JPH01100710A - Information recording method - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of industrial application] The present invention relates to a novel information recording method that can be preferably used, for example, in automatic production lines in factories.

[Conventional technology]

Figure 8 is the Journal of the Institute of Electrical Engineers of Japan, Vol. 107, No. 6, 646-548.
(6) is a perspective view showing a barcode as a conventional information recording method shown on page (1986), and in the figure, (6)
(7) is a base material that is part of the article; (7) is a marker with a barcode written on the surface of the base material (6); (8)
is a barcode reader that optically reads the barcode of the marker (7).

[Problem that the invention seeks to solve]

Conventional barcodes, for example, are structured as shown above.Inputting information about an item was done by reading the barcode optically, but it was also used as a marker on an automatic production line in a car factory, for example. However, since the barcode is read optically, there is a problem in that the barcode cannot be read after the painting process. Furthermore, if dust adheres to the barcode even before the painting process, there are problems in that reading errors may occur, and the marker may peel off during the process. In addition, the process of attaching and removing the marker was required.

This invention was made to solve the above-mentioned problems. 1. It can be used before and after processes such as painting, does not peel off even when temperature changes, and is stable and has high reading accuracy. The purpose is to provide an information recording method.

[Means for solving problems]

In the information recording method according to the present invention, a diffusion section is provided in a base material by diffusing a material different from that of the base material to have magnetic properties different from those of the base material, and information is stored by this diffusion section.

[Effect]

The diffusion section in the present invention has magnetic properties different from those of the base material, and information is recorded in the diffusion section, its vicinity, or a combination thereof.

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a perspective view illustrating a method for manufacturing a magnetic marker for an automobile as an information recording method according to an embodiment of the present invention. In the figure, (1) is a base material for automobiles, such as a cold rolled steel plate (for example, JIS 5pc
c) It is a part that is being processed using a good ferromagnetic material. (2) is a material different from the base material (1), such as a non-magnetic microscopic material, such as carbon powder. (3) is a diffusion part, and in this example, it is a part formed by heating with a laser beam or the like, and the material (2) is mixed into the base material (1) and diffused, resulting in a change in magnetic properties. . In this case, magnetically variable layers are formed on the substrate (1) at predetermined intervals. (1o) is a magnetic marker for automobiles.

FIG. 2 is a side view showing the state in which the magnetic marker for automobiles obtained as shown in FIG. 1 is magnetized, and in the figure, (4) is an electromagnet for magnetization.

Figure 3 shows a marker (1) magnetized by the method shown in Figure 2.
0) is a perspective view showing how a signal is read using the marker (10), and in the figure, (6) is a sensor such as a Hall element that detects the magnetization remaining in the marker (10).

FIG. 4 is a relationship diagram showing the amount of magnetism detected by the method shown in FIG. 3, with the horizontal axis representing the amount of displacement and the vertical axis representing the amount of a-conversion. In Fig. 1, when a non-magnetic powder such as carbon powder is applied on a base material (1) of a plate-shaped cold-rolled steel plate and then irradiated with a laser beam (not shown), the portion irradiated with the laser beam is rapidly heated and melted, and the carbon element diffuses into the cold rolled steel plate base material (1). Next, when the laser beam is moved, the part that has been irradiated with the laser beam is now rapidly cooled and solidified. Therefore, the portion swept by the laser beam is subjected to rapid heating and cooling action in the form of a line, rod, or plane, and the carbon element diffused into the cold-rolled steel sheet base material is fixed. Therefore, the carbon element is diffused and fixed in the base material (1) of the multi-plate cold rolled steel plate by laser beam irradiation, and the carbon element is diffused and fixed on the surface and/or inside of the base material (1) in the form of linear or Since it is made of a planar magnetically variable layer, that is, a magnetic lattice, it causes extreme residual stress. □The carbon content is also high, so the coercive force is large. For example, when magnetized using the method shown in Figure 2, a large Residual magnetization occurs. Furthermore, the irregularities on the surface of the base material (1) can be made so small that they can be ignored. Therefore, arbitrary information can be recorded by arbitrarily selecting the interval or width of laser beam irradiation, or a combination thereof. The recorded information can be detected by using an element that detects the amount of residual magnetization, such as a Hall element, as shown in FIG. Reading becomes possible. If necessary information is written in the encoded magnetized pattern in this way, it can be used as an information recording method such as a marker.

Since magnetism is used, information can be read even after the surface of the base material (1) is coated, for example. For example, it is easy to further automate the process by combining it with a microcomputer.

In addition, the said diffusing part (3) can be arbitrarily changed, for example in the range of several tens of micrometers to several tens of micrometers, by selecting the beam width of a laser beam to a desired value. Therefore, it can be the same code system as existing barcodes, or it can be any code.

Furthermore, when a laser beam is used to form a magnetically variable layer with a very narrow width, residual magnetization can be detected in a pulsed manner as shown in FIG.

It is more stable and has much higher detection sensitivity than conventional methods.

Note that the information to be recorded is of course arbitrary, and can include various information such as the coded name of the article, the color, size, shape, lot number, and manufacturing date of the paint to be applied in the next process. Also, depending on the amount of information to be recorded, the diffusion section (8)
The number, width, etc. of the rods may be changed, and at least one rod-shaped rod may be used. Furthermore, the shape of the diffusion part (3) does not have to be bar-shaped, and may be, for example, a curved line, a circle, a dot, or the like.

In this example, 5pcc was described as the ferromagnetic material as the base material (1), but other ferritic stainless steels, such as 5US41TL, 5US480, etc., may also be used. A ferromagnetic material made of an alloy such as copper, zinc, chromium, nickel, manganese, or aluminum may be used. Alternatively, it may be made of ferromagnetic ceramic.

Furthermore, the base material (1) is a ferromagnetic material made of ferritic stainless steel, and when Ni is used as the raw material, that part becomes non-magnetic when heated and the magnetic properties change, so the same effect as above can be obtained. It will be done.

In addition, in the above example, heating was performed using a laser beam, but
Heating may also be done by other thermal methods such as electron beam, plasma, etc.

Furthermore, in the above example, a material (2) different from the base material (1)
Although fine powder of non-magnetic carbon powder is used as the material, the present invention is not limited to this, and for example, powder of a compound such as M n + N i may be used.

Furthermore, as the material (2) different from the base material (1), in addition to coating the fine powder as described above, for example, as shown in FIG. 5, a thin film (
20) may be applied.

That is, in FIG. 5, a laser beam is applied to a nickel film (20) deposited by plating on the surface of a plate-shaped ferritic stainless steel SUS 430 base material (1) made of a ferromagnetic Fe-Cr alloy. When the laser beam is irradiated, the part irradiated with the laser beam is rapidly heated and melted, and the base material (1)
The ferromagnetic nickel melts inside. Next, when the laser beam is moved, the linear area where the laser beam has been swept is subjected to rapid heating and cooling action in a planar manner, and the area where the nickel has melted, that is, the diffusion area (3), becomes non-magnetic. Fe of
-Changes to onisteinite stainless steel made of Cr-Ni alloy. In this way, a plate-shaped ferromagnetic Fe-Cr
The laser beam was irradiated onto the ferromagnetic nickel, which was deposited on the surface of the ferritic stainless steel base material by plating or other methods, so that nickel was deposited on the surface or inside of the base material in a linear or planar manner. Ferromagnetic Fe-
Non-magnetic F6 is applied linearly or planarly to the surface or inside of a ferritic stainless steel substrate made of a Cr-based alloy.
A magnetic change layer of austinato stainless steel made of a -Cr-Ni alloy, that is, a diffusion section (3) made of a magnetic lattice is formed. Since the diffusion portion (3) thus formed is non-magnetic, residual a does not occur when it is magnetized by the method shown in FIG. 2 as in the previous embodiment. Therefore, it is better to record information by arbitrarily selecting the interval of laser beam irradiation, and to use an element such as a Hall element to detect the amount of residual magnetization as shown in Figure 3. A relationship diagram between the amount of displacement and the amount of residual magnetization is obtained, and it becomes possible to read recorded information by detecting the signal.

In addition, in this example, ferritic stainless steel 5US480 was used as the ferromagnetic material serving as the base material, but other ferromagnetic stainless steels may be used, and a method using a laser beam was described as a thermal method. but,
Similar effects can be obtained using other thermal methods such as electron beams. Further, in this embodiment, the nickel ferromagnetic film remains attached, but the ferromagnetic film may be removed by a method such as polishing.

Further, the thin film (20) shown in FIG. 6 may be a non-magnetic film made of carbon, manganese, etc., in addition to the above-mentioned ferromagnetic film. That is, for example, in FIG. 6, when a laser beam is irradiated onto a carbon film deposited on the surface of a plate-shaped ferromagnetic ferritic stainless steel 5US480 base material, the portion irradiated with the laser beam is rapidly heated and melted.

Non-magnetic carbon diffuses into the base material. Next, when the laser beam is moved, the part that has been irradiated with the laser beam is now rapidly cooled and solidified. Therefore,
The area swept by the laser beam is rapidly heated and cooled in a linear or planar manner, forming non-magnetic austenitic stainless steel. In this way, a laser beam was irradiated onto the non-magnetic carbon deposited on the surface of the plate-shaped ferromagnetic ferritic stainless steel 5O8480 by a method such as vapor deposition. A nonmagnetic layer of austenitic stainless steel, in which carbon is diffused in a linear or planar manner, on the surface or inside of a ferromagnetic ferritic stainless steel base material, in a linear or planar manner.
That is, a magnetic grid is formed.

Since the diffusion portion (3) formed as described above is non-magnetic, no residual magnetization occurs when it is magnetized by the method shown in FIG. 2 as in the previous embodiment.

Therefore, by arbitrarily selecting the laser beam irradiation interval and using an element such as a Hall element to detect the amount of residual magnetization as shown in FIG. 3, the relationship between the amount of displacement and the amount of residual magnetization as shown in FIG. 6 can be obtained. A diagram is obtained and the signal can be detected.

Furthermore, in the above embodiment, the amount of residual magnetization was detected by magnetizing at least one of the base material and the heated part, but the amount of residual magnetization was detected without being magnetized in advance, as shown in FIG. , Using the excitation magnet (9) and the element 1 for detecting the amount of magnetic flux, such as the Hall element (5), find the relationship between the amount of displacement and the amount of detected magnetic flux similar to that shown in FIG. 4 or FIG.
However, it is also possible to detect signals.

Furthermore, if such an excitation type magnetic detector is used, there is no need to worry about magnetizing it in advance, and there is no problem that the magnetization pattern changes during the process and the reading accuracy deteriorates.

Incidentally, in the above embodiment, a case was explained in which a steel plate for automobiles was used as the base material, but it is needless to say that the present invention is not limited to this. In addition, in this book, diffusion includes not only things that diffuse thermally into a base material to form an alloy as described above, but also things that simply exist in a dispersed state, and things that involve a chemical reaction in a broad sense. . Furthermore, there is no problem in writing information at the magnetization stage.

〔Effect of the invention〕

As described above, according to the present invention, a material different from the material is diffused into the base material to provide a diffusion part with magnetic properties different from that of the base material, and information is stored by this diffusion part, so that it is possible to paint the base material. It can be read even after the above steps, and there is no fear of peeling off due to temperature changes, resulting in stable and high reading accuracy.

[Brief explanation of the drawing]

FIG. 1 is a perspective view illustrating a method for manufacturing a magnetic marker for an automobile as an information recording method according to an embodiment of the present invention, and FIG. 2 shows a magnetic marker for an automobile obtained by the method shown in FIG. 1. Side configuration diagram showing the state of magnetization, No. 8
The figure is a perspective view showing how the amount of displacement is detected using a magnetized magnetic marker for automobiles, and FIG. 4 is a relationship diagram showing the relationship between the amount of magnetization and the amount of displacement detected by the method shown in FIG. 8. , FIG. 5 is a perspective view illustrating a method of manufacturing a magnetic marker for an automobile according to another embodiment of the present invention, and FIG. FIG. 5 is a relationship diagram showing the relationship between the amount of magnetization and the amount of displacement detected by the method shown in FIG. FIG. 8 is a perspective view showing a barcode marker as a conventional method. (L)--Base material (base material for automobiles), (2)--Material, (
3) Diffusion part. In addition, in the figures, the same reference numerals are the same or corresponding parts are 1 figure 3, Koenbe Koi, Tateryo city 5 centroid 6 figure g, Quantity procedure amendment document March 15, 1988, Chief of the Bureau of Licensing. Palace 1, Indication of the case Patent Application No. 266119 of 1988 2, Method for recording information on the name of the invention 3, Relationship with the amendment person case Patent applicant address 2-2-3 Marunouchi, Chiyoda-ku, Tokyo Name Name (601) Mitsubishi Electric Corporation Representative Moriya Shiki 4, Agent address: 4th floor, Marunouchi Building, 2-4-1 Marunouchi, Chiyoda-ku, Tokyo Telephone: (216) 5811 (Representative) 6, Contents of amendment

Claims (12)

[Claims] (1) Information recording characterized in that a material different from that of the base material is diffused into a base material to provide a diffusion part whose magnetic properties are different from those of the base material, and information is stored by this diffusion part. Method. (2) The information recording method according to claim 1, wherein the base material is a ferromagnetic material. (3) The information recording method according to claim 2, wherein the base material is a cold rolled steel plate. (4) The information recording method according to claim 2, wherein the base material is an alloy of copper, zinc, aluminum, chromium, nickel, or manganese whose main component is iron. (5) The information recording method according to any one of claims 1 to 4, wherein the material is a microscopic non-magnetic material. (6) The information recording method according to claim 5, wherein the nonmagnetic microscopic material is a nonmagnetic powder containing any one of C, Mn, and N. (7) The information recording method according to any one of claims 1 to 6, characterized in that the material is deposited as a thin film on the surface of the substrate by plating or vapor deposition, and then diffused. (8) The information recording method according to claim 7, wherein the thin film is a ferromagnetic film made of iron, nickel, or cobalt. (9) The information recording method according to claim 7, wherein the thin film is a nonmagnetic film made of either chromium or molybdenum. (10) The information recording method according to any one of claims 1 to 9, wherein at least one of the base material and the diffusion section is magnetized. (11) Claim 1, characterized in that the diffusion section is linear and consists of a plurality of magnetic gratings arranged in tandem.
The information recording method according to any one of Items 1 to 10. (12) The information recording method according to claim 11, wherein the diffusion portions arranged in a column have different widths or intervals between adjacent diffusion portions.