Magnetic sheet and method for manufacturing a magnetic sheet

Abstract

To provide a magnetic sheet of which the manufacture can be facilitated while suppressing damage of required characteristics, a multilayer magnetic sheet, and a manufacturing method of the magnetic sheet.SOLUTION: A magnetic sheet comprises: a first magnetic sheet 110 and a second magnetic sheet 120 including a support 11 formed in a band shape, an adhesive layer 10 including an adhesive 12, a magnetic thin band 20 formed in a band shape using a material having magnetism and adhered to the adhesive layer 10, and a resin sheet 15 formed in a band shape using a resin material and disposed in the adhesive layer 10; and a fixing tape 130 for performing fixing in a state where an end 111 of the first magnetic sheet 110 in a length direction of the magnetic thin band 20 and an end 121 of the second magnetic sheet 120 in a length direction of the magnetic thin band 20 are adjacent with each other at an interval D equal to or less than a predetermined value.SELECTED DRAWING: Figure 2

Description

Technical Field

[0001] The present disclosure relates to a magnetic sheet used for an inductor, a magnetic shield, etc., a multilayer magnetic sheet, and a method for manufacturing a magnetic sheet.

Background Art

[0002] In recent years, non-contact charging that provides charging by power transmission using electromagnetic induction by providing transmission coils on both the power supply side and the power reception side has attracted attention. In non-contact charging, power supply is performed by generating an electromotive force in the secondary transmission coil of the power reception device through the magnetic flux generated in the primary transmission coil of the power supply device via the housings of the power supply device and the power reception device.

[0003] Non-contact charging has begun to spread to electronic devices such as tablet-type information terminals, music players, smartphones, and mobile phones. Further, non-contact charging is a technology applicable to electronic devices other than those described above, electric vehicles, and drones. It is also a technology applicable to transport vehicles such as forklifts and AGVs (Automated Guided Vehicles), railways, and streetcars.

[0004] In order to increase the power transmission efficiency in non-contact charging, a magnetic sheet may be installed as a coil yoke on the side opposite to the contact surface between the power supply device and the power reception device in the transmission coil. The magnetic sheet arranged in this way has roles such as a role as a magnetic shielding material for preventing magnetic flux leakage during charging and a role as a yoke member for refluxing the magnetic flux generated in the coil during charging.

[0005] As methods for manufacturing the above-described magnetic sheet, various methods have been proposed (see, for example, Patent Documents 1 to 3). Patent Documents 1 to 3 disclose a manufacturing method including a step of dividing a plurality of thin plate-shaped magnetic bodies, ribbons of amorphous alloys or nanocrystalline grain alloys (hereinafter also referred to as "alloy thin strips") included in the magnetic sheet for the purpose of improving the Q value or reducing eddy current loss.

[0006] Patent Document 1 discloses a manufacturing method comprising the steps of forming a magnetic sheet by bonding an alloy strip to an adhesive layer provided on a sheet substrate, and dividing the alloy strip into multiple parts by external force while maintaining the state in which the alloy strip is bonded to the sheet substrate.

[0007] Patent Document 2 discloses a method for manufacturing a magnetic sheet, which involves heat-treating an alloy strip and then flake-treating it to separate the alloy strip into numerous small pieces or to form cracks in the alloy strip. The disclosed magnetic sheet has a configuration in which multiple alloy strips are laminated together, with an adhesive layer or double-sided tape placed between the multiple alloy strips. [Prior art documents] [Patent Documents]

[0008] [Patent Document 1] Japanese Patent Publication No. 2008-112830 [Patent Document 2] Special Publication No. 2015-505166 [Patent Document 3] International Publication No. 2020-235642 [Overview of the project] [Problems that the invention aims to solve]

[0009] As described above, a multilayer magnetic sheet made by laminating multiple alloy strips has a structure in which an adhesive layer (also referred to as a bonding layer) is placed between adjacent alloy strips. The adhesive layer has the function of bonding adjacent alloy strips together and ensuring insulation between adjacent alloy strips.

[0010] The following manufacturing method is used to produce this multilayer magnetic sheet. First, a laminate is manufactured by bonding an alloy strip to one side of an adhesive layer. Next, multiple laminates are stacked to produce a multilayer magnetic sheet.

[0011] In some cases, heat treatment is performed on alloy strips to impart desired properties. For example, an amorphous alloy strip may be manufactured, and then heat-treated to induce crystallization, thereby giving the alloy strip the desired properties.

[0012] It is known that alloy strips subjected to the aforementioned heat treatment have reduced strength compared to alloy strips before heat treatment. Because the strength of the heat-treated alloy strips is reduced, they sometimes break during the process of bonding the alloy strips to one side of the adhesive layer described above.

[0013] If the alloy strip is cut, the supply of the alloy strip is resumed and the process of bonding the alloy strip to one side of the adhesive layer is restarted and continued. However, there was a risk of the alloy strip being missing in the manufactured laminate.

[0014] In other words, there was a risk that gaps could form between the alloy strips before and after cutting in the manufactured laminate. In this case, the laminate with the missing parts may not meet the required properties as a magnetic shielding material or as a yoke member, and therefore could not be used in the manufacture of multilayer magnetic sheets.

[0015] Furthermore, there was a problem in that if the length of the laminate, in which an alloy strip is bonded to one side of the adhesive layer, was shorter than the length of the multilayer magnetic sheet, the laminate could not be used in the manufacture of the multilayer magnetic sheet.

[0016] This disclosure provides a magnetic sheet, a multilayer magnetic sheet, and a method for manufacturing a magnetic sheet, which can be easily manufactured while suppressing the deterioration of the required properties. [Means for solving the problem]

[0017] A magnetic sheet according to a first aspect of the present disclosure comprises a first magnetic sheet and a second magnetic sheet, each comprising: a support formed in the shape of a strip; an adhesive layer having an adhesive provided on a first surface and a second surface of the support; a thin magnetic strip formed in the shape of a strip using a magnetic material and adhered to the adhesive on the first surface of the adhesive layer; and a resin sheet formed in the shape of a strip using a resin material and placed on the adhesive on the second surface of the adhesive layer; and a fixing tape for fixing the longitudinal ends of the thin magnetic strip in the first magnetic sheet and the longitudinal ends of the thin magnetic strip in the second magnetic sheet adjacent to each other at an interval of less than or equal to a predetermined value, wherein the fixing tape is provided and adheres across the resin sheet in the first magnetic sheet and the resin sheet in the second magnetic sheet.

[0018] A multilayer magnetic sheet according to a second aspect of the present disclosure comprises a support formed in the shape of a strip, and at least one adhesive layer having an adhesive provided on a first surface and a second surface of the support, and a plurality of magnetic strips formed in the shape of a strip using a magnetic material and adhered to the adhesive on at least one of the first surface and the second surface of the adhesive layer, wherein at least one of the magnetic strips has two ends that extend in a direction intersecting the longitudinal direction facing each other at an interval of less than or equal to a predetermined value.

[0019] The manufacturing method of the magnetic sheet according to the third aspect of the present disclosure includes a support formed in a strip shape, an adhesive layer having adhesives provided on the first surface and the second surface of the support, a magnetic thin strip formed in a strip shape using a magnetic material and adhered to the adhesive on the first surface of the adhesive layer, and a resin sheet formed in a strip shape using a resin material and disposed on the adhesive on the second surface of the adhesive layer. The method includes a first cutting step of cutting a first magnetic sheet provided with these in a direction intersecting the longitudinal direction into a first predetermined shape, a second cutting step of cutting a second magnetic sheet provided with the adhesive layer, the magnetic thin strip, and the resin sheet in a direction intersecting the longitudinal direction into a second predetermined shape corresponding to the first predetermined shape, and an adhesion step of arranging the cut end of the first magnetic sheet and the cut end of the second magnetic sheet adjacent to each other at an interval of a predetermined value or less, arranging the magnetic thin strip in the first magnetic sheet and the magnetic thin strip in the second magnetic sheet opposite to each other, and adhering a fixing tape across the resin sheet in the first magnetic sheet and the resin sheet in the second magnetic sheet.

[0020] According to the magnetic sheet according to the first aspect of the present disclosure, the multilayer magnetic sheet according to the second aspect, and the manufacturing method of the magnetic sheet according to the third aspect, since the magnetic thin strips are adjacent to each other at an interval of a predetermined value or less, it is easy to suppress a decrease in characteristics caused by a portion where no magnetic thin strip is provided.

[0021] In a laminate in which an adhesive layer and a magnetic thin strip are laminated, even if the magnetic thin strip is cut and has a discontinuous portion in the longitudinal direction, the laminate can be used. That is, it is possible to use the remainder obtained by removing the discontinuous portion in the above laminate.

[0022] In a laminate in which an adhesive layer and a magnetic thin strip are laminated, even if the length of the laminate in the longitudinal direction is shorter than a desired value, the laminate can be used. That is, it is possible to connect a laminate shorter than the desired value and another laminate and use them as a laminate having a length in the longitudinal direction of the desired value or more.

Effects of the Invention

[0023] According to the magnetic sheet, multilayer magnetic sheet, and method for manufacturing a magnetic sheet of the present disclosure, by connecting magnetic thin bands adjacent to each other at intervals of a predetermined value or less, it is possible to facilitate manufacturing while suppressing deterioration of required characteristics.

Brief Description of the Drawings

[0024] [Figure 1] It is a schematic view of the magnetic sheet according to the present disclosure as viewed from the stacking direction. [Figure 2] It is an X-X cross-sectional view for explaining the configuration of the magnetic sheet of FIG. 1. [Figure 3] It is a schematic view for explaining another embodiment at the end of the first magnetic sheet and the end of the second magnetic sheet. [Figure 4] It is a schematic view for explaining yet another embodiment at the end of the first magnetic sheet and the end of the second magnetic sheet. [Figure 5] It is a Y-Y cross-sectional view for explaining the configuration of the first magnetic sheet of FIG. 1. [Figure 6] It is a longitudinal cross-sectional view for explaining the configuration of the multilayer magnetic sheet. [Figure 7] It is a widthwise cross-sectional view for explaining the configuration of the multilayer magnetic sheet. [Figure 8] It is a widthwise cross-sectional view for explaining another configuration of the multilayer magnetic sheet. [Figure 9] It is a widthwise cross-sectional view for explaining the configuration of multilayer magnetic sheets having different numbers of layers. [Figure 10] It is a schematic view for explaining the method for manufacturing a magnetic sheet. [Figure 11] It is a widthwise cross-sectional view for explaining the configuration of the laminate supplied from the first unwinding roll. [Figure 12] It is a widthwise cross-sectional view for explaining the configuration of the laminate supplied from the first unwinding and from which the resin sheet has been peeled off. [Figure 13] It is a widthwise cross-sectional view for explaining the configuration of the magnetic thin band supplied from the second unwinding roll. [Figure 14] This is a cross-sectional view in the width direction illustrating the state in which a magnetic strip is adhered to an adhesive layer by an adhesive roll. [Figure 15] This is a cross-sectional view in the width direction illustrating the state in which cracks have been formed in a magnetic thin strip by a crack roll. [Figure 16] This is a cross-sectional view in the width direction illustrating the state of a thin magnetic strip after it has been cut. [Figure 17] This is a cross-sectional view in the width direction illustrating the cutting of a magnetic sheet from which a thin magnetic strip has been cut. [Figure 18] This is a schematic diagram illustrating the manufacturing method of a multilayer magnetic sheet. [Figure 19] Figure 2 is a longitudinal cross-sectional view illustrating the state in which the resin sheet is peeled off in the magnetic sheet. [Figure 20] This is a schematic diagram illustrating the manufacturing method of a multilayer magnetic sheet. [Modes for carrying out the invention]

[0025] A magnetic sheet 100, a multilayer magnetic sheet 300, and a multilayer magnetic sheet 300T according to one embodiment of this disclosure will be described with reference to Figures 1 to 20. The magnetic sheet 100, multilayer magnetic sheet 300, and multilayer magnetic sheet 300T according to one embodiment are used in non-contact charging equipment. They may be used in the power supply device or the power receiving device of the charging equipment.

[0026] In this embodiment, the multilayer magnetic sheet 300 and the multilayer magnetic sheet 300T are described in relation to an example where they are used for contactless charging of devices that consume more power than information processing equipment or electronic devices such as smartphones.

[0027] For example, the explanation will be applied to an example where the multilayer magnetic sheet 300T is used for contactless charging of mobile devices such as automobiles. Note that the multilayer magnetic sheet 300, the multilayer magnetic sheet 300T, and the magnetic sheet 100 may also be used for contactless charging of information processing equipment and electronic devices.

[0028] Figure 1 is a schematic diagram of the magnetic sheet 100 viewed from the stacking direction. Figure 2 is a cross-sectional view illustrating the structure of the magnetic sheet 100. The stacking direction is the direction in which the magnetic strip 20, adhesive layer 10, and resin sheet 15 are stacked. In other words, the stacking direction is perpendicular to the plane of the paper in Figure 1.

[0029] The magnetic sheet 100 is a sheet that constitutes the multilayer magnetic sheet 300 and the multilayer magnetic sheet 300T. As shown in Figures 1 and 2, the magnetic sheet 100 is provided with a first magnetic sheet 110, a second magnetic sheet 120, and a fixing tape 130.

[0030] The magnetic sheet 100 has a configuration in which a first magnetic sheet 110 and a second magnetic sheet 120 are arranged longitudinally to form a single strip shape. Furthermore, the arranged first magnetic sheet 110 and second magnetic sheet 120 are fixed together with fixing tape 130.

[0031] The longitudinal direction is the direction in which the strip-shaped magnetic sheet 100, the first magnetic sheet 110, and the second magnetic sheet 120 extend. In other words, the longitudinal direction is the XX direction in Figure 1.

[0032] The end portion 111 of the first magnetic sheet 110 on the side of the second magnetic sheet 120 in the longitudinal direction has a shape that extends linearly in the width direction when viewed from the stacking direction. Similarly, the end portion 121 of the second magnetic sheet 120 on the side of the first magnetic sheet 110 in the longitudinal direction has a shape that extends linearly in the width direction when viewed from the stacking direction.

[0033] The first magnetic sheet 110 and the second magnetic sheet 120 are arranged with their ends 111 and 121 facing each other, respectively. The distance D between ends 111 and 121 is less than or equal to a predetermined value. Any value in the range of 0 mm to 1 mm can be used as the predetermined value.

[0034] Figure 3 is a schematic diagram illustrating another embodiment at the end 111 of the first magnetic sheet 110 and the end 121 of the second magnetic sheet 120. The ends 111 and 121 may have a shape that extends linearly in the width direction when viewed from the stacking direction, as described above, or they may have a shape that extends in an arc shape when viewed from the stacking direction, as shown in Figure 3.

[0035] Figure 3 shows an example in which the end 111 is convex toward the end 121 and the end 121 is concave, forming an arc shape. Alternatively, the end 121 may be convex toward the end 111 and the end 111 may be concave, forming an arc shape.

[0036] Furthermore, the ends 111 and 121 may have a shape formed from a single arc, a shape formed from multiple arcs, or a composite shape combining an arc with a different shape.

[0037] Figure 4 is a schematic diagram illustrating yet another embodiment at the end 111 of the first magnetic sheet 110 and the end 121 of the second magnetic sheet 120. The ends 111 and 121 may have a shape that extends linearly in the width direction when viewed from the stacking direction, as described above, or they may have a shape that extends in a bent shape when viewed from the stacking direction, as shown in Figure 4.

[0038] Figure 4 shows an example in which the end 111 is convex toward the end 121 and the end 121 is concave, forming a bent shape. Alternatively, the end 121 may be convex toward the end 111 and the end 111 may be concave, forming a bent shape.

[0039] Furthermore, the ends 111 and 121 may have a shape formed from a polyline having one corner, a shape formed from a polyline having multiple corners, or a composite shape combining a polyline with a different shape.

[0040] Figure 5 is a YY cross-sectional view illustrating the configuration of the first magnetic sheet. The cross-sectional views in the width direction of magnetic sheet 100, the first magnetic sheet 110, and the second magnetic sheet 120 are all the same. Here, the cross-sectional structure will be explained using the cross-sectional view in the width direction of the first magnetic sheet 110, but magnetic sheet 100 and the second magnetic sheet 120 also have the same cross-sectional structure as the first magnetic sheet 110.

[0041] The width direction is perpendicular to the longitudinal direction of the strip-shaped magnetic sheet 100, the first magnetic sheet 110, and the second magnetic sheet 120. In other words, the width direction is the YY direction in Figure 1.

[0042] As shown in Figure 5, the first magnetic sheet 110 has a structure in which one adhesive layer 10, one resin sheet 15, and one magnetic strip 20 are laminated together. The magnetic sheet 100 and the second magnetic sheet 120 have similar structures.

[0043] The adhesive layer 10 is a component to which the magnetic strip 20 is attached. The adhesive layer 10 is a component formed in a long shape, for example, a rectangular film-like component. The adhesive layer 10 mainly consists of a support 11 and an adhesive 12.

[0044] The support 11 is a long, strip-shaped membrane member, for example, a rectangular membrane member. The support 11 is formed using a flexible resin material. Polyethylene terephthalate (PET) can be used as the resin material.

[0045] The adhesive 12 is provided in a film or layer form on the first surface 11A and the second surface 11B of the support 11. In this embodiment, the explanation will be applied to an example where the first surface 11A is the surface of the film-like support 11 facing the magnetic strip 20, and the second surface 11B is the surface opposite to the first surface 11A.

[0046] The adhesive 12 can be, for example, a pressure-sensitive adhesive. For example, known adhesives such as acrylic adhesives, silicone adhesives, urethane adhesives, synthetic rubber, and natural rubber can be used as the adhesive 12. Acrylic adhesives are preferred as the adhesive 12 because they have excellent heat resistance and moisture resistance, and can bond to a wide range of materials.

[0047] The adhesive 12 is provided in layers on the first surface 11A and the second surface 11B of the support 11. In this embodiment, the explanation will be applied to an example in which the adhesive 12 is provided on the entire surface of the first surface 11A and the second surface 11B of the support 11.

[0048] Furthermore, the first surface 11A may not be the surface facing the magnetic strip 20, but rather the second surface 11B may be the surface facing the magnetic strip 20. Also, the adhesive 12 may be provided only on the surface of the support 11 that faces the magnetic strip 20, of the first surface 11A and the second surface 11B.

[0049] The resin sheet 15 is a film-like component formed using resin, and is also referred to as a protective film, release film, or liner. The resin sheet 15 is a component used to protect the magnetic sheet 100 (including multilayer magnetic sheet 300 and multilayer magnetic sheet 300T).

[0050] The resin sheet 15 has the function of suppressing the unnecessary increase of cracks 21 (or cracks that connect multiple cracks 21 in a mesh-like manner) that occur when unintended external forces are applied to the magnetic tape 20. It also has the function of suppressing the detachment of small pieces 22 of the magnetic tape 20 and suppressing the rusting of the magnetic tape 20.

[0051] Furthermore, the resin sheet 15 has the function of suppressing unwanted deformation when processing the magnetic sheet 100 (including the multilayer magnetic sheet 300 and the multilayer magnetic sheet 300T) into a predetermined shape. Examples of unwanted deformation include surface irregularities. The resin sheet 15 may be laminated together with the adhesive layer 10 as described above, or it may be laminated on its own.

[0052] The resin sheet 15 is preferably a film-like member formed using resin, and more preferably a member formed using an elastic resin. When the resin sheet 15 is a member formed using resin, the elastic force of the resin sheet 15 makes it easier to suppress the occurrence of irregularities on the surface of the magnetic strip 20.

[0053] Even if irregularities occur on the surface of the magnetic tape 20, the elastic force of the resin sheet 15 makes it easier to flatten the irregularities of the magnetic tape 20. The planar state of the magnetic tape 20 can be made to a good state with few irregularities. The change in magnetic properties of the magnetic sheet 100 over time is easily reduced.

[0054] The resin sheet 15 can be made of a resin with a lower limit of tensile modulus of 0.1 GPa. If the tensile modulus of the resin is 0.1 GPa or higher, the above effects are more easily obtained. The lower limit of the tensile modulus is preferably 0.5 GPa, and more preferably 1.0 GPa.

[0055] The upper limit of the tensile modulus of the resin is preferably 10 GPa. If it exceeds 10 GPa, it may suppress the deformation of the alloy strip when forming the crack 21 described later. The upper limit of the tensile modulus is preferably 9 GPa, and more preferably 8 GPa.

[0056] Preferably, the resin sheet 15 has a thickness of 1 μm or more and 100 μm or less. If the thickness of the resin sheet 15 increases, the magnetic sheet 100 becomes less deformable. It may become difficult to arrange the magnetic sheet 100 to conform to a curved or bent surface.

[0057] If the thickness of the resin sheet 15 is less than 1 μm, the resin sheet 15 will deform easily. This makes the resin sheet 15 difficult to handle, and the function of supporting the magnetic strip 20 by the resin sheet 15 may not be sufficiently obtained. If the resin sheet 15 is a protective film, the strength of the resin sheet 15 will be weakened, and the function of protecting the magnetic strip 20 and the like may not be sufficient.

[0058] The resin sheet 15 can be made from, for example, polyethylene terephthalate (PET), polyimide, polyetherimide, polyethylene naphthalate, polypropylene, polyethylene, polystyrene, polycarbonate, polysulfone, polyetherketone, polyvinyl chloride, polyvinyl alcohol, fluororesin, acrylic resin, cellulose, etc. From the viewpoint of heat resistance and dielectric loss, polyamide and polyimide are particularly preferred as resins for forming the resin sheet 15.

[0059] The magnetic strip 20 is a thin strip formed in a long, strip-like shape using a magnetic material. Cracks 21 are formed in the magnetic strip 20. The magnetic strip 20 is divided into a plurality of small pieces 22 by the cracks 21. In other words, the magnetic strip 20 contains a plurality of small pieces 22. The cracks 21 refer to magnetic gaps formed in the magnetic strip 20, and include, for example, cracks and / or fissures in the magnetic strip 20.

[0060] By forming cracks 21 in the magnetic strip 20, it becomes easier to improve the Q value when the magnetic sheet 100 is used as a magnetic material for an inductor. Furthermore, when the magnetic sheet 100 is used as a magnetic material for magnetic shielding, it becomes easier to reduce eddy current losses by interrupting the current path in the magnetic strip 20.

[0061] As the material for forming the magnetic thin strip 20, an alloy with an Fe-based or Co-based alloy composition can be used, and a nanocrystalline alloy or an amorphous alloy can be used. The magnetic thin strip 20 is preferably a thin strip formed from a nanocrystalline alloy (hereinafter also referred to as a "nanocrystalline alloy thin strip").

[0062] As the nanocrystalline alloy strip, a nanocrystalline alloy strip obtained by performing a nanocrystallization heat treatment on an amorphous alloy strip capable of nanocrystallization can be used. During the nanocrystallization heat treatment, it is preferable to perform the nanocrystallization heat treatment while tension is applied to the amorphous alloy strip capable of nanocrystallization. A strip formed from an amorphous alloy is also referred to as an amorphous alloy strip or an amorphous alloy strip.

[0063] The nanocrystalline alloy strip preferably has a composition represented by the following general formula. General formula: (Fe 1-a Ma) 100-x-y-z-α-β-γ Cu x Si y B z M' α M" β X γ (atom%)

[0064] In the above general formula, M is Co and / or Ni, M' is at least one element selected from the group consisting of Nb, Mo, Ta, Ti, Zr, Hf, V, Cr, Mn, and W, M'' is at least one element selected from the group consisting of Al, platinum group elements, Sc, rare earth elements, Zn, Sn, and Re, X is at least one element selected from the group consisting of C, Ge, P, Ga, Sb, In, Be, and As, and a, x, y, z, α, β, and γ satisfy 0≦a≦0.5, 0.1≦x≦3, 0≦y≦30, 0≦z≦25, 5≦y+z≦30, 0≦α≦20, 0≦β≦20, and 0≦γ≦20, respectively. Preferably, in the above general formula, a, x, y, z, α, β, and γ are 0≦a≦0.1, 0.7≦x≦1.3, 12≦y≦17, 5≦z≦10, 1.5≦α≦5, 0≦β≦1, and 0≦γ≦1, respectively.

[0065] In this embodiment, the magnetic ribbon 20 is described using an example of a ribbon (FT-3, manufactured by Hitachi Metals, Ltd.) that is an Fe-Cu-Nb-Si-B nanocrystalline alloy. Note that the magnetic ribbon 20 may also be a nanocrystalline alloy ribbon having a different composition represented by the above general formula, or an amorphous alloy ribbon.

[0066] When the magnetic ribbon 20 is a nanocrystalline alloy ribbon, it is mechanically more brittle than when the magnetic ribbon 20 is an amorphous alloy ribbon. When the magnetic ribbon 20 is a nanocrystalline alloy ribbon, a small external force is required to form a crack 21 when an external force is applied directly to the magnetic ribbon 20.

[0067] When the magnetic ribbon 20 is a nanocrystalline alloy ribbon, cracks 21 can be formed on the surface of the magnetic ribbon 20 without substantially creating irregularities. Therefore, the planar state of the magnetic ribbon 20 can be maintained in good condition. The change in the shape of the magnetic ribbon 20 over time that occurs after the magnetic ribbon 20 and the adhesive layer 10 are bonded together to form a magnetic sheet 100 is reduced. The change in magnetic properties over time in the magnetic sheet 100 and the magnetic ribbon 20 can be suppressed.

[0068] As the magnetic strip 20, for example, an alloy strip with a thickness of 100 μm or less, manufactured by roll quenching, can be used. The thickness of the magnetic strip 20 is preferably 50 μm or less, more preferably 30 μm or less, more preferably 25 μm or less, and particularly preferably 20 μm or less. Furthermore, since a thin magnetic strip 20 is difficult to handle, the thickness of the magnetic strip 20 is preferably 5 μm or more, and more preferably 10 μm or more.

[0069] The magnetic strip 20 is adhered to the adhesive 12 of the adhesive layer 10. In this embodiment, the magnetic strip 20 is adhered to the adhesive 12 provided on the first surface 11A of the adhesive layer 10. Furthermore, the magnetic strip 20 and the adhesive layer 10 have a shape that satisfies the following relationship.

[0070] 0.2mm≦(Width A-Width B)≦3mm Width A is a dimension relating to the adhesive layer 10, and more preferably a dimension relating to the region of the adhesive layer 10 to which the magnetic strip 20 is adhered, where the adhesive 12 is provided. Width B is a dimension relating to the magnetic strip 20. If the adhesive 12 is provided over the entire surface of the support 11 of the adhesive layer 10, then width A is a dimension relating to the adhesive layer 10 or the support 11.

[0071] Here, the lower limit of (width A - width B) is preferably 0.5 mm, and more preferably 1.0 mm. Also, the upper limit of (width A - width B) is preferably 2.5 mm, and more preferably 2.0 mm.

[0072] Furthermore, the magnetic thin strip 20 and the adhesive layer 10 are arranged to satisfy the following relationship. 0mm < gap a, and 0mm < gap b

[0073] Gap a and gap b are the distances from the edge of the adhesive layer 10 to the edge of the magnetic tape 20. Specifically, gap a is the distance from the first adhesive layer edge 10X of the adhesive layer 10 to the first tape edge 20X of the magnetic tape 20. Gap b is the distance from the second adhesive layer edge 10Y of the adhesive layer 10 to the second tape edge 20Y of the magnetic tape 20.

[0074] The first thin band end 20X is the end on the same side as the first adhesive layer end 10X in the magnetic thin band 20. The second adhesive layer end 10Y is the end of the adhesive layer 10 opposite to the first adhesive layer end 10X. The second thin band end 20Y is the end on the same side as the second adhesive layer end 10Y in the magnetic thin band 20.

[0075] Width A, width B, gap a, and gap b are dimensions in a direction intersecting, more preferably perpendicular to, the longitudinal direction of the magnetic sheet 100. The longitudinal direction of the magnetic sheet 100 and the longitudinal direction of the adhesive layer 10 are the same direction. Also, the longitudinal direction of the magnetic sheet 100 and the longitudinal direction of the magnetic strip 20 are the same direction.

[0076] In this embodiment, the explanation will be applied to an example where the length of the magnetic tape 20 in the longitudinal direction is 20,000 m. Furthermore, the explanation will be applied to an example where the width A, which is a dimension relating to the adhesive layer 10 or support 11, is 32 mm, the width B, which is a dimension relating to the magnetic tape 20, is 30 mm, and the difference between width A and width B is 2 mm.

[0077] The longitudinal length of the magnetic sheet 100 can be, for example, 20,000 m. The width of the magnetic sheet 100 can be, for example, 32 mm. Note that the longitudinal length of the magnetic sheet 100 may be longer or shorter than 20,000 m. The width of the magnetic sheet 100 may be wider or narrower than 32 mm.

[0078] The length of the magnetic sheet 100 in the longitudinal direction may be set to a desired length depending on the usage conditions. For example, it may be cut to the required length, such as 100 mm, 300 mm, or 1000 mm.

[0079] As shown in Figures 1 and 2, the fixing tape 130 is a tape that fixes the first magnetic sheet 110 and the second magnetic sheet 120 in an adjacent state. The fixing tape 130 is positioned and adhered across the resin sheet 15 of the first magnetic sheet 110 and the resin sheet 15 of the second magnetic sheet 120. The width of the fixing tape 130 may be the same as or shorter than the width of the first magnetic sheet 110 and the second magnetic sheet 120.

[0080] The fixing tape 130 is a film-like component formed using resin, similar to the resin sheet 15. The fixing tape 130 also has an adhesive layer for bonding with the resin sheet 15. The resin material and adhesive material constituting the fixing tape 130 can be the same as those used in the resin sheet 15.

[0081] Figure 6 is a longitudinal cross-sectional view illustrating the structure of the multilayer magnetic sheet 300. Figure 7 is a widthwise cross-sectional view illustrating the structure of the multilayer magnetic sheet 300. The multilayer magnetic sheet 300 shown in Figures 6 and 7 has a multilayer structure in which five magnetic strips 20, six adhesive layers 10, and two resin sheets 15 are laminated together. The resin sheets 15 may be a release film or a protective film.

[0082] The multilayer magnetic sheet 300 has a structure in which at least magnetic strips 20 and adhesive layers 10 are alternately laminated. In addition, resin sheets 15 are arranged at the first laminated end 301 and the second laminated end 302, which are the ends of the multilayer magnetic sheet 300 in the lamination direction.

[0083] Specifically, the structure is such that, starting from the bottom and moving upwards in Figure 6, a resin sheet 15, an adhesive layer 10, a magnetic strip 20, an adhesive layer 10, a magnetic strip 20, an adhesive layer 10, a magnetic strip 20, an adhesive layer 10, a magnetic strip 20, an adhesive layer 10, a magnetic strip 20, an adhesive layer 10, and a resin sheet 15 are stacked in that order.

[0084] In Figure 6, the second magnetic strip 20 and adhesive layer 10 from the bottom are provided with two ends 111 and 121 extending in a direction intersecting the longitudinal direction. More preferably, two ends 111 and 121 extending in the width direction are provided. In Figure 6, the width direction is perpendicular to the plane of the paper. The two ends 111 and 121 are arranged opposite each other with a distance D of less than or equal to a predetermined value.

[0085] In Figure 6, the second magnetic strip 20 and adhesive layer 10 from the bottom have two ends 111 and 121. However, the magnetic strip 20 and adhesive layer 10 other than the second layer from the bottom may also have two ends 111 and 121. Furthermore, the magnetic strip 20 and adhesive layer 10 of the same layer may have only two ends 111 and 121, or they may have four or more ends 111 and 121.

[0086] As shown in Figures 6 and 7, the multilayer magnetic sheet 300 may have a multilayer structure having at least 5 layers of magnetic strips 20, or a multilayer structure having 2 to 4 layers of magnetic strips 20. It may also have a multilayer structure having 6 or more layers of magnetic strips 20. The number of layers of magnetic strips 20 can be determined as appropriate. Preferably, the number of layers of magnetic strips 20 is 3 or more, more preferably 4 or more, and even more preferably 5 or more.

[0087] Figure 8 is a cross-sectional view in the width direction illustrating other components of the multilayer magnetic sheet 300. As shown in Figure 6, the multilayer magnetic sheet 300 may be laminated with five magnetic strips 20 arranged at the same position in the width direction, or as shown in Figure 8, they may be laminated with the strips arranged at different positions in the width direction.

[0088] Even when five magnetic strips 20 are stacked as shown in Figure 8, it is preferable that the relationships 0 mm < gap a and 0 mm < gap b are satisfied between adjacent magnetic strips 20 and the adhesive layer 10.

[0089] When the multilayer magnetic sheet 300 has the configuration shown in Figure 8, the positions of the cracks 21 in the five magnetic thin bands 20 become less likely to coincide. Therefore, it is easier to make the magnetic gap in the multilayer magnetic sheet 300 uniform.

[0090] Furthermore, when processing a multilayer magnetic sheet 300 having the configuration shown in Figure 8 by punching or cutting it into a desired shape, it is easier to suppress fluctuations in magnetic permeability depending on the processing location. Therefore, it is easier to manufacture a multilayer magnetic sheet 300 with stable shielding characteristics.

[0091] The longitudinal length of the multilayer magnetic sheet 300 can be, for example, 20,000 m. The width of the multilayer magnetic sheet 300 can be, for example, 32 mm. The longitudinal length of the multilayer magnetic sheet 300 may be longer or shorter than 20,000 m. The width of the multilayer magnetic sheet 300 may be wider or narrower than 32 mm.

[0092] The length of the multilayer magnetic sheet 300 in the longitudinal direction may be set to a desired length depending on the usage conditions. For example, it may be cut to the required length, such as 100 mm, 300 mm, or 1000 mm.

[0093] Figure 9 is a cross-sectional view in the width direction illustrating the configuration of multilayer magnetic sheets 300T with different numbers of layers. As shown in Figure 9, the multilayer magnetic sheet 300T may have a multilayer structure having more than 10 magnetic strips 20. For example, it may have a multilayer structure having 25 to 80 magnetic strips 20. It may also have a multilayer structure having more than 80 magnetic strips 20.

[0094] This multilayer magnetic sheet 300T is a preferred structural example for multilayer magnetic sheets with a large number of layers. This multilayer magnetic sheet 300T facilitates the manufacturing of multilayer magnetic sheets with a large number of layers.

[0095] The multilayer magnetic sheet 300T has a laminated structure in which one or more adhesive layers 10 are arranged between adjacent magnetic strips 20. In this embodiment, the example of a laminated structure in which one or two adhesive layers 10 are arranged between adjacent magnetic strips 20 will be described. In addition, resin sheets 15 are arranged at the first laminated end 301 and the second laminated end 302, which are both ends in the lamination direction of the multilayer magnetic sheet 300T.

[0096] Furthermore, the resin sheet 15 does not necessarily have to be laminated on the first laminated end 401 or the second laminated end 402. The magnetic strip 20 may be exposed, or, for example, an amorphous alloy strip, a nanocrystalline alloy strip, or other magnetic material, a metal foil such as aluminum, or a resin sheet may be attached to the first laminated end 301 or the second laminated end 402.

[0097] In Figure 9, one layer of adhesive layer 10 is placed between five adjacent magnetic strips 20, counting from the resin sheet 15. Two layers of adhesive layer 10 are placed between the sixth adjacent magnetic strip 20, counting from the resin sheet 15. Subsequently, one layer of adhesive layer 10 and two layers of adhesive layer 10 are placed in the same pattern.

[0098] Furthermore, in other parts, two layers of the adhesive layer 10 may be laminated. Also, three or more layers of the adhesive layer 10 may be laminated, but since the overall thickness will increase, it is preferable to have two or fewer layers of adhesive layer 10 when laminated.

[0099] The longitudinal length of the multilayer magnetic sheet 300T can be a predetermined length, for example, 100 mm or more and 1000 mm or less. The width of the multilayer magnetic sheet 300T can be a predetermined length, for example, 32 mm. The longitudinal length of the multilayer magnetic sheet 300T may be longer or shorter than the predetermined length of 100 mm or more and 1000 mm or less. The width of the multilayer magnetic sheet 300T may be wider or narrower than 32 mm.

[0100] Next, the manufacturing methods for the magnetic sheet 100, multilayer magnetic sheet 300, and multilayer magnetic sheet 300T of this embodiment will be described with reference to Figures 10 to 20. First, the manufacturing method for the magnetic sheet 100 will be described.

[0101] Figure 10 is a schematic diagram illustrating the manufacturing method of the magnetic sheet 100. The magnetic sheet 100 is manufactured using the manufacturing apparatus 500 shown in Figure 10. The manufacturing apparatus 500 is mainly equipped with a first unwinding roll 510, a first winding roll 520, a second unwinding roll 530, a bonding roll 540, a cracking roll 550, a flattening roll 560, and a third winding roll 570, arranged from upstream to downstream in the manufacturing process. The manufacturing apparatus 500 may also be equipped with a number of guide rolls 580. Note that the guide rolls 580 can be placed in positions not shown as needed.

[0102] Figure 11 is a cross-sectional view in the width direction illustrating the structure of the laminate supplied from the first unwinding roll 510. As shown in Figure 11, a laminate is wound around the first unwinding roll 510, in which resin sheets 15 are laminated on the first surface 11A and the second surface 11B of the adhesive layer 10. The resin sheet 15 on the first surface 11A is a protective sheet, and the resin sheet 15 on the second surface 11B is also referred to as a liner. The resin sheet 15 on the first surface 11A is thinner than the resin sheet 15 on the second surface 11B.

[0103] Figure 12 is a cross-sectional view in the width direction illustrating the structure of the laminate from which the resin sheet 15 has been peeled off after being supplied from the first unwinding roll 510. As shown in Figure 12, the laminate unwound from the first unwinding roll 510 has the resin sheet 15 positioned on the first surface 11A peeled off. As shown in Figure 10, the peeled resin sheet 15 is wound onto the first winding roll 520.

[0104] Figure 13 is a cross-sectional view in the width direction illustrating the configuration of the magnetic strip 20 supplied from the second unwinding roll 530. The laminate from which the resin sheet 15, positioned on the first surface 11A, has been peeled off is guided to the adhesive roll 540 by a plurality of guide rolls 580. The adhesive roll 540 is further guided to the magnetic strip 20 unwound from the second unwinding roll 530. As shown in Figure 13, no cracks 21 are formed in the magnetic strip 20 guided to the adhesive roll 540.

[0105] Here, we will describe a method for manufacturing the magnetic strip 20 unwound from the second unwinding roll 530. For example, we will describe the case where the magnetic strip 20 is a nanocrystalline alloy. The magnetic strip 20 is manufactured by a manufacturing method that includes a step of rapidly cooling the molten alloy to obtain an amorphous alloy strip that can undergo nanocrystallization, and a heat treatment step of heat-treating this amorphous alloy strip at a temperature above the crystallization start temperature to form fine crystal grains.

[0106] The rapid cooling described above is performed by a single-roll method, in which molten metal is discharged onto a rotating cooling roll and rapidly cooled and solidified. The magnetic strip 20 has a long shape, with its longitudinal direction aligned with the rotation direction of the cooling roll. The longitudinal length of the magnetic strip 20 can be, for example, 20,000 m.

[0107] The heat treatment temperature described above varies depending on the alloy composition, but is generally 450°C or higher. The fine crystal grains are, for example, Fe in a body-centered cubic lattice structure with Si in solid solution. These fine crystal grains can be analyzed using X-ray diffraction and transmission electron microscopy.

[0108] In nanocrystalline alloys, at least 50% by volume consists of fine crystalline grains with an average particle size of 100 nm or less, as measured at the maximum dimension. Furthermore, the portion of the nanocrystalline alloy other than the fine crystalline grains is mainly amorphous. The proportion of fine crystalline grains may be substantially 100% by volume.

[0109] Figure 14 is a cross-sectional view in the width direction illustrating the state in which the magnetic strip 20 is adhered to the adhesive layer 10 by the adhesive roll 540. As shown in Figure 10, the adhesive roll 540 presses the magnetic strip 20 against the laminate from which the resin sheet 15 has been peeled off to bond it. Specifically, the laminate and the magnetic strip 20 are guided between two opposing rolls, and the two rolls are used to press the magnetic strip 20 against the first surface 11A of the adhesive layer 10 to bond it, as shown in Figure 14.

[0110] The magnetic strip 20 may be positioned so that its center coincides with the adhesive layer 10 in the width direction, or it may be positioned with its center separated from it. In this case, it is positioned so as to satisfy the relationships 0 mm < gap a and 0 mm < gap b (see Figure 5). The laminate to which the magnetic strip 20 is bonded is guided from the bonding roll 540 to the crack roll 550, as shown in Figure 10.

[0111] Figure 15 is a cross-sectional view in the width direction illustrating the state in which cracks 21 have been formed in the magnetic thin strip 20 by the crack roll 550. The crack roll 550 forms cracks 21 in the magnetic strip 20 bonded to the adhesive layer 10. Specifically, the laminate to which the magnetic strip 20 is bonded is guided between two opposing rolls, and the roll with the protrusion is pressed against the magnetic strip 20 to form cracks 21 as shown in Figure 15.

[0112] Of the two rolls, the one without the protrusion is positioned on the laminate side from which the resin sheet 15 has been peeled off. The magnetic strip 20, in which the crack 21 is formed, contains several small pieces 22. These several small pieces 22 are adhered to the adhesive layer 10.

[0113] The structure of the crack roll 550 will now be described. The crack roll 550 is a roll with multiple convex members arranged on its circumferential surface. The ends of the convex members of the crack roll 550 may be flat, conical, inverted conical with a central depression, or cylindrical. The multiple convex members may be arranged regularly or irregularly.

[0114] By pressing a long magnetic strip 20 against a crack roll 550, or by passing a long magnetic strip 20 between two crack rolls 550, cracks 21 are continuously formed in the magnetic strip 20. In addition, the convex members of the crack roll 550 are pressed against multiple locations on the surface of the magnetic strip 20, forming multiple cracks 21 in the magnetic strip 20.

[0115] In forming cracks using the crack roll 550, it is preferable to further form cracks that connect multiple cracks 21 in a mesh-like manner. Specifically, it is preferable to have a step of forming multiple cracks 21 by pressing the crack roll 550 against the magnetic thin strip 20, and then forming cracks that connect the multiple cracks 21 in a mesh-like manner.

[0116] For example, after applying an external force directly to the magnetic tape 20 using a crack roll 550 to form cracks 21, a second external force may be applied by means of bending or winding the magnetic tape 20 to form cracks that connect multiple cracks 21 in a mesh-like manner. The cracks connecting the cracks 21 (magnetic gaps connecting the cracks) are formed with the cracks 21 as the starting points for brittle fracture and / or crack fracture.

[0117] In the process of forming a network of cracks connecting multiple cracks 21, it is not necessary to apply the second external force described above. If the second external force is not applied, a network of cracks connecting multiple cracks 21 will be formed during the process of forming multiple cracks 21.

[0118] The laminate, guided from the crack roll 550 to the flattening roll 560, is then flattened by the flattening roll 560. The flattening roll 560 is also referred to as the shaping roll.

[0119] Specifically, the laminate is guided between two opposing rolls in the flattening roll 560, and the laminate is pressed between the two rollers. This flattens the surface of the magnetic strip 20 on which the crack 21 is formed.

[0120] The laminated material after the planarization process becomes a magnetic sheet 100. The magnetic sheet 100 is guided to the third winding roll 570 via the guide roll 580. The magnetic sheet 100 is wound onto the third winding roll 570.

[0121] Figure 16 is a longitudinal cross-sectional view illustrating the state of the magnetic tape 20 after it has been cut. When manufacturing the magnetic sheet 100 with the manufacturing apparatus 500, the magnetic strip 20 may be cut, as shown in Figure 16. For example, the magnetic strip 20 may be cut during the process of bonding the magnetic strip 20 to the adhesive layer 10.

[0122] The process of adhering the magnetic strip 20 to the adhesive layer 10 is carried out continuously while each layer is being transported, as shown in Figure 10. If the magnetic strip 20 is cut during this process, it becomes impossible to supply the magnetic strip 20 to the continuously transporting adhesive layer 10, resulting in a region in the longitudinal direction of the adhesive layer 10 where the magnetic strip 20 is not adhered. In this state, the product cannot be used and the entire product may become defective.

[0123] Figure 17 is a longitudinal cross-sectional view illustrating the cutting of a magnetic sheet from which the magnetic strip 20 has been cut. A first cutting step and a second cutting step are performed on the magnetic sheet 100 shown in Figure 16 to remove the portion where the magnetic strip 20 has been cut. The first cutting step is the step of separating the first magnetic sheet 110 from the magnetic sheet 100 where the magnetic strip 20 has been cut at the first cut surface 115. The second cutting step is the step of separating the second magnetic sheet 120 from the magnetic sheet 100 where the magnetic strip 20 has been cut at the second cut surface 125.

[0124] The first cross-section 115 and the second cross-section 125 are cross-sections extending in a direction intersecting the longitudinal direction of the magnetic sheet 100. More preferably, they are cross-sections extending in a direction perpendicular to the longitudinal direction.

[0125] The end of the first magnetic sheet 110 cut by the first cutting surface 115 has a first predetermined shape. The end of the second magnetic sheet 120 cut by the second cutting surface 125 has a second predetermined shape.

[0126] In this embodiment, the first predetermined shape and the second predetermined shape are described in an example where they extend in a straight line when viewed from the stacking direction. However, the first predetermined shape and the second predetermined shape may also be an arc shape or a bent shape when viewed from the stacking direction.

[0127] The first magnetic sheet 110 and the second magnetic sheet 120, separated by the first and second cutting processes, are fixed in place by an adhesive process. Specifically, as shown in Figure 2, they are fixed together by fixing tape 130 in a longitudinally adjacent state. The cut ends of the first magnetic sheet 110 and the cut ends of the second magnetic sheet 120 are adjacent to each other with a distance D of less than or equal to a predetermined value. The magnetic strips 20 of the first magnetic sheet 110 and the magnetic strips 20 of the second magnetic sheet 120 are positioned opposite each other.

[0128] Figure 18 is a schematic diagram illustrating the manufacturing method of the multilayer magnetic sheet 300. The multilayer magnetic sheet 300 is manufactured using the manufacturing apparatus 600 shown in Figure 18. Figure 18 shows the manufacturing apparatus 600 for manufacturing a multilayer magnetic sheet 300 containing five layers of magnetic strips 20.

[0129] The manufacturing apparatus 600 is mainly equipped with a supply roll 601, a resin sheet winding roll 602, a first magnetic sheet unwinding roll 611, a first winding roll 612, a first adhesive roll 613, a second magnetic sheet unwinding roll 621, a second winding roll 622, a second adhesive roll 623, a third magnetic sheet unwinding roll 631, a third winding roll 632, a third adhesive roll 633, a fourth magnetic sheet unwinding roll 641, a fourth winding roll 642, a fourth adhesive roll 643, a fifth magnetic sheet unwinding roll 651, a fifth adhesive roll 653, a flattening roll 663, and a multilayer magnetic sheet winding roll 670, arranged from upstream to downstream in the manufacturing process. The manufacturing apparatus 600 may also be equipped with a number of guide rolls 680. Note that the guide rolls 680 can be placed in positions not described as necessary.

[0130] The manufacturing apparatus 600 may also manufacture a multilayer magnetic sheet 300 having two to four layers of magnetic strips 20. Alternatively, it may manufacture a multilayer magnetic sheet 300 having six or more layers of magnetic strips 20. In this case, the number of the first magnetic sheet unwinding rolls 611, etc., described above will be changed according to the number of magnetic strips 20.

[0131] The upper limit of the number of layers in the magnetic thin strip 20 can be determined as appropriate. For example, it may be 20 layers or 30 layers. However, increasing the number of layers will increase the size of the manufacturing equipment 600, so it is preferable to have 30 layers or less, preferably 25 layers or less, and preferably 20 layers or less. However, if there are many layers, it may become difficult to wind the multilayer magnetic sheet 300, or shape defects may occur during winding. For this reason, when winding the multilayer magnetic sheet 300, it is preferable to have 15 layers or less, and more preferably 10 layers or less. Furthermore, it is preferable to have 3 or more layers in the magnetic thin strip 20, more preferably 4 or more layers, and even more preferably 5 or more layers.

[0132] As shown in Figure 11, a laminate is wound around the supply roll 601, in which a resin sheet 15 is laminated on the first surface 11A and the second surface 11B of the adhesive layer 10. As shown in Figure 12, the laminate unwound from the supply roll 601 has the resin sheet 15 positioned on the first surface 11A peeled off. As shown in Figure 18, the peeled resin sheet 15 is wound onto the resin sheet winding roll 602.

[0133] The laminate from which the resin sheet 15, positioned on the first surface 11A, has been peeled off is guided to the first adhesive roll 613 by the guide roll 680. The magnetic sheet 100, unwound from the first magnetic sheet unwinding roll 611, is further guided to the first adhesive roll 613.

[0134] The first adhesive roll 613 presses the magnetic sheet 100 against the laminate from which the resin sheet 15 has been peeled off, thereby bonding them. Specifically, the laminate and the magnetic sheet 100 are guided between two opposing rolls, and the two rolls are used to press the magnetic strip 20 of the magnetic sheet 100 against the first surface 11A of the adhesive layer 10, as shown in Figure 14, thereby bonding them.

[0135] The magnetic strip 20 to which the magnetic sheet 100 is bonded may be positioned so that its center coincides with the adhesive layer 10 in the width direction, or it may be positioned with its center separated from it. In this case, it is positioned so as to satisfy the relationships 0 mm < gap a and 0 mm < gap b (see Figure 5).

[0136] The resin sheet 15 of the magnetic sheet 100, which has been bonded by the first bonding roll 613, is peeled off the magnetic sheet 100 and wound onto the first winding roll 612. The laminate, after the resin sheet 15 has been wound onto the first winding roll 612, is guided to the second bonding roll 623. The magnetic sheet 100, which has been unwound from the second magnetic sheet unwinding roll 621, is further guided onto the second bonding roll 623.

[0137] The second adhesive roll 623 presses and adheres the magnetic sheet 100 to the laminate guided from the first adhesive roll 613. The magnetic strip 20 to which the magnetic sheet 100 is adhered may be positioned so that its center coincides with the adhesive layer 10 of the laminate guided from the first adhesive roll 613 in the width direction, or it may be positioned with its center separated from the adhesive layer.

[0138] In this case, the arrangement satisfies the relationships 0 mm < gap a and 0 mm < gap b (see Figure 5). The resin sheet 15 of the magnetic sheet 100, which has been bonded by the second bonding roll 623, is peeled off from the magnetic sheet 100 and wound onto the second winding roll 622.

[0139] After the resin sheet 15 is wound onto the second winding roll 622, the laminate is guided to the third bonding roll 633. The magnetic sheet 100, which has been unwound from the third magnetic sheet unwinding roll 631, is further guided to the third bonding roll 633.

[0140] The third adhesive roll 633 presses and adheres the magnetic sheet 100 to the laminate led from the second adhesive roll 623. The magnetic strip 20 to which the magnetic sheet 100 is adhered may be positioned so that its center coincides with the adhesive layer 10 of the laminate led from the second adhesive roll 623 in the width direction, or it may be positioned with its center separated from it.

[0141] In this case, the arrangement satisfies the relationships 0 mm < gap a and 0 mm < gap b (see Figure 5). The resin sheet 15 of the magnetic sheet 100, which has been bonded by the third bonding roll 633, is peeled off from the magnetic sheet 100 and wound onto the third winding roll 632.

[0142] After the resin sheet 15 is wound onto the third winding roll 632, the laminate is guided to the fourth bonding roll 643. The magnetic sheet 100, which has been unwound from the fourth magnetic sheet unwinding roll 641, is further guided to the fourth bonding roll 643.

[0143] The fourth adhesive roll 643 presses and adheres the magnetic sheet 100 to the laminate led from the third adhesive roll 633. The magnetic strip 20 to which the magnetic sheet 100 is adhered may be positioned so that its center coincides with the adhesive layer 10 of the laminate led from the third adhesive roll 633 in the width direction, or it may be positioned with its center separated from it.

[0144] In this case, the arrangement satisfies the relationships 0 mm < gap a and 0 mm < gap b (see Figure 5). The resin sheet 15 of the magnetic sheet 100, which has been bonded by the fourth bonding roll 643, is peeled off from the magnetic sheet 100 and wound onto the fourth winding roll 642.

[0145] After the resin sheet 15 is wound onto the fourth winding roll 642, the laminate is guided to the fifth bonding roll 653. The magnetic sheet 100, which has been unwound from the fifth magnetic sheet unwinding roll 651, is further guided to the fifth bonding roll 653.

[0146] The fifth adhesive roll 653 presses and adheres the magnetic sheet 100 to the laminate led from the fourth adhesive roll 643. The magnetic strip 20 to which the magnetic sheet 100 is adhered may be positioned so that its center coincides with the adhesive layer 10 of the laminate led from the fourth adhesive roll 643 in the width direction, or it may be positioned with its center separated from it.

[0147] In this case, the arrangement satisfies the relationships 0 mm < gap a and 0 mm < gap b (see Figure 5). The laminate guided from the fifth bonding roll 653 to the flattening roll 663 is flattened by the flattening roll 663.

[0148] It is preferable that the relationship between the magnetic strip 20 and the adhesive layer 10 is such that 0 mm < gap a and 0 mm < gap b (see Figure 5), as described above. However, positional misalignment may occur during the lamination process between the magnetic sheet 100 and the laminate. If this misalignment occurs, for example, gap a may become negative in the relationship between the magnetic strip 20 and the adhesive layer 10. In other words, on one side of the magnetic strip 20, the end of the magnetic strip 20 may protrude beyond the end of the adhesive layer 10. Even if the end of the magnetic strip 20 protrudes beyond the end of the adhesive layer 10 on one side of the magnetic strip 20, if the relationship between the magnetic strip 20 and the adhesive layer 10 is such that 0 mm < gap a and 0 mm < gap b (see Figure 5) on the other side of the magnetic strip 20, the magnetic strip 20 can maintain its adherence to the adhesive layer 10.

[0149] The laminated material after the planarization process becomes the multilayer magnetic sheet 300 shown in Figure 6. The multilayer magnetic sheet 300 is guided to the multilayer magnetic sheet winding roll 670 via the guide roll 680. The multilayer magnetic sheet 300 is wound onto the multilayer magnetic sheet winding roll 670.

[0150] In addition to winding the multilayer magnetic sheet 300 onto the multilayer magnetic sheet winding roll 670, the multilayer magnetic sheet 300 may also be cut to the required length.

[0151] Figure 19 is a longitudinal cross-sectional view illustrating the state in which the resin sheet 15 is peeled off from the magnetic sheet 100 in Figure 2. In the manufacturing apparatus 600, the magnetic sheet 100 shown in Figure 2 is bonded to a laminate or the like, and then the resin sheet 15 and fixing tape 130 are peeled off as shown in Figure 19. Specifically, the resin sheet 15 of the first magnetic sheet 110, the resin sheet 15 of the second magnetic sheet 120, and the fixing tape 130 are peeled off together as a single unit.

[0152] At this time, since the magnetic strip 20 of the first magnetic sheet 110 and the magnetic strip 20 of the second magnetic sheet 120 are bonded to the adhesive layer 10 of the other magnetic sheet 100, even if the resin sheet 15 is peeled off together with the fixing tape 130, they can maintain an adjacent state with a distance of less than a predetermined value.

[0153] Figure 20 is a schematic diagram illustrating the manufacturing method of the multilayer magnetic sheet 300T. The multilayer magnetic sheet 300T is manufactured using the manufacturing apparatus 700 shown in Figure 20. Figure 20 shows the manufacturing apparatus 700 for manufacturing the multilayer magnetic sheet 300T, which includes 25 layers of magnetic strips 20.

[0154] The manufacturing method for this multilayer magnetic sheet 300T involves stacking multiple multilayer magnetic sheets 300 to produce the multilayer magnetic sheet 300T. The number of layers of magnetic strips 20 in the multilayer magnetic sheet 300T can be adjusted by changing the number of multilayer magnetic sheets 300 used and the number of magnetic strip layers 20 in the multilayer magnetic sheets 300 used.

[0155] The manufacturing apparatus 700 is mainly equipped with, from upstream to downstream of the manufacturing process, a supply roll 701, a resin sheet winding roll 702, a first multilayer magnetic sheet unwinding roll 711, two first winding rolls 712, a first adhesive roll 713, a second multilayer magnetic sheet unwinding roll 721, two second winding rolls 722, a second adhesive roll 723, a third multilayer magnetic sheet unwinding roll 731, two third winding rolls 732, a third adhesive roll 733, a fourth multilayer magnetic sheet unwinding roll 741, two fourth winding rolls 742, a fourth adhesive roll 743, a fifth multilayer magnetic sheet unwinding roll 751, a fifth winding roll 752, a fifth adhesive roll 753, a flattening roll 763, and a cutting section 770. The manufacturing apparatus 700 may also be equipped with a guide roll 780. Note that the guide roll 780 can be placed in locations not specified, as needed.

[0156] The manufacturing apparatus 700 may produce a multilayer magnetic sheet 300T with 25 to 80 layers of magnetic strips 20. It may also produce a multilayer magnetic sheet 300T with more than 80 layers of magnetic strips 20, or a multilayer magnetic sheet 300T with fewer than 25 layers of magnetic strips 20. The number of magnetic strips 20 in the multilayer magnetic sheet 300T is preferably 10 or more, and more preferably 15 or more. Furthermore, the total number of laminated magnetic strips 20 is preferably 200 or less. In this case, the number of the first multilayer magnetic sheet unwinding rolls 711, etc., described above, is changed according to the number of magnetic strips 20. It is also changed by the number of layers of magnetic strips 20 in the multilayer magnetic sheet 300, such as the first multilayer magnetic sheet 300.

[0157] As shown in Figure 11, a laminate is wound around the supply roll 701, in which a resin sheet 15 is laminated on the first surface 11A and the second surface 11B of the adhesive layer 10. As shown in Figure 12, the laminate unwound from the supply roll 701 has the resin sheet 15 positioned on the first surface 11A peeled off. As shown in Figure 20, the peeled resin sheet 15 is wound onto the resin sheet winding roll 702.

[0158] The laminate from which the resin sheet 15, positioned on the first surface 11A, has been peeled off is guided by the guide roll 780 to the first bonding roll 713. The first bonding roll 713 is further guided by the multilayer magnetic sheet 300 unwound from the first multilayer magnetic sheet unwinding roll 711.

[0159] Alternatively, a multilayer magnetic sheet unwinding roll may be used as the supply roll 701. When a multilayer magnetic sheet unwinding roll is used as the supply roll 701, one of the two resin sheets 15 of the unwound multilayer magnetic sheet is peeled off and guided to the first bonding roll 713.

[0160] The multilayer magnetic sheet 300, guided to the first adhesive roll 713, has the resin sheet 15 facing the laminate guided from the supply roll 701 of the two resin sheets 15 peeled off. The peeled resin sheet 15 is then wound onto the first winding roll 712.

[0161] The first adhesive roll 713 presses and adheres the multilayer magnetic sheet 300, from which the resin sheet 15 has been peeled, to the laminate from which the resin sheet 15 has been peeled. Specifically, the laminate and the multilayer magnetic sheet 300 are guided between two opposing rolls, and the two rolls are used to press and adhere the magnetic strip 20 of the multilayer magnetic sheet 300 to the first surface 11A of the adhesive layer 10, as shown in Figure 20.

[0162] The magnetic strip 20 to which the multilayer magnetic sheet 300 is bonded may be positioned so that its center coincides with the adhesive layer 10 in the width direction, or it may be positioned with its center separated from it. In this case, it is positioned so as to satisfy the relationships 0 mm < gap a and 0 mm < gap b (see Figure 5).

[0163] The remaining resin sheet 15 of the multilayer magnetic sheet 300, which has been bonded by the first bonding roll 713, is peeled off from the multilayer magnetic sheet 300 and wound onto the first winding roll 712. The laminate is then guided to the second bonding roll 723. The second bonding roll 723 is further guided to the multilayer magnetic sheet 300 that has been unwound from the second multilayer magnetic sheet unwinding roll 721.

[0164] As the multilayer magnetic sheet 300 is guided to the second adhesive roll 723, one of the two resin sheets 15, the resin sheet 15 facing the laminate guided from the first adhesive roll 713, is peeled off. The peeled resin sheet 15 is then wound onto the second winding roll 722.

[0165] The second adhesive roll 723 presses and adheres the multilayer magnetic sheet 300 to the laminate led from the first adhesive roll 713. The magnetic strip 20 to which the multilayer magnetic sheet 300 is adhered may be positioned so that its center coincides with the adhesive layer 10 of the laminate led from the first adhesive roll 713 in the width direction, or it may be positioned with a distance between its centers. In this case, it is positioned so as to satisfy the relationships 0 mm < gap a and 0 mm < gap b (see Figure 5).

[0166] The remaining resin sheet 15 of the multilayer magnetic sheet 300, which has been bonded by the second bonding roll 723, is peeled off from the multilayer magnetic sheet 300 and wound onto the second winding roll 722.

[0167] Subsequently, the laminate is guided to the third bonding roll 733. The third bonding roll 733 is further guided to the multilayer magnetic sheet 300 unwound from the third multilayer magnetic sheet unwinding roll 731.

[0168] As the multilayer magnetic sheet 300 is guided to the third adhesive roll 733, one of the two resin sheets 15, the resin sheet 15 facing the laminate guided from the second adhesive roll 723, is peeled off. The peeled resin sheet 15 is then wound onto the third winding roll 732.

[0169] The third adhesive roll 733 presses and adheres the multilayer magnetic sheet 300 to the laminate led from the second adhesive roll 723. The magnetic strip 20 to which the multilayer magnetic sheet 300 is adhered may be positioned so that its center coincides with the adhesive layer 10 of the laminate led from the second adhesive roll 723 in the width direction, or it may be positioned with its center separated from it. In this case, it is positioned so as to satisfy the relationships 0 mm < gap a and 0 mm < gap b (see Figure 5).

[0170] The remaining resin sheet 15 of the multilayer magnetic sheet 300, which has been bonded by the third bonding roll 733, is peeled off from the multilayer magnetic sheet 300 and wound onto the third winding roll 732.

[0171] Subsequently, the laminate is guided to the fourth bonding roll 743. The fourth bonding roll 743 is further guided to the multilayer magnetic sheet 300 unwound from the fourth multilayer magnetic sheet unwinding roll 741.

[0172] As the multilayer magnetic sheet 300 is guided to the fourth adhesive roll 743, one of the two resin sheets 15, the resin sheet 15 facing the laminate guided from the third adhesive roll 733, is peeled off. The peeled resin sheet 15 is then wound onto the fourth winding roll 742.

[0173] The fourth adhesive roll 743 presses and adheres the multilayer magnetic sheet 300 to the laminate led from the third adhesive roll 733. The magnetic strip 20 to which the multilayer magnetic sheet 300 is adhered may be positioned so that its center coincides with the adhesive layer 10 of the laminate led from the third adhesive roll 733 in the width direction, or it may be positioned with its center separated from it. In this case, it is positioned so as to satisfy the relationships 0 mm < gap a and 0 mm < gap b (see Figure 5).

[0174] The remaining resin sheet 15 of the multilayer magnetic sheet 300, which has been bonded by the fourth bonding roll 743, is peeled off from the multilayer magnetic sheet 300 and wound onto the fourth winding roll 742.

[0175] Subsequently, the laminate is guided to the fifth bonding roll 753. The fifth bonding roll 753 is further guided to the multilayer magnetic sheet 300 unwound from the fifth multilayer magnetic sheet unwinding roll 751.

[0176] As the multilayer magnetic sheet 300 is guided to the fifth adhesive roll 753, one of the two resin sheets 15, the resin sheet 15 facing the laminate guided from the fourth adhesive roll 743, is peeled off. The peeled resin sheet 15 is then wound onto the fifth winding roll 752.

[0177] The fifth adhesive roll 753 presses and adheres the multilayer magnetic sheet 300 to the laminate led from the fourth adhesive roll 743. The magnetic strip 20 to which the multilayer magnetic sheet 300 is adhered may be positioned so that its center coincides with the adhesive layer 10 of the laminate led from the fourth adhesive roll 743 in the width direction, or it may be positioned with a distance between its centers. In this case, it is positioned to satisfy the relationships 0 mm < gap a and 0 mm < gap b (see Figure 5).

[0178] The laminate, guided from the fifth bonding roll 753 to the flattening roll 763, is flattened by the flattening roll 763.

[0179] The laminated material after the planarization process becomes the multilayer magnetic sheet 300T shown in Figure 9. The multilayer magnetic sheet 300T is cut to a desired length at the cutting section 770. The desired length can be, for example, 100 mm or more and 500 mm or less. The length of the multilayer magnetic sheet 300T can be appropriately changed based on the specifications required for the multilayer magnetic sheet 300T. The multilayer magnetic sheet 300T may also be wound up if it has a windable number of layers. After that, it may be cut to the desired length and used.

[0180] Here, a multilayer magnetic sheet 300T with 25 layers of magnetic strips 20 was manufactured by laminating a multilayer magnetic sheet 300 with 5 layers of magnetic strips 20 five times. However, a multilayer magnetic sheet 300T with 50 layers of magnetic strips 20 may be manufactured by further laminating the 25-layer multilayer magnetic sheet 300T.

[0181] By setting the number of magnetic strips 20 in the multilayer magnetic sheet 300T to approximately 25 to 80 layers, the multilayer magnetic sheet 300T can be used for contactless charging of mobile objects such as automobiles. The number of magnetic strips 20 may be 80 or more. Preferably, it is 20 layers or less.

[0182] Furthermore, the number of layers of magnetic strips 20 in the laminated multilayer magnetic sheet 300 may be changed based on the number of magnetic strip layers 20 in the final multilayer magnetic sheet 300T.

[0183] Furthermore, the number of magnetic strip layers 20 in each of the multiple multilayer magnetic sheets 300 to be stacked may differ. In other words, a multilayer magnetic sheet 300T may be manufactured by a combination of multiple multilayer magnetic sheets 300 with different numbers of magnetic strip layers 20.

[0184] By manufacturing the multilayer magnetic sheet 300T using the manufacturing equipment 700, it is easier to miniaturize the equipment compared to manufacturing it using the manufacturing equipment 600. When manufacturing using the manufacturing equipment 600, it is necessary to arrange the first magnetic sheet unwinding roll 611, on which the magnetic sheet 100 is wound, for the number of layers of the magnetic strip 20, which tends to make the manufacturing equipment 600 larger.

[0185] In contrast, the manufacturing apparatus 700 uses a first multilayer magnetic sheet unwinding roll 711 around which the multilayer magnetic sheet 300 is wound, making it easier to miniaturize the manufacturing apparatus. In other words, it is easier to manufacture the multilayer magnetic sheet 300T.

[0186] According to the magnetic sheet 100 and the method for manufacturing the magnetic sheet 100 of this disclosure, the first magnetic sheet 110 and the second magnetic sheet 120 are fixed adjacent to each other by fixing tape 130. Furthermore, the first magnetic sheet 110 and the second magnetic sheet 120 are fixed adjacent to each other with magnetic strips 20 spaced at or below a predetermined interval D. The fixing tape 130 adhered to the resin sheet 15 in the first magnetic sheet 110 and the resin sheet 15 in the second magnetic sheet 120 can be peeled off from the adhesive layer 10 together with the resin sheet 15.

[0187] Since the magnetic strips 20 are adjacent to each other at intervals D of a predetermined value or less, it is easier to suppress the deterioration of properties caused by areas where the magnetic strips 20 are not provided. In other words, the magnetic sheet 100, including the first magnetic sheet 110 and the second magnetic sheet 120, is less likely to have its desired properties compromised.

[0188] In a laminate formed by laminating an adhesive layer 10 and a magnetic strip 20, even if the magnetic strip 20 is cut and has a discontinuous portion in the longitudinal direction, the laminate can still be used as a magnetic sheet 100. In other words, the discontinuous portion of the magnetic strip 20 in the laminate can be cut and removed. The remaining portion of the laminate after removing the discontinuous portion becomes the first magnetic sheet 110 and the second magnetic sheet 120, and by fixing the first magnetic sheet 110 and the second magnetic sheet 120 with fixing tape 130, it can be used as a magnetic sheet 100.

[0189] In a laminate formed by laminating an adhesive layer 10 and a magnetic strip 20, even if the longitudinal length of the laminate is shorter than a desired value, the laminate can still be used as a magnetic sheet 100. In other words, by using a laminate shorter than the desired value and other laminates as the first magnetic sheet 110 and the second magnetic sheet 120, and fixing the first magnetic sheet 110 and the second magnetic sheet 120 with fixing tape 130, a magnetic sheet 100 can be made with a longitudinal length equal to or greater than the desired value.

[0190] According to the multilayer magnetic sheet 300 and multilayer magnetic sheet 300T of this disclosure, since the magnetic strips 20 are adjacent to each other at intervals D of a predetermined value or less, it is easy to suppress the deterioration of properties caused by areas where magnetic strips 20 are not provided. Even if at least one layer of magnetic strip 20 has an interval D, the magnetic strips 20 are arranged continuously in the locations corresponding to the interval D in the other magnetic strips 20. Therefore, even if at least one layer of magnetic strip 20 has an interval D, the multilayer magnetic sheet 300 and multilayer magnetic sheet 300T are less likely to impair the desired properties. Here, the number of layers of magnetic strips 20 included in the multilayer magnetic sheet 300 and multilayer magnetic sheet 300T is preferably 10 or more, and more preferably 25 or more.

[0191] In a laminate formed by laminating an adhesive layer 10 and a magnetic strip 20, even if the magnetic strip 20 is cut and has a discontinuous portion in the longitudinal direction, the laminate can still be used to form a multilayer magnetic sheet 300 and a multilayer magnetic sheet 300T. In other words, the discontinuous portion of the magnetic strip 20 in the laminate can be cut and removed. The remaining portion of the laminate, after removing the discontinuous portion, can be placed adjacent to each other at an interval D of a predetermined value or less, making it possible to use it to form a multilayer magnetic sheet 300 and a multilayer magnetic sheet 300T.

[0192] In a laminate formed by laminating an adhesive layer 10 and a magnetic thin strip 20, even if the longitudinal length of the laminate is shorter than a desired value, the laminate can be used to form a multilayer magnetic sheet 300 and a multilayer magnetic sheet 300T. In other words, by placing a laminate shorter than the desired value and other laminates adjacent to each other at an interval D of less than or equal to a first predetermined value, the laminate can be used to form a multilayer magnetic sheet 300 and a multilayer magnetic sheet 300T whose longitudinal length is equal to or greater than the desired value.

[0193] By making the edges 111 of the first magnetic sheet 110 and the edges 121 of the second magnetic sheet 120 extend in a straight line when viewed from the stacking direction, it becomes easier to fix the first magnetic sheet 110 and the second magnetic sheet 120 adjacent to each other.

[0194] The width A of the area on the adhesive layer 10 where the adhesive 12 is provided is wider than the width B of the magnetic strip 20. When attaching the magnetic strip 20 to the adhesive layer 10, even if the adhesive layer 10 or the magnetic strip 20 becomes meandering, the adhesive 12 of the adhesive layer 10 is more likely to be distributed over the entire surface of the magnetic strip 20.

[0195] By setting the value obtained by subtracting width B from width A to 0.2 mm or more, it is easier to prevent the occurrence of areas on the magnetic strip 20 where the adhesive 12 is not present when attaching the magnetic strip 20 to the adhesive layer 10. By setting the value obtained by subtracting width B from width A to 3 mm or less, it is easier to prevent the area on the magnetic sheet 100 where the magnetic strip 20 is not present from becoming large. In addition, it is easier to prevent the spacing between magnetic strips from becoming large when magnetic sheets are arranged in parallel.

[0196] By making the magnetic thin strip 20 an amorphous alloy thin strip or a nanocrystalline alloy thin strip, it is possible to make the magnetic thin strip 20 a soft magnetic thin strip. Furthermore, the magnetic thin strip 20 can be formed using an alloy.

[0197] By incorporating multiple small pieces 22 into the magnetic strip 20, it becomes easier to improve the properties of the magnetic sheet 100, the multilayer magnetic sheet 300, and the multilayer magnetic sheet 300T. Specifically, when the magnetic sheet 100, the multilayer magnetic sheet 300, and the multilayer magnetic sheet 300T are used as magnetic materials for inductors, it becomes easier to improve the Q value. Furthermore, when the magnetic sheet 100, the multilayer magnetic sheet 300, and the multilayer magnetic sheet 300T are used as magnetic materials for magnetic shielding, it becomes easier to reduce eddy current losses by interrupting the current path in the magnetic strip 20.

[0198] By providing a resin sheet 15 at the first laminated end 301 or the second laminated end 302, it becomes easier to protect the manufactured multilayer magnetic sheets 300 and 300T. For example, it becomes easier to prevent damage to the adhesive layer 10 and magnetic strip 20 when transporting the manufactured multilayer magnetic sheets 300 and 300T.

[0199] Furthermore, an amorphous alloy strip, a nanocrystalline alloy strip, or other magnetic material, such as a metal foil made of aluminum, or a resin sheet may be attached to the first laminated end 301.

[0200] By laminating two or more adhesive layers 10 between at least one of the adjacent magnetic thin strips 20, it becomes easier to manufacture a multilayer magnetic sheet 300T having 10 or more magnetic thin strips 20.

[0201] The scope of this disclosure is not limited to the embodiments described above, and various modifications can be made without departing from the spirit of this disclosure. For example, the magnetic sheet 100, multilayer magnetic sheet 300, and multilayer magnetic sheet 300T according to this disclosure can be used as inductive elements and the like. [Explanation of symbols]

[0202] 10...Adhesive layer, 11...Support, 11A...First surface, 11B...Second surface, 12...Adhesive, 15...Resin sheet, 20...Magnetic strip, 22...Small piece, 100...Magnetic sheet, 110...First magnetic sheet, 111...End, 120...Second magnetic sheet, 121...End, 130...Fixing tape, 300...Multilayer magnetic sheet, 300T...Multilayer magnetic sheet, 301...First laminate end, 302...Second laminate end D...interval

Claims

1. A support formed in a strip shape, and an adhesive layer having an adhesive provided on the first and second surfaces of the support, A magnetic thin strip formed in a strip shape using a magnetic material, and bonded to the adhesive on the first surface of the adhesive layer, A resin sheet formed in a strip shape using a resin material and placed on the adhesive on the second surface of the adhesive layer, A first magnetic sheet and a second magnetic sheet are provided with A tape for fixing the longitudinal end of the magnetic strip in the first magnetic sheet and the longitudinal end of the magnetic strip in the second magnetic sheet adjacent to each other at a distance of less than or equal to a predetermined value, wherein the fixing tape is bonded across the resin sheet in the first magnetic sheet and the resin sheet in the second magnetic sheet, A magnetic sheet with a magnetic surface.

2. The magnetic sheet according to claim 1, wherein the end of the first magnetic sheet and the end of the second magnetic sheet have a shape that extends in a straight line when viewed from the lamination direction of the magnetic strip and the adhesive layer.

3. The dimensions of the adhesive layer, wherein the dimension in the direction intersecting the longitudinal direction of the adhesive layer is width A, The magnetic sheet according to claim 1 or 2, wherein the dimensions of the magnetic thin strip satisfy the relationship 0.2 mm ≤ (width A - width B) ≤ 3 mm, when the width B is the dimension in the direction intersecting the longitudinal direction of the magnetic thin strip.

4. The magnetic sheet according to claim 1 or 2, wherein the magnetic band is an amorphous alloy band or a nanocrystalline alloy band.

5. The magnetic sheet according to claim 1 or 2, wherein the magnetic band is a nanocrystalline alloy band and comprises a plurality of small pieces.

6. A first cutting step involves cutting a first magnetic sheet, which includes a support formed in a strip shape, an adhesive layer having an adhesive provided on a first surface and a second surface of the support, a magnetic strip formed in a strip shape using a magnetic material and adhered to the adhesive on the first surface of the adhesive layer, and a resin sheet formed in a strip shape using a resin material and placed on the adhesive on the second surface of the adhesive layer, into a first predetermined shape in a direction intersecting the longitudinal direction. A second cutting step involves cutting a second magnetic sheet, which is provided with the adhesive layer, the magnetic strip, and the resin sheet, into a second predetermined shape corresponding to the first predetermined shape in a direction intersecting the longitudinal direction. The cutting edges of the first magnetic sheet and the cutting edges of the second magnetic sheet are placed adjacent to each other at an interval of less than or equal to a predetermined value, the magnetic strip of the first magnetic sheet and the magnetic strip of the second magnetic sheet are placed opposite each other, and a fixing tape is bonded to the resin sheet of the first magnetic sheet and the resin sheet of the second magnetic sheet. A method for manufacturing a magnetic sheet having [the same properties].

7. The dimensions of the adhesive layer, wherein the dimension in the direction intersecting the longitudinal direction of the adhesive layer is width A, The method for manufacturing a magnetic sheet according to claim 6, wherein the dimensions of the magnetic thin strip satisfy the relationship 0.2 mm ≤ (width A - width B) ≤ 3 mm, when the width B is the dimension in the direction intersecting the longitudinal direction of the magnetic thin strip.

8. The method for manufacturing a magnetic sheet according to claim 6 or 7, wherein the magnetic band is an amorphous alloy band or a nanocrystalline alloy band.

9. The method for manufacturing a magnetic sheet according to claim 6 or 7, wherein the magnetic thin band is a nanocrystalline alloy thin band and comprises a plurality of small pieces.

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