JP2008112541A - Recording medium, authenticity determination device, recording medium reading device, authenticity determination program, and recording medium reading program - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a recoding medium which can prevent illegal copy, an authenticity determination device and a recording medium reading device which can prevent illegal copy of the recording medium, and further an authenticity determination program which can prevent illegal copy of the recording medium and a recording medium reading program thereof. <P>SOLUTION: The recording medium has an irregular area whose surface center line average roughness Ra ranges from 0.1 μm to 1,000 μm, and in the irregular area, amorphous alloy member comprising amorphous alloy which has amorphous phase ranging from 50 vol.% to 100 vol.% is prepared in a preset region. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a recording medium, authenticity determination device, recording medium reader, authenticity determination program, and recording medium reading program.

  Conventionally, holograms and stereograms have been used as techniques for indicating that recording media such as DVDs and CDs are authentic. With respect to this hologram, Patent Document 1 discloses that an optical recording medium having a light diffraction pattern such as a hologram attached to an optical recording medium such as a CD-ROM to distinguish it from a counterfeit product that has been reproduced without permission is difficult to remove. A technique for maintaining the surface strength other than the portion to be proved is disclosed.

  Patent Document 2 discloses a technique for preventing unauthorized copying by providing an RFID tag on a recording medium.

Further, Patent Document 3 discloses an unauthorized copy prevention recording medium that allows a legitimate user to use unrestricted content, and can provide fine-tuned content according to the user's needs, such as permitting copying of content and limiting the number of times. It is disclosed.
JP-A-8-291266 JP 2005-316994 A JP 2005-276085 A

  In such a technical background, the first object of the present invention is to provide a recording medium capable of preventing unauthorized copying, and a true / false determination apparatus and recording capable of preventing unauthorized copying of the recording medium. A second object is to provide a medium reading device, and a third object is to provide a true / false determination program and a recording medium reading program capable of preventing unauthorized copying of a recording medium.

  In order to achieve the first object, the recording medium according to claim 1 has an uneven region having a center line average roughness Ra of 0.1 μm or more and 1000 μm or less on the surface, and at least the uneven region has a volume. An amorphous alloy having an amorphous phase with a rate of 50% to 100% is provided in a predetermined region.

  The recording medium according to claim 2, wherein the shape of the recording medium is a disk shape having a rotation axis, and when a plurality of the predetermined regions are provided on the recording medium, the center of gravity of the recording medium and the recording medium The plurality of predetermined regions are provided so as to coincide with the rotation axis.

  The recording medium according to claim 3 is the recording medium according to claim 1 or 2, wherein the center line average roughness Ra of the uneven region is 0.1 μm or more and 100 μm or less.

  The recording medium according to claim 4 is the recording medium according to any one of claims 1 to 3, wherein the amorphous alloy is a Zr-based amorphous alloy, a Hf-based amorphous alloy, Fe based amorphous alloy, Co based amorphous alloy, Ni based amorphous alloy, Ti based amorphous alloy, Cu based amorphous alloy, Au based amorphous alloy, and La based amorphous alloy At least one selected.

  The recording medium according to claim 5 is the recording medium according to any one of claims 1 to 3, wherein the amorphous alloy is selected from the following general formulas (1) to (7): Having at least one composition.

General formula (1) M _100-n TM _n
In the general formula (1), M represents one or more elements of Fe, Co, Ni, Cu, Ti, Zr, and Hf. TM always contains at least one element selected from the group consisting of Cr, Mo, Nb, Al, Sn, and B at least 1 atomic%, and the balance is 3, 4, 5, 6, 8, Transition metal elements composed of elements belonging to Groups 9, 10, and 11 (except for elements applied to Cr, Mo, Nb, and M), and elements belonging to Groups 13, 14, and 15 Represents at least one element selected from the group consisting of typical elements (excluding Al, Sn, and B). n represents atomic%, and 5 ≦ n ≦ 50.

Formula _{(2) Cu p Ti q M1} 100-pq
In the general formula (2), M1 represents at least one element selected from the group consisting of an element belonging to the iron group, an element belonging to the platinum group, an element belonging to a noble metal, Al, Sn, Zn, Hf, and Zr. . p and q represent atomic%, and 50 ≦ p ≦ 65 and 2 ≦ q ≦ 20.

General formula (3) Ni _100-stu Nb _s (Zr, Hf) _t M2 _u
In the general formula (3), M2 represents at least one element selected from the group consisting of an element belonging to the iron group, an element belonging to the platinum group, an element belonging to a noble metal, Cu, and Ti. s, t, and u each represent atomic%, and are 10 ≦ s ≦ 25, 5 ≦ t ≦ 20, 5 ≦ u ≦ 25, and 10 ≦ t + u ≦ 35.

Formula (4) Fe _100-xy M3 _x M4 _y
In the general formula (4), M3 represents at least one element selected from the group consisting of transition metal elements composed of elements belonging to Group 3, Group 4, Group 5, and Group 6. M4 is composed of any one element or two or more elements of Mn, Ru, Rh, Pd, Ga, Al, Ge, Si, B, and C. x and y each represent atomic%, and 2 ≦ x ≦ 35 and 5 ≦ y ≦ 30.

Formula (5) (Fe _1-z (Co, Ni) _z ) _100-xy M3 _x M4 _y
In the general formula (5), M3 represents at least one element selected from the group consisting of transition metal elements consisting of elements belonging to Group 3, Group 4, Group 5, and Group 6. M4 is composed of any one element or two or more elements of Mn, Ru, Rh, Pd, Ga, Al, Ge, Si, B, and C. x, y, and z each represent atomic%, and 2 ≦ x ≦ 35, 5 ≦ y ≦ 30, and 0.1 ≦ z ≦ 0.7.

Formula (6) (Zr, Hf) _a M5 _b M6 _c
In general formula (6), M5 is an element belonging to Group 3, an element belonging to Group 5, an element belonging to Group 6, an element belonging to the iron group, an element belonging to the platinum group, an element belonging to a noble metal, Cu, Ti, and It represents at least one element selected from the group consisting of Mn. M6 represents at least one element selected from the group consisting of Be, Zn, Al, Ga, B, C, and N. “a”, “b”, and “c” each represent atomic%, and 30 ≦ a ≦ 70, 15 ≦ b ≦ 65, and 1 ≦ c ≦ 30.

Formula (7) Ti _100-ijk Cu _i M7 _j M8 _k
In the general formula (7), M7 represents at least one element selected from the group consisting of Zr, Hf, an element belonging to the iron group, and a transition metal element consisting of an element belonging to the platinum group. M8 represents at least one element selected from the group consisting of an element belonging to Group 3, an element belonging to Group 5, an element belonging to Group 6, Al, Sn, Ge, Si, B, and Be. i, j, and k each represent atomic%, and 5 ≦ i ≦ 35, 10 ≦ j ≦ 35, and 1 ≦ k ≦ 20.

  The recording medium according to claim 6 is the recording medium according to any one of claims 1 to 3, wherein the amorphous alloy is selected from the following general formulas (8) to (13): Having at least one composition.

Formula _{^{(8) M 1 a M 2}} b Ln c M 3 d M 4 e M 5 f
In the general formula (8), M ¹ represents one or two elements selected from Zr and Hf, and M ² represents Ni, Cu, Fe, Co, Mn, Nb, Ti, V, Cr, Zn, Al And Ln represents Y, La, Ce, Nd, Sm, Gd, Tb, Dy, Ho, Yb and Mm (Misch metal which is an aggregate of rare earth elements). M ³ represents at least one element selected from the group consisting of Be, B, C, N and O, and M ⁴ represents Ta, W and Mo. At least one element selected from the group is represented, and M ⁵ represents at least one element selected from the group consisting of Au, Pt, Pd and Ag. a, b, c, d, e and f are atomic%, 25 ≦ a ≦ 85, 15 ≦ b ≦ 75, 0 ≦ c ≦ 30, 0 ≦ d ≦ 30, 0 ≦ e ≦ 15, 0 ≦ f ≦ 15.

Formula _{(9) Al 100-ghi Ln} g M 6 h M 3 i
In the general formula (9), Ln represents at least one element selected from the group consisting of Y, La, Ce, Nd, Sm, Gd, Tb, Dy, Ho, Yb and Mm, and M ⁶ represents Ti, V , Cr, Mn, Fe, represents Co, Ni, Cu, Zr, Nb, Mo, Hf, at least one element selected from the group consisting of Ta and W, M ³ is be, B, C, N and O Represents at least one element selected from the group consisting of g, h and i, each representing atomic%, and 30 ≦ g ≦ 90, 0 <h ≦ 55, and 0 ≦ i ≦ 10.

Formula (10) Mg _100-p M ⁷ _p
In the general formula (10), M ⁷ represents at least one element selected from the group consisting of Cu, Ni, Sn and Zn, p represents atomic%, and 5 ≦ p ≦ 60.

Formula (11) Mg _100-qr M ⁷ _q M ⁸ _r
In the general formula (11), M ⁷ represents at least one element selected from the group consisting of Cu, Ni, Sn and Zn, and M ⁸ is at least one element selected from the group consisting of Al, Si and Ca. Represents. q and r each represent atomic%, and 1 ≦ q ≦ 35 and 1 ≦ r ≦ 25.

Formula (12) Mg _100-qs M ⁷ _q M ⁹ _s
In the general formula (12), M ⁷ represents at least one element selected from the group consisting of Cu, Ni, Sn and Zn, and M ⁹ is selected from the group consisting of Y, La, Ce, Nd, Sm and Mm. Represents at least one element. q and s each represent atomic percent, and 1 ≦ q ≦ 35 and 3 ≦ s ≦ 25.

Formula (13) Mg _100-qrs M ⁷ _q M ⁸ _r M ⁹ _s
In the general formula (13), M ⁷ represents at least one element selected from the group consisting of Cu, Ni, Sn and Zn, and M ⁸ represents at least one element selected from the group consisting of Al, Si and Ca. M ⁹ represents at least one element selected from the group consisting of Y, La, Ce, Nd, Sm and Mm. q, r, and s each represent atomic%, and 1 ≦ q ≦ 35, 1 ≦ r ≦ 25, and 3 ≦ s ≦ 25.

  On the other hand, in order to achieve the second object, the true / false determining apparatus according to claim 7 is an unevenness whose surface has a center line average roughness Ra of 0.1 μm or more and 1000 μm or less, which serves as a true / false determination criterion. A reference feature indicating the characteristics of the concavo-convex region of an amorphous alloy member comprising an amorphous alloy having a region and at least the concavo-convex region having an amorphous phase with a volume ratio of 50% or more and 100% or less Storage means for storing information in advance, and an object having a concavo-convex area having a center line average roughness Ra of 0.1 μm or more and 1000 μm or less on the surface, and at least the concavo-convex area has a volume ratio of 50% to 100% Reading means for reading determination target feature information indicating characteristics of the uneven region of an amorphous alloy member including an amorphous alloy having the following amorphous phase, and the determination target feature by the reading means information When read, the determination target feature information is compared with the reference feature information, and based on the comparison result, it is determined whether or not the amorphous alloy member to be determined is true. And determining means for determining whether or not the recording medium is a genuine recording medium.

  An authenticity determination device according to an eighth aspect of the present invention is the authenticity determination device according to the seventh aspect, further comprising acquisition means for acquiring the reference feature information stored in the storage means from a host device.

  The recording medium reading device according to claim 9, wherein the recording medium reading unit that reads information recorded on the recording medium and the authenticity determination device determine that the recording medium is not an authentic recording medium And a control means for controlling to prohibit reading by the recorded information reading means.

  On the other hand, in order to achieve the third object, the true / false determination program according to claim 10 is a concavo-convex in which the center line average roughness Ra is 0.1 μm or more and 1000 μm or less on the surface, which is a true / false determination criterion. A reference feature indicating the characteristics of the concavo-convex region of an amorphous alloy member having a region and at least the concavo-convex region including an amorphous alloy having an amorphous phase with a volume ratio of 50% to 100% A storage step for storing information in advance, and a surface having an uneven area having a center line average roughness Ra of 0.1 μm or more and 1000 μm or less, and at least the uneven area has a volume ratio of 50% or more and 100%. A reading step of reading determination target characteristic information indicating characteristics of the uneven area from a recording medium provided with an amorphous alloy member including an amorphous alloy having the following amorphous phase; When the determination target feature information is read by the taking step, the determination target feature information is compared with the reference feature information, and based on the comparison result, the authenticity determination target amorphous alloy member is true. Determining whether or not the recording medium is a genuine recording medium, and causing the computer to execute a process having a determination step of determining whether or not the recording medium is an authentic recording medium.

  The recording medium reading program according to claim 11 has a concavo-convex region having a center line average roughness Ra of 0.1 μm or more and 1000 μm or less on the surface, which is a criterion for authenticity, and at least the concavo-convex region has a volume ratio of 50%. A storage step for storing in advance reference feature information indicating the feature of the uneven region of an amorphous alloy member including an amorphous alloy having an amorphous phase of 100% or less; An amorphous alloy having an uneven region with a center line average roughness Ra of 0.1 μm or more and 1000 μm or less on the surface and at least the uneven region having an amorphous phase with a volume ratio of 50% or more and 100% or less. A reading step for reading determination target characteristic information indicating characteristics of the uneven region from a recording medium provided with an amorphous alloy member configured to include the determination target characteristic by the reading step. When the information is read, the determination target feature information is compared with the reference feature information, and it is determined whether or not the amorphous alloy member to be determined is true based on the comparison result. Thus, when the determination step determines whether or not the recording medium is an authentic recording medium, and the determination step determines that the recording medium is not an authentic recording medium, the recording medium is recorded on the recording medium. And a control step for controlling the reading of the information to be prohibited.

  According to the present invention, it is possible to provide a recording medium that can prevent unauthorized copying. Further, it is possible to provide an authenticity determination device and a recording medium reading device that can prevent unauthorized copying of the recording medium. Furthermore, the effect that the authenticity determination program which can prevent the unauthorized copy of a recording medium, and a recording medium reading program can be provided is acquired.

  First, an embodiment of an amorphous alloy member according to the present invention will be described with reference to the drawings.

  As shown in FIG. 1, an uneven region 34 </ b> A having a center line average roughness Ra of 0.1 μm or more and 1000 μm or less is formed on the surface of the amorphous alloy member 34 according to the present embodiment. The “surface of the amorphous alloy member” indicates a portion exposed to the outside world regardless of the front and back in the usage form of the amorphous alloy member 34.

  The uneven area 34A is an area formed by a fine uneven shape, and is an area represented by an uneven pattern by an arrangement of regular or irregular concave and convex portions. In addition, from the viewpoint of preventing forgery of the uneven area 34A, the arrangement of the concave portions and the convex portions is preferably irregular.

  In addition, although this uneven | corrugated | grooved area | region 34A mentions later for details, it is intentionally formed by the producer side by the production method of an amorphous alloy member.

  The center line average roughness Ra of the uneven area 34A is essential to be 0.1 μm or more and 1000 μm or less, and preferably 0.1 μm or more and 100 μm or less.

  When the center line average roughness Ra of the concavo-convex area 34A is less than 0.1 μm, the density of the concave and convex portions constituting the concavo-convex area 34A increases, and the concavo-convex shape can be collected in a normal optical system. Since it is difficult, it becomes difficult to use the uneven area 34A as an area for authenticity determination to be described later. On the other hand, if the center line average roughness Ra of the uneven region is larger than 1000 μm, the uneven region 34A may be easily forged.

  This center line average roughness Ra is based on the method of JIS B 0651. For the uneven area on the surface of the amorphous alloy member, the measurement length is 4 to 80 mm as defined in JIS-B-0601. The center line average roughness when measured at 8 to 8 mm can be measured using a three-dimensional surface roughness measuring instrument (SE-3500, manufactured by Kosaka Laboratory Ltd.).

  As described above, the uneven region 34A is a region formed by microscopic unevenness, and the width of the convex portion or the concave portion is very small on the order of micrometers, and it is not easy for the user to forge it. Absent.

  At least the uneven region 34A of the amorphous alloy member 34 is configured to include an amorphous alloy as a substantially amorphous alloy including an amorphous phase having a volume ratio of 50% to 100%. Yes.

  In the present embodiment, in order to simplify the description, the amorphous alloy member 34 is a non-crystalline alloy that includes an amorphous phase having a volume ratio of 50% or more and 100% or less. Although described as being composed of a crystalline alloy, as described above, it is only necessary that at least the uneven region 34A contains an amorphous alloy.

  Here, the “amorphous phase” means that the phase forming the alloy is an amorphous single layer. When an amorphous alloy contains an amorphous phase with a volume fraction of less than 50%, it means that the crystalline phase is larger in volume than the amorphous phase, and the alloy has properties close to that of a crystalline alloy. As a result, there is a problem that the excellent characteristics (for example, excellent transferability in the present invention) possessed by an alloy composed of an amorphous phase cannot be utilized.

  Although the amorphous alloy will be described in detail later, the amorphous alloy member 34 can be easily produced by casting from a molten metal or by forming by viscous flow using a glass transition region, It has excellent transferability and can reproduce the shape and dimensions of the mold used at the time of production very faithfully. For this reason, it is possible to faithfully transfer the surface state of the mold finely by performing mold casting or molding using a mold that has been subjected to surface processing corresponding to the uneven area 34A. Thus, the amorphous alloy member 34 in which the uneven region 34A is formed can be produced (details will be described later).

  As the amorphous alloy constituting the amorphous alloy member 34 according to the present embodiment, as described above, any alloy containing at least an amorphous phase with a volume ratio of 50% or more and 100% or less can be used. Although not limited to specific materials, specifically, Zr-based amorphous alloys, Hf-based amorphous alloys, Fe-based amorphous alloys, Co-based amorphous alloys, Ni-based materials It is preferably at least one selected from an amorphous alloy, a Ti-based amorphous alloy, a Cu-based amorphous alloy, an Au-based amorphous alloy, and a La-based amorphous alloy.

  Furthermore, as the amorphous alloy constituting the amorphous alloy member 34, an amorphous alloy having at least one composition selected from the following general formulas (1) to (7) is preferably used. Can do.

General formula (1) M _100-n TM _n
In the general formula (1), M represents one or more elements of Fe, Co, Ni, Cu, Ti, Zr, and Hf. TM always contains at least one element selected from the group consisting of Cr, Mo, Nb, Al, Sn, and B at least 1 atomic%, and the balance is 3, 4, 5, 6, 8, Transition metal elements composed of elements belonging to Groups 9, 10, and 11 (except for elements applied to Cr, Mo, Nb, and M), and elements belonging to Groups 13, 14, and 15 Represents at least one element selected from the group consisting of typical elements (excluding Al, Sn, and B). n represents atomic%, and 5 ≦ n ≦ 50.

Formula _{(2) Cu p Ti q M1} 100-pq
In the general formula (2), M1 represents at least one element selected from the group consisting of an element belonging to the iron group, an element belonging to the platinum group, an element belonging to a noble metal, Al, Sn, Zn, Hf, and Zr. . p and q represent atomic%, and 50 ≦ p ≦ 65 and 2 ≦ q ≦ 20.

General formula (3) Ni _100-stu Nb _s (Zr, Hf) _t M2 _u
In the general formula (3), M2 represents at least one element selected from the group consisting of an element belonging to the iron group, an element belonging to the platinum group, an element belonging to a noble metal, Cu, and Ti. s, t, and u each represent atomic%, and are 10 ≦ s ≦ 25, 5 ≦ t ≦ 20, 5 ≦ u ≦ 25, and 10 ≦ t + u ≦ 35.

Formula (4) Fe _100-xy M3 _x M4 _y
In the general formula (4), M3 represents at least one element selected from the group consisting of transition metal elements composed of elements belonging to Group 3, Group 4, Group 5, and Group 6. M4 is composed of any one element or two or more elements of Mn, Ru, Rh, Pd, Ga, Al, Ge, Si, B, and C. x and y each represent atomic%, and 2 ≦ x ≦ 35 and 5 ≦ y ≦ 30.

Formula (5) (Fe _1-z (Co, Ni) _z ) _100-xy M3 _x M4 _y
In the general formula (5), M3 represents at least one element selected from the group consisting of transition metal elements consisting of elements belonging to Group 3, Group 4, Group 5, and Group 6. M4 is composed of any one element or two or more elements of Mn, Ru, Rh, Pd, Ga, Al, Ge, Si, B, and C. x, y, and z each represent atomic%, and 2 ≦ x ≦ 35, 5 ≦ y ≦ 30, and 0.1 ≦ z ≦ 0.7.

Formula (6) (Zr, Hf) _a M5 _b M6 _c
In general formula (6), M5 is an element belonging to Group 3, an element belonging to Group 5, an element belonging to Group 6, an element belonging to the iron group, an element belonging to the platinum group, an element belonging to a noble metal, Cu, Ti, and It represents at least one element selected from the group consisting of Mn. M6 represents at least one element selected from the group consisting of Be, Zn, Al, Ga, B, C, and N. “a”, “b”, and “c” each represent atomic%, and 30 ≦ a ≦ 70, 15 ≦ b ≦ 65, and 1 ≦ c ≦ 30.

Formula (7) Ti _100-ijk Cu _i M7 _j M8 _k
In the general formula (7), M7 represents at least one element selected from the group consisting of Zr, Hf, an element belonging to the iron group, and a transition metal element consisting of an element belonging to the platinum group. M8 represents at least one element selected from the group consisting of an element belonging to Group 3, an element belonging to Group 5, an element belonging to Group 6, Al, Sn, Ge, Si, B, and Be. i, j, and k each represent atomic%, and 5 ≦ i ≦ 35, 10 ≦ j ≦ 35, and 1 ≦ k ≦ 20.

  Among the amorphous alloys of the above general formulas (1) to (7), the amorphous forming ability is high and the fabrication of the authenticity determination member is easy, so the above general formula (1) and general formula ( It is preferable to use 6).

  Furthermore, as an amorphous alloy, any one of the following general formulas (8) to (13) is provided because it has a high amorphous forming ability and provides good mechanical properties such as strength and hardness. An amorphous alloy having a composition represented by can be suitably used.

Formula _{^{(8) M 1 a M 2}} b Ln c M 3 d M 4 e M 5 f
In the general formula (8), M ¹ represents one or two elements selected from Zr and Hf, and M ² represents Ni, Cu, Fe, Co, Mn, Nb, Ti, V, Cr, Zn, Al And Ln represents Y, La, Ce, Nd, Sm, Gd, Tb, Dy, Ho, Yb and Mm (Misch metal which is an aggregate of rare earth elements). M ³ represents at least one element selected from the group consisting of Be, B, C, N and O, and M ⁴ represents Ta, W and Mo. At least one element selected from the group is represented, and M ⁵ represents at least one element selected from the group consisting of Au, Pt, Pd and Ag. a, b, c, d, e and f are atomic%, 25 ≦ a ≦ 85, 15 ≦ b ≦ 75, 0 ≦ c ≦ 30, 0 ≦ d ≦ 30, 0 ≦ e ≦ 15, 0 ≦ f ≦ 15.

  The amorphous alloy represented by the general formula (8) includes amorphous alloys represented by the following general formulas (8-a) to (8-p).

Formula (8-a) M ¹ _a M ² _b
The amorphous alloy of the general formula (8-a) has characteristics that the mixed enthalpy is negative and large and the amorphous forming ability is good because the M ² element coexists with Zr or Hf.

Formula (8-b) M ¹ _a M ² _b Ln _c
Like this amorphous alloy, the thermal stability of amorphous is improved by adding a rare earth element to the alloy of the general formula (8-a).

Formula (8-c) M ¹ _a M ² _b M ³ _d
Formula (8-d) M ¹ _a M ² _b Ln _c M ³ _d
Like the amorphous alloys represented by the general formulas (8-c) and (8-d), the gaps in the amorphous structure are formed by the element M ³ (Be, B, C, N, O) having a small atomic radius. By filling in, the structure is stabilized and the amorphous forming ability of the amorphous alloy is improved.

Formula (8-e) M ¹ _a M ² _b M ⁴ _e
Formula (8-f) M ¹ _a M ² _b Ln _c M ⁴ _e
Formula (8-g) M ¹ _a M ² _b M ³ _d M ⁴ _e
Formula _{^{(8-h) M 1 a}} M 2 b Ln c M 3 d M 4 e
When the refractory metal M ⁴ (Ta, W, Mo) is added as in the amorphous alloys represented by these general formulas (8-e) to (8-h), amorphous formation of the amorphous alloys is achieved. Heat resistance and corrosion resistance are improved without affecting performance.

Formula (8-i) M ¹ _a M ² _b M ⁵ _f
Formula (8-j) M ¹ _a M ² _b Ln _c M ⁵ _f
Formula (8-k) M ¹ _a M ² _b M ³ _d M ⁵ _f
Formula _{^{(8-l) M 1 a}} M 2 b Ln c M 3 d M 5 f
General formula (8-m) M ¹ _a M ² _b M ⁴ _e M ⁵ _f
Formula (8-n) M ¹ _a M ² _b Ln _c M ⁴ _e M ⁵ _f
Formula (8-o) M ¹ _a M ² _b M ³ _d M ⁴ _e M ⁵ _f
Formula _{^{(8-p) M 1 a}} M 2 b Ln c M 3 d M 4 e M 5 f
An amorphous alloy containing these noble metals M ⁵ (Au, Pt, Pd, Ag) has a characteristic that it does not become brittle even if crystallization occurs.

Formula _{(9) Al 100-ghi Ln} g M 6 h M 3 i
In the general formula (9), Ln represents at least one element selected from the group consisting of Y, La, Ce, Nd, Sm, Gd, Tb, Dy, Ho, Yb and Mm, and M ⁶ represents Ti, V , Cr, Mn, Fe, represents Co, Ni, Cu, Zr, Nb, Mo, Hf, at least one element selected from the group consisting of Ta and W, M ³ is be, B, C, N and O Represents at least one element selected from the group consisting of g, h and i, each representing atomic%, and 30 ≦ g ≦ 90, 0 <h ≦ 55, and 0 ≦ i ≦ 10.

  The amorphous alloy includes amorphous alloys of the following general formulas (9-a) and (9-b).

Formula _{(9-a) Al 100-} gh Ln g M 6 h
The amorphous alloy of the general formula (9-a) has a large negative enthalpy of mixing and good amorphous forming ability.

Formula _{(9-b) Al 100-} ghi Ln g M 6 h M 3 i
In the amorphous alloy of the general formula (9-b), the structure is stabilized by filling the gap in the amorphous structure with the element M ³ (Be, B, C, N, O) having a small atomic radius, Amorphous forming ability is improved.

Formula (10) Mg _100-p M ⁷ _p
In the general formula (10), M ⁷ represents at least one element selected from the group consisting of Cu, Ni, Sn and Zn, p represents atomic%, and 5 ≦ p ≦ 60.

  The amorphous alloy of the general formula (10) has a large negative enthalpy of mixing and good amorphous forming ability.

Formula (11) Mg _100-qr M ⁷ _q M ⁸ _r
In the general formula (11), M ⁷ represents at least one element selected from the group consisting of Cu, Ni, Sn and Zn, and M ⁸ is at least one element selected from the group consisting of Al, Si and Ca. Represents. q and r each represent atomic%, and 1 ≦ q ≦ 35 and 1 ≦ r ≦ 25.

Like the amorphous alloy of the general formula (11), the structure of the alloy of the general formula (10) is filled by filling the gap in the amorphous structure with the element M ⁸ (Al, Si, Ca) having a small atomic radius. Is stabilized and the amorphous forming ability is improved.

Formula (12) Mg _100-qs M ⁷ _q M ⁹ _s
Formula (13) Mg _100-qrs M ⁷ _q M ⁸ _r M ⁹ _s
In the general formula (12) and the general formula (13), M ⁷ represents at least one element selected from the group consisting of Cu, Ni, Sn and Zn, and M ⁸ is selected from the group consisting of Al, Si and Ca. M ⁹ represents at least one element selected from the group consisting of Y, La, Ce, Nd, Sm and Mm. q, r, and s each represent atomic%, and 1 ≦ q ≦ 35, 1 ≦ r ≦ 25, and 3 ≦ s ≦ 25.

  Like the amorphous alloys of the general formulas (12) and (13), the amorphous thermal stability is improved by adding rare earth elements to the alloys of the general formulas (10) and (11).

  Among the amorphous alloys described above, the Zr-TM-Al system and the Hf- have a very wide temperature difference between the glass transition temperature (Tg) of the amorphous alloy and the crystallization temperature (Tx) of the amorphous alloy. The TM-Al (TM: transition metal) amorphous alloy exhibits high strength and high corrosion resistance.

  Further, it is preferable that the supercooled liquid temperature region ΔTx (ΔTx = Tx−Tg) is an amorphous alloy having a temperature of 30K or more because there is a margin in the temperature control range and it is easy to mold. In particular, the Zr-TM-Al-based amorphous alloy has an extremely wide supercooled liquid temperature range ΔTx of 60 K or more, and in this supercooled temperature range, very good workability is achieved even at low stress of several tens of MPa or less due to viscous flow. Show.

The Zr-TM-Al-based and Hf-TM-Al-based amorphous alloys have a very large range of ΔTx, although they vary depending on the alloy composition and measurement method. For example, ΔTx of Zr ₆₀ Al ₁₅ Co _2.5 Ni _7.5 Cu ₁₅ alloy (Tg: 652K, Tx: 768K) is as extremely wide as 116K.

  In general, rapid cooling is required for the production of an amorphous alloy. However, an amorphous alloy having a ΔTx of 30 K or more as described above can be easily removed from the molten metal at a cooling rate of about 10 K / s. In addition, a bulk material composed of an amorphous single phase can be obtained, which is very stable and easy to manufacture. The solidified surface is also very smooth, and has a transfer property that faithfully reproduces even micron-order polishing flaws on the mold surface.

  Therefore, if such an amorphous alloy having a wide ΔTx is used, the surface characteristics of the mold can be reproduced faithfully.

The Zr-TM-Al and Hf-TM-Al amorphous alloys have a Vickers hardness (Hv) of 460 (DPN) from room temperature to around Tg, a tensile strength of 1,600 MPa, and a bending strength of It reaches 3,000 MPa. The thermal expansion coefficient α is as small as 1 × 10 ⁻⁵ / K from room temperature to near Tg, the Young's modulus is 91 GPa, and the elastic limit during compression exceeds 4 to 5%. Further, the toughness is high, and the Charpy impact value is 60 to 70 kJ / m ² . As described above, when the glass transition region is heated while exhibiting very high strength characteristics, the flow stress is reduced to about 10 MPa.

  Therefore, if the Zr-TM-Al-based and Hf-TM-Al-based amorphous alloys are used, the processing is extremely easy, and the amorphous alloy member constituted by these amorphous alloys has low stress. Even a complicated shape can be easily formed.

  In general, when an amorphous alloy is heated to the glass transition region, crystallization starts by holding for a long time. However, an alloy having a wide ΔTx as described above has a stable amorphous phase, and the temperature within ΔTx is increased. If properly selected, no crystals are generated for up to about 2 hours, and there is no need to worry about crystallization in normal molding.

  As materials used for the amorphous alloy member 34 to which the present invention is applied, in addition to the amorphous alloy as described above, JP-A-10-186176, JP-A-10-311923, JP-A-11-104281. Conventionally known amorphous alloys such as amorphous alloys described in JP-A No. 11-189855 can be used.

  A casting technique or a forging technique can be used as a method of producing the amorphous alloy member 34 in which the uneven region 34A is formed using the above-described amorphous alloy.

  As described above, the amorphous alloy has high-precision castability and workability, and has excellent transferability capable of faithfully reproducing the shape of the mold finely, so that the mold is appropriately manufactured. As a result, the amorphous alloy member 34 having the target concavo-convex region 34 </ b> A can be manufactured with high productivity by a single process using a casting technique or a forging technique.

  An example of a method for producing an amorphous alloy member using a casting technique will be specifically described.

  As shown in FIG. 2A, a casting mold 20 is prepared. As the material of the casting mold 20, a material whose softening temperature Ts is sufficiently larger than the crystallization temperature Tx of the amorphous alloy used as the material of the amorphous alloy member 34 is used. For example, the melting point of silicon or quartz glass is 1000 ° C. or higher, and can be suitably used as the casting mold 20.

  A water passage 22 constituting a cooling device is formed inside the casting mold 20. By passing water through the water passage 22, the amorphous alloy member formed in the recess 24 of the casting mold 20 can be cooled.

  In the production of the amorphous alloy member 34, first, as a mold production process, an uneven shape region 24A is formed in at least a partial region of the recess 24 of the casting mold 20. The uneven shape of the uneven region 24A is transferred onto the amorphous alloy member 34, whereby the uneven region 34A is formed on the amorphous alloy member 34 (see FIG. 2E).

  The concavo-convex shape region 24A is a region formed by a fine concavo-convex shape, similar to the concavo-convex region 34A, and is a region represented by a concavo-convex pattern formed by arrangement of regular or irregular concave and convex portions. . In addition, the center line average roughness Ra of the uneven region 34A is in the range of 0.1 μm to 1000 μm, and preferably 0.1 μm to 100 μm.

  From the viewpoint of preventing counterfeiting, the formation of the concavo-convex region 24A is performed by a method that is difficult to reproduce even when the producer side forms the concavo-convex region 24A in the same environment and under the same conditions. It is preferable to form on top.

  As a method for forming the uneven region 24A, any method can be used as long as it is difficult to produce the same shape even in the same environment and under the same conditions as described above. It is possible to use a dent process using a cutting tool, a cutting process using a cutting tool or the like, an electric discharge process, a blast process using abrasive grains, and the like.

  For this reason, the shape and characteristic of each uneven | corrugated shaped area | region 24A become peculiar for every casting die 20 in which the uneven | corrugated shaped area | region 24A was formed.

  As shown in FIG. 2B, the second mold 26 is provided with a through hole 49 as a concave portion corresponding to the concave portion 24 of the casting mold 20, and a plunger with respect to the through hole 49. 39 is provided so as to be reciprocally movable.

  When the casting mold 20 and the second mold 26 are clamped together, the cavity 37 is configured.

  Next, in the pouring step shown in FIG. 2 (B), the second mold 26 is placed on the casting mold 20 in which the concave / convex shaped region 24A is formed, and the concave portion 24 and the second mold are formed on the casting mold 20. After the through holes 49 as the concave portions of the mold 26 are overlapped so as to face each other, the casting mold 20 and the second mold 26 are clamped. Then, the molten metal 28 is poured into a cavity 37 constituted by the casting mold 20 and the second mold 26.

  The molten metal 28 is a molten metal for producing the amorphous alloy, and can be adjusted by adjusting and melting the alloy components as shown in the general formula.

  The molten metal 28 is introduced into the through hole 49 from a runner (not shown) provided in the second mold 26.

  At this time, the temperature of the melt 28 of the amorphous alloy must be equal to or higher than the melting point (Tm) of the amorphous alloy constituting the amorphous alloy member, and preferably the melting point (Tm) + 100 ° C. or higher. Preferably there is.

  Before pouring, the molten metal 28 may be subjected to a cleaning process according to a conventional method. In the cleaning process, in order to remove unnecessary gas such as hydrogen in the molten metal, flux treatment, degassing process using argon gas, chlorine gas, etc., so-called rigid media filter such as ceramic tube filter, ceramic foam filter, A filtering process using a filter that uses alumina flakes, alumina balls or the like as a filter medium, a glass cloth filter, or a combination of a degassing process and a filtering process is performed.

  These cleaning treatments are preferably performed in order to prevent defects caused by foreign matters such as non-metallic inclusions and oxides in the molten metal and defects caused by gas dissolved in the molten metal. Regarding filtering of the molten metal, JP-A-6-57432, JP-A-3-162530, JP-A-5-140659, JP-A-4-231425, JP-A-4-276031, JP-A-5-311261, JP-A-5-311261 6-136466 and the like. Further, the degassing of the molten metal is described in JP-A-5-51659, Japanese Utility Model Laid-Open No. 5-49148, and the like.

  Next, in the curing step shown in FIG. 2C, in order to improve transferability, the plunger 39 is moved in the direction of the concave portion 24 of the casting mold 20 to thereby apply pressure ( Casting pressure). The casting pressure at this time may be a pressure that allows the authenticity determination member to be molded, and is, for example, several tens of MPa. At this time, the tip of the plunger 39 in the direction in which the concave portion 24 is located is stopped at a position where it does not contact the molten metal 28. By flowing water through the water passage 22 in this pressurized state, the molten metal 28 is cooled, thereby cooling and hardening the molten metal 28.

  The cooling rate at this time is preferably in the range of 300 ° C./second or more and 10000000 ° C./second or less. If it is less than 300 ° C./second, a large number of coarse intermetallic compounds may be formed. If it is faster than 10000000 ° C./sec, it is theoretically possible to obtain an amorphous alloy, but there may be a cooling rate that cannot be obtained by a general industrial method.

In order to prevent the molten metal from being oxidized, the curing step in FIG. 2C is preferably performed in an inert gas atmosphere such as Ar or He or in a vacuum atmosphere. Vacuum conditions at this time ^is preferably a vacuum under the following conditions 10 -1 torr.

  Finally, in the peeling step shown in FIG. 2D, the casting mold 20 and the second mold 26 are opened from each other while the plunger 39 is moved. As a result, as shown in FIG. 1E, the molten alloy 28 hardened by cooling, that is, an amorphous alloy member formed of an amorphous alloy and having the concavo-convex region 34A formed by transferring the concavo-convex region 24A. 34 can be made.

  That is, at least a partial region of the produced amorphous alloy member 34 corresponds to a convex portion corresponding to the concave portion of the concave-convex shape region 24A formed in the casting mold 20 and a convex portion of the concave-convex shape region 24A. The concave and convex region 34A to which the concave portion to be transferred is formed is formed.

  Here, as described above, the amorphous alloy constituting the amorphous alloy member 34 is a metal, but is stable amorphous (amorphous) like oxide glass, and easily deforms at high temperatures. (Viscous flow). Therefore, as shown in the cross-sectional model diagram of the crystalline alloy shown in FIG. 3A and the cross-sectional model diagram of the amorphous alloy shown in FIG. Since the atomic arrangement is random, there is no specific sliding surface present in the crystal alloy, the mechanical strength is excellent, and the fine uneven shape of the uneven shape region 24A of the casting mold 20 is well reproduced. Has good transferability.

  For this reason, it is possible to obtain good durability of the amorphous alloy member 34 having the uneven area 34A, and it is possible to accurately transfer the uneven area 24A of the casting mold 20 in a fine manner.

  In addition, since the amorphous alloy has a supercooled liquid region, it is not necessary to consider solidification shrinkage, and the amorphous alloy has a smooth surface. For this reason, the surface state of the uneven | corrugated shaped area | region 24A of the metal mold | die 20 for casting can be reproduced with high precision.

  In the above description, the case where a solid mold is used in casting has been described. However, a driving mold represented by a continuous casting method may be used.

  As the continuous casting method, a single roll method, a twin roll method (hunter method), a method using a cooling roll represented by the 3C method, a twin belt method (Hasley method), a cooling belt represented by Al Swiss Caster II, The method using a cooling block is mentioned.

  Also when using these continuous casting methods, the amorphous alloy member 34 in which the uneven | corrugated area | region 34A was formed can be produced by casting similarly to the case where solid casting is used.

  Next, an example of a method for producing an amorphous alloy member using a forging technique will be described.

  As the forging technique, a die forging method using a forging die can be used. In order to reduce deformation resistance of the material, hot forging is performed by heating to a temperature higher than the recrystallization temperature and molding is performed at a temperature lower than the recrystallization temperature. Any of cold forging formed at room temperature and molten metal forging pressurized in a semi-solid state may be used.

  In the case of producing an amorphous alloy member by a forging technique, as in the case of producing an amorphous alloy member by the above casting technique, the forging mold in which the uneven region 24A is formed is used. That's fine.

  Specifically, as a forging technique using hot forging, first, a forging die 60 is prepared as shown in FIG. The material having the forging die 60 is a material whose softening temperature Ts is sufficiently larger than the crystallization temperature Tx of the amorphous alloy used as the material of the amorphous alloy member 34, as in the casting die 20. Is used. For example, the melting point of silicon or quartz glass is 1000 ° C. or higher and can be suitably used as the forging die 60.

  Next, as a mold manufacturing step shown in FIG. 4B, an uneven shape region 60A is formed on the surface of the forging mold 60. The uneven shape 34A is formed on the amorphous alloy member 34 by transferring the uneven shape of the uneven shape region 60A onto the amorphous alloy member 34.

  Similar to the uneven area 34A and the uneven area 24A, the uneven area 60A is an area formed by a fine uneven shape. The uneven area 60A is formed by an uneven pattern formed by an arrangement of regular or irregular recesses and protrusions. This is the area that is represented. Further, the center line average roughness Ra of the uneven region 34A is indispensable to be 0.1 μm or more and 1000 μm, and preferably 0.1 μm or more and 100 μm.

  Even in the formation of the uneven shape region 60A, in the same way as the uneven shape region 24A, it is difficult to reproduce even when the producer side forms the uneven shape region 60A in the same environment and under the same conditions from the viewpoint of forgery prevention. It is preferable to form on the forging die 60 by a simple method.

  As the method for forming the uneven shape region 60A, as with the uneven shape region 24A, any method can be used as long as it is difficult to produce the same shape even in the same environment and under the same conditions. For example, dent processing by a press or the like on the surface of the mold 60, cutting by a cutting tool or the like, electric discharge machining, blasting using abrasive grains, or the like can be used.

  For this reason, the shape and characteristic of each uneven | corrugated shaped area | region 60A become peculiar for every casting die 20 in which the uneven | corrugated shaped area | region 60A was formed.

  Next, an amorphous alloy substrate 35 made of the above amorphous alloy is prepared. This amorphous alloy substrate 35 is processed so that at least the center line average roughness Ra of a region to be an uneven region is 0.01 μm or less.

  In such an amorphous alloy substrate 35, in the production of the amorphous alloy member 34 described with reference to FIG. It can be manufactured by preparing a casting mold that is mirror-finished so as to be equal to or less than 01 μm, and casting using the casting mold in the same manner as the above casting technique.

  Next, as a plastic working step shown in FIG. 4C, the center line average roughness Ra of the prepared amorphous alloy substrate 35 is set to 0 in the region where the uneven shape region 60A of the forging die 60 is formed. It is made to oppose the area | region processed into 0.01 micrometer or less.

  Further, in the case of hot forging, at least a region facing the forging die 60 of the amorphous alloy substrate 35 in a vacuum or an inert gas such as Ar in order to suppress oxidation of the amorphous alloy. The amorphous alloy substrate 35 is heated so that the surface temperature is equal to or higher than the glass transition point Tg of the amorphous alloy constituting the amorphous alloy substrate 35. As this heating method, a high frequency heater or the like may be used.

  Simultaneously with the heating of the amorphous alloy substrate 35, the forging die 60 is placed on the supercooled liquid temperature region ΔTx (ΔTx (supercooled liquid temperature region) = Tx of the amorphous alloy constituting the amorphous alloy substrate 35. It is preferable to heat to (crystallization temperature of amorphous alloy) -Tg (glass transition point)).

  In this state, a constant pressure is applied to the amorphous alloy substrate 35 by the forging die 60 for a predetermined time.

  The constant pressure may be any pressure that allows plastic deformation on the surface of the amorphous alloy substrate in the supercooled liquid state, and the kind of amorphous alloy that constitutes the amorphous alloy substrate 35. It depends on. In addition, the predetermined time may be a time during which the uneven region 60A on the forging die 60 can be transferred to the surface of the amorphous alloy substrate 35 by applying the above-described constant pressure. It is determined by the size of the supercooled liquid temperature region of the material constituting the substrate 35.

  Through the plastic working step, the uneven region 60A of the forging die 60 is transferred to the surface of the amorphous alloy substrate 35, and as shown in FIG. 4D, the uneven region 34A is formed. The manufactured amorphous alloy member 34 can be manufactured.

  As described above, the amorphous alloy constituting the amorphous alloy member 34 has good transferability, and therefore, by using a forging technique, the uneven shape region 60A of the forging die 60 is finely crossed. Thus, the amorphous alloy member 34 having the concavo-convex region 34A accurately transferred can be produced.

  When the amorphous alloy member 34 is manufactured by hot forging, the amorphous alloy constituting the amorphous alloy member is an amorphous alloy having a supercooled liquid temperature region ΔTx of 30K or more. It is preferable that there is a margin in the temperature control range and it is easy to mold. As the amorphous alloy having such characteristics, it is particularly preferable to use an amorphous alloy having the composition represented by the general formula (8) because the amorphous forming ability is excellent.

  In the case of producing the amorphous alloy member 34 by cold forging, which is molded at room temperature below the recrystallization temperature, in the plastic working step, the amorphous alloy substrate 35 is not heated at room temperature, and For the forging die 60, a constant pressure may be applied to the amorphous alloy substrate 35 by the forging die 60 at a normal temperature for a predetermined time.

  In addition, what is necessary is just to adjust the pressure level and pressure time in cold forging so that plastic deformation is possible.

  In addition, when the amorphous alloy member 34 is produced by molten metal forging under pressure in a semi-solid state, a material having excellent amorphous forming ability is selected, and time management is strictly performed so that crystallization of the material does not progress. Just do it.

  Since the material constituting the amorphous alloy member 34 is an amorphous alloy, it has excellent transferability, and transfer of fine irregularities with a center line average roughness Ra of 0.1 μm to 1000 μm or less as described above is also possible. It can be achieved with high accuracy, and the concavo-convex region formed on the casting mold 20 and the forging mold 60 can be transferred with high accuracy.

  For this reason, if the same casting die 20 or forging die 60 is used, the manufacturer side has unevenness having the same characteristics for each die (casting die 20 and forging die 60). The amorphous alloy member 34 in which the region 34A is formed can be mass-produced.

  In order to improve the wear resistance of the surface of the amorphous alloy member 34 on which the uneven region 34A is formed, a ceramic-based cured film may be formed on the surface.

  The cured film can be formed, for example, by the following method.

  The amorphous alloy member 34 produced by the casting technique or the forging technique is placed in an amorphous region of an isothermal transformation curve (TTT curve) of the material constituting the amorphous alloy member 34 in an atmosphere containing oxygen or nitrogen. One of oxide and nitride formed by ceramization of at least one constituent element constituting the amorphous alloy member 34 on the surface of the amorphous alloy member 34 by heat treatment at temperature and time. Alternatively, a ceramic hard layer mainly composed of both ceramic components can be formed as a cured film.

  As described above, since the cured film is formed by the heat treatment method, a strong hard film can be integrally formed on the amorphous alloy member 34 using a simple apparatus, and the uneven region 34A can be protected.

  The heat treatment is performed in the following (1) to (4) for the reason that a hard film is formed on the surface while maintaining an amorphous phase in an atmosphere containing oxygen or / and nitrogen of 1 ppm or more or in an air atmosphere. It is preferable to carry out at any one of the range of the heat treatment temperature and heat treatment time shown in. (1) Heat treatment temperature 350 ° C., heat treatment time 10 minutes, (2) Heat treatment temperature 350 ° C., heat treatment time 120 minutes, (3) Heat treatment temperature 420 ° C., heat treatment time 120 minutes, (4) Heat treatment temperature 450 ° C., heat treatment time 10 Min.

  Which one of these heat treatment temperatures and heat treatment times (1) to (4) is used is determined by the size of the supercooled liquid temperature region of the amorphous alloy, the ease of oxidation and nitridation, etc., and the work efficiency, etc. Is selected by considering

  Since the ceramic hard layer thus formed, for example, a zirconia film is transparent, it does not affect the reading result of the uneven area 34A by the authenticity determination device described later. Even when a ceramic hard layer that is opaque to the light source wavelength is formed, this hard layer is a layer formed by ceramization of at least one constituent element constituting the amorphous alloy member 34. Unlike the case where a hard film is separately coated on the amorphous alloy member 34, the center line average roughness Ra of the uneven area 34A hardly changes before and after the heat treatment.

  For this reason, the uneven | corrugated area | region 34A formed on the amorphous alloy member 34 can be further protected from abrasion compared with the case where a hard film is not formed.

  Next, a recording medium in which the amorphous alloy member is provided in a predetermined area will be described with reference to FIG. Note that the recording medium in the present embodiment refers to the state of change in energy such as magnetism and light according to the description content of the recorded information with respect to the reading device provided in the hardware resources of the computer. The description content of the information can be transmitted to the reading device in the form of a signal corresponding to the cause. Examples of such a recording medium include a magneto-optical disk, an optical disk, and a magnetic disk.

  A recording medium 100 shown in FIG. 11A is a recording medium provided with only one amorphous alloy member 34, and a recording medium 102 shown in FIG. Is a recording medium provided with a plurality (four in the figure), and each recording medium has a disk shape.

  The number of amorphous alloy members 34 of the recording medium 100 may be one as shown in FIG. 4A, but in consideration of the rotation of the recording medium, as shown in FIG. The amorphous alloy member 34 may be provided so that the center of gravity of 102 and the rotation axis coincide.

  Next, the authenticity determination device and the recording medium reading device will be described with reference to FIG. The authenticity determination device 10 includes a reading unit 14 for reading the features of the uneven area on the surface of the amorphous alloy member, a communication unit 70, and a determination unit 18. The determination unit 18 includes a control unit 82 and a memory 86. The communication unit 70 is a device for exchanging data and signals with a host device via a wired communication network or a wireless communication network (not shown). The communication unit 70 in the present embodiment receives reference feature information described later from, for example, a server that is a higher-level device.

  The reading unit 14, the communication unit 70, and the memory 86 are connected to the control unit 82 so as to be able to exchange signals.

  Further, a recording medium reading device 94 is obtained by connecting the motor 90 and the data reading optical pickup 92 to the above configuration. The motor 90 is a motor for rotating the recording medium 100 and is controlled by the control unit 82. The data reading optical pickup 92 reads information recorded on the recording medium 100, and reading permission and reading prohibition of information are controlled by the control unit 82.

  The reading unit 14 and the determination unit 18 may be integrally configured, or may be configured as physically different devices and connected to each other via a cable or the like so as to be able to exchange signals. .

  An example of the positional relationship between the reading unit 14 and the data reading optical pickup 92 will be described with reference to FIG. FIG. 7 is a schematic diagram showing a positional relationship among the recording medium 100, the motor 90, the reading unit 14, and the data reading optical pickup 92. In this figure, an amorphous alloy member 34 is provided on the upper surface of the recording medium 100 and data is recorded on the lower surface of the recording medium. Are designed to read the lower surface respectively. The amorphous alloy member 34 may be provided on the lower surface side. In this case, the reading unit 14 is naturally provided on the lower surface.

  Returning to the description of FIG. 6, the determination unit 18 determines the authenticity (whether genuine or fake) of the amorphous alloy member in which the uneven region is formed, based on the reading result by the reading unit 14. . The control unit 82 included in the determination unit 18 controls various devices provided in the authenticity determination device 10.

  The memory 86 stores reference feature information indicating information indicating the feature of the uneven area on the reference amorphous alloy member, each program, and various data.

  The reading unit 14 includes an illuminating unit 30 that irradiates the recording medium 100 with light, and a light receiving unit 32 that receives reflected light from the recording medium 100 of the light irradiated by the illuminating unit 30. . The illumination unit 30 irradiates the recording medium 100 with light, and the reflected light is received by the light receiving unit 32, thereby reading characteristic information indicating the characteristics of the amorphous alloy member 100A of the recording medium 100.

  As shown in FIG. 8, the illuminating unit 30 has a light source 30B that outputs light, and the surface of the recording medium 100 that is in contact with the light receiving unit 32 by guiding the light output from the light source 30B toward the recording medium 100. And an optical waveguide optical system 30A for irradiating the amorphous alloy member 100A. For the light source 30B, for example, an LED, a halogen lamp, a fluorescent lamp, a xenon discharge tube, or the like can be used. Further, instead of the optical waveguide optical system 30A, a condensing lens that collects light on the surface of the recording medium 100 may be used.

  The light receiving unit 32 includes an image sensor 32B and a lens unit 32A that forms an image of reflected light from the surface of the recording medium 100 of the illumination light irradiated by the illumination unit 30 on the light receiving surface of the image sensor 32B. Yes. The characteristics of the amorphous alloy member 100A of the recording medium 100 are acquired as grayscale information indicating the surface state of the amorphous alloy member 100A.

  In the present embodiment, it is assumed that the reading resolution by the image sensor 32B is 400 dpi, and the reading gradation by the reading unit 14 is an 8-bit gray scale. The reading resolution and the reading gradation are not limited to such values.

  Next, processing executed by the control unit 82 of the recording medium reading device 94 will be described with reference to FIG. Here, in order to avoid complications, it is assumed that the reference feature information is stored in the memory 86 in advance.

  In step 1, the control unit 82 determines whether or not a recording medium is loaded. When the recording medium is loaded, the motor 90 is rotated in step 2 and in step 3 it is determined whether or not a predetermined angular velocity has been reached. . When the predetermined angular velocity is reached, a recording medium authenticity determination process is executed in step 4.

  The authenticity determination process will be described with reference to FIGS. 11 and 12 and FIG.

  First, in step 101, the unevenness of the amorphous alloy member 34 as the authenticity determination target is used as determination target feature information indicating the characteristics of the unevenness region 34A of the amorphous alloy member 34 (see FIG. 11) as the authenticity determination target. A collation area 52 (see FIG. 11B) having a predetermined size in the area 34A is read. Note that trapezoidal distortion correction may be performed on the read collation area.

  As shown in FIG. 11 (B), the verification region 52 is a region at an arbitrary position on the amorphous alloy member 34 and is smaller than the uneven region 34A, and is shown in FIG. 11 (A). This is an area having a size larger than the reference area 50.

  For example, when a region of 32 × 32 dots (about 2 mm × 2 mm) is defined as the reference region 50, a region that is larger than the reference region 50 and includes the reference region 50 is collated as shown in FIG. A region 52 (for example, 64 × 64 dots (about 4 mm × 4 mm)) 52 is read.

  As shown in FIG. 11 (B), the density information indicating the surface state in the collation area 52 in the concave / convex area 34A of the amorphous alloy member 34 that is the object of the authenticity determination is obtained as a result of the process of step 101. It is read as determination target feature information indicating the feature of the uneven region 34A of the amorphous alloy member 34 to be the target.

  Based on the determination target feature information obtained by reading the reference region 50 in the uneven region 34A in step 101, an image represented by the determination target feature information (hereinafter referred to as a collation image) is visualized (to facilitate visual inspection). An example of a collation image subjected to contrast correction is shown in FIG. FIG. 12A is a diagram illustrating an example of a reference image obtained by visualizing (contrast correction for easy viewing) an image represented by the reference feature information (hereinafter referred to as a reference image).

  In the next step 102, the data extraction position (the position of the calculation target area) in the collation area 52 is initialized.

  In the true / false determination process according to the present embodiment, as will be described in detail later, data corresponding to a region (calculation target region) having the same size as the reference region 50 is extracted from the data in the collation region 52 and stored in the memory 86. The calculation of the correlation value with the reference characteristic information is repeated while moving the position of the calculation target region. For this reason, in step 102, the data extraction position (the position of the calculation target area) in the collation area is initialized.

  In the next step 103, data of an area having the same size as the reference area 50 located at the set data extraction position (hereinafter referred to as collation data) is extracted from the determination target feature information as data of the collation area 52. .

  In the next step 104, the correlation value between the reference feature information stored in the memory 86 and the collation data extracted in step 103 is calculated by the normalized correlation method according to the following equation (1), and obtained by the calculation. The correlation value is stored in the memory 86.

Where F is the reference image (a set of reference feature information), fi is the brightness value of each pixel of the reference image, N is the total number of pixels of the reference image (and the partial area of the verification image), and G is the partial area of the verification image , G i is the brightness value of each pixel in the partial area of the collation image, f _AVE is the average value of the brightness values of the individual pixels in the reference image, and g _AVE is the brightness of each pixel in the partial area of the collation image The average value.

  In the next step 105, it is determined whether the calculation target area has scanned the entire surface of the collation area 52 or not. If the result in step 105 is negative, the process proceeds to step 106, the data extraction position is moved in the vertical or horizontal direction by one dot, and then the process returns to step 103.

  That is, the processing from step 103 to step 106 is repeated until the determination at step 105 is affirmed.

  In this way, by moving the region of the same size as the reference region 50 in the collation region 52 by one dot and performing the above calculation for each piece of collation data having the same size as the reference region 50 for each movement, When the number of dots in the image is m × n and the number of dots in the collation image is M × N, (M−m + 1) × (N−n + 1) correlation values are obtained per single collation image.

  In this embodiment, since the reference area 50 is 32 × 32 dots and the collation area 52 is 64 × 64 dots, the correlation value is calculated (64−32 + 1) × (64−32 + 1) = 1089 times, and 1089 A correlation value will be obtained.

  If the determination in step 105 is affirmed, the process proceeds to step 107, and the maximum value is extracted from a large number of correlation values obtained by performing the processing from step 102 to step 105.

  In the next step 108, the maximum normalized score extracted in step 107 is used as a feature amount representing the distribution degree of a large number of correlation values obtained by performing the processing from step 101 to step 105. Calculation is performed according to the following equation (2).

Normalized score = (maximum correlation value-average correlation value) / standard deviation of correlation value (2)
In the next step 109, it is determined whether or not the maximum correlation value obtained in step 107 is greater than or equal to a threshold value and the normalized score calculated in step 108 is greater than or equal to the threshold value.

  Here, as shown in the technique of Japanese Patent Application Laid-Open No. 2005-038389 by the present inventors, the collation region 52 including the reference region 50 of the concave and convex region 34A of the same amorphous alloy member 34 is set without any positional and orientation deviation. When read, the maximum correlation value is very high. The distribution of correlation values also shows a value that is very low compared to the maximum value in the portion other than the peak portion where the correlation value is maximum.・ The score is also very high.

  When the uneven surface 34A having a different surface shape is read, the maximum correlation value is very low, and the correlation value distribution also shows a low correlation value overall including the peak portion. The normalized score of the maximum value is also very low.

  On the other hand, when the collation region 52 including the reference region 50 of the uneven region 34A of the same amorphous alloy member 34 is read with a slightly different position and orientation, the correlation value maximum value and the correlation value maximum value are normalized. The score is the same as when the matching region 52 including the reference region 50 of the uneven region 34A of the same amorphous alloy member 34 is read without deviation in position and orientation, and the reference region 50 of the uneven region 34A having a different surface shape. This is an intermediate value between when the collation area 52 including

  There are two types of false judgment in authenticity determination: a true article is mistaken as a fake and a false article is mistaken as a genuine article (note that the probability of falsely judging a genuine article as a fake is FRR (: False Rejection Rate)). The probability of misjudging a fake as a real is called FAR (: False Acceptance Rate)).

  In the true / false determination apparatus according to the present embodiment, in order to reduce these FRR and FAR, the threshold value for the maximum correlation value and the normalized score threshold value for the maximum correlation value are used as threshold values for the true / false determination. In each case, the collation region 52 including the reference region 50 of the uneven region 34A of the same amorphous alloy member 34 is read without deviation in position and orientation, and the verification includes the reference region 50 of the uneven region 34A having a different surface shape. It is determined to be an intermediate value between when the area 52 is read.

  This threshold value may be stored in the memory 86 in advance.

  When a plurality of pieces of reference feature information are stored, the threshold value of the maximum correlation value and the threshold value of the normalized score of the maximum correlation value, which are measured in advance, are associated with each piece of reference feature information. Is stored in the memory 86, and the threshold value corresponding to the reference feature information used in the calculation in step 104 may be read when determining in step 222.

  As described above, in the process of step 109, the true / false determination is performed by comparing the maximum correlation value with the threshold value and comparing the normalized score of the maximum correlation value with the threshold value. When reading the uneven area 34A on the amorphous alloy member 34, the reading position and orientation by the reading unit 14 are slightly different from the position and orientation when reading the reference area 50. In the case where the probability of determination is high, it is possible to improve the determination accuracy of the authenticity determination as compared with the case where determination is performed using only the maximum correlation value.

  If the determination in step 109 is affirmative, in step 110, the amorphous alloy member 34 subject to authenticity determination is determined to be “genuine”, the recording medium is determined to be authentic, and the control unit 82 sends data to the data reading optical pickup 92. Allow reading.

  On the other hand, if the determination in step 109 is negative, the control unit 82 determines that the amorphous alloy member 34 that is the authenticity determination target is “fake” in step 111 and the recording medium is not authentic, and the controller 82 reads the data pickup optical pickup. 92 prohibits data reading.

  As described above, according to the recording medium reading device 94 of the present embodiment, the reference feature serving as a reference for determining authenticity for each amorphous alloy member 34 manufactured using the same mold. The information is stored in the memory 86 in advance, the uneven area 34A of the amorphous alloy member 34 that is the object of authenticity determination is read, and the determination target feature information indicating the characteristics of the uneven area 34A and the reference feature information are used. The authenticity of the amorphous alloy member 34 that is the object of authenticity determination is determined.

  For this reason, in the prior art, information indicating the characteristics of the surface of each medium is registered in advance, and at the time of authenticity determination, the characteristic information on the medium that is the target of the authenticity determination is read, and the characteristic information that matches the read result is stored in advance. In the recording medium reader 94 of the present embodiment, the same mold (casting mold) is used to determine whether or not the characteristic information exists for each medium. 20, one amorphous alloy member 34 among the plurality of amorphous alloy members 34 manufactured using the forging die 60) is used as an amorphous alloy member 34 serving as a reference for authenticity determination. Reference feature information indicating the features of the uneven region 34A of the crystalline alloy member 34 may be stored in advance.

  Thus, according to the recording medium reading device 94, one of the plurality of amorphous alloy members 34 manufactured from the same mold is used as an amorphous alloy member serving as a reference for authenticity determination. Since information indicating the features of the uneven region of the amorphous alloy member may be stored in advance as reference feature information, it is possible to suppress complication of data registration processing in authenticity determination as compared with the prior art and to manage data Simplification can be achieved.

  Accordingly, the authenticity of the recording medium can be easily determined with a simple configuration, and reading is prohibited when the recording medium is not an authentic recording medium, so that unauthorized copying can be prevented.

  Further, according to the recording medium reading device 94, authenticity determination is performed using the amorphous alloy member 34 made of an amorphous alloy. Since the amorphous alloy member 34 is made of an amorphous alloy having good transferability, the uneven region 34A on the amorphous alloy member 34 is formed in the uneven shape region 24A of the casting mold 20 or the forging metal. Since it is an area formed by faithfully transferring the concavo-convex shape area 60A of the mold 60 over the details, the amorphous alloy member 34 produced from the same casting mold 20 or the forging mold 60 is the same. It has an uneven area 34A having a shape and characteristics.

  For this reason, it is possible to suppress the occurrence of variations in the shape of the uneven region 34A of the amorphous alloy member 34 produced from the same mold due to variations in manufacturing, and therefore, it is created using the same mold. The same true / false judgment result can be obtained for each of the plurality of amorphous alloy members 34 to be judged. For this reason, the authenticity determination can be performed with high accuracy.

  Furthermore, since the amorphous alloy has high strength and high hardness, it is possible to suppress a change in the surface state of the uneven region 34A due to wear, and therefore it is possible to accurately determine authenticity.

  Therefore, it is possible to provide a recording medium reading apparatus that can easily and accurately determine authenticity. By determining the authenticity of the recording medium in this way, not only can the unauthorized copying of the recording medium be prevented, but for example, by defining the reference feature information so as to authenticate the recording medium permitted for installation by a company or the like, Software that is not permitted to be installed can be prevented from being installed. In addition, the pattern of the uneven area may be changed for each lot or version of software recorded on the recording medium.

  The above-described process is a process in the case where the reference feature information is stored in advance in the recording medium reading device 94. As another example, the authenticity determination is performed by acquiring the reference feature information from a higher-level device such as a server. Processing in the case of performing will be described with reference to FIG. It is assumed that an ID for identifying the recording medium is recorded on the recording medium used in this process.

  First, in step 201, the controller 82 determines whether or not a recording medium is loaded. When the recording medium is loaded, the motor 90 is rotated, and in step 202, it is determined whether or not a predetermined angular velocity has been reached. When the predetermined angular velocity is reached, in step 203, the ID is read from the recording medium, and the ID is transmitted to the server. In the next step 204, the reference feature information corresponding to the ID is obtained from the server and stored in the memory 86, and then the authenticity determination process described above is executed in step 205.

  According to this process, since the recording medium reader 94 does not need to store the reference feature information in advance, for example, whether the development company has a server, such as commercially available software or software that can be acquired by downloading, authenticity determination This is a suitable process.

  Next, an embodiment in which the processing shown in FIGS. 9, 10, and 13 is executed by a personal computer will be described.

  As shown in FIG. 14, a personal computer (hereinafter referred to as a computer) 54 includes a display 58 that displays various types of information and a computer main body 59. A disk device 54 for mounting the recording medium 52 is provided on the front side of the computer main body 69.

  Here, the functions of the processes shown in FIGS. 9, 10, and 13 in the authenticity determination device 10 and the recording medium reading device 94 can be realized by a program 50 that can be executed by the computer 55.

  As the program 50 that can be executed by the computer, the program (authenticity determination program, recording medium reading program) used in the authenticity determination device 10 and the recording medium reader 94 is converted into a code that can be executed by the computer 55 and used. That's fine.

  The program 50 and the data used by the program 50 can be stored in advance in the recording medium 52 that can be read by the computer 55, or may be stored in advance in an HDD 62 or ROM 61 described later in the computer 55. .

  Here, the recording medium 52 for recording the program 50 refers to a change in energy such as magnetism, light, electricity, etc. according to the description content of the program with respect to the reading device 54 provided in the hardware resource of the computer 55. The contents of the program can be transmitted to the reading device 54 in the form of a signal corresponding to the state.

  Examples of such a recording medium 52 include a magneto-optical disk 52A, an optical disk 52B, a magnetic disk 52C, and a memory 52D that can be attached to the PC main body 59. An example of the memory 52D includes an IC card and a memory card. These recording media 52 may be either a portable type or a non-portable type.

  The reader 54 includes a magneto-optical disk device 54A for reading various data stored on the magneto-optical disk 52A, an optical disk device 53B for reading various data stored on the optical disk 52B, and a magnetic disk 52C. There is a magnetic disk device 54C for reading various data stored in the disk.

  As shown in FIG. 15, the computer 55 includes a CPU (Central Processing Unit) 60, a ROM (Read Only Memory) 61, and a RAM (Random Access Memory) 63. The CPU 60, ROM 61, and RAM 63 are connected to each other through a host bus 71 composed of a CPU bus or the like so as to exchange signals. The configuration including the CPU 60, the ROM 61, and the RAM 63 has the same function as the determination unit 18 of the authenticity determination device 10 described above.

  The CPU 60 has a function similar to that of the control unit 82 of the authenticity determination apparatus 10 described above, and is a control unit that executes processing according to the program 50. The ROM 61 stores programs used by the CPU 60, calculation parameters, a program 50, and the like. The RAM 63 stores programs used in the execution of the CPU 60, parameters that change as appropriate during the execution, and the like.

  The host bus 71 is connected to an external bus 66 such as a PCI (Peripheral Component Interconnect / Interface) bus via a bridge 64 so as to be able to exchange data and signals.

  The computer 55 includes a keyboard 60, a pointing device 65 such as a mouse, a display 58, an HDD (Hard Disk Drive) 62, a reading device 54, a connection port 67, a communication unit 70, a reading unit 14, and a data output unit 56. ing.

  These keyboard 60, pointing device 65 such as a mouse, display 58, HDD 62 for storing various data, reading device 54, connection port 66, communication unit 70, reading unit 14, and data output unit 56 are an interface 68, An external bus 66, a bridge 64, and a host bus 71 are connected to the CPU 62 so as to be able to send and receive signals.

  The keyboard 60 and the pointing device 65 are input devices operated by an operator and have the same functions as the input unit 16 of the authenticity determination device 10.

  The display 58 includes a liquid crystal display device or a CRT (Cathode Ray Tube), and is a device that displays various types of information as text or image information.

  When the recording medium 52 is mounted on the reading device 54, various data such as the stored program 50 is read by the reading device 54. Under the control of the CPU 60, the reading device 54 reads the program 50 and various data stored in the attached recording medium 52. The authenticity determination program, the recording medium reading program, and the data read by the reading device 54 are stored in the RAM 63 via the interface 68, the external bus 66, the bridge 64, and the host bus 71 under the control of the CPU 60.

  The connection port 67 is a port for connecting an external connection device 69 connected to the computer 55, and has a connection portion such as USB, IEEE1394. The communication unit 70 is as described in FIG.

  Since the reading unit 14 has the same configuration as the reading unit 14 of the authenticity determination device 10, detailed description thereof is omitted. The data output unit 56 is an output device for outputting various data, and can be a printer, for example.

  In such a computer 54, when the recording medium 52 is attached to the reading device 54, the CPU 60 reads the program 50 stored in the recording medium 52 and stores it in the RAM 63. If the program 50 is stored in the HDD 62 or the ROM 61, the CPU 60 reads out the program 50 stored in the HDD 62 or the ROM 61 and stores it in the RAM 63.

  In the CPU 60, the authenticity determination program and the recording medium reading program of the program 50 stored in the RAM 63 are executed. When the program 50 is executed by the CPU 60, the processing routines shown in FIGS. 9, 10, and 13 are executed by the CPU 60, and processing is executed in the computer 54 in the same manner as the recording medium reading device 94. .

  Thus, by executing the program 50 in the computer 54, the authenticity of the amorphous alloy member 34 can be easily determined with a simple configuration.

  Hereinafter, an experiment conducted by the inventors of the present application in order to confirm the determination accuracy of authenticity determination when the present invention is applied will be described.

In addition, the measurement of centerline average roughness Ra performed by each Example and the comparative example was performed with the following method.
―Measurement of centerline average roughness―
Based on the method of JIS B 0651, the center line average when the unevenness area of the surface of the amorphous alloy member is measured at a measurement length of 12.5 mm and a cutoff value of 2.5 mm as defined in JIS-B-0601 The roughness was measured using a three-dimensional surface roughness measuring instrument (SE-30K, manufactured by Kosaka Laboratory).
(Example 1)
[Production of casting mold]
As a casting mold, a casting mold 20 having a shape shown in FIG.

Next, by performing electric discharge machining on the recess 24 of the casting mold 20,
A concave / convex region 24A having a size of 40 mm × 20 mm was formed. When the center line average roughness Ra of the uneven region 24A was measured, the center line average roughness Ra = 3.0 μm.

  FIG. 16A shows a photographed image obtained by photographing the concavo-convex shape region 24A of the produced casting mold 20 using a metal microscope at a magnification of 100 times.

  Next, in the pouring step, the second mold 26 is passed through the casting mold 20 in which the concave / convex shaped region 24 </ b> A is formed, and the concave part 24 of the casting mold 20 and the concave part of the second mold 26 are passed through. After overlapping the holes 49 so as to face each other, the casting mold 20 and the second mold 26 were clamped.

  As the second mold 26, a mold made of the same material as the casting mold 20 and processed so as to form the cavity 37 by being clamped to the casting mold 20 is used. It was.

As a material represented by the general formula (Zr, Hf) _a M5 _b M6 _c, an alloy having a composition of the general formula Zr ₅₀ Hf ₁₀ Cu ₃₀ Al ₁₀ was melted at 1100 ° C. to prepare a molten metal.

The adjusted molten metal was poured into the cavity 37 formed by the mold 20 for casting and the second mold 26, which were clamped, under a vacuum condition of 10 ⁻¹ to 10 ⁻² torr.

  After the molten metal hardened, the casting mold 20 and the second mold 26 were opened with each other while moving the plunger 39. As a result, an amorphous alloy member (40 mm × 20 mm, thickness 1 mm) composed of a molten metal hardened by cooling, that is, an amorphous (glass) alloy, and having an uneven region formed by transferring the uneven region 24A. Was made.

  FIG. 16B shows a photographed image obtained by photographing the uneven area of the produced amorphous alloy member using a metal microscope at a magnification of 100 times.

  As shown in FIGS. 16A and 16B, the uneven shape region (see FIG. 16A) formed in the casting mold 20 and the uneven region (see FIG. 16) of the produced amorphous alloy member. 16 (B)), it can be seen that the pattern shown by the uneven shape is mirror-inverted. For this reason, it can be said that the uneven | corrugated shaped area | region of the metal mold | die 20 for casting is accurately transferred on the surface of the amorphous alloy member.

  In addition, the surface roughness of the regions that were in contact with each other during the transfer of the uneven shape region of the casting mold 20 produced above and the uneven region of the amorphous alloy member produced using the casting mold 20 When Ry was measured, the result shown in FIG. 17 was obtained.

  As shown in FIG. 17, the region of the concave and convex shape of the casting mold 20 produced above and the concave and convex region of the amorphous alloy member produced using the casting mold 20 are in contact with each other. Since the surface roughness Ry has almost the same value, it can be said that the uneven shape region of the casting mold 20 is accurately transferred to the submicron order on the amorphous alloy member.

  The surface roughness Ry is a value representing the maximum height defined as the difference between the maximum value and the minimum value of the roughness curve, and is a stylus-type film thickness meter (trade name: manufactured by Kosaka Laboratory Co., Ltd.). It was measured using ET-30).

  When the volume ratio of the amorphous phase of the produced amorphous alloy member was measured by the area ratio of the X-ray diffraction profile of the crystalline phase and the amorphous phase using an X-ray diffractometer, the volume ratio was 100%. Met.

  Further, a plurality of amorphous alloy members were produced using the production method of Example 1, and 10,000 amorphous alloy members were produced.

  Arbitrary 71 pieces are selected from 10,000 pieces of the amorphous alloy members produced in Example 1, and one of the selected 71 pieces is selected as an amorphous alloy member (that is, an authenticity determination criterion) The reference feature information was selected as an amorphous alloy member for collecting reference feature information, and the reference feature information was stored in the memory 48.

Specifically, as shown in FIG. 18, 144 reference regions (32 × 32 × 1) are equally spaced on the entire surface of one amorphous alloy member for collecting reference feature information selected for collecting the reference feature information. 32 dots) (reference region 50 (50 ₁ to 50 _n ) in FIG. 18) was set. Each set reference area is read by using the authenticity determination device 10, and each feature information indicating the density of each reference area is registered in the memory 86 as reference feature information, thereby performing reference feature information registration processing. .

  Next, out of the selected 71 sheets, each of the 70 amorphous alloy members other than the one selected as the amorphous alloy member for collecting the reference characteristic information is used as an amorphous alloy to be subjected to authenticity determination. Each of these amorphous alloy members is a 64 × 64 dot region including regions corresponding to 144 reference regions on the amorphous alloy member for collecting reference feature information. Set. In this way, 144 collation areas were set.

  Further, for each of the 70 amorphous alloy members to be authenticated, the control unit 82 executes the processing (steps 101 to 109) shown in FIG. A fake test was performed.

  As this true / false judgment test, FRR (: False Rejection Rate (probability to falsely judge a real thing as false)) and FAR (: False Acceptance Rate (probability to falsely judge a real thing as real))) An experiment for confirmation was performed.

[Experiment for FRR confirmation]
The 144 pieces of reference registration information registered in the memory 86 are obtained by reading the 144 pieces of reference registration information and 144 verification areas on each of the 70 amorphous alloy members to be judged. Authenticity determination was performed based on each determination target feature information.

  For this reason, in an experiment for FRR confirmation, 144 (locations) × 70 (sheets) = 1080 (times), that is, 10800 times of true / false judgment test was performed, and how many times were falsely judged as fake Evaluated.

[Experiment for FAR confirmation]
Any one of the 144 pieces of reference registration information registered in the memory 86 is left as the reference registration information in the memory 86, and the other 143 pieces of reference registration information are deleted from the memory 86.

  As a result, the density information of one reference region of the 144 reference regions set on the amorphous alloy member (one piece) for collecting the reference feature information is stored in the memory 86 as reference feature information. It is in a registered state.

  That is, one of 144 regions on the amorphous alloy member for collecting reference feature information is set as a reference region, and 144 locations on 70 amorphous alloy members to be determined as authenticity Of these areas, 143 locations other than the area corresponding to the area set as the reference area are set as the collation areas. That is, these 143 places should not be recognized as “true”. In addition, the area | region corresponding to the area | region set as said reference | standard area | region has shown the area | region located in the same position as this reference | standard area | region at the time of amorphous alloy member production using the metal mold | die 20 for casting.

  Next, the processing for performing the authenticity determination for 143 verification regions on the 70 amorphous alloy members to be determined is selected as a reference region on the amorphous alloy member for collecting reference feature information. The region to be performed was changed sequentially (ie, 144 locations) and repeated.

  For this reason, in the experiment for FAR confirmation, 70 (sheets) x 143 (locations) x 144 (locations), that is, 14441440 times of true / false judgment tests were performed, and how many times were falsely judged as true Evaluated.

  The authenticity determination was performed under the following conditions.

-Reading resolution by the image sensor 32B 600 dpi
The gradation of reading by the reading unit 14 is an 8-bit gray scale. Reference area size: 32 dots.times.32 dots. Collation area size: 64 dots.times.64 dots. Maximum correlation value threshold: 0.3.
The threshold value of the normalized score of the maximum correlation value: 5
・ Light source 30B: White LED
Image sensor 32B: CCD
(Example 2)
In Example 1, as an amorphous alloy constituting the amorphous alloy member,
As an alloy having the composition of general formula (1) M _100-n TM _n ,
An amorphous alloy member having an uneven region formed in the same manner as in Example 1 except that the molten metal was adjusted by melting an alloy having a composition of Fe ₄₄ Ni ₂₈ Si ₄ B ₂₀ Nb ₄ at 1400 ° C. Then, the authenticity determination test was performed in the same manner as in Example 1.

  In addition, the volume fraction of the amorphous phase of the amorphous alloy member produced in Example 2 was measured by the area ratio of the X-ray diffraction profile of the crystalline phase and the amorphous phase using an X diffractometer. However, the volume ratio was 100%.

(Example 3)
In Example 1, as an amorphous alloy constituting the amorphous alloy member,
As a general formula (2) Cu _p Ti _q M1 alloy having a composition of _100-pq,
An amorphous alloy member having a concavo-convex region formed thereon was prepared in the same manner as in Example 1 except that the molten metal was adjusted by melting an alloy having a composition of Cu ₆₀ Ti ₁₀ Zr ₃₀ at 1200 ° C. A true / false judgment test was performed in the same manner as in Example 1.

  In addition, the volume fraction of the amorphous phase of the amorphous alloy member produced in Example 3 was measured by the area ratio of the X-ray diffraction profile of the crystalline phase and the amorphous phase using an X diffractometer. However, the volume ratio was 100%.

Example 4
In Example 1, as an amorphous alloy constituting the amorphous alloy member,
_Melting an alloy having a composition of Ni ₅₁ Nb ₂₀ Zr ₉ Ti ₉ Co ₈ Cu ₃ at 1300 ° C. as an alloy having a composition of general formula (3) Ni _100-stu Nb _s (Zr, Hf) _t M2 _u Except that the molten metal was adjusted in the same manner as in Example 1, an amorphous alloy member having a concavo-convex region was produced, and a true / false determination test was performed in the same manner as in Example 1.

  Note that the volume fraction of the amorphous phase of the amorphous alloy member produced in Example 4 was measured by the area ratio of the X-ray diffraction profile of the crystalline phase and the amorphous phase using an X diffractometer. However, the volume ratio was 100%.

(Example 5)
In Example 1, as an amorphous alloy constituting the amorphous alloy member,
As an alloy having the composition of general formula (4) Fe _100-xy M3 _x M4 _y ,
An amorphous alloy member having a concavo-convex region was prepared in the same manner as in Example 1 except that the molten metal was adjusted by melting an alloy having the composition of Fe ₇₀ B ₂₀ Nb ₆ Si ₄ at 1400 ° C. The authenticity determination test was performed in the same manner as in Example 1.

  In addition, the volume fraction of the amorphous phase of the amorphous alloy member produced in Example 5 was measured by the area ratio of the X-ray diffraction profile of the crystalline phase and the amorphous phase using an X diffractometer. However, the volume ratio was 100%.

(Example 6)
In Example 1, as an amorphous alloy constituting the amorphous alloy member,
Formula (5) (Fe _1-z (Co, Ni) _z ) As an alloy having a composition of _100-xy M3 _x M4 _y , an alloy having a composition of Fe ₄₄ Ni ₂₈ Si ₄ B ₂₀ Nb ₄ was carried out except that the molten metal was adjusted by melting at 1400 ° C. An amorphous alloy member having a concavo-convex region was produced in the same manner as in Example 1, and a true / false judgment test was performed in the same manner as in Example 1.

  In addition, the volume fraction of the amorphous phase of the amorphous alloy member produced in Example 6 was measured by the area ratio of the X-ray diffraction profile of the crystalline phase and the amorphous phase using an X diffractometer. However, the volume ratio was 100%.

(Example 7)
In Example 1, as an amorphous alloy constituting the amorphous alloy member,
As an alloy having a composition of general formula (7) Ti _100-ijk Cu _i M7 _j M8 _k ,
Amorphous alloy with uneven regions formed in the same manner as in Example 1 except that the molten metal was adjusted by melting an alloy having the composition of Ti ₅₀ Cu ₂₀ Zr ₄ Ni ₂₀ Si ₄ B ₂ at 1200 ° C. A member was prepared and a true / false judgment test was performed in the same manner as in Example 1.

  Note that the volume fraction of the amorphous phase of the amorphous alloy member produced in Example 7 was measured by the area ratio of the X-ray diffraction profile of the crystalline phase and the amorphous phase using an X diffractometer. However, the volume ratio was 100%.

(Example 8)
In Example 1, as an amorphous alloy constituting the amorphous alloy member,
As a general formula (8) alloy having a composition of ^{_{M 1 a M 2 b Ln c}} M 3 d M 4 e M 5 f,
An amorphous alloy member having a concavo-convex region was prepared in the same manner as in Example 1 except that the molten metal was adjusted by melting an alloy having a composition of Zr ₆₅ Pd ₁₀ Cu ₁₀ Al ₁₅ at 1200 ° C. The authenticity determination test was performed in the same manner as in Example 1.

  In addition, the volume fraction of the amorphous phase of the amorphous alloy member produced in Example 8 was measured by the area ratio of the X-ray diffraction profile of the crystalline phase and the amorphous phase using an X diffractometer. However, the volume ratio was 100%.

Example 9
In Example 1, as an amorphous alloy constituting the amorphous alloy member,
As a general formula (9) an alloy having a composition of ^{_{Al 100-ghi Ln g M 6}} h M 3 i,
An uneven region was formed in the same manner as in Example 1 except that the molten metal was adjusted by melting an alloy having a composition of Al ₂₀ La ₆₅ Cu _7.5 Ni _3.8 CO _3.7 at 700 ° C. An amorphous alloy member was produced, and a true / false judgment test was performed in the same manner as in Example 1.

  Note that the volume fraction of the amorphous phase of the amorphous alloy member produced in Example 9 was measured by the area ratio of the X-ray diffraction profile of the crystalline phase and the amorphous phase using an X diffractometer. However, the volume ratio was 100%.

(Example 10)
In Example 1, as an amorphous alloy constituting the amorphous alloy member, an alloy having a composition of the general formula (12) Mg _100-qs M ⁷ _q M ⁹ _s ,
An amorphous alloy member having a concavo-convex region formed thereon was prepared in the same manner as in Example 1 except that the molten metal was adjusted by melting an alloy having a composition of Mg ₆₅ Cu ₂₅ Y ₁₀ at 700 ° C. A true / false judgment test was performed in the same manner as in Example 1.

  In addition, the volume fraction of the amorphous phase of the amorphous alloy member produced in Example 10 was measured by the area ratio of the X-ray diffraction profile of the crystalline phase and the amorphous phase using an X diffractometer. However, the volume ratio was 100%.

(Example 11)
In Example 1, as an amorphous alloy constituting the amorphous alloy member, an alloy having a composition of the general formula (13) Mg _100-qrs M ⁷ _q M ⁸ _r M ⁹ _s ,
An amorphous alloy member having an uneven region was prepared in the same manner as in Example 1 except that the molten metal was adjusted by melting an alloy having the composition of Mg ₆₅ Y ₁₀ Cu ₂₀ Al ₅ at 700 ° C. The authenticity determination test was performed in the same manner as in Example 1.

In addition, the volume fraction of the amorphous phase of the amorphous alloy member produced in Example 11 was measured by the area ratio of the X-ray diffraction profile of the crystalline phase and the amorphous phase using an X diffractometer. However, the volume ratio was 100%.
(Example 12)
In Example 1, a square pyramid-shaped diamond needle (manufactured by Akashi Seisakusho Co., Ltd., trade name: Micro Hardness Tester MVK-EIII) is used for the concave portion 24 of the casting mold 20, and the casting mold 20 is formed with the diamond needle. By forming a plurality of indentations in the concave portion 24 of the casting mold 20 by pressing, the concave / convex area is formed in the same manner as in Example 1 except that the concave / convex shaped area is formed in the casting mold 20. An amorphous alloy member was prepared and a true / false judgment test was performed in the same manner as in Example 1.

  In addition, each mark formed in this uneven | corrugated area | region was a 50 micrometers x 50 micrometers square, and was 10 micrometers in depth. When the center line average roughness Ra of the uneven region 24A was measured, the center line average roughness Ra = 0.2 μm. About this uneven | corrugated area | region, the picked-up image image | photographed with the magnification | multiplying_factor of * 75 using the Keyence company make and brand name: Microscope was shown in FIG.

  Further, the volume fraction of the amorphous phase of the amorphous alloy member produced in Example 12 was measured by the area ratio of the X-ray diffraction profile of the crystalline phase and the amorphous phase using an X-ray diffractometer. However, the volume ratio was 100%.

(Example 13)
In Example 1, an amorphous alloy member was prepared in the same manner as in Example 1 except that the following casting mold was used, and a true / false determination test was performed in the same manner as in Example 1.

Production of Casting Mold A casting mold 20 having a shape shown in FIG. 2 (A) made of high-speed tool steel (High Speed Steel: SKH51) was prepared as a casting mold.

  Next, by performing electric discharge machining on the concave portion 24 of the casting mold 20, an uneven shape region 24A of 20 mm × 50 mm was formed. When the center line average roughness Ra of the uneven region 24A was measured, the center line average roughness Ra was 0.1 μm.

  The volume fraction of the amorphous phase of the amorphous alloy member produced in Example 13 was measured by the area ratio of the X-ray diffraction profile of the crystalline phase and the amorphous phase using an X-ray diffractometer. The volume ratio was 100%.

(Example 14)
Instead of the casting mold 20 used in Example 1, a casting mold 20 in which the recess 24 is mirror-finished (Ra = 0.01 μm) is used, and the molten metal used in Example 8 is used to make an amorphous structure. An alloy substrate was produced.

  Next, a forging die 60 made of high-speed tool steel (high-speed steel: SKH51) was prepared as a forging die. Next, by performing electric discharge machining on the forging die in the same manner as in Example 1, an uneven region was formed on the forging die.

  When the center line average roughness Ra of the uneven region 24A was measured, the center line average roughness Ra = 1.0 μm.

  The forging die was attached to a forging machine, and an amorphous alloy substrate having an uneven region was formed by plastic processing of the amorphous alloy substrate under the following forging conditions.

Forging conditions: The amorphous alloy substrate has a glass transition temperature (Tg) of 410 ° C. or higher of the amorphous alloy constituting the amorphous alloy substrate, and the crystallization temperature (Tx) of this amorphous alloy is 490 ° C. Heat to 420 ° C and 450 ° C, respectively.
-Pressure from forging die 20 to amorphous alloy substrate: 10 MPa
-Pressure application time: Within 15 minutes and 2 minutes for heating temperatures of 420 ° C and 450 ° C, respectively.

  About the produced amorphous alloy member, the authenticity determination test was done like Example 1. FIG.

Note that the volume fraction of the amorphous phase of the amorphous alloy member produced in Example 14 was measured by the area ratio of the X-ray diffraction profile of the crystalline phase and the amorphous phase using an X diffractometer. However, the volume ratio was 100%.
(Comparative Example 1)
In Example 1, the material constituting the amorphous alloy member is the same as that of Example 1, except that the molten aluminum was adjusted by melting the casting aluminum alloy ADC12 at 700 ° C. instead of the amorphous alloy. Then, an amorphous alloy member having a concavo-convex region was produced, and a true / false judgment test was performed in the same manner as in Example 1.

  Note that the threshold value of the maximum correlation value and the threshold value of the normalized score of the maximum correlation value are the same as those in the first embodiment.

  In the authenticity determination test in the experiment for FRR confirmation in Examples 1 to 14, all the evaluation results indicating “true” are displayed on the display unit 19 in 10080 authenticity determination tests. "Is not displayed. For this reason, FRR was 0%.

  On the other hand, in the case where an amorphous alloy is not used as the material constituting the amorphous alloy member (Comparative Example 1), the evaluation result display unit 19 indicating “true” during 10080 authenticity determination tests. Was displayed 8568 times, and the misjudgment display indicating “fake” was 1512 times. For this reason, FRR was 15%.

  Moreover, in the authenticity determination test in the experiment for FAR confirmation in Examples 1 to 14, all the evaluation results indicating “fake” were displayed in 14144440 authenticity determination tests. For this reason, FAR was 0%.

  On the other hand, when an amorphous alloy is not used as a material constituting the amorphous alloy member (Comparative Example 1), the display unit 19 displays an evaluation result indicating “fake” during 14144440 authenticity determination tests. Was displayed at 1138738 times, and the erroneous determination display indicating “true” was 302702 times. For this reason, FAR was 21%.

It is a schematic diagram which shows the amorphous alloy member based on embodiment of this invention. It is a schematic diagram which shows the preparation methods of the amorphous alloy member using casting technique based on embodiment of this invention. It is a schematic diagram which shows an atomic arrangement model, (a) shows the atomic arrangement model of a crystalline alloy, (b) is a schematic diagram which shows the atomic arrangement model of an amorphous alloy. It is a schematic diagram which shows the preparation methods of the amorphous alloy member using the forge technique based on embodiment of this invention. It is a figure (plan view) showing an example of the appearance of a recording medium according to the present embodiment. It is a block diagram which shows an example of schematic structure of the authenticity determination apparatus and recording-medium reader based on embodiment of this invention. It is a schematic diagram which shows the positional relationship of a recording medium, a motor, a reading part, and the optical pick-up for data reading. It is a detailed block diagram of a reading part. It is a figure which shows the process performed with the recording-medium reader based on this Embodiment. It is a figure which shows the authenticity determination process based on this Embodiment. (A) is a schematic diagram which shows the reference | standard area | region in the uneven | corrugated area | region of an amorphous alloy member based on embodiment of this invention, (B) is the collation area | region in the uneven | corrugated area | region of an amorphous alloy member It is a schematic diagram which shows. (A) is an image figure which shows an example of a reference | standard image, (B) is an image figure which shows an example of a collation image. It is a figure which shows the process performed with a recording-medium reader when acquiring reference | standard feature information from the high-order apparatus based on this Embodiment. It is a figure which shows the external appearance example of a personal computer, and the recording medium with which the program was recorded. It is a figure which shows the structural example of a personal computer. (A) is a photographed image of the uneven region of the casting mold produced in Example 1, and (B) is a photographed image of the uneven region of the amorphous alloy member produced in Example 1. It is a diagram which shows the relationship between the surface roughness Ry of the uneven | corrugated shaped area | region of the casting mold produced in Example 1, and the surface roughness Ry of the uneven | corrugated area | region of an amorphous alloy member. 2 is a photographed image showing the surface of an amorphous alloy member produced in Example 1. It is the picked-up image of the uneven | corrugated area | region of the amorphous alloy member produced in Example 12. FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Authenticity determination apparatus 14 Reading part 18 Determination part 20 Casting die 34 Amorphous alloy member 34A Uneven area 60 Forging die 82 Control part 94 Recording medium readers 100 and 102 Recording medium

Claims (11)

  The surface has an uneven region having a center line average roughness Ra of 0.1 μm or more and 1000 μm or less, and at least the uneven region includes an amorphous alloy having an amorphous phase with a volume ratio of 50% or more and 100% or less. A recording medium in which a configured amorphous alloy member is provided in a predetermined region. The shape of the recording medium is a disk shape having a rotation axis,
The plurality of predetermined areas are provided so that the center of gravity of the recording medium coincides with the rotation axis when the plurality of predetermined areas are provided on the recording medium. recoding media.   The recording medium according to claim 1, wherein a center line average roughness Ra of the uneven region is 0.1 μm or more and 100 μm or less.   The amorphous alloy includes Zr-based amorphous alloy, Hf-based amorphous alloy, Fe-based amorphous alloy, Co-based amorphous alloy, Ni-based amorphous alloy, Ti-based amorphous alloy, Cu The recording according to any one of claims 1 to 3, wherein the recording material is at least one selected from a base amorphous alloy, an Au base amorphous alloy, and a La base amorphous alloy. Medium. The said amorphous alloy has at least 1 sort (s) of composition selected from following General formula (1)-General formula (7), The any one of Claims 1-3 characterized by the above-mentioned. recoding media.
General formula (1) M _100-n TM _n
In the general formula (1), M represents one or more elements of Fe, Co, Ni, Cu, Ti, Zr, and Hf. TM always contains at least one element selected from the group consisting of Cr, Mo, Nb, Al, Sn, and B at least 1 atomic%, and the balance is 3, 4, 5, 6, 8, Transition metal elements composed of elements belonging to Groups 9, 10, and 11 (except for elements applied to Cr, Mo, Nb, and M), and elements belonging to Groups 13, 14, and 15 Represents at least one element selected from the group consisting of typical elements (excluding Al, Sn, and B). n represents atomic%, and 5 ≦ n ≦ 50.
Formula _{(2) Cu p Ti q M1} 100-pq
In the general formula (2), M1 represents at least one element selected from the group consisting of an element belonging to the iron group, an element belonging to the platinum group, an element belonging to a noble metal, Al, Sn, Zn, Hf, and Zr. . p and q represent atomic%, and 50 ≦ p ≦ 65 and 2 ≦ q ≦ 20.
General formula (3) Ni _100-stu Nb _s (Zr, Hf) _t M2 _u
In the general formula (3), M2 represents at least one element selected from the group consisting of an element belonging to the iron group, an element belonging to the platinum group, an element belonging to a noble metal, Cu, and Ti. s, t, and u each represent atomic%, and are 10 ≦ s ≦ 25, 5 ≦ t ≦ 20, 5 ≦ u ≦ 25, and 10 ≦ t + u ≦ 35.
Formula (4) Fe _100-xy M3 _x M4 _y
In the general formula (4), M3 represents at least one element selected from the group consisting of transition metal elements composed of elements belonging to Group 3, Group 4, Group 5, and Group 6. M4 is composed of any one element or two or more elements of Mn, Ru, Rh, Pd, Ga, Al, Ge, Si, B, and C. x and y each represent atomic%, and 2 ≦ x ≦ 35 and 5 ≦ y ≦ 30.
Formula (5) (Fe _1-z (Co, Ni) _z ) _100-xy M3 _x M4 _y
In the general formula (5), M3 represents at least one element selected from the group consisting of transition metal elements consisting of elements belonging to Group 3, Group 4, Group 5, and Group 6. M4 is composed of any one element or two or more elements of Mn, Ru, Rh, Pd, Ga, Al, Ge, Si, B, and C. x, y, and z each represent atomic%, and 2 ≦ x ≦ 35, 5 ≦ y ≦ 30, and 0.1 ≦ z ≦ 0.7.
Formula (6) (Zr, Hf) _a M5 _b M6 _c
In general formula (6), M5 is an element belonging to Group 3, an element belonging to Group 5, an element belonging to Group 6, an element belonging to the iron group, an element belonging to the platinum group, an element belonging to a noble metal, Cu, Ti, and It represents at least one element selected from the group consisting of Mn. M6 represents at least one element selected from the group consisting of Be, Zn, Al, Ga, B, C, and N. “a”, “b”, and “c” each represent atomic%, and 30 ≦ a ≦ 70, 15 ≦ b ≦ 65, and 1 ≦ c ≦ 30.
Formula (7) Ti _100-ijk Cu _i M7 _j M8 _k
In the general formula (7), M7 represents at least one element selected from the group consisting of Zr, Hf, an element belonging to the iron group, and a transition metal element consisting of an element belonging to the platinum group. M8 represents at least one element selected from the group consisting of an element belonging to Group 3, an element belonging to Group 5, an element belonging to Group 6, Al, Sn, Ge, Si, B, and Be. i, j, and k each represent atomic%, and 5 ≦ i ≦ 35, 10 ≦ j ≦ 35, and 1 ≦ k ≦ 20. The said amorphous alloy has at least 1 sort (s) of composition selected from following General formula (8)-General formula (13), The any one of Claims 1-3 characterized by the above-mentioned. recoding media.
Formula ^{_{(8) M 1 a M 2}} b Ln c M 3 d M 4 e M 5 f
In the general formula (8), M ¹ represents one or two elements selected from Zr and Hf, and M ² represents Ni, Cu, Fe, Co, Mn, Nb, Ti, V, Cr, Zn, Al And Ln represents Y, La, Ce, Nd, Sm, Gd, Tb, Dy, Ho, Yb and Mm (Misch metal which is an aggregate of rare earth elements). M ³ represents at least one element selected from the group consisting of Be, B, C, N and O, and M ⁴ represents Ta, W and Mo. At least one element selected from the group is represented, and M ⁵ represents at least one element selected from the group consisting of Au, Pt, Pd and Ag. a, b, c, d, e and f are atomic%, 25 ≦ a ≦ 85, 15 ≦ b ≦ 75, 0 ≦ c ≦ 30, 0 ≦ d ≦ 30, 0 ≦ e ≦ 15, 0 ≦ f ≦ 15.
Formula _{(9) Al 100-ghi Ln} g M 6 h M 3 i
In the general formula (9), Ln represents at least one element selected from the group consisting of Y, La, Ce, Nd, Sm, Gd, Tb, Dy, Ho, Yb and Mm, and M ⁶ represents Ti, V , Cr, Mn, Fe, represents Co, Ni, Cu, Zr, Nb, Mo, Hf, at least one element selected from the group consisting of Ta and W, M ³ is be, B, C, N and O Represents at least one element selected from the group consisting of g, h and i, each representing atomic%, and 30 ≦ g ≦ 90, 0 <h ≦ 55, and 0 ≦ i ≦ 10.
Formula (10) Mg _100-p M ⁷ _p
In the general formula (10), M ⁷ represents at least one element selected from the group consisting of Cu, Ni, Sn and Zn, p represents atomic%, and 5 ≦ p ≦ 60.
Formula (11) Mg _100-qr M ⁷ _q M ⁸ _r
In the general formula (11), M ⁷ represents at least one element selected from the group consisting of Cu, Ni, Sn and Zn, and M ⁸ is at least one element selected from the group consisting of Al, Si and Ca. Represents. q and r each represent atomic%, and 1 ≦ q ≦ 35 and 1 ≦ r ≦ 25.
Formula (12) Mg _100-qs M ⁷ _q M ⁹ _s
In the general formula (12), M ⁷ represents at least one element selected from the group consisting of Cu, Ni, Sn and Zn, and M ⁹ is selected from the group consisting of Y, La, Ce, Nd, Sm and Mm. Represents at least one element. q and s each represent atomic percent, and 1 ≦ q ≦ 35 and 3 ≦ s ≦ 25.
Formula (13) Mg _100-qrs M ⁷ _q M ⁸ _r M ⁹ _s
In the general formula (13), M ⁷ represents at least one element selected from the group consisting of Cu, Ni, Sn and Zn, and M ⁸ represents at least one element selected from the group consisting of Al, Si and Ca. M ⁹ represents at least one element selected from the group consisting of Y, La, Ce, Nd, Sm and Mm. q, r, and s each represent atomic%, and 1 ≦ q ≦ 35, 1 ≦ r ≦ 25, and 3 ≦ s ≦ 25. The surface has a concavo-convex region having a center line average roughness Ra of 0.1 μm or more and 1000 μm or less, and at least the concavo-convex region has an amorphous phase having a volume ratio of 50% or more and 100% or less, which is a criterion for authenticity. Storage means for preliminarily storing reference characteristic information indicating characteristics of the uneven region of an amorphous alloy member including a crystalline alloy;
The surface that has a concavo-convex region having a center line average roughness Ra of 0.1 μm or more and 1000 μm or less, and at least the concavo-convex region has an amorphous phase with a volume ratio of 50% or more and 100% or less, which is a target for authenticity determination. Reading means for reading determination target characteristic information indicating characteristics of the uneven region from a recording medium provided with an amorphous alloy member including a crystalline alloy;
When the determination target feature information is read by the reading unit, the determination target feature information is compared with the reference feature information. Based on the comparison result, the authenticity determination target amorphous alloy member is Determining means for determining whether the recording medium is an authentic recording medium by determining whether the recording medium is true;
A true / false determination device.   The authenticity determination device according to claim 7, further comprising an acquisition unit configured to acquire the reference feature information stored in the storage unit from a higher-level device. The true / false determining device according to claim 7 or 8,
Recorded information reading means for reading information recorded on the recording medium provided in the authenticity determination device;
Control means for controlling to prohibit reading by the recorded information reading means when the authenticity determining device determines that the recording medium is not an authentic recording medium;
A recording medium reading device comprising: The surface has a concavo-convex region having a center line average roughness Ra of 0.1 μm or more and 1000 μm or less, and at least the concavo-convex region has an amorphous phase having a volume ratio of 50% or more and 100% or less, which is a criterion for authenticity. A storage step of storing in advance reference feature information indicating the features of the uneven region of an amorphous alloy member comprising a crystalline alloy;
The surface that has a concavo-convex region having a center line average roughness Ra of 0.1 μm or more and 1000 μm or less, and at least the concavo-convex region has an amorphous phase with a volume ratio of 50% or more and 100% or less, which is a target for authenticity determination. A reading step of reading determination target characteristic information indicating characteristics of the uneven region from a recording medium provided with an amorphous alloy member including a crystalline alloy; and
When the determination target feature information is read by the reading step, the determination target feature information is compared with the reference feature information. Based on the comparison result, the authenticity determination target amorphous alloy member is A determination step of determining whether the recording medium is an authentic recording medium by determining whether the recording medium is true;
A true / false determination program for causing a computer to execute a process having The surface has a concavo-convex region having a center line average roughness Ra of 0.1 μm or more and 1000 μm or less, and at least the concavo-convex region has an amorphous phase having a volume ratio of 50% or more and 100% or less, which is a criterion for authenticity. A storage step of storing in advance reference feature information indicating the features of the uneven region of an amorphous alloy member comprising a crystalline alloy;
The surface that has a concavo-convex region having a center line average roughness Ra of 0.1 μm or more and 1000 μm or less, and at least the concavo-convex region has an amorphous phase with a volume ratio of 50% or more and 100% or less, which is a target for authenticity A reading step of reading determination target characteristic information indicating characteristics of the uneven region from a recording medium provided with an amorphous alloy member including a crystalline alloy; and
When the determination target feature information is read by the reading step, the determination target feature information is compared with the reference feature information. Based on the comparison result, the authenticity determination target amorphous alloy member is A determination step of determining whether the recording medium is an authentic recording medium by determining whether the recording medium is true;
A control step for controlling to prohibit reading of information recorded on the recording medium when the determining step determines that the recording medium is not a genuine recording medium;
A recording medium reading program for causing a computer to execute a process including: