JP2016111076A - Coil and active magnetic stripe card - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a coil which can be formed like a sheet, and can generate a magnetic field of large intensity on one surface thereof.SOLUTION: In a coil L, the unit winding has a sheet-like conductor 21, and a rudder-like conductor 24 where the opposite ends of a plurality of conductor lines 31 arranged in parallel with each other along a surface facing the sheet-like conductor 21, and one end Fof the sheet-like conductor 21 and one end Gof the rudder-like conductor 24 are connected with each other.SELECTED DRAWING: Figure 5

Description

  The present invention relates to a coil and an active magnetic stripe card that generates magnetism using the coil.

  Many magnetic stripe cards such as credit cards and various point cards are prevalent. A magnetic stripe card has a structure in which a magnetic tape is attached to a plastic card, and personal information is recorded on the magnetic tape. To read the record, a reader (magnetic card reader) having a magnetic head is used, and information is read by sliding the head portion so as to rub the magnetic tape.

  As described above, there are a variety of magnetic stripe cards, and it is bulky to carry all the various cards, and there is a problem that convenience is poor. In addition, there is a risk that information can be easily read from the card, such as when it is stolen.

  Therefore, a method has been proposed in which a coil is arranged instead of a magnetic tape, a current is passed through the coil only when the card is used, and information is read into the magnetic head by a current magnetic field. The card has a wireless communication function, and data for each card is transmitted from a mobile device such as a smartphone (multi-function mobile phone) or tablet computer at the time of use. It is also possible to improve the convenience. Also, with this method, information is not recorded on the card itself, so that information cannot be read from the card even if it is stolen, and safety is extremely high. Such a card may be referred to as an active (dynamic) magnetic stripe card, a multi-magnetic stripe card, or a variable magnetic card.

  Patent Document 1 describes a magnetic stripe card in which three coils are formed by winding a material such as a soft magnetic material around a portion corresponding to each of three tracks of the magnetic stripe.

  Patent Document 2 describes a magnetic stripe card having a structure in which a coil is wound around a strip-shaped magnetic ribbon corresponding to a magnetic stripe and attached to a card.

Special table 2013-543605 gazette Special table 2010-510603

  Magnetic stripe cards are classified into international standards and domestic standards. In order to comply with both, magnetic stripe cards that are widely used in Japan are attached with separate magnetic tapes on the front and back sides. In the coil structure of Patent Document 1, the same current magnetic field is generated on both the front and back surfaces of the card, and both standards cannot be satisfied.

  Even in the coil structure of Patent Document 2, since the card is thin, a current magnetic field is generated on the back surface of the surface to which the coil is attached, and it is difficult to satisfy both standards. Further, since the coil wound around the magnetic ribbon becomes thick, it is not practical to use it for a card.

  If a coil that can be formed into a flat sheet (thin film) and that generates a large magnetic field strength on one side and a small magnetic field strength on the other can be developed, both standards can be satisfied. . If such a coil can be developed, it can be used for various purposes other than the magnetic stripe card.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a coil that can be formed in a sheet shape and can generate a large magnetic field strength on one surface side. It is another object of the present invention to provide an active magnetic stripe card using the coil.

  In order to achieve the above object, the coil according to claim 1 is characterized in that the unit winding of the coil is such that the sheet-like conductor and the sheet-like conductor face each other along the surface. A ladder-like conductor in which both ends of a plurality of conductor lines arranged in parallel are connected in parallel, and one end portions of the sheet-like conductor and the ladder-like conductor are connected to each other. And

  A coil according to a second aspect is the one according to the first aspect, wherein the plurality of conductor lines are arranged orthogonal to the direction of the coil axis.

  A coil according to a third aspect is the one according to the first or second aspect, wherein the plurality of conductor lines in the ladder-shaped conductor are formed to have the same line width and the same line length, and are arranged at equal intervals. It is characterized by.

  A coil according to a fourth aspect is the one according to any one of the first to third aspects, wherein a magnetic body is disposed between the sheet-like conductor and the ladder-like conductor. .

  The coil according to claim 5 is the one according to any one of claims 1 to 4, wherein the planar shape of the sheet-like conductor is one end of the ladder-like conductor and the sheet in the unit winding of the same turn. The other end of the ladder-shaped conductor and the other end of the sheet-shaped conductor do not face each other, and the other end of the ladder-shaped conductor faces the other end of the ladder-shaped conductor. It is formed in the shape containing a parallelogram so that the other end part of may oppose.

  A coil according to a sixth aspect is the one according to the fifth aspect, wherein the magnetic body is arranged in a layered manner on a plane shape portion of the parallelogram in the sheet-like conductor. Features.

  A coil according to a seventh aspect is the one according to any one of the first to fifth aspects, wherein the magnetic body is formed in a single band shape.

  A coil according to an eighth aspect is the one according to any one of the first to seventh aspects, wherein the sheet-like conductor, the ladder-like conductor, and the magnetic body are each formed of a thin film. And

  A coil according to a ninth aspect is the one according to any one of the first to eighth aspects, wherein another magnetic body is disposed on the opposite side of the ladder-like conductor in the sheet-like conductor. And

  The magnetic stripe card according to claim 10 is an active magnetic stripe card capable of generating a magnetic field corresponding to data from a coil and reading the data with a magnetic card reader. , A drive unit that drives the coil, a control unit that controls the drive unit to change a magnetic field generated from the coil at a predetermined time interval corresponding to the data, the drive unit, and The power supply which operates the said control part and the card | curd base material provided with these are provided, It is characterized by the above-mentioned.

  The magnetic stripe card according to claim 11 is the one according to claim 10, wherein the coil has a direction in which the sheet-like conductor faces the card substrate side and the ladder-like conductor faces the outside world side, It is attached to the card substrate.

  A magnetic stripe card according to a twelfth aspect is the one according to the tenth or eleventh aspect, wherein the coil is attached to one side and the other side of the card substrate.

  A magnetic stripe card according to a thirteenth aspect is the one according to any one of the tenth to twelfth aspects, wherein a plurality of the coils corresponding to the number of a plurality of tracks are attached.

  The coil manufacturing method according to claim 14, wherein a sheet-like conductor, a magnetic body, an insulator, and a ladder-like conductor are laminated on a surface of a base material, and the sheet-like conductor and the ladder-like conductor are connected. A method of manufacturing a coil for manufacturing a coil, comprising: forming a first seed layer for electrolytic plating on a surface of a substrate; and forming the sheet on the surface of the first seed layer Forming a first mask pattern corresponding to the shape of the conductor, and forming a first conductor layer on the surface of the first seed layer by electroplating a metal conductor material to become the sheet-like conductor A step of depositing a second mask pattern corresponding to the shape of the magnetic body on the surface of the first conductor layer, and electroplating a magnetic material on the surface of the first conductor layer. Forming a magnetic layer that becomes the magnetic body, and Removing the mask pattern and the second mask pattern, removing the first seed layer at a portion not included in the shape of the sheet-like conductor, and forming the insulator on the surface of the magnetic layer. A step of forming a magnetic layer, a step of forming a second seed layer for electrolytic plating over the entire base material on the insulator layer side, and a surface of the second seed layer Forming a third mask pattern corresponding to the shape of the ladder-like conductor, and electrolytically plating a metal conductor on the surface of the second seed layer to form the ladder-like conductor. A step of forming a layer, a step of removing the third mask pattern, and a step of removing the second seed layer in a portion not included in the sheet-like conductor.

  In the coil of the present invention, since the unit winding of the coil is formed by connecting the sheet-like conductor and the ladder-like conductor, the coil can be formed into a sheet-like shape, and the ladder-like conductor having a plurality of conductor lines can be formed. A large magnetic field strength can be generated on the surface side. Therefore, the coil of the present invention can be used in various applications that generate a large magnetic field strength on one surface side. In particular, it can be suitably used for a magnetic stripe card having magnetic stripes replaced with coils on both sides. Further, since the coil is thin, it can be suitably used for a magnetic stripe card having a magnetic stripe on only one side.

  When the plurality of conductor lines are arranged orthogonal to the direction of the coil axis, the magnetic field strength in the direction of the coil axis can be increased over the ladder-shaped conductor. When the coil is used for a magnetic stripe card, the magnetic field strength in the detection direction of the magnetic head can be increased.

  When a plurality of conductor lines of a ladder-like conductor are formed with the same line width and the same line length and are arranged at equal intervals, it is possible to generate magnetic field strengths with uniform characteristics over the ladder-like conductor. .

  When a magnetic body is disposed between the sheet-like conductor and the ladder-like conductor, the magnetic field strength above the ladder-like conductor can be increased and the magnetic field strength on the surface side of the sheet-like conductor can be further reduced. .

  When the planar shape of the sheet-like conductor is formed in a shape including a parallelogram, the unit windings of the coil can be connected to each other, and the coil can be wound a plurality of times.

  When the magnetic material is arranged in layers on the parallelogram plane shape portion of the sheet-like conductor, it is technically easy to laminate the magnetic material on the conductor, so that the coil can be easily manufactured. it can.

  In the case where the magnetic body is formed in a single band shape, the magnetic body is not divided, so that the magnetic field strength distribution is hardly disturbed.

  When the sheet-like conductor, the ladder-like conductor, and the magnetic body are each formed of a thin film, the coil can be formed into a thin thin film.

  When another magnetic body is arranged on the opposite side of the ladder-like conductor in the sheet-like conductor, the other magnetic body becomes a magnetic path, so that the magnetic field intensity leaking to the surface side of the sheet-like conductor can be further reduced. it can.

  By using the coil of the present invention, the magnetic stripe card of the present invention can generate a magnetic field having a strength that can be read by a magnetic head while being a thin coil.

  When the card-like conductor is attached to the card base so that the sheet-like conductor of the coil faces the card base and the ladder-like conductor faces the outside, a large magnetic field strength can be generated only on the outside of the card base. Efficient. Therefore, for example, by attaching a plurality of coils to one side and the other side of the card substrate, the card can be used as a card that complies with the domestic standard having magnetic stripes on both sides.

  By attaching a plurality of coils corresponding to the number of tracks, a magnetic stripe card having a plurality of tracks can be used.

  According to the coil manufacturing method of the present invention, a thin-film coil can be manufactured.

It is a top view of the magnetic stripe card to which this invention is applied. It is a bottom view of the magnetic stripe card to which the present invention is applied. It is a schematic diagram which shows the use condition of the magnetic stripe card to which this invention is applied. It is a top view of the coil to which the present invention is applied. It is a partially expanded perspective view shown in the state which decomposed | disassembled the coil to which this invention is applied. It is sectional drawing which showed typically the cross section of the coil corresponding to the AA line of FIG. It is sectional drawing which showed typically the cross section of the coil corresponding to the BB line of FIG. It is a schematic diagram which shows typically the electric current which flows into the coil to which this invention is applied. It is sectional drawing which shows the other coil to which this invention is applied. It is sectional drawing which shows the manufacturing method of the coil to which this invention is applied. It is a partially expanded perspective view shown in the state which decomposed | disassembled the other coil to which this invention is applied. It is sectional drawing which showed typically the cross section of the coil corresponding to CC line of FIG. The right figure is a diagram showing the simulation result of the magnetic flux density distribution generated by the coil L, and the left figure is the coil La. It is a figure which shows the simulation result of the magnetic flux density distribution which the ladder-shaped conductor of the coil L generate | occur | produces. It is a figure which shows the simulation result of the magnetic flux density distribution which the ladder-shaped conductor of the coil L generate | occur | produces. It is a figure which shows the simulation result of magnetic flux density distribution near the slit of the coil L. FIG. The right figure shows the simulation results of the magnetic flux density distribution when the coil La has a magnetic body, and the left figure shows the magnetic flux density distribution when the coil La is an air-core coil.

  Hereinafter, modes for carrying out the invention will be described in detail, but the scope of the present invention is not limited to these modes.

  1 and 2 show an active magnetic stripe card 1 to which the present invention is applied. FIG. 1 is a plan view showing a front surface of the magnetic stripe card 1, and FIG. 2 is a bottom view showing a back surface.

As shown in both figures, the magnetic stripe card 1 includes a card base 11, coils L ₁ , L ₂ , L ₃ , L ₄ , a drive unit 12, a control unit 13, a communication unit 14, an antenna 15, and a detection unit 16 _1. , 16 ₂ , and a battery 17. This magnetic stripe card 1 is operated by replacing the magnetic stripe of the identification card defined by, for example, Japanese Industrial Standards JIS X6301: 2005 and JIS X6302: 2005 (including appendices) with coils L _{1 to} L _4. It is a thing. The magnetic stripe card 1 is, for example, a bank cash card or a credit card.

  The card substrate 11 has the same outer shape, size, and thickness as a conventional magnetic stripe card, and is formed into a substantially rectangular plate shape with a plastic.

A coil L ₁ corresponding to a magnetic stripe for one track is attached to the surface of the card base 11. Coils L ₂ , L ₃ , and L ₄ corresponding to the magnetic stripes for three tracks are attached to the back surface of the card substrate 11. The lengths of the coils L _{1 to} L _{4 in} the longitudinal direction (in the direction of the upper end side 18 of the card base 11) may be formed to be the same length as the upper end side 18 as in the conventional magnetic stripe. As shown in the figure, it may be formed with a length shorter than the upper end side 18. The widths of the coils L _{1 to} L ₄ are formed to be the widths of the respective tracks as much as the conventional magnetic stripe.

As these coils L _{1 to} L ₄ , the coil L (or coil La) of the present invention described later is used. Incidentally, it is sufficient that the coils L of the present invention to at least one of the coils L ₁ ~L ₄ (or the coil La) is used.

Each of the coils L _{1 to} L ₄ is connected to the drive unit 12. The drive unit 12 is driven by supplying current to each of the coils L _{1 to} L ₄ independently. The drive unit 12 is controlled by the control unit 13 to drive each current.

The detection units 16 ₁ and 16 ₂ are sensors for detecting that the magnetic stripe card 1 has been passed through the magnetic card reader 201 (see FIG. 3). The detection units 16 ₁ and 16 ₂ are, for example, optical sensors. The detectors 16 ₁ and 16 ₂ are arranged on the surface of the card base 11 with a positional relationship of sandwiching the longitudinal coil L ₁ (L _{2 to} L ₄ ) therebetween. The detection units 16 ₁ and 16 ₂ are connected to the control unit 13.

  The communication unit 14 is for receiving information (data) of the magnetic stripe card 1 from the outside. The communication unit 14 is configured to be able to perform wireless communication with a wireless device that transmits data from the outside. The communication unit 14 is connected to the control unit 13. The communication unit 14 is connected to an antenna 15 formed on the surface or inside of the card base 11 with a copper foil pattern, for example. The wireless device that can communicate with the communication unit 14 may be any device, but is preferably a portable wireless device carried by the user. Examples of such portable wireless devices include smartphones (multifunctional mobile phones), tablet computers (portable computers), and RFID writers. When communicating with a smartphone, the communication unit 14 may be any one that can communicate with any one of Bluetooth (registered trademark), Wi-Fi, a wireless public telephone line, and infrared communication with which the smartphone can communicate. It is preferable that the directivity conforms to the Bluetooth standard in which many small modules have been developed. Depending on necessity, another short-distance wireless communication device may be used as the communication unit 14, or a device capable of wired communication may be used as the communication unit 14. If there is no need to receive information from the outside, the communication unit 14 and the antenna 15 may not be provided.

  Although not shown, the control unit 13 includes a CPU (Central Processing Unit), a memory, and an interface circuit. The control unit 13 controls the operation of each unit.

  The battery 17 is for supplying electric power for operation to each unit such as the drive unit 12, the control unit 13, and the communication unit 14. As an example, the battery 17 is formed in a thin sheet shape. The drive unit 12, the control unit 13, the communication unit 14, and the battery 17 are embedded in the card substrate 11.

  Next, the operation of the magnetic stripe card 1 will be described.

  FIG. 3 is a schematic diagram showing the usage state of the magnetic stripe card 1. As shown to (A) in the figure, before using the magnetic stripe card 1, information (data) for each track is transmitted from the wireless device such as the smartphone 210 to the magnetic stripe card 1. Application software for setting information on the magnetic stripe card 1 is installed in the smartphone 210 in advance. A magnetic card reader 201 in the figure is for a conventional magnetic stripe card.

  The communication unit 14 (see FIG. 1) of the magnetic stripe card 1 outputs the information received from the smartphone 210 to the control unit 13 (see FIG. 1). The control unit 13 records the information in a memory so that it can be rewritten (temporarily).

Control unit 13, a signal indicating that the magnetic stripe card 1 is passed through the magnetic card reader 201 (signal which detected the magnetic head 202) monitors whether output from the detecting unit 16 _1, 16 _2. When the detection units 16 ₁ and 16 ₂ are optical sensors, both the detection units 16 ₁ and 16 ₂ detect light when they are not passed through the magnetic card reader 201 as shown in FIG. Because dark when they are passed through a magnetic card reader 201, the first detector 16 ₁ is no longer detects the light, the detection unit 16 _1, 16 ₂ does not detect both light in the state in FIG. 3 (B). Begins the detection unit 16 ₁ out magnetic stripe card 1 detects light through the magnetic card reader 201, ready in FIG 3 (C) all out eventually, detector 16 _1, 16 ₂ are both Detect light. As described above, since the detection state of the light is changed, the control unit 13, when the detection unit 16 1 _or the detector 16 _1, 16 ₂ no longer detects the light from a state that was detected light, magneto It may be determined that the stripe card 1 has been passed through the magnetic card reader 201. From this state, when the detection unit 16 ₁ or the detection units 16 ₁ and 16 ₂ detect light, it may be determined that the magnetic stripe card 1 has passed the magnetic card reader 201. The detection units 16 ₁ and 16 ₂ are not limited to optical sensors, and the magnetic card reader 201 (magnetic head 202) may be detected by other sensors. The magnetic stripe card 1 may be provided with a switch such as a push button so that data is output when the switch is operated.

Control unit 13, upon detection of the magnetic card reader 201, Fig. 1, and controls the driving unit 12 shown in FIG. 2, the corresponding polarity coils L ₁ ~ a magnetic field to each bit of the data string of each track successively be generated from L _4. The magnetic field generated from each of the coils L _{1 to} L ₄ is the same as the magnetic field read by the magnetic head corresponding to each bit when the conventional magnetic stripe card is slid. Since the number of bits of the data string is large, in order to output all data while the magnetic stripe card 1 is passed through the magnetic card reader 201, the data bits are switched at short predetermined time intervals. When the output of all data is completed, it is preferable to output the data repeatedly again. Control unit 13, when it detects that the magnetic stripe card 1 has passed a magnetic card reader 201 stops the current supply of the drive unit 12 to stop the output of the magnetic field from each coil L ₁ ~L ₄ .

  The controller 13 may erase the information from the memory after outputting the data.

In the conventional magnetic stripe card, it is necessary to slide the magnetic stripe card through the magnetic card reader 201 in order to cause the magnetic head 202 to read data. The magnetic stripe card 1 of the present invention may be slid and passed through the magnetic card reader 201 as in the prior art, but is generated by sequentially changing the magnetic field corresponding to the data bits from the coils L _{1 to} L _4. Therefore, the data can be read even if the magnetic head 202 is stopped at the position without sliding.

An enlarged view of the vicinity of the magnetic head 202 is shown in the right-side round frame in FIG. The magnetic detection direction H is set so that the magnetic head 202 used conventionally detects the magnetic field in the direction indicated by the alternate long and short dash line within the circle frame. This is the same direction as the moving direction of the magnetic stripe card 1, that is, the longitudinal direction of the magnetic stripe card 1. Therefore, the coil L ₁ is a longitudinal direction of the magnetic stripe card 1 is formed in a direction the coil axis. Although not shown, magnetic heads for the coils L _{2 to} L ₄ are provided on the back side of the card. Similarly, the coils L _{2 to} L ₄ on the back side of the magnetic stripe card 1 are also formed so that the longitudinal direction of the magnetic stripe card 1 becomes the coil axis.

The distance between the coil _{L 1} and the magnetic head 202, as an example, it is necessary to consider up to a maximum of about 500 [mu] m. As an example, the coil L ₁ needs to apply a magnetic field of 1.25 × 10 ⁻⁶ T or more to the magnetic head 202. The same applies to the coils L _{2 to} L ₄ .

  Next, the coil L of the present invention used for the magnetic stripe card 1 will be described in detail.

  4 to 7 show a coil L to which the present invention is applied. 4 is a plan view of the coil L, FIG. 5 is a partially enlarged perspective view schematically showing the coil L in an exploded state, and FIG. 6 is a coil corresponding to the line AA in FIG. 7 is a cross-sectional view schematically showing a cross section of L, and FIG. 7 is a cross-sectional view schematically showing a cross section of the coil L corresponding to the line BB in FIG. In addition, illustration of the base material in which the coil L is formed is abbreviate | omitted.

  As shown in FIG. 4, the coil L is formed in a substantially strip shape (rectangular shape) as shown in FIG. 4, and is formed in a thin sheet shape (thin film shape) as shown in FIGS. 4 is the start end (one end) of the coil L, and the location indicated by the arrow E is the end (the other end) of the coil L. The longitudinal direction of the coil L is the direction of the coil axis P indicated by a one-dot chain line in FIG. Therefore, the magnetic field detection direction H of the magnetic head 202 shown in FIG. The width of the coil L in the short direction is the width of the track corresponding to the magnetic stripe card 1.

As shown in FIG. 5, the unit winding of the coil L includes a pair of sheet-like conductors 21 and a ladder (ladder) -like conductor 24, and one end F ₁ of the sheet-like conductor 21 and the ladder-like conductor 24. one end portion G ₁ of is formed is connected. In other words, the coil L is formed of the sheet-like conductor 21 for approximately one turn (unit winding) and the ladder-like conductor 24 for the remaining half turn. A plurality of the unit windings are connected in series to form a coil L wound by a plurality of turns. That is, the coil L is formed by being connected in series with the sheet-like conductor 21, the ladder-like conductor 24, the sheet-like conductor 21, the ladder-like conductor 24, the sheet-like conductor 21, the ladder-like conductor 24,. The turn is a coil winding (number of windings).

The ladder-like conductor 24 is formed in a shape in which both ends of a plurality of conductor lines 31 arranged in parallel with each other along a surface (parallel surface) facing the sheet-like conductor 21 are connected in parallel. Thereby, the ladder-like conductor 24 is formed in a substantially square shape in plan view. Both ends connected in parallel a plurality of conductor lines 31 is in one end portion G ₁ and the other end G _2.

  The ladder-like conductor 24 is made of a known conductor such as copper or gold. When used in the magnetic stripe card 1, the plurality of conductor lines 31 are preferably formed in a thin film line pattern. The film thickness is, for example, 1 μm to 100 μm.

  The plurality of conductor lines 31 are arranged orthogonal to the direction of the coil axis P (see FIG. 4). The plurality of conductor lines 31 are formed with the same line width and the same line length, and are arranged at equal intervals. In addition, according to necessity, you may change the crossing angle of the conductor line 31 and the coil axis | shaft P suitably, or may change each line width and line length of the some conductor line 31 mutually.

  The sheet-like conductor 21 is formed in a flat sheet shape using a known conductor such as copper or gold. When used for the magnetic stripe card 1, the sheet-like conductor 21 is preferably formed by a thin line pattern. The film thickness is, for example, 1 μm to 100 μm.

The planar shape of the sheet-like conductor 21 is such that one end F ₁ of the sheet-like conductor 21 and one end G ₁ of the ladder-like conductor 24 in the unit winding of the same turn (set) are just facing each other and the ladder-like conductor 24 is. the other end portion G ₂ and without a counter and the other end portion F ₂ of the sheet-like conductor, the other end portion F ₂ exactly in the sheet-like conductor 21 of the next turn to the other end G ₂ of the ladder-like conductor 24 It is preferable to be formed in a shape including a parallelogram so as to face each other.

The height of the parallelogram (the height in the direction orthogonal to the coil axis P) is substantially the same as the line length of the conductor line 31. The length of the base of the parallelogram (longitudinal side of the coil L) is the same as the lengths of the end portions F ₁ and F ₂ of the sheet-like conductor 21 and the end portions G ₁ and G of the ladder-like conductor 24. It is the same as the length of ₂ . The diagonal angle of the parallelogram is set so that the groove width of the oblique slit 28 between the adjacent sheet-like conductors 21 and 21 (the interval between the unit windings of the coil L) becomes a predetermined width.

  Thus, when the sheet-like conductor 21 includes a parallelogram shape, the ends of the sheet-like conductor 21 and the ladder-like conductor 24 that are both formed in a planar shape are connected to each other, and the coil L is turned a plurality of times. Can be wound. If the coil L has only one turn, the planar shape of the sheet-like conductor 21 may be formed in a substantially rectangular shape similar to the outer shape of the ladder-like conductor 24.

  Between the sheet-like conductor 21 and the ladder-like conductor 24, a sheet-like (layer-like) magnetic body 22 is disposed. The magnetic body 22 may be formed on the surface of the sheet-like conductor 21. As shown in FIG. 5, the magnetic body 22 may be arranged in a substantially identical shape and laminated in layers only on the plane-shaped portion of the parallelogram in the sheet-like conductor 21. The magnetic body 22 becomes the core of the coil L.

  The magnetic body 22 is made of a known soft magnetic material (core material) such as iron, silicon steel, permalloy, or amorphous alloy. The magnetic body 22 is preferably a thin film when used in the magnetic stripe card 1. The film thickness is, for example, 1 μm to 100 μm.

  Since the magnetic body 22 has conductivity, the interlayer between the magnetic body 22 and the ladder-shaped conductor 24 (or the sheet-shaped conductor 21 and the magnetic body 24 is prevented so that the sheet-shaped conductor 21 and the ladder-shaped conductor 24 are not electrically connected by the magnetic body 22. A layered insulator 23 is disposed between the layers 22 and 22. In the figure, only a part of the insulator 23 is shown.

  The insulator 23 is a known insulating resin such as epoxy resin, polyimide, polystyrene, polyethylene terephthalate, and the like. The film thickness of the magnetic body 22 is preferably as thin as it can maintain insulation, and is, for example, 0.1 μm to 100 μm.

  As shown in the cross-sectional views of FIGS. 6 and 7, as an example, the slit 28 between the sheet-like conductors 21 and 21 may be filled with an insulator 23.

As shown in FIG. 7, between the sheet-like conductor 21 and the ladder-shaped conductor 24, because of the magnetic body 22 and the insulator 23, one end portion G of the end portion F ₁ and ladder-shaped conductor sheet conductor 21 connection between _1, and the connecting portion of the other end portion G ₂ of the other end portion F ₂ and ladder-like conductor sheet conductor 21 is formed thicker.

  In FIG. 8, the electric current which flows into the coil L is illustrated with the dashed-two dotted line arrow. In the drawing, one ladder-like conductor 24 portion of the coil L is schematically shown. In the figure, the magnetic body 22 and the insulator 23 are shown only in a portion overlapping with one ladder-like conductor 24, and the illustration of the magnetic body 22 and the insulator 23 in a portion not overlapping is omitted.

  As shown in the figure, the sheet-like conductor 21 is a single wide conductor. On the other hand, the ladder-like conductor 24 has n elongated conductor lines 31 (n is an integer). The inductance of the linear conductor increases as the length increases, and increases as the cross-sectional area decreases. Although the length of the sheet-like conductor 21 is slightly longer than the length of the conductor line 31, the cross-sectional area of one conductor line 31 is larger than the cross-sectional area of the sheet-like conductor 21. Is small enough. Therefore, the inductance of one conductor line 31 is larger than the inductance of the sheet-like conductor 21.

  When the current It flows through the sheet-like conductor 21, the magnitude of the current Is flowing through one conductor line 31 is It / n. The total current flowing through the entire ladder-shaped conductor 24 is equal to the current It flowing through the sheet-like conductor 21, but the individual conductor lines 31 have a larger inductance as described above. For this reason, the total magnetic flux generated by the ladder-like conductor 24 is larger than the magnetic flux generated by the sheet-like conductor 21. The magnetic flux generated by the ladder-shaped conductor 24 passes through the space above the ladder-shaped conductor 24 (upper side in FIG. 6), but passes through the interior of the magnetic body 22 on the sheet-shaped conductor 21 side (lower side in FIG. 6). It passes as a magnetic path. Therefore, in the coil L, the magnetic field intensity on one surface side (the surface side of the ladder-like conductor 24: the upper side in FIG. 6) is the other surface side (the surface side of the sheet-like conductor 21: the lower side in FIG. 6). This produces an asymmetric magnetic field.

  Therefore, the coil L can be suitably used for the active magnetic stripe card 1. In addition, the coil L can be suitably used for other applications, devices, systems, and the like that need to increase the magnetic field strength on one side.

  The number n of the conductor lines 31 included in the ladder-shaped conductor 24 may be plural, but in order to increase the asymmetry of the magnetic field strength of the coil L and to average the magnetic field strength over the ladder-shaped conductor 24, several A larger amount is preferable. However, if the number n is increased, a current It that is n times the current Is flowing through one conductor line 31 flows through the entire coil L. For this reason, the current capacity of the drive unit 12 that drives the coil L is taken into account for appropriate design. The sheet-like conductor 21 preferably has a shape that does not have slits or holes penetrating the sheet so that the cross-sectional area can be increased.

As shown in FIG. 6, the width of the conductor line 31 when the D _1, because the better to reduce the width D ₁ can reduce the cross-sectional area of the conductor line 31, it is possible to increase the generated magnetic field strength. The spacing of the conductor lines 31 between when the D _2, since the better to reduce the distance D ₂ can be averaged magnetic field strength of the space over the ladder-shaped conductor 24, preferably. Further, the slit width between the sheet conductor 21 to each other is taken as D _3, for better to reduce the slit width D ₃ can be averaged magnetic field strength of the space over the ladder-shaped conductor 24, preferably . As an example, when the coil L is used for a magnetic stripe card, the width D ₁ is 10 μm to ₁ mm, the interval D ₂ is 10 μm to ₁ mm, and the slit width D ₃ is 10 μm to 1 mm. In the figure, an example in which width D ₁ = interval D ₂ = slit width D ₃ is shown.

The spatial distribution of the magnetic field intensity generated by the coil L is as follows: width D ₁ , interval D ₂ , slit width D ₃ , line length of the conductor line 31, number n of the conductor lines 31, film thickness of the ladder-like conductor 24, magnetic body 22 The magnetic permeability, the film thickness (cross-sectional area) of the magnetic body 22, and the current Is change as parameters. Therefore, the spatial distribution of the magnetic field intensity can be adjusted to an arbitrary intensity by appropriately adjusting these parameters. Since the number of parameters is large, the degree of freedom in designing the coil L is increased, and adjustment to a desired magnetic field strength is easy.

  The arrangement of the magnetic body 22 (core) can increase the magnetic field strength generated by the coil L and can increase the asymmetry of the magnetic field strength between one surface and the other surface of the coil L. You may use as an air core coil, without providing the magnetic body 22 according to the necessity of the application to be used.

  Further, as shown in FIG. 9, another sheet-like (layer-like) magnetic body 26 may be arranged on the opposite side of the sheet-like conductor 21 from the ladder-like conductor 24 (the lower side in the figure). FIG. 9 corresponds to a cross-sectional view at the same position as in FIG. When the magnetic body 26 is arranged in this way, the magnetic flux on the other surface side of the coil L (the surface side of the sheet-like conductor 21) passes through the inside of the magnetic body 26 as a magnetic path, so that the space on the other surface side of the coil L The magnetic field strength can be further reduced. The magnetic body 26 is preferably formed in a substantially strip shape substantially the same as the overall shape on the other surface side of the coil L, but only on the lower surface (lower side of the figure) of the sheet-like conductor 21. It may be formed in substantially the same shape as the conductor 21. For example, the magnetic body 26 is made of the same material as the magnetic body 22. In addition, when the magnetic body 26 straddles the adjacent sheet-like conductors 21 as shown in the figure, the illustration is omitted, but the sheet-like conductors are provided so that the adjacent sheet-like conductors 21 are not conducted by the magnetic bodies 26. A layered insulator is provided between 21 and the magnetic body 26.

  Next, the equivalent series resistance of the coil L will be described.

The equivalent series resistance Ru of the unit winding of the coil L is a value obtained by connecting the resistance Rt of the sheet-like conductor 21 and the resistance Rr of the ladder-like conductor 24 in series, and is expressed by the following equation.
Ru = Rt + Rr

The resistance Rr of the ladder conductor 24 is a value obtained by connecting n resistances Rs of the conductor line 31 in parallel, and is represented by the following equation.
Rr = Rs / n

The equivalent series resistance Ra of the coil L is a value obtained by connecting the equivalent series resistance Ru of the unit winding in series for the number of turns T of the coil L, and is represented by the following equation.
Ra = T × Ru = T × (Rt + Rs / n)

  Since the conventional coil has a structure in which a single elongated conductive wire is wound, the equivalent series resistance is increased. On the other hand, the coil L of the present invention can increase the cross-sectional area of the sheet-like conductor 21 as appropriate, so that the resistance Rt of the sheet-like conductor 21 can be reduced and n conductor lines 31 are connected in parallel. The resistance Rr of the conductor 24 can be reduced. Therefore, the coil L of the present invention can reduce the equivalent series resistance Ra as compared with the conventional coil. Furthermore, the equivalent series resistance Ra of the coil L of the present invention includes the cross-sectional area (film thickness and width) of the sheet-like conductor 21, the cross-sectional area of the conductor line 31 (film thickness and width D1), the number n of the conductor lines 31, and the winding The number changes as a parameter. Since the number of parameters is large, the degree of freedom in design is increased, and adjustment to a desired equivalent series resistance is facilitated. Also, the inductance of the entire coil can be adjusted by design, and the adjustment of the time constant (= inductance / resistance) of the coil is easy.

  When the coil L is used for the magnetic stripe card 1, the voltage for driving the coil L is limited with the voltage of the battery 17 as the upper limit. In order to obtain the required magnetic field intensity from the coil L, it is necessary to drive the coil L with a desired current It by driving with the voltage of the battery 17. The current It flowing through the coil L depends on the equivalent series resistance Ra of the coil L. Since the coil L of the present invention can easily adjust the equivalent series resistance Ra, it can be adjusted to an optimum current value according to the battery 17 and the drive unit 12 of the magnetic stripe card 1. Since the current value can be adjusted, it is possible to adjust to the optimum magnetic field strength.

  Even when the coil L of the present invention is used for other applications, the structural parameters such as the cross-sectional area, width, and number of the sheet-like conductor 21 and the ladder-like conductor 24 are appropriately adjusted so that the inductance, equivalent series resistance It is possible to control electrical property values such as capacity and current value.

  Furthermore, the coil L of the present invention has a structure in which the sheet-like conductor 21 has a wide shape and is strong in strength, and the ladder-like conductor 24 has a plurality of conductor lines 31 connected in parallel. It is strong and resistant to damage. For example, even if one or two conductor lines 31 of the ladder-like conductor 24 are cut off, there are a plurality of conductor lines 31, so that a current flows through the remaining conductor lines 31 and can continue to be used. Since the conventional coil has a structure in which a long and thin conducting wire is wound, if the conducting wire is cut, it is completely damaged and cannot be used.

  Next, the manufacturing method of the coil L of this invention is demonstrated, referring FIG. This figure shows the position of the cross-sectional view shown in FIG. In FIG. 10, the thickness of each layer is shown in a scale that is more emphasized than in FIG. 7 so that the invention can be easily understood.

  In the coil L to be manufactured, the sheet-like conductor 21, the magnetic body 22, the insulator 23, and the ladder-like conductor 24 are laminated on the surface of the base material 81, and the sheet-like conductor 21 and the ladder-like conductor 24 are connected at the ends. It has been done.

  In the first step, as shown in FIG. 10A, a known method such as sputtering, physical vapor deposition (PVD) or chemical vapor deposition (CVD) is applied to the surface of a flat substrate 81 for electrolytic plating. A first seed layer (conductive thin film) 82 is formed. As an example, the substrate 81 may be a plastic plate corresponding to the card substrate 11 (see FIG. 1), or may be a plate made of glass, ceramic, or the like. For example, the seed layer 82 is formed of two layers of a Cr layer and a Cu layer. In order to improve the adhesion of the Cu layer to the base material 81, a Cr layer is first formed on the surface of the base material 81 with a thin film thickness of, for example, 50 nm, and a Cu film with a film thickness of, for example, about 200 nm is formed thereon. It is preferable to form the seed layer 82 by forming a layer.

  In the next step, as shown in FIG. 10B, a known masking solution is applied to the surface of the seed layer 82 using the first mask 101, and the masking solution is cured by heating or light irradiation. Then, a first mask pattern 83 masked in a shape corresponding to the negative shape of the sheet-like conductor 21 is formed.

  In the next step, as shown in FIG. 10C, a metal conductor such as Cu is electrolytically plated on the surface of the seed layer 82 to deposit it to a desired film thickness, and the sheet-like conductor 21 is formed on portions other than the mask pattern 83. A first conductor layer 84 is formed.

  In the next step, as shown in FIG. 10D, a known masking solution is applied to the surfaces of the first conductor layer 84 (sheet-like conductor 21) and the mask pattern 83 using the second mask 102. Then, the masking solution is cured by heating or light irradiation, and a second mask pattern 85 masked in a shape corresponding to the negative shape of the magnetic body 22 is formed. The mask pattern 85 only needs to be formed on at least the surface of the conductor layer 84. The portion of the conductor layer 84 on which the mask pattern 85 is formed is connected to the ladder-like conductor 24 later.

  In the next step, as shown in FIG. 10 (E), a soft magnetic material such as permalloy is electrolytically plated on the surface of the conductor layer 84 (sheet-like conductor 21) to deposit it to a desired film thickness. A magnetic layer 86 to be the magnetic body 22 is formed on the other portions.

  In the next step, as shown in FIG. 10F, the mask pattern 83 and the mask pattern 85 are dissolved and removed with a chemical.

  In the next step, as shown in FIG. 10 (G), the seed layer 82 in a portion (unnecessary portion) that is not included in the shape of the sheet-like conductor 21 shown in the round frame in FIG. 10 (F) is formed. For example, it is removed by ion milling (reverse sputtering).

  In the next step, as shown in FIG. 10 (H), a third mask 103 is used to apply a known insulating resin (for example, a resist agent) in the form of a liquid or gel that becomes the insulator 23. The insulating layer 87 is formed on the surface of the magnetic layer 86 (magnetic body 22) by curing by heating or light irradiation. The third mask 103 is a positive mask. The other first mask 101, the second mask 102, and the third mask 104 described later are negative masks.

  In the next step, as shown in FIG. 10I, a second seed layer 88 for electrolytic plating is formed over the entire surface of the base material 81 on the insulator layer 87 side. The method for forming the seed layer 88 is the same as the method shown in FIG.

  In the next step, as shown in FIG. 10J, a known masking solution is applied to the surface of the seed layer 88 using the fourth mask 104, and the masking solution is cured by heating or light irradiation. Then, a third mask pattern 89 masked in a shape corresponding to the negative shape of the ladder-like conductor 24 is formed.

  In the next step, as shown in FIG. 10K, a metal conductor such as Cu is electroplated on the surface of the seed layer 88 to deposit it to a desired film thickness, and the ladder-like conductor 24 is formed on portions other than the mask pattern 89. A second conductor layer 90 is formed. The second conductor layer 90 shown in the figure shows a portion that is just the conductor line 31.

  In the next step, as shown in FIG. 10 (L), the mask pattern 89 is dissolved and removed with a chemical.

  In the next step, as shown in FIG. 10M, the seed layer 88 in a portion (unnecessary portion) that is not included in the sheet-like conductor 21 shown in a round frame in FIG. It is removed by ion milling (reverse sputtering).

  By performing the above steps, as shown in FIG. 10M, the sheet-like conductor 21, the magnetic body 22, the insulator 23, and the ladder-like conductor 24 are all laminated in a thin film on the surface of the base material 81. A thin film coil L can be manufactured.

  11 and 12 show another coil La to which the present invention is applied. FIG. 11 is a partially enlarged perspective view schematically showing the coil La in an exploded state, and FIG. 12 is a cross-sectional view schematically showing a cross section of the coil La corresponding to the line CC in FIG. is there. In addition, the same code | symbol is attached | subjected about the structure similar to the already demonstrated structure, and detailed description is abbreviate | omitted.

  The coil La has a single thin film strip-like magnetic body 22a (core) connected to a length substantially the same as the length of the coil La in the longitudinal direction.

  As shown in both drawings, the sheet-like conductor 21 of the coil La is formed on the surface of the substrate 20. The base material 20 is, for example, a flexible insulating resin sheet such as polyimide used for a known flexible substrate. The base material 20 may be the card base material 11 (see FIG. 1). As described with reference to FIGS. 10A to 10C, the sheet-like conductor 21 is formed by forming a seed layer on the surface of the base material 20 by sputtering or the like, and masking with a negative pattern in the shape of the sheet-like conductor 21. Then, a film can be formed on the substrate 20 by electrolytic plating. Masking and unnecessary seed layers are removed after film formation.

  The upper surface of the sheet-like conductor 21 (upper side in the figure) is not formed by forming a film on the surface of the sheet-like conductor 21, but is placed with a separate magnetic body 22a formed in advance elsewhere. . The magnetic body 22a is a known soft magnetic material similar to the magnetic body 22, and is formed on a thin film strip (ribbon) having a thickness of 10 μm to 1 mm, for example. In the magnetic body 22a, the length in the longitudinal direction of the band is approximately the same as the length in the longitudinal direction of the coil La, and the width in the short direction of the band is approximately the same as or slightly shorter than the length of the conductor line 31. Is formed. The magnetic body 22a is placed on the center of the sheet-like conductor 21 and fixed with an adhesive or the like so as to extend in the same direction as the coil axis P (longitudinal direction of the coil La).

  The ladder-like conductor 24 is formed by being attached to the surface of the insulating base material 23a. The insulating base material 23a functions as an insulator so that the magnetic body 22a and the ladder-like conductor 24 are not short-circuited. The insulating base material 23 a is a flexible insulating resin sheet similar to the base material 20. The insulating base material 23a is preferably thin and has a thickness of 10 to 500 μm, for example. The width in the short direction of the coil La of the insulating base material 23 a is longer than the width of the magnetic body 22 a and shorter than the width of the sheet-like conductor 21. The ladder-like conductor 24 can be formed on the surface of the insulating base material 23a by the same method as the sheet-like conductor 21.

As shown in FIG. 12, the insulating base material 23a is overlaid on the magnetic body 22a. The insulating base material 23a is fixed with an adhesive or the like. One end F ₁ of the sheet-like conductor 21 and one end G ₁ of the ladder-like conductor 24 are connected by the conductive paste 29 ₁ , and the other end F ₂ of the sheet-like conductor 21 and the other end G of the ladder-like conductor 24 are connected. are connected by ₂ are conductively paste 29 _2. Such a conductive paste 29 is, for example, a silver paste or a carbon paste. In FIG. 11, the location of the sheet-like conductor 21 fixed with the conductive paste 29 is indicated by a two-dot chain line frame.

  As described above, the thin film coil La can be formed even when the separate magnetic body 22a is used.

  In addition, although the example which used the separate magnetic body 22a was shown, the slit 28 is filled with insulating materials, such as resin, and is made flat so that the upper surface side of the sheet-like conductors 21, 21,. Alternatively, a single belt-like magnetic body 22a may be formed by laminating the upper surface by electrolytic plating or the like. In that case, the insulator 23 and the ladder-like conductor 24 may be formed on the formed magnetic body 22a in the same manner as the method for manufacturing the coil L.

  Although the example which formed the coils L and La with the thin film was shown, what is necessary is just to form with arbitrary board thickness and size as needed. For example, the sheet-like conductor 21 and the ladder-like conductor 24 may be formed by machining a metal plate having a thickness of 1 to 10 mm. Moreover, although the cross-sectional shape of the conductor line 31 showed the square shape, arbitrary shapes, such as circular and an ellipse, may be sufficient.

(Demonstration by simulation)
The coil L and the coil La to which the present invention is applied are modeled, and electromagnetic field analysis is performed with electromagnetic field analysis software (J-MAG, HFSS). In order to create a magnetic field intensity that can be read by the magnetic head of the magnetic card reader, the current value and the spatial distribution of the magnetic field were evaluated. The magnetic field intensity readable by the magnetic head was evaluated as 1.25 × 10 ⁻⁶ T. The distance between the coil L, the coil La, and the magnetic head was evaluated as a maximum of 500 μm.

  FIG. 13 shows a simulation result of the magnetic flux density distribution generated by the coil L (corresponding to FIG. 6) on the right side and the coil La (corresponding to the cross section at the same position as in FIG. 6) on the left side. The thickness of the conductor line 31 of the ladder-shaped conductor indicated by the reference numeral in the same figure is 10 μm, the thickness of the insulator 23 is 2 μm, the thickness of the magnetic bodies 22 and 22 a is 10 μm, the thickness of the sheet-like conductor 21 is 10 μm, The width was 50 μm, the length of the conductor line 31 was 6 mm, the width of the insulator 23 (width in the short direction of the coil) 6.4 mm, and the width of the sheet-like conductor 21 (width in the short direction of the coil) 8 mm. The total current flowing through the coils L and La was 10 mA, and the condition was such that 1 mA flows through one conductor line 31.

  As the magnetic flux density distribution, the magnetic flux density in the x-axis direction at each of the heights Z = 100 μm, 300 μm, 500 μm, and 1 mm from the upper surface of the conductor line 31 was determined.

In the coil L, in the vicinity immediately above the slit 28 (100 μm), the magnetic flux density decreases with a width as narrow as the slit width, but it is extremely narrow compared with the width of the magnetic head, and is 1.25 × 10 ^{− as} a whole. ^{Since it} has an intensity of ⁶ T or more, it can be read by a magnetic head. When Z = 300 μm to 1 mm, the strength is 1.25 × 10 ⁻⁶ T or more in almost the entire region. Therefore, it can be read by a magnetic head.

The coil La has an intensity of 1.25 × 10 ⁻⁶ T or more in almost the entire region of Z = 100 μm to 1 mm, and can be read by a magnetic head.

14 and 15 are simulation results of the magnetic flux density distribution generated by the ladder-shaped conductor, observed from the upper surface side of the ladder-shaped conductor of the coil L. FIG. In FIG. 14, when the magnetic flux density is 1.25 × 10 ⁻⁶ T or more, the color axis (magnetic flux density intensity axis) is set so that the color becomes dark (red). In this case, the intensity axis is set at a minimum value of 0 and a maximum value of 1.25 × 10 ⁻⁶ T. In FIG. 15, the intensity axis is set to a minimum value of 0 and a maximum value of 3.00 × 10 ⁻⁶ T.

From the results of FIG. 14, it can be seen that when Z = 100 μm, the color is light, that is, the magnetic flux density is 1.25 × 10 ⁻⁶ T or less in a narrow range near the slit and the end of the ladder-like conductor. This range is extremely narrow compared to the width of the magnetic head, and has a strength of 1.25 × 10 ⁻⁶ T or more as a whole, so that it can be considered that the magnetic head can sufficiently read. In practice, the magnetic flux density is averaged due to differences in local characteristics such as manufacturing variations, and it is considered that there is no sharp drop in the magnetic flux density as in the simulation. Moreover, although the simulation was performed with one ladder-shaped conductor, it is considered that when a plurality of ladder-shaped conductors are used, the strength is further increased because the magnetic flux density near the end is added. At Z = 300 μm, 500 μm, and 1 mm, there is a strength of 1.25 × 10 ⁻⁶ T or more in almost the entire region. Therefore, it can be considered that the magnetic head can read.

  From the result of FIG. 15, it can be seen that the closer to the conductor line of the ladder-like conductor, the larger the magnetic flux density. From this, it can be said that when Z = 100 μm, even if the magnetic flux density in the vicinity immediately above the slit is small, there is a conductor line that generates a large magnetic flux density in the immediate vicinity, so that it can be read by the magnetic head.

  FIG. 16 shows the simulation result of the magnetic flux density distribution in the vicinity of the slit 28 of the coil L.

  The right figure of FIG. 17 is a simulation result of the magnetic flux density distribution when the coil La has a magnetic body, and the left figure in the figure is the simulation result of the magnetic flux density distribution when the coil La is an air-core coil. is there. Even an air-core coil generates a magnetic field, but having a magnetic material is stronger. Theoretically, when the magnetic permeability is increased, the strength can be increased up to twice that of the air-core coil.

1 active type magnetic stripe card, 11 card substrate, 12 is a drive unit, 13 control unit, 14 communication unit, 15 Antenna, ₁₆ 1, 16 ₂ detector, 17 battery, 18 the upper end Side, 20 is a base material, 21 is a sheet-like conductor, 22 and 22a are magnetic bodies, 23 is an insulator, 23a is an insulating base material, 24 is a ladder-like conductor, 26 is another magnetic body, 28 is a slit, 29 ₁ and _{2 2} are conductive pastes, 31 are conductor lines, 81 is a substrate, 82 is a first seed layer, 83 is a first mask pattern, 84 is a first conductor layer, and 85 is a second mask pattern. , 86 is a magnetic layer, 87 is an insulator layer, 88 is a second seed layer, 89 is a third mask pattern, 90 is a second conductor layer, 101 is a first mask, and 102 is a second mask. , 103 is a third mask, 104 is a fourth mask, 201 is Magnetic card reader, 202 a magnetic head, 210 smartphone, D ₁ is the width of the conductor line, D ₂ is the interval between the conductor lines, D ₃ slit width between the adjacent sheet-like conductor, E is an arrow indicating the termination, F ₁ is one end of the sheet-like conductor, F ₂ is the other end of the sheet-like conductor, G ₁ is one end of the ladder-like conductor 24, G ₂ is the other end of the ladder-like conductor 24, and H is the magnetism of the magnetic head. Detection direction, Is is a current flowing through one conductor line, It is a current flowing through a sheet-like conductor, L·La · L ₁ · L ₂ · L ₃ · L ₄ are coils, P is a coil axis, and S is a starting end. It is an arrow which shows.

Claims (14)

  The unit winding of the coil includes a sheet-like conductor and a ladder-like conductor in which both ends of a plurality of conductor lines arranged in parallel with each other along a surface facing the sheet-like conductor are connected in parallel. A coil, wherein one end portions of a sheet-like conductor and the ladder-like conductor are connected to each other.   The coil according to claim 1, wherein the plurality of conductor lines are arranged orthogonal to the direction of the coil axis.   The coil according to claim 1 or 2, wherein the plurality of conductor lines in the ladder-like conductor are formed to have the same line width and the same line length, and are arranged at equal intervals.   The coil according to any one of claims 1 to 3, wherein a magnetic body is disposed between the sheet-like conductor and the ladder-like conductor.   The planar shape of the sheet-shaped conductor is such that one end portion of the ladder-shaped conductor and one end portion of the sheet-shaped conductor face each other in the unit winding of the same turn, and the other end portion of the ladder-shaped conductor and the sheet-shaped conductor It is formed in a shape including a parallelogram so that the other end portion does not face the other end portion of the ladder-like conductor and the other end portion of the sheet-like conductor of the next turn faces the other end portion. The coil according to any one of claims 1 to 4.   6. The coil according to claim 5, wherein the magnetic body is arranged in a layered manner on a plane shape portion of the parallelogram in the sheet-like conductor.   The coil according to any one of claims 1 to 5, wherein the magnetic body is formed in a single band shape.   The coil according to any one of claims 1 to 7, wherein the sheet-like conductor, the ladder-like conductor, and the magnetic body are each formed of a thin film.   The coil according to any one of claims 1 to 8, wherein another magnetic body is disposed on the opposite side of the ladder-like conductor in the sheet-like conductor. An active magnetic stripe card capable of generating a magnetic field corresponding to data from a coil and reading the data with a magnetic card reader,
The coil according to any one of claims 1 to 9, a drive unit that drives the coil, and a magnetic field that is generated from the coil by controlling the drive unit is changed at predetermined time intervals corresponding to the data. A magnetic stripe card comprising: a control unit; a power source for operating the drive unit and the control unit; and a card base provided with the power source.   11. The magnetism according to claim 10, wherein the coil is attached to the card base material in a direction in which the sheet-like conductor faces the card base material side and the ladder-like conductor faces the outside world side. Striped card.   The magnetic stripe card according to claim 10 or 11, wherein the coil is attached to one side and the other side of the card substrate.   The magnetic stripe card according to claim 10, wherein a plurality of the coils corresponding to the number of a plurality of tracks are attached. A coil manufacturing method for manufacturing a coil in which a sheet-like conductor, a magnetic body, an insulator, and a ladder-like conductor are laminated on a surface of a substrate, and the sheet-like conductor and the ladder-like conductor are connected. And
Forming a first seed layer for electrolytic plating on the surface of the substrate;
Forming a first mask pattern corresponding to the shape of the sheet-like conductor on the surface of the first seed layer;
Forming a first conductor layer on the surface of the first seed layer by electroplating a metal conductor material to form the sheet-like conductor;
Forming a second mask pattern corresponding to the shape of the magnetic body on the surface of the first conductor layer;
Forming a magnetic layer on the surface of the first conductor layer by electroplating a magnetic material to form the magnetic material;
Removing the first mask pattern and the second mask pattern;
Removing the first seed layer in a portion not included in the shape of the sheet-like conductor;
Forming a magnetic layer that becomes the insulator on the surface of the magnetic layer;
Forming a second seed layer for electrolytic plating over the entire base material on the insulator layer side;
Forming a third mask pattern corresponding to the shape of the ladder-shaped conductor on the surface of the second seed layer;
Electrolytically plating a metal conductor on the surface of the second seed layer to form a second conductor layer that becomes the ladder-shaped conductor; and
Removing the third mask pattern;
Removing the second seed layer at a portion not included in the sheet-like conductor;
A method for manufacturing a coil, comprising: