JP2000268147A - Optical recording medium and optical recording medium reproducing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily confirm a ticket, to improve security and to easily manage an entering person. SOLUTION: This optical recording medium for which a computer generated hologram(CGH) 4 is formed at a prescribed position is used as a ticket medium 1, the CGH 4 is irradiated with light from a monochromatic light emission part 21, a reproducing video image by diffracted light is projected to a photodetector 22 and the authenticity of the ticket medium is judged by recognizing it. Also, by cutting off and recovering a stub, an entering person is managed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to a CGH (Comp
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical recording medium on which information is recorded by a hologram called an "Upper Generated Hologram" and a reproducing apparatus thereof, and particularly to an optical recording medium effective for authentication of a recording medium, prevention of forgery and falsification, and a reproducing apparatus thereof.

[0002]

2. Description of the Related Art Conventionally, entry to an amusement park, a concert hall, an event hall, or the like is usually permitted by presenting or passing a ticket issued by an organizer. These admission tickets are made of paper or the like, and are visually checked on the paper surface, and in some cases, admission is permitted by cutting a stub. However, since a large number of people enter in a short period of time, it is difficult to check the contents of the ticket record and check it all completely, and even if a sophisticatedly forged ticket is used, it will be immediately Is not known.

Further, Japanese Patent Application Laid-Open No. Hei 10-153702 discloses a means for preventing copying by making copying difficult by providing a hologram or the like in which the angle of a diffraction grating is changed on a gold note or securities. However, due to recent improvements in color copy technology and the like, some copying is possible. The hologram disclosed in Japanese Patent Application Laid-Open No. H10-153702 is a single hologram pattern due to interference of white light, and can record a simple image such as a manufacturer mark only in a visible state. First, complicated information such as ticket contents can be obtained only by visually observing information such as characters and marks normally printed in another area.

[0004]

A paper ticket as described in the section of the prior art can be easily copied or forged, and for example, a single hologram pattern due to the interference of white light. Even if the hologram is attached, since the hologram has a large area, the hologram can be easily identified only by looking at the attachment position and the recorded information (video). This provides a clue to forgery and the like, and a hologram having a single hologram pattern due to the interference of white light makes it possible to relatively easily produce a simulated image. Was impossible to prevent.

[0005] Therefore, the present invention provides an optical recording medium which can easily determine whether or not the ticket is an illegal ticket, and which is extremely difficult to forge and facilitates entrance control to a venue, and a recording medium on this optical recording medium. It is an object of the present invention to provide an optical recording medium reproducing apparatus capable of reproducing recorded information.

[0006]

In order to achieve the above object, the present invention provides a hologram pattern provided to project a predetermined pattern by diffracted light at a plurality of predetermined positions on an optical recording medium. In addition, the authenticity can be determined by recognizing a predetermined reproduced video pattern indicated by diffracted light generated when monochromatic coherent light is irradiated by the light receiving element and performing image processing. by this,
Authentication of the authenticity of the ticket and management of visitors can be performed mechanically in a short time.

The present invention is intended to provide an optical recording medium and an optical recording medium reproducing apparatus described below as means for achieving the above object.

[0008] 1. A first hologram pattern having a hologram pattern for outputting diffracted light indicating a predetermined image when irradiated with monochromatic light;
An optical recording medium comprising: a first information recording unit; and a second information recording unit, wherein the first information recording unit and the second information recording unit can be divided.

[0009] 2. The hologram pattern, the image information represented by the diffracted light output from the hologram pattern, the copyright holder of the optical recording medium, issue number, manufacturer,
The optical recording medium according to claim 1, wherein the optical recording medium is configured to be information indicating at least one of ticket information and information on the optical recording medium itself.

[0010] 3. The first and second information recording sections have a plurality of hologram patterns in which some hologram patterns are destroyed with a predetermined regularity, and the first information recording section or the second information recording section has a plurality of hologram patterns. 3. The optical recording medium according to claim 1, wherein the information indicated by the diffracted light when the portion is irradiated with monochromatic light is information capable of specifying the optical recording medium.

4. An optical recording medium reproducing apparatus for reproducing information from an optical recording medium including a plurality of information recording sections each having a hologram pattern, wherein monochromatic light irradiation means irradiates the information recording section of the optical recording medium with monochromatic light. Recognizing means for receiving the diffracted light output from the information recording unit and recognizing image information indicated by the diffracted light, dividing means for dividing the optical recording medium among the plurality of information recording units,
Among the optical recording media divided by the dividing means,
An optical recording medium reproducing device, comprising: a discharging unit that discharges at least one of the two.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Some preferred embodiments of the present invention will be described below with reference to the drawings.
FIG. 1 is a plan view showing an embodiment of the optical recording medium of the present invention. The optical recording media 1 and (10) shown in FIG. 1 are card-shaped media, and can be divided into a main card 1a on the left and a sub card 1b on the right with the cut line 5 as a boundary. Each of the main card 1a and the sub card 1b has a plurality of holograms (CG
H) The information recording units 2 and 3 composed of 4 are formed, and the same information is recorded in the first information recording unit 2 and the second information recording unit 3.

The principle of reproducing the information recorded on the optical recording medium 1 will be described with reference to FIGS. FIG. 2A is a perspective view showing an embodiment of the transmission type optical recording medium 1, and FIG. 2B is a view showing A- of the transmission type optical recording medium 1 shown in FIG. It is A sectional drawing. Then, as shown in FIG. 2B, the transmission type optical recording medium 1
A hologram 4 is formed on a member 6 serving as a substrate, and a hologram 4 is coated thereon with a transparent protective film 7 made of a material having a different refractive index. Further, the opposite surface of the member 6 may be coated with a transparent protective film 8. Then, as shown in FIG. 2A, when the information recording units 2 and 3 on the optical recording medium 1 are irradiated with the monochromatic light output from the monochromatic light emitting unit (monochromatic light irradiation means) 21, the hologram 4 transmits the monochromatic light. Hologram reproduction pattern (image) behind optical recording medium 1 by diffracted diffracted light
11 can be obtained.

Similarly, FIG. 3A is a perspective view of an embodiment of the reflection type optical recording medium 10, and FIG. 3B is a sectional view taken along the line BB of FIG. As shown in FIG. 3B, in the reflection type optical recording medium 10, a hologram 4 is formed on a member 6 serving as a substrate, and a reflection film 9 (for example, aluminum) is sputtered thereon. Then, a protective film 7 made of a material such as a UV curable resin is coated thereon. Further, the opposite surface of the member 6 may be coated with a transparent protective film 8. Then, as shown in FIG.
When the monochromatic light emitting unit (monochromatic light irradiating means) 21 irradiates the monochromatic light emitting unit (monochromatic light irradiating means) 21 to the information recording units 2 and 3 on 0, the diffracted light reflected and diffracted by the action of the hologram 4 and the reflecting film 9 causes
The hologram reproduction pattern (image) 11 can be obtained on the side of the optical recording medium 1 where the monochromatic light emitting section 21 is located.

FIG. 5 shows an optical recording medium (card) 1 in which transmission type CGHs 4a and 4b are molded. CGH
Reference numeral 4a denotes a CGH having a structure similar to that of the above-described CGH 4, and has a step of binary unevenness as shown in FIG. The CGH 4b is a CGH having a quaternary or four-level unevenness as shown in FIG. 4B, and records a complicated pattern such as a card company logo, a mark, a user's fingerprint, and a portrait. . When the CGHs 4a and 4b are irradiated with the monochromatic light output from the monochromatic light emitting section 21, the respective reproduced video patterns can be obtained by the transmitted diffracted light. CG
Even when H4b is used, the reflection type optical recording medium 10 can be obtained by forming a reflective film. In this case, the monochromatic light emitting section 21 is formed by reflected diffracted light obtained by irradiating monochromatic light. The playback video pattern can be obtained on the side.

Here, the hologram pattern is an embodiment of a diffraction grating, and a one-dimensional diffracted light is generated if the diffraction grating is parallel. According to the present invention, it is possible to arrange bright points two-dimensionally by combining not one parallel diffraction grating but another diffraction grating rotated in a plane including the diffraction grating. Then, a calculation is performed using a computer so that the diffracted light is arranged two-dimensionally.
The hologram that is the pattern to be diffracted, that is,
CGH (Computer Generated Ho
loggram). As such a hologram (CGH), for example, a monthly magazine “Oplus E”
(Published by New Technology Communications Inc .; No.
204; November 1996) can be applied.

Referring briefly to the sectional view of the CGH 4a shown in FIG. 4A and the sectional view of the CGH 4b shown in FIG. 4B, the material of the CGHs 4a and 4b is a transparent light-transmitting resin. In addition, a stair-like step corresponding to the phase difference is provided in order to cause a phase difference in the incident light and cause a light diffraction phenomenon. In the case of the simplest phase-type CGH, the binary CGH 4a shown in FIG. 4A divides one cycle (2π) of the wavelength of incident light into two, so that the phase difference for one value is π, There are two steps including 0π. In the case of the four-valued CGH 4b shown in FIG. 4B, one cycle is divided into four, the phase difference for one value is set to 1 / 2π, and the steps include 0π (the part where the phase is not changed). It becomes four steps. Furthermore, even in the case of four or more values, a multi-level CGH can be manufactured by equally dividing one cycle (2π) of the wavelength and assigning it to each stage. The diffraction efficiency increases as the number of values increases, but the manufacturing process becomes complicated.

The video pattern 11a reproduced by the binary CGH 4a having such a structure projects a pattern symmetrical to zero-order light (DC light). One of them is shown as the reproduction pattern 11a of the CGH 4a in FIG. 5, and the pattern of "A" is displayed as a light point as an example. Also 4
The video pattern 11b reproduced by the CGH 4b of the value is a reproduced pattern 11b of the CGH 4b by transmitted diffraction light generated by irradiating the coherent light (laser light) output from the monochromatic light emitting unit 21 to the quaternary CGH 4b.
Will be displayed as This video pattern 11b is formed as a pattern that is not point-symmetric with respect to the zero-order light. In the example of FIG. 5, the pattern of the vehicle shadow is displayed as a bright point. These reproduction patterns 11a and 11b are sets of bright spots, and by using these reproduction patterns (optical information) 11a and 11b, authentication can be performed. In the design of a logo or the like that requires a high degree of freedom, it is desirable to use a quaternary CGH 4b that can display a complicated image. However, as described above, the production of a large multi-valued CGH is an IC process. Has the disadvantage that it is complicated. Therefore, what kind of CGH is used depends on the type of image to be displayed, the cost, and the like, and an optimum one is selected.

A specific method of manufacturing an optical recording medium provided with such a CGH is disclosed in Japanese Patent Application Laid-Open No. H10-143929, entitled "Method of Manufacturing Master Optical Recording Medium, Information recording method and optical recording medium manufacturing apparatus and manufacturing method ", so here,
The details are omitted. In the following embodiments,
Optimal optical recording media for use in ticket cards, etc.
An optical recording medium reproducing apparatus that is most suitable for reproducing the optical recording medium will be described.

FIGS. 6 and 7 show information unique to each card 1 (information which can identify each card when the optical recording medium (card) 1 shown in FIG. 1 is issued). FIG. 7 is a diagram for describing an example of a method of recording ()) in a column of CGH4. Here, the meaning of recording information in the column of CGH4 differs depending on the position of the destroyed CGH4 (or the position of undestructed CGH4) by destroying a predetermined number of CGH4 included in the column of CGH4. It means giving meaning. This destruction of CGH4 is achieved by irradiating a laser as shown in FIG.
May be melt-ruptured, or the CGH 4 may be physically crushed by an impact type (not shown).

The specific position of the CGH 4 to be destroyed is determined by the combination. Combination fracture, for example, out of 10 CGH4, when making sure to destroy five to is, as shown in FIG. 7, ₁₀ C ₅
= 252 meanings. And in this case, CGH4 destroyed in any combination
And the number of non-destructive CGH4 are always 5, so if another CGH4 is destroyed in an attempt to rewrite this combination for forgery, the non-destructive CGH4
Becomes less than 5, and the data indicated by CGH4 becomes meaningless. As described above, since the CGH 4 is an irreversible memory and it is impossible to reproduce the destroyed CGH 4, it is not possible to rewrite the information once the information is recorded on the CGH. The same CGH4
If you want to reproduce the information of
The method is complicated, because it is necessary to take a replica of the GH4 and analyze the contents. Therefore, this CGH
Recording information in column 4 is an extremely effective means against forgery and the like.

For example, in the case of a row in which 30 CGH4 are arranged (a plurality of rows may be provided as shown in FIG. 6), ₃₀ C ₁₅ = about 150 million ways can be expressed.
It becomes possible to issue the card 1 having information different for the population of Japan. Furthermore, when 50 CGH4s are arranged, ₅₀ C ₂₅ = approximately 126 trillion expressions are possible, and it is sufficiently possible to assign a unique number to cards 1 of a population equal to or greater than the population of the entire world. Become. Recording data on the CGH 4 of the card 1 using such a laser is performed when the card 1 is issued (at the time of manufacture). Therefore, if the recording device itself is installed in a factory or a card issuing place, good. Therefore, an apparatus installed at an amusement facility or an entrance gate of a concert hall for actually authenticating the card 1 may be an optical recording medium reproducing apparatus which only reads CGH4 and has no recording means.

FIG. 8 is a schematic block diagram of one embodiment of the optical recording medium reproducing apparatus according to the present invention, and its operation flowchart is shown in FIG. The optical recording medium reproducing device 20 shown in FIG.
A monochromatic light emitting section 21 for dividing and outputting monochromatic light such as a laser beam toward each CGH 4 and a light receiving element 22 such as a CCD or a MOS for receiving a reproduced pattern by diffracted light from the CGH 4a.
A medium information display unit 23 for displaying information or an authentication result obtained by analyzing the reproduction pattern received by the light receiving element 22, and an image display unit 24 for displaying a reproduction pattern by diffracted light from the CGH 4b. Further, although not shown, the optical recording medium 1 is
0, a transfer mechanism (ejecting means) for taking in and ejecting data into and from the host 30, a communication means for transmitting and receiving data to and from the host 30, and a range that can be understood without inquiring the host 30 (for example, the number or main Card 1a and secondary card 1b
And the like, and authentication means for performing authentication based on collation of information recorded in the information and the dividing means 25 as shown in FIG. The optical recording medium 1 to be reproduced is CGH4b
Is not provided, the monochromatic light emitting section 21 for irradiating the CGH 4b with monochromatic light and the image display section 24 can be omitted. When the authentication is performed only by the authentication unit in the playback device 20 and the communication with the host 30 is not required, the communication unit is unnecessary.

Then, the medium information display section 23 stores information recorded on the CGH 4a of the first information recording section 2 of the main card 1a and CGH of the second information recording section 3 of the sub card 1b.
A display unit made of a liquid crystal or the like for displaying data obtained from an image obtained by reproducing information recorded in 4a, or an authentication result by an authentication unit (or an inquiry result to the host 30). Then, the image pattern obtained by the light receiving element 22 is recognized, an electric signal indicating the content (or a part thereof) is generated in accordance with the recognition result, and the content (or one of the contents) is generated in response to the electric signal. Part) can be displayed.
As an example of the display content, the entry expiration date, serial number, event content, and the like recorded on the card 1 can be displayed. Also, a CG recording image information on the card 1
When H4b is also formed, the information reproduced by the diffracted light from the CGH 4b is displayed on the image display unit 24 that displays the information as it is. Then, the image display unit 24
For example, a screen on which an image reproduced by diffracted light output from the CGH 4b is projected and displayed, or an image reproduced from the CGH 4b is recognized by a CCD or the like, and the information is converted into an electric signal. Display means for displaying an image by the electric signal is used.

The operation of the optical recording medium reproducing apparatus 20 will be described with reference to the flowchart shown in FIG. First, when the card 1 is inserted from the insertion slot, the card 1 is conveyed to the inside of the reproducing device 20 by a driving device (not shown) (step 31). While performing this conveyance, the monochromatic light output from the monochromatic light emitting section 21 is divided into a plurality of CGH 4a rows recorded in the information recording sections 2 and 3 simultaneously in the order of the sub card 1b and the main card 1a (this example). Then 3
The light is divided and irradiated, and the diffracted light output from the CGH 4a is received by the light receiving element 22, thereby detecting the reproduced video pattern and sequentially reading the recorded information (step 32). When the card 1 is inserted to a predetermined position, the conveyance is stopped. When the card 1 is provided with the CGH 4b, the CGH 4b is irradiated with monochromatic light at the stopped position to reproduce the image, and the CGH 4b is displayed on the image display unit 24.
Information is displayed. Here, the authenticity of the card can be easily determined visually (step 33).

Next, the information recorded in the information recording sections 2 and 3 of the main card 1a and the sub card 1b are collated by the authentication means (step 34), and if they match, a part of the data or the authentication result is determined. Then, in a necessary use mode, the collation is performed by communication with the host center 30 (step 35 → Y → 36), and if it is determined that the card 1 is an authentic card 1, entry is permitted (step 37). However, for example, if the used secondary card has been altered, such as pasting it again, the information recorded in the information recording units 2 and 3 does not match by collation by the authentication means (step 35 → N →
40) In this case, or when it is determined that the collation result by the communication with the host center 30 is not the authentic card 1,
The use of the card as NG is stopped, a predetermined unauthorized card process is performed (step 40), the card is collected (step 41), and the card 1 is also sent to the host center 30.
Send the information.

When the card 1 is an authentic ticket, the use as a ticket is terminated at the same time as the admission is permitted. Therefore, after the admission is permitted, the sub card 1b and the main card 1a are cut along the cutting line 5. And deputy card 1b
Is collected in the playback device 20 (step 38), and only the main card 1a is returned to the user of the card 1 (step 3).
9).

Here, the main card 1 in step 38
A and the secondary card 1b are cut by the cutting line 5 using cutting means 25 having a structure as shown in FIG. That is,
After deciding that the ticket card 1 is genuine and permitting entry, the main card 1a is held by applying a predetermined pressure by the main card holding means 26 so that the main card 1a is not subjected to a shock at the time of cutting. Keep it fixed. Subsequently, cutting means 2
5 is applied to the cut line 5 formed between the two cards 1a and 1b to cut off the sub card 1b. After being cut off, the main card holding means 26 is released from the separation, and the main card 1a is discharged by a discharge means (not shown).

At this time, the primary card 1a and the secondary card 1b
CGHs 4a and 4b recorded in the information recording units 2 and 3
May be destroyed by an impact means or the like (not shown) so as not to be reused, and then discharged and collected.

The optical recording medium reproducing device 20 described above is
A reproducing apparatus 20 for reproducing information recorded on a ticket card 1 provided with a transmission type CGH,
Even in a reproducing apparatus for reproducing information recorded on the ticket card 10 provided with the GH, for example, as shown in FIG. 11, the monochromatic light emitting section 21 and the light receiving element 22 (the image display section 24)
Is provided on the same side, and the other configuration can be similarly configured.

As described above, in the optical recording medium and the recording / reproducing apparatus of the present invention, the irreversible CGH, which cannot be rewritten, is formed at a predetermined position, which is an effective countermeasure against forgery and falsification. In order to manufacture such an illegal ticket, a CGH configured to project a predetermined mark or the like must be manufactured using a considerably large-scale drawing apparatus and a molding apparatus. Since a considerable capital investment is required, the financial merits of fraud are eliminated, and the ticket is virtually impossible to forge.

Then, the optical recording medium 1 and the reproducing device 20
Although the case where two types of CGHs 4a and 4b are provided is described, even when only one of the CGHs is provided,
Clearly, security is much higher than traditional paper tickets.

The ticket card can be used even after use.
Since the information recorded in the GH remains, the value as a card-type souvenir can be included. Furthermore, this CG
H-added cards are not used as tickets, but as magnetic stripes or large-capacity recording media with ICs.
It may be used for other purposes.

[0034]

According to the optical recording medium of the present invention, a hologram pattern recorded so as to project a predetermined pattern by diffracted light is formed at a plurality of dividable locations. In addition, the authentication of the optical recording medium can be easily performed.

Further, the optical recording medium reproducing apparatus of the present invention can perform authentication of whether a ticket is genuine and management of visitors mechanically in a short time, and perform efficient and reliable entrance processing. Can be. Furthermore, since the optical recording medium is divided and at least one is ejected after authentication, the ejected medium can be stored as a commemorative card.

[Brief description of the drawings]

FIG. 1 is a plan view showing an embodiment of an optical recording medium of the present invention.

FIG. 2 is a perspective view and a cross-sectional view showing one embodiment of a transmission type optical recording medium of the present invention.

FIG. 3 is a perspective view and a cross-sectional view showing one embodiment of the reflective optical recording medium of the present invention.

FIG. 4 is a diagram for explaining a concave-convex section of the CGH of the optical recording medium.

FIG. 5 is a perspective view showing another embodiment of the transmission type optical recording medium of the present invention.

FIG. 6 is a diagram for explaining a method of recording CGH data on an optical recording medium.

FIG. 7 is a diagram for explaining an example of recording data of a CGH column.

FIG. 8 is a schematic configuration diagram showing one embodiment of an optical recording medium reproducing apparatus of the present invention.

FIG. 9 is a flowchart for explaining the operation of an embodiment of the optical recording medium reproducing apparatus of the present invention.

FIG. 10 is a schematic diagram for explaining a dividing unit of the optical recording medium reproducing device.

FIG. 11 is a schematic diagram for explaining a configuration example of an optical recording medium reproducing apparatus for reproducing a reflective optical recording medium.

[Explanation of symbols]

 Reference Signs List 1,10 Optical recording medium (card) 1a Main card 1b Secondary card 2,3 Information recording section 4,4a, 4b Hologram (CGH) 5 Cut line 20 Optical recording medium reproducing device 21 Monochromatic light emitting section (monochromatic light irradiation means) Reference Signs List 22 light receiving element 23 medium information display section 24 image display section 25 dividing means

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 3E027 BA02 BA09 5B035 AA15 BA06 BB05 BB11 BC00 5B058 CA33 KA06 KA32 YA20 5B072 BB00 CC35 DD02 DD03 GG02 GG07

Claims (4)

[Claims] A first hologram pattern having a hologram pattern for outputting a diffracted light indicating a predetermined image when irradiated with monochromatic light, wherein the first information recording unit and the second information recording unit have a hologram pattern; An optical recording medium characterized in that it can be divided into an information recording unit. 2. The hologram pattern according to claim 1, wherein the image information represented by the diffracted light output from the hologram pattern is composed of a copyright owner, an issue number, a manufacturer, ticket information of the optical recording medium, and information relating to the optical recording medium itself. 2. The optical recording medium according to claim 1, wherein the optical recording medium is configured to be information indicating at least one of the information. 3. The first and second information recording sections have a plurality of hologram patterns in which some hologram patterns are destroyed with a predetermined regularity. 3. The optical recording medium according to claim 1, wherein the information indicated by the diffracted light when the monochromatic light is applied to the second information recording unit is information that can specify the optical recording medium. 4. An optical recording medium reproducing apparatus for reproducing information from an optical recording medium having a plurality of information recording sections each having a hologram pattern, wherein the information recording section of the optical recording medium is irradiated with monochromatic light. A monochromatic light irradiating unit, a recognizing unit that receives diffracted light output from the information recording unit and recognizes image information indicated by the diffracted light, and divides the optical recording medium among the plurality of information recording units. Dividing means, and among the optical recording media divided by the dividing means,
An optical recording medium reproducing device, comprising: a discharging unit that discharges at least one of the two.