JPS6261197A - Planar resonance circuit tag - 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 (Industrial Application Field) The present invention generally relates to a resonant circuit, and particularly relates to a tag-shaped detection means that is formed into a planar shape and is used in a shoplifting prevention device. It is something.

In particular, it relates to a planar resonant circuit tag that distinguishes the advantages and disadvantages of etching printed circuit boards and skillfully incorporates etching and other means.

(Conventional technology) There are various devices that prevent shoplifting of products from stores and the like.

Among them, there is one that uses a tag-shaped resonant circuit (dedicated) that resonates with radio waves of a preset type and signal using radio waves.

This is because the tags are disposable and are used in large quantities for products with low unit prices, so the cost must be extremely low. Therefore, in the past, coils and capacitors were created by themselves using printed circuit board etching technology.

Therefore, if we describe this concretely, it will be as follows.

1 to 4 relate to the planar resonant circuit tag according to the present invention, which will be explained later, but there is a tag-shaped resonant circuit shown in FIG. 5. This is the 5th A
As shown in the figure, poles 3a and 4a of each of the coil 2 and capacitors 3 and 4 are formed on one surface of the insulating sheet 1 by etching technology. Similarly, as shown in FIG. 5B, the other poles 3b and ilb of the capacitors 3 and 7N are formed on the other surface of the insulating sheet 1 by etching. This creates the resonant circuit shown in Figure 6.

This manufacturing method is generally known as shown in FIGS. 7 and 7A8.

First, this is the same thing as above in Figure 7A and Figure 7.
As shown in FIG. 7C, the insulating sheet 1 is continuously etched on both sides of the insulating sheet 1 at the same time as shown in FIG. 7C. In the case of FIG. 8, these are simultaneously formed on one surface as shown in FIG. 8A, and the front sectional view of FIG. 8B clearly illustrates this. And this is the 8th
By bending it as shown in Figure C it1, the same thing as above is made. This is shown in Figures 9 and 10 (particularly as shown in Figures 9 and 10), using conventional multilayer printed circuit board technology, the circuits on the front side and the circuit on the back side of the insulating sheet are made separately, and then It is also conceivable that this is pasted onto the .

(Problems to be Solved by the Invention) In the conventional tags of this type, the problem of etching has become a major problem. That is, as mentioned above, the unit price of this type of tag must be extremely low.

However, it is quite difficult to perform etching at low cost.

The reason for this is that although it is possible to reduce the cost of the capacitor's metal foil by making it thinner, it is not possible to make the coil's metal foil thinner because it increases its resistance.5. Since the etching is done simultaneously on the front and back sides, if only one side is thin, the etching will not be balanced, resulting in a series of defective products. Therefore, I had no choice but to connect capacitors 3b and 4b.
The metal foil on the side of the chisel is also made to have the same thickness as that on the side of the coil 2, so it is not worth it if the cost increases accordingly.

Of course, it is possible to change the thickness of the metal foil on both sides, but in this case, since the etching speed is the same, one side tends to be over-etched, and the other side tends to be too shallow, resulting in bridging, which is difficult to adjust. It becomes difficult.

Further, while the metal foil on the side of only the capacitors 3b and 4h has a very large area to be melted, it is difficult to reduce the thickness of the metal foil. Therefore, its melting "tl Ii,"
The manufacturing cost increases because the large pieces of melted metal become contaminated and become unusable immediately.

(Means for Solving the Problems) In view of the above problems, nine planar Jt and tR according to the present invention
For the circuit tags, for the capacitors 3b and 4b, the shape of the electrodes is formed in advance by pressing and then pasted, or since it is thin enough, the shape is decided and vapor-deposited, hot-pressed, or conductive. It excludes etching processes such as printing with ink.

Therefore, the four-body structure of the planar resonant circuit tag according to the present invention will be described below.

First of all, there is the Zetsu & issue sheet. -One side of the second insulating sheet has one of the electrodes of the capacitor. The electrodes of this capacitor have a defined shape and are attached. After the product, a circuit pattern of the other electrode of the capacitor and a coil connected thereto is provided at a position opposite to the electrode of the capacitor. The circuit pattern of the capacitor and coil is formed by etching on the other surface of the insulating sheet.

<Function> Under the configuration described below (421), the shell-shaped resonant circuit tag according to the present invention has the following function.

First, on one side of the PI sheet, there is a circuit pattern for only one of the electrodes of the capacitor, and the shape is determined and attached. In other words, the capacitors 3b and 4b may have electrodes formed in advance by press processing, or may be thin.
Since it eliminates etching processes such as vapor deposition, hot pressing, and printing with conductive ink after determining the shape, it eliminates the uneconomical effects of etching and can now serve its purpose. .

(Embodiment) The planar resonant circuit tag according to the present invention will be described in detail below using one embodiment thereof, together with the attached drawings.

1st! Figure 1 is a surface view of an embodiment of the planar resonant circuit tag of the present invention, and Figure 1B: ? It is a back view.

First, the sheet 1 made of polyethylene is -5. The insulating sheet 1 may be made of any material that has high dielectric properties, such as IH or aluminum foil, as long as it is made of a material that is easy to heat.

On the surface side of this insulating sheet 10, the coil 2 and one electrodes 3a and 4 of the capacitors 3 and 11 connected to the coil 2 are arranged.
1 circuit pattern is provided. Incidentally, the circuit pattern of the coil 2 and capacitors 3 and 4 is made by etching on the front side of the above-mentioned insulating sheet, similar to the planar resonant circuit tag from IY.

After cooling, the other electrodes 31 and 4b of the capacitors 3 and 4 are provided on the back side of the insulating sheet 1 at positions opposite to the electrodes 3a and 4a of the capacitors 3 and 4. This capacitor; 3 and 4 voltages p: +b and 4b are
4S is something that has a fixed shape and is attached.

Incidentally, the electrodes 31 and 11b of the capacitors 3 and 4 are formed by pressing metal foil into a predetermined shape, which is then attached to an insulating sheet 1. FIG. 2 shows an example of this. That is, the electrodes 3b of the capacitors 3 and 4 are formed by pressing the metal foil shown in FIG. 2B on the back side of the insulating sheet 1 having a circuit pattern such as the coil 2 shown in FIG. 2A.
and 4b are pasted together as shown in FIG. 2C.

Note that aluminum is preferable for this metal foil in terms of cost. Therefore, if this is to be made into a bracelet, it is preferable that it extends over the entire length of the side of the tag. Of course, it is better not to look only at that aspect, but to do what is shown in Figure 3A.

That is, the inside of the aluminum tape 5 is shaped into a predetermined shape and force/
- Throat and leave both sides intact. The cut portion 6 of this child 5 is located on the tape 5 and maintains the shape of the tape as a whole. Therefore, the electric current of capacitor 4 is Fi! The part 4b flickers and I hate it.

Therefore, as shown in Figure 3C, the insulation sheet l
-1i can be easily attached. Then, on the other side of this insulating sheet 1, an aluminum sheet 7 for etching the coil 2 and the like is pasted, and a corrosion-resistant ink circuit pattern 8 is printed thereon and then etched.

Finally, this is cut into pieces one by one to complete the circuits shown in the fourth Al surface view and the back view in Figure 4B.

Incidentally, if necessary, the small piece 9 for holding the tape 5 may be removed by etching.

Since this portion is very small, it hardly affects the seven steps of etching.

In order to make this process even easier, electrodes 3b and 4b may be directly attached to the insulating sheet, but it is also possible to attach the surfaces of electrodes 3b and 4b to a protective film. It is preferable to attach the other surfaces of the electrodes 3b and 4b to the insulating sheet 1 after the electrodes 3b and 4b have been removed. In this case, the circuit pattern of the coil 2 etc. can be etched separately. Therefore, there is no need to protect the surfaces of the electrodes 3b and 4h with corrosion-resistant ink.

In this case, there are two insulating sheets, one for the original one and one for the protective film, which may seem to increase the number of steps, or the protective film for this type of tag can usually be covered in the final process, so that process It is only the first thing.

If this technique is further applied, only the electrodes 3b and 4b of the capacitors 3 and 4 may be etched. That is, this part can be etched independently. Therefore, it is possible to make the metal foil thinner, which reduces the cost, and also because the contamination of the solution can be reduced, resulting in a correspondingly lower cost.

Incidentally, instead of this press processing, the electrodes 3b and 4b of one of the capacitors 3 and 4 may be attached to an insulating sheet while their shape is determined. That is, by printing with a conductive material, the capacitor electrodes 31] and 4
It may be one that is attached to an insulating sheet while its shape is determined as b, or it may be one that is attached to an insulating sheet while its shape is determined by hot stamping with conductive ink. Be able to think.

(Effects of the Invention) Since the planar resonant circuit tag according to the present invention has one or more configurations, the cost of the metal foil is reduced, and contamination of the etching solution is significantly reduced, thereby reducing the cost. or,
Since there is no need to simultaneously etch the front and back sides of the insulating sheet, there is no need to use special etching equipment, and ordinary equipment can be used, resulting in lower costs.

On the other hand, if there is a shift in the corresponding position of each pair of electrodes of a capacitor, the resonance frequency will shift, so in order to prevent this, one electrode is made large, so that even if there is a slight shift in position, the other electrode will always be in the same position. In this case, it is possible to make the electrode for etching larger, thereby reducing the contamination of the melt α and making it possible to reduce the cost. Become.

In addition, the effects of each of the embodiments mentioned in the first sentence have been sufficiently improved.

[Brief explanation of drawings]

FIG. 1A is a front view of an embodiment of the planar double-circuit tag of the present invention, and FIG. 1B is a back view thereof. FIG. 2A is a plan view of the device shown in FIG. 1A during the manufacturing process. FIG. 2B is a plan view of the device shown in FIG. 1B during the manufacturing process. FIG. 2C is a perspective view of the combination of FIGS. 2A and 2B. FIG. 3A corresponds to FIG. 2A and is a plan view of another embodiment. FIG. 3B corresponds to FIG. 2B and is a plan view of another embodiment. FIG. 3C is a side view of the combination of FIGS. 3A and 3B. FIG. 4A is a surface view of the embodiment shown in FIG. 3, which corresponds to FIG. 1A. Figure 1LB corresponds to Figure 1B and is a back view of the embodiment of Figure 3A. FIG. 5A shows a surface view of an embodiment of the conventional device, which corresponds to FIG. 1A. FIG. 5B shows a back view of a conventional example C8 corresponding to FIG. 1B. FIG. 6 is a circuit diagram of the circuit shown in FIG. 5 (including an embodiment of the present invention). FIG. 7A is a plan view of the device shown in FIG. 5A during the manufacturing process. FIG. 7B is a plan view of the device shown in FIG. 5B during the manufacturing process. FIG. 7C is a perspective view of the combination of FIGS. 7A and 7B. FIG. 8A is a plan view of another conventional example, which is in the process of being manufactured. FIG. 8B shows a front cross-sectional view of that of FIG. 8A. FIG. 8C is a perspective view of the device shown in FIG. 8A during the manufacturing process. FIG. 9 is a perspective view of another embodiment of the prior art during its manufacturing process. Figure 1 (+) is a partial side view of another embodiment of the conventional one, which is in the process of being manufactured. 1 - Insulating sheet 2 - Coil: 3.4 - Capacitor 3a, 3b, 4a, 4b - Electrode 5 - Tape 6 - Cut portion 7 - Aluminum sheet 8 - Corrosion resistant ink circuit pattern 9 - Small piece

Claims (12)

[Claims] (1) A planar resonant circuit tag characterized by being composed of the following: A: an insulating sheet; B: one of the electrodes of the capacitor that is shaped and attached to one surface of the insulating sheet; C: the other of the electrodes of the capacitor that is provided at a position opposite to the electrode of the capacitor; A coil to be connected, and this capacitor and coil are provided on the other side of the above-mentioned insulating sheet, and a circuit pattern is formed on this side by etching. (2) The planar resonant circuit tag according to claim 1, wherein the insulating sheet has a high dielectric property. (3) Claim 1, characterized in that the insulating sheet is made of a material to which aluminum foil easily adheres.
Planar resonant circuit tag described in . (4) The planar resonant circuit tag according to claim 1, wherein the insulating sheet is made of polyethylene. (5) The planar resonant circuit tag according to claim 1, wherein one of the electrodes of the capacitor is attached to an insulating sheet after its shape is determined in advance. (6) The shape of one of the electrodes of the capacitor is determined in advance by pressing a metal foil, and the shape is attached to an insulating sheet. Planar resonant circuit tag. (7) The planar resonant circuit tag according to claim 1, wherein one of the electrodes of the capacitor is attached to an insulating sheet with its shape determined. (8) Claim 7, characterized in that one of the electrodes of the capacitor is attached to an insulating sheet while its shape is determined by printing with conductive ink.
Planar resonant circuit tag described in . (9) A planar shape according to claim 7, wherein one of the electrodes of the capacitor is attached to an insulating sheet while its shape is determined by hot stamping with a conductive substance. Resonant circuit tag. (10) A patent characterized in that one of the electrodes of the capacitor, whose shape is determined in advance and then attached to the insulating sheet, extends over the entire length of the side surface of the tag. A planar resonant circuit tag according to claim 5. (11) A patent claim characterized in that one of the electrodes of a capacitor whose shape is determined in advance and then attached to an insulating sheet is directly attached to the insulating sheet. The planar resonant circuit tag according to scope 5. (12) One side of the electrode of a capacitor whose shape is determined in advance and then attached to the insulating sheet is attached to one side of the electrode to a protective film and then the other side is attached to the insulating sheet. 2. The planar resonant circuit tag according to claim 1, wherein the planar resonant circuit tag is