JP4243914B2 - Image recording medium and information reading method - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an image recording medium and an information reading method suitable for application to a card or a passport for storing information such as personal information that requires safety such as forgery and alteration prevention.
[0002]
[Prior art]
In recent years, for example, in the service industry field such as banks, companies, schools, and public offices, there are many cases of issuing contact-type or non-contact-type electronic or magnetic cards. Information such as cash cards, employee ID cards, employee ID cards, membership ID cards, student ID cards, alien registration cards, and various licenses used in these fields, as well as information on passports, is more easily forged or altered. Security processing is applied.
[0003]
For example, a hologram layer is provided on a card substrate, and a special image is formed so that a face photograph, a name, an issue date, and the like are not easily imitated. In this image, a diffraction grating image or an optical change image generally called a hologram image is formed. This hologram image is formed by interference fringes obtained by superimposing a wave reflected from or transmitted through an object and a reference wave. Is. Some hologram images reproduce an object image three-dimensionally. The hologram layer is covered with a sheet-like protective sheet having good light transmittance, and a transparent resin such as a laminate is used for the protective sheet, and the hologram layer is protected so as to cover the hologram layer that is weaker than the card substrate.
[0004]
[Problems to be solved by the invention]
In this way, information and a hologram layer are provided on the card substrate, but the hologram image overlaps with the information when the information is read using reflected light by an optical reader, for example, when shopping, traffic, entrance, etc. are permitted. There is a risk of reading errors in information.
[0005]
SUMMARY OF THE INVENTION The present invention solves the above-described problems, and an object thereof is to provide an image recording body and an information reading method in which an optical change image does not overlap information and information reading accuracy is improved. .
[0006]
[Means for Solving the Problems]
In order to solve the above problems and achieve the object, the present invention is configured as follows.
[0007]
The invention described in claim 1
“The image recording medium has the following configuration:
Base material;
An image receiving layer provided on the substrate; and an optical change element layer provided on the substrate.
The optical change element layer has an optical change image at least in part,
The optical change image is formed on the information received on the image receiving layer,
In directions other than the reading of information, the optical change image will appear to overlap with the image of the information recorded on the image-receiving layer, and, in the direction of reading of the information, the optical change image, recorded in the image-receiving layer An image recording body characterized in that it is provided so that only the information image recorded in the image receiving layer appears without overlapping with the information image formed. ].
[0009]
The invention described in claim 2
[In the image recording medium of claim 1,
In the optical change element layer, a first optical change image and a second optical change image are formed,
Image recording member, characterized in that seen Awards angle of the second optical change image and ornamental angle of the first optical change image differs. ].
[0010]
The invention according to claim 3
3. The image recording body according to claim 2 , wherein the second optical change image is formed on at least a part of characters received on the image receiving layer. ].
[0011]
The invention according to claim 4
“In the image recording body according to claim 1, an optical change image is formed on at least a part of characters received on the image receiving layer, and the literature and the optical change image are overlapped to form the optical recording medium. When the reflectance at the point where the character is formed under the change image is Mx and the reflectance at the point where the character is not formed under the optical change image is Mo, the following equation is satisfied. An image recording medium characterized by the above.
[0012]
0.3 ≦ (Mo−Mx) / Mx ”.
[0013]
The invention described in claim 5
In the method for reading the information of the image recording body having a base material, an image receiving layer in which information is recorded on the base material, and an optical change element layer provided on the base material,
With the following steps:
Irradiating the image recording body with light, and reading reflected light from the direction of reading the information ;
The optical change element layer has an optical change image at least in part,
The optical change image is formed on the information received on the image receiving layer,
The optical change image is
In directions other than reading information, it appears overlapping the image of the information recorded on the image receiving layer,
The information reading direction is provided so that only the information image recorded on the image receiving layer appears without overlapping the information image recorded on the image receiving layer. Information reading method. ].
[0015]
The invention described in claim 6
In the method for reading the information of the image recording body having a base material, an image receiving layer in which information is recorded on the base material, and an optical change element layer provided on the base material,
With the following steps:
Irradiating the image recording body with light and reading reflected light;
An optical change image is formed on at least a part of the optical change element layer,
The optical change image is formed on the information received on the image receiving layer,
In the step of reading the reflected light, only the reflected light of the information image is read from an angle that does not overlap the viewing angle of the optical change image. ].
[0016]
As a preferred configuration of the present invention, an optical recording device in which an optical change element layer and an image receiving layer are laminated on a card base material and information is stored in the image receiving layer is optically read by an optical reader that reads information using reflected light. The optical change element layer is configured to be readable from a predetermined direction in which a change image does not appear overlapping the information. When reading the information on the image recording body using the reflected light by the optical reading device, the optical change image of the optical change element layer does not appear overlapping the information by reading from the predetermined direction, so the information reading accuracy is improved. .
[0017]
In addition, an optical recording element layer and an image receiving layer are laminated on a card substrate, and an image recording body having information on the image receiving layer constitutes an optical changing element layer so that information can be read using reflected light. The information on the image recording body is read by the reading unit of the optical reading device from a predetermined direction in which the optical change image does not appear overlapping the information. When reading the information on the image recording body using the reflected light by the optical reading device, the optical change image of the optical change element layer does not appear overlapping the information by reading from the predetermined direction, so the information reading accuracy is improved. . By reading the image recording body and the reading unit relatively moving in a predetermined direction, the optical change image of the optical change element layer does not appear overlapping the information, so that the information reading accuracy is improved.
[0018]
DETAILED DESCRIPTION OF THE INVENTION
DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of an image recording body and an information reading method according to the present invention will be described below with reference to the drawings. However, the present invention is not limited to the description of the embodiments and the drawings.
[0019]
FIG. 1 is a plan view showing an image recording body, and FIG. 2 is a diagram for explaining the layer structure of the image recording body. The image recording body 1 of this embodiment is a card of an employee ID card, and an optical change element layer 12 and an image receiving layer 13 are laminated on a card substrate 11 and a protective layer 14 is provided on the image receiving layer 13. The optical change element layer 12 includes a transparent thin film layer 12a and a hologram forming layer 12b having a marking on one surface, and an optical change image is formed.
[0020]
Moreover, it is preferable that the optical change image formed in the optical change element layer 12 has directivity. Hereinafter, all the optical change images in this specification will be described as having directivity. The optically changed image is preferably a hologram, a diffraction grating, or an uneven relief body, which is more effective for preventing falsification. Even more preferred are holograms and scale images.
[0021]
In this image recording body 1, information 20 such as characters, symbols, and photographic images is recorded on the image receiving layer 13. For example, photographic images are recorded by sublimation thermal transfer, and characters and symbols are recorded by fusion thermal transfer. After this thermal transfer recording, an image receiving layer 13 and an ionizing radiation cured layer are laminated and a protective layer 14 is provided for protection. The ionizing radiation curable layer is constituted by a UV curable resin layer by applying a UV liquid and irradiating and curing the UV light.
[0022]
The optical change element layer 12 is configured to be readable from a predetermined direction in which an optical change image does not appear on the information 20 by an optical reading device that reads the information 20 using reflected light.
[0023]
A writing layer 15 is provided on the side opposite to the optical change element layer side of the card substrate 11, and writing can be performed on the writing layer 15. The card base 11 is preferably used for a contact or non-contact type electronic or magnetic card by incorporating an IC module.
[0024]
As shown in FIGS. 3 and 4, the information 20 of the image recording body 1 is read by the optical reader 40 using reflected light. 3A is a perspective view of the optical reading device, and FIG. 3B is a configuration diagram of the reading unit. The image recording body 1 is moved with respect to the reading unit 41 of the optical reading device 40 to read the information 20. It is configured as follows.
[0025]
4A is a perspective view of the optical reading device, and FIG. 4B is a configuration diagram of the reading unit. The reading unit 51 of the optical reading device 50 is moved with respect to the image recording body 1 to read the information 20. It is configured as follows.
[0026]
FIG. 5 shows a state when the image recording body is read by an optical reader. When information 20 is read from the direction of FIG. 5A using reflected light, an optical change image of the optical change element layer 12 is displayed as information 20. However, when the information 20 is read from the direction of FIG. 5B using reflected light, the optical change image 60 of the optical change element layer 12 appears overlapping the information 20.
[0027]
The image recording body 1 includes an optical change element layer that can be read from a predetermined direction in which an optical change image does not appear on the information by the optical reading devices 40 and 50 that read the information 20 using reflected light. When the information 20 of the image recording body 1 is read using reflected light by the optical readers 40 and 50, the optical change image 60 of the optical change element layer 12 does not appear overlapping the information by reading from the predetermined direction. The reading accuracy of the information 20 is improved.
[0028]
As shown in FIG. 6, the information reading apparatus 70 is configured such that the mounting table 71 is rotatable, and the rotation of the mounting table 71 changes the reading direction of the image recording body 1 to move the reading unit 72 to perform information. Is configured to read.
[0029]
As shown in FIG. 7, the information reading device 80 is configured such that a mounting table 81 is rotatable, and the reading unit configured by a CCD camera changes the reading direction of the image recording body 1 by the rotation of the mounting table 81. 82 is moved to read information.
[0030]
As described above, the information reading apparatus has a reading unit that reads the information 20 of the image recording body 1 from a predetermined direction in which the optical change image does not appear on the information 20, and the information 20 of the image recording body 1 is read by the optical reading apparatus. When reading is performed using reflected light, the optical change image of the optical change element layer does not appear overlapping the information by reading from a predetermined direction, so that the information reading accuracy is improved.
[0031]
In the above-described embodiment, the example of the image recording body 1 in which the optical change element layer 12 is provided between the image receiving layer 13 and the card base material 11 has been described. It is sufficient that the image receiving layer 13 and the optical change element layer 12 are provided on the material 11.
[0032]
Further, as shown in FIG. 8, the image receiving layer 13 and the optical change element layer 12 are provided in this order on the card base material 11, particularly in terms of preventing forgery of the image recording body 1. preferable.
[0033]
Next, a second embodiment will be described.
[0034]
FIG. 9 is a view showing an image recording body having the same layer configuration as that of FIG. 8 and different from that of FIG. 8 only in the position where image information is recorded. FIG. 10 is a plan view of the image recording body of FIG. 9 as viewed from above.
[0035]
In FIG. 10, an image 101 and characters 102 are formed as information 20 on the image receiving layer 13 of the image recording body 1. Then, hologram (1) and hologram (2) are formed on the hologram forming layer 12b.
[0036]
A is the length of the character 101, B is the pitch of the hologram (2) in the length direction of the character, C is the width in the direction perpendicular to the length direction of the character 101, and D is the hologram 2 represents the width in which (2) is formed (direction perpendicular to the length direction of the character 101). Here, by making A larger than B, in at least a part of the character 101, the character 101 and the hologram (2) overlap, and the forgery prevention effect of the character 101 can be enhanced. Further, D is preferably larger than C from the viewpoint of preventing forgery.
[0037]
The viewing angle is different between the hologram (1) and the hologram (2). FIG. 12 shows viewing angles of the holograms {circle around (1)} and {circle around (2)} with respect to illumination light incident at θ ₁ . The hologram {circle around (1)} has an viewing angle near the angle θ ₂ , and the hologram {circle around (2)} has an angle of viewing that does not reach the angle θ ₂ . Here, the viewing angle refers to an angle at which the pattern of the optical change image is most easily observed.
[0038]
Next, as shown in FIG. 11, the illumination light of the optical reading device 40 of FIG. 3 is imaged at an angle θ _{1 on} the surface of the image recording body 1 having such holograms (1) and (2). Characters formed on the image recording body 1 are read by making the light incident on the recording body 1 and reading the light reflected from the image recording body 1 from the direction of the angle θ ₂ (photometric direction) with the surface of the image recording body 1. A case of reading will be described.
[0039]
As described above, the region where the character 102 is formed overlaps the hologram (2). Therefore, when the character 102 is read by the optical reading device 40, the illumination light of the optical reading device 40 is irradiated not only on the character 102 but also on the hologram (2).
[0040]
The reading unit 41 reads light incident on the surface of the image recording body 1 from an angle θ ₂ (photometric direction). At this time, the light due to the illumination light of the optical reader 40 being applied to the character information is incident on the reading unit 41, but the light due to being applied to the hologram (2) is not incident thereon. This is because the viewing angle of the hologram (2) is an angle that does not depend on θ ₂ as shown in FIG. In this way, the hologram {circle around (2)} is set so that the viewing angle of the hologram {circle around (2)} formed on the character 102 formed to prevent the forgery of the character 102 does not lie in the photometric direction θ ₂ of the optical reader 40. Thus, it is possible to reduce the reading failure of the character 102 due to the formation of the hologram (2) while preventing forgery.
[0041]
Further, forgery of the image 101 can be prevented by providing the hologram (1) so as to overlap the image 101. At that time, the viewing angle of the hologram (1) is preferably in the vicinity of θ ₂ . Even when the viewing angle of the hologram (1) overlapping the image 101 is in the vicinity of θ ₂ , the image 101 is not read by the optical reading device 40, so that reading by the optical reading device 40 is not hindered. In particular, when the photometric direction of the optical reading device 40, that is, θ ₂ is 90 degrees or in the vicinity of 90 degrees as shown in FIG. 3, the hologram (1) is very easy to observe when a human observes it. In addition, the accuracy of the inspection for the presence of counterfeiting by human vision can be improved.
[0042]
Further, by superimposing the hologram (1) on the image 101, the hologram (1) provides the effect of tallying, and the effect of preventing forgery can be further improved.
[0043]
As described above, in the present embodiment, in the image recording body 1 provided with the hologram that overlaps at least a part of the information, the hologram {circle around (2)} having an viewing angle not in the photometric direction of the optical reader and the photometric direction of the optical reader. Since the hologram {circle around (2)} having such an viewing angle is provided, a high forgery prevention effect can be obtained.
[0044]
In addition, by setting the viewing angle of the hologram that overlaps the character so as not to be in the photometric direction of the optical reading device, it is possible to improve the character reading accuracy while preventing forgery.
[0045]
Also in the present embodiment, as the optical change element layer 12, various types described in the first embodiment other than the hologram can be used.
[0046]
Further, in the present embodiment, when illumination light is applied as shown in FIG. 11, as shown in FIG. 12, hologram {2} at a photometric angle (90 degrees in this embodiment) by the optical reader. The difference between the brightness of the image and the brightness of the background is 0, but the brightness may be so high that it does not hinder reading of information to be read by the optical reader. For example, if the difference between the luminance of the hologram (2) and the luminance of the background at a photometric angle of 60 to 120 degrees is 75% or less of the luminance difference between characters and the background, reading by the optical reading device is hindered. Can be suppressed, and highly accurate reading can be realized.
[0047]
Next, a third embodiment will be described.
[0048]
In the present embodiment, only differences from the second embodiment will be described.
[0049]
In the image recording body 1 in FIG. 10, the wavelength of the reflected light generated when the illumination light of the optical reader 40 is incident on the hologram (2) overlapping the character 102 does not include the photometric wavelength of the optical reader 40. Hologram (2) is designed. Then, the hologram (1) is designed so that the wavelength of the reflected light generated when the illumination light of the optical reading device 40 enters the hologram (1) overlapping the image 101 includes the photometric wavelength of the optical reading device 40. Yes.
[0050]
By designing the hologram (1) and the hologram (2) in this way, when reading characters formed on the image recording body 1 by the optical reader 40, the reading accuracy due to the formation of the hologram is improved. The decrease can be suppressed. Further, since the image recording body 1 is also provided with a hologram that can be detected by the optical reading device 40, it is possible to prevent forgery. Furthermore, in this embodiment, since the hologram having the reflected light wavelength including the photometric wavelength of the optical reading device 40 is provided so as to overlap the image, the effect of preventing forgery of the image portion is high.
[0051]
Next, a fourth embodiment will be described.
[0052]
FIG. 13 is a diagram for explaining the layer structure of the image recording body, and FIG. 14 is a plan view thereof. Since the hologram is formed on the hologram 20 in the hologram forming layer 12b of the optical change element layer 12 on the information 20, it is possible to prevent forgery of the image recording body 1. The hologram of the hologram forming layer 12b is formed so as to satisfy the following expression (1).
[0053]
In the region where the optical change pattern (hologram in this embodiment) is formed on the optical change element layer 12, the reflectance at the point P where the character 101 is formed under the optical change pattern is Mx, and the optical change pattern When the reflectance at the point Q where the character 101 is not formed below is Mo, 0.3 ≦ (Mo−Mx) / Mx (1)
Moreover, the result of having measured the reflectance of each point on the line C of FIG. 14 is shown in FIG.
[0054]
By forming the optical change pattern so as to satisfy the expression (1), the optical change pattern is formed on the character 101 even when the character 101 recorded on the image recording body 1 is read by the optical reader. Therefore, it is possible to prevent the reading accuracy of the character 101 from being lowered. Furthermore, it is preferably 0.4 or more.
[0055]
Here, Mo and Mx are average values of values measured at 20 or more locations on the same image recording medium.
[0056]
The reflectance can be measured by the following measurement method. The wavelength of the illumination light is set to about 680 nm, and the amount of reflected light of the light reflected from the image recording body is measured with a photometer. The reflected light amount / incident light amount is defined as the reflectance.
[0057]
【The invention's effect】
As described above, in the inventions according to claims 1 to 8, when the information of the image recording body is read using reflected light, the optical change image of the optical change element layer is read by reading from a predetermined direction. Since it does not appear overlapping, the information reading accuracy is improved.
[Brief description of the drawings]
FIG. 1 is a plan view showing an image recording body.
FIG. 2 is a diagram illustrating a layer configuration of an image recording body.
FIG. 3 is a diagram illustrating reading by an optical reading device.
FIG. 4 is a diagram illustrating reading by another optical reading device.
FIG. 5 is a diagram illustrating a state when an image recording body is read by an optical reading device.
FIG. 6 is a diagram illustrating reading by another optical reading device.
FIG. 7 is a diagram illustrating reading by another optical reading device.
FIG. 8 is a diagram illustrating a layer configuration of an image recording body according to another embodiment.
FIG. 9 is a diagram illustrating a layer configuration of an image recording body according to another embodiment.
10 is a plan view of the image recording body of FIG. 9 as viewed from above.
FIG. 11 is a diagram illustrating reading of an image recording body when illumination light is applied.
FIG. 12 is a diagram showing viewing angles of the hologram {circle around (2)} and the hologram {circle around (1)} at a photometric angle by the optical reading device.
FIG. 13 is a diagram illustrating a layer configuration of an image recording body according to another embodiment.
14 is a partial plan view of the image recording body of FIG. 13 as viewed from above.
15 is a diagram showing the results of measuring the reflectance at each point on line C in FIG. 14;
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Image recording body 11 Card base material 12 Optical change element layer 13 Image receiving layer 20 Information 60 Optical change image 40,50,70,80 Optical reader

Claims (6)

The image recording medium has the following configuration:
Base material;
An image receiving layer provided on the substrate; and an optical change element layer provided on the substrate.
The optical change element layer has an optical change image at least in part,
The optical change image is formed on the information received on the image receiving layer,
In directions other than the reading of information, the optical change image will appear to overlap with the image of the information recorded on the image-receiving layer, and, in the direction of reading of the information, the optical change image, recorded in the image-receiving layer An image recording body characterized in that it is provided so that only the information image recorded in the image receiving layer appears without overlapping with the information image formed. The image recording body according to claim 1,
In the optical change element layer, a first optical change image and a second optical change image are formed,
An image recording body, wherein an viewing angle of the first optical change image is different from an viewing angle of the second optical change image. The image recording body according to claim 2,
2. The image recording medium according to claim 1, wherein the second optical change image is formed on at least a part of characters received by the image receiving layer. The image recording body according to claim 1,
An optical change image is formed on at least a part of the characters received by the image receiving layer,
The literature and the optical change image are overlapped,
When the reflectance at the point where the character is formed under the optical change image is Mx and the reflectance at the point where the character is not formed under the optical change image is Mo, the following equation is satisfied. An image recording material characterized by:
0.3 ≦ (Mo−Mx) / Mx In a method for reading the information of an image recording body having a base material, an image receiving layer in which information is recorded on the base material, and an optical change element layer provided on the base material,
With the following steps:
Irradiating the image recording body with light, and reading reflected light from the direction of reading the information;
The optical change element layer has an optical change image at least in part,
The optical change image is formed on the information received on the image receiving layer,
The optical change image is
In directions other than reading information, it appears overlapping the image of the information recorded on the image receiving layer,
The information reading direction is provided so that only the information image recorded on the image receiving layer appears without overlapping the information image recorded on the image receiving layer. Information reading method. In a method for reading the information of an image recording body having a base material, an image receiving layer in which information is recorded on the base material, and an optical change element layer provided on the base material,
With the following steps:
Irradiating the image recording body with light and reading reflected light;
An optical change image is formed on at least a part of the optical change element layer,
The optical change image is formed on the information received on the image receiving layer,
In the step of reading the reflected light, only the reflected light of the information image is read from an angle that does not overlap the viewing angle of the optical change image.

Images