JPH11238639A - Planar laminated coil and electromagnetic wave-readable ic sheet - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a planar laminated coil the spiral conductor pattern of, which is arranged conveniently for mounting electronic parts by constituting the parttern on a plurality of concentric and parallel spiral conductor patterns and connecting in series the conductor pattern of each layer in appropriate order. SOLUTION: In a second divisional area Se on the rear surface of a resin film 1, two concentric parallel spiral conductor pattern C221 and C222 are formed. Namely, a plurality of spiral conductor patterns are formed on the same surface. Then a planar laminated coil is constituted in such a three-layer structure, that when the film 1 is doubly folded, the front surface of the second divisional area S2 becomes a first conductor layer and the rear surface of the area S2 becomes a second conductor layer, and then the front surface of a first divisional area S1 becomes a third conductor layer. A terminal pad PD 2 is formed at the outer peripheral end section of the spiral conductor pattern C11 formed on the front surface of the first divisional area S1, and a front-rear conducting section TH41 is formed at the inner peripheral end section of the pattern C11.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flexible IC sheet suitable as a slip-integrated IC label which can be read in a non-contact manner using electromagnetic waves, and a flat type laminated sheet suitable as an antenna coil thereof. Regarding the coil, especially when the number of laminated conductor layers is odd, it is possible to arrange both ends of the antenna coil side by side on the inner peripheral side or the outer peripheral side of the spiral conductor pattern, thereby increasing the degree of freedom in design. The present invention relates to a flat laminated coil and an electromagnetic wave readable IC sheet using the same.

[0002]

2. Description of the Related Art In order to promote automation of physical distribution, it is important that the contents of slips and the like attached to individual articles and the like can be machine-readable. Conventionally, for this purpose, a bar code label corresponding to the content of each slip is attached to each slip.

[0003] However, in order to read a barcode label using a so-called barcode reader, a certain distance and directional relationship between the two must be established with extremely high precision, which hinders smooth distribution. Had become. In addition, since the amount of information that can be input to the barcode is relatively small, the physical distribution management using such a barcode label has a problem in that the distribution management range is limited to a narrow area. .

[0004] Therefore, development of a slip-integrated IC label that can be read in a non-contact manner using electromagnetic waves is currently underway. According to this slip-integrated IC label, since an electromagnetic field is used as a reading medium, there is not much restriction in distance and direction in reading,
Specifically, the contents can be reliably read even from a distance of 1 meter without being restricted by the reading directionality.

[0005] By the way, in order to realize a slip-integrated IC label that can be read in a non-contact manner by using such an electromagnetic wave, in order to increase the sharpness Q of an LC resonance circuit including an antenna coil, a considerable number of turns is required. Many planar coils are required. Accordingly, the applicant of the present application has previously filed Japanese Patent Application No. 9-312.
No. 586, a flat laminated coil capable of holding a sufficient number of coils in a flexible thin sheet and an electromagnetic wave readable IC sheet using the same have been proposed (not disclosed). I have.

An electromagnetic wave readable IC proposed earlier
An example of a sheet is shown in FIGS. still,
6 and 7, reference numeral 100 denotes a resin film, 1
00a is a laminate, A, B, C, and D are four corners of a rectangular resin film, L1 is a mountain fold line, L2 is a valley fold line, S1 is a first section area, S2 is a second section area, and C11 is a first section area. A spiral conductor pattern on the back surface of the first divided region; C12, a spiral conductor pattern on the back surface of the first divided region; C21, a spiral conductor pattern on the back surface of the second divided region; Is a window hole, and PD1 and PD2 are respectively 2 leading to the winding start end and winding end of the antenna coil.
One terminal pad, TH1 and TH2 are front and back conducting portions, and TP is a coil terminal.

[0007] The basic structure of an IC sheet capable of reading electromagnetic waves is such that electronic components are mounted on a flexible sheet holding an antenna coil. The flexible sheet holding the antenna coil is formed by dividing the resin film 100, which is divided at substantially equal intervals in one direction, into sections S.
A laminated body 1 that is folded in units of 1, S2 and laminated and integrated.
00a. On at least one side of each unit section of the resin film, the spiral conductor patterns C11, C12, C21,
C22 is formed. The spiral conductor patterns in each unit section are connected in series with each other by opening a predetermined connection portion so that an electric current flows in the same winding direction when folded, thereby forming an antenna coil. Two terminal pads PD respectively connected to the winding start end and winding end of the antenna coil
1 and PD2 are both arranged so as to be exposed on the same surface side of the laminate. The two terminal pads are juxtaposed outside or inside the spiral of the spiral conductor pattern in the unit section. The two terminal pads are arranged on the upper surface of the lowermost film piece when folded, and each of the upper film pieces is arranged on the upper surface of the lowermost film piece. A window hole H or a notch for exposing the two terminal pads thus formed to the upper surface side of the laminate is formed.

According to the slip-integrated IC sheet having such a structure, since a planar antenna coil having a four-layer print coil structure is built in, the inductance value (L) of the antenna coil and the sharpness value (Q) of the resonance circuit are set. The reading sensitivity can be improved through the increase in ()). In addition, the two terminal pads PD1 and PD2 respectively connected to the winding start end and the winding end of the antenna coil are both arranged so as to be exposed on the same surface side of the multilayer body 100a, and moreover, the two terminal pads PD1 and PD2 Are located close to the inner or outer circumference of the vortex,
When mounting electronic components thereon, there is also an advantage that labor such as through-hole processing is not required.

[0009]

However, in such a slip-integrated IC label according to the above proposal,
C11 and C11 are respectively assigned to the front and back of each of the divided areas S1 and S2.
As shown in FIG. 6B, a configuration in which spiral conductor patterns are arranged one by one as in C12 and C21 is adopted.
, Two terminal pads PD1 and PD2 respectively connected to the winding start end and the winding end of the antenna coil.
2 are arranged on the inner circumferential side or the outer circumferential side of the spiral conductor pattern, an even number of spiral conductor patterns are required. In the case of 7, four layers are required), and there is a problem that it is difficult to reduce the amount of the conductive metal foil constituting the conductor layer from the viewpoint of cost. Since an enormous amount of this type of slip-integrated IC label is expected to be used, it is necessary to respond to quite severe cost reduction requirements in order to put it into practical use. From this point of view, it is extremely important to reduce the amount of good conductive metal foil (copper foil, aluminum foil, etc.) used in the spiral conductor pattern. Simply from the viewpoint of an electric circuit, if the number of turns of the spiral conductive pattern is increased, the required number of stacked conductive layers is reduced accordingly. However, under the restriction that both the pair of terminal pads leading to the winding start end and the winding end of the coil are arranged on the inner peripheral side or the outer peripheral side of the spiral conductor pattern, the above-described electric circuit has the same meaning as described above. Irrespective of the number of stacked conductor layers (4 layers, 6 layers)
Layers, 8 layers ...).

The present invention has been made in view of the above-mentioned conventional problems, and has as its object to provide a pair of coil terminal pads, both of which are convenient for mounting electronic components. An object of the present invention is to provide a planar laminated coil which is arranged on the inner peripheral side or outer peripheral side of a spiral conductor pattern and which can be manufactured at low cost, and an IC sheet which employs the same and which can read electromagnetic waves.

[0011]

According to the first aspect of the present invention, there is provided a laminate comprising a plurality of planar substrates each having a conductor layer on one or both surfaces thereof, wherein the laminate comprises: A spiral conductor pattern is formed on each of the layers so that the spiral cores are aligned with each other, and the spiral conductor pattern formed on any one of the conductor layers is formed of a plurality of concentric and parallel spiral conductors. The planar laminated coil is constituted by a conductor pattern, and the spiral conductor patterns of each layer are connected in series in an appropriate order.

The invention described in claim 2 of the present application is
The number of stacked conductive layers is an odd number, and the number of conductive layers connected to both ends of the series-connected spiral conductive pattern is 1
2. The planar laminated coil according to claim 1, wherein the pair of terminal pads are both disposed on the inner peripheral side or the outer peripheral side of the spiral conductor pattern. 3.

The invention described in claim 3 of this application is
2. The flat laminate according to claim 1, wherein the laminate is formed by folding and laminating a resin film with a conductor layer, which is divided at substantially equal intervals in one direction, in a unit of division. 3. In the coil.

Further, according to the invention described in claim 4 of the present application, an electronic component is mounted on a flexible sheet holding an antenna coil, and the antenna coil is provided with any one of claims 1 to Item 4. An electromagnetic wave readable IC sheet, which is the planar type laminated coil according to any one of Items 3.

According to the present invention, the spiral conductor pattern formed on any one of the conductor layers is constituted by a plurality of spiral conductor patterns concentric and parallel to each other. Are sequentially connected so that a current flows in a direction that does not cancel out the magnetic field, so that the restriction on the total number of conductors in this type of planar laminated coil can be eliminated, and the degree of freedom in design can be significantly improved.

[0016]

Preferred embodiments of the present invention will be described below in detail with reference to the accompanying drawings.

As described above, the planar laminated coil according to the present invention is a laminate formed by laminating a plurality of planar substrates each having a conductor layer on one or both sides thereof. In each of the above, a spiral conductor pattern is formed by aligning the spiral cores with each other, and the spiral conductor pattern formed on any one of the conductor layers is formed of a plurality of concentric and parallel spiral conductors. The spiral conductor pattern of each layer is connected in series in an appropriate order.
Such a planar laminated coil can be applied to various uses. In this embodiment, the present invention is applied to the above-described IC sheet capable of reading electromagnetic waves. The basic configuration of an IC sheet that can read electromagnetic waves is such that electronic components are mounted on a flexible sheet holding an antenna coil. The flexible sheet holding the antenna coil is a laminate formed by folding and laminating a resin film, which is divided at substantially equal intervals in one direction, in a unit of division. A spiral conductor pattern is formed on at least one surface of each unit section of the resin film so that the vortices match when folded. Here, a particularly important point is that the spiral conductor pattern formed on the front surface or the rear surface of any of the unit sections is constituted by a plurality of concentric and parallel spiral conductor patterns. The spiral conductor pattern of each unit section is
The antenna coil is configured to be connected in series with each other via a predetermined connection portion so that current flows in the same winding direction when folded.

Such an electromagnetic wave readable IC sheet includes (1) the number of sections of a resin film, (2) the surface (one or both surfaces) on which the spiral conductor pattern is formed, and (3) a pair of terminal pads connected to the antenna coil. Various embodiments are further conceivable depending on how the arrangement (the inner peripheral side or the outer peripheral side) is determined.

One embodiment of the present invention is shown in FIGS. In this embodiment, the number of sections of the resin film is “2”, the formation surface of the spiral conductive pattern is “one side” for the first section area, “both sides” for the second section area,
Arrange the terminal pads connected to the antenna coil to "outer side"
It is what it was. Therefore, first, referring to FIGS. 1 to 5, the structure of a laminated body corresponding to an IC sheet holding an antenna coil will be clarified.

FIGS. 1 (a) and 1 (b) show the front and back surfaces of the resin film 1 before being folded in two. As is apparent from FIG.
(For example, a PET film having a thickness of 12 μm) is formed in an elongated rectangular shape, and the front and back surfaces thereof are divided into two divided regions (a first divided region S1 and a second divided region) with a mountain fold line L1 or a valley fold line L2 as a boundary. The area is almost equally divided into two areas S2). The symbols A, B, C, and D attached to the four corners of the resin film 1 clarify the relationship between the corresponding corners on the front surface and the back surface.

As shown in FIG. 1A, spiral conductor patterns C11 and C21 are adhered to the first and second divided areas S1 and S2 on the surface of the resin film 1, for example, on the surface of the film 1. It is formed by etching a 30 μm thick copper foil. Note that an insulating coating functioning as an etching mask is left on the surfaces of the conductor patterns C11 and C21.

On the other hand, the properties of the first and second divided areas S1 and S2 on the back surface of the resin film 1 are significantly different from the configuration according to the previous proposal shown in FIGS. . That is, the first on the back surface of the resin film 1
As shown in FIG. 1B, no conductor pattern exists in the segmented area S1. In other words, on this side,
In the manufacture thereof, it is not necessary to attach a conductive metal foil (copper foil, aluminum foil, etc.). On the other hand, two concentric and parallel spiral conductor patterns C221 and C2 are provided in the second section area S2 on the back surface of the resin film 1.
22 are formed. That is, unlike the previous proposals shown in FIGS. 6 and 7, a plurality of spiral conductor patterns are formed on the same surface.

Then, as shown in FIG. 2A, when the resin film 1 is folded in two along the mountain fold line L1 and the valley fold line L2, the surface of the second section region S2 becomes the first layer of the conductor layer. , The back surface of the second sectioned area S2 is the second layer of the conductor layer,
A planar laminated coil having a three-layer structure in which the surface of the first section region S1 is the third layer of the conductor layer is configured. 6 and 7 by appropriately designing the shape and the number of turns of the spiral conductor patterns C11, C21, C221, and C222.
It is easy to obtain the same inductance value (L) as that of the above structure.

More specifically, the first divided area S1
A terminal pad PD2 is formed on the outer peripheral end of the spiral conductor pattern C11 formed on the surface of the substrate, and a front-back conductive part TH41 is formed on the inner peripheral end. Similarly, the spiral conductor pattern C2 formed on the surface of the first divided region S2
The front and back conductive portion TH21 is formed at the outer peripheral end of the device 1, and the front and back conductive portion TH11 is formed at the inner peripheral end.

On the other hand, a terminal pad PD1 is provided on the outer peripheral end of the first spiral conductor pattern C221 formed on the back surface of the second divided area S2, and a front / back conductive portion T is provided on the inner peripheral end.
H12 is formed. Similarly, front and back conductive portions TH22 are formed at the outer peripheral end of the second spiral conductive pattern C222 formed on the back surface of the second divided region, and front and back conductive portions TH32 are formed at the inner peripheral end. ing. H is a cutout window for exposing the terminal pad PD1 formed at the edge of the first divided region S1.

The connection structure between patterns when the resin film 1 shown in FIGS. 1A and 1B is folded in two will be described with reference to FIGS. 3 and 4. FIG. The front / back conduction portion TH11 formed on the front surface of the second sectioned region and the front / back conduction portion TH12 formed on the back surface thereof are formed by, for example, spot resistance welding previously proposed by the present applicant in Japanese Patent Application No. 8-357127. The connection is made conductive by applying. That is, in this spot resistance welding, first, FIG.
As shown in (a), the front and back conductive portions TH11, TH1
2 is sandwiched from above and below by the heated indenters 2a and 2b, whereby the front and back conductive portions TH1
1, the resin film 1 sandwiched between TH12 is melted and removed. Next, as shown in FIG. 3B, by energizing between the indenters 2a and 2b, the front-back conduction portion TH11 and the front-back conduction portion TH12 are instantaneously welded. Similarly, the front-back conduction part TH21 formed on the front surface of the second divided region and the front-back conduction part TH formed on the back surface thereof
At 22, the connection is conducted by the method shown in FIG. 3.

On the other hand, the front and back conduction portion TH32 formed on the back surface of the second division region S2 and the front and back conduction portion TH41 formed on the surface of the first division region S1 are formed by the resin film 1
After being folded in half, the connection is conducted by applying a similar spot resistance welding, as shown in FIG. That is, as shown in FIG. 4A, in a state where the resin film 1 is folded in two, when the laminate is sandwiched between the indenters 3a and 3b heated from above and below, the first film existing between them The resin film 1 in the divided area S1 and the second divided area S2 is heated and melted and removed as shown in FIG. Thereafter, if current is applied between the indenters 3a and 3b, the front and back conduction part TH41 and the front and back conduction part TH32 are instantaneously welded to establish connection conduction, as in the previous example. In addition, P shown in FIG. 1 (b) indicates a molten portion of the resin film.

The front and side cross sections of the laminated body 1a thus folded in two and connected and connected are shown in FIG.
2 (c). As is clear from these figures, a pair of terminal pads PD1 and PD2 corresponding to the winding start and end of the planar laminated coil are exposed on the same surface of the laminate 1a, and both of them are spirally wound. It is arranged close to the outer peripheral side of the conductor pattern. Therefore, as shown in FIG. 5, the electronic component 4 can be easily mounted by using the terminal pads PD1 and PD2 and using solder or a conductive adhesive.

Incidentally, four spiral patterns are connected between the terminal pads PD1 and PD2 in the following order. Terminal pad PD1 → spiral conductor pattern C221 →
Front and back conduction part TH12 → front and back conduction part TH11 → spiral conductor pattern C21 → front and back conduction part TH21 → front and back conduction part TH
22 → spiral conductive pattern C222 → front and back conductive part TH3
2 → front and back conducting part TH41 → spiral conductor pattern C11 →
Terminal pad PD2.

The effects of the above-described embodiment are summarized as follows.

(1) Since the odd-numbered layers can be multilayered, the degree of freedom in designing the multilayer antenna coil can be improved.

(2) It is possible to optimize necessary coil characteristics such as L value and Q value and material cost.

(3) In the case of four or more even-numbered layers, the surface on which the spiral conductor pattern is formed and the surface on which the spiral conductor pattern is formed face each other. However, in the case of an odd-numbered layer such as three layers, since the spiral conductor patterns do not face each other, it is not necessary to form an additional insulating layer.

(4) Positioning of the double-sided coil sheet forming the first and second layers and the single-sided coil sheet forming the third layer can be realized very easily and accurately.

Although the above embodiment has been described in connection with the case where the number of the conductor layers is three, the present invention is not limited to the case where the number of layers can be increased to more than five, seven or nine. Needless to say, even in such a case, an optimum design can be achieved by forming two or more concentric and parallel spiral conductor patterns in any one of the multilayered layers.

As described above, according to the present embodiment, a very simple configuration in which two or more concentric spiral patterns are formed in one of the conductor layers to be multi-layered enables the required coil characteristics to be reduced. As a result, the optimum number of conductor layers can be appropriately selected, and the degree of design freedom in this type of planar laminated coil can be significantly improved. That is, even when the pair of terminal pads PD1 and PD2 are both juxtaposed on the inner circumferential side or the outer circumferential side of the spiral conductive pattern, the restriction of the number of stacked conductive layers to be an even number is avoided. Therefore, for example, as shown in the embodiment, four spiral conductor patterns C11, C21, C2
21 and C222 are connected to the conductor layer 3
This can be realized with a layer structure, and the cost can be reduced by saving the conductor layer.

[0037]

As is apparent from the above description, according to the present invention, a flat laminated coil which can be easily mounted on an electronic component and can be manufactured at low cost, and an electromagnetic wave readable using the same. An IC sheet can be provided.

[Brief description of the drawings]

FIG. 1 is a diagram showing a front surface and a back surface of an IC sheet capable of reading electromagnetic waves according to an embodiment of the present invention in a developed state.

FIG. 2 is a diagram illustrating a method of folding the IC sheet, a front view of the folded state, and a cross section.

FIG. 3 is an explanatory view showing an example of a method of joining the front and back conductive portions.

FIG. 4 is an explanatory diagram showing an example of a method of joining the front and back conductive portions.

FIG. 5 is a perspective view schematically showing the appearance of an electromagnetic wave readable IC sheet according to the present invention in a completed state.

FIG. 6 is a diagram showing a front surface and a back surface of a conventional IC sheet capable of reading electromagnetic waves in a developed state.

FIG. 7 is a view showing a method of folding the conventional IC sheet, a front view of the folded state, and a cross section.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Resin film 1a Laminated body 2a, 2b, 3a, 3b Indenter 4 Electronic component A, B, C, D Four corners of resin film S1 1st division area S2 2nd division area S3 3rd division area S4 4 sectional areas C11 spiral conductive pattern on the surface of the first sectional area C21 spiral conductive pattern on the surface of the second sectional area C221 first spiral conductive pattern on the back of the second sectional area C222 second spiral on the back of the second sectional area Conductor pattern TH11, TH12, TH21, TH22, TH32,
TH41 Front and back conduction part PD1, PD2 Terminal pad H Notch window P Resin fusion part

Claims (4)

[Claims] 1. A laminate formed by laminating a plurality of planar base materials having a conductor layer on one or both sides, wherein a vortex is aligned with each of the conductor layers,
A spiral conductor pattern is formed, and the spiral conductor pattern formed on any one of the conductor layers is constituted by a plurality of spiral conductor patterns concentric and parallel to each other. The planar laminated coil, wherein the conductor patterns are connected in series in an appropriate order. 2. A pair of terminal pads electrically connected to both ends of the series of spirally-connected conductor patterns connected in series, wherein the pair of terminal pads is an odd number. 2. The planar laminated coil according to claim 1, wherein the coil is disposed on an inner side or an outer side. 3. The laminate according to claim 1, wherein the laminate is formed by folding and laminating a resin film with a conductor layer, which is divided at substantially equal intervals in one direction, in unit of division. A planar laminated coil as described in the above. 4. A flat laminated coil according to claim 1, wherein an electronic component is mounted on a flexible sheet holding an antenna coil. An electromagnetic wave readable IC sheet, characterized in that: