WO2005121048A1

WO2005121048A1 - Tile with two-dimensional code and process for producing the same

Info

Publication number: WO2005121048A1
Application number: PCT/JP2004/008570
Authority: WO
Inventors: Masahiro Kubuki
Original assignee: Masahiro Kubuki
Priority date: 2004-06-11
Filing date: 2004-06-11
Publication date: 2005-12-22
Also published as: JPWO2005121048A1

Abstract

A tile with a two-dimensional code comprises substantially planar substrates (2, 42) formed of a ceramic material, glaze layers (3, 43, 44, 45, 46) formed with colors different from those of the substrates (2, 42) by burning a glaze applied to the surface of the burned substrates (2, 42), and a plurality of micro recesses (4, 47) formed to penetrate the glaze layers (3, 43, 44, 45, 46) and forming two-dimensional code pattern parts (5, 48).

Description

Description Tile with two-dimensional code

The present invention relates to a tile with a two-dimensional code and a method for manufacturing the same. Background art

Japanese Patent Laying-Open No. 9-131553 (hereinafter referred to as Patent Document 1) discloses a laminate. This laminate is formed by laminating two ceramic layers having different lightness, and an opening is formed in one of the ceramic layers from the surface of the ceramic layer to the other ceramic layer. Have been. An identification mark is formed by the difference in brightness between the two ceramic layers viewed from one ceramic layer side.

Patent Document 1 discloses an example of a percode as an identification mark. Patent Literature 1 describes that a two-dimensional code other than a bar code can be formed by the structure of the laminate. Patent Document 1 discloses a combination of white and black as an example of a combination of colors of two ceramic layers having different lightness.

Patent Document 1 discloses that in such a laminate, the ceramic layer in which an opening is formed is preferably formed to have a thickness of 0.5 to 5.0 mm. Patent Document 1 discloses that the opening can be formed by any of sandblasting and laser processing. Patent Literature 1 states that the joining of two ceramic layers is not only performed by firing when forming a laminate, but also by various methods such as self-adhesion by drying and adhesion with a transparent or translucent inorganic adhesive. Disclose what can be done. However, when forming a two-dimensional code by forming an opening in the laminate disclosed in Patent Document 1, the following problems can be considered.

The two-dimensional code has finer and more complex graphics than the per-code. Therefore, when forming a two-dimensional code on a laminate, much higher processing accuracy is required than when forming a bar code.

. For example, when forming a QR code, which is a type of two-dimensional code, on a tile with a side of about 5 cm, a groove may be formed with a width of tens to hundreds of micrometers, or a length of a side of tens to hundreds of micrometers. Square holes and protrusions of several hundred micrometers must be formed.

Laser processing must be employed for such high-precision processing. It is difficult to achieve such high precision processing in sandblasting.

Further, the opening formed in the laminate of Patent Document 1 needs to be formed so as to penetrate one ceramic layer having a thickness of 0.5 to 5.0 mm. Ceramic is a hard and brittle material.

In such hard and brittle materials, openings with a width of several tens to several hundreds of micrometers and a depth of 0.5 mm or more are opened, thereby achieving the accuracy required for two-dimensional codes. It is extremely difficult to obtain the outline of a figure even if it is processed by laser processing.

Even if these processing problems could be cleared, even if a two-dimensional code was to be formed by forming an opening in the laminate disclosed in Patent Document 1, the following problems would be further solved. Can be considered.

In Patent Document 1, a two-dimensional code formed on a laminate is read by an optical reading device such as a laser scanner formed so as to be readable. In Patent Document 1, the two-dimensional code formed on the laminate is Reading and decoding with a general-purpose device such as a mobile phone terminal is not considered. When the two-dimensional code formed on the laminate is imaged by a general-purpose device such as a mobile phone with a camera, and the two-dimensional code is decoded based on the captured image, the two-dimensional code formed on the laminate is required. Absolutely higher accuracy is required for the outline of the figure as a two-dimensional code formed on the laminate than when reading and decoding with a reading device developed exclusively for reading code .

Therefore, even if a two-dimensional code can be formed on the laminate disclosed in Patent Document 1, it is necessary to capture and decode the two-dimensional code using a general-purpose device such as a mobile phone terminal with a camera. Is extremely difficult.Also, even though a general-purpose device such as a camera-equipped mobile phone terminal may be able to decode the two-dimensional code formed on the laminate disclosed in Patent Document 1, the groove is deep. Therefore, due to shadows in the grooves and other factors, the shape of the two-dimensional code when viewed from an oblique direction is different from that when the two-dimensional code is viewed from directly above. Become. As a result, it becomes even more difficult to image and decode with a general-purpose device such as a camera-equipped mobile phone terminal from a direction shifted from directly above the two-dimensional code.

The inventor has conducted intensive studies in order to solve the above-mentioned problems. As a result, the inventor has completed the present invention.

An object of the present invention is to provide a tile with a two-dimensional code that can form a two-dimensional code with high accuracy, and a method for manufacturing the same. Disclosure of the invention

The tile with a two-dimensional code according to the present invention is substantially made of a ceramic material. It is formed by attaching a glaze to the plate-shaped base material, firing the base material, and firing the base material.The glaze layer is formed in a different color from the base material, and is formed through the glaze layer. And a plurality of minute concave portions forming a two-dimensional code pattern portion.

If this configuration is adopted, a plurality of minute recesses for forming the two-dimensional code pattern portion are formed through the glaze layer. Moreover, this glaze layer is formed by attaching a glaze to the surface of the fired base material and firing it. Therefore, the thickness of the glaze layer is small, and the depth of the minute recesses formed in the glaze layer is shallow. As a result, a two-dimensional code of a tile with a two-dimensional code adopting this configuration can be formed with high accuracy.

Another two-dimensional code-attached tile according to the present invention is a 10-μm-sized tile formed by attaching a substantially plate-shaped base material made of a ceramic material and a glaze to the fired surface of the base material, followed by firing. A glaze layer formed to a thickness of 100 μm or more and 100 μm or less and having a color different from that of the base material, and a plurality of fine particles formed through the glaze layer to form a two-dimensional code pattern portion. And a recess.

If this configuration is adopted, a plurality of minute recesses for forming the two-dimensional code pattern portion are formed through the glaze layer. Moreover, the glaze layer is formed to have a thickness of not less than 100 micrometer and not more than 100 micrometer by applying a glaze to the surface after firing the base material and firing. Therefore, the thickness of the glaze layer is small, and the depth of the minute recesses formed in the glaze layer is shallow. As a result, a two-dimensional code of a tile with a two-dimensional code employing this configuration can be formed with high accuracy. In addition, the height from the base material exposed by the minute recesses to the surface of the glaze layer is approximately 100 micrometers or less, and these surfaces can be regarded as forming a single plane. . The third tile with a two-dimensional code according to the present invention is obtained by sintering a substantially plate-shaped base material made of a ceramic material and attaching a glaze to the surface of the baked base material. A two-dimensional code pattern formed by forming a plurality of glaze layers having different colors from the base material and different colors from each other and at least one glaze layer among the plurality of glaze layers; And a plurality of minute concave portions forming a portion.

By employing this configuration, a plurality of minute concave portions for forming the two-dimensional code pattern portion are formed so as to penetrate at least one glaze layer among the plurality of glaze layers. In addition, the plurality of glaze layers are formed by attaching a glaze to the surface of the fired base material and firing. Therefore, the thickness of the plurality of glaze layers is thin, and the depth of the minute concave portions formed in the glaze layer is shallow. As a result, the two-dimensional code of the tile with the two-dimensional code adopting this configuration can be formed with high accuracy.

The fourth two-dimensional code-attached tile according to the present invention is obtained by attaching a glaze to a substantially plate-shaped base made of a ceramic material, and then firing the base by firing the base. A plurality of glaze layers formed in a thickness of 100 μm or more and 100 μm or less and having a different color from the base material and different colors from each other; And a plurality of microscopic portions formed through at least one glaze layer to form a two-dimensional code pattern portion.

By employing this configuration, a plurality of minute concave portions for forming the two-dimensional code pattern portion are formed so as to penetrate at least one glaze layer among the plurality of glaze layers. Moreover, the plurality of glaze layers are formed to have a thickness of not less than 10 micrometer and not more than 100 micrometer by applying a glaze to the surface after firing the base material and firing. Therefore, the thickness of the plurality of glaze layers is thin, and the depth of the minute recess formed in the plurality of glaze layers is shallow. As a result, a two-dimensional code of a tile with a two-dimensional code employing this configuration can be formed with high accuracy. In addition, the height from the base material exposed by the minute concave portions to the surface of the plurality of glaze layers is approximately 100 m or less, and these surfaces are considered to form a single plane. Can be.

In the tile with a two-dimensional code according to the present invention, in addition to the configuration of each of the above-described inventions, the base material has a square shape having a side of 2 cm or more and 12 cm or less, and the minute concave portion is formed by laser processing. It is formed on the surface of the substrate after the glaze layer or a plurality of glaze layers are formed by firing.

If this configuration is adopted, a two-dimensional code part with a precision of 2 cm or more and 12 cm or less on each side can be captured and decoded by a general-purpose device such as a camera-equipped mobile phone terminal. Can be formed.

The tile with a two-dimensional code according to the present invention has another glaze layer formed by attaching a transparent glaze and firing it on the outermost surface in addition to the configuration of each of the above-described inventions.

With this configuration, a transparent glaze layer can be formed on the outermost surface. Moreover, the glaze of this glaze layer enters into a plurality of minute recesses. Therefore, the surface of the tile with the two-dimensional code becomes flat. As a result, the glaze layer is less likely to be chipped or peeled off, and the shape of the two-dimensional code portion can be maintained in a readable shape for a long period of time.

In the tile with a two-dimensional code according to the present invention, in addition to the configuration of each of the above-described inventions, the two-dimensional code formed in the two-dimensional code pattern portion is a QR code, a micro QR code, a PDF 417 code or a PDF 417 code. This is the code of the D ata Matrix.

If this configuration is adopted, a two-dimensional code pattern part is formed by forming a combination of linear minute concave parts and square minute concave parts. be able to. In the linear minute concave portion and the square minute turning portion, the contour of the minute concave portion is more easily formed by laser processing than in the case of forming a circular minute concave portion, for example.

In the tile with a two-dimensional code according to the present invention, in addition to the constitution of each of the above-mentioned inventions, the base material is formed of a ceramic material which becomes black after firing, and at least one of the glaze layer or the plurality of glaze layers is provided. One is formed of a material that turns white after firing.

With this configuration, a black two-dimensional code pattern portion can be formed on a white background.

The tile with a two-dimensional code according to the present invention, in addition to the configuration of each of the above-described inventions, further includes a character around the two-dimensional code pattern portion along at least two opposing sides of the outer periphery of the two-dimensional code pattern portion. Or, a figure is formed.

If this configuration is adopted, for example, when imaging a two-dimensional code pattern portion with a general-purpose device such as a camera-equipped mobile phone terminal, a user of the device will surround the two-dimensional code pattern portion with the outer periphery. The device is positioned with respect to the two-dimensional code pattern so that characters or figures formed along the two opposing sides can be read. As a result, general-purpose devices, such as camera-equipped mobile phone terminals, can be positioned almost directly above the two-dimensional code pattern part, even if the user of the device is not clearly conscious. The method of manufacturing a tile with a two-dimensional code according to the present invention includes the steps of: attaching a glaze of a color different from that of the base material onto a substantially plate-shaped base material formed of a ceramic material; And a step of irradiating a laser beam so as to form a two-dimensional code pattern portion, and forming a plurality of minute concave portions penetrating the layer by the glaze. If this method is adopted, a plurality of minute concave portions for forming the two-dimensional code pattern portion are formed through the glaze layer. Moreover, this glaze layer is formed by attaching a glaze to the surface of the fired base material and firing it. Therefore, the thickness of the glaze layer is small, and the depth of the minute recesses formed in the glaze layer is shallow. As a result, the two-dimensional code pattern portion of the tile with the two-dimensional code employing this configuration can be formed with high accuracy. The two-dimensional code pattern part can be imaged and decoded by a general-purpose device such as a mobile phone terminal with a camera.

In another method for manufacturing a tile with a two-dimensional code according to the present invention, a plurality of glazes of different colors and different colors from the base material are attached on a substantially plate-shaped base material formed of a ceramic material. And a baking step after the adhering step, and irradiating a laser beam so as to form a two-dimensional code pattern portion, so that a plurality of glaze layers penetrate at least one of the plurality of glaze layers. Forming a minute concave portion of the above.

If this method is adopted, a plurality of minute concave portions for forming the two-dimensional code pattern portion are formed so as to penetrate at least one glaze layer among the plurality of glaze layers. In addition, the plurality of glaze layers are formed by sintering a glaze on the surface after the base material is fired. Therefore, the thickness of the plurality of glaze layers is small, and the depth of the minute concave portions formed in the plurality of glaze layers is shallow. As a result, the two-dimensional code pattern portion of the two-dimensional code-attached tile employing this configuration can be formed with high accuracy. The two-dimensional code pattern portion can be imaged and decoded by a general-purpose device such as a mobile phone terminal with a camera.

The method for manufacturing a tile with a two-dimensional code according to the present invention includes, in addition to the configuration of each of the above-described inventions, a step of attaching a transparent glaze from above the glaze layer after the step of forming a plurality of minute concave portions. And after the process of applying a transparent glaze And a step of forming.

By employing this method, a transparent glaze layer can be formed on the base material and the glaze layer or a plurality of glaze layers. In addition, the glaze of this glaze layer enters into a plurality of minute concave portions. Therefore, the surface of the two-dimensional coded tile becomes flat. As a result, the glaze layer is less likely to be chipped or peeled off, and the shape of the two-dimensional code portion can be maintained in a readable shape for a long time. Brief Description of Drawings

FIG. 1 is a diagram showing a tile with a two-dimensional code according to Embodiment 1 of the present invention.

FIG. 2 is a diagram showing the two-dimensional code-attached tile of FIG. 1 and a protector that accommodates the two-dimensional code-attached tile.

FIG. 3 is a diagram showing an example of an installation state of the two-dimensional code-attached tile and the protector shown in FIG.

FIG. 4 is a block diagram showing a circuit configuration of a mobile phone terminal with a camera.

FIG. 5 is a perspective view showing a mobile phone terminal with a camera.

FIG. 6 is a diagram showing a state in which the camera-equipped mobile phone terminal shown in FIGS. 4 and 5 is capturing an image of a two-dimensional code pattern portion of a tile with a two-dimensional code embedded in the ground.

FIG. 7 is a flowchart showing a manufacturing process of the tile with the two-dimensional code shown in FIG.

FIG. 8 is a diagram showing a tile with a two-dimensional code according to Embodiment 2 of the present invention. BEST MODE FOR CARRYING OUT THE INVENTION

Hereinafter, a tile with a two-dimensional code and a method for manufacturing the same according to an embodiment of the present invention will be described with reference to the drawings.

Embodiment 1

FIG. 1 is a diagram showing a tile 1 with a two-dimensional code according to Embodiment 1 of the present invention. FIG. 1 (A) is a front view of a tile 1 with a two-dimensional code. FIG. 1 (B) is a side view of the tile 1 with a two-dimensional code. FIG. 1 (C) is a cross-sectional view of the tile 1 with the two-dimensional code of FIG. 1 (A) taken along the line AA. FIG. 1 (D) is a partially enlarged sectional view of the tile 1 with a two-dimensional code.

The tile 1 with a two-dimensional code has a base material 2. The base material 2 is formed of a material used for ceramics such as ceramics. Ceramics is an inorganic / non-metallic solid material such as porcelain clay (SiO ₂ ) whose main component is formed into a predetermined shape and then heated to a high temperature (for example, 1200 to 130000). (° C), it can be formed into any shape. In the first embodiment, a material that is entirely black in color after firing is used. The substrate 2 has a substantially square plate shape. One side of the square is about 5 cm. The thickness of the substrate 2 is about 8 mm.

The first glaze layer 3 is formed on the surface of the base material 2. The first glaze layer 3 is a glaze layer used for coloring ceramics. Glaze is a mixture of, for example, glass and other materials, and develops different colors depending on the combination of the colors of the materials used. In the first embodiment, a material that is entirely white and single color after firing is used. The first glaze layer 3 is formed on the entire surface of the substrate 2. The thickness of the first glaze layer 3 is about 10 to 20 micrometer.

The first glaze layer 3 and the substrate 2 are shown in Fig. 1 (C) and (D). As shown in FIG. The minute concave portions 4 are formed so as to penetrate the first glaze layer 3. The length of the minute concave portion 4 is greater than the thickness of the first glaze layer 3 (for example, several tens to several hundred micrometers). By forming such minute concave portions 4, the base material 2 is exposed on the surface of the tile 1 with the two-dimensional code.

The two-dimensional code pattern portion 5 is formed by the plurality of minute concave portions 4 and the first glaze layer 3 at the center of the substantially square surface of the two-dimensional code-added tile 1. The two-dimensional code pattern part 5 is composed of a white part by the first glaze layer 3 and a black part by the base material 2 exposed by the minute concave part 4. The two-dimensional code is a diagram that encodes digital data. Other codes that encode digital data include, for example, barcodes. A barcode is used as a figure that encodes several digits of numeric data because the amount of information that can be encoded is small. Examples of the two-dimensional code include a QR code (ISO / IEC1804), a micro QR code, a code of the PDF417 format, a code of the DataMatrix format, and a MaxiCode.

The QR code, the DataMatRi.x system code, and the MaxiCode are each a kind of matrix code. PDF 417 is a type of stacked barcode. Whereas barcodes can only encode very few digits of numeric data, these two-dimensional codes can encode hundreds to thousands of digits of numeric data. . In particular, the QR code and the PDF 417 code can encode thousands of digits of numeric data. The QR code, the microphone QR code, and the DataMatRix code are characterized in that the size of the coded figure is small and the space is saved.

QR code, micro QR code, PDF 417 code, D a The code of the ta matrix method can be formed by combining only squares. On the other hand, Maxi Code uses a circle.

In the tile 1 with a two-dimensional code according to the first embodiment, a QR code pattern is formed in the two-dimensional code pattern section 5. The QR code has the features of space saving and large capacity as described above. The QR code has a function of correcting an error when reading digital data. Therefore, even if a part of the tile 1 with a two-dimensional code is missing or cracked, the QR code is likely to be maintained in a state where decoding is possible.

The digital data to be encoded into the QR code may be data consisting of only the same numbers as the bar code. However, taking advantage of its large capacity, for example, character data, It may be image data, audio data, or the like.

The character data to be encoded into the QR code is, for example, the latitude / longitude or the address of the place where the tile 1 with 2D code is installed, or the tile 1 with 2D code. There are text data of the survey result of landform or boring survey of land parcels, and text data of management and guidance of facilities around the place where tile 1 with 2D code is installed.

The image data to be encoded into the QR code is, for example, image data related to facilities and roads around the place where the tile 1 with a two-dimensional code is installed, and the tile 1 with a two-dimensional code Map data as a guide map from the point to the surrounding facilities, 2D-coded tiles 1 are installed Image data of land parcel topography or drilling survey results, 2D-coded tiles 1 are installed There are photographic data before construction of land facilities. The audio data encoded in the QR code is, for example, audio data that reads the latitude and longitude or the address of the location where the tile 1 with 2D code is installed, the location where the tile 1 with 2D code is installed Tile 1 with two-dimensional code is installed.Tile 1 with two-dimensional code is installed.Tile 1 with two-dimensional code is read out. There is audio data for the management and guidance of the facilities around the location where it is located.

Around the two-dimensional code pattern part 5, an enclosing character part 6 is formed along four sides of the two-dimensional code pattern part 5. The encircled character portion 6 is formed by the plurality of minute concave portions 4 and the first glaze layer 3. In the surrounding character portion 6, a black character is formed on a white background. By making the characters in the enclosing character part 6 black characters on a white background, the color scheme is the same as that of characters written with a pen on paper. It is easier to do.

In the encircled character portion 6 of the two-dimensional code-added tile 1 of the first embodiment, along with the four sides of the two-dimensional code pattern portion 5, "http: / www-" and "ace **." Four character strings are formed, such as “commj”, “Location information service”, and “Ace **”. “Location information service” indicates that tile 1 with a two-dimensional code is installed for location information service. “Ace ** Co., Ltd.” is the name of the company that installed tile 1 with a two-dimensional code. "Http: // www." And "acce **. Comm" are URL (UniformResouurceLorc) of the website established by the business operator.

A character string other than the above-described character string may be formed in the surrounding character part 6 around the two-dimensional code pattern part 5. For example, a two-dimensional code Form 1 address of the installation location, name of the administrator of the tile 1 with 2D code, address, telephone number, URL of the website that can use the data encoded in the 2D code, etc. Is also good. Further, in the encircling character portion 6, something other than a character, for example, a character or various figures may be arranged and formed.

On the first glaze layer 3 and the substrate 2, a second glaze layer 7 is formed as shown in FIGS. 1 (C) and 1 (D). The second glaze layer 7 is formed of a transparent material used for polishing porcelain. Note that the second glaze layer 7 may be formed of a translucent material that does not impair the visibility and properties of the two-dimensional code pattern portion 5. The second glaze layer 7 is formed on the entire surface of the substrate 2. The second glaze layer 7 also penetrates into the plurality of minute recesses 4. Due to the formation of the second glaze layer 7, the surface of the tile 1 with a two-dimensional code becomes substantially flat despite the formation of the plurality of minute recesses 4.

Next, an example of installation of the tile 1 with a two-dimensional code according to Embodiment 1 of the present invention will be described.

FIG. 2 is a diagram showing the two-dimensional code-added tile 1 of FIG. 1 and a protector 11 for accommodating the two-dimensional code-added tile 1. Fig. 2 (

(A) is a front view of a tile 1 with a two-dimensional code and its protector 11. FIG. 2 (B) is a cross-sectional view taken along the line BB of the tile 1 with the two-dimensional code of FIG. 2 (A) and its protector 11. Fig. 2 (C)

, Fig. 2 (A) Tile 1 with two-dimensional code and its protector 1

1 is a perspective view of FIG.

The protector 11 has a protector body 12, a lip portion 13, an inclined portion 14, a boundary point indicating portion 15, and an anchor bolt 16. The protector 11 is made of metal. Protector 1 1 is forged, machined It is formed by a method such as shishi.

The protector body 1 2 has a substantially square plate shape larger than the two-dimensional code-attached tile 1. A through hole 17 is formed at the center of the protector body 12. The through hole 17 has a substantially quadrangular prism shape slightly larger than the two-dimensional corded tile 1. The rib portion 13 is formed along the inner periphery of the through hole 17 so as to protrude into the through hole 17 at an end near the upper surface of the protector body 12 of the through hole 17. The boundary point indicating section 15 is formed at one corner of the protector body 12. The inclined portion 14 is formed so that the outer peripheral portion of the protector main body 12 has a divergent shape from the upper surface to the lower surface of the protector main body 12. The anchor bolt 16 is attached to the back of the protector body 12 by screwing.

The tile 1 with the two-dimensional code is accommodated in the through hole 17 of the protector body 12. In the state of being stored in the protector body 12, the upper surface of the tile 1 with the two-dimensional code on which the two-dimensional code pattern is formed is on the upper surface side of the protector body 12.

The protector 11 has a rib 13 at an end near the upper surface of the through hole 1 Ί. When the two-dimensional corded tile 1 is housed in the protector body 12, it comes into contact with the back surface of the rib portion 13. The two-dimensional code-added tile 1 does not come out of the through hole 17 from the upper surface side of the protector body 12.

The two-dimensional code-attached tile 1 may be fixed in the protector body 12 with an adhesive or the like. In addition, a plate of approximately the same size as the protector body 12 is provided below the protector body 12 and the plate is fixed to the protector body 12 with an adhesive or the like, so that the through holes 17 are closed. The tile 1 with the two-dimensional code may be prevented from going out of the through hole 17. FIG. 3 is a diagram showing an example of an installation state of the tile 1 with a two-dimensional code and the protector 11 shown in FIG. FIG. 3 (A) is a diagram showing the installation state of the two-dimensional corded tile 1 and the protector 11 when the protector 11 containing the two-dimensional corded tile 1 is directly buried in the ground. . When burying the protector 11 directly on the ground, it is recommended that the protector 11 be buried in the ground partway along the slope 14. By burying the protector 11 in the ground halfway along the slope 14, people and objects are less likely to collide with the sides of the protector 11. Further, even if a person or a car is hit, the force applied to the protector 11 can be released along the slope of the slope. As a result, the protector 11 becomes less susceptible to the force of people or vehicles moving on the road surface, and is continuously buried in the buried position for a long time.

Fig. 3 (B) shows a two-dimensional case where the protector 11 accommodating the two-dimensional corded tile 1 is mounted on one side of the concrete block 21 and buried directly with the concrete block 21 in the ground. FIG. 2 is a view showing an installed state of a tile 1 with a cord and a protector 11; By integrating the protector 11 into the concrete block 21 and embedding it together with the concrete block 21 in this way, the protector 11 is more versatile than the case in Fig. 3 (A). The position is difficult to shift and it is difficult to peel off from the ground. Therefore, such burying is a suitable method in the case where the point indicated by the boundary point indicating section 15 of the protector 11 indicates, for example, the boundary of the property.

Thus, the tile 1 with the two-dimensional code can be buried together with the protector 11 on a road surface such as a paved road or a sidewalk, a parking lot, a park, or an underpass. In addition, for example, a protector 11 that accommodates a two-dimensional coded tile 1 may be used for buildings, bridges, buildings, etc. It may be installed on structures or vehicles. When installing the protector 11 on such a structure or vehicle, the protector 11 may be installed on a wall surface, a staircase, a ceiling, or other places other than the floor surface. Alternatively, the tile 1 with the two-dimensional code may be directly installed on a floor, a wall, a floor, a ceiling, or the like without using the protector 11.

Next, as shown in Fig. 3, how to use the two-dimensional code pattern section 5 of the two-dimensional code-added tile 1 buried in the ground, etc., using a mobile phone terminal with a camera as an example. Will be explained.

FIG. 4 is a block diagram showing a circuit configuration of the camera-equipped mobile phone terminal 31. FIG. 5 is a perspective view showing the mobile phone terminal with camera 31. As shown in FIG. 4, the camera-equipped mobile phone terminal 31 includes a color CCD (Charge-Coupled Device) camera 32, a numeric keypad and other input keys 33, a liquid crystal display 34, and information. It has a processing unit 35 and a communication unit 36. The information processing unit 35 is realized by the CPU executing a program.

Further, as shown in FIG. 5, the camera-equipped mobile phone terminal 31 has an upper frame 37 and a lower frame 38. Both the upper frame 37 and the lower frame 38 have a long rectangular shape. One longitudinal end of the upper frame 37 is rotatably connected to one longitudinal end of the lower frame 38. The upper frame 37 and the lower frame 38 rotate around this connection. The camera-equipped mobile phone terminal 31 can be folded so that the upper frame 37 and the lower frame 38 overlap each other. The low power consumption C-MOS type is preferred. The color CCD camera 3 2 is a folded state of the camera-equipped mobile phone terminal 3 1 , Is arranged at a position to be the outer surface of the upper frame 37. The input key 33 is provided at a position to be an inner surface of the lower frame 38. The liquid crystal display 34 is disposed at a position on the inner surface of the upper frame 37. FIG. 6 is a schematic view of the mobile phone terminal 31 with a force sensor shown in FIG. 4 and FIG. FIG. 3 is a diagram showing a state in which a two-dimensional code pattern section 5 of a two-dimensional code-added tile 1 buried in the ground is being imaged. The user of the mobile phone terminal 31 with power camera holds the lower frame 38 of the mobile phone terminal with camera 31 in a state where the upper frame 37 and the lower frame 38 are opened. The user makes the color CCD camera 32 disposed on the outer surface of the upper frame 37 face the two-dimensional code pattern part 5 of the two-dimensional code-added tyro-noise 1. The information processing section 35 displays an image captured by the color CCD camera 32 on the liquid crystal display 34.

In a state where the entire two-dimensional code pattern portion 5 of the tile 1 with a two-dimensional code is displayed on the liquid crystal display 34, the user operates the human power key 33. The information processing unit 35 extracts a two-dimensional code from the image data displayed on the liquid crystal display 34 at the timing when the input key 33 is operated.

When a two-dimensional code can be extracted from the captured image, the information processing section 35 decodes the extracted two-dimensional code. When the digital data obtained by decoding is character data, the information processing section 35 displays a character string based on the character data on the liquid crystal display 34. If the digital data obtained by the decoding is image data, the information processing section 35 displays an image based on the image data on the liquid crystal display 34. When the digital data obtained by the decoding is audio data, the information processing unit 35 outputs the audio based on the audio data from a speaker (not shown). . The user of the mobile phone terminal 31 with a power camera can read the character string displayed on the LCD display 34 or look at the image displayed on the LCD display 34 to obtain a tile with a two-dimensional code. Data decoded to 1 can be used.

If the two-dimensional code pattern cannot be extracted from the captured image, the information processing unit 35 displays the fact on the liquid crystal display 34, and then displays the image captured by the color CCD camera 32 on the liquid crystal display 34. Return to the state.

The information processing unit 35 displays an image based on the image captured by the color CCD camera 32 on the liquid crystal display 34, and as a back process, the image is captured by the color CCD camera 32. The process of extracting the two-dimensional code from the captured image may be repeatedly executed. In the case of this modification, when the two-dimensional code is extracted from the captured image, the information processing unit 35 displays that fact on the liquid crystal display 34, and an input operation to approve it is performed on the input key 33. Then, the decoding process of the approved two-dimensional code and the subsequent processes may be executed.

Next, a method of manufacturing the tile 1 with a two-dimensional code according to Embodiment 1 of the present invention will be described. FIG. 7 is a flowchart showing a manufacturing process of the tile 1 with a two-dimensional code shown in FIG.

In the manufacturing process of the tile 1 with a two-dimensional code shown in Fig. 1, first, ceramic clay, which is a mixture of water and powder of a material used for ceramics such as ceramics, is formed into a substantially square plate shape (step ST 1). The size to be formed is larger than the size of the base material 2 of the tile 1 with a two-dimensional code shown in FIG. 1 (for example, about 1.2 to 1.5 times the size).

Next, the substrate formed into a substantially square plate shape is dried in the sun, in the shade, etc., and then heated to the firing temperature (for example, 120 to 130 ° C.). Heat (step ST 2). Thus, a base material 2 having substantially the same size as the two-dimensional code-attached tile 1 shown in FIG. 1 is formed.

Next, a glaze is applied to the surface of the fired substrate (step ST 3). The glaze applied in this step becomes the first glaze layer 3 of the tile 1 with the two-dimensional code shown in FIG. Therefore, a material that turns white after firing is used as glaze.

Next, the glaze-attached dough is fired at a temperature lower than the main firing temperature (for example, about 800 to 900 degrees) (step ST4). By shifting the temperature at which the glaze layer is fired on the base material 2 lower than the temperature of the main firing of the base material 2, bleeding or the like does not easily occur at the boundary between the glaze layer and the base material 2. To attach the glaze, a transfer paper to which the glaze is attached may be used. By baking the transfer paper on the surface of the dough, it is possible to form a layer of glaze adhered to the transfer paper on the surface of the dough. When the above steps are completed, the tile 1 with the two-dimensional code having substantially the same size as the tile 1 with the two-dimensional code shown in FIG. It is formed.

Next, a plurality of minute recesses 4 are formed by laser processing on the surface of the two-dimensionally coded tile 1 comprising the base material 2 and the first glaze layer 3 (step ST5). A plurality of minute concave portions 4 are formed on the surface of the two-dimensional code tile 1 so that the two-dimensional code pattern portion 5 and the surrounding character portion of the two-dimensional code tile 1 shown in FIG. 1 are formed. . The minute concave portion 4 is formed at a depth penetrating the first glaze layer 3.

For the laser processing for forming the two-dimensional code pattern section 5 on the tile, for example, use a laser processing machine with a model number “ULS-25E” manufactured by Universal Laser System Co., Ltd., which is a small laser processing machine. Can be. This laser processing machine can output CO ₂ laser light at a maximum of 30 W. The spot diameter can be set to tens to hundreds of micrometers. In addition, this laser processing machine can control the output of laser light to 0 to 100% and can continuously vary the scanning speed of laser light.

Next, another glaze is attached to the surface of the two-dimensional code-attached tile 1 on which the plurality of minute recesses 4 are formed (step ST 6). Another glaze adhered in this step becomes the second glaze layer 7 of the tile 1 with the two-dimensional code shown in FIG. For this reason, another glaze uses a polishing material that becomes transparent after firing. This other glaze penetrates into the plurality of micro recesses 4.

Next, the tile 1 with the two-dimensional code to which the other glaze is adhered is fired at a temperature lower than the temperature of the main firing (for example, about 800 to 900 degrees) (step ST7). Preferably, the firing temperature at this time is equal to or lower than the temperature at which the first glaze layer 3 was fired.

When all of the above steps are completed, the tile 1 with the two-dimensional code shown in FIG. 1 is formed. The surface of the tile 1 with the two-dimensional code is substantially flattened by the transparent glaze layer 7.

As described above, the two-dimensional code-added tile 1 according to the first embodiment is placed on the ground or the like in a state where the two-dimensional code pattern part 5 is exposed. The tile 1 with a two-dimensional code according to the first embodiment has a two-dimensional code by exposing the exposed two-dimensional code pattern portion 5 with a general-purpose device such as a camera-equipped mobile phone terminal 31. Digital data encoded in the pattern unit 5 can be provided.

As in the first embodiment, in the base material 2 on which the first glaze layer 3 is formed, the minute recesses 4 penetrating the first glaze layer 3 are formed by laser processing. Compared to the case where the concave portion is formed in the material 2 by laser processing, the difference in the distinctive color can be easily formed by a general-purpose device such as the mobile phone terminal 31 with a camera. Laser processing on substrate 2 When the concave portion is formed by the method, the two-dimensional code pattern portion 5 is formed only by the difference in brightness, so that the concave portion needs to be formed deeply. In addition, even if such a deep recess is formed, if light is shining from directly above the two-dimensional code pattern portion 5, a general-purpose device such as a cellular phone terminal 31 with a camera may be used. It is difficult to secure a color difference that can be identified.

In the first embodiment, a two-dimensional code pattern portion 5 is formed using a base material 2 made of a material used for ceramics. In this case, for example, the durability is better than when the base material 2 is formed of a heat-resistant plastic or the like. As a result, even if the tile 1 with the two-dimensional code of the first embodiment is installed in a state of being exposed to wind and rain on a semi-permanent structure such as a pavement, a building, etc., for a long time, The two-dimensional code of the two-dimensional code pattern part 5 can be extracted and decoded.

In the first embodiment, a two-dimensional code pattern portion 5 is formed on a base material 2 and a first glaze layer 3 made of a material used for ceramics by laser processing. As a result, in sandblasting, for example, in the case of square tiles, images are taken with a general-purpose device such as a camera-equipped mobile phone terminal 31 on a tile whose side is 2 cm or more and 12 cm or less. It is not possible to form the two-dimensional code pattern part 5 with the accuracy that can be decoded. On the other hand, in the first embodiment, a two-dimensional code pattern with such accuracy that a small-sized tile can be imaged and decoded by a general-purpose device such as a camera-equipped mobile phone terminal 31 is used. Part 5 can be formed.

In the first embodiment, the two-dimensional code pattern unit 5 is realized as a combination of white and black. In addition to this, for example, the two-dimensional code pattern part 5 may be a combination of red and black, It may be a combination of color and white, a combination of blue and white, or a combination of colors of the same hue having different lightness or saturation.

Embodiment 2

FIG. 8 is a diagram showing a tile 41 with a two-dimensional code according to Embodiment 2 of the present invention. FIG. 8 (A) is a front view of the tile 41 with a two-dimensional code. FIG. 8 (B) is a side view of the tile 41 with a two-dimensional code. FIG. 8 (C) is a cross-sectional view of the tile 41 with the two-dimensional code taken along line AA. The tile 41 with a two-dimensional code according to the second embodiment of the present invention is different from the tile 41 with a two-dimensional code according to the first embodiment in that the glaze layer has four layers.

The tile 41 with a two-dimensional code has a base material 42. The material used for the base material 42 is the same as the base material 2 of the first embodiment.

On the surface of the base material 42, a first glaze layer 43 is formed. The first glaze layer 43 is formed white and has a thickness of 10 micrometers. A second glaze layer 44 is formed on the first glaze layer 43. The second glaze layer 44 is formed to be blue and 10 micrometer thick. A third glaze layer 45 is formed on the second glaze layer 44. The third glaze layer 45 is formed in black with a thickness of 10 micrometer. On the third glaze layer 45, a fourth glaze layer 46 is formed. The fourth glaze layer 46 is formed in blue and has a thickness of 10 micrometers. The materials used for the first glaze layer 43, the second glaze layer 44, the third glaze layer 45, and the fourth glaze layer 46 are basically the same as those of the first embodiment. It is similar to glaze layer 4 3.

These four glaze layers 4 3, 4 4, 4 5, 4 6 can be formed, for example, by stacking four transfer papers on the base material 4 and firing them together. Wear. By stacking the transfer papers to which the glaze adheres and firing them together, multiple glaze layers can be fired on the substrate 42 in a single firing step, reducing the number of firings. Can be. When firing a plurality of glaze layers in a single firing step using transfer paper, the number of transfer papers that can be fired simultaneously should be four or less. When the number of transfer papers is 5 or more, the glazes of the transfer papers become easier to mix during firing, and the boundary between the glaze layers becomes less sticky. If the boundary between the glaze layers is not clear, the margin of the depth of the minute concave portion 47 will be reduced by that much when the minute concave portion 47 is formed thereafter.

On the surface side of the base material 42, the first glaze layer 43, the second glaze layer 44, the third glaze layer 45, and the fourth glaze layer 46, a plurality of minute recesses 4 are provided. 7 is formed. The minute concave portion 47 is formed at least to a depth penetrating the fourth glaze layer 46. The fourth glaze layer 46 is the glaze layer on the outermost surface side of the two-dimensional code tile 41. That is, a certain minute concave portion 47 penetrates the fourth blue glaze layer 46 of blue and exposes the third glaze layer 45 of black. One minute recess 47 penetrates through the fourth glaze layer 46 and the third glaze layer 45 to expose the blue second glaze layer 44. There is a small concave portion 47, the fourth glaze layer 46, the third glaze layer 45 and the second glaze layer 44 penetrate the white first glaze layer 43 is exposed. The remaining minute recesses 4 7 penetrate the fourth glaze layer 46, the third glaze layer 45, the second glaze layer 44, and the first glaze layer 43, and the black base material 42 is formed. To expose.

It should be noted that such a minute concave portion 47 having a plurality of different depths can be formed by changing the settings of the laser beam output, the laser beam scanning speed, and the like in the above-described laser beam machine. For example, in the laser beam machine described above, the output power of the laser beam is 100%, and the scanning speed of the laser beam is When the number of pulses per inch length is set to 800 pulses per second, and the number of pulses per inch length is set to 800 pulses, the first white glaze layer 43 is exposed. When the output power of the laser beam is set to 100%, the scanning speed of the laser beam is set to 30 millimeters per second, and the number of pulses per inch length is set to 800 pulses, the blue second glaze layer 4 4 is exposed. When the output power of the laser beam is set to 25%, the scanning speed of the laser beam is set to 80 millimeters per second, and the number of pulses per inch length is set to 800 pulses, the black third glaze layer 4 5 is exposed.

By forming a plurality of micro oil portions 47 having a plurality of depths in this way, a two-dimensional code pattern portion 48 is realized at the center of the surface of the tile 41 with a two-dimensional code. . Around the two-dimensional code pattern portion 48, a surrounding character portion 49 is formed along four sides. The two-dimensional code pattern section 48. is captured by a general-purpose device such as a cellular phone terminal 31 with a camera, and the two-dimensional code extracted from the captured image is decoded to obtain a two-dimensional code pattern. The data coded in the pattern section 48 can be used.

In the second embodiment, the four glaze layers are a combination of white, blue, and black indigo colors. In addition, for example, the four glaze layers are green, blue, and red. And a combination of white and white.

In addition, by using two or more glaze layers in this manner, two or more two-dimensional codes can be encoded into one two-dimensional code pattern part 48 so that they can be decoded independently of each other. . For example, the two-dimensional code pattern part 48 is formed in three colors of black, white, and blue, and one camera-equipped mobile phone terminal 31 extracts two-dimensional codes by treating black and blue as the same color. Then, another camera-equipped mobile phone terminal 31 can extract two-dimensional codes by treating white and blue as the same color. The terminal 31 can decode different two-dimensional codes from the same two-dimensional code-added tile. In addition, in one camera-equipped mobile phone terminal 31, a plurality of patterns for handling these colors are prepared in a program or the like, and one of these patterns is selected for decoding. May be.

As described above, the tile 1 with a two-dimensional code according to Embodiment 1 described above has a substantially plate-shaped base material 2 formed of a ceramic material and a glaze on the surface of the fired base material 2. The first glaze layer 3 is formed by attaching and firing, and is formed in a different color from the base material 2, and the first glaze layer 3 is formed to penetrate the two-dimensional code pattern portion 5. And a plurality of minute concave portions 4 to be formed. Further, the tile 41 with a two-dimensional code according to Embodiment 2 described above has a substantially plate-shaped base material 42 formed of a ceramic material, and a glaze on the surface after firing the base material 42. Four glaze layers 4 3, 4 4, 4 5, 4 6, which are formed by attaching and firing, are formed in a different color from the base material 42, and have different colors from each other, and four glaze layers A plurality of micro-recesses formed through at least one glaze layer (fourth glaze layer 46) of 43, 44, 45, 46 to form a two-dimensional code pattern part 48. 4 7 and

Therefore, the two-dimensional code-attached tiles 1 and 41 according to each of the embodiments have a small thickness of the glaze layers 3, 43, 44, 45, and 46 laminated on the base materials 2 and 42. The depth of the small recesses 4 and 47 formed in the glaze layers 3, 43, 44, 45 and 46 is shallow. The depth of the minute recesses 4 of the first embodiment is about 20 micrometers, and the depth of the minute recesses 47 of the second embodiment is about 40 micrometers. As a result, the two-dimensional code pattern portions 5, 48 of the two-dimensional code-added tiles 1, 41 according to each embodiment are formed with high accuracy. In the first embodiment, the height from the base material 2, 42 exposed by the minute concave portion 47 to the surface of the glaze layers 3, 46 is about 20 microphones. In the second embodiment, the diameter is about 40 micrometers. Therefore, the surfaces of the tiles 1 and 41 with the two-dimensional code can be regarded as being in a single plane.

As a result, the two-dimensional code pattern section 48 can be imaged and decoded by a general-purpose device such as a camera-equipped mobile phone terminal 31. If the irregularities of the two-dimensional code pattern portion 48 become several hundred micrometers, the surface becomes non-planar. Therefore, the glaze layer is preferably formed to a thickness of less than 100 micrometers. In the tile 1 with a two-dimensional code according to Embodiment 1 described above, the transparent second glaze layer 7 is formed on the first glaze layer 3. The transparent second glaze layer 7 is formed by firing the first glaze layer 3 on the base material 2 and then applying and firing. Therefore, the glaze of the second glaze layer 7 penetrates into the plurality of minute recesses 4 and the surface of the tile 1 with the two-dimensional code becomes flat.

Therefore, in the tile 1 with a two-dimensional code according to Embodiment 1 described above, the first glaze layer 3 is chipped or peeled off as compared with the case where the first glaze layer 3 is exposed as it is. This makes it difficult to maintain the two-dimensional code pattern unit 5 in a readable shape for a long time. The same effect can be expected even if a transparent glaze layer is formed on the fourth glaze layer 46 in the tile 41 with the two-dimensional code according to Embodiment 2 described above. be able to.

In the tile 1 with a two-dimensional code according to Embodiment 1 described above, a QR code is formed in the two-dimensional code pattern unit 5. In the tile 41 with a two-dimensional code according to Embodiment 2 described above, a QR code is formed in the two-dimensional code pattern part 48. QR codes consist of a combination of straight lines. Therefore, the two-dimensional code pattern parts 5 and 4 8 It can be formed by combining the linear minute concave portions 4 and 47 and the square minute concave portions 4 and 47. The linear minute recesses 4 and 47 and the square minute recesses 4 and 47 can easily form the contour of the minute recess by laser processing more accurately than, for example, forming a circular minute recess. In addition to the QR code, if it is a micro QR code, a PDF 417 code or a Data Matrix code, a linear minute recess

The two-dimensional code pattern portions 5, 48 can be formed by combining 4, 47 and the rectangular minute recesses 4, 47.

In the two-dimensional code-added tile 1 according to the first embodiment described above, characters are formed around the two-dimensional code pattern portion 5 along four sides. In the two-dimensional code-added tile 41 according to the second embodiment described above, characters are formed around the two-dimensional code pattern part 48 along four sides.

If characters are formed along the four sides around the two-dimensional code pattern parts 5, 48 in this way, for example, a two-dimensional code pattern can be formed on a general-purpose device such as a camera-equipped mobile phone terminal 31. When imaging the sections 5 and 48, the user of the apparatus reads the two-dimensional code pattern section so that characters or figures formed along the outer periphery of the two-dimensional code pattern section 5 and 48 can be read.

Position the device relative to 5, 48. Even if the user is not clearly conscious, the general-purpose device is positioned so that the characters around the two-dimensional code pattern section 48 can be seen at the same size without any discomfort.

As a result, a general-purpose device such as a camera-equipped mobile phone terminal 31 can be positioned almost directly above the two-dimensional code pattern portions 5, 48, even if the user of the device is not clearly conscious. Will be done. If a general-purpose device such as a camera-equipped mobile phone terminal 31 is positioned almost directly above the two-dimensional code pattern portions 5 and 48, the image of the two-dimensional code pattern portions 5 and 48 can be obtained. The image is the correct outline of the 2D code. The two-dimensional code having the correct outer shape can be easily extracted from the picked-up image and decoded by looking at the two-dimensional code having an outer shape such as a trapezoid in the picked-up image. Therefore, even if the user is unfamiliar, the two-dimensional code pattern parts 5, 48 are formed using a general-purpose device such as a camera-equipped mobile phone terminal 31. Code can be easily decoded.

Note that if characters are formed along at least two opposing sides of the two-dimensional code pattern section 48, a general-purpose device such as a camera-equipped mobile phone terminal 31 will require a user of the device. Even if the user is not clearly conscious, it can be expected that the two-dimensional code pattern portions 5, 48 are positioned almost directly above. Similar effects can be expected by forming figures and the like around the two-dimensional code pattern portions 5 and 48 instead of characters. Industrial applicability

The tile with a two-dimensional code according to the present invention is installed on a road or the like, for example, and the two-dimensional code can be decoded by a general-purpose device such as a mobile phone terminal with a camera.

Claims

The scope of the claims

1. A substantially plate-like base material made of a ceramic material,

A glaze layer formed by attaching a glaze to the surface after baking the base material and baking, and forming a color different from the base material;

A plurality of minute recesses formed through the glaze layer to form a two-dimensional code pattern portion;

A two-dimensional code-added tile, characterized by having:

2. Substantially plate-shaped base material made of ceramic material,

After the base material is fired, a glaze is applied to the surface and fired to form a layer with a thickness of 10 micrometers or more and 100 micrometers or less. A glaze layer to be formed,

A two-dimensional code-added tile, characterized by having:

3. Substantially plate-shaped substrate made of ceramic material,

A plurality of glaze layers formed by attaching a glaze to the surface after baking the base material and baking, and having a color different from the base material and different from each other;

A plurality of minute recesses formed through at least one of the plurality of glaze layers to form a two-dimensional code pattern portion;

A tile with a two-dimensional code, characterized by having:

4. Substantially plate-shaped substrate made of ceramic material, After the base material has been fired, a glaze is attached to the surface and fired to form a thickness of 10 to 100 micrometers, and a color different from that of the base material. And a plurality of glaze layers of different colors,

A two-dimensional code-added tile, characterized by having: ·

5. The base material has a square shape with a side of 2 cm or more and 12 cm or less,

The micro concave portion is formed on the surface of the base material after the glaze layer or the plurality of glaze layers are formed by firing by laser processing.

The tile with a two-dimensional code according to any one of claims 1 to 4, characterized in that:

6. On the outermost surface, there is another glaze layer formed by attaching a transparent glaze and firing.

6. The tile with a two-dimensional code according to claim 5, wherein:

7. The two-dimensional code formed in the two-dimensional code pattern portion is a QR code, a micro QR code, a code of PDF 4 17, a code of D a t a M a t r ix,

The two-dimensional code-attached tile according to any one of claims 1 to 4, characterized in that:

8. The base material is formed of a ceramic material which becomes black after firing, The tile with a two-dimensional code according to any one of claims 1 to 4, wherein the glaze layer is formed of a material that becomes white after firing.

9. Characters or figures are formed around the two-dimensional code pattern at least along two opposing sides of the outer periphery of the two-dimensional code pattern.

10. A step of applying a glaze of a different color from the base material on a substantially plate-shaped base material formed of a ceramic material;

Baking after the attaching step;

Irradiating a laser beam so as to form a two-dimensional code pattern portion, and forming a plurality of minute concave portions penetrating the layer by the glaze;

A method for manufacturing a tile with a two-dimensional code, comprising:

11. A process of applying a plurality of glazes of different colors and different colors from the base material on a substantially plate-shaped base material formed of a ceramic material;

Baking after the attaching step;

Irradiating a laser beam so as to form a two-dimensional code pattern portion, and forming a plurality of minute concave portions penetrating at least one glaze layer among the plurality of glaze layers;

A method for producing a tile with a two-dimensional code, characterized by having:

1 2. After the step of forming the plurality of minute recesses, the A process of applying a transparent glaze,

Baking after the step of attaching the transparent glaze,

12. The method for producing a tile with a two-dimensional code according to claim 10 or 11, wherein the tile has a two-dimensional code.