JP2001100623A - Optical recording medium and method for discriminating authenticity of article - Google Patents

Abstract

PROBLEM TO BE SOLVED: To discriminate authenticity of an article by a hologram which is difficult to be forged and thereby to prevent forgery. SOLUTION: A mark 3 which enables the article to be discriminated is formed on a light translucent resin member 11 by means of the hologram of grating processing or relief-shaped ruggedness, further data CGH4 expressing data of the article is produced by a computer and is formed at a periphery of the mark 3 on the light translucent resin member 11 and the light translucent resin member 11 is buried in the article 2. By reading-out and analyzing the data CGH4, authenticity of the article 2 is discriminated. The data CGH4 form a plurality of hologram patterns on the transparent light translucent resin member 11 and forms a reflecting film 12 thereon. Then the reflecting film 12 at an optical position is destroyed and the hologram pattern at that position is erased to become unreadable and thereby data of plural bits are expressed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical recording medium for judging the authenticity of cosmetics, bags, clothes, and other high-end brand goods by using holograms to prevent forgery, and a method of authenticating goods.

[0002]

2. Description of the Related Art As a conventional method for preventing counterfeiting of cosmetics, bags, clothes, and other high-end brand products, a mark representing a trademark such as a brand mark is printed on a label, tag, plate, or the like, and the printed material is printed. Partly attached,
A method of judging the authenticity of the product by this is common.
Further, as another method, for example, in a credit card or the like, a mark such as a trademark is formed on a card-like substrate by a hologram of a grating process or a relief-like unevenness.

[0003]

However, there is a problem that a printed matter in which a mark representing a trademark such as a brand mark is printed on a label, tag, plate or the like is easily forged, and the effect of preventing forgery is small. In addition, a method is also known in which a serial number, a barcode, or the like is attached to a position different from the brand mark of the product by engraving, printing, etc., and this is used for authenticity determination, but this is also destroyed by a forger, In some cases, it was removed and did not function as authenticity determination.

Further, the hologram and the relief-shaped irregularities formed by the grating process have a simple structure, and therefore have a problem that they are easily forged. Furthermore, this method cannot represent the serial number of the product.

The present invention has been made in view of the above-mentioned problems of the prior art, and provides an optical recording medium and a method of determining the authenticity of a product, which can determine the authenticity of the product by using a hologram that is difficult to forge, and can prevent the forgery. The purpose is to do.

[0006]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides an optical recording medium formed around a mark that enables a product to be identified by creating a hologram representing data of the product by a computer. It is intended to be embedded.

That is, according to the present invention, a mark for identifying a product is formed on a substrate with a first hologram or a relief-shaped unevenness formed by grating processing, and a second hologram representing data of the product is formed by a computer. An optical recording medium is provided which is formed around the mark on the substrate and which is embedded in a product.

According to the present invention, the authenticity of a product is determined by reading and analyzing the second hologram while the optical recording medium according to claim 1 or 2 is embedded in the surface of the product. A method for determining the authenticity of a featured product is provided.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS <First Embodiment> An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is an explanatory view showing a first embodiment of an optical recording medium and a method for determining the authenticity of a product according to the present invention, FIG. 2 is an explanatory view showing the structure of the optical recording medium in FIG. 1 in detail, and FIG. 4 is an explanatory diagram showing characteristics, FIG. 4 is an explanatory diagram showing an example of the data CGH in FIG. 1, and FIG. 5 is a block diagram showing a configuration of the data CGH reproducing device in FIG.

FIG. 1 shows an optical recording medium 1 and a cosmetic bottle 2 as an example of a product in which the optical recording medium 1 is embedded. The optical recording medium 1 of this example is constituted by a circular plate having a diameter of 4 mm, and the surface thereof is divided into 3 × 3 areas.
In the five areas, a mark (hereinafter simply referred to as a mark) 3 for identifying a product such as a mark representing a trademark is provided.
(ABC Inc. in the figure) (some shown as “registered trademark” in the figure) is formed, and data CGH (Compute) representing arbitrary data corresponding to the applied product is formed in the remaining four areas.
r generated hologram) 4 is formed.

The size of the optical recording medium 1 may be designed to be larger if the product is large, corresponding to the shape of the product to be embedded. Then, the optical recording medium 1 is fixed to a depression formed on the surface of the bottle 2 and having a size similar to that of the optical recording medium 1 using an adhesive or a double-sided tape.

FIG. 2 shows the structure of the optical recording medium 1 in detail. The data CGH4 in this example is of a reflection phase type, and a phase distribution corresponding to the reproduction light is recorded. Fig. 2 (4)
Indicates the side structure of the optical recording medium 1, particularly the data CGH 4 portion. In this example, the CGH is a binary CGH, and an optical depth based on the wavelength of the illumination light = 0, and irregularities corresponding to π are formed on a light-transmitting resin member 11 (acrylic, polycarbonate, or the like) as a substrate. A metal reflective film 12 (aluminum, gold, etc.) is coated thereon, and a protective film 13 (UV curable resin, etc.) is further coated thereon. Light transmitting resin member 1
1 can be mass-produced by injection molding.

Here, the data CGH4 is, for example, Oplu.
s E, December 1996 issue, P83-88, “Phase type hologram” described in “Method for Optimizing Computer Hologram”. Specifically, by performing a Fourier inverse transform on the diffracted light position information corresponding to the desired diffraction angle using a computer,
A phase distribution corresponding to the interference fringes of the diffraction grating can be obtained. Then, a blaze (step-like step) corresponding to the phase distribution is formed on a glass substrate by applying a semiconductor manufacturing technique as shown in, for example, Japanese Patent Application Laid-Open No. 9-230121, and the blaze on the glass substrate is formed. It is transferred to a light transmitting resin member 11 as another substrate. In addition, binary C
GH is defined by dividing one cycle (2π) of the wavelength λ of incident light into two as shown in an enlarged manner in FIG.
It is π / 2, and is a CGH composed of two steps including a step-like step of 0π (part where no phase change is performed). Therefore, the n-value type CGH is defined as the wavelength λ of the incident light.
Is divided into n periods, and the phase difference for one value is 2π /
Here, n is a CGH composed of n steps including a step-like step of 0π (portion where no phase change is performed).

Marks such as characters and figures representing marks 3 are filled with gratings as shown in an enlarged manner in FIG. 2 (3). In this example, 2 μm-wide lines have a width of 1 μm.
A grating is formed at a pitch of μm. The grating depth is equal to the optical depth = similar to the data CGH4.
0 and π. Note that the grating pattern is called a rainbow hologram because it looks rainbow under natural light.

The characteristics of a rainbow hologram (grating) will be described with reference to FIG. FIG. 3A shows the relationship between the order of diffraction and the intensity. The intensity of the diffracted light is highest in the first order, and decreases in the order of the third, fifth, and so on. The relationship between the observation angle and the hue can be calculated from the equation (1) in FIG. 3, and when the first- and third-order diffracted lights having relatively high intensities are calculated, the result is as shown in FIG. 3 (2). From the results,
As shown in FIG. 3 (3), when the rainbow hologram is observed with white light, it can be seen that the color looks different when observed at different angles.

FIG. 4 shows an example of the data CGH4. The information recorded as the data CGH4 has the same design (mark) as the mark 3, so that the data CGH4
When the data CGH reproducing device 100 irradiates the image with illumination light, the same reproduced image as the mark is reproduced. Therefore,
In this case, if the data CGH4 and the reproduced images of the mark 3 are compared and recognized as the same, the optical recording medium 1 and
The product (bottle) 2 in which this is embedded can be determined to be genuine.

FIG. 5 schematically shows the data CGH reproducing apparatus 100 shown in FIG. In FIG. 5, data C
When the GH 4 (and the mark 3) is illuminated by the coherent light of the illuminating device 101, the illuminating light interferes while being reflected by the data CGH 4, and the diffracted light is received by the light receiving device 102. The light receiving device 102 is a two-dimensional image sensor such as a CCD or a PD, and therefore can measure the position and intensity of two-dimensional diffracted light. The diffracted light intensity distribution signal output from the light receiving device 102 is
, The light intensity of the zero-order light is replaced with “0”, the entire diffracted light intensity excluding the zero-order light is amplified with a predetermined gain, and sent to the diffracted light recognition device 104. The diffracted light recognition device 104 compares the plurality of diffracted light intensity distribution data registered in advance as reference data with the data sent from the zero-order optical processing device 103, thereby authenticating the optical recording medium 1 (and thus the product 2). Is determined.

FIG. 6 shows another example of the data CGH4. The information recorded as the data CGH4 is a mark (four petals) different from the mark 3. In this case, when the illumination light is applied to the data CGH4, an arbitrary reproduced image designed is reproduced. Therefore, when the reproduced image and the design value are compared and recognized as the same, the optical recording medium 1 and the embedded data are embedded. The determined product 2 is genuine. The information recorded in the data CGH4 is not limited to the image information of the present example, and may be in any form such as a number, a symbol, or a coded serial number.

FIG. 7 shows an example in which the appearance of the optical recording medium 1 and the hologram arrangement are modified. In the modification shown in FIG. 7A, one mark 3 is formed large in the center of the circular optical recording medium 1, and a plurality of data CGHs 4 are formed around the mark. The external shape of the optical recording medium 1 is not limited to a circle, but may be a circle, a rectangle, or a polygon corresponding to a product to be embedded. The arrangement of the data CGH4 and the mark 3 is not limited, and may be freely mixed. In the modification shown in FIG. 7 (2), five data CGH4 are stored on the rectangular optical recording medium 1.
Are arranged in a cross shape, and four marks 3 are arranged in the remaining corner portions. In the modification shown in FIG. 7C, one mark 3 is formed large at the center of the triangle.
Three marks 3 are arranged at each corner.

<Second Embodiment> FIG. 8 shows an optical recording medium according to a second embodiment. As in the first embodiment,
The surface of the optical recording medium 1 is divided into 3 × 3 areas, and marks 3 (ABC Inc in the figure) are formed in five areas.
In the second embodiment, data CGH units are formed in the remaining four areas so that more data can be represented by the data CGH4, and one CGH unit has 2 × 2 = 4 data CGH4. (Total 16)
It is composed of

Next, a method of representing data by the data CGH4 will be described. This data CGH4 forms a plurality of hologram patterns on the light-transmitting resin member 11, forms a reflection film 12 thereon, destroys the reflection film 12 at an arbitrary position, and makes it impossible to read the hologram pattern at that position. It is configured to represent a plurality of bits of data by erasing. FIG. 9 shows that three-bit data is represented by three hologram patterns (roughness in the figure) for the sake of simplicity. FIG. 9A shows that all three hologram patterns are formed. In this case, the incident light passes through the light transmitting resin member 11 and is reflected by the reflection film 12, and at this time, the light transmitting resin member 3 provided for 11
Since all the three irregularities cause a phase difference in the reflected light and generate diffracted light, 3-bit data = 111 is represented.

FIG. 9 (2) shows, as an example, that the second bit becomes unreadable by erasing the metal reflective film 12 corresponding to the second bit of the 3-bit data with a laser beam, thereby representing 3-bit data = 101. Is shown. A laser suitable for precision processing, such as a YAG laser or a CO ₂ laser, is used. When the laser light is irradiated, the laser light passes through the light transmitting resin member 11 and only the metal reflection film 12 sublimes. Therefore, at the place where the laser is irradiated, the metal reflective film 1
2 does not exist, the incident light cannot be returned, and no light diffraction phenomenon occurs, and no CGH reproduction light occurs. Therefore, it is possible to make the location where the laser is irradiated unreadable and represent 1-bit data = 0.

As shown in FIG. 9 (3), when the protective film 13 side of the optical recording medium 1 is buried with the protective film 13 facing the surface of the product 2, the material of the product 2 is made of a metal having a high reflectance. Alternatively, when a material having a high reflectance is coated, the incident light transmitted through the protective film 13 from the location where the reflective film 12 has been erased is reflected back on the surface of the product 2 and mixed with the reproduction light. May disturb the reproduced image. Therefore, instead of FIG. 9 (1), an anti-reflection film 14 is further formed on the protective film 13 of the optical recording medium 1 as shown in FIG. 9 (1) ′, thereby absorbing incident light and suppressing reflection. . Antireflection film 14 Cr _x O _y (chromium oxide), an oxide film such as Ti _x N _y (titanium nitride), formed by a sputtering apparatus. As another method, the surface on the side of the embedded product 2 is processed into a satin finish by machining such as sand blasting as shown in FIG. 9 (3) ′ instead of FIG. 9 (3) ′ (15 in FIG. This surface may diffuse the incident light so that it does not return as reflected light.

FIGS. 10 and 11 show one data CGH4 in order to represent 4-bit data by one data CGH4.
Shows a case where is constituted by four petals.
Also, one data CGH unit has four data CGs.
H4, and a total of 4 per optical recording medium
× 4 data CGH4, 3
When one optical recording medium 1 is embedded in one product 2, the product 2 can be represented by data of 4 × 4 × 3 = 48 bits. Therefore, it is possible to record a large data amount, and the recording data includes a serial number,
Product-specific information can be recorded. Note that the reproduction in this case can be performed for each data CGH unit by the two-dimensional imaging device.

FIGS. 12 and 13 show, as an example of a product, a mounting method when the optical recording medium 1 (CGH pellet 1) is embedded in the sprayer 2a mounted on the spray cosmetic bottle 2. FIG. As a method for manufacturing CGH pellets, a “molded plate punching method” in which a large number of CGH pellets 1 are formed on one substrate, and then the substrate is cut for each CGH pellet 1, and a large number of CGH pellets 1 There is a "takoyaki molding method" that separates after molding like a part. The CGH pellets 1 thus formed are bonded to the adhesive layer 16 with the reflecting film 12 side of each CGH pellet 1.
And embedded in the side surface of the resin or metal atomizer ring 2b. Then, the atomizer 2a is formed by the atomizer ring 2b.
And the sprayer 2a is attached to the opening of the bottle 2.

According to the present invention, the following inventions are provided in addition to the inventions described in the claims.
(1) A mark for making a product identifiable is formed on a substrate by a first hologram or relief-shaped unevenness formed by grating processing, and a second hologram representing the same mark is created around the mark by a computer. An optical recording medium formed and embedded in a product.
(2) A method of embedding the optical recording medium according to any one of claims 1 and 2 and (1) in a surface of a product, wherein the surface of the product in which the optical recording medium is embedded is satin-finished. By diffusing the incident light, 0
An authenticity judgment method characterized by reducing the reflection of secondary light.

[0027]

As described above, according to the present invention, a hologram representing product data is created by a computer, formed around a mark that allows the product to be identified, and this substrate is embedded in the product. Therefore, it is possible to judge the authenticity of the product by using a hologram that is difficult to forge, thereby preventing forgery.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram showing a first embodiment of an optical recording medium and a method for determining the authenticity of a product according to the present invention.

FIG. 2 is an explanatory diagram showing the structure of the optical recording medium of FIG. 1 in detail.

FIG. 3 is an explanatory diagram showing characteristics of a rainbow hologram.

FIG. 4 is an explanatory diagram showing an example of data CGH of FIG. 1;

FIG. 5 is a block diagram showing a configuration of the data CGH reproducing device of FIG.

FIG. 6 is an explanatory diagram showing another example of the data CGH of FIG. 4;

FIG. 7 is an explanatory view showing an appearance of an optical recording medium and a modified example of a hologram array.

FIG. 8 is an explanatory diagram illustrating an optical recording medium according to a second embodiment.

FIG. 9 is an explanatory diagram showing the structure of data CGH in FIG. 8 in detail.

FIG. 10 is an explanatory diagram showing an example of data CGH in FIG. 8;

11 is an explanatory diagram showing the contents of data based on the data CGH of FIG. 10;

FIG. 12 is an explanatory diagram showing an example of attaching an optical recording medium to a product.

FIG. 13 is an explanatory diagram showing an example of attaching an optical recording medium to a product.

[Explanation of symbols]

 1 Optical recording medium (CGH pellet) 2 Product (bottle) 3 Registered trademark (mark) 4 Data CGH

Claims (3)

[Claims] A first hologram or relief-shaped unevenness formed on the substrate by a grating process, and a second hologram representing data of the product is created by a computer to form the mark on the substrate. An optical recording medium formed around the above-mentioned mark and embedding the substrate in a product. 2. The second hologram has a plurality of hologram patterns formed on a transparent substrate, a reflection film is formed thereon, and the reflection film at an arbitrary position is destroyed to form a hologram pattern at that position. 2. The optical recording medium according to claim 1, wherein the data is represented by a plurality of bits by erasing the data in an unreadable manner. 3. The authenticity of a product is determined by reading and analyzing the second hologram with the optical recording medium according to claim 1 embedded in the surface of the product. Authentication method.