissive type portion is not provided with the reflective film. Since it has entered the recording area 28A and the resin is intricately hardened in the fine striped pattern, the person who intends to forge removes the protective layer by any method and tries to copy the hologram pattern. It is difficult to remove the resin of the protective layer that has entered the fine irregularities, and it is more difficult to forge than the first and second embodiments. The step of the unevenness in the hologram is determined by the wavelength of the light to be used and the like. Therefore, the step in the transmissive recording area 28A can be changed from that of the reflective recording area. On the other hand, if this allowance is not made, and if the transmissive type has the same level difference as the reflective type, the transmissive type has a low efficiency of diffracted light. This can be dealt with by improving the sensitivity of the part.

In each of the above embodiments, at least two or more reflective film regions 29 are provided, and they are not continuous and independent, so that the reflective film can be easily dissolved even when immersed in a caustic soda solution. However, even if there is a single reflective film, if the end is not exposed to the outside on the side surface or other places of the optical recording medium, it can be easily reflected even if immersed in a caustic soda solution. The film does not melt.
Therefore, as a simple configuration for preventing forgery of an optical recording medium,
Protective layer 31 so that reflective film 29 is not exposed to the outside.
And the substrate 27 can be configured to be in close contact with the entire circumference of the optical recording medium.

[0036]

As described above, according to the present invention, an optical recording medium is manufactured by recording character or image information as a pattern of interference fringes of a hologram by an electron beam. It is possible to draw extremely delicate and precise patterns as compared with drawing by a laser beam used for a laser beam, and it is extremely costly to duplicate and manufacture a counterfeit product. It is difficult to manufacture, and the reflective film has a plurality of areas facing each or a plurality of recording areas, and is arranged so as to cover the entire two-dimensional image area of each recording area, and each of the reflective films The region is not continuous with the region of the adjacent reflective film and is independent, or the protective layer and the substrate are adhered over the entire circumference of the optical recording medium so that the reflective film is not exposed to the outside. Since the structure, by dissolving the reflective film it is difficult to achieve forged exposes the uneven surface of the hologram.

According to one embodiment of the present invention, the reflection film is further provided in an area where no recording area is provided,
Visually, predetermined information and a fine predetermined pattern are shown, which makes it difficult to forge or illegally use. Further, according to another aspect of the present invention, since the optical recording medium has a protective layer and the reflective film is provided between the recording layer and the protective layer of the substrate, the optical recording medium may not be used repeatedly by using a dummy sheet. It can be effectively prevented. Further, according to another aspect of the present invention, forgery is prevented because the resin of the protective layer enters the concave and convex portions of the hologram by forming a transmissive recording area without providing a reflective film area for a part of the recording area. It is even more difficult.

Further, according to the present invention, since characters and images can be recorded in a small area, an extremely large amount of information can be recorded when recording information on a card-shaped optical recording medium of about business card size. . In addition, by comparing the reproduced signal with a predetermined signal based on the combination of characters to be recorded and the specificity of a specific image, a legitimate card and a counterfeit product can be easily identified.

[Brief description of the drawings]

FIG. 1 is a plan view of a first embodiment of an optical recording medium according to the present invention as viewed from a substrate side.

FIG. 2 is a cross-sectional view of the optical recording medium of FIG. 1 taken along the line II-II.

FIG. 3 is a block diagram schematically showing an example of a process for manufacturing an optical recording medium according to the present invention.

FIG. 4 is a diagram showing a procedure for obtaining an interference fringe pattern of a hologram from a two-dimensional image.

FIG. 5 is a cross-sectional view illustrating an example of a manufacturing process of the optical recording medium according to the present invention.

FIG. 6 is a cross-sectional view showing another example of the manufacturing process of the optical recording medium according to the present invention.

FIG. 7 is a cross-sectional view showing another example of the manufacturing process of the optical recording medium according to the present invention.

FIG. 8 is a diagram showing another configuration of the recording area of the optical recording medium according to the present invention.

FIG. 9 is a plan view of a second embodiment of the optical recording medium according to the present invention, as viewed from the substrate side.

FIG. 10 is a diagram showing a configuration for reading recorded data from an optical recording medium according to the first and second embodiments of the present invention.

FIG. 11 is a diagram showing a normal transmission type reproducing system for reading data from a transmission type optical recording medium.

FIG. 12 is a diagram showing a normal transmission type reproducing system for reading data from a transmission type optical recording medium in which a thin dummy sheet is stuck on a protective layer by an unauthorized user.

FIG. 13 is a schematic diagram showing thermal destruction by a thermal head.

FIG. 14 is a schematic view showing destruction by a laser beam.

FIG. 15 is a schematic diagram showing destruction by mechanical deformation by a dot impact head.

FIG. 16 is a schematic view showing penetration or puncture breaking by a drill bit.

FIG. 17 is a schematic view showing punching destruction for pressing a punch into a die.

FIG. 18 is a plan view of a third embodiment of the optical recording medium according to the present invention as viewed from the substrate side.

FIG. 19 is a schematic diagram showing a configuration for reading data from a reflective recording area in a third embodiment.

FIG. 20 is a schematic diagram showing a configuration for reading data from a transmission recording area in a third embodiment.

[Explanation of symbols]

10 Image Signaling Circuit 12 Switch 14 Numerical Operation Device 16 Encoder 18 Electron Beam Exposure Device 20 Primary Recording Medium 22 Stepper 24 Optical Recording Medium (Optical Disk) Manufacturing Process 26, 26A Optical Recording Medium 27 Substrate 28, 28A, 44a, 44b, 44c, 44d Recording area 29, 29A, 29B, 29C, 29D, 29E Area of reflective film 30 Substrate 31 Protective layer 32 Photoresist (medium to be exposed) 34 Electron beam 36 Metal plating layer 36A Stamper 38 Press member 40 PC resin 40A Light Recording medium body 42 Press base 45, 50 Laser diode 46, 51 Lens 47 Half mirror 48 Image sensor IN1, IN2 Input terminal

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Kanji Kanuma 3-12-12 Moriyacho, Kanagawa-ku, Yokohama, Kanagawa Prefecture Inside (72) Inventor Kazunori Namiki 3-12 Moriyacho, Kanagawa-ku, Yokohama, Kanagawa Address Victor Company of Japan, Ltd. (72) Inventor Kenji Narusawa 3-12 Moriyacho, Kanagawa-ku, Yokohama-shi, Kanagawa Japan Victor Company of Japan, Ltd.

Claims (13)

[Claims] 1. An optical recording medium having a substrate and a plurality of recording areas and a reflective film on a recording layer formed on the substrate, wherein each of the recording areas has an interference of a hologram corresponding to a two-dimensional image to be recorded. A copy obtained by drawing stripes with an electron beam, wherein the reflective film has a plurality of areas facing each or a plurality of the recording areas, and a two-dimensional image area of each of the recording areas An optical recording medium, wherein the optical recording medium is arranged so as to cover the entirety of the optical recording medium, and each area of the reflective film is independent of an adjacent area of the reflective film. 2. In an optical recording medium having a substrate and a plurality of recording areas and a reflective film on a recording layer formed on the substrate, each of the recording areas is obtained by reading a two-dimensional image to be recorded and digitizing the two-dimensional image to be recorded. The obtained data is subjected to arithmetic processing, and data representing interference fringes of the hologram is given to the electron beam exposure apparatus,
The medium to be exposed is exposed by scanning with an electron beam and drawn, and the medium to be exposed is etched and plated to be duplicated and formed. The reflection film faces each or a plurality of the recording areas. A plurality of areas, and are arranged so as to cover the entire two-dimensional image area of the individual recording area, and that each area of the reflective film is independent of an adjacent area of the reflective film and is independent. An optical recording medium characterized by the following. 3. An optical recording medium having a substrate and a plurality of recording areas and a reflective film on a recording layer formed on the substrate, wherein each of the recording areas has an interference of a hologram corresponding to a two-dimensional image to be recorded. A copy obtained by drawing stripes with an electron beam, wherein the reflection film has a plurality of regions facing each or a plurality of the recording areas, and 2 of the individual recording areas.
An optical recording medium which is arranged so as to cover an entire three-dimensional image area, and wherein each area of the reflective film is independent of an adjacent area of the reflective film and is independent. 4. In an optical recording medium having a substrate and a plurality of recording areas and a reflective film on a recording layer formed on the substrate, each of the recording areas is obtained by reading a two-dimensional image to be recorded and digitizing it. The obtained data is subjected to arithmetic processing, and data representing interference fringes of the hologram is given to the electron beam exposure apparatus,
It is formed by exposing the medium to be exposed by scanning with an electron beam, drawing the medium, etching and plating the medium to be exposed, and duplicating the reflection film. A plurality of areas facing each other, and two of the individual recording areas
An optical recording medium which is arranged so as to cover an entire three-dimensional image area, and wherein each area of the reflective film is independent of an adjacent area of the reflective film and is independent. 5. An optical recording medium having a substrate and a plurality of recording areas, a reflective film, and a protective layer on a recording layer formed on the substrate, wherein each of the recording areas corresponds to a two-dimensional image to be recorded. It is a copy of a hologram obtained by drawing interference fringes with an electron beam, wherein the reflection film has a region facing a plurality of the recording areas, and the reflection film is exposed to the outside. An optical recording medium, wherein the optical recording medium is located between the protective layer and the substrate so that the optical recording medium is not in contact with the protective layer. 6. The apparatus according to claim 1, wherein the reflection film is further provided in an area where the recording area is not provided, and predetermined information is visually shown. The optical recording medium according to any one of the above. 7. The method according to claim 1, wherein the reflection film is further provided in an area where the recording area is not provided, and is configured to show a fine predetermined pattern visually. The optical recording medium according to any one of the above. 8. The method according to claim 1, further comprising a protective layer, wherein the reflective film is provided between the recording layer and the protective layer on the substrate. The optical recording medium according to any one of the above. 9. The light according to claim 1, wherein a part of the plurality of recording areas does not have a region of the reflection film and is a transmission type recording area. recoding media. 10. The optical recording medium according to claim 1, wherein information indicating that the optical recording medium is genuine is recorded in the recording area. 11. The optical recording medium according to claim 1, wherein information for specifying an owner or an issuer of the optical recording medium is recorded in the recording area. 12. The light according to claim 1, wherein independent information is recorded in each of the recording areas, and the recording areas are arranged in a plurality of columns. recoding media. 13. The same information is recorded in a plurality of adjacently arranged recording areas, and the units are arranged in a plurality of columns, with the plurality of adjacently arranged recording areas as one unit. The optical recording medium according to any one of claims 1 to 11, wherein