CN106295756B - Magnetic particle-based barcode, two-dimensional code and preparation method thereof - Google Patents

Abstract

A magnetic particle-based barcode, a two-dimensional code and a preparation method thereof relate to the field of barcode and two-dimensional code production. The magnetic particle-based barcode and two-dimensional code include a base material, a magnetic particle barcode, and a two-dimensional code pattern layer. Barcodes and two-dimensional codes based on magnetic particles are prepared by the magnetic field patterning method, and have the characteristics of simple operation, green and pollution-free.

Description

Magnetic particle-based barcode, two-dimensional code and preparation method thereof

technical field

The invention relates to the field of barcode and two-dimensional code production, in particular to a magnetic particle-based barcode, two-dimensional code and a preparation method thereof.

Background technique

As a high-capacity information storage, transmission and identification technology, barcode and two-dimensional code have attracted the attention of many countries in the world since their birth. The United States, Germany, Japan and other countries not only apply barcode and QR code technology to the management of various documents by public security, foreign affairs, military and other departments, but also apply it to customs, taxation and other departments for various reports and bills. Management, the management of goods and goods transportation by commerce, transportation and other departments, the management of postal parcels by the postal department, and the automation management of industrial production lines in the field of industrial production.

my country's research on barcode and two-dimensional code technology began in 1993. At present, bar code and two-dimensional code technology have been applied in my country's auto industry automated production lines, medical emergency service cards, foreign-related patents and case charges, jewelry and gemstone jewelry management, highway toll management and bank drafts.

In recent years, barcode and QR code applications have begun to enter the field of open circulation. In logistics labels, barcodes have been used to indicate information such as the place of origin and the address of delivery. The Packaging Technology Committee of the International Organization for Standardization has proposed a 2D barcode standard for packaging labels, and the International Article Numbering Association has put forward a standardized 2D barcode application specification in the EAN·UCC specification, indicating that the application of 2D barcode in the open logistics supply chain process needs to be used. It has been clear that the application of 2D barcode technology is developing from a single, partial and closed system application in the past to an open, globalized and standardized large-scale application system.

With the continuous improvement of the level of social informatization and the rapid development of automatic identification and data collection technologies such as two-dimensional barcodes, the trend of integration and mutual penetration of two-dimensional barcode technology and other technologies has become more and more obvious in recent years.

Today's barcode and two-dimensional code production technologies are all printing technologies, which require post-processing of the ink at high temperature. Two-dimensional codes and barcodes cannot be printed on substrates that are not resistant to high temperature. Therefore, developing a method with wide applicability to substrates is a core issue in this field.

The method of making patterns using magnetic fields has been widely used in scientific research. As a clean and efficient tool, magnetic fields can induce magnetic particles to form patterns in the magnetic field under the action of magnetic field modulators. The magnetic field modulator is composed of high permeability material and low permeability material. As shown in Figure 1, when the magnetic field passes through the high-permeability material in the vertical direction, the magnetic field tends to pass through the interior of the material, resulting in an increase in the magnetic flux density near the surface of the high-permeability material in the vertical direction , while the magnetic flux density in the region near the surface of the high-permeability material decreases in the horizontal direction. Similarly, when a magnetic field passes through a low-permeability material in a vertical direction, the magnetic field tends to bypass the material and pass through the outside of the material, resulting in a decrease in the magnetic flux density in the area near the surface of the low-permeability material in the vertical direction. is small, and the magnetic flux density in the region near the surface of the low-permeability material in the horizontal direction increases.

Simply arranging high-permeability materials and low-permeability materials alternately and placing them in a magnetic field can change the magnetic flux density gradient of the magnetic field. A magnetic field modulator consisting of high-permeability material iron foil (300μm thick) and low-permeability material aluminum foil (300μm thick) is placed in a uniform magnetic field with a magnetic flux density of 20mT, which modulates the magnetic field in the magnetic field. The magnetic flux density distribution of the 100 μm plane in the vertical direction of the surface of the device is shown in Figure 2. If the surface of the magnetic field modulator is designed with a bar code or two-dimensional code pattern, the pattern is made of materials with high magnetic permeability. After the magnetic field modulator is placed in the vertical magnetic field, an area where the magnetic flux density gradient of the barcode and two-dimensional code pattern changes will appear in the magnetic field, as shown in Figure 3.

都是常数，可以用

来反应磁场力，磁场力的大小主要和磁场磁通密度的梯度有关。所以磁场中加入的磁性粒子最终都会在磁场力的作用下，沉积到存在磁通密度梯度变化的区域。由于磁场调制器对磁场特殊的调制作用，可以在磁场中形成条形码、二维码图案形状的存在磁通密度变化的区域，在磁场力的作用下磁性粒子最终沉积到条形码、二维码图案的区域，这样就形成了基于磁性粒子的条形码、二维码的图案，如图4所示。图中箭头代表了磁性粒子收到的磁场力的方向，可见磁性粒子都会向高磁导率材料上方的区域沉积，最终形成磁性粒子的图案。在图4中，可见磁通密度分布呈现梯度变化，在高磁导率材料的上表面一定高度范围磁通密度增大，低磁导率材料上表面一定高度范围磁通密度减小。从磁场中不同位置磁性粒子所受到的磁力的分布图可见，在磁通密度的梯度变化大的区域磁力较大，而在磁通密度梯度变化小的区域磁力较小。即在高磁导率材料的上表面一定高度范围内磁性粒子收到的磁场力较小，而在低磁导率材料的上表面一定高度范围内磁性粒子收到的磁场力较大。所以在低磁导率材料表面一定高度范围内的磁性粒子将在磁场力的驱动下向着两边的高磁导率材料区域移动，最终磁性粒子都会沉积在高磁导率材料的表面。Magnetic particles are mainly affected by the magnetic force in the magnetic field

are constants, you can use

To reflect the magnetic field force, the magnitude of the magnetic field force is mainly related to the gradient of the magnetic flux density of the magnetic field. Therefore, the magnetic particles added to the magnetic field will eventually be deposited in the region where the magnetic flux density gradient changes under the action of the magnetic field force. Due to the special modulation effect of the magnetic field modulator on the magnetic field, it is possible to form a region where the magnetic flux density changes in the shape of the barcode and two-dimensional code pattern in the magnetic field. Under the action of the magnetic force, the magnetic particles are finally deposited on the barcode and two-dimensional code pattern. In this way, the pattern of barcode and two-dimensional code based on magnetic particles is formed, as shown in Figure 4. The arrows in the figure represent the direction of the magnetic field force received by the magnetic particles. It can be seen that the magnetic particles will deposit to the area above the high magnetic permeability material, and finally form the pattern of the magnetic particles. In Figure 4, it can be seen that the magnetic flux density distribution presents a gradient change, the magnetic flux density increases in a certain height range on the upper surface of the high magnetic permeability material, and the magnetic flux density decreases in a certain height range on the upper surface of the low magnetic permeability material. It can be seen from the distribution diagram of the magnetic force received by the magnetic particles at different positions in the magnetic field that the magnetic force is larger in the region where the gradient of the magnetic flux density changes greatly, while the magnetic force is smaller in the region with a small change of the magnetic flux density gradient. That is, the magnetic field force received by the magnetic particles within a certain height range of the upper surface of the high magnetic permeability material is small, while the magnetic field force received by the magnetic particles within a certain height range of the upper surface of the low magnetic permeability material is larger. Therefore, the magnetic particles within a certain height range on the surface of the low-permeability material will move to the high-permeability material regions on both sides under the drive of the magnetic field force, and eventually the magnetic particles will be deposited on the surface of the high-permeability material.

The invention utilizes a magnetic field modulator to form an area with a barcode and a two-dimensional code pattern in a magnetic field, and finally deposits magnetic particles into the area to form a barcode and two-dimensional code pattern. The method is simple, efficient, environmentally friendly, low in cost, widely applicable to substrates, and has great application potential in the field of barcode and two-dimensional code printing.

SUMMARY OF THE INVENTION

The invention relates to a magnetic particle-based bar code, a two-dimensional code and a manufacturing method thereof.

A bar code and two-dimensional code based on magnetic particles are mainly composed of a base material, a bar code of magnetic particles, a two-dimensional code pattern layer and a protective film layer.

Preferably, the substrate is: metal film, glass, paper, polymer film or other inorganic non-metallic material films.

Preferably, the magnetic particles are Fe-based magnetic particles, Co-based magnetic particles, Ni-based magnetic particles, alloy magnetic particles and ferrite magnetic particles, ferrite tetroxide-coated or ferrite-coated with a core-shell structure Magnetic particles or mixtures thereof.

Preferably, it is characterized in that the protective film is a metal film, glass, paper, polymer film or other inorganic non-metallic material film.

Preferably, a magnetic field modulator with a pattern on the surface is placed in a magnetic field, and the magnetic particles are deposited into patterns of barcodes and two-dimensional codes under the induction of the modulated magnetic field.

A method for making a bar code and a two-dimensional code based on magnetic particles, which mainly comprises the following steps:

Put the magnetic field modulator with barcode and two-dimensional code pattern on the surface into the magnetic field, place the substrate on the surface of the modulator, add magnetic particles on the surface of the substrate, and the magnetic particles form a surface pattern with the magnetic field modulator under the induction of the magnetic field. For the same pattern, the barcode and QR code pattern is pressed, and the surface of the pattern is covered with a protective film.

A magnetic field modulator, characterized in that it comprises a main body with pattern grooves or channels on its upper surface and a filling material filled in the pattern grooves or channels;

When the main body is a low magnetic permeability material, the filling material is a high magnetic permeability material; when the main body is a high magnetic permeability material, the filling material is a low magnetic permeability material; the heights here are relative, that is, the main body and the filling material It is sufficient to have different permeability.

Further, the high magnetic permeability material is iron, cobalt, nickel, low carbon steel, iron-based alloy, cobalt-based alloy, nickel-based alloy, soft ferrite, various soft magnetic alloys, various soft magnetic composite materials or one of them. species or a mixture of several.

Further, the low-permeability substance is one or a mixture of low-permeability metals, ceramics, thermosetting polymer materials, or (meth)acrylic acid, (meth)acrylate resins, or monomers.

Preferably, the magnetic particles are Fe-based magnetic particles, Co-based magnetic particles, Ni-based magnetic particles, alloy magnetic particles, ferrite magnetic particles, Fe-iron tetroxide-coated magnetic particles with core-shell structure or a mixed system thereof.

Preferably, the substrate is a metal film, glass, paper, polymer film or other inorganic non-metallic material films.

Preferably, the magnetic field modulator is placed at a position where the magnetic flux density in the magnetic field is greater than 0.5 mT. ,

Preferably, it is characterized in that the protective film is a metal film, glass, paper, polymer film or other inorganic non-metallic material film.

Description of drawings

Fig. 1 is a schematic diagram of the effect of high-permeability substances and low-permeability substances on the vertical magnetic field;

Figure 2 is the magnetic flux density distribution diagram 100μm above the surface of the magnetic field modulator composed of alternately composed of iron foils and aluminum foils with a thickness of 300μm in a uniform magnetic field of 20mT;

Figure 3 is a diagram of the magnetic flux distribution at 100 μm above the surface of a magnetic field modulator with a bar code pattern in a 20 mT uniform magnetic field.

Figure 4 is a schematic diagram of the mechanism of magnetic flux density gradient capturing magnetic particles to form patterns;

5 is a schematic diagram of an implementation example of a method for making a magnetic particle-based barcode and a two-dimensional code in the present invention;

Figure 6 is a diagram of the magnetic flux distribution at 100 μm above the surface of the magnetic field modulator with a two-dimensional code pattern on the surface in a 20 mT uniform magnetic field.

Detailed ways

In order to make the objectives, technical solutions and advantages of the present invention clearer, the embodiments of the present invention will be further described in detail below with reference to the accompanying drawings. Those skilled in the art can easily understand other advantages and functions of the present invention from the content disclosed in this specification. The present invention may also be practiced or applied in other and different embodiments.

The above and other technical features and beneficial effects will be described in detail with reference to the embodiments and the accompanying drawings.

Example 1

The magnetic field modulator in this embodiment is shown in FIG. 3 , and the magnetic field modulator is composed of low-permeability material plastic and high-permeability material iron. The plastic constitutes the main structure of the magnetic field modulator, the grooves with barcode patterns are pre-designed on the upper surface of the main structure, and iron powder is filled in the grooves. A suspension of iron nanoparticles and ethanol was prepared, wherein the mass fraction of iron nanoparticles was 3‰. The magnetic field modulator is placed in a uniform magnetic field of 20 mT, the direction of the magnetic field is vertically upward, and the upper surface of the magnetic field modulator is perpendicular to the direction of the magnetic field. Place the base material polyimide film on the upper surface of the magnetic field modulator, add the suspension of iron nanoparticles and ethanol to the base material by dropping, the magnetic particles in the suspension will be deposited under the induction of the magnetic field, A barcode pattern consistent with the upper surface of the magnetic field modulator is formed, as shown in Figure 5. Finally, the pattern is pressed with a glass skin and covered with a layer of PET film as a protective film.

Embodiment 2

The magnetic field modulator in this embodiment is shown in FIG. 3 , and the magnetic field modulator is composed of low magnetic permeability material plastic and high magnetic permeability material triiron tetroxide. The plastic constitutes the main structure of the magnetic field modulator, the grooves with barcode patterns are pre-designed on the upper surface of the main structure, and the ferric oxide powder is filled in the grooves. A suspension of iron nanoparticles and ethanol was prepared, wherein the mass fraction of iron nanoparticles was 3‰. The magnetic field modulator is placed in a uniform magnetic field of 20 mT, the direction of the magnetic field is vertically upward, and the upper surface of the magnetic field modulator is perpendicular to the direction of the magnetic field. Place the base material polyimide film on the upper surface of the magnetic field modulator, add the suspension of iron nanoparticles and ethanol to the base material by dropping, the magnetic particles in the suspension will be deposited under the induction of the magnetic field, A barcode pattern consistent with the upper surface of the magnetic field modulator is formed, as shown in Figure 5. Finally, the pattern is pressed with a glass skin and covered with a layer of PET film as a protective film.

Embodiment 3

The magnetic field modulator in this embodiment is shown in FIG. 3 , and the magnetic field modulator is composed of low-permeability material plastic and high-permeability material nickel. The plastic constitutes the main structure of the magnetic field modulator, the grooves with barcode patterns are pre-designed on the upper surface of the main structure, and nickel powder is filled in the grooves. A suspension of iron nanoparticles and ethanol was prepared, wherein the mass fraction of iron nanoparticles was 3‰. The magnetic field modulator is placed in a uniform magnetic field of 20 mT, the direction of the magnetic field is vertically upward, and the upper surface of the magnetic field modulator is perpendicular to the direction of the magnetic field. Place the base material polyimide film on the upper surface of the magnetic field modulator, add the suspension of iron nanoparticles and ethanol to the base material by dropping, the magnetic particles in the suspension will be deposited under the induction of the magnetic field, A barcode pattern consistent with the upper surface of the magnetic field modulator is formed, as shown in Figure 5. Finally, the pattern is pressed with a glass skin and covered with a layer of PET film as a protective film.

Embodiment 4

The magnetic field modulator in this embodiment is shown in FIG. 3 , and the magnetic field modulator is composed of low magnetic permeability material plastic and high magnetic permeability material cobalt. The plastic constitutes the main structure of the magnetic field modulator, the grooves with barcode patterns are pre-designed on the upper surface of the main structure, and the cobalt powder is filled in the grooves. A suspension of iron nanoparticles and ethanol was prepared, wherein the mass fraction of iron nanoparticles was 3‰. The magnetic field modulator is placed in a uniform magnetic field of 20 mT, the direction of the magnetic field is vertically upward, and the upper surface of the magnetic field modulator is perpendicular to the direction of the magnetic field. Place the base material polyimide film on the upper surface of the magnetic field modulator, add the suspension of iron nanoparticles and ethanol to the base material by dropping, the magnetic particles in the suspension will be deposited under the induction of the magnetic field, A barcode pattern consistent with the upper surface of the magnetic field modulator is formed, as shown in Figure 5. Finally, the pattern is pressed with a glass skin and covered with a layer of PET film as a protective film.

Embodiment 5

The magnetic field modulator in this embodiment is shown in FIG. 3 , and the magnetic field modulator is composed of low magnetic permeability material plastic and high magnetic permeability material iron and cobalt. The plastic constitutes the main structure of the magnetic field modulator, the grooves with barcode patterns are pre-designed on the upper surface of the main structure, and the mixed powder of iron powder and cobalt powder with a mass ratio of 1:1 is filled in the grooves. A suspension of iron nanoparticles and ethanol was prepared, wherein the mass fraction of iron nanoparticles was 3‰. The magnetic field modulator is placed in a uniform magnetic field of 20 mT, the direction of the magnetic field is vertically upward, and the upper surface of the magnetic field modulator is perpendicular to the direction of the magnetic field. Place the base material polyimide film on the upper surface of the magnetic field modulator, add the suspension of iron nanoparticles and ethanol to the base material by dropping, the magnetic particles in the suspension will be deposited under the induction of the magnetic field, A barcode pattern consistent with the upper surface of the magnetic field modulator is formed, as shown in Figure 5. Finally, the pattern is pressed with a glass skin and covered with a layer of PET film as a protective film.

Embodiment 6

The magnetic field modulator in this embodiment is shown in FIG. 3 , and the magnetic field modulator is composed of low-permeability material plastic and high-permeability material iron and nickel. The plastic constitutes the main structure of the magnetic field modulator, the grooves with barcode patterns are pre-designed on the upper surface of the main structure, and the mixed powder of iron powder and nickel powder with a mass ratio of 2:1 is filled in the grooves. A suspension of iron nanoparticles and ethanol was prepared, wherein the mass fraction of iron nanoparticles was 3‰. The magnetic field modulator is placed in a uniform magnetic field of 20 mT, the direction of the magnetic field is vertically upward, and the upper surface of the magnetic field modulator is perpendicular to the direction of the magnetic field. Place the base material polyimide film on the upper surface of the magnetic field modulator, add the suspension of iron nanoparticles and ethanol to the base material by dropping, the magnetic particles in the suspension will be deposited under the induction of the magnetic field, A barcode pattern consistent with the upper surface of the magnetic field modulator is formed, as shown in Figure 5. Finally, the pattern is pressed with a glass skin and covered with a layer of PET film as a protective film.

Embodiment 7

The magnetic field modulator in this embodiment is shown in FIG. 3 , and the magnetic field modulator is composed of low-permeability material plastic and high-permeability material ferric oxide-coated graphene. The plastic constitutes the main structure of the magnetic field modulator, the grooves with barcode patterns are pre-designed on the upper surface of the main structure, and the graphene powder coated with ferric oxide is filled in the grooves. A suspension of iron nanoparticles and ethanol was prepared, wherein the mass fraction of iron nanoparticles was 3‰. The magnetic field modulator is placed in a uniform magnetic field of 20 mT, the direction of the magnetic field is vertically upward, and the upper surface of the magnetic field modulator is perpendicular to the direction of the magnetic field. Place the base material polyimide film on the upper surface of the magnetic field modulator, add the suspension of iron nanoparticles and ethanol to the base material by dropping, the magnetic particles in the suspension will be deposited under the induction of the magnetic field, A barcode pattern consistent with the upper surface of the magnetic field modulator is formed, as shown in Figure 5. Finally, the pattern is pressed with a glass skin and covered with a layer of PET film as a protective film.

Embodiment 8

The magnetic field modulator in this embodiment is shown in FIG. 3 , and the magnetic field modulator is composed of a low-permeability material plastic and a high-permeability material covered with ferroferric oxide graphene. The plastic constitutes the main structure of the magnetic field modulator, the grooves with barcode patterns are pre-designed on the upper surface of the main structure, and the graphene powder coated with ferric oxide is filled in the grooves. A suspension of iron nanoparticles and ethanol was prepared, wherein the mass fraction of iron nanoparticles was 3‰. The magnetic field modulator is placed in a uniform magnetic field of 20 mT, the direction of the magnetic field is vertically upward, and the upper surface of the magnetic field modulator is perpendicular to the direction of the magnetic field. Place the base material polyimide film on the upper surface of the magnetic field modulator, add the suspension of iron nanoparticles and ethanol to the base material by dropping, the magnetic particles in the suspension will be deposited under the induction of the magnetic field, A barcode pattern consistent with the upper surface of the magnetic field modulator is formed, as shown in Figure 5. Finally, the pattern is pressed with a glass skin and covered with a layer of PET film as a protective film.

Embodiment 9

The magnetic field modulator in this embodiment is shown in FIG. 3 , and the magnetic field modulator is composed of low-permeability material aluminum and high-permeability material iron. Aluminum constitutes the main structure of the magnetic field modulator. The grooves with barcode patterns are pre-designed on the upper surface of the main structure, and iron powder is filled in the grooves. A suspension of iron nanoparticles and ethanol was prepared, wherein the mass fraction of iron nanoparticles was 3‰. The magnetic field modulator is placed in a uniform magnetic field of 20 mT, the direction of the magnetic field is vertically upward, and the upper surface of the magnetic field modulator is perpendicular to the direction of the magnetic field. Place the base material polyimide film on the upper surface of the magnetic field modulator, add the suspension of iron nanoparticles and ethanol to the base material by dropping, the magnetic particles in the suspension will be deposited under the induction of the magnetic field, A barcode pattern consistent with the upper surface of the magnetic field modulator is formed, as shown in Figure 5. Finally, the pattern is pressed with a glass skin and covered with a layer of PET film as a protective film.

Embodiment ten

The magnetic field modulator in this embodiment is shown in FIG. 3 , and the magnetic field modulator is composed of low-permeability material copper and high-permeability material iron. Copper constitutes the main structure of the magnetic field modulator, grooves with barcode patterns are pre-designed on the upper surface of the main structure, and iron powder is filled in the grooves. A suspension of iron nanoparticles and ethanol was prepared, wherein the mass fraction of iron nanoparticles was 3‰. The magnetic field modulator is placed in a uniform magnetic field of 20 mT, the direction of the magnetic field is vertically upward, and the upper surface of the magnetic field modulator is perpendicular to the direction of the magnetic field. Place the base material polyimide film on the upper surface of the magnetic field modulator, add the suspension of iron nanoparticles and ethanol to the base material by dropping, the magnetic particles in the suspension will be deposited under the induction of the magnetic field, A barcode pattern consistent with the upper surface of the magnetic field modulator is formed, as shown in Figure 5. Finally, the pattern is pressed with a glass skin and covered with a layer of PET film as a protective film.

Embodiment 11

The magnetic field modulator in this embodiment is shown in FIG. 3 , and the magnetic field modulator is composed of low-permeability material plastic and high-permeability material iron. The plastic constitutes the main structure of the magnetic field modulator, the grooves with barcode patterns are pre-designed on the upper surface of the main structure, and iron powder is filled in the grooves. A suspension of iron nanoparticles and acetone was prepared, in which the mass fraction of iron nanoparticles was 3‰. The magnetic field modulator is placed in a uniform magnetic field of 20 mT, the direction of the magnetic field is vertically upward, and the upper surface of the magnetic field modulator is perpendicular to the direction of the magnetic field. Place the base material polyimide film on the upper surface of the magnetic field modulator, add the suspension of iron nanoparticles and ethanol to the base material by dropping, the magnetic particles in the suspension will be deposited under the induction of the magnetic field, A barcode pattern consistent with the upper surface of the magnetic field modulator is formed, as shown in Figure 5. Finally, the pattern is pressed with a glass skin and covered with a layer of PET film as a protective film.

Embodiment 12

The magnetic field modulator in this embodiment is shown in FIG. 3 , and the magnetic field modulator is composed of low-permeability material plastic and high-permeability material iron. The plastic constitutes the main structure of the magnetic field modulator, the grooves with barcode patterns are pre-designed on the upper surface of the main structure, and iron powder is filled in the grooves. A suspension of iron nanoparticles and water was prepared, wherein the mass fraction of iron nanoparticles was 3‰. The magnetic field modulator is placed in a uniform magnetic field of 20 mT, the direction of the magnetic field is vertically upward, and the upper surface of the magnetic field modulator is perpendicular to the direction of the magnetic field. Place the base material polyimide film on the upper surface of the magnetic field modulator, add the suspension of iron nanoparticles and ethanol to the base material by dropping, the magnetic particles in the suspension will be deposited under the induction of the magnetic field, A barcode pattern consistent with the upper surface of the magnetic field modulator is formed, as shown in Figure 5. Finally, the pattern is pressed with a glass skin and covered with a layer of PET film as a protective film.

Embodiment thirteen

The magnetic field modulator in this embodiment is shown in FIG. 3 , and the magnetic field modulator is composed of low-permeability material plastic and high-permeability material iron. The plastic constitutes the main structure of the magnetic field modulator, the grooves with barcode patterns are pre-designed on the upper surface of the main structure, and iron powder is filled in the grooves. A suspension of iron nanoparticles and ethanol was prepared, wherein the mass fraction of iron nanoparticles was 3‰. The magnetic field modulator is placed in a uniform magnetic field of 20 mT, the direction of the magnetic field is vertically upward, and the upper surface of the magnetic field modulator is perpendicular to the direction of the magnetic field. Place the substrate polyimide film on the upper surface of the magnetic field modulator, add a suspension of iron nanoparticles and ethanol to the substrate by spraying, and the magnetic particles in the suspension will be deposited under the induction of the magnetic field to form The barcode pattern consistent with the upper surface of the magnetic field modulator is shown in Figure 5. Finally, the pattern is pressed with a glass skin and covered with a layer of PET film as a protective film.

Embodiment 14

The magnetic field modulator in this embodiment is shown in FIG. 3 , and the magnetic field modulator is composed of low-permeability material plastic and high-permeability material iron. The plastic constitutes the main structure of the magnetic field modulator, the grooves with barcode patterns are pre-designed on the upper surface of the main structure, and iron powder is filled in the grooves. A suspension of iron nanoparticles and ethanol was prepared, wherein the mass fraction of iron nanoparticles was 3‰. The magnetic field modulator is placed in a uniform magnetic field of 20 mT, the direction of the magnetic field is vertically upward, and the upper surface of the magnetic field modulator is perpendicular to the direction of the magnetic field. Place the substrate polyimide film on the upper surface of the magnetic field modulator, pour the suspension slowly on the substrate, and the magnetic particles in the suspension will be deposited under the induction of the magnetic field, forming the upper surface of the magnetic field modulator A consistent barcode pattern, as shown in Figure 5. Finally, the pattern is pressed with a glass skin and covered with a layer of PET film as a protective film.

Embodiment fifteen

The magnetic field modulator in this embodiment is shown in FIG. 3 , and the magnetic field modulator is composed of low-permeability material plastic and high-permeability material iron. The plastic constitutes the main structure of the magnetic field modulator, the grooves with barcode patterns are pre-designed on the upper surface of the main structure, and iron powder is filled in the grooves. The magnetic field modulator is placed in a uniform magnetic field of 20 mT, the direction of the magnetic field is vertically upward, and the upper surface of the magnetic field modulator is perpendicular to the direction of the magnetic field. Place the substrate polyimide film on the upper surface of the magnetic field modulator, sprinkle iron nanoparticles on the substrate, and the magnetic particles will be deposited under the induction of the magnetic field to form a barcode pattern consistent with the upper surface of the magnetic field modulator, such as shown in Figure 5. Finally, the pattern is pressed with a glass skin and covered with a layer of PET film as a protective film.

Embodiment 16

The magnetic field modulator in this embodiment is shown in FIG. 3 , and the magnetic field modulator is composed of low-permeability material plastic and high-permeability material iron. The plastic constitutes the main structure of the magnetic field modulator, the grooves with barcode patterns are pre-designed on the upper surface of the main structure, and iron powder is filled in the grooves. The magnetic field modulator is placed in a uniform magnetic field of 20 mT, the direction of the magnetic field is vertically upward, and the upper surface of the magnetic field modulator is perpendicular to the direction of the magnetic field. A base polyimide film is placed on the upper surface of the magnetic field modulator. The magnetic particles are doped into the air, and the magnetic particles are added to the surface of the substrate by blowing air to the surface of the substrate. The magnetic particles will be deposited under the induction of the magnetic field to form a barcode pattern consistent with the upper surface of the magnetic field modulator. , as shown in Figure 5. Finally, the pattern is pressed with a glass skin and covered with a layer of PET film as a protective film.

Embodiment seventeen

The magnetic field modulator in this embodiment is shown in FIG. 3 , and the magnetic field modulator is composed of low-permeability material plastic and high-permeability material iron. The plastic constitutes the main structure of the magnetic field modulator, the grooves with barcode patterns are pre-designed on the upper surface of the main structure, and iron powder is filled in the grooves. A suspension of iron nanoparticles and ethanol was prepared, wherein the mass fraction of iron nanoparticles was 5‰. The magnetic field modulator is placed in a uniform magnetic field of 20 mT, the direction of the magnetic field is vertically upward, and the upper surface of the magnetic field modulator is perpendicular to the direction of the magnetic field. Place the base material polyimide film on the upper surface of the magnetic field modulator, add the suspension of iron nanoparticles and ethanol to the base material by dropping, the magnetic particles in the suspension will be deposited under the induction of the magnetic field, A barcode pattern consistent with the upper surface of the magnetic field modulator is formed, as shown in Figure 5. Finally, the pattern is pressed with a glass skin and covered with a layer of PET film as a protective film.

Embodiment 18

The magnetic field modulator in this embodiment is shown in FIG. 3 , and the magnetic field modulator is composed of low-permeability material plastic and high-permeability material iron. The plastic constitutes the main structure of the magnetic field modulator, the grooves with barcode patterns are pre-designed on the upper surface of the main structure, and iron powder is filled in the grooves. A suspension of iron nanoparticles and ethanol was prepared, wherein the mass fraction of iron nanoparticles was 1%. The magnetic field modulator is placed in a uniform magnetic field of 20 mT, the direction of the magnetic field is vertically upward, and the upper surface of the magnetic field modulator is perpendicular to the direction of the magnetic field. Place the base material polyimide film on the upper surface of the magnetic field modulator, add the suspension of iron nanoparticles and ethanol to the base material by dropping, the magnetic particles in the suspension will be deposited under the induction of the magnetic field, A barcode pattern consistent with the upper surface of the magnetic field modulator is formed, as shown in Figure 5. Finally, the pattern is pressed with a glass skin and covered with a layer of PET film as a protective film.

Example 19

The magnetic field modulator in this embodiment is shown in FIG. 3 , and the magnetic field modulator is composed of low-permeability material plastic and high-permeability material iron. The plastic constitutes the main structure of the magnetic field modulator, the grooves with barcode patterns are pre-designed on the upper surface of the main structure, and iron powder is filled in the grooves. A suspension of iron nanoparticles and ethanol was prepared, wherein the mass fraction of iron nanoparticles was 5%. The magnetic field modulator is placed in a uniform magnetic field of 20 mT, the direction of the magnetic field is vertically upward, and the upper surface of the magnetic field modulator is perpendicular to the direction of the magnetic field. Place the base material polyimide film on the upper surface of the magnetic field modulator, add the suspension of iron nanoparticles and ethanol to the base material by dropping, the magnetic particles in the suspension will be deposited under the induction of the magnetic field, A barcode pattern consistent with the upper surface of the magnetic field modulator is formed, as shown in Figure 5. Finally, the pattern is pressed with a glass skin and covered with a layer of PET film as a protective film.

Embodiment 20

The magnetic field modulator in this embodiment is shown in FIG. 3 , and the magnetic field modulator is composed of low-permeability material plastic and high-permeability material iron. The plastic constitutes the main structure of the magnetic field modulator, the grooves with barcode patterns are pre-designed on the upper surface of the main structure, and iron powder is filled in the grooves. A suspension of iron nanoparticles and ethanol was prepared, wherein the mass fraction of iron nanoparticles was 3‰. The magnetic field modulator is placed in a uniform magnetic field of 10 mT, the direction of the magnetic field is vertically upward, and the upper surface of the magnetic field modulator is perpendicular to the direction of the magnetic field. Place the base material polyimide film on the upper surface of the magnetic field modulator, add the suspension of iron nanoparticles and ethanol to the base material by dropping, the magnetic particles in the suspension will be deposited under the induction of the magnetic field, A barcode pattern consistent with the upper surface of the magnetic field modulator is formed, as shown in Figure 5. Finally, the pattern is pressed with a glass skin and covered with a layer of PET film as a protective film.

Example 21

The magnetic field modulator in this embodiment is shown in FIG. 3 , and the magnetic field modulator is composed of low-permeability material plastic and high-permeability material iron. The plastic constitutes the main structure of the magnetic field modulator, the grooves with barcode patterns are pre-designed on the upper surface of the main structure, and iron powder is filled in the grooves. A suspension of iron nanoparticles and ethanol was prepared, wherein the mass fraction of iron nanoparticles was 3‰. The magnetic field modulator is placed in a uniform magnetic field of 5 mT, the direction of the magnetic field is vertically upward, and the upper surface of the magnetic field modulator is perpendicular to the direction of the magnetic field. Place the base material polyimide film on the upper surface of the magnetic field modulator, add the suspension of iron nanoparticles and ethanol to the base material by dropping, the magnetic particles in the suspension will be deposited under the induction of the magnetic field, A barcode pattern consistent with the upper surface of the magnetic field modulator is formed, as shown in Figure 5. Finally, the pattern is pressed with a glass skin and covered with a layer of PET film as a protective film.

Embodiment 22

The magnetic field modulator in this embodiment is shown in FIG. 3 , and the magnetic field modulator is composed of low-permeability material plastic and high-permeability material iron. The plastic constitutes the main structure of the magnetic field modulator, the grooves with barcode patterns are pre-designed on the upper surface of the main structure, and iron powder is filled in the grooves. A suspension of iron nanoparticles and ethanol was prepared, wherein the mass fraction of iron nanoparticles was 3‰. The magnetic field modulator is placed in a uniform magnetic field of 5 mT, the direction of the magnetic field is vertically upward, and the upper surface of the magnetic field modulator is perpendicular to the direction of the magnetic field. Place the base material polyimide film on the upper surface of the magnetic field modulator, add the suspension of iron nanoparticles and ethanol to the base material by dropping, the magnetic particles in the suspension will be deposited under the induction of the magnetic field, A barcode pattern consistent with the upper surface of the magnetic field modulator is formed, as shown in Figure 5. Finally, the pattern is pressed with a glass skin and covered with a layer of PET film as a protective film.

Embodiment 23

The magnetic field modulator in this embodiment is shown in FIG. 3 , and the magnetic field modulator is composed of low-permeability material plastic and high-permeability material iron. The plastic constitutes the main structure of the magnetic field modulator, the grooves with barcode patterns are pre-designed on the upper surface of the main structure, and iron powder is filled in the grooves. A suspension of iron nanoparticles and ethanol was prepared, wherein the mass fraction of iron nanoparticles was 3‰. The magnetic field modulator is placed in a uniform magnetic field of 1 mT, the direction of the magnetic field is vertically upward, and the upper surface of the magnetic field modulator is perpendicular to the direction of the magnetic field. Place the base material polyimide film on the upper surface of the magnetic field modulator, add the suspension of iron nanoparticles and ethanol to the base material by dropping, the magnetic particles in the suspension will be deposited under the induction of the magnetic field, A barcode pattern consistent with the upper surface of the magnetic field modulator is formed, as shown in Figure 5. Finally, the pattern is pressed with a glass skin and covered with a layer of PET film as a protective film.

Embodiment 24

The magnetic field modulator in this embodiment is shown in FIG. 3 , and the magnetic field modulator is composed of low-permeability material plastic and high-permeability material iron. The plastic constitutes the main structure of the magnetic field modulator, the grooves with barcode patterns are pre-designed on the upper surface of the main structure, and iron powder is filled in the grooves. A suspension of iron nanoparticles and ethanol was prepared, wherein the mass fraction of iron nanoparticles was 3‰. The magnetic field modulator is placed in a uniform magnetic field of 20 mT, the direction of the magnetic field is vertically upward, and the upper surface of the magnetic field modulator is perpendicular to the direction of the magnetic field. A PET film is placed as the base material on the upper surface of the magnetic field modulator, and a suspension of iron nanoparticles and ethanol is added to the base material in a dropwise manner. The magnetic particles in the suspension will be deposited under the induction of the magnetic field to form and The consistent barcode pattern on the upper surface of the magnetic field modulator is shown in Figure 5. Finally, the pattern is pressed with a glass skin and covered with a layer of PET film as a protective film.

Embodiment 25

The magnetic field modulator in this embodiment is shown in FIG. 3 , and the magnetic field modulator is composed of low-permeability material plastic and high-permeability material iron. The plastic constitutes the main structure of the magnetic field modulator, the grooves with barcode patterns are pre-designed on the upper surface of the main structure, and iron powder is filled in the grooves. A suspension of iron nanoparticles and ethanol was prepared, wherein the mass fraction of iron nanoparticles was 3‰. The magnetic field modulator is placed in a uniform magnetic field of 20 mT, the direction of the magnetic field is vertically upward, and the upper surface of the magnetic field modulator is perpendicular to the direction of the magnetic field. A substrate is placed on the upper surface of the magnetic field modulator, and the substrate is ordinary printing paper. A suspension of iron nanoparticles and ethanol is added to the substrate by dropwise addition, and the magnetic particles in the suspension will be deposited under the induction of a magnetic field to form a barcode pattern consistent with the upper surface of the magnetic field modulator, as shown in Figure 5. Show. Finally, the pattern is pressed with a glass skin and covered with a layer of PET film as a protective film.

Embodiment 26

The magnetic field modulator in this embodiment is shown in FIG. 3 , and the magnetic field modulator is composed of low-permeability material plastic and high-permeability material iron. The plastic constitutes the main structure of the magnetic field modulator, the grooves with barcode patterns are pre-designed on the upper surface of the main structure, and iron powder is filled in the grooves. A suspension of iron nanoparticles and ethanol was prepared, wherein the mass fraction of iron nanoparticles was 3‰. The magnetic field modulator is placed in a uniform magnetic field of 20 mT, the direction of the magnetic field is vertically upward, and the upper surface of the magnetic field modulator is perpendicular to the direction of the magnetic field. A substrate is placed on the upper surface of the magnetic field modulator, and the substrate is a thin glass sheet with a thickness of 150 μm. A suspension of iron nanoparticles and ethanol is added to the substrate by dropwise addition, and the magnetic particles in the suspension will be deposited under the induction of a magnetic field to form a barcode pattern consistent with the upper surface of the magnetic field modulator, as shown in Figure 5. Show. Finally, the pattern is pressed with a glass skin and covered with a layer of PET film as a protective film.

Embodiment 27

The magnetic field modulator in this embodiment is shown in FIG. 3 , and the magnetic field modulator is composed of low-permeability material plastic and high-permeability material iron. The plastic constitutes the main structure of the magnetic field modulator, the grooves with barcode patterns are pre-designed on the upper surface of the main structure, and iron powder is filled in the grooves. A suspension of iron nanoparticles and ethanol was prepared, wherein the mass fraction of iron nanoparticles was 3‰. The magnetic field modulator is placed in a uniform magnetic field of 20 mT, the direction of the magnetic field is vertically upward, and the upper surface of the magnetic field modulator is perpendicular to the direction of the magnetic field. Place the base material polyimide film on the upper surface of the magnetic field modulator, add the suspension of iron nanoparticles and ethanol to the base material by dropping, the magnetic particles in the suspension will be deposited under the induction of the magnetic field, A barcode pattern consistent with the upper surface of the magnetic field modulator is formed, as shown in Figure 5. Finally, the pattern is pressed with a glass skin and covered with a layer of PET film as a protective film.

Embodiment 28

The magnetic field modulator in this embodiment is shown in FIG. 3 , and the magnetic field modulator is composed of low-permeability material plastic and high-permeability material iron. The plastic constitutes the main structure of the magnetic field modulator, the grooves with barcode patterns are pre-designed on the upper surface of the main structure, and iron powder is filled in the grooves. A suspension of iron nanoparticles and ethanol was prepared, wherein the mass fraction of iron nanoparticles was 3‰. The magnetic field modulator is placed in a uniform magnetic field of 0.5 mT, the direction of the magnetic field is vertically upward, and the upper surface of the magnetic field modulator is perpendicular to the direction of the magnetic field. Place the substrate polyimide film on the upper surface of the magnetic field modulator, add the suspension of iron nanoparticles and ethanol to the substrate by dropwise, the magnetic particles in the suspension will be deposited under the induction of the magnetic field, A barcode pattern consistent with the upper surface of the magnetic field modulator is formed, as shown in Figure 5. Finally, the pattern is pressed with a glass skin and covered with a layer of PET film as a protective film.

Example 29

The magnetic field modulator in this embodiment is shown in FIG. 6 , and the magnetic field modulator is composed of low magnetic permeability material plastic and high magnetic permeability material iron. The plastic constitutes the main structure of the magnetic field modulator, the grooves of the two-dimensional code pattern are pre-designed on the upper surface of the main structure, and the iron powder is filled in the grooves. A suspension of iron nanoparticles and ethanol was prepared, wherein the mass fraction of iron nanoparticles was 3‰. The magnetic field modulator is placed in a uniform magnetic field of 20 mT, the direction of the magnetic field is vertically upward, and the upper surface of the magnetic field modulator is perpendicular to the direction of the magnetic field. Place the base material polyimide film on the upper surface of the magnetic field modulator, add the suspension of iron nanoparticles and ethanol to the base material by dropping, the magnetic particles in the suspension will be deposited under the induction of the magnetic field, A two-dimensional code pattern consistent with the upper surface of the magnetic field modulator is formed, as shown in Figure 5. Finally, the pattern is pressed with a glass skin and covered with a layer of PET film as a protective film.

Claims (3)

1. a method for a bar code or two-dimensional code based on magnetic particles, characterized in that, the magnetic field modulator with a pattern on the surface is put into a magnetic field, and the magnetic particles are deposited into the pattern of a bar code or two-dimensional code under the induction of the modulated magnetic field ; The magnetic field modulator includes a main body with pattern grooves or holes on the upper surface and a filling material filled in the pattern grooves or holes; when the main body is a low magnetic permeability material, the filling material is a high magnetic permeability material; When the main body is a high magnetic permeability material, the filling material is a low magnetic permeability material; the height here is relative, that is, the main body and the filling material have different magnetic permeability; Put the magnetic field modulator with a barcode or two-dimensional code pattern on the surface into the magnetic field, place the substrate on the surface of the modulator, add magnetic particles to the surface of the substrate, and the magnetic particles are induced by the magnetic field to form a surface pattern with the magnetic field modulator. For the same pattern, the barcode or QR code pattern is pressed, and the surface of the pattern is covered with a protective film. 2. method according to claim 1, is characterized in that, magnetic particle is Fe-based magnetic particle, Co-based magnetic particle, Ni-based magnetic particle, alloy magnetic particle, ferrite magnetic particle, Fe3O4-coated Or magnetic particles with core-shell structure coated with ferric oxide or a mixed system thereof. 3. The method according to claim 1, wherein the magnetic field modulator is placed in a position where the magnetic flux density in the magnetic field is greater than 0.5 mT.

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