JPH065000U - Data carrier mounting structure - Google Patents

Abstract

(57) [Summary] [Purpose] A data carrier mounting structure for mounting a data carrier using an induction coil without a core on a metal device or object for communication or communication with an induction coil without a core. An object of the present invention is to secure a communication transmission distance by suppressing generation of a demagnetizing field generated by an induced current flowing in a conductive object when carrying electric power without increasing the thickness at the time of mounting. [Structure] An amorphous magnetic material sheet, that is, an amorphous magnetic material sheet is arranged between a conductive object and a data carrier.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a data carrier mounting structure when a data carrier using an induction coil without a core is mounted on a metal device or object for use.

[0002]

[Prior art]

 Conventionally, an alternating magnetic field having a relatively low frequency of about several tens KHz to several MHz is used as a medium for communication or communication and electric power transfer, and reading and writing of memory can be performed in a non-contact manner with a space of several mm to several tens of cm. Contact data carriers have been announced (JP-A-1-184781, etc.).

In a communication system using such a data carrier, an induction coil is arranged in each of the data carrier and the reader / writer, and communication or communication and power transfer between the reader / writer and the data carrier are performed by electromagnetic inductive coupling. Is going. As shown in FIG. 4, this induction coil has magnetic cores 4 and 5 in both the induction coil 2 on the data carrier 1 side and the induction coil 3 on the reader / writer side. The data carrier 1 provided with the induction coil 2 having the magnetic core 4 can be operated even if it is attached to a metallic object, but it has front and back sides and operates when attached to the inside out. Will not do. The FA data carrier that stores machining data and the like uses a magnetic core 4 made of ferrite or the like, assuming that it will be attached to a metal surface.

On the other hand, as shown in FIG. 5, there is a data carrier 1 having only an induction coil 2 having no magnetic core. In a data carrier using this coreless induction coil, it is not necessary to distinguish between front and back, and it can be made thinner because it has no core.

[0005]

[Problems to be solved by the device]

 By the way, when using the data carrier by mounting it on a gas cylinder or a stainless steel barrel, there is a demand to mount it without protruding as much as possible from the mounting object, and the ferrite core used in the FA data carrier is expensive. There is a low cost requirement, and to realize this, a data carrier with an induction coil without a core may be used.

However, when the data carrier 1 having the induction coil 2 without a core is attached to the metal surface 5 as shown in FIG. 5, the magnetic field is generated in the metal by the alternating magnetic field due to the electromagnetic coupling with the induction coil 3 on the reader / writer side. An induced current flows, and this induced current causes a demagnetizing field (a reverse magnetic field that acts in a direction that weakens the magnetic field between the coils), making writing / reading impossible, or reducing the writable / readable distance. There is a problem that it becomes extremely short.

Therefore, in a data carrier equipped with an induction coil without a core, by attaching it to a metal surface via a spacer or the like made of an insulator, the influence of the demagnetizing field is suppressed and the communication transmission distance is secured. is doing. However, in order to eliminate the generation of the demagnetizing field, it is necessary to use a sufficiently thick insulator spacer. With this, even if there is no core, the amount of protrusion from the object is large and the core is thin. None The advantages of data carriers using induction coils cannot be fully utilized.

The present invention has been made in view of the above conventional problems, and generates a demagnetizing field generated by an induced current flowing in a conductive object when performing communication or communication and power transfer with an induction coil without a core. It is an object of the present invention to provide a data carrier mounting structure capable of suppressing the thickness without increasing the thickness.

[0009]

[Means for Solving the Problems]

 In order to achieve this object, the present invention is configured as follows. First, the present invention has a data carrier for writing or reading data to or from a memory by performing communication or communication and power transfer by electromagnetic induction coupling with an external unit by an induction coil having no core. The target is a data carrier mounting structure that is mounted on a conductive object such as.

In the present invention, such a data carrier mounting structure is characterized in that a non-crystalline (amorphous) magnetic material sheet is arranged between the conductive object and the data carrier. Here, the amorphous magnetic material sheet and the data carrier are attached to the mounting surface of the conductive material using an adhesive or a double-sided adhesive tape. Alternatively, the amorphous magnetic sheet and the data carrier may be integrally molded and attached to the conductive object.

[0011]

[Action]

 According to the data carrier mounting structure of the present invention having such a configuration, since the amorphous magnetic material sheet, that is, the amorphous magnetic material sheet has extremely low electric conductivity and high magnetic conductivity, the induction coil Most of the magnetic flux that passes through passes through the amorphous magnetic sheet, does not generate a demagnetizing field due to the induced current, and can secure a communication transmission distance almost the same as when there is no metal surface on the back of the data carrier. it can .

Further, the thickness of the amorphous magnetic material sheet is very small, and the thickness of the amorphous magnetic material sheet is almost the same as the protruding amount when the data carrier is directly attached.

[0013]

FIG. 1 is a block diagram of an embodiment showing an embodiment of the present invention. In FIG. 1, reference numeral 1 denotes a data carrier, which has a disk-shaped package shape in this embodiment, and an induction coil 2 having no core is provided inside. Further, in the data carrier 1, similar to the memory module of JP-A-1-184781, a nonvolatile memory, a memory controller, a modulation / demodulation circuit for communication using the induction coil 2, and further an induced voltage of the induction coil 2 A power supply circuit that creates power is provided.

The data carrier 1 is used, for example, in a state where it is attached to a predetermined mounting surface 10a of a conductive object 10 made of metal such as the bottom of a cylinder or the body of an automobile. When the data carrier 1 is attached to the mounting surface 10a of the conductive object 10, a thin amorphous magnetic sheet 6 having a thickness of about 0.1 mm, for example, is arranged as an amorphous conductive sheet.

FIG. 2 shows the mounting structure of the data carrier 1 on the mounting surface 10a of the conductive object 10 in the embodiment of FIG. 1. As is apparent from FIG. The amorphous magnetic material sheet 6 is attached to the mounting surface 10a with the adhesive 7, and the data carrier 1 is attached to the amorphous magnetic sheet 6 with the adhesive 8.

The amorphous magnetic material sheet 6 has a sufficient size to accommodate the data carrier as shown in FIG. 2B. Next, the operation will be described with reference to FIG. 1. For the data carrier 1 mounted on the mounting surface 10a of the conductive object 10 via the amorphous magnetic sheet 6, the induction coil on the reader / writer side. 3 face each other, and perform electromagnetic communication between the induction coils 2 and 3 to perform communication between the reader / writer and the data carrier 1 and transfer power from the reader / writer side to the data carrier 1. At this time, a magnetic flux 9 shown by an arrow is generated between the induction coils 2 and 3.

Here, the amorphous magnetic sheet 6 has extremely low electric conductivity and high magnetic conductivity. Therefore, most of the magnetic flux 9 passes through the amorphous magnetic material sheet 6, but since the electric conductivity is low, the induced current due to the magnetic flux 9 does not flow in the amorphous magnetic material sheet 6, and therefore the demagnetizing field in the direction of weakening the magnetic flux 9 is generated. Never occurs. Therefore, by providing the amorphous magnetic material sheet 6, it is possible to secure a communication transmission distance substantially the same as when the metal surface is not behind.

Further, since the amorphous magnetic material sheet 6 is extremely thin, about 0.1 mm, even if the amorphous magnetic material sheet 6 is provided between them, the amount of protrusion is about the same as when the data carrier 1 is directly attached. be able to. FIG. 3 is a block diagram of an embodiment showing another embodiment of the present invention. In the embodiment of FIG. 3, as shown in FIG. 3 (a), the amorphous magnetic material sheet 6 and the data carrier 1 are integrated into a molded body 12 molded with silicon rubber or epoxy resin. The molded body 12 is attached to the mounting surface 10a of the conductive body 10 with the adhesive 7.

As described above, the data carrier 1 and the amorphous magnetic material sheet 6 are integrally formed into a molded body 12 by molding to further improve impact resistance and weather resistance when mounted on the conductive object 10. You can In the above embodiment, the case where the data carrier 1 is provided with one induction coil 2 is described as an example for simplification of description. However, when one induction coil 2 is provided, transmission / reception is performed. In this case, one induction coil is also used as a single induction coil. On the other hand, separate induction coils may be provided for transmission and reception.

Further, although the data carrier 1 has a disk-shaped package shape, it may have an appropriate shape such as a rectangle according to need. Further, a double-sided adhesive tape may be used instead of the adhesive.

[0021]

[Effect of device]

 As described above, according to the present invention, it is possible to attach a data carrier without a core, which is inexpensive in price, to a metal surface so as to be substantially in close contact with the metal carrier, thereby obtaining high economic efficiency. In addition, since the amount of protrusion at the time of mounting is a very small amount determined by the thickness of the data carrier, for example, even if the data carrier is mounted in the recessed part inside the bottom of the cylinder, it does not protrude from the bottom surface, It is possible to surely prevent the data carrier from being damaged due to a collision or the like.

Further, even if the data carrier for FA is attached to an automated guided vehicle or a pallet equipped with a work to be machined, the amount of protrusion is small and the safety is extremely high. Furthermore, since it is a data carrier without a core, it can be used without distinction between the front and back, and since the amorphous magnetic material sheet has a high magnetic conductivity, data can be attached by attaching the amorphous magnetic material sheets to both sides of the data carrier. The carrier can be directly attached to the metal surface using an adhesive or double-sided tape without distinguishing between the front and back.

[Submission date] December 19, 1991

[Procedure Amendment 1]

[Document name to be amended] Statement

[Name of item to be corrected] 0005

[Correction method] Change

[Correction content]

[0005]

[Problems to be solved by the device]

By the way, when using the data carrier by mounting it on a gas cylinder or a stainless steel barrel, there is a demand to mount it without protruding as much as possible from the mounting object, and the ferrite core used in the FA data carrier is expensive . However, there are low-price requirements, and to realize this, a data carrier with an induction coil without a core should be used.

[Brief description of drawings]

FIG. 1 is a block diagram of an embodiment of the present invention.

FIG. 2 is an explanatory view of the adhesive structure of FIG.

FIG. 3 is a block diagram of an embodiment showing another embodiment of the present invention.

FIG. 4 is an explanatory view of a conventional data carrier having a core.

FIG. 5 is an explanatory diagram of a conventional data carrier without a core.

[Explanation of symbols]

1: Data carrier 2: Induction coil (data carrier side) 3: Induction coil (reader / writer side) 5: Conductive object 6: Amorphous magnetic material sheet (amorphous magnetic material sheet) 7, 8: Adhesive 9: Magnetic flux 10: Conductive object 10a: Mounting surface 12: Molded body

Claims (3)

[Scope of utility model registration request] 1. A data carrier for performing writing or reading of a memory by performing communication or communication and power transfer by electromagnetic induction coupling with an external unit by an induction coil having no core, and the data carrier is made of metal or the like. A data carrier mounting structure for mounting on a conductive object, wherein a non-crystalline magnetic sheet is arranged between the conductive object and the data carrier. 2. The data carrier mounting structure according to claim 1, wherein the amorphous magnetic sheet and the data carrier are attached to the mounting surface of the conductive material by using an adhesive or a double-sided adhesive tape. Data carrier mounting structure characterized by that. 3. The data carrier mounting structure according to claim 1, wherein the amorphous magnetic sheet and the data carrier are integrally molded and attached to the conductive object. Construction.