Thermoelectric conversion sheet and method for manufacturing thermoelectric conversion sheet

Abstract

To provide a thermoelectric conversion sheet and a manufacturing method of the same.SOLUTION: A thermoelectric conversion sheet comprises: first magnetic wiring 12L which is magnetized in a first direction Dx and extends in a second direction Dy; second magnetic wiring 22L which is magnetized in the direction opposite to the first direction Dx and extends in the second direction Dy; a first sheet 11 which supports the first magnetic wiring 12L; and a second sheet 21 which supports the second magnetic wiring 22L. The first magnetic wiring 12L and the second magnetic wiring 22L are located between the first sheet 11 and the second sheet 21, extend in the first direction Dx and constitute the same polarity series circuit. The adhesion of the first magnetic wiring 12L to the first sheet 11 is higher than the adhesion of the first magnetic wiring 12L to the second sheet 21. The adhesion of the second magnetic wiring 22L to the second sheet 21 is higher than the adhesion of the second magnetic wiring 22L to the first sheet 11.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present disclosure relates to a thermoelectric conversion sheet and a method for producing a thermoelectric conversion sheet. [Background technology]

[0002] Thermoelectric conversion sheets utilize the anomalous Nernst or spin Seebeck effect of magnetic materials. Thermoelectric conversion sheets generate voltage in the cross product direction of the direction in which a temperature gradient occurs and the magnetization direction of the magnetic material. For example, a thermoelectric conversion element having a magnetic material whose magnetization direction is the Y direction is given a temperature gradient in the Z direction perpendicular to the Y direction, which generates a voltage in the X direction perpendicular to the Y direction and the Z direction. For thermoelectric conversion sheets that can obtain a higher voltage the greater the distance in the X direction, a technology has been proposed in which the circumferential direction of the roll is made the X direction in order to increase the output voltage (see, for example, Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2009-130070 A Summary of the Invention [Problem to be solved by the invention]

[0004] While a sheet configuration that generates a voltage in the circumferential direction of the roll makes it possible to increase the output voltage, it limits the structure of the thermoelectric conversion sheet to a roll shape. Therefore, there is a strong demand for a new structure for the thermoelectric conversion sheet that can increase the output voltage even in a structure other than a roll shape. [Means for solving the problem]

[0005] A thermoelectric conversion sheet for solving the above problems includes a first magnetic wiring magnetized in a first direction and extending in a second direction perpendicular to the first direction, a second magnetic wiring magnetized in a direction opposite to the first direction and extending in the second direction, a first sheet supporting the first magnetic wiring, and a second sheet supporting the second magnetic wiring. The first magnetic wiring and the second magnetic wiring are located between the first sheet and the second sheet and are aligned in the first direction. An end of the first magnetic wiring in the second direction is electrically connected to an end of the second magnetic wiring in the second direction, and the adhesion of the first magnetic wiring to the first sheet is higher than the adhesion of the first magnetic wiring to the second sheet, and the adhesion of the second magnetic wiring to the second sheet is higher than the adhesion of the second magnetic wiring to the first sheet.

[0006] According to the thermoelectric conversion sheet, two mutually parallel magnetic wires are arranged between the first sheet and the second sheet. One of the two magnetic wires is connected to the other magnetic wire so as to form a same-polarity series circuit. This increases the output voltage per volume in the thermoelectric conversion sheet compared to one magnetic layer having a volume equivalent to two magnetic wires. As a result, the output voltage of the thermoelectric conversion sheet is increased whether the structure of the thermoelectric conversion sheet is a roll or a flat structure.

[0007] Moreover, each magnetic wiring has high adhesion to the other sheet and low adhesion to the other sheet. This makes it possible to adopt a manufacturing method in which each magnetic wiring is formed on a separate sheet. That is, it becomes possible to adopt a manufacturing method in which a second sheet is overlaid on a first sheet so that the surface on which the first magnetic wiring is formed faces the surface on which the second magnetic wiring is formed. With this manufacturing method, it is easy to give opposing magnetization directions to two magnetic wirings that are parallel to each other.

[0008] A method for manufacturing a thermoelectric conversion sheet to solve the above problem includes forming a first magnetic wiring on a first surface, the first magnetic wiring being magnetized in a first direction and extending in a second direction perpendicular to the first direction; forming a second magnetic wiring on a second surface, the second surface being magnetized so that its magnetization direction is parallel to the first direction and extending in the second direction; facing the second surface to the first surface so that the magnetization direction of the first magnetic wiring is opposite to the magnetization direction of the second magnetic wiring, arranging the first magnetic wiring and the second magnetic wiring in the first direction between the first surface and the second surface, and electrically connecting an end of the first magnetic wiring in the second direction to an end of the second magnetic wiring in the second direction.

[0009] According to the above manufacturing method, two magnetic wirings parallel to each other are arranged between the first surface and the second surface. One of the two magnetic wirings is connected to the other magnetic wiring so as to form a same-polarity series circuit. This increases the output voltage per volume of the thermoelectric conversion sheet compared to a single magnetic layer having a volume equivalent to two magnetic wirings. As a result, the output voltage of the thermoelectric conversion sheet is increased regardless of whether the structure of the thermoelectric conversion sheet is a roll or a flat surface.

[0010] Moreover, the first surface on which the first magnetic wiring is formed is different from the second surface on which the second magnetic wiring is formed. Therefore, it is possible to prevent the magnetization process for forming the first magnetic wiring from affecting the second magnetic wiring, and also to prevent the magnetization process for forming the second magnetic wiring from affecting the first magnetic wiring. Alternatively, it is possible to make the magnetization direction of the first magnetic wiring and the magnetization direction of the second magnetic wiring opposite to each other by commonizing the magnetization process for forming the first magnetic wiring and the magnetization process for forming the second magnetic wiring, and by rotating the second surface relative to the first surface. As a result, it is easy to give opposite magnetization directions to two magnetic wirings that are parallel to each other.

[0011] In the above thermoelectric conversion sheet, the first sheet may further include a first connection portion extending from an end of the first magnetic wiring in the second direction toward an end of the second magnetic wiring in the second direction, and the end of the first magnetic wiring in the second direction may be electrically connected to the end of the second magnetic wiring in the second direction via the first connection portion.

[0012] According to the above configuration, since the first connection portion of the first magnetic wiring extends toward the tip of the second magnetic wiring, it is also easy to connect the second magnetic wiring to the first magnetic wiring. In the above thermoelectric conversion sheet, the second sheet may further include a second connection portion extending from an end of the second magnetic wiring in the second direction toward the first connection portion, the first connection portion being connected to the second connection portion, and the length of the first connection portion in the second direction may be greater than the length of the first magnetic wiring in the first direction.

[0013] According to the above configuration, the first connection portion extending from the first magnetic wiring toward the tip of the second magnetic wiring is connected to the second connection portion extending from the second magnetic wiring toward the first connection portion. In this case, the length of the first connection portion in the second direction is greater than the length of the first magnetic wiring in the first direction. Therefore, the first magnetic wiring is more easily electrically connected to the second magnetic wiring than in a configuration in which the first magnetic wiring is simply bent toward the second magnetic wiring.

[0014] In the thermoelectric conversion sheet, the first magnetic wiring is electrically connected to the second magnetic wiring by overlapping the first connection portion on the second connection portion, and the thickness of the first connection portion may be thinner than the thickness of the first magnetic wiring.

[0015] According to the above configuration, since the thickness of the first connection part is thinner than the thickness of the first magnetic wiring, in a configuration in which the first connection part is overlapped with the second connection part, the gap between the first surface and the second surface is prevented from becoming wider than the thickness of the first magnetic wiring, and therefore the temperature difference between the first surface and the second surface is easily transmitted to the first magnetic wiring.

[0016] In the above thermoelectric conversion sheet, the second sheet further includes a second connection portion extending from an end of the second magnetic wiring in the second direction toward the first connection portion, the first connection portion being spaced apart from the end of the first magnetic wiring in the second direction, the second connection portion being spaced apart from the end of the second magnetic wiring in the second direction, the first connection portion connecting the second connection portion to the end of the second magnetic wiring in the second direction, and the second connection portion connecting the first connection portion to the end of the first magnetic wiring in the second direction.

[0017] According to the above configuration, the first connection part is a different member from the first magnetic wiring, and the second connection part is a different member from the second magnetic wiring. This allows a material or structure specialized for electrically connecting the second magnetic wiring to the first magnetic wiring to be applied to the first connection part. Also, a material or structure specialized for electrically connecting the second magnetic wiring to the first magnetic wiring to be applied to the second connection part. As a result, the reliability of electrically connecting the second magnetic wiring to the first magnetic wiring is improved.

[0018] In the above thermoelectric conversion sheet, the second magnetic wiring may have a shape that is rotationally symmetrical to the shape of the first magnetic wiring with respect to a rotation axis that extends in the second direction. According to the above configuration, since the shape of the second magnetic wiring is rotationally symmetrical to the shape of the first magnetic wiring, the thermoelectric conversion characteristics of the first magnetic wiring and the thermoelectric conversion characteristics of the second magnetic wiring can be made uniform.

[0019] In the above manufacturing method, forming the first magnetic wiring may mean forming the first magnetic wiring on a first sheet having the first surface, forming the second magnetic wiring may mean forming the first magnetic wiring on a second sheet having the second surface, and opposing the first surface and the second surface may mean opposing the second surface of the second sheet to the first surface of the first sheet.

[0020] According to the above manufacturing method, the sheet on which the magnetization process for forming the first magnetic wiring is performed is different from the sheet on which the magnetization process for forming the second magnetic wiring is performed, which enhances the effectiveness of the effect of preventing the magnetization process for forming the first magnetic wiring from affecting the second magnetic wiring and preventing the magnetization process for forming the second magnetic wiring from affecting the first magnetic wiring.

[0021] In the above manufacturing method, forming the first magnetic wiring may mean forming the first magnetic wiring on a sheet having the first surface, forming the second magnetic wiring may mean forming the first magnetic wiring on the sheet having the second surface, and opposing the first surface to the second surface may mean separating a first portion of the sheet having the first surface and a second portion of the sheet having the second surface, and opposing the first surface of the first portion to the second surface of the second portion.

[0022] According to the above manufacturing method, the first magnetic wiring and the second magnetic wiring are formed on a single sheet, thereby reducing the number of parts required to manufacture the thermoelectric conversion sheet compared to a manufacturing method in which the first magnetic wiring and the second magnetic wiring are each formed on separate sheets. [Brief description of the drawings]

[0023] [Figure 1] FIG. 2 is an exploded perspective view showing a layer structure of a thermoelectric conversion sheet. [Diagram 2] FIG. 13 is a plan view showing the arrangement of magnetic wiring together with an external load. [Diagram 3] FIG. 3 is a cross-sectional view taken along line III-III in FIG. 2. [Figure 4] FIG. 11 is a plan view showing a step of forming a magnetic wiring. [Diagram 5] 11 is a plan view showing a step of connecting the second magnetic wiring to the first magnetic wiring. FIG. [Figure 6] FIG. 4 is a plan view showing the structure of a connection portion. [Figure 7] FIG. 4 is a plan view showing the structure of a connection portion. [Figure 8]FIG. 4 is a plan view showing the structure of a connection portion. [Figure 9] 11 is a cross-sectional view showing a configuration in which a second magnetic wiring is connected to a first magnetic wiring. FIG. [Figure 10] 11 is a cross-sectional view showing a configuration in which a second magnetic wiring is connected to a first magnetic wiring. FIG. [Figure 11] 11 is a cross-sectional view showing a configuration in which a second magnetic wiring is connected to a first magnetic wiring. FIG. [Figure 12] FIG. 2 is a cross-sectional view showing a layer structure of a thermoelectric conversion sheet. [Figure 13] FIG. 2 is a cross-sectional view showing a layer structure of a thermoelectric conversion sheet. [Figure 14] FIG. 4 is a plan view for explaining a method for manufacturing a thermoelectric conversion sheet. [Figure 15] 4 is a plan view showing an example of the arrangement of the first magnetic wiring and the second magnetic wiring. FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0024] An embodiment of a thermoelectric conversion sheet and a method for manufacturing a thermoelectric conversion sheet will be described below. [Seat configuration] As shown in FIG. 1, the thermoelectric conversion sheet includes a first sheet 11, a first thermoelectric conversion section 12, a second sheet 21, and a second thermoelectric conversion section 22.

[0025] Each of the sheets 11 and 21 is electrically insulated from the first magnetic wiring 12L and the second magnetic wiring 22L. Each of the sheets 11 and 21 may be composed of one layer or multiple layers. The material constituting each of the sheets 11 and 21 may be an organic compound, an inorganic compound, or an organic-inorganic composite material. The material constituting the first sheet 11 may be the same as the material constituting the second sheet 21, or may be different from the material constituting the second sheet 21.

[0026] When high thermal conductivity is required for each of the sheets 11 and 21, or when common components are required among the thermoelectric conversion sheets, the material constituting the first sheet 11 is preferably the same as the material constituting the second sheet 21. When flexibility is required for the thermoelectric conversion sheets, the materials constituting the sheets 11 and 21 are preferably organic compounds.

[0027] An example of the organic compound constituting each of the sheets 11 and 21 is at least one resin selected from the group consisting of polyimide, polyethylene, polypropylene, polyethylene terephthalate, polycarbonate, and acrylic resin. An example of the inorganic compound constituting each of the sheets 11 and 21 is at least one selected from the group consisting of silicon oxide, silicon nitride, silicon oxynitride, and magnesium oxide. An example of the inorganic-organic composite material constituting each of the sheets 11 and 21 is silicon oxide containing cellulose fiber.

[0028] When the thermoelectric conversion sheet is required to have heat resistance, each of the sheets 11 and 21 preferably includes a polyimide layer.When the thermoelectric conversion sheet is required to have mechanical durability, each of the sheets 11 and 21 preferably includes a polycarbonate layer.

[0029] The size in the planar direction of each of the sheets 11, 21 is appropriately selected according to the dimensions required for the thermoelectric conversion sheet. When the thermoelectric conversion sheet is required to be flexible and each of the sheets 11, 21 is required to have high thermal conductivity, the thickness of each of the sheets 11, 21 is preferably 25 μm or more and 250 μm or less.

[0030] The size in the planar direction of the first sheet 11 may be the same as the size in the planar direction of the second sheet 21, or may be different from the size in the planar direction of the second sheet 21. The thickness of the first sheet 11 may be the same as the thickness of the second sheet 21, or may be different from the thickness of the second sheet 21.

[0031] When the uniformity of thermal conductivity in the first sheet 11 is required to be equal to the uniformity of thermal conductivity in the second sheet 21, it is preferable that the dimensions of the first sheet 11 are equal to the dimensions of the second sheet 21. When commonality of components is required among the thermoelectric conversion sheets, it is preferable that the dimensions of the first sheet 11 are equal to the dimensions of the second sheet 21.

[0032] [Wiring configuration] The first sheet 11 has a first surface 11a facing the second sheet 21. The second sheet 21 has a second surface 21a facing the first sheet 11. The thermoelectric conversion sheet has a first thermoelectric conversion part 12 and a second thermoelectric conversion part 22 between the first surface 11a and the second surface 21a.

[0033] The first thermoelectric conversion unit 12 is joined to the first surface 11a. The first sheet 11 supports the first thermoelectric conversion unit 12. The first thermoelectric conversion unit 12 includes a first magnetic wiring 12L and a first tip connection unit 12E2. The first thermoelectric conversion unit 12 further includes a first base end connection unit 12E1.

[0034] The second thermoelectric conversion unit 22 is joined to the second surface 21a. The second sheet 21 supports the second thermoelectric conversion unit 22. The second thermoelectric conversion unit 22 includes a first magnetic wiring 12L and a first base end connecting portion 12E1. The second thermoelectric conversion unit 22 further includes a first tip connecting portion 12E2.

[0035] The first magnetic wiring 12L is a linear portion extending in one direction in the first thermoelectric conversion unit 12. The second magnetic wiring 22L is a linear portion extending in one direction in the second thermoelectric conversion unit 22.

[0036] The magnetic wires 12L, 22L extend in the second direction Dy. The magnetic wires 12L, 22L are located on multiple straight lines parallel to each other and between the first sheet 11 and the second sheet 21. The magnetic wires 12L, 22L are arranged in a direction that intersects with the second direction Dy.

[0037] Each of the magnetic wirings 12L, 22L may be composed of one layer or multiple layers. The material of each of the magnetic wirings 12L, 22L exhibits the anomalous Nernst effect. Alternatively, the material of each of the magnetic wirings 12L, 22L exhibits the spin Seebeck effect. The magnetization direction of the first magnetic wiring 12L is a first direction Dx. The first direction Dx is a direction perpendicular to the second direction Dy in the first surface 11a. The magnetization direction of the second magnetic wiring 22L is opposite to the first direction Dx.

[0038] A direction perpendicular to the first direction Dx and the second direction Dy is a third direction Dz. The second sheet 21 is located in the third direction Dz of the first sheet 11. A thermal gradient is applied to the thermoelectric conversion sheet in the third direction Dz when a voltage is output.

[0039] When the thermoelectric conversion sheet uses the anomalous Nernst effect, each of the magnetic wirings 12L, 22L may further include a metal layer having a lower resistance than the magnetic material in order to reduce the wiring resistance of each of the magnetic wirings 12L, 22L. When the thermoelectric conversion sheet uses the spin Seebeck effect, each of the magnetic wirings 12L, 22L includes a layer made of a magnetic material and a metal layer through which a spin current flows from the magnetic material.

[0040] The magnetic material exhibiting the anomalous Nernst effect may be a ferromagnetic material, a ferrimagnetic material, or an antiferromagnetic material. An example of the magnetic material exhibiting the anomalous Nernst effect is at least one selected from the group consisting of a manganese germanium alloy, a manganese tin alloy, a cobalt manganese gallium alloy, a cobalt manganese germanium alloy, an iron aluminum alloy, and an iron gallium alloy.

[0041] The magnetic material exhibiting the spin Seebeck effect may be a ferromagnetic material, a ferrimagnetic material, or an antiferromagnetic material. The magnetic material exhibiting the spin Seebeck effect may be a metal, a semiconductor, or an insulator. An example of the magnetic material exhibiting the spin Seebeck effect is at least one selected from the group consisting of nickel iron, nickel copper, cobalt copper, yttrium iron, yttrium iron garnet, and yttrium gallium iron garnet.

[0042] The layers constituting the magnetic wirings 12L, 22L may be made of a single material or a plurality of materials. When the layers constituting the magnetic wirings 12L, 22L are made of a plurality of materials, the layers constituting the magnetic wirings 12L, 22L may be made of particles made of a magnetic material and a binder resin that bonds the particles. An example of the binder resin is at least one resin selected from the group consisting of polyethylene, polyester, and acrylic resin.

[0043] An example of the direction in which the magnetic wires 12L and 22L are arranged is the first direction Dx. The first direction Dx is a direction parallel to the magnetization direction of the magnetic wires 12L and 22L. The direction in which the magnetic wires 12L and 22L are arranged may be a direction along the first surface 11a that intersects with the first direction Dx and the second direction Dy.

[0044] The length of the first magnetic wiring 12L in the second direction Dy may be equal to or different from the length of the second magnetic wiring 22L in the second direction Dy. When each surface 11a, 21a is rectangular, it is preferable that the length of the first magnetic wiring 12L in the second direction Dy is equal to the length of the second magnetic wiring 22L in the second direction Dy so that the occupied area of ​​all the magnetic wirings 12L, 22L is maximized on each surface 11a, 21a. On the other hand, when each surface 11a, 21a is irregular, it is preferable that the length of the first magnetic wiring 12L in the second direction Dy is different from the length of the second magnetic wiring 22L in the second direction Dy so that the occupied area of ​​all the magnetic wirings 12L, 22L is maximized on each surface 11a, 21a.

[0045] The tip of the first magnetic wiring 12L in the second direction Dy may be located in the first direction Dx with respect to the tip of the second magnetic wiring 22L in the second direction Dy, or may be deviated from the first direction Dx. The base end of the first magnetic wiring 12L in the second direction Dy may be located in the opposite direction of the first direction Dx with respect to the base end of the second magnetic wiring 22L in the second direction Dy, or may be away from the opposite direction of the first direction Dx. For example, when each surface 11a, 21a is rectangular, it is preferable that the tip of the first magnetic wiring 12L is located in the first direction Dx with respect to the tip of the second magnetic wiring 22L so that the occupation area of ​​the magnetic wirings 12L, 22L is maximized on each surface 11a, 21a. In addition, it is preferable that the base end of the first magnetic wiring 12L in the second direction Dy is located in the opposite direction of the first direction Dx with respect to the base end of the second magnetic wiring 22L in the second direction Dy.

[0046] The number of the first magnetic wirings 12L is equal to the number of the second magnetic wirings 22L. The number of the first magnetic wirings 12L in one thermoelectric conversion sheet is appropriately selected according to the level of output voltage required for the thermoelectric conversion sheet. The number of each of the magnetic wirings 12L, 22L in one thermoelectric conversion sheet may be one or two or more. When it is required to increase the output voltage of the thermoelectric conversion sheet, it is preferable that the number of the first magnetic wirings 12L in one thermoelectric conversion sheet is large.

[0047] [Connection configuration] The first base end connecting portion 12E1 is conductive. The first base end connecting portion 12E1 is connected to the base end of the first magnetic wire 12L in the second direction Dy. The first base end connecting portion 12E1 is supported by the first surface 11a, just like the first magnetic wire 12L.

[0048] The first base end connection portion 12E1 may extend from the base end of the first magnetic wiring 12L as one unit with the first magnetic wiring 12L, or may be joined to the base end of the first magnetic wiring 12L as a separate body from the first magnetic wiring 12L. The material constituting the first base end connection portion 12E1 may be the same as the material constituting the first magnetic wiring 12L, or may be a conductive material different from the material constituting the first magnetic wiring 12L.

[0049] The first tip connection portion 12E2 is an example of a first connection portion. The first tip connection portion 12E2 is conductive. The first tip connection portion 12E2 is connected to the tip of the first magnetic wiring 12L in the second direction Dy. The first tip connection portion 12E2 is supported by the first surface 11a, just like the first magnetic wiring 12L.

[0050] The first tip connection portion 12E2 may extend from the tip of the first magnetic wiring 12L as one unit with the first magnetic wiring 12L, or may be joined to the tip of the first magnetic wiring 12L as a separate body from the first magnetic wiring 12L. The material constituting the first tip connection portion 12E2 may be the same as the material constituting the first magnetic wiring 12L, or may be a conductive material different from the material constituting the first magnetic wiring 12L.

[0051] When it is required to easily manufacture the first thermoelectric conversion unit 12, it is preferable that each of the connecting parts 12E1, 12E2 is integral with the first magnetic wiring 12L, and that the material constituting each of the connecting parts 12E1, 12E2 is the same as the material constituting the first magnetic wiring 12L. When it is required to increase the conductivity of each of the connecting parts 12E1, 12E2, it is preferable that each of the connecting parts 12E1, 12E2 is separate from the first magnetic wiring 12L. And, it is preferable that the material constituting each of the connecting parts 12E1, 12E2 is a metal material different from the material constituting the first magnetic wiring 12L.

[0052] The second base end connection portion 22E1 is conductive. The second base end connection portion 22E1 is connected to the base end of the second magnetic wire 22L in the second direction Dy. The second tip connection portion 22E2 is supported by the second surface 21a, just like the second magnetic wire 22L.

[0053] The second base end connection portion 22E1 may extend from the base end of the second magnetic wiring 22L as one unit with the second magnetic wiring 22L, or may be joined to the base end of the second magnetic wiring 22L as a separate body from the second magnetic wiring 22L. The material constituting the second base end connection portion 22E1 may be the same as the material constituting the second magnetic wiring 22L, or may be a conductive material different from the material constituting the second magnetic wiring 22L.

[0054] The second tip connection portion 22E2 is an example of a second connection portion. The second tip connection portion 22E2 is conductive. The second tip connection portion 22E2 is connected to the tip of the second magnetic wiring 22L in the second direction Dy. The second tip connection portion 22E2 is supported by the second surface 21a, just like the second magnetic wiring 22L.

[0055] The second tip connection portion 22E2 may extend from the tip of the second magnetic wiring 22L as one unit with the second magnetic wiring 22L, or may be joined to the tip of the second magnetic wiring 22L as a separate body from the second magnetic wiring 22L. The material constituting the second tip connection portion 22E2 may be the same as the material constituting the second magnetic wiring 22L, or may be a conductive material different from the material constituting the second magnetic wiring 22L.

[0056] When it is required to easily manufacture the second thermoelectric conversion section 22, it is preferable that each of the connection parts 22E1, 22E2 is integral with the second magnetic wiring 22L, and that the material constituting each of the connection parts 22E1, 22E2 is the same as the material constituting the second magnetic wiring 22L. When it is required to increase the conductivity of each of the connection parts 22E1, 22E2, it is preferable that each of the connection parts 22E1, 22E2 is separate from the second magnetic wiring 22L. And, it is preferable that the material constituting each of the connection parts 22E1, 22E2 is a metal material different from the material constituting the second magnetic wiring 22L.

[0057] The number of each of the connection parts 12E1, 12E2 is equal to the number of the first magnetic wirings 12L. The number of each of the connection parts 22E1, 22E2 is equal to the number of the second magnetic wirings 22L. The number of each of the connection parts 12E1, 12E2, 22E1, 22E2 in one thermoelectric conversion sheet is appropriately selected according to the level of the output voltage and the number of outputs required for the thermoelectric conversion sheet. When it is required to increase the output voltage of the thermoelectric conversion sheet, it is preferable that the number of each of the connection parts 12E1, 12E2, 22E1, 22E2 in one thermoelectric conversion sheet is large, as with the magnetic wirings 12L, 22L.

[0058] [Electrical connection configuration] 2 shows a plan view of each of the magnetic wirings 12L, 22L, and also indicates with arrows the magnetization directions of each of the thermoelectric conversion units 12, 22. For the convenience of easily distinguishing between each of the thermoelectric conversion units 12, 22, the first thermoelectric conversion unit 12 is shown in white, and the second thermoelectric conversion unit 22 is shown with dots.

[0059] 2, the magnetization direction of the first magnetic wiring 12L is a first direction Dx. The magnetization direction of the second magnetic wiring 22L is opposite to the first direction Dx. The thermoelectric conversion sheet includes a plurality of magnetic wirings 12L and 22L arranged such that the magnetization directions are alternately reversed.

[0060] The first base end connection portion 12E1 extends toward the base end of the second magnetic wiring 22L adjacent to the first base end connection portion 12E1. The first tip connection portion 12E2 extends toward the tip of the second magnetic wiring 22L adjacent to the first tip connection portion 12E2. The direction in which the first base end connection portion 12E1 extends from the first magnetic wiring 12L is opposite to the direction in which the first tip connection portion 12E2 extends from the first magnetic wiring 12L.

[0061] The second base end connection portion 22E1 extends toward the base end of the first magnetic wiring 12L adjacent to the second base end connection portion 22E1. The second tip connection portion 22E2 extends toward the tip of the first magnetic wiring 12L adjacent to the second tip connection portion 22E2. The direction in which the second base end connection portion 22E1 extends from the second magnetic wiring 22L is opposite to the direction in which the second tip connection portion 22E2 extends from the second magnetic wiring 22L.

[0062] The extending direction of each of the connection parts 12E1, 12E2 may be, for example, the direction in which the magnetic wirings 12L, 22L are arranged, or may be a direction along the first direction Dx. The extending direction of each of the connection parts 22E1, 22E2 may be, for example, the direction in which the magnetic wirings 12L, 22L are arranged, or may be a direction along the first direction Dx. When it is required to easily manufacture the thermoelectric conversion sheet, it is preferable that the shape of the first thermoelectric conversion part 12 is rotationally symmetrical to the shape of the second thermoelectric conversion part 22 about a rotation axis along the second direction Dy.

[0063] At least one of the first tip connection parts 12E2 is joined to one second tip connection part 22E2 that is closest to the first tip connection part 12E2 among the second tip connection parts 22E2 located in the extending direction of the first tip connection part 12E2. As a result, the tip of the first magnetic wiring 12L is electrically connected to the tip of the second magnetic wiring 22L. The first magnetic wiring 12L and the second magnetic wiring 22L, whose tips are electrically connected to each other, form a same-polarity series circuit. The same-polarity series circuit is a circuit in which each component is connected in series so that the voltages of each component constituting the circuit have the same polarity. The joining of the first tip connection part 12E2 and the second tip connection part 22E2 may be a surface contact between the first tip connection part 12E2 and the second tip connection part 22E2, or may be a joining via a conductive joining material.

[0064] At least one of the first base end connection parts 12E1 may be joined to one second base end connection part 22E1 that is closest to the first base end connection part 12E1 among the second base end connection parts 22E1 located in the extending direction of the first base end connection part 12E1. As a result, the base end of the first magnetic wiring 12L is electrically connected to the base end of the second magnetic wiring 22L. The first magnetic wiring 12L and the second magnetic wiring 22L, whose base ends are electrically connected to each other, form a same-polarity series circuit. The joining between the first base end connection part 12E1 and the second base end connection part 22E1 may be surface contact between the first base end connection part 12E1 and the second base end connection part 22E1, or may be joining via a conductive joining material.

[0065] The length in the second direction Dy of each of the connection parts 12E1, 12E2 is greater than the length in the first direction Dx of the first magnetic wiring 12L. The length in the second direction Dy of each of the connection parts 22E1, 22E2 is greater than the length in the first direction Dx of the second magnetic wiring 22L. The greater the length in the second direction Dy of each of the connection parts 12E1, 12E2, 22E1, 22E2, the more reliable the joint between the connection parts is.

[0066] The first thermoelectric conversion unit 12 and the second thermoelectric conversion unit 22 may include one same-polarity series circuit or multiple same-polarity series circuits. Both ends of the same-polarity series circuit are connected to an external load 31.

[0067] 2 shows an example in which the first thermoelectric conversion unit 12 and the second thermoelectric conversion unit 22 include one same-polarity series circuit. Among all the connections 12E1, 12E2, 22E1, and 22E2, the first base end connection unit 12E1 located furthest in the first direction Dx is one end of the same-polarity series circuit. Among all the connections 12E1, 12E2, 22E1, and 22E2, the second base end connection unit 22E1 located furthest in the opposite direction to the first direction Dx is the other end of the same-polarity series circuit.

[0068] The number of connecting parts 12E1, 12E2, 22E1, 22E2 connected to the external load 31 may be changed as appropriate depending on the number of outputs of the thermoelectric conversion sheet and the level of the output voltage. The number of outputs is the number of output systems in one thermoelectric conversion sheet. When the number of outputs of the thermoelectric conversion sheet is two systems, the thermoelectric conversion sheet outputs voltage from the two systems. In this case, the number of connecting parts 12E1, 12E2, 22E1, 22E2 connected to the external load 31 is at least three.

[0069] 2, the first base end connection portion 12E1 located furthest in the first direction Dx among all the connection portions 12E1, 12E2, 22E1, and 22E2, and the first base end connection portion 12E1 located second furthest in the first direction Dx may be connected to the external load 31. Then, the second base end connection portion 22E1 located furthest in the opposite direction to the first direction Dx among all the connection portions 12E1, 12E2, 22E1, and 22E2 may be connected to the external load 31.

[0070] As a result, one thermoelectric conversion sheet has one same-polarity series circuit in which each of the magnetic wires 12L and 22L has three wires, and also has another same-polarity series circuit in which each of the magnetic wires 12L and 22L has two wires. The thermoelectric conversion sheet has two same-polarity series circuits and also functions as one resistive voltage divider circuit that outputs two voltages.

[0071] Alternatively, one thermoelectric conversion sheet has one same-polarity series circuit with one each of the magnetic wires 12L, 22L, and also has another same-polarity series circuit with two each of the magnetic wires 12L, 22L. The thermoelectric conversion sheet has two same-polarity series circuits and also functions as one resistive voltage divider circuit that outputs two voltages.

[0072] [Layer structure] As described above, the first magnetic wiring 12L is formed on the first surface 11a of the first sheet 11. The first magnetic wiring 12L may be in contact with the second surface 21a of the second sheet 21, or may be separated from the second surface 21a of the second sheet 21 via another layer. One example of the other layer is a resin layer that is filled between the first surface 11a and the second surface 21a and that forms a temperature gradient.

[0073] As described above, the second magnetic wiring 22L is formed on the second surface 21a of the second sheet 21. The second magnetic wiring 22L may be in contact with the first surface 11a of the first sheet 11, or may be separated from the first surface 11a of the first sheet 11 via another layer. One example of the other layer is a resin layer that is filled between the first surface 11a and the second surface 21a and that forms a temperature gradient.

[0074] The adhesion of the first magnetic wiring 12L to the first sheet 11 is higher than that of the first magnetic wiring 12L to the second sheet 21. The adhesion of the second magnetic wiring 22L to the second sheet 21 is higher than that of the second magnetic wiring 22L to the first sheet 11. The more difficult it is for the first magnetic wiring 12L to peel off from the first surface 11a, the higher the adhesion of the first magnetic wiring 12L to the first sheet 11. The more easily the first magnetic wiring 12L is separated from the second surface 21a, the lower the adhesion of the first magnetic wiring 12L to the second sheet 21. The more difficult it is for the second magnetic wiring 22L to peel off from the second surface 21a, the higher the adhesion of the second magnetic wiring 22L to the second sheet 21. The more easily the second magnetic wiring 22L is separated from the first surface 11a, the lower the adhesion of the second magnetic wiring 22L to the first sheet 11.

[0075] The difference in adhesion of the first magnetic wiring 12L to each sheet 11, 21 can be adjusted by the joint configuration between the first magnetic wiring 12L and the first surface 11a, the distance between the first magnetic wiring 12L and the second surface 21a, and the properties of the resin layer filling the gap between the first surface 11a and the second surface 21a. For example, by adopting the first surface 11a that increases the joint strength between the first magnetic wiring 12L and the first surface 11a, the adhesion of the first magnetic wiring 12L to the first sheet 11 increases. For example, by increasing the distance between the first magnetic wiring 12L and the second surface 21a, the adhesion of the first magnetic wiring 12L to the second sheet 21 decreases. For example, by adopting a resin layer that weakens the joint between the first magnetic wiring 12L and the resin layer, the adhesion of the first magnetic wiring 12L to the second sheet 21 decreases.

[0076] Similarly, the difference in adhesion of the second magnetic wiring 22L to each sheet 11, 21 can be adjusted by the joint configuration between the second magnetic wiring 22L and the second surface 21a, the distance between the second magnetic wiring 22L and the second surface 21a, and the properties of other layers filling the space between the first surface 11a and the second surface 21a.

[0077] 3, the first magnetic wiring 12L and the respective connecting portions 12E1, 12E2 are joined to the first surface 11a, and the second magnetic wiring 22L and the respective connecting portions 22E1, 22E2 are joined to the second surface 21a.

[0078] The thickness in the third direction Dz between the first surface 11a and the second surface 21a may be equal to the thickness in the third direction Dz of each of the magnetic wires 12L, 22L, or may be thicker than the thickness in the third direction Dz of each of the magnetic wires 12L, 22L. Fig. 3 shows an example in which the thickness in the third direction Dz between the first surface 11a and the second surface 21a is slightly thicker than the thickness in the third direction Dz of each of the magnetic wires 12L, 22L.

[0079] Each of the connection parts 12E1, 12E2, 22E1, and 22E2 is located between the first surface 11a and the second surface 21a so as to overlap with the connection destination of the connection part. Each of the connection parts 12E1, 12E2, 22E1, and 22E2 is electrically connected by overlapping with the connection destination of the connection part.

[0080] The thicknesses of the connecting parts 12E1, 12E2, 22E1, and 22E2 in the third direction Dz may be equal to each other or different from each other. When it is required to equalize the temperature difference in the third direction Dz between the first surface 11a and the second surface 21a, it is preferable that the thicknesses of the connecting parts 12E1, 12E2, 22E1, and 22E2 in the third direction Dz are thinner than the magnetic wirings 12L and 22L. The thicknesses of the connecting parts 12E1, 12E2, 22E1, and 22E2 in the third direction Dz may be constant or may not be constant.

[0081] For example, in Fig. 3, each of the connecting parts 12E1, 12E2, 22E1, 22E2 gradually becomes thinner from the magnetic wiring 12L, 22L which is the connection source of the connecting part toward the connection destination of the connecting part. The first base end connecting part 12E1 is overlapped with the second base end connecting part 22E1 so that the thinnest part of the second base end connecting part 22E1 is overlapped with the thickest part of the first base end connecting part 12E1. Also, the first tip connecting part 12E2 is overlapped with the second tip connecting part 22E2 so that the thinnest part of the second tip connecting part 22E2 is overlapped with the thickest part of the first tip connecting part 12E2.

[0082] As a result, the total thickness of each of the connection parts 12E1, 22E1 approaches the thickness of each of the magnetic wires 12L, 22L. The total thickness of each of the connection parts 12E2, 22E2 also approaches the thickness of each of the magnetic wires 12L, 22L. And, the temperature difference applied to each of the magnetic wires 12L, 22L is made uniform.

[0083] [Manufacturing method] 4, the manufacturing method of a thermoelectric conversion sheet includes a step of forming a first thermoelectric conversion unit 12 and a second thermoelectric conversion unit 22 on one sheet S1. The sheet S1 has one planned cutting line S1L. The step of forming the first thermoelectric conversion unit 12 and the second thermoelectric conversion unit 22 includes a step of magnetizing each of the magnetic wirings 12L, 22L, and a step of cutting the sheet S1 along the planned cutting line S1L.

[0084] The step of forming the first thermoelectric conversion unit 12 forms a first magnetic wiring 12L, a first base end connection portion 12E1, and a first tip connection portion 12E2 on one side surface S1a of the sheet S1. The step of forming the second thermoelectric conversion unit 22 forms a second magnetic wiring 22L, a second base end connection portion 22E1, and a second tip connection portion 22E2 on one side surface S1a of the sheet S1. A first portion, which is an area where the first thermoelectric conversion unit 12 is formed, is separated from a second portion, which is an area where the second thermoelectric conversion unit 22 is formed, by one planned cutting line S1L.

[0085] Within the range in which the first thermoelectric conversion part 12 is formed, the first magnetic wiring 12L are aligned in the first direction Dx. Between the first magnetic wirings 12L adjacent to each other in the first direction Dx, the second magnetic wiring 22L is not present, and a gap is provided in the first direction Dx of a size that allows the second magnetic wiring 22L to be arranged. The distance between the adjacent first magnetic wirings 12L in the sheet S1 is equal to the distance between the adjacent first magnetic wirings 12L in the thermoelectric conversion sheet.

[0086] Within the range in which the second thermoelectric conversion part 22 is formed, the second magnetic wiring 22L are aligned in the first direction Dx. Between adjacent second magnetic wirings 22L in the first direction Dx, the first magnetic wiring 12L is not present, and a gap is provided in the first direction Dx of a size in which the first magnetic wiring 12L can be arranged. The interval between adjacent second magnetic wirings 22L in the sheet S1 is equal to the interval between adjacent second magnetic wirings 22L in the thermoelectric conversion sheet.

[0087] The method for forming each of the magnetic wirings 12L, 22L may be a vapor phase film formation method using the sheet S1 as a substrate, or a liquid phase film formation method using the sheet S1 as a substrate. An example of a vapor phase film formation method is a deposition method or a sputtering method. An example of a liquid phase film formation method is a printing method using an ink in which a magnetic material is dispersed in a binder resin. Examples of printing methods are a lithographic printing method, a letterpress printing method, an intaglio printing method, a screen printing method, and an inkjet method. When an improvement in the productivity of the thermoelectric conversion sheet is required, it is preferable to use a roll-to-roll format in which the sheet S1 is in the form of a roll.

[0088] In the sheet S1, the first magnetic wiring 12L is magnetized so that the magnetization direction is the first direction Dx. In the sheet S1, the direction in which the first base end connection portion 12E1 extends from the base end of the first magnetic wiring 12L is, for example, the first direction Dx. In the sheet S1, the direction in which the second base end connection portion 22E1 extends from the base end of the second magnetic wiring 22L is also, for example, the first direction Dx.

[0089] In the sheet S1, the second magnetic wiring 22L is magnetized so that the magnetization direction is the first direction Dx. In the sheet S1, the direction in which the first tip connection part 12E2 extends from the tip of the first magnetic wiring 12L is opposite to the first direction Dx. In the sheet S1, the direction in which the second tip connection part 22E2 extends from the tip of the second magnetic wiring 22L is also opposite to the first direction Dx.

[0090] That is, all the magnetic wirings 12L, 22L formed on the side surface S1a are magnetized so that the magnetization direction is the first direction Dx. According to such a magnetization process, the magnetization direction of all the magnetic wirings 12L, 22L formed on the sheet S1 is made common, so that the load required for the magnetization process is reduced. Note that each of the connection parts 12E1, 12E2, 22E1, 22E2 may or may not be magnetized together with the magnetic wirings 12L, 22L. When further reduction in the load required for the magnetization process is required, it is preferable that the connection parts 12E1, 12E2, 22E1, 22E2 are magnetized together with the magnetic wirings 12L, 22L.

[0091] 5, the sheet S1 is cut along the planned cutting line S1L. By cutting the sheet S1 along the planned cutting line S1L, a first sheet 11 and a second sheet 21 are formed.

[0092] The first sheet 11 is overlapped on the second sheet 21 so that one second magnetic wiring 22L is located between the mutually adjacent first magnetic wirings 12L. The first sheet 11 is overlapped on the second sheet 21 so that the first base end connection portion 12E1 overlaps the second base end connection portion 22E1 and the first tip connection portion 12E2 overlaps the second tip connection portion 22E2. At this time, the direction in which the first base end connection portion 12E1 extends from the base end of the first magnetic wiring 12L is opposite to the direction in which the second base end connection portion 22E1 extends from the base end of the second magnetic wiring 22L. The direction in which the first tip connection portion 12E2 extends from the tip of the first magnetic wiring 12L is opposite to the direction in which the second tip connection portion 22E2 extends from the tip of the second magnetic wiring 22L. As a result, the first magnetic wire 12L is electrically connected to the second magnetic wire 22L so as to form a same-polarity series circuit between the first surface 11a and the second surface 21a.

[0093] When the second sheet 21 is superposed on the first sheet 11, a conductive material may be interposed between the first tip connection portion 12E2 and the second tip connection portion 22E2. When the second sheet 21 is superposed on the first sheet 11, a resin layer may be interposed between the first magnetic wiring 12L and the second surface 21a and between the second magnetic wiring 22L and the first surface 11a. The first surface 11a may be bonded to the second surface 21a via an adhesive, a bonding agent, or a thermoplastic resin.

[0094] According to the above embodiment, the following effects can be obtained. (1) Between the first sheet 11 and the second sheet 21, the first magnetic wiring 12L is connected to the second magnetic wiring 22L so that the first magnetic wiring 12L and the second magnetic wiring 22L form a same-polarity series circuit. This increases the output voltage per volume in the thermoelectric conversion sheet. As a result, the output voltage of the thermoelectric conversion sheet increases whether the thermoelectric conversion sheet has a roll-like structure or a flat structure.

[0095] (2) Each of the magnetic wires 12L, 22L has high adhesion to the other sheets 11, 21, and low adhesion to the other sheets 11, 21. This makes it possible to employ a manufacturing method in which each of the magnetic wires 12L, 22L is formed on a separate sheet. As a result, it is easy to give opposite magnetization directions to the two magnetic wires 12L, 22L that are parallel to each other.

[0096] (3) The first surface 11a on which the first magnetic wiring 12L is formed is different from the second surface 21a on which the second magnetic wiring 22L is formed. This allows the magnetization process for forming each of the magnetic wirings 12L and 22L to be common, while also allowing the magnetization direction of the first magnetic wiring 12L and the magnetization direction of the second magnetic wiring 22L to be made opposite to each other by rotating the second surface 21a relative to the first surface 11a. As a result, it is easy to give opposite magnetization directions to the magnetic wirings 12L and 22L that are parallel to each other.

[0097] (4) The first tip connection portion 12E2 extends from the tip of the first magnetic wiring 12L toward the tip of the second magnetic wiring 22L. This makes it easy to connect the second magnetic wiring 22L to the first magnetic wiring 12L. Similarly, the first base end connection portion 12E1 extends from the base end of the first magnetic wiring 12L toward the base end of the second magnetic wiring 22L. This makes it easy to connect the second magnetic wiring 22L to the first magnetic wiring 12L.

[0098] (5) The second tip connection portion 22E2 extends from the tip of the second magnetic wiring 22L toward the tip of the first magnetic wiring 12L. This makes it easy to connect the first magnetic wiring 12L to the second magnetic wiring 22L. Similarly, the second base end connection portion 22E1 extends from the base end of the second magnetic wiring 22L toward the base end of the first magnetic wiring 12L. This makes it easy to connect the second magnetic wiring 22L to the first magnetic wiring 12L.

[0099] (6) The length of each of the connecting parts 12E1, 12E2, 22E1, and 22E2 in the second direction Dy may be greater than the length of the magnetic wirings 12L and 22L in the first direction Dx. In this case, the first magnetic wiring 12L is more easily electrically connected to the second magnetic wiring 22L than in a configuration in which the first magnetic wiring 12L is simply bent toward the second magnetic wiring 22L. This also increases the reliability of the electrical connection between the connecting parts.

[0100] (7) The thickness of each of the connection parts 12E1, 12E2, 22E1, 22E2 may be thinner than the thickness of the magnetic wires 12L, 22L. In this case, in a configuration in which the connection parts are overlapped, the distance between the first surface 11a and the second surface 21a is prevented from becoming wider than the thickness of the magnetic wires 12L, 22L. Therefore, the temperature difference between the first surface 11a and the second surface 21a is easily transmitted to the magnetic wires 12L, 22L.

[0101] [Example of change] The above embodiment can be modified as follows. [Connection Plan Shape] 6, the shape of each of the connection parts 12E1, 12E2, 22E1, and 22E2 may be disk-shaped. In this case, when it is required to improve the reliability of the electrical connection between the joint parts, as described above, it is preferable that the diameter of each of the connection parts 12E1, 12E2, 22E1, and 22E2 is larger than the length of the magnetic wirings 12L and 22L in the first direction Dx.

[0102] As shown in FIG. 7, each of the connection parts 12E1, 12E2, 22E1, and 22E2 may be composed of two connection elements. That is, each of the connection parts 12E1, 12E2, 22E1, and 22E2 may be composed of two or more structures arranged in the second direction Dy. In this case, as shown by the two-dot chain line in FIG. 7, a connection element connected to the first magnetic wiring 12L and a connection element connected to the second magnetic wiring 22L may be arranged so as to overlap between the connection elements. This allows the second magnetic wiring 22L to be shifted relative to the first magnetic wiring 12L in the second direction Dy, and also makes it possible to obtain reliability of the electrical connection between the joint parts.

[0103] As shown in FIG. 8, each of the connection parts 12E1, 12E2 may be separated from the first magnetic wiring 12L. Also, each of the connection parts 22E1, 22E2 may be separated from the second magnetic wiring 22L. In this case, as shown by the two-dot chain line in FIG. 8, the second tip connection part 22E2 is arranged so as to overlap with the first magnetic wiring 12L and the first tip connection part 12E2. Also, the first tip connection part 12E2 is arranged so as to overlap with the second magnetic wiring 22L and the second tip connection part 22E2. Even with such a configuration, it is possible to electrically connect the first magnetic wiring 12L and the second magnetic wiring 22L.

[0104] [Connection cross-sectional shape] 9, the thickness of each of the connection parts 12E1, 12E2 may be equal to the thickness of the first magnetic wiring 12L. Also, the thickness of each of the connection parts 22E1, 22E2 may be equal to the thickness of the second magnetic wiring 22L. With this configuration, a process for making each of the connection parts 12E1, 12E2 thinner than the first magnetic wiring 12L is not required. Also, a process for making each of the connection parts 22E1, 22E2 thinner than the second magnetic wiring 22L is not required.

[0105] This simplifies the manufacturing process of the thermoelectric conversion sheet. If the material constituting each of the connection parts 12E1, 12E2 is the same as the material constituting the first magnetic wiring 12L, the manufacturing process of the first thermoelectric conversion part 12 is further simplified. If the material constituting each of the connection parts 22E1, 22E2 is the same as the material constituting the second magnetic wiring 22L, the manufacturing process of the second thermoelectric conversion part 22 is further simplified.

[0106] 10, each of the connection parts 12E1, 12E2 may have a portion having the same thickness as the first magnetic wiring 12L and a portion having a thickness thinner than the first magnetic wiring 12L. Also, each of the connection parts 22E1, 22E2 may have a portion having the same thickness as the second magnetic wiring 22L and a portion having a thickness thinner than the second magnetic wiring 22L. Then, the relatively thick portions of each of the connection parts 12E1, 12E2 are overlapped with the relatively thin portions of each of the connection parts 22E1, 22E2. Also, the relatively thin portions of each of the connection parts 12E1, 12E2 are overlapped with the relatively thick portions of each of the connection parts 22E1, 22E2.

[0107] This configuration increases the area of ​​contact between the connection parts and makes it easier to identify the positions at which the connection parts are joined, thereby further improving the reliability of the electrical connection between the joint parts.

[0108] As shown in FIG. 11, the thickness of each of the connection parts 12E1, 12E2 may be a constant value that is half the thickness of the first magnetic wiring 12L. The thickness of each of the connection parts 22E1, 22E2 may be a constant value that is half the thickness of the second magnetic wiring 22L. In this way, the thickness of the two joint parts joined to each other is equal to the thickness of each of the magnetic wirings 12L, 22L. And the distance between the first surface 11a and the second surface 21a is equal to the thickness of each of the magnetic wirings 12L, 22L, which is the minimum value. As a result, the temperature difference between the first surface 11a and the second surface 21a is effectively transmitted to each of the magnetic wirings 12L, 22L.

[0109] Sheet 12, the first sheet 11 may include a substrate and a first intermediate layer 15 constituting the first surface 11a. The first intermediate layer 15 is a layer located between the plurality of first magnetic wirings 12L and the substrate.

[0110] The first intermediate layer 15 may have a higher thermal conductivity than the substrate, thereby suppressing the temperature difference between one first magnetic wiring 12L and another first magnetic wiring 12L. The first intermediate layer 15 may have high adhesion to the first magnetic wiring 12L. That is, the adhesion of the first magnetic wiring 12L to the first intermediate layer 15 may be higher than the adhesion of the first magnetic wiring 12L to the substrate. The first intermediate layer 15 may promote magnetization of the first magnetic wiring 12L. For example, the first intermediate layer 15 may promote the orientation suitable for magnetization in the material constituting the first magnetic wiring 12L. With such a configuration including the first intermediate layer 15, the first sheet 11 can easily fulfill various functions required of the first sheet 11.

[0111] The second sheet 21 may also include a substrate and a second intermediate layer 25 constituting the second surface 21a. The second intermediate layer 25 is a layer located between the multiple second magnetic wirings 22L and the substrate.

[0112] The second intermediate layer 25 may have a higher thermal conductivity than the substrate, thereby suppressing the temperature difference between one second magnetic wiring 22L and the other second magnetic wiring 22L. The second intermediate layer 25 may have high adhesion to the second magnetic wiring 22L. That is, the adhesion of the second magnetic wiring 22L to the second intermediate layer 25 may be higher than the adhesion of the second magnetic wiring 22L to the substrate. The second intermediate layer 25 may promote magnetization of the second magnetic wiring 22L. For example, the second intermediate layer 25 may promote the orientation suitable for magnetization in the material constituting the second magnetic wiring 22L. With such a configuration including the second intermediate layer 25, the second sheet 21 can easily fulfill various functions required for the second sheet 21.

[0113] 13, the first intermediate layer 15 may be provided for each of the first magnetic wirings 12L, and the second intermediate layer 25 may be provided for each of the second magnetic wirings 22L. [Manufacturing method] 14, in the step of forming the first thermoelectric conversion section 12, the first thermoelectric conversion section 12 may be formed on one first sheet 11. In addition, in the step of forming the second thermoelectric conversion section 22, the second thermoelectric conversion section 22 may be formed on one second sheet 21. That is, the sheet for forming the first thermoelectric conversion section 12 may be a separate member from the sheet for forming the second thermoelectric conversion section 22. This makes it easy to perform separate magnetization processes for the magnetization direction of the first magnetic wiring 12L to be the first direction Dx and the magnetization direction of the second magnetic wiring 22L to be the opposite direction to the first direction Dx.

[0114] At this time, the second sheet 21 is applied to the first sheet 11 so that the second base end connecting portion 22E1 is superimposed on the first base end connecting portion 12E1, as indicated by the arrows in Fig. 14. Even with this manufacturing method, a thermoelectric conversion sheet having the above-mentioned configuration can be manufactured.

[0115] 15, one thermoelectric conversion sheet may include a plurality of same-polarity series circuits arranged in a matrix. The same-polarity series circuits arranged two-dimensionally along the surface direction of the first surface 11a can detect heat flow in the in-plane direction of the first surface 11a in addition to the thickness direction of the thermoelectric conversion sheet. This makes it possible to detect heat flow in the first direction Dx, the second direction Dy, and the third direction Dz.

[0116] [Note] The technical ideas derived from the above-described embodiment and modified examples are described below. [Appendix 1] a first magnetic wiring that is magnetized in a first direction and extends in a second direction perpendicular to the first direction; a second magnetic wiring that is magnetized in a direction opposite to the first direction and extends in the second direction; a first sheet joined to the first magnetic wiring; A second sheet joined to the second magnetic wiring, the first magnetic wiring is located between the first sheet and the second sheet and is spaced apart from the second sheet; the second magnetic wiring is located between the first sheet and the second sheet and is spaced apart from the first sheet; The first magnetic wiring and the second magnetic wiring are aligned in the first direction, A thermoelectric conversion sheet, wherein the first magnetic wiring and the second magnetic wiring are connected such that a tip end of the first magnetic wiring in the second direction is connected to a base end of the second magnetic wiring in the second direction.

[0117] [Appendix 2] forming a first magnetic wiring on a first surface, the first magnetic wiring being magnetized in a first direction and extending in a second direction perpendicular to the first direction; forming a second magnetic wiring on a second surface, the second magnetic wiring being magnetized so that the magnetization direction is parallel to the first direction and extending in the second direction; a first surface facing the second surface such that a magnetization direction of the first magnetic wiring is opposite to a magnetization direction of the second magnetic wiring, and the first magnetic wiring and the second magnetic wiring are arranged in the first direction between the first surface and the second surface, the first magnetic wiring is spaced from the second surface and the second magnetic wiring is spaced from the first surface, and an end of the second magnetic wiring in the second direction is electrically connected to an end of the first magnetic wiring in the second direction.

[0118] According to the configurations described in Supplementary Notes 1 and 2 above, two mutually parallel magnetic wirings are disposed between the first sheet and the second sheet. One of the two magnetic wirings is connected to the other magnetic wiring so as to form a same-polarity series circuit. This increases the output voltage per volume in the thermoelectric conversion sheet compared to a single magnetic layer having a volume equivalent to two magnetic wirings. As a result, the output voltage of the thermoelectric conversion sheet is increased whether the structure of the thermoelectric conversion sheet is a roll or a flat structure.

[0119] Moreover, each magnetic wiring is joined to a different sheet and separated from the different sheet. This makes it possible to adopt a manufacturing method in which each magnetic wiring is formed on a different sheet. That is, it is possible to adopt a manufacturing method in which a second sheet is overlaid on a first sheet so that the surface on which the first magnetic wiring is formed faces the surface on which the second magnetic wiring is formed. With this manufacturing method, it is easy to give opposing magnetization directions to two magnetic wirings that are parallel to each other. [Explanation of symbols]

[0120] Dx…first direction Dy…Second direction Dz…Third direction 11…1st sheet 11a…First page 12...First magnetic wiring 12E1…First base end connection part 12E2…Second end connection part 21…Second seat 21a…Second side 22…Second magnetic wiring 22E1...First base end connection part 22E2…Second end connection part

Claims

1. a first magnetic wiring that is magnetized in a first direction and extends in a second direction perpendicular to the first direction; a second magnetic wiring that is magnetized in a direction opposite to the first direction and extends in the second direction; A first sheet supporting the first magnetic wiring; A second sheet supporting the second magnetic wiring, The first magnetic wiring and the second magnetic wiring are located between the first sheet and the second sheet and are aligned in the first direction, a tip of the first magnetic wiring in the second direction is electrically connected to a tip of the second magnetic wiring in the second direction, the adhesion of the first magnetic wiring to the first sheet is higher than the adhesion of the first magnetic wiring to the second sheet; the adhesion of the second magnetic wiring to the second sheet is higher than the adhesion of the second magnetic wiring to the first sheet; The first sheet further includes a first connection portion extending from a tip of the first magnetic wiring in the second direction toward a tip of the second magnetic wiring in the second direction, a tip end of the first magnetic wiring in the second direction is electrically connected to a tip end of the second magnetic wiring in the second direction via the first connection portion, The second sheet further includes a second connection portion extending from a tip of the second magnetic wiring in the second direction toward the first connection portion, The first connection portion is connected to the second connection portion, a length of the first connection portion in the second direction is greater than a length of the first magnetic wiring in the first direction, The first connection portion is overlapped with the second connection portion, whereby the first magnetic wiring is electrically connected to the second magnetic wiring, The thickness of the first connection portion is smaller than the thickness of the first magnetic wiring. Thermoelectric conversion sheet.

2. A first magnetic wiring magnetized in a first direction and extending in a second direction perpendicular to the first direction; a second magnetic wiring that is magnetized in a direction opposite to the first direction and extends in the second direction; A first sheet supporting the first magnetic wiring; A second sheet supporting the second magnetic wiring, The first magnetic wiring and the second magnetic wiring are located between the first sheet and the second sheet and are aligned in the first direction, a tip of the first magnetic wiring in the second direction is electrically connected to a tip of the second magnetic wiring in the second direction, the adhesion of the first magnetic wiring to the first sheet is higher than the adhesion of the first magnetic wiring to the second sheet; the adhesion of the second magnetic wiring to the second sheet is higher than the adhesion of the second magnetic wiring to the first sheet; The first sheet further includes a first connection portion extending from a tip of the first magnetic wiring in the second direction toward a tip of the second magnetic wiring in the second direction, a tip end of the first magnetic wiring in the second direction is electrically connected to a tip end of the second magnetic wiring in the second direction via the first connection portion, The second sheet further includes a second connection portion extending from a tip of the second magnetic wiring in the second direction toward the first connection portion, the first connection portion is spaced apart from a tip of the first magnetic wiring in the second direction, the second connection portion is spaced apart from a tip of the second magnetic wiring in the second direction, the first connection portion connects the second connection portion to a tip of the second magnetic wiring in the second direction, the second connection portion connects the first connection portion to a tip end of the first magnetic wiring in the second direction; Thermoelectric conversion sheet.

3. The shape of the second magnetic wiring is rotationally symmetrical to the shape of the first magnetic wiring with respect to a rotation axis extending in the second direction. The thermoelectric conversion sheet according to claim 1 or 2.

4. forming a first magnetic wiring on a first surface, the first magnetic wiring being magnetized in a first direction and extending in a second direction perpendicular to the first direction; forming a second magnetic wiring on a second surface, the second magnetic wiring being magnetized so that the magnetization direction is parallel to the first direction and extending in the second direction; the second surface faces the first surface such that a magnetization direction of the first magnetic wiring is opposite to a magnetization direction of the second magnetic wiring, the first magnetic wiring and the second magnetic wiring are arranged in the first direction between the first surface and the second surface, and an end of the first magnetic wiring in the second direction is electrically connected to an end of the second magnetic wiring in the second direction, forming the first magnetic wiring means forming the first magnetic wiring on a sheet having the first surface; forming the second magnetic wiring means forming the first magnetic wiring on the sheet having the second surface; The step of facing the first surface and the second surface includes separating a second portion of the sheet having the second surface from a first portion of the sheet having the first surface, and facing the second surface of the second portion to the first surface of the first portion. A method for manufacturing a thermoelectric conversion sheet.

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