JPH02297693A - Magnetic substance bar code - Google Patents

Abstract

PURPOSE:To obtain the bar code of satisfactory durability at low cost by providing recessed rectangular patterns, in which magnetic substance powder is respectively embedded, in arrangement with intervals and width, which are determined in advance, on the plate surface of a non-magnetic resin plate. CONSTITUTION:On the plate surface of a non-magnetic resin plate 1, as the female mold of the bar code, plural rectangular patterns 2 are provided in the recessed shapes in the arrangement with the intervals and width which are determined in advance. Next, magnetic substance powder 3 is embedded in the recessed parts of the rectangular patterns 2 and liquid-state adhesive agent is immersed. Then, the magnetic substance powder 3 is fixed in the recessed parts of the patterns. Since permeability can be freely adjusted for the magnetic substance powder 3 by mixing various magnetic substances, the permeability can be set to an optimum value in correspondence to a magnetic sensor used for reading. Thus, the bar code of the satisfactory durability can be formed at low cost.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a barcode using a magnetic material.

[Conventional technology]

In recent years, computers have been widely introduced for OA and FA in logistics management, and are widely used, for example, for managing product sales in large-scale retail stores and for managing the production of parts and products in manufacturing processes. Devices that optically read printed barcodes are often used as input terminal devices, and printed strip patterns (optical barcodes) are added to products and parts. This optical barcode has the advantage that it can be read from a relatively long distance, but has the disadvantage that it is susceptible to dirt (for example, attached dust) during reading and is inferior in durability. In particular, conventional optical barcodes cannot be used in manufacturing processes where there is a high risk of contamination.

On the other hand, in recent years, an engraved barcode that has a plurality of rectangular patterns engraved in concave or convex shapes on a metal plate has become known as a stain-resistant barcode (1988 Japanese Society of Applied Magnetics, Academic Lecture Abstracts, p. 307).

The structure of this stamped barcode is shown in FIGS. 3(a) and 3(b).

(a) is a qZ plane, and (b) is a cross-sectional view. In the figure, a rectangular pattern 2 is stamped on L of the iron plate 4.

This engraved barcode can be read using 61 degrees of power. That is, when a DC magnetic field or an AC magnetic field is applied to the iron plate 4, the applied magnetic field is distorted by the rectangular pattern 2 of the iron plate 4''. Since the distortion can be detected by a magnetic sensor, the pattern of the iron plate 4] can be detected from the output of the magnetic sensor. That is, barcodes can be detected.

Since the magnetic field is not affected by dirt, engraved barcodes can be read without being affected by dirt. In addition, the irregularities (turns) on the board sink into the optical barcode and are highly durable.

[Problem to be solved by the invention]

However, although engraved barcodes are highly durable, they have the problem of being extremely difficult to process.

That is, in order to suppress the width of the entire barcode to within a few centimeters, the barcode must have a minimum bar width of 0.1 m to 0.5 strokes. However, the accuracy of the engraving is.

When using a normal machine tool, the machining accuracy is limited to about 0.3 m, and even a groove width of 0.5αI takes a long time of 6 seconds, making the engraved barcode itself very expensive. There was a drawback that it became impractical.

One object of the present invention is to eliminate such conventional drawbacks and provide a magnetic barcode that can be easily worked.

[Means to solve the problem]

In order to achieve the above object, the magnetic barcode of the present invention has a concave rectangular pattern in which magnetic powder is embedded in an array with a predetermined interval and width on the surface of a non-magnetic resin plate. It is something.

[Effect]

In the magnetic barcode of the present invention, magnetic powder and non-magnetic resin are used instead of a metal plate, so it is easy to create two barcodes. Furthermore, by producing the non-magnetic resin portion by injection molding, thick wire production is also easy.

In addition, the magnetic permeability of magnetic powder can be freely adjusted by mixing various magnetic substances, so it is possible to set the magnetic permeability to an optimal value according to the magnetic sensor used for reading.
It is Noh.

〔Example〕

Next, an embodiment of the present invention will be described with reference to FIGS. 1 and 2. (a) is a plan view, and (b) is a cross-sectional view. In FIG. 1(a), a plurality of rectangular patterns 2 are formed on the surface of the non-magnetic resin plate 1 in an arrangement with predetermined intervals and widths as female barcode patterns. As shown in FIG. 1(b), the rectangular pattern 2 is provided in a concave shape.Firstly, magnetic powder 3 is embedded in the concave portion of the rectangular pattern 2, and liquid adhesive is soaked therein.

Magnetic powder 3 is fixed within the recesses of the pattern. Magnetic powder 3
The liquid adhesive may be replaced by a mixture of the magnetic powder 3 and a binder.

When the magnetic barcode made in this way was read with a magnetic sensor for reading engraved barcodes, it was possible to read it as well as the engraved barcodes. The resin containing the magnetic powder 3 dissolved therein is poured into the recesses of the rectangular pattern 2, and the magnetic powder 3 is applied to the surface of the non-magnetic resin plate 1 at a constant thickness as shown in FIG. This is an example in which it was raised and solidified.

In the embodiment shown in FIG. 2, the rectangular pattern 2 can be read from the back side of the non-magnetic resin plate 1 with a magnetic sensor. Moreover, the effect that the non-magnetic resin plate 1 also serves as a protective film for the rectangular pattern 2 can also be obtained. In the example shown in FIG. 2 as well, good reading was possible with the magnetic sensor for stamped barcodes.

〔Effect of the invention〕

As described in -1- above, the present invention has the effect of easily providing barcodes that are not affected by stains, including treatments such as painting, and have excellent durability, that is, at low cost. .

[Brief explanation of the drawing]

FIG. 1(a) is a plan view showing a first embodiment of the present invention;
b) is a sectional view, FIG. 2(a) is a plan view showing the second embodiment of the present invention, FIG. 3(b) is a sectional view, and FIG. b) is a sectional view. 1. Non-magnetic resin plate 2. Rectangular pattern 3.
・Magnetic powder

Claims (1)

[Claims] (1) A magnetic barcode characterized by having a concave rectangular pattern in which magnetic powder is embedded in an arrangement with a predetermined interval and width on the surface of a non-magnetic resin plate.