JP2000223930A - Coil device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To actualize a coil device which well comply with deformation, etc. SOLUTION: The coil device which has coils 2 and a base body 1 holding them has the coils 2 separated from each other and a flexible member is used for the base body 1. Consequently, the device not only deforms mechanically in compliance with changes of the use state such as deformation and expansion, but also is adaptive as an electromagnetic circuit almost without adjustment. Further, the device is suitable to a transmission cable by providing coils 2 in array.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a coil device having a plurality of coils, and more particularly, to a coil device for transmitting a signal based on mutual induction. Such a coil device is particularly suitable for members such as a magnetic sensor, an antenna unit, and a signal transmission unit.

[0002]

2. Description of the Related Art In non-contact communication and sensing, a coil device such as an antenna coil is often used to receive and detect a magnetic signal and an electromagnetic signal. For example, a reader or writer that reads data or the like from an IC card in a non-contact manner is a typical application example.
And, by arranging a plurality of coils connected in parallel,
A non-contact card reader in which the directivity of an antenna is improved is also known (JP-A-8-27919).

[0003]

However, such a conventional coil device cannot cope with a sudden installation request or a change in the use mode. Or it was hard to deal with. For example, in order to extend the communication range, it is necessary to add or replace a plurality or a large number of coils as in the above-described example. And so on, so you can't do it easily. In addition, when the number of antenna coils connected in parallel increases or decreases, the load state changes, so that it is necessary to perform matching for tuning again. For this reason, the transmission / reception circuit and the like are affected, so that it cannot be easily increased or decreased.

Therefore, it is a technical problem how to easily adapt to various use situations.
The present invention has been made to solve such a problem, and an object of the present invention is to realize a coil device having excellent adaptability to deformation and the like.

[0005]

Means for Solving the Problems First to eighth solving means invented to solve such problems are as follows.
The configuration and operation and effect will be described below.

[First Solution] A coil device according to a first solution (as described in claim 1 at the beginning of the application) is a coil device comprising a plurality of coils and a base holding these coils. , The coils are separate from each other;
The base is made of a flexible member.

In the coil device according to the first solution, in addition to one of the plurality of coils acting as an antenna, each of the remaining coils transmits a signal based on mutual induction. Therefore, reception and detection of magnetic signals and electromagnetic signals can be performed in a wide range. Moreover, even if there are multiple coils, they are separated without being connected in parallel,
Even if the number of coils included in the coil device increases or decreases, the tuning characteristic is maintained substantially constant.

Further, since the base can be easily deformed by bending or bending based on the flexibility of the base, it can be used in various situations. In addition, since the lead wire is not connected to the separately provided coil, the lead wire connecting portion does not break even when bent. Further, even if the base is cut between the coils, the signal transmission function and the like are not impaired, so that it is easy to adjust the shape and the like on site.

As a result, not only is it mechanically well-adapted to changes in usage conditions such as deformation and expansion,
The electromagnetic circuit is well adapted with little adjustment. Therefore, according to the present invention, it is possible to realize a coil device excellent in adaptability to deformation and the like both mechanically and circuitically.

[Second Solution] The coil device of the second solution (as described in claim 2 at the beginning of the application) is the coil device of the first solution, wherein the coil is They are arranged in rows.

[0011] In the coil device of the second solution, the magnetic signal and the coil are arranged along the row of the coil in the row.
Electromagnetic signals propagate. Such a coil device is suitable for use as a transmission cable. Therefore, according to the present invention, it is possible to realize a coil device excellent in adaptability to deformation and the like, which is suitable for use as a transmission cable.

[Third Solution] The coil device of the third solution (as described in claim 3 at the beginning of the application) is the coil device of the second solution, wherein The number of turns increases or decreases in the order of the rows.

In the coil device according to the third aspect, when a magnetic signal or an electromagnetic signal propagates in a direction in which the number of turns of the coil increases when the magnetic signal or the electromagnetic signal propagates through each coil, an induction is caused accordingly. The voltage also rises. This makes it possible to easily suppress signal attenuation accompanying propagation by simply selecting the direction in which the number of coil turns increases or decreases when installing the coil device or the like. Therefore, according to the present invention, it is possible to realize a coil device having excellent signal transmission characteristics in addition to adaptability to deformation and the like.

[Fourth Solution] The coil device of the fourth solution (as described in claim 4 at the beginning of the application) is the coil device of the first to third solutions described above, The base has a recess formed at the surface of the portion located between the coils.

In the coil device according to the fourth solution, when adjusting the length or the like, the recess is cut. This is convenient because the dent serves as a measure of cutting and the coil device can be appropriately formed without damaging the coil. Therefore, according to the present invention, it is possible to realize a coil device that is excellent in adaptability to deformation and the like and that can easily be deformed.

[Fifth Solution] The coil device of the fifth solution (as described in claim 5 at the beginning of the application) is the coil device of the fourth solution, wherein Has a non-connecting portion formed inside the recess.

In the coil device according to the fifth solution, the entire surface is cut off simply by cutting the surface of the concave portion serving as a guide into a shallow depth. This allows the cutting
It's easy and quick, with no effort. Therefore,
ADVANTAGE OF THE INVENTION According to this invention, the coil apparatus excellent in adaptability to deformation | transformation etc. which is easy to cut can be implement | achieved.

[Sixth Solution] The coil device of the sixth solution (as described in claim 6 at the beginning of the application) is the coil device of the first to fifth solutions described above, The base includes a separate insertion member and a continuous mantle member.

The coil device according to the sixth aspect of the present invention is manufactured by packing an inner member into an outer member. As a result, a coil device can be easily completed even without a large-scale and complicated manufacturing facility. Therefore, according to the present invention, it is possible to realize a coil device which is excellent in adaptability to deformation and the like and which is easy to manufacture.

[Seventh Solution Means] The coil device of the seventh solution means (as described in claim 7 at the beginning of the application) is the coil device of the first to third solution means, The substrate is formed in a film shape.

In the coil device according to the seventh solution, the coil device is deformed without breaking even if it is bent or twisted. TAB (Tape Automated Bonding) and F
It can also be manufactured using a film wiring technology such as a PC. As a result, it is possible to reliably adapt to the application location and the installation location, and also to mass-produce at low cost. Therefore, according to the present invention, it is possible to realize a coil device excellent in adaptability to deformation and the like, which has high deformability and high mass productivity.

[Eighth Solution] The coil device according to the eighth solution (as described in claim 8 at the beginning of the application) is the coil device according to the first to seventh solutions, A plurality of magnetic films are provided, which are separately provided corresponding to the coils.

In the coil device according to the eighth aspect, since the magnetic resistance in the magnetic path around each coil decreases due to the presence of the magnetic film, the mutual inductance between the coils increases. As a result, the magnetic signal
The ability to propagate electromagnetic signals will be enhanced. Therefore, according to the present invention, it is possible to realize a coil device that is excellent in signal propagability in addition to adaptability to deformation and the like.

[0024]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Specific embodiments for implementing the coil device of the present invention achieved by such a solution will be described with reference to first to sixth embodiments. FIG.
The first embodiment shown in FIG. 2 embodies the first to third solutions described above, and the second embodiment shown in FIG.
The third embodiment shown in FIG. 3 embodies the first to sixth solutions described above, and the third embodiment shown in FIG. 3 embodies the seventh solution described above, and the fourth embodiment shown in FIG. The fifth embodiment shown in FIG. 5 and the fifth embodiment all embody the eighth solution means described above, and the sixth embodiment shown in FIG. 6 is an application example in which a plurality of the above-mentioned solutions are combined.

[0025]

First Embodiment A first embodiment of a coil device according to the present invention will be described with reference to the drawings. 1 (a) is a side view, FIG. 1 (b) is an end view, and FIG. 1 (c) is a perspective view.

This coil device is composed of a single round bar-shaped base 1.
In this state, a large number of coils 2 are embedded at equal intervals, and the substrate 1 is made of a plastic such as polyimide or polystyrene, which has flexibility in addition to excellent insulation properties, or the flexibility thereof. A material mixed with plastic rubber or the like is used to increase the height. The coil 2 is formed by winding an insulated electric wire such as an enameled copper wire by a coil winding machine or the like and then impregnating with a glue adhesive to form an annular shape. Both ends of each coil 2 are connected to each other, and each coil 2 is individually closed without being connected to another coil or the like. Such a coil device is provided with a plurality of coils separated from each other and a flexible base for holding these coils.

The coil device (1) is manufactured continuously, for example, by continuously inserting the coil 2 and solidifying it successively while continuously pouring the substrate 1 melted to an appropriate viscosity into the inclined tube. . At that time, the annular coil 2 is supplied such that the center axis thereof matches the axis of the base 1 as much as possible and the interval between the front and rear coils 2 is the same. Also, several types of coils 2 having different numbers of turns are prepared, and when the coil 2 is inserted into the base 1, when a certain range is viewed, the coils 2 are supplied in an order of increasing the number of turns or the number of turns is decreased. Are supplied in a proper order. And it is provided after being cut at the point where the increase or decrease of the number of turns is reversed. Thereby, this coil device is such that the number of turns of a large number of coils arranged in a row increases or decreases in the order of the rows.

The usage and operation of the coil device of the first embodiment will be described with reference to the drawings. FIG.
FIG. 1D is a simplified perspective view of a physical distribution system in which the reader 3 reads the data of the article tag 4 in a non-contact manner, and FIG.
(F) and (f) show a state in which the above-described coil device is introduced into the system to cope with a change in the article to be handled.

In this system, in order to contactlessly read data such as a delivery destination from an article tag 4 attached to a delivery item 5 carried on the belt conveyor 6, a reader 3 is provided near the belt conveyor 6. And the above-described coil device (1) is incorporated in the transmitting / receiving antenna section of the reader 3. At this time, the other end and the rear end of the coil 2 having a large number of turns are attached to the reader 3 while the other end and the rear end of the coil 2 having a small number of turns protrude out of the housing of the reader 3. Connected to the side.

Then, (see FIG. 1D), a delivery item in which the coil device (1) and the article tag 4 face each other at a short distance with the tip of the base 1 extending horizontally from the antenna position of the reader 3. 5 flows on the belt conveyor 6, and when both coils enter a range where electromagnetic coupling is possible, energy or energy is transmitted from the reader 3 via the coil device (1) based on an appropriate communication method such as FSK or PSK. The command is transmitted, and data or the like is returned from the coil of the article tag 4 receiving the command.

The reply is made by an active method of transmitting magnetic signals or electromagnetic signals of different frequencies, a passive method of changing the load state of the coil, or the like. Is the coil 2 on the tip side of the base 1
, Which in turn propagates through the coil 2 in accordance with the mutual inductance and reaches the rear end of the base 1,
Finally, the signal is input to a receiving circuit inside the reader 3.

Thus, non-contact communication is performed.
In this case, since the coil device (1) protrudes from the reader 3, even if the reader 3 is set slightly away from the belt conveyor 6, the tip of the coil device (1) can surely approach the article tag 4. . In addition, when a signal propagates through the base 1, the induced voltage induced in each coil 2 from the front end to the rear end does not readily decrease or increases, so that the signal from the article tag 4 with low power is generated. Even the signal is transmitted to the reader 3 by the coil device (1) more reliably.

Further, even when the kind or shape of the delivery goods 5 to be handled is changed or diversified, and the height of the part to which the article tag 4 is attached is changed, the reader 3 itself is remodeled, This can be dealt with without recreating the installation environment (see FIGS. 1E and 1F).
For example, when an appropriate fixed support 3a or movable support 3b is extended from the reader 3 or the like and the tip of the coil device (1) is attached to the tip or the like and the delivery item 5 with the high attachment position of the article tag 4 is handled ( 1 (e)), movable column 3
The tip of the coil device (1) is lifted up to the height of the article tag 4 by, for example, sliding b upward.

On the other hand, when the delivery item 5 to which the article tag 4 is attached at a low position is handled (see FIG. 1F), the tip of the coil device (1) is also moved by sliding the movable support 3b downward. Is lowered to a height corresponding to the article tag 4. In this way, it is possible to easily adapt to various use situations simply by performing a simple operation that can be performed in addition to the on-site work without performing a difficult operation such as a design change or a remodeling of the reader 3.

[0035]

Second Embodiment A specific configuration of a coil device according to a second embodiment of the present invention will be described with reference to the drawings. 2 (a) to 2 (c) are an end view and a side view of each of the members 11 to 13 which are configured by dividing the base 1. FIG.
(D), (e) is a side view about the state which assembled them.

The difference between this coil device and that of the first embodiment is that the base 1 has a thin disk-shaped insertion member 11 (see FIG. 2A) enclosing the coil 2 and one end surface. Is substantially the same diameter as the end face of the insertion member 11 and the other end face is formed to have a smaller diameter than the insertion face of the insertion member 12 (FIG. 2).
(Refer to FIG. 2B) and a cylindrical outer jacket member 13 (refer to FIG. 2C) whose inner diameter is slightly larger than them. The insertion member 11 and the insertion member 12 may be made of the same material as that of the base 1 of the first embodiment described above, but the mantle member 13 is made of a flexible member having a shrinking deformation function such as a heat shrinkable plastic. Used.

In such a coil device, the base 1 includes the separated insertion members 11 and 12 and the continuous outer member 13. The production is performed by packing the insertion members 11 and 12 into the lumen of the outer cover member 13 (see FIG. 2D). 12 and then insert member 11
Is inserted, and another insertion member 12 is inserted with the large-diameter end face first. When inserting the insertion member 11, the selection of the insertion member 11 is performed in an order in which the number of turns of the coil 2 increases or in an order in which the number of turns decreases. Then (see FIG. 2 (e))
When the stuffing is completed to a sufficient length, a predetermined heat treatment or the like is performed to shrink the mantle member 13.

Thus, the coil device includes a plurality of coils 2 separated from each other and a flexible base 1 (= 11 to 13) for holding these coils. It is as if the number of turns increased or decreased in the order of the rows. Further, since the small-diameter end face of the insertion member 12 is narrowed, the base 1 is one in which the recesses 1a are formed at regular intervals on the surface of the portion located between the coils 2 (FIG. 2 ( e)). In addition, since the small-diameter end faces of the insertion member 12 are opposed to each other but are not bonded thereto, the base 1 has a non-connection portion formed inside the recess 1a.

Since the coil device of the second embodiment is manufactured in such a manner, it can flexibly meet various demands from small-scale production to mass-production, and its use mode and operation are substantially the same as those of the second embodiment. It is the same as in the first embodiment, but the cutting operation prior to use is simplified. That is, (see FIG. 2 (f)), when cutting this coil device (1) to a desired length, select an appropriate dent 1a, and lightly press a blade such as a cutter onto the coil device (1). ) Is rotated once around the axis.

Then, the mantle member 13 corresponding to the surface layer
Just cut into the core, without having to cut deep into the core
The coil device (1) is completely disconnected. In addition, since the shape of the cut end is defined by the insertion member 12, there is no concern that the coil 2 is exposed, and the signal transmission characteristics are stable and constant.

[0041]

Third Embodiment A specific configuration of a third embodiment of the coil device according to the present invention will be described with reference to the drawings. FIG. 3A is a front view, and FIG. 3B is a side view. This coil device is provided with a plurality of coils 2 separated in a line and a flexible base 1 for holding them, as in the above-described respective examples. Are different.

That is, the base 1 is formed in a film shape by cutting a wide sheet into a predetermined width or extending it into a tape shape by continuous molding or the like. The coils 2 are formed by a wiring pattern or the like printed on the surface of the base 1, and are arranged in a horizontal line on a flat surface. In order to secure a stable mutual inductance with the adjacent coil 2, the coil 2 is formed into a square shape such as a square or a rectangle. When the number of turns is two or more, the diameter or side length gradually changes due to a spiral wind. , Both ends are connected at the back surface or the intermediate layer.

Such a coil device employs a tape manufacturing technology of the TAB technology and an F-type technology utilizing a printed wiring technology.
It is mass-produced and provided at low cost using PC manufacturing technology and the like. Although illustration is omitted, for insulation and protection,
An appropriate thin protective film is attached to the surface of the base 1 from above the coil 2.

The usage and operation of the coil device according to the third embodiment will be described with reference to the drawings. FIG.
(C) is a front view of a device in which the coil device (1) is incorporated in the reader 3, and (d) of FIG.
FIG. 2 is a longitudinal sectional side view of a system embedded and installed in a vehicle. Note that the reader 3 is a device for reading user data or the like without contact from an entrance certificate 8 made by applying an IC card.

In this case, the base 1 is attached to the front panel of the reader 3 in a vertically long state, and the center coil of the several coils 2 arranged in a vertical line thereby becomes the transmission / reception antenna 3c of the reader 3. Position adjustment is also performed so as to perform electromagnetic coupling. At that time, the coil device (1)
Can be easily formed simply by cutting with scissors or a knife. Further, when the reader 3 is attached to the wall 7, the upper and lower ends of the base 1 protruding from the surface panel of the reader 3 are attached to the surface of the wall 7.

When the user is a tall adult or the like, the entrance certificate 8 to be read by the reader 3 is brought close to the upper coil 2, and when the user is a short child or the like. Brings such a primer 8 closer to the lower coil 2. In either case, when the two coils are within the range where electromagnetic coupling is possible, energy and instructions are transmitted from the reader 3 via the coil device (1) based on an appropriate communication method, and the entry certificate 8 receiving the energy and instructions is received. Data and the like are returned from the coil. The reply is that the magnetic signal causes an induced current in the coil 2 closest to the entry certificate 8, which in turn propagates through the coil 2 according to the mutual inductance and the substrate 1
To the coil 2 almost at the center, and finally the antenna 3c
Is input to the receiving circuit inside the reader 3 via the.

Thus, also in this case, non-contact communication is performed. In addition, a communicable area is secured over a wide range from a high place to a low place. Also,
If you want to secure a communication area in a horizontal or diagonal direction,
It is only necessary to change the direction of the coil device (1) so that its longitudinal direction matches the desired direction.

[0048]

Fourth Embodiment A fourth embodiment of the coil device according to the present invention will be described with reference to the drawings. 4A is a front view, FIG. 4B is a side view, and FIG. 4C is a rear view.

This coil device is an improvement of the above-described third embodiment, and a magnetic film 21 is added to the back surface of the base 1 in order to increase the propagation ability of a magnetic signal or the like. The magnetic film 21 is formed by mixing ferrite powder or the like having a high magnetic permeability into an adhesive or the like, and the center of the magnetic film 21 is on the back surface of the base 1 opposite to the side where the coils 2 are adjacent to each other. It is formed in a rectangular shape. At this time, a certain gap is secured between any of the magnetic films 21 and the adjacent one. Thus, the plurality of magnetic films 21 are separately provided corresponding to the coil 2. In this case, a protective film covering the magnetic film 21 is also attached to the back surface of the base 1.

The manner of use and operation of such a coil device are substantially the same as those of the third embodiment described above, and a detailed description thereof will be omitted. Since the magnetic path extending over the magnetic path is concentrated, the communicable range is further extended.

[0051]

Fifth Embodiment A specific configuration of a fifth embodiment of the coil device according to the present invention will be described with reference to the drawings. FIG. 5 shows three types of modified examples based on the second embodiment described above, and FIGS. 5A to 5C all correspond to FIG. 2A. 3A, the magnetic film 21 is embedded in the inside of the insertion member 11, and in FIG. 2B, the magnetic film 21 is one end face of the insertion member 11. And (c) the magnetic film 21
Are formed on both end surfaces of the insertion member 11.
In addition, while those of (a) and (b) are round,
(C) is square.

By using such an insertion member 11, even in a rod-shaped coil device corresponding to that of the second embodiment, a plurality of magnetic films 21 are separately provided corresponding to the coils 2. Can be embodied. Also in this case, the interposition of the magnetic film 21 enhances the ability to propagate a magnetic signal or the like over the many coils 2 arranged in a row.

[0053]

Sixth Embodiment A specific configuration of a coil device according to a sixth embodiment of the present invention will be described with reference to the drawings.

FIG. 6 (a) shows a substantially cross-shaped portion formed by developing six rectangular parallelepiped surfaces from a wide sheet in which a large number of coils 2 are arranged in a matrix on the surface of a film-like substrate 1. Is cut out. 6 (b) shows a case where the film-like substrate 1 of FIG. 6 (a) is assembled in a box shape and used for the three-dimensional antenna portion A, and the coil device (1) of FIG. 1 or FIG. Is used for a signal transmission section B between the antenna section A and the reader 3.

By appropriately combining the planar coil device and the rod-shaped coil device in this manner, various areas can be communicated in a wide range, and restrictions on the installation of the communication device main body and the like are alleviated. Will be done.
In addition, the electrical connection between the antenna unit A and the signal transmission unit B and the electrical conduction between the signal transmission unit B and the reader 3 need not be established during the assembly, so that the assembly operation is simple.

[0056]

[Others] The graph shown in FIG. 7 shows the tuning characteristics of the coil 2 in the above-described coil device. The horizontal axis represents the frequency, and the vertical axis represents the same power and different magnetic signals with the same power but different frequencies. The current value flowing through the coil 2 at this time is taken. Its characteristics are determined based on the parasitic capacitance due to the dielectric constant and shape of the base 1 and the Q and the like of the coil 2, but have a peak width corresponding to the frequency band of the carrier used for communication. ing. The material and shape of the base 1 are devised so that a small-capacity capacitor is explicitly added if necessary.

Such a tuning characteristic hardly changes even if the coil device is subjected to a deformation process such as cutting, extension or bending, so that any of the above-described coil devices has the same characteristics as the reader 3 or the like. It is not necessary to re-tune the transmission / reception circuit of the reader 3 when incorporating it into the device or when modifying or rearranging the device after assembling. Even if it is adjusted, fine adjustment is sufficient.

In the first and second embodiments,
Although the shape of the base 1 or the whole is rod-shaped, the shape is not limited thereto, and the shape may be any shape such as a tube, a pipe, a spiral, and may be straight or bent. good. The shapes of the coil 2 and the magnetic film 21 are not limited to the circles and squares shown in the fourth and fifth embodiments.
Rings, polygons such as hexagons, discs with variable thickness, etc.
Any suitable one may be used. Further, the mantle member 13 is not limited to the heat-shrinkable material shown in the second embodiment, but may be a material having shrinkage due to another action such as a chemical reaction.

[0059]

As is apparent from the above description, in the coil device according to the first solution of the present invention, deformation and expansion are performed on the basis of the combination of the separability of the coil and the flexibility of the base. A coil device that excels in adaptability to deformation, etc. by not only being mechanically well-adapted and deforming to changes in usage conditions, etc., but also being adjusted well with little adjustment as an electromagnetic circuit. Has the advantageous effect of being able to achieve

In the coil device according to the second solution of the present invention, an electromagnetic signal or the like is propagated along the array of coils, so that the coil device has excellent adaptability to deformation and the like. There is an advantageous effect that a device suitable for use as a transmission cable can be realized.

Further, in the coil device according to the third solving means of the present invention, the signal attenuation accompanying the propagation is suppressed only by selecting the direction of increase or decrease of the number of turns of the coil, so that deformation to the deformation or the like is suppressed. There is an advantageous effect that a coil device excellent in signal transmission characteristics in addition to compatibility can be realized.

Further, in the coil device according to the fourth solution of the present invention, the coil device can be cut without damaging the coil by using the recess as a guide, so that the coil device can be adapted to deformation and the like. An advantageous effect is obtained in that an excellent coil device that can be easily deformed itself can be realized.

Further, in the coil device according to the fifth solution of the present invention, the whole is cut off by merely cutting the guide at a small depth, so that the coil device is excellent in adaptability to deformation and the like. However, there is an advantageous effect that an easy-to-cut one can be realized.

In the coil device according to the sixth aspect of the present invention, the coil device is completed by, for example, stuffing an insertion member into a jacket member, so that adaptability to deformation and the like is improved. There is an advantageous effect that an excellent coil device which can be easily manufactured can be realized.

The coil device according to the seventh aspect of the present invention can be manufactured by a film wiring technique or the like, so that the coil device has excellent adaptability to deformation and the like. There is an advantageous effect that a high performance and high mass productivity can be realized.

Further, in the coil device according to the eighth solution of the present invention, the mutual inductance between the coils is increased, so that not only the adaptability to deformation and the like, but also the signal propagation is excellent. This has the advantageous effect that the coil device can be realized.

[Brief description of the drawings]

FIG. 1 is a side view and the like of a first embodiment of a coil device of the present invention.

FIG. 2 is a side view and the like of a second embodiment of the coil device of the present invention.

FIG. 3 is a front view of a coil device according to a third embodiment of the present invention.

FIG. 4 is a front view of a coil device according to a fourth embodiment of the present invention.

FIG. 5 is an end view and the like of a fifth embodiment of the coil device of the present invention.

FIG. 6 is a development view and the like of a sixth embodiment of the coil device of the present invention.

FIG. 7 is a diagram showing tuning characteristics of each coil device of the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Substrate (rod, cylinder, round, square material) 1a Depression 2 Coil (insulated conductor winding, printed loop-shaped wiring pattern) 3 Reader (applied device incorporating coil device, communication device) 3a Fixed Support (member supporting part or all of the coil device) 3b Movable support (member supporting part or all of the coil device) 4 Article tag (IC card, partner communication device) 5 Delivery 6 Belt conveyor 7 Wall ( 8 A member who supports part or all of the coil device. 8 Introductory certificate (IC card, partner communication device) 11 Insertion member (large-diameter insertion member containing coil) 12 Insertion member (insertion between coils) 13 The diameter of the member changes. 13 Mantle member (contractible cylinder) 21 Magnetic film (magnetic thin film)

Claims (8)

[Claims] 1. A coil device comprising a plurality of coils and a base for holding the coils, wherein the coils are separated from each other, and the base is made of a flexible member. Coil device. 2. The coil device according to claim 1, wherein said coils are arranged in a row. 3. The coil device according to claim 2, wherein the number of turns of the coil increases or decreases in a row. 4. The coil device according to claim 1, wherein the base has a recess formed on a surface of a portion located between the coils. 5. The coil device according to claim 4, wherein the base has a non-connection portion formed inside the recess. 6. The coil device according to claim 1, wherein the base comprises a separate insertion member and a continuous mantle member. 7. The coil device according to claim 1, wherein the substrate is formed in a film shape. 8. The coil device according to claim 1, further comprising a plurality of magnetic films separately provided corresponding to the coil.