JPWO2015049913A1 - Bulk body, wristwatch exterior parts or movements, jewelry, tags, or fasteners, and methods of manufacturing the same - Google Patents

Bulk body, wristwatch exterior parts or movements, jewelry, tags, or fasteners, and methods of manufacturing the same Download PDF

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JPWO2015049913A1
JPWO2015049913A1 JP2014069997A JP2015540413A JPWO2015049913A1 JP WO2015049913 A1 JPWO2015049913 A1 JP WO2015049913A1 JP 2014069997 A JP2014069997 A JP 2014069997A JP 2015540413 A JP2015540413 A JP 2015540413A JP WO2015049913 A1 JPWO2015049913 A1 JP WO2015049913A1
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Prior art keywords
lattice
character
bulk
mold
glass
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Japanese (ja)
Inventor
裕幸 原田
裕幸 原田
清水 幸春
幸春 清水
望 富樫
望 富樫
豪 高野
豪 高野
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並木精密宝石株式会社
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Priority to JP2013209466 priority
Application filed by 並木精密宝石株式会社 filed Critical 並木精密宝石株式会社
Priority to PCT/JP2014/069997 priority patent/WO2015049913A1/en
Publication of JPWO2015049913A1 publication Critical patent/JPWO2015049913A1/en
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    • GPHYSICS
    • G04HOROLOGY
    • G04DAPPARATUS OR TOOLS SPECIALLY DESIGNED FOR MAKING OR MAINTAINING CLOCKS OR WATCHES
    • G04D7/00Measuring, counting, calibrating, testing or regulating apparatus
    • GPHYSICS
    • G02OPTICS
    • G02BOPTICAL ELEMENTS, SYSTEMS, OR APPARATUS
    • G02B5/00Optical elements other than lenses
    • G02B5/18Diffraction gratings
    • G02B5/1809Diffraction gratings with pitch less than or comparable to the wavelength
    • GPHYSICS
    • G02OPTICS
    • G02BOPTICAL ELEMENTS, SYSTEMS, OR APPARATUS
    • G02B5/00Optical elements other than lenses
    • G02B5/18Diffraction gratings
    • G02B5/1847Manufacturing methods
    • G02B5/1852Manufacturing methods using mechanical means, e.g. ruling with diamond tool, moulding
    • GPHYSICS
    • G02OPTICS
    • G02BOPTICAL ELEMENTS, SYSTEMS, OR APPARATUS
    • G02B5/00Optical elements other than lenses
    • G02B5/18Diffraction gratings
    • G02B5/1861Reflection gratings characterised by their structure, e.g. step profile, contours of substrate or grooves, pitch variations, materials

Abstract

[PROBLEMS] To provide a new anti-counterfeiting effect having a further anti-counterfeiting effect by directly taking anti-counterfeiting measures on a character of a brand logo formed on a product itself or a figure such as a trademark indicating a brand or a manufacturer. Provide countermeasures and manufacturing methods. A mold in which a character or a figure is formed on a bulk body, and then the character or figure is heated, and further, any shape of a predetermined lattice, slit, protrusion, hole, or latent image is formed. Press the character or figure to transfer any of the lattice, slit, protrusion, hole, or latent image to at least a part of the character or figure, and then release the cooling and pressing to transfer the mold to the character or figure. And then, by cooling or casting the character or graphic, at least a part of the predetermined lattice, slit, protrusion, hole, or latent image is formed on at least a part of the character or graphic. . The bulk body on which the characters or figures are formed is provided in an exterior part or movement for a wristwatch, a jewelry, a tag, or a fastener. [Selection] Figure 2

Description

  The present invention relates to a bulk body in which characters or figures are formed, and a method for manufacturing the bulk body.
  Damages caused by counterfeit products are spreading for various products such as apparel, bags and watches of famous brands, hobby items such as household electronics equipment, industrial equipment, automobiles, and accessories. The damage caused by counterfeit goods to a company is large. For example, if low-cost counterfeit goods are available, not only the loss of sales opportunities for genuine products but also the failure of the business model may occur. In addition, if bad reputation spreads by bad imitation products, it may lose the trust of the brand image that has been nurtured over the years.
  In order to prevent damage caused by such counterfeit products, many technologies have been developed to distinguish between genuine products and counterfeit products. Among them, a forgery prevention label using a hologram is widely used (for example, see Patent Document 1). Hologram is a technique for recording an image that appears three-dimensionally on a plane by using interference of light. The anti-counterfeit label using this hologram is affixed to the authentic product itself, or to the authentic certificate or package of the product, thereby proving that the product is an authentic product.
  Anti-counterfeit labels using holograms are already used as counterfeit products in various fields because they can be introduced relatively easily.
JP 2003-220661 A
  Thus, although it is a forgery prevention label used as a countermeasure against counterfeit goods in various fields, recently, there is a concern about a decrease in the forgery prevention effect. Until the production of hologram decoration images and stereoscopic images became widespread, hologram production technology was a relatively advanced technology, so that the effect of preventing forgery was sufficiently maintained.
  However, with the widespread use of hologram production technology, it has become possible for manufacturers who deal with counterfeits to easily obtain a large number of fake holograms. For this reason, the demand for new forgery prevention measures to replace holograms is rapidly increasing in the market.
  The present invention has been made in view of the above circumstances, and by taking anti-counterfeiting measures directly on the characters of the brand logo formed on the product itself, and the figure called the trademark indicating the brand and manufacturer, It is an object to provide a new anti-counterfeiting measure having a further anti-counterfeit effect and a manufacturing method thereof.
  Furthermore, the present invention has a structure that is not found at first glance that the anti-counterfeiting measure is applied to the characters and figures as a focus of a new anti-counterfeiting measure. By taking anti-counterfeiting measures of such a structure, it is difficult for the manufacturer of counterfeit products to make it difficult to determine where the anti-counterfeiting measures of the genuine product are taken or what is the anti-counterfeiting measure itself. To prevent imitation of anti-counterfeiting measures themselves. Thus, an object of the present invention is to provide a new anti-counterfeiting measure and a method for manufacturing the same, which further enhances anti-counterfeiting.
  The above-mentioned subject is achieved by the following present invention. That is, the bulk body of the present invention is formed with characters or figures, and at least a part of the letters or figures is formed with one or more of lattices, slits, protrusions, holes, or latent images. It is characterized by being.
  In one embodiment of the bulk body of the present invention, a lattice is formed in at least a part of a lattice, a slit, a protrusion, a hole, or a latent image, and the lattice further includes a metallic glass including a vitreous metal single phase, Metal glass containing a vitreous metal single phase having a supercooled liquid temperature range of 30K or higher at a heating rate of 0.67 K / s, metal glass containing crystals having a particle size of 100 nm or less, or vitreous metal structure by volume ratio It is preferably made of any of metallic glass containing 50% or more, and the interval between the grooves of the lattice is preferably set within a range of less than 10 μm.
  In another embodiment of the bulk body of the present invention, it is preferable that the interval between the grooves of the lattice is set in the range of 527 nm to 1217 nm.
  In another embodiment of the bulk body of the present invention, the grating grooves have two or more different spacings, and the spacing is at least two or more different spacings of either 1020 nm, 784 nm, or 659 nm. Preferably there is.
  In another embodiment of the bulk body of the present invention, it is preferred that the grating grooves further have two or more different groove angles.
  In another embodiment of the bulk body of the present invention, the metal glass preferably contains Pt as a main component.
  In another embodiment of the bulk body of the present invention, it is preferable that at least a part of the lattice is formed in at least a part of the thickness direction of the character or figure.
  In addition, the wristwatch exterior part or movement, accessory, tag, or fastener of the present invention includes the bulk body described above.
In the bulk body manufacturing method of the present invention, a character or a figure is formed on the bulk body, the character or figure is heated after the formation of the character or figure, and a predetermined lattice, slit, protrusion, hole, or latent image is formed. Any one or two or more of a lattice, a slit, a protrusion, a hole, or a latent image is pressed on a character or a figure by pressing a mold on which any one or two or more shapes are formed. Transfer to at least a part of the figure, cool the character or figure after transfer, release the press of the mold, release the mold from the letter or figure, and further cool the letter or figure,
Alternatively, prepare a mold having at least one of a predetermined lattice, slit, protrusion, hole, or latent image and a character or figure, and melt the bulk material. The molten bulk material is poured into the mold, and at least a part of a predetermined lattice, slit, protrusion, hole, or latent image is formed on at least a part of the character or figure by casting. It is characterized by.
In one embodiment of the method for producing a bulk body of the present invention, at least a part of characters or figures is a metallic glass containing a glassy metal single phase, a supercooled liquid temperature range of 30 K or more at a heating rate of 0.67 K / s. It is formed of any one of a metal glass containing a glassy metal single phase, a metal glass containing a crystal having a particle size of 100 nm or less, or a metal glass containing a vitreous metal structure at a volume ratio of 50% or more. After the formation of the figure, prepare a mold in which a predetermined lattice, slit, protrusion, hole, or latent image of the shape of the lattice is formed, and set the interval between the grooves of the lattice within a range of less than 10 μm, Heat the metal glass, press the mold with the predetermined grid shape on the heated metal glass, transfer the grid to the metal glass, cool the metal glass after the transfer and release the mold press And mold release from metal glass Further cooling or metallic glass,
Alternatively, at least a mold having a lattice shape and a character or figure shape is prepared, a metal glass is melted as a bulk material, and the molten metal glass is poured into the mold, and the character or figure is cast by casting. It is preferable to form a lattice at least partially within a range of a groove interval of less than 10 μm.
  In another embodiment of the method for producing a bulk body of the present invention, it is preferable to set the interval between the grooves of the lattice within a range of 527 nm to 1217 nm.
  In another embodiment of the method for producing a bulk body of the present invention, it is preferable to form at least two or more different intervals of 1020 nm, 784 nm, or 659 nm as the grooves of the lattice.
  In another embodiment of the method for producing a bulk body of the present invention, it is preferable that two or more different groove angles are further formed in the grooves of the lattice.
  In another embodiment of the method for producing a bulk body of the present invention, the metal glass is preferably a metal glass containing Pt as a main component.
In another embodiment of the method for producing a bulk body of the present invention, a mold having a lattice shape is prepared, and pressing by the mold is performed on at least a part in the thickness direction of a character or a figure,
Alternatively, a mold having at least a lattice shape formed in at least part of the thickness direction of the character or figure shape is prepared, the bulk body material is melted, and the molten bulk body material is poured into the mold, It is preferable to form a lattice on at least part of the thickness direction of the characters or figures by casting.
  In addition, the method of manufacturing an exterior part or movement, accessory, tag, or fastener for a wristwatch according to the present invention is described in any one of the above, on at least a part of the exterior part or movement, accessory, tag, or fastener for a watch. A bulk body is provided.
  According to the bulk body of the present invention, the anti-counterfeiting structure is directly applied to the genuine product itself by forming the anti-counterfeiting structure directly on the characters and figures formed on the bulk body provided in the product itself. Is done. Therefore, since a product that distinguishes authenticity, such as an anti-counterfeit label, is not attached to the product separately, it is possible to judge the authenticity of the product itself. It becomes possible to give the product a high anti-counterfeit effect.
  Furthermore, by setting the interval between the grooves of the lattice within a range of less than 10 μm, it is possible to make it difficult to find a structure for preventing forgery by simply looking at a character or a graphic. Further, by providing the genuine article with a bulk body in which characters and figures are formed, it is not necessary to separately attach an object for identifying authenticity such as a conventional anti-counterfeit label. Therefore, it is possible to make it difficult to determine where the genuine product is taking anti-counterfeit measures or what is the anti-counterfeit measure itself, and the manufacturer of counterfeit products can easily take the anti-counterfeit measure itself. It can be made not to imitate. Therefore, it becomes possible to further increase the prevention of forgery of genuine products.
  Furthermore, the lattice includes a metallic glass containing a glassy metallic single phase, a metallic glass containing a vitreous metallic single phase having a supercooled liquid temperature range of 30 K or more at a heating rate of 0.67 K / s, and a crystal having a particle size of 100 nm or less. Compared with the one that imitates the structure with another material by forming it from either metallic glass containing glass or metallic glass containing 50% or more by volume of the vitreous metal structure. Therefore, it is possible to realize a structure having a highly accurate shape with excellent manufacturing and transferability of each single structure. Therefore, it is possible to immediately distinguish a difference from a counterfeit product.
  Further, by setting the interval between the grooves of the grating within the range of 527 nm to 1217 nm, when light is incident on the grating, the first-order diffracted light having at least one or more wavelengths in the visible light region is diffracted. ,reflect. By determining the presence or absence of such diffracted reflected light with the naked eye or a light-receiving element such as a photodiode, a CCD camera, or the like, it is possible to easily determine whether the structure is a character or a figure. Therefore, it is difficult for a counterfeiter to find the structure itself, and the character or figure has diffraction characteristics, so that it is possible to facilitate the work of authenticity determination by an authentic product manufacturer or the like. . Therefore, it is possible to satisfy both conflicting demands of facilitating authenticity determination and preventing forgery.
  Furthermore, by forming at least a part of the lattice in at least a part of the thickness direction of the character or figure, even if the character or figure is viewed from the plane direction, there is no lattice in the plane of the character or figure. At first glance, it is impossible to discover the lattice itself. Of course, it is not necessary to separately attach an object for distinguishing authenticity by providing the genuine product with a bulk body formed with characters and figures. Therefore, it is possible to make it more difficult to determine where the genuine product is taking anti-counterfeit measures or what is the anti-counterfeit measure itself, and prevent counterfeit prevention measures themselves from being imitated. Furthermore, it becomes possible to further improve the prevention of forgery of genuine products.
  Further, according to the method for manufacturing a bulk body according to the present invention, any one or two or more of a predetermined lattice, slit, protrusion, hole, or latent image is formed into a character or a figure by one molding. Therefore, it is possible to realize a method for manufacturing a bulk body according to the present invention, which is low in cost and excellent in mass productivity.
(A) It is a top view which shows typically an example of the character or figure which concerns on this embodiment formed in the bulk body. (B) It is an enlarged view in circle A of Drawing 1 (a). (A) It is a perspective view of the character shown in FIG. (B) It is an expanded sectional side view when the character shown to Fig.2 (a) is seen from a BB cutting line direction. (A) It is an expanded sectional side view which shows the example of a change of the groove shape of a grating | lattice formed in the character or figure of the bulk body concerning this embodiment. (B) It is an expanded sectional side view which shows another example of a change of the groove shape of a grating | lattice formed in the character or figure of the bulk body which concerns on this embodiment. It is a top view which shows typically an example of the character or figure formed in the bulk body which concerns on this embodiment in which the grating | lattice which has a groove | channel of two or more different space | intervals was formed. (A) It is a top view which shows typically an example of the character or figure formed in the bulk body which concerns on this embodiment in which the grating | lattice which has two or more different groove | channel angles was formed. (B) It is an enlarged view in circle C of Drawing 5 (a). (C) It is an enlarged view in circle D of Drawing 5 (a). (A) It is a perspective view which shows typically an example of the character or figure formed in the bulk body which concerns on this embodiment by which the grating | lattice was formed in the bottom part of the thickness direction. (B) It is the perspective view which showed only the lattice part shown to Fig.6 (a) by the continuous line. It is explanatory drawing which shows typically the structure of the transfer apparatus which concerns on this embodiment. It is explanatory drawing which shows typically the transfer process in the transfer apparatus which concerns on this embodiment. It is explanatory drawing which shows typically the mold release process in the transfer apparatus which concerns on this embodiment.
  Hereinafter, with reference to FIGS. 1-6, the character or figure formed in the bulk body which concerns on this invention is demonstrated in detail. In the present invention, characters or figures are formed on the bulk body, and the characters or figures are also formed from the bulk body. One or more of a lattice, a slit, a protrusion, a hole, or a latent image is formed as at least a part of the character or figure as a structure for preventing forgery. FIG. 1 shows an alphabet I as an example of anti-counterfeiting measures, in which a lattice is formed in a plane direction on a plane portion that is a part of a character or figure formed in a bulk body. Yes. The XYZ orthogonal coordinate systems shown in FIGS. 1 to 6 correspond to each other in each figure. In addition, in FIGS. 1 to 6, the bulk body of the base of characters or figures is not shown.
  The size of the character or figure 1 is set such that, for example, the size H in the height direction is set to 1 mm or more and can be discriminated visually. The upper limit of the size H can be set arbitrarily and may be set to about 5 mm. Moreover, the thickness T in the Z-axis direction of the character or figure can be arbitrarily set, and may be set to be less than about 5 mm.
  In addition to the alphabet as shown in FIG. 1, the characters or graphics include all characters such as hiragana, katakana, kanji, numbers, kanji numerals, symbols, codes, and brand logos. In addition, the figure includes a basic figure such as a circle, a triangle, or a rectangle, a more complicated geometric pattern, or a trademark indicating a brand or a manufacturer.
  As shown in FIGS. 1 and 2, the lattice mentioned as an example of the structure for preventing forgery has a shape only in one axis direction (Y-axis direction in FIGS. 1 and 2) in the X-axis-Y-axis plane. It shall refer to the structure which consists of unevenness | corrugation mutually parallel which changes periodically at equal intervals. The cross-sectional shape of the projections and depressions can be appropriately formed, and not only the waveform as shown in FIG. 2 (b) but also the V-shaped triangular wave shape shown in FIG. 3 (a) or the rectangular shape shown in FIG. It may be molded.
  A latent image is an image that can be identified by arranging characters or figures obliquely with respect to the line of sight, and is processed by latent image processing. Furthermore, latent image processing is defined as image processing that can be discriminated when a character or a figure is arranged obliquely with respect to the line of sight.
  Such characters and figures are formed by pressing or engraving or the like on a watch body exterior part or a bulk body part of a product itself such as a movement, an accessory, a tag, or a fastener. By forming the anti-counterfeiting structure directly on the characters and figures formed in the bulk body provided in the product itself, the anti-counterfeiting measure is directly applied to the genuine product itself. Therefore, since a product that distinguishes authenticity, such as the anti-counterfeit label, is not attached to the product separately, it is possible to determine the authenticity of the product itself. It is possible to give the product a high anti-counterfeiting effect.
  The size of each single structure of the structure for preventing forgery is preferably less than 10 μm. In the present invention, the limit that the human eye can recognize as a structure is defined as less than 10 μm. Therefore, when the size of the single structure is 10 μm or more, the human eye can recognize the structure as a structure in the present invention.
  In the case of a lattice, each single structure of each anti-counterfeiting structure is a pair of irregularities. The depth of each unevenness and the distance d between the tops or grooves are set within a range of less than 10 μm. In FIG. 1, in order to give priority to ease of understanding, the top and bottom of each of the corrugated irregularities are indicated by solid lines. Furthermore, in FIG.1 and FIG.2, the space | interval d of a top part or a groove | channel is expanded and shown in order to ensure visibility.
  In the case of a slit, each cut is set as a single structure, and the size of each cut and the interval between the cuts are set within a range of less than 10 μm. In the case of protrusions, each protrusion has a single structure, and the size of each protrusion and the interval between the protrusions are set within a range of less than 10 μm. In the case of holes, each hole has a single structure, and the diameter of each hole and the interval between holes are set within a range of less than 10 μm. In the case of a latent image, each latent image has a single structure, and the size of each latent image and the interval between the latent images are set within a range of less than 10 μm.
  Thus, by setting the size of the single structure to be less than 10 μm, it is possible to make it difficult to find a structure for preventing counterfeiting at first glance. Furthermore, by providing the genuine product with the bulk body in which characters and figures are formed according to the present invention, it is not necessary to separately attach an object for identifying authenticity such as a conventional anti-counterfeit label. Therefore, it is possible to make it difficult to determine where the genuine product is taking anti-counterfeit measures or what is the anti-counterfeit measure itself, and the manufacturer of counterfeit products can easily take the anti-counterfeit measure itself. It can be made not to imitate. Therefore, it becomes possible to further increase the prevention of forgery of genuine products.
  Of the anti-counterfeiting structure, only the lattice is a structure whose shape periodically changes at equal intervals only in one axial direction, and extends in the other axial direction (X-axis direction in FIGS. 1 and 2). There is no structural change. Therefore, unlike other structures, there is no need to periodically change the structure in the biaxial direction (X-axis and Y-axis directions), and it is also necessary to perform punching processing such as slits and holes. Since there is no lattice, the structure can be more concise than other structures. Therefore, the lattice is the easiest to manufacture and is the most preferred structure for forming a single structure of less than 10 μm.
  In addition, since the depth and interval d of each unevenness are set within a range of less than 10 μm, the counterfeiting of the grating itself can be made difficult, and the counterfeiting of the genuine product can be prevented in terms of the difficulty of counterfeiting. It becomes possible to raise. The depth h of each groove may be set to several hundred nm to several μm.
  The anti-counterfeiting structure formed on the character or figure 1, the bulk body on which the character or figure is formed, and the character or figure are formed from metal glass. Alternatively, at least the structure for preventing forgery may be formed of metal glass. The metallic glass according to the present invention includes a metallic glass including a vitreous metallic single phase, a metallic glass including a vitreous metallic single phase having a supercooled liquid temperature range of 30 K or more at a heating rate of 0.67 K / s, and a grain of 100 nm or less. It is selected from any one of metallic glasses containing crystals having a diameter or metallic glasses containing a glassy metallic structure containing 50% or more by volume.
  A metallic glass including a glassy metallic single phase or a crystal having a particle size of 100 nm or less has a texture structure exhibiting surface smoothness. Accordingly, since there is no particle defect, a structure with a smooth surface can be produced. Furthermore, manufacturing variations can be more reliably removed. Therefore, compared to a structure that is imitated and manufactured using a different material, it is possible to realize a highly accurate structure with less manufacturing variation and superior transferability of the grating surface and transferability of each single structure of the grating. Therefore, it becomes possible to immediately distinguish the difference from the counterfeit product.
  When the crystal grain size exceeds 100 nm, the surface roughness (surface smoothness) of the structure is adversely affected, making it difficult to obtain the aforementioned effects. Therefore, it is desirable that the grain size of the crystals mixed in the matrix of the metallic glass structure is 100 nm or less.
  In addition, a metal glass including a vitreous metal single phase having a supercooling temperature region of 30 K or higher at a heating rate of 0.67 K / s has high stability as a solid glass. Therefore, by using low-cost and highly reproducible molding processes such as injection molding by extrusion, extrusion molding, pressure rolling molding, transfer, etc., each single structure of the structure can be made very easily and with high accuracy. It can be produced. Furthermore, manufacturing variations can be more reliably removed. Therefore, even if the structure is manufactured by imitation using a different material, it is possible to immediately distinguish the difference from the counterfeit product by comparing the accuracy and manufacturing variation of each single structure.
  Moreover, high dimensional accuracy and high durability can be obtained by manufacturing a structure using a metallic glass containing a glassy metallic structure by 50% or more by volume. Therefore, each single structure of the structure can be manufactured with high precision, and high durability can be imparted to the structure directly formed on the intrinsic product. Therefore, even if the structure is manufactured by imitation using a different material, it is possible to distinguish the difference from the counterfeit product by comparing the accuracy, manufacturing variation, and durability of each single structure.
  If the volume ratio of the vitreous metal structure is less than 50%, sufficient smoothness of the surface of the structure cannot be obtained. Therefore, the volume ratio of the vitreous metal structure in the metal glass is preferably 50% or more.
  In the case where the structure is a lattice, it is more desirable to set the distance d within a range of 527 nm to 1217 nm. By setting the distance d within the range of 527 nm to 1217 nm, the wavelength of the first-order diffracted light diffracted from the grating can be set to 360 nm or more and 830 nm or less. In the present invention, the wavelength of light between 360 nm and 830 nm is defined as the wavelength of the human visible light region.
  By setting the distance d within the range of 527 nm to 1217 nm, when light is incident on the grating, the first-order diffracted light having at least one or more wavelengths in the visible light region is diffracted and reflected. By determining the presence or absence of such diffracted reflected light with the naked eye or a light-receiving element such as a photodiode, a CCD camera, or the like, it is possible to easily determine whether the structure is a character or a figure. Therefore, as described above, it is difficult for a counterfeiter to find the structure itself, and the character or figure has diffraction characteristics, so that the authenticity manufacturer's work of authenticity determination can be facilitated. Is possible. Therefore, it is possible to satisfy both conflicting demands of facilitating authenticity determination and preventing forgery.
In addition, the formula showing the diffraction conditions of a grating | lattice is defined like the following formula | equation 1.

d is the interval d. m represents the order of the diffracted light, and m is 1 for the first-order diffracted light. Θ is the diffraction angle of the diffracted light with respect to the light incident on the grating, and is fixed at 43 ° in the present invention. Further, λ is the wavelength of diffracted light diffracted from the grating.
  Also, as shown in FIG. 4, for example, the letter or figure 2 is set to the alphabet T, etc., and each groove (grating) is formed so as to have two or more different intervals d1 and d2, and the interval d1 or d2 is set to At least two or more different intervals of 1020 nm, 784 nm, or 659 nm may be set. By setting the distance d1 or d2 to such a value, the wavelength λ of the first-order diffracted light is 696 nm when the distance d1 or d2 is 1020 nm, the wavelength λ is 535 nm when it is 784 nm, and the wavelength λ when it is 659 nm. Becomes 449 nm. Therefore, it becomes possible to clearly diffract light of two or more colors having any one of the three primary colors of red, green, and blue (RGB), and the work of authenticity determination can be further facilitated.
  Also, as shown in FIG. 5, the character or graphic 3 may be formed so that the lattice interval d of the character or graphic 3 is fixed to a constant value and the lattice has two or more different groove angles θ1 and θ2. good. In FIG. 5 (a), the lattice is divided into two locations, FIG. 5 (b) shows a location where the groove angle θ1 is 30 °, and FIG. 5 (c) shows a location where the groove angle θ2 is 45 °. FIG. 2B is an enlarged view in a circle C in FIG. 1A, and FIG. 2C is an enlarged view in a circle D in FIG. 1A. The groove angles θ1 and θ2 are angles with respect to the X-axis direction, respectively. In this way, by forming the lattice so as to have two or more different groove angles, imitation of counterfeiting measures itself can be made more difficult, so it is possible to further increase the prevention of forgery of genuine products. It becomes. Note that the interval d between the respective gratings formed at the groove angle θ1 or θ2 may be set to be different from each other.
Further, the metal glass preferably contains Pt as a main component. This is because the manufacture of characters and figures is easy and the transferability is excellent, so that a single structure of less than 10 μm can be realized by transfer. The reason for its ease of production and high transferability is that it has Pt as the main component, has a supercooled liquid temperature range of 30K or higher at a temperature increase rate of 0.67 K / s, and is inelastic with respect to the compression direction. This is because the region appears and exhibits a plastic elongation of at least 0.5% from the start point of the inelastic region to the fracture, and the yield stress (or proof stress) is at least 1000 MPa. Examples of the composition (at%) of the Pt-based metallic glass include Pt 48.75, Pd 9.75, Cu 19.5, and P 22 (Pt 48.75 Pd 9.75 Cu 19.5 P 22 alloy).
  The characters or graphics formed on the bulk body according to the present embodiment can be variously changed, and FIGS. 1 to 5 show the characters or graphics 1 to 3 in which a lattice is formed in the plane direction. However, as shown in FIG. 6, at least a part of the lattice 5 may be formed in at least a part of the thickness direction (Z-axis direction) of the character or figure 4. FIG. 6 shows an example in which a corrugated lattice 5 is formed at the bottom of a character or figure 4 in the thickness direction. 6A schematically shows an alphabet T-shaped character or figure 4 in which a lattice 5 is formed at the bottom in the thickness direction, and FIG. 6B shows ensuring the visibility of the lattice 5. From the point, only the lattice 5 shown in FIG. 6A is indicated by a solid line, and portions other than the lattice 5 are indicated by a broken line. The height t of the grating 5 in the thickness direction (Z-axis direction) may be set to 30 μm or less. Further, the interval d of the grating 5 is set within a range of less than 10 μm.
  Thus, by forming the lattice 5 in the thickness direction of the character or figure 4, even if the character or figure 4 is viewed from the plane direction, there is no lattice in the plane of the character or figure 4, so that it can be seen at a glance. It is impossible to find the lattice 5 itself by itself. Of course, it is not necessary to separately attach an object for recognizing authenticity by providing the genuine product with a bulk body in which characters and figures 4 are formed. Therefore, it is possible to make it more difficult to determine where the genuine product is taking anti-counterfeit measures or what is the anti-counterfeit measure itself, and prevent counterfeit prevention measures themselves from being imitated. Furthermore, it becomes possible to further improve the prevention of forgery of genuine products.
  Further, when light is incident on the grating 5, first-order diffracted light having at least one or a plurality of wavelengths in the visible light region is diffracted from the grating 5 and reflected from the side surface of the character or graphic 4. By determining the presence or absence of such diffracted and reflected light with the naked eye or a light receiving element such as a photodiode, a CCD camera, or the like, it is possible to easily determine whether the structure is a character or a figure. Therefore, it is impossible for the counterfeiter to discover the structure itself, and the character or figure has diffraction characteristics, so that it is possible to facilitate the work of authenticity determination by an authentic product manufacturer. Become. Therefore, it is possible to satisfy both conflicting demands of facilitating authenticity determination and preventing forgery.
  In addition, the formation location of the grating | lattice 5 is not limited to a bottom part, It can form in what location of the thickness of the character or the figure 4. FIG. In FIG. 6, the lattice 5 is formed only on the bottom of a part of the side surface of the character or graphic 4. However, the lattice may be formed over the entire circumference of the bottom.
  These letters or figures 1 to 4 can be used for wristwatch exterior parts (including dials and watch band buckles) or movement parts, or accessories (rings, necklaces, earrings, bracelets, etc.), tags It is formed by pressing or engraving on the bulk body of the fastener. By providing a bulk product with a structure for preventing counterfeiting in the genuine product itself, it is possible to determine the authenticity of the product itself, preventing forgery caused by the replacement of the anti-counterfeit label, and preventing forgery with high reliability. It is possible to give effects to the product itself.
  Next, with reference to FIGS. 7-9, the manufacturing method of the bulk body based on this invention is demonstrated in detail. Note that descriptions overlapping with the above description are omitted or simplified. First, in carrying out the manufacturing method of the present invention, a character or a figure is used as a pressed material, and the pressed material is any one or more of a predetermined lattice, slit, protrusion, hole, or latent image. A transfer mold for transferring the shape and a transfer device for performing the transfer are required.
  The transfer mold is a mold in which one or more shapes of a predetermined lattice, slit, protrusion, hole, or latent image are formed. As described above, the grating is the most preferable among the grating, the slit, the protrusion, the hole, or the latent image.
  In the mold, the inverted shape of the structure to be obtained is formed. As described above, the grating has a corrugated uneven shape as shown in FIG. 2, a V-shaped triangular wave shape (FIG. 3A), or a rectangular uneven shape (FIG. 3B) with a constant interval d, Alternatively, a large number are formed at two or more different intervals d1 and d2. Therefore, the mold also needs to have a corresponding uneven shape. As an example, FIG. 7 shows a transfer device 6 including a transfer mold 9 having a concavo-convex shape corresponding to the waveform of FIG.
  When the grating formed on the character or figure has diffraction characteristics, the uneven shape of the mold 9 is designed and produced based on the diffraction conditions such as the wavelength and diffraction angle of the first-order diffracted light to be obtained.
  The mold 9 is made of silicon or the like, and the uneven shape is formed by 110-plane anisotropic etching of silicon. The concavo-convex shape formed by the 110-plane anisotropic etching of silicon has a very advantageous feature for the manufacture of a grating, that is, its accuracy is high and its surface becomes a mirror surface.
  Characters or figures 7 are formed on the bulk body to form a pressed material. Furthermore, the metallic glass as described above is used as a bulk material on which characters or figures are formed. Therefore, it is preferable that the character or figure 7 is made of metallic glass, and at least a portion where a lattice is formed is made of metallic glass.
  The transfer device 6 is a device capable of hot pressing and cooling after pressing, and has an upper die 8 and a lower die 10. A mold 9 is attached to the upper mold 8, a character or figure 7 as a pressed material is placed on the lower mold 10, the upper and lower molds 8 and 10 are pressed, and the transfer surface shape of the mold 9 (predetermined) Or any one of two or more shapes of a lattice, a slit, a protrusion, a hole, or a latent image) is transferred to a character or graphic 7.
  Next, the manufacturing method of a bulk body is demonstrated in detail along FIGS. 7-9. First, as shown in FIG. 7, the mold 9 is attached to the upper mold 8 so that the transfer surface of the mold 9 faces the lower mold 10, and the character or figure 7 as a pressed material is placed on the lower mold 10. When the character or figure 7 is taken out from the transfer device 6 after the transfer is completed, it is pressed in advance before processing the structure so that the size H and thickness T of the character or figure are the desired size. It is preferable to adjust by processing or engraving.
  When transferring a lattice to a character or a figure, it is preferable that the interval d of the lattice formed on the transfer surface of the mold 9 is set within a range of less than 10 μm as described above. When transferring other structures, the size of the single structure in the shape of the transfer surface of the mold formed in each structure is preferably set to be less than 10 μm.
  Next, the character or figure 7 and the mold 9 are heated. When at least a part of the character or figure 7 is formed of metal glass, the part of the character or figure 7 formed of at least metal glass is heated. The heating temperature of the character or figure 7 is set to a temperature not lower than the glass transition temperature of the metallic glass and not higher than the crystallization temperature (heating step).
  The biggest factor that impairs the properties of metallic glass having an amorphous phase as a main phase is crystallization of a phase regarded as amorphous. As crystallization starts, heat is generated due to the transition from the amorphous phase (metastable phase) to the crystalline phase (stable phase). At this time, the driving speed of crystallization is extremely fast, and the amorphous state is instantaneously generated. The phase considered quality disappears. Therefore, it is necessary to set the heating temperature of the character or figure 7 to be equal to or lower than the crystallization temperature of the metal glass.
Metallic glass is an amorphous alloy that has a stable supercooled liquid temperature range and exhibits a complete Newtonian viscous flow in this supercooled liquid temperature range. The supercooled liquid temperature range is a difference ΔTx (= Tx−Tg) between the crystallization temperature Tx and the glass transition temperature Tg. Metallic glass is capable of viscous flow processing at low stress in the supercooled liquid temperature range, and has excellent fine forming characteristics (fine shape transferability). Therefore, a fine structure can be produced with high accuracy by transfer molding in which the metallic glass is pressed against the mold in the supercooled liquid temperature range. The glass transition temperature differs depending on the type of metal glass. For example, a Pt-based Pt 48.75 Pd 9.75 Cu 19.5 P 22 alloy has a glass transition temperature Tg = 502.3K, a crystallization temperature Tx = 587.7K, and a supercooled liquid temperature range ΔTx = 85.4K.
  In addition, the heating method of the character or figure 7 and the metal mold | die 9 is not specifically limited, For example, the upper and lower mold | types 8 and 10 can be heated with an infrared heater etc. In the case of a metal glass that easily oxidizes, it is preferably heated in an inert gas atmosphere such as nitrogen, argon, or helium, or in a vacuum.
  Next, as shown in FIG. 8, the upper die 8 is lowered while maintaining the heating temperature of the character or figure 7 and the die 9. When the upper mold 8 has been lowered (position where the entire transfer surface shape of the mold 9 is pressed onto the surface of the character or figure 7 or the metal glass and transferred), a predetermined load is applied for a predetermined time. Hold (transfer process). For this weight and time, for example, a weight of 30 to 60 MP is added for about 1 to 3 minutes. In this way, any one or more structures of a lattice, a slit, a protrusion, a hole, or a latent image are transferred to at least a part of a character or graphic.
  Subsequently, the character or figure 7 and the mold 9 are cooled, and the pressing of the mold 9 is released. The upper die 8 is pulled up and pulled away from the lower die 10 when the temperature at which the shape to which the character or figure 7 is transferred can be maintained at a temperature lower than the glass transition temperature of the metal glass used for the character or figure. (Release process). In this way, the biting of the metallic glass on the mold 9 due to the heat shrinkage during cooling can be minimized. The upper mold 8 is preferably pulled up until the mold 9 is completely separated from the character or graphic 7. The cooling method is not particularly limited, and for example, the upper and lower molds 8 and 10 may be cooled with nitrogen gas or the like.
  Further, the character or graphic 7 is continuously cooled to room temperature (cooling process), and finally the upper mold 8 is completely lifted to take out the character or graphic 7 from the lower mold 10 of the transfer device 6.
  As described above, according to the manufacturing method of the present embodiment, any one or two or more of a predetermined lattice, slit, protrusion, hole, or latent image is formed by one transfer molding. Or since it can form in a figure, it becomes possible to implement | achieve the manufacturing method of the bulk body which concerns on this invention excellent in mass productivity at low cost.
  Furthermore, since the structure can be formed into characters or figures with good reproducibility by transfer, the structure can be manufactured with high quality. Therefore, even if the structure is manufactured by imitation using a different material, it is possible to immediately distinguish the difference from the counterfeit product by comparing the quality (manufacturing variation and accuracy) of the structure surface.
  In the above-described embodiment, the mold 9 is formed by silicon 110-plane anisotropic etching. However, the shape of the transfer surface of the mold 9 may be formed by cutting using a stainless steel diamond cutter, ion etching of quartz glass, ion milling, or focused ion beam processing.
  In the above-described embodiment, a manufacturing method in which any one or two or more of a predetermined grating, slit, protrusion, hole, or latent image is formed by transfer has been described as an example. However, any one or more of the predetermined structures may be formed by die casting or injection molding as a casting method. When a structure is formed by die casting or injection molding, first, the shape of one or more of the predetermined lattice, slit, protrusion, hole, or latent image described above, and the shape of a character or figure At least a formed mold is prepared. Further, any of the metallic glasses is melted as a bulk material, and the molten metallic glass is poured into a mold and cooled. In this way, any one or more of a predetermined lattice, slit, protrusion, hole, or latent image is formed on at least a part of the character or figure. In the present invention, the injection molding is regarded as a kind of casting, and the injection molding is defined as including a manufacturing method using molten metal glass.
  Also in die casting or injection molding, it is preferable that the interval d between the lattices formed in the mold is set within a range of less than 10 μm as described above. In the case of forming other structures, the size of the single structure in the shape of the mold formed in the shape of each structure is preferably set to less than 10 μm.
  Further, the temperature of the molten metal glass is set to the melting point or higher. In addition, the melting method of metallic glass is not specifically limited. On the other hand, the temperature of the molten metal glass is set to the melting point or higher even in the injection molding.
  As described above, according to die casting or injection molding, any one or two or more of predetermined grids, slits, protrusions, holes, or latent images can be formed together with characters or figures in a single molding. Therefore, it is possible to realize a method for manufacturing a bulk body according to the present invention which is low in cost and excellent in mass productivity.
  Furthermore, since the structure can be formed into characters or figures with high reproducibility by casting, the structure can be manufactured with high quality. Therefore, even if the structure is manufactured by imitation using a different material, it is possible to immediately distinguish the difference from the counterfeit product by comparing the quality (manufacturing variation and accuracy) of the structure surface.
  In order to suppress volume shrinkage from the time of melting of the metallic glass, it is preferable to cool and solidify at a cooling rate of 300 ° C./second or more during molding. A more preferable cooling rate is 104 ° C./second or more. However, if the cooling rate at the time of molding exceeds 107 ° C./second, the molten metal glass starts to solidify before it is sufficiently filled in the mold, so that filling failure tends to occur. As a result, the surface roughness and dimensional accuracy are significantly reduced. For this reason, the cooling rate during molding is preferably set to 300 ° C./second or more (more preferably 104 ° C./second or more) and 107 ° C./second or less.
  As another manufacturing method, after forming a character or a figure, a femtosecond laser is scanned and irradiated on at least a part of the character or the figure to ablate a part of the bulk body that forms the character or the figure. Any one or more of the structures may be formed. When the predetermined grating is formed of metal glass, the grating may be formed by setting the distance d within a range of less than 10 μm with a femtosecond laser.
  The femtosecond laser used in the present invention needs to have a laser intensity equal to or higher than the processing threshold of metal glass. Specifically, a pulse width of 150 fs to 1 ps, a repetition frequency of 1 kHz to 300 kHz, a wavelength of 780 nm to 800 nm, and an average output of around 1 W can be used.
Furthermore, a pulse laser having a pulse width of 1 ps or less is preferable. This is because a laser with a short pulse width has a laser intensity of 10 TW / cm 2 or more, and it is easier to cause ablation of a bulk body that forms characters or figures.
  In addition, as shown in FIG. 6, when forming at least a part of the lattice in at least a part in the thickness direction of the character or figure, prepare a mold having a thickness t in which the uneven shape of the lattice 5 is formed, The grating 5 may be formed by pressing the mold against a side surface that is at least part of the thickness direction of the character or figure.
  Alternatively, a bulk body is prepared in which a mold having a lattice shape formed in at least part of the thickness direction of a character or figure shape is melted, and the metallic glass that is a bulk body material is melted and melted in the mold The lattice 5 may be formed in at least part of the thickness direction of the characters or figures by pouring material and casting.
  Or you may form the grating | lattice 5 by irradiating the said femtosecond laser to the desired side surface position of a character or a figure. In any of the forming methods, the lattice 5 can be easily manufactured at low cost and with high mass productivity.
  Further, by setting the gap d of the grating grooves within the range of 527 nm to 1217 nm, the characters or figures formed on the bulk body according to the present invention are manufactured by transfer, casting, or femtosecond laser irradiation. Also good. By producing characters or figures in this way, it is possible to produce characters or figures that satisfy both conflicting requirements of facilitating authenticity determination and prevention of counterfeiting at low cost and with high productivity.
  Further, a lattice having at least two or more grooves d of 1020 nm, 784 nm, or 659 nm may be formed into characters or figures by transfer, casting, or femtosecond laser irradiation. By manufacturing letters or graphics in this way, it is possible to diffract light of two or more colors having one of the three primary colors of red, green, and blue (RGB) more clearly, making the task of authenticity determination easier. Thus, it becomes possible to manufacture a character or a figure that becomes a low-cost product with high productivity.
  Alternatively, the lattice may be transferred to a character or a figure by two or more different groove angles θ1 and θ2, cast, or irradiated with a femtosecond laser. By manufacturing characters or graphics in this way, it is possible to manufacture characters or graphics with further improved anti-counterfeiting of genuine products at low cost and with high mass productivity.
  Alternatively, the metal glass may be formed by transferring, casting, or irradiating a femtosecond laser to a character or a figure as a metal glass mainly containing Pt. By manufacturing characters or figures in this way, it is possible to manufacture characters and figures more easily at low cost and with high mass productivity.
  Examples of the present invention will be described below, but the present invention is not limited to the following examples.
  The bulk body and letters or figures according to this example were formed of metal glass and formed into an alphabetic I shape when viewed from the X-axis-Y-axis plane direction. The size H in the height direction of the alphabet was set to 2 mm, and the thickness T in the Z-axis direction was set to 1 mm.
The metallic glass was a Pt-based metallic glass, and the composition (at%) was Pt 48.75, Pd 9.75, Cu 19.5, P 22 (Pt 48.75 Pd 9.75 Cu 19.5 P 22 alloy).
  As a structure for preventing counterfeiting, a corrugated lattice as shown in FIG. 2B was formed. As shown in FIG. 1, the lattice was formed in the plane portion over the surface direction. The depth h of each groove of the lattice was 270 nm, and the lattice was directly formed in the alphabet so as to be parallel to the X axis as shown in FIG.
  As samples, three samples were prepared in which the tops of the irregularities of the lattice or the spacing d between the grooves were set to 1020 nm, 784 nm, and 659 nm, respectively. Each lattice was produced using the same transfer device. The mold was made of silicon, and the concavo-convex shape of the transfer surface was formed by 110-plane anisotropic etching of silicon.
  When the three prepared samples were observed with an atomic force microscope (AFM) from the X-axis to Y-axis plane directions, the top-to-top intervals were 1020 nm, 784 nm, and 659 nm, respectively. confirmed.
  Furthermore, when three samples were irradiated with light from the X-axis to Y-axis plane direction and the presence or absence of the first-order diffracted light (m = 1) from the grating was observed with a CCD camera, RGB with wavelengths λ of 696 nm, 535 nm, and 449 nm Light was observed.
1, 2, 3, 4, 7 Characters or graphics 5 Lattice 6 Transfer device 8 Upper mold of transfer device 9 Mold
10 Lower mold of transfer device d, d1, d2 Top or groove spacing h Groove depth H Size of character or figure in height direction T Character or figure thickness t Grid height

Claims (16)

  1.   A bulk characterized in that a character or graphic is formed, and at least a part of the lattice, slit, protrusion, hole, or latent image is formed on at least a part of the character or graphic. body.
  2. Of the grating, slit, protrusion, hole, or latent image, the grating is formed at least in part,
    Further, the lattice has a metallic glass containing a vitreous metallic single phase, a metallic glass containing a vitreous metallic single phase having a supercooled liquid temperature range of 30 K or more at a heating rate of 0.67 K / s, and a particle size of 100 nm or less. It consists of either metallic glass containing crystals or metallic glass containing 50% or more by volume of vitreous metal structure,
    The bulk body according to claim 1, wherein an interval between grooves of the lattice is set within a range of less than 10 μm.
  3.   The bulk body according to claim 2, wherein an interval between the grooves of the lattice is set in a range of 527 nm to 1217 nm.
  4. The grooves of the lattice have two or more different spacings;
    The bulk body according to claim 2, wherein the interval is at least two different intervals of any one of 1020 nm, 784 nm, and 659 nm.
  5.   Bulk body according to any of claims 2 to 4, characterized in that the grooves of the lattice further have two or more different groove angles.
  6.   The bulk material according to claim 2, wherein the metallic glass contains Pt as a main component.
  7.   The bulk body according to any one of claims 1 to 6, wherein at least a part of the lattice is formed on at least a part of the character or the figure in the thickness direction.
  8.   An exterior part or a movement for wristwatches, a jewelry, a tag, or a fastener, comprising the bulk body according to claim 1.
  9. Form characters or figures in the bulk body,
    After the character or figure is formed, the character or figure is heated,
    In addition, a mold on which one or more shapes of a predetermined lattice, slit, protrusion, hole, or latent image is formed is pressed against a character or a figure, and the lattice, slit, protrusion, hole, or Transferring any one or more of the latent images to at least a part of a character or graphic;
    After the transfer, the character or figure is cooled to release the pressing of the mold, the mold is released from the character or figure,
    Cool the characters or figures further,
    Alternatively, prepare a mold having at least one of a predetermined lattice, slit, protrusion, hole, or latent image and a character or figure, and melt the bulk material. ,
    A molten bulk material is poured into the mold, and at least a part of a predetermined lattice, slit, protrusion, hole, or latent image is formed on at least a part of a character or a figure by casting. A method for producing a bulk body.
  10. At least a part of the character or the figure is a metallic glass containing a vitreous metallic single phase, a metallic glass containing a vitreous metallic single phase having a supercooled liquid temperature range of 30 K or more at a heating rate of 0.67 K / s, 100 nm While formed with either a metal glass containing crystals having the following particle size, or a metal glass containing a vitreous metal structure at a volume ratio of 50% or more,
    Furthermore, after the formation of the character or the figure, a mold in which the shape of the lattice is formed among the predetermined lattice, slit, protrusion, hole, or latent image is prepared,
    The interval between the grooves of the lattice is set within a range of less than 10 μm,
    At least heat the metallic glass,
    Press the mold on which the predetermined shape of the lattice is formed on the heated metal glass, and transfer the lattice to the metal glass,
    After the transfer, the metal glass is cooled to release the pressing of the mold, the mold is released from the metal glass,
    Cool the metal glass further,
    Or at least the shape of the lattice and the mold in which the shape of the character or the figure is formed, and melting the metal glass as the bulk material,
    The molten metal glass is poured into the mold, and the lattice is formed within at least a part of the character or the figure within a range of a groove interval of less than 10 μm by casting. Bulk body manufacturing method.
  11.   The method for producing a bulk body according to claim 10, wherein an interval between the grooves of the lattice is set in a range of 527 nm to 1217 nm.
  12.   The method for producing a bulk body according to claim 10 or 11, wherein at least two different intervals of 1020 nm, 784 nm, or 659 nm are formed as the grooves of the lattice.
  13.   The method for producing a bulk body according to any one of claims 10 to 12, wherein two or more different groove angles are further formed in the grooves of the lattice.
  14.   The method for producing a bulk body according to any one of claims 10 to 13, wherein the metallic glass is metallic glass containing Pt as a main component.
  15. While preparing a mold in which the shape of the lattice is formed, the pressing by the mold is applied to at least a part of the thickness direction of the character or the figure,
    Alternatively, the mold in which at least the shape of the lattice is formed in at least a part of the shape of the character or the figure in the thickness direction is prepared, the bulk material is melted, and the mold is melted. The method for producing a bulk body according to any one of claims 9 to 14, wherein the bulk body material is poured and the lattice is formed in at least a part of the character or the figure in a thickness direction by casting. .
  16.   A wristwatch exterior part, movement, accessory, or accessory comprising at least part of a wristwatch exterior part, movement, accessory, tag, or fastener, comprising the bulk body according to any one of claims 9 to 15. , Tag, or fastener manufacturing method.
JP2014069997A 2013-10-04 2014-07-30 Bulk body, wristwatch exterior parts or movements, jewelry, tags, or fasteners, and methods of manufacturing the same Pending JPWO2015049913A1 (en)

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002357707A (en) * 2001-06-01 2002-12-13 Toppan Printing Co Ltd Prism array pattern
US20040057113A1 (en) * 2000-04-15 2004-03-25 Tompkin Wayne Robert Pattern
JP2004347828A (en) * 2003-05-22 2004-12-09 Dainippon Printing Co Ltd Authenticity judgment article
JP2007164068A (en) * 2005-12-16 2007-06-28 Gunma Univ Optical element, molding metal mold, method for making of optical element, microchemical chip, and spectroscopic analysis unit
WO2013104917A1 (en) * 2012-01-13 2013-07-18 Andrew Richard Parker Security device

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20040057113A1 (en) * 2000-04-15 2004-03-25 Tompkin Wayne Robert Pattern
JP2002357707A (en) * 2001-06-01 2002-12-13 Toppan Printing Co Ltd Prism array pattern
JP2004347828A (en) * 2003-05-22 2004-12-09 Dainippon Printing Co Ltd Authenticity judgment article
JP2007164068A (en) * 2005-12-16 2007-06-28 Gunma Univ Optical element, molding metal mold, method for making of optical element, microchemical chip, and spectroscopic analysis unit
WO2013104917A1 (en) * 2012-01-13 2013-07-18 Andrew Richard Parker Security device

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