Pseudo-sheet structure, sheet-like conductive member, and sensor device

Abstract

A quasi-sheet structure (20) used in a sensor that oscillates electromagnetic waves in a frequency band of 20 GHz or more and 100 GHz or less, the quasi-sheet structure (20) being composed of a plurality of electrically conductive linear bodies (22) arranged at intervals, the intervals L of the plurality of electrically conductive linear bodies (22) satisfying the following formula (1), 0.034 x λ S ≤ L ≤ 20 mm … (1), in which formula (1), L is the intervals of the plurality of electrically conductive linear bodies (22), λ S is the wavelength of the electromagnetic waves oscillated from the sensor, and L and λ S are in mm.

Description

TECHNICAL FIELD

[0001] The present application relates to a pseudo-sheet structure, a sheet-shaped conductive member, and a sensor device. BACKGROUND

[0002] Currently, in a millimeter wave radar, an AIDAS (Attention Interest Desire Action Satisfaction), or a road sign, for example, a laser having a frequency of 76 GHz (3.9 mm) or 79 ± 4 GHz (3.6 mm ~ 3.8 mm ~ 4.0 mm) is used if it is a millimeter wave. Also, for a LiDAR (Light Detection and Ranging), a laser having a wavelength of 950 nm using silicon or a communication laser having a wavelength of 1550 nm using gallium arsenide is used.

[0003] Therefore, the wavelength of the radar used is 900 nm ~ 1600 nm as in the LiDAR or 3.5 mm ~ 4.4 mm as in the millimeter wave radar.

[0004] Generally, such a radar identifies an electromagnetic wave that is reflected and returned from a polarized wave emitted or oscillated by the radar itself to obtain position information. Therefore, when an object that reflects or absorbs a polarized wave emitted or oscillated by the radar is provided on the surface of each radar, it is difficult to obtain accurate position information. In a vehicle in which a radar is provided under a vehicle badge, attenuation is avoided by causing a crack in a metal foil film used for the vehicle badge or the like. Also, in order to suppress attenuation caused by snow on the vehicle badge, there is a case where a heater is used, but in a heater using ITO (Indium Tin Oxide), attenuation is large, and thus the heater cannot be used.

[0005] For example, Patent Literature 1 describes a transparent heating body facing a sensor arrangement. The transparent heating body has a plurality of connection conductors connecting a pair of bus bars. In Patent Literature 1, a scheme is described in which the resistance value of the heating conductor is appropriately controlled by limiting the arrangement direction of the connection conductors and the number of turns of the connection conductors.

[0006] PRIOR ART DOCUMENTS

[0007] PATENT LITERATURE

[0008] Patent Literature 1: Japanese Patent Application Publication No. 2019-96617 SUMMARY

[0009] PROBLEMS TO BE SOLVED BY THE INVENTION

[0010] As described above, for the heater mounted in the sensor, not only the heating function but also the excellent electromagnetic wave transmittance is required, and the detailed conditions for obtaining the heater having both the excellent electromagnetic wave transmittance and the heater function are not described in Patent Literature 1.

[0011] An object of the present application is to provide a pseudo sheet structure which efficiently transmits electromagnetic waves and has a heater function. Another object of the present application is to provide a sheet-shaped conductive member provided with the pseudo sheet structure. Another object of the present application is to provide a sensor device provided with the pseudo sheet structure or the sheet-shaped conductive member.

[0012] Technical solution for solving the technical problem

[0013] According to one aspect of the present application, there is provided a pseudo sheet structure to be used in a sensor which oscillates electromagnetic waves in a frequency band of 20 GHz or more and 100 GHz or less, characterized by comprising:

[0014] the pseudo sheet structure is composed of a plurality of electrically conductive linear bodies arranged at intervals,

[0015] the intervals L of the plurality of electrically conductive linear bodies satisfy the following formula (1),

[0016] 0.034 x λ S ≤ L ≤ 20 mm … (1),

[0017] in the formula (1), λ S is a wavelength of the electromagnetic waves oscillated from the sensor, and L and λ S have mm as the unit.

[0018] In the pseudo sheet structure according to one aspect of the present application, it is preferable that the intervals L of the plurality of electrically conductive linear bodies satisfy the following formula (2),

[0019] 0.034 x λ S ≤ L ≤ 0.86 x λ S … (2),

[0020] in the formula (2), λ S is a wavelength of the electromagnetic waves oscillated from the sensor, and L and λ S have mm as the unit.

[0021] In the pseudo sheet structure according to one aspect of the present application, it is preferable that the width D of the electrically conductive linear bodies when the pseudo sheet structure is viewed from the top satisfies the following formula (3),

[0022] D ≤ 0.013 x λ S … (3),

[0023] in the formula (3), λ SD is a wavelength of an electromagnetic wave oscillated from the sensor, and λ S The unit of D is mm.

[0024] In the pseudo-sheet structure according to one embodiment of the present application, it is preferable that the electromagnetic wave oscillated from the sensor be a linearly polarized wave, and the electrically conductive linear member be arranged so that the length direction of the electrically conductive linear member is inclined with respect to the polarization plane of the linearly polarized wave in a range of 70° or more and 110° or less.

[0025] In the pseudo-sheet structure according to one embodiment of the present application, it is preferable that the pseudo-sheet structure be used as an electromagnetic wave filter that suppresses transmission of an electromagnetic wave oscillated from an oscillation source different from the sensor, and be used as a heating element.

[0026] According to one embodiment of the present application, there is provided a sheet-like conductive member including the pseudo-sheet structure according to one embodiment of the present application and a base material that supports the pseudo-sheet structure.

[0027] In the sheet-like conductive member according to one embodiment of the present application, it is preferable that the pseudo-sheet structure be fixed to the base material by a resin layer.

[0028] In the sheet-like conductive member according to one embodiment of the present application, it is preferable that the resin layer contain a cured product of a curable resin.

[0029] According to one embodiment of the present application, there is provided a sensor device including the pseudo-sheet structure according to one embodiment of the present application and a sensor that oscillates an electromagnetic wave in a frequency band of 20 GHz or more and 100 GHz or less.

[0030] According to one embodiment of the present application, there is provided a sensor device including the sheet-like conductive member according to one embodiment of the present application and a sensor that oscillates an electromagnetic wave in a frequency band of 20 GHz or more and 100 GHz or less.

[0031] According to one embodiment of the present application, it is possible to provide a pseudo-sheet structure that efficiently transmits an electromagnetic wave and has a heater function. Furthermore, according to one embodiment of the present application, it is possible to provide a sheet-like conductive member including the pseudo-sheet structure. Furthermore, according to one embodiment of the present application, it is possible to provide a sensor device including the pseudo-sheet structure or the sheet-like conductive member. BRIEF DESCRIPTION OF DRAWINGS

[0032] Figure 1 is a schematic cross-sectional view of a sheet-like conductive member including a pseudo-sheet structure according to one embodiment.

[0033] Figure 2 is a schematic plan view of a sheet-like conductive member including a pseudo-sheet structure according to one embodiment.

[0034] Figure 3This is a simplified top view of a heating device with a sheet-like structure and electrodes, according to one embodiment.

[0035] Figure 4 This is a simplified cross-sectional view of a sensor device having one embodiment of a sheet-like structure and a sensor.

[0036] Figure 5 It is a simplified three-dimensional diagram used to illustrate the configuration of the longitudinal direction of a conductive linear body and the polarization surface of a linearly polarized wave.

[0037] Figure 6 It is a graph showing the relationship between the angle of the length direction of a conductive linear body relative to the polarization surface and the electromagnetic wave transmittance. Detailed Implementation

[0038] The present invention will now be described with reference to the accompanying drawings, using examples of specific embodiments. The present invention is not limited to the embodiments described herein. It should be noted that some portions of the drawings are enlarged or reduced for ease of explanation.

[0039] [First Implementation Method]

[0040] (Sheet-shaped conductive component)

[0041] Figure 1 The diagram shows a simplified cross-sectional view of the sheet-like conductive component 1, which includes the sheet-like structure 20 of this embodiment.

[0042] Figure 2 The diagram shows a simplified top view of the sheet-like conductive component 1, which includes the sheet-like structure 20 of this embodiment.

[0043] The sheet-like conductive component 1 of this embodiment includes a pseudo-sheet structure 20 and a substrate 10 supporting the pseudo-sheet structure 20 (see reference). Figure 1 and Figure 2 The sheet-like structure 20 is fixed to the substrate 10 by the resin layer 30 (see reference). Figure 1 and Figure 2 ).

[0044] (Simulated sheet structure)

[0045] In this invention, the pseudo-sheet structure 20 refers to a sheet-like structure in which a plurality of conductive linear bodies 22 are arranged at intervals.

[0046] The pseudo-sheet structure 20 of this embodiment is used in sensors that oscillate electromagnetic waves in the frequency band of 20 GHz or higher and 100 GHz or lower.

[0047] The pseudo-sheet structure 20 includes a plurality of electrically conductive linear bodies 22. In the pseudo-sheet structure 20, the plurality of electrically conductive linear bodies 22 are arranged with intervals from each other. That is, the pseudo-sheet structure 20 is constituted by the plurality of electrically conductive linear bodies 22 arranged with intervals. It is preferable that the plurality of electrically conductive linear bodies 22 respectively extend in one direction. It is preferable that the plurality of electrically conductive linear bodies 22 are arranged in parallel with each other.

[0048] In the pseudo-sheet structure 20 of the present embodiment, the interval L of the plurality of electrically conductive linear bodies 22 satisfies the following formula (1).

[0049] 0.034 x λ S ≤ L ≤ 20 mm … (1)

[0050] In the formula (1), L is the interval of the plurality of electrically conductive linear bodies 22, λ S is the wavelength of an electromagnetic wave oscillated from a sensor using the pseudo-sheet structure 20, and the units of L and λ S are mm.

[0051] Note that the wavelength λ [m] with respect to the frequency f [Hz] can be found by the following formula.

[0052] λ = c / f

[0053] c is the velocity (phase velocity) of propagation of an electromagnetic wave, and is equal to the speed of light.

[0054] In the pseudo-sheet structure 20 of the present embodiment, the interval L of the plurality of electrically conductive linear bodies 22 satisfies the relation of "0.034 x λ S ≤ L" in the formula (1), and thus the pseudo-sheet structure 20 can efficiently transmit an electromagnetic wave oscillated from a sensor. Further, the interval L of the plurality of electrically conductive linear bodies 22 satisfies the relation of "L ≤ 20 mm" in the formula (1), and thus the interval L of the electrically conductive linear bodies 22 from each other does not become excessively large. Therefore, the pseudo-sheet structure 20 as a heat generating body can maintain a low resistance and function as a heater in which the distribution of temperature rise is uniform.

[0055] In the pseudo-sheet structure 20 of the present embodiment, it is preferable that the interval L of the plurality of electrically conductive linear bodies 22 satisfies the following formula (2).

[0056] 0.034 x λ S ≤ L ≤ 0.86 x λ S … (2)

[0057] In the formula (2), L is the interval of the plurality of electrically conductive linear bodies 22, λ S is the wavelength of an electromagnetic wave oscillated from a sensor using the pseudo-sheet structure 20, and the units of L and λ S are mm.

[0058] In the pseudo-sheet structure 20 of the present embodiment, in a case where the interval L of the plurality of electrically conductive linear bodies 22 satisfies the formula (2), the pseudo-sheet structure 20 is capable of more efficiently reflecting electromagnetic waves oscillated from other sensors. Also, the heater function of the pseudo-sheet structure 20 is improved.

[0059] The interval L of the electrically conductive linear bodies 22 is preferably 20 mm or less. If the interval L of the electrically conductive linear bodies 22 is 20 mm or less, the variation in the in-plane heating of the pseudo-sheet structure 20 can be suppressed.

[0060] The interval L of the plurality of electrically conductive linear bodies 22 is the interval of the electrically conductive linear bodies 22 from each other. Note that the interval of the two adjacent electrically conductive linear bodies 22 is the length in which the electrically conductive linear bodies 22 are aligned in the same direction and is the length between the opposing portions of the two electrically conductive linear bodies 22 (see FIG. 2). Figure 1 ).

[0061] In a case where the electrically conductive linear bodies 22 are arranged in a non-constant interval, the interval L is the average of the intervals of all the adjacent electrically conductive linear bodies 22 from each other. From the viewpoint of easily controlling the value of the interval L, and the like, it is preferable that the electrically conductive linear bodies 22 be arranged in a substantially constant interval in the pseudo-sheet structure 20, and more preferably in a constant interval.

[0062] Regarding the interval L of the electrically conductive linear bodies 22, the interval of the two adjacent electrically conductive linear bodies 22 is measured by observing the electrically conductive linear bodies 22 of the pseudo-sheet structure 20 using a digital microscope.

[0063] The cross-sectional shape of the electrically conductive linear bodies 22 is not particularly limited. As the cross-sectional shape of the electrically conductive linear bodies 22, a polygonal shape, a flat shape, an elliptical shape, a circular shape, a film shape, and the like can be given. The pseudo-sheet structure 20 of the present embodiment has a plurality of electrically conductive linear bodies 22 whose cross sections are substantially circular, but the present application is not limited to the cross-sectional shape of the electrically conductive linear bodies 22 in the present embodiment. From the viewpoint of the compatibility with the resin included in the resin layer 30 that fixes the pseudo-sheet structure 20 to the substrate 10, and the like, it is preferable that the cross-sectional shape of the electrically conductive linear bodies 22 be an elliptical shape or a circular shape.

[0064] The width D of the electrically conductive linear bodies 22 when the pseudo-sheet structure 20 is viewed from above preferably satisfies the following formula (3).

[0065] D ≤ 0.013 x λ S …(3)

[0066] In the formula (3), D is the width of the electrically conductive linear bodies 22, and λ S is the wavelength of the electromagnetic waves oscillated from the sensor in which the pseudo-sheet structure 20 is used, and D and λS The unit is mm.

[0067] In the pseudo-sheet structure 20 of the present embodiment, the width D of the conductive linear member 22 satisfies the formula (3), and thus the electromagnetic wave oscillating from the sensor can be suppressed from being reflected by the pseudo-sheet structure 20.

[0068] It is preferable that the conductive linear member 22 be linear or wave-shaped in a plan view of the pseudo-sheet structure 20. As the wave-shaped form in the conductive linear member 22, for example, a sine wave, a rectangular wave, a triangular wave, or a sawtooth wave, or the like can be given. If the pseudo-sheet structure 20 is configured as described above, the conductive linear member 22 can be suppressed from being cut when the sheet-shaped conductive member 1 is stretched in the axial direction of the conductive linear member 22.

[0069] Note that even if the sheet-shaped conductive member 1 is stretched in a direction orthogonal to the axial direction of the conductive linear member 22, the conductive linear member 22 is difficult to be cut. Thus, the sheet-shaped conductive member 1 has sufficient stretchability.

[0070] In the pseudo-sheet structure 20, the number of the conductive linear members 22 is not particularly limited as long as a plurality of the conductive linear members 22 are arranged. It is preferable that the pseudo-sheet structure 20 have a number of the conductive linear members 22 set from the viewpoint of exhibiting a heater function, for example.

[0071] In the pseudo-sheet structure 20, it is preferable that the conductive linear members 22 be arranged at equal intervals in a direction orthogonal to the axial direction of the conductive linear member 22.

[0072] In the case where the cross section of the conductive linear member 22 is circular, the diameter of the conductive linear member 22 corresponds to the width D of the conductive linear member 22 shown in FIGS. 1 and 2. Figure 1 and Figure 2 It is preferable that the diameter (width D) of the conductive linear member 22 be 5 μm or more and 75 μm or less. From the viewpoint of suppressing an increase in sheet resistance and improving the heating efficiency and the insulation breakdown resistance in the case where the sheet-shaped conductive member 1 is used as a heating body, the diameter (width D) of the conductive linear member 22 is more preferably 8 μm or more and 60 μm or less, and further preferably 12 μm or more and 40 μm or less.

[0073] In the case where the cross section of the conductive linear member 22 is elliptical, it is preferable that the major axis be 5 μm or more and 75 μm or less, more preferably 8 μm or more and 60 μm or less, and further preferably 12 μm or more and 40 μm or less. In the case where the cross section of the conductive linear member 22 is elliptical, it is preferable that the major axis of the conductive linear member 22 be arranged along the sheet surface of the pseudo-sheet structure 20.

[0074] As for the width D of the conductive linear bodies 22, using a digital microscope, the pseudo-sheet structure 20 was observed in plan view and the width of the conductive linear bodies 22 was measured at 5 random points and set as the average thereof.

[0075] Preferably, the volume resistivity R of the conductive linear bodies 22 is 1.0 x 10 -9 Ω·m or more and 1.0 x 10 -3 Ω·m or less, more preferably 1.0 x 10 -8 Ω·m or more and 1.0 x 10 -4 Ω·m or less. When the volume resistivity R of the conductive linear bodies 22 is within the above range, the surface resistance of the pseudo-sheet structure 20 becomes easy to decrease.

[0076] The volume resistivity R of the conductive linear bodies 22 was measured as follows. Silver paste was applied to both ends of the conductive linear bodies 22, the resistance of a 40 mm portion from the end was measured, and the resistance value of the conductive linear bodies 22 was calculated. Then, the cross-sectional area (unit: m 2 ) of the conductive linear bodies 22 was multiplied by the above resistance value and the obtained value was divided by the above measured length (0.04 m), to calculate the volume resistivity R of the conductive linear bodies 22.

[0077] Preferably, the pseudo-sheet structure 20 of the present embodiment is used for a sensor that oscillates a linearly polarized wave as an electromagnetic wave.

[0078] Preferably, the length direction of the conductive linear bodies 22 of the pseudo-sheet structure 20 of the present embodiment is arranged obliquely within a range of 70° or more and 110° or less with respect to the polarization plane of a linearly polarized wave oscillated from a sensor in which the pseudo-sheet structure 20 is used.

[0079] The polarization plane is a plane that includes the direction of electric field oscillation of a linearly polarized wave component and the direction of propagation of the linearly polarized wave component, Figure 2 indicates a simplified plan view of the pseudo-sheet structure 20 observed along the direction of propagation of the linearly polarized wave component.

[0080] For example, with respect to the polarization plane P1, the length direction of the conductive linear bodies 22 of the pseudo-sheet structure 20 is arranged obliquely at an angle θ1.

[0081] Also, for example, with respect to the polarization plane P2, the length direction of the conductive linear bodies 22 of the pseudo-sheet structure 20 is arranged obliquely at an angle θ2 (specifically, 90°).

[0082] For example, with respect to the polarization plane P3, the length direction of the conductive linear bodies 22 of the pseudo-sheet structure 20 is arranged obliquely at an angle θ3.

[0083] The length direction of the conductive linear bodies 22 of the pseudo-sheet structure 20 of the present embodiment is arranged obliquely in a range of 70° or more and 110° or less with respect to the polarization plane of the linearly polarized wave oscillated from the sensor, whereby transmission of electromagnetic waves oscillated from a different oscillation source than the sensor can be suppressed. Also, the interval L of the plurality of conductive linear bodies 22 satisfies the relationship "L ≤ 20 mm" in the above formula (1), so the interval L of the conductive linear bodies 22 from each other does not become excessively large, and temperature unevenness at the time of heating can be suppressed, and the effect of melting snow can be effectively exerted.

[0084] That is, the pseudo-sheet structure 20 of the present embodiment also functions as a filter with respect to electromagnetic waves oscillated from other oscillation sources (for example, other sensors, etc.). As a result, by the pseudo-sheet structure 20, erroneous operation of the sensor caused by electromagnetic waves oscillated from other oscillation sources can be suppressed.

[0085] Therefore, it is preferable that the pseudo-sheet structure 20 of the present embodiment be used as an electromagnetic wave filter that suppresses transmission of electromagnetic waves oscillated from an oscillation source different from the sensor and a heating element.

[0086] In the present embodiment, the conductive linear bodies 22 are not particularly limited as long as they satisfy the above formula (1).

[0087] As the conductive linear bodies 22, for example, a linear body containing a metal wire (hereinafter also referred to as a "metal wire linear body"), a linear body containing a carbon nanotube, a linear body on which a conductive coating has been applied, a metal foil, and the like can be given.

[0088] It is preferable that the conductive linear bodies 22 be metal wire linear bodies. Metal wires have high thermal conductivity, high electrical conductivity, high processability, and versatility. Therefore, when metal wire linear bodies are used as the conductive linear bodies 22, the resistance value of the pseudo-sheet structure 20 is reduced, and light transmittance is easily improved. Also, in the case where the conductive linear bodies 22 are metal wire linear bodies, when the sheet-shaped conductive member 1 or the pseudo-sheet structure 20 is used as a heating body, rapid heating is easily achieved. Also, as described above, by using metal wire linear bodies, it is easy to obtain conductive linear bodies 22 having a width D or a diameter that is thin.

[0089] The conductive linear bodies 22 can also be linear bodies containing metal wires. The linear bodies containing metal wires can be linear bodies composed of one metal wire, or linear bodies in which a plurality of metal wires are twisted.

[0090] As the metal wire, a wire line including a metal such as copper, aluminum, tungsten, iron, molybdenum, nickel, titanium, silver, gold, palladium, rhodium, platinum, or an alloy containing two or more of these metals (for example, stainless steel, carbon steel, and the like, brass, phosphor bronze, zirconium copper alloy, beryllium copper, iron-nickel, nickel-chromium alloy, nickel-titanium alloy, kanthal, hastelloy, and rhenium-tungsten, and the like) can be given. Also, the metal wire can be a wire line plated with tin, zinc, silver, nickel, chromium, nickel-chromium alloy, or solder, or the like, and can also be a wire line having a surface coated with a carbon material or a polymer, which will be described later. In particular, from the viewpoint of forming the conductive wire-like body 22 having a low volume resistivity, a wire line including one or more metals selected from tungsten, molybdenum, and alloys containing these metals is preferable.

[0091] As the metal wire, a wire line coated with a carbon material can also be given. When the metal wire is coated with a carbon material, the metallic luster is reduced, and the presence of the metal wire is easily made less noticeable. Also, when the metal wire is coated with a carbon material, metal corrosion is also inhibited.

[0092] As the carbon material coating the metal wire, amorphous carbon (for example, carbon black, activated carbon, hard carbon, soft carbon, mesoporous carbon, carbon fiber, and the like), graphite, fullerene, graphene, carbon nanotube, and the like can be given.

[0093] The conductive wire-like body 22 is also preferably a metal foil. As the metal foil of the conductive wire-like body 22, for example, a metal foil can also be obtained by processing a metal foil into a plurality of wire-like bodies arranged at an interval L by etching treatment or the like. Alternatively, a metal foil previously processed into a wire-like shape can also be arranged at an interval L.

[0094] The carbon nanotube linear body is obtained, for example, by pulling out carbon nanotubes in a sheet shape from the end of a carbon nanotube forest, which is a growth body in which carbon nanotubes are grown on a substrate in a manner of being oriented in a vertical direction with respect to the substrate, in multiple, sometimes referred to as an "array", bundling the pulled-out carbon nanotube sheet, and twisting the carbon nanotube bundle. In this manufacturing method, in the case where no twist is applied at the time of twisting, a ribbon-like carbon nanotube linear body is obtained, and in the case where a twist is applied, a linear body is obtained. The ribbon-like carbon nanotube linear body is a linear body that does not have a structure in which carbon nanotubes are twisted. In addition, the carbon nanotube linear body can also be obtained by spinning or the like from a dispersion liquid of carbon nanotubes. The manufacturing of the carbon nanotube linear body based on spinning can be performed, for example, by the method disclosed in U.S. Patent Application Publication No. 2013 / 0251619 (Japanese Patent Application Publication No. 2012-126635). From the viewpoint of obtaining uniformity in the diameter of the carbon nanotube linear body, it is desirable to use a linear carbon nanotube linear body, and from the viewpoint of obtaining a carbon nanotube linear body with high purity, it is preferable to obtain a linear carbon nanotube linear body by twisting a carbon nanotube sheet. The carbon nanotube linear body can also be a linear body in which two or more carbon nanotube linear bodies are woven with each other. Furthermore, the carbon nanotube linear body can also be a linear body in which carbon nanotubes are compounded with other conductive materials (hereinafter also referred to as a "composite linear body").

[0095] As the composite linear body, for example, there can be mentioned (i) a composite linear body in which a surface of a carbon nanotube forest, a sheet, or a bundle or a twisted linear body is caused to carry a metal single body or a metal alloy by evaporation, ion plating, sputtering, wet plating, or the like in a process of obtaining a carbon nanotube linear body by pulling out carbon nanotubes in a sheet shape from the end of a carbon nanotube forest and bundling the pulled-out carbon nanotube sheet and then twisting the carbon nanotube bundle, (ii) a composite linear body in which a carbon nanotube bundle is twisted together with a metal single body linear body or a metal alloy linear body or a composite linear body, and (iii) a composite linear body in which a metal single body linear body or a metal alloy linear body or a composite linear body is woven with a carbon nanotube linear body or a composite linear body, and the like.

[0096] Note that, in the composite linear body of (ii), the carbon nanotubes can also be caused to carry a metal in the same manner as the composite linear body of (i) at the time of twisting the carbon nanotube bundle. Furthermore, the composite linear body of (iii) is a composite linear body in the case where two linear bodies are woven, but as long as at least one metal single body linear body or metal alloy linear body or composite linear body is included, three or more of the carbon nanotube linear body or the metal single body linear body or the metal alloy linear body or the composite linear body can also be woven together.

[0097] As the metal of the composite linear body, for example, there can be mentioned metal monomers such as gold, silver, copper, iron, aluminum, nickel, chromium, tin, zinc, palladium, rhodium, platinum, and alloys containing at least one of these metal monomers (copper-nickel-phosphorus alloy, copper-iron-phosphorus-zinc alloy, and the like).

[0098] The conductive linear body 22 can also be a linear body on which a conductive coating is applied to the wire. As the wire, there can be mentioned a wire spun from a resin such as nylon, polyester, or the like. As the conductive coating, there can be mentioned a protective film of a metal, a conductive polymer, a carbon material, or the like. The conductive coating can be formed by plating or evaporation, or the like. The linear body on which the conductive coating is applied to the wire can maintain the flexibility of the wire and increase the conductivity of the linear body. That is, it is easy to reduce the resistance of the pseudo-sheet structure 20.

[0099] (Substrate)

[0100] In the sheet-shaped conductive member 1 of the present embodiment, the pseudo-sheet structure 20 is preferably supported by the substrate 10.

[0101] The material of the substrate 10 is not particularly limited as long as it can support the pseudo-sheet structure 20.

[0102] As the substrate 10, for example, there can be mentioned paper, a thermoplastic resin film, a cured product film of a curable resin, a metal foil, a nonwoven fabric, a fabric, a glass film, and the like. As the thermoplastic resin film, for example, there can be mentioned a resin film of a polyester-based, polycarbonate-based, polyimide-based, polyolefin-based, polyurethane-based, acrylic-based, or the like. The substrate 10 is preferably in a plate shape.

[0103] From the viewpoint of imparting light transmittance to the sheet-shaped conductive member 1, the substrate 10 is preferably light-transmissive.

[0104] (Resin layer)

[0105] In the sheet-shaped conductive member 1 of the present embodiment, the pseudo-sheet structure 20 is preferably fixed to the substrate 10 by the resin layer 30. By the resin layer 30, it is easy to fix the pseudo-sheet structure 20 to the surface of the substrate 10.

[0106] In the sheet-shaped conductive member 1 of the present embodiment, the conductive linear body 22 is preferably contained in the resin layer 30 of the substrate 10. The conductive linear body 22 is not entirely embedded in the resin layer 30, but is exposed on the surface of the resin layer 30. By containing the conductive linear body 22 in the resin layer 30, it is possible to suppress the misalignment of the conductive linear body 22.

[0107] From the viewpoint of imparting light transmittance to the sheet-shaped conductive member 1, the resin layer 30 is preferably light-transmissive.

[0108] The resin layer 30 contains a resin. The kind of the resin contained in the resin layer 30 is not particularly limited. The resin contained in the resin layer 30 can be either a curable resin or a non-curable resin. It is preferable that the resin layer 30 contain a curable resin. In the case where the resin layer 30 contains a curable resin, sufficient hardness for protecting the pseudo-sheet structure 20 can be imparted to the resin layer 30 by curing of the curable resin. Furthermore, the impact resistance of the resin layer 30 after curing is improved, and deformation of the resin layer 30 caused by an impact can also be suppressed. The curable resin contained in the resin layer 30 is preferably an energy ray-curable resin from the viewpoint of being able to be cured simply in a short time. Note that "energy ray curing" also includes thermal curing based on heating using an energy ray.

[0109] The resin contained in the resin layer 30 can be a single resin or two or more kinds of resins.

[0110] In the sheet-shaped conductive member 1 of the present embodiment, it is preferable that the resin layer 30 for fixing the pseudo-sheet structure 20 to the base material 10 contain a cured product of a curable resin.

[0111] As the resin component, it is preferable that the resin layer 30 further contain an adhesive. The adhesive contained in the resin layer 30 can also be a so-called heat-seal type adhesive that is adhered by heat, an adhesive that exhibits tackiness when wet, or the like. From the viewpoint of the ease of application to the sheet-shaped conductive member 1, it is preferable that the adhesive contained in the resin layer 30 be an adhesive (pressure-sensitive adhesive). The adhesive contained in the resin layer 30 is not particularly limited. For example, as the adhesive, there can be mentioned an acrylic adhesive, a urethane adhesive, a rubber adhesive, a polyester adhesive, a silicone adhesive, a polyvinyl ether adhesive, and the like. Among them, it is preferable that the adhesive be at least any one selected from the group consisting of an acrylic adhesive, a urethane adhesive, and a rubber adhesive, and more preferably an acrylic adhesive.

[0112] It is preferable that the adhesive contained in the resin layer 30 be a curable adhesive, and more preferably a curable adhesive (pressure-sensitive adhesive). As the curable adhesive, there can be mentioned an energy ray-curable adhesive, a heat-curable adhesive, and a naturally curable adhesive. In order to cure in a short time, it is preferable from the viewpoint of productivity that the adhesive contained in the resin layer 30 be an energy ray-curable adhesive.

[0113] As the energy ray-curable adhesive, for example, a radical-curable adhesive is preferably used. As the radical-curable adhesive, an energy ray-curable adhesive such as an electron beam-curable adhesive and an ultraviolet ray-curable adhesive can be exemplified. Particularly preferable is an energy ray-curable adhesive which can be cured in a short time, and further preferable is an ultraviolet ray-curable adhesive which can be cured by low energy.

[0114] The resin layer 30 can also contain an inorganic filler. By containing an inorganic filler in the resin layer 30, the hardness of the cured resin layer 30 can be further increased. Also, the thermal conductivity of the resin layer 30 is increased. Also, in the case where the adherend is mainly composed of glass, the linear expansion coefficient of the sheet-shaped conductive member 1 and the adherend can be made close to each other, whereby the reliability of the device obtained by adhering the sheet-shaped conductive member 1 to the adherend and curing as necessary is increased.

[0115] As the inorganic filler, for example, inorganic powder (for example, powder of silica, alumina, talc, calcium carbonate, titanium white, red iron oxide, silicon carbide, boron nitride, and the like), beads in which inorganic powder is spheroidized, single crystal fiber, glass fiber, and the like can be exemplified. Among them, as the inorganic filler, silica filler and alumina filler are preferable. One kind of inorganic filler can be used alone, or two or more kinds of inorganic fillers can be used in combination.

[0116] The resin layer 30 can also contain other components. As the other components, for example, known additives such as organic solvent, flame retardant, tackifier, ultraviolet absorber, antioxidant, antiseptic, antibacterial agent, plasticizer, defoaming agent, wetting property adjusting agent, and the like can be exemplified.

[0117] The thickness of the resin layer 30 is appropriately determined depending on the use of the sheet-shaped conductive member 1. For example, from the viewpoint of adhesion, the thickness of the resin layer 30 is preferably 3 μm or more and 150 μm or less, and more preferably 5 μm or more and 100 μm or less.

[0118] (Method for manufacturing the sheet-shaped conductive member)

[0119] The method for manufacturing the sheet-shaped conductive member of the present embodiment is not particularly limited. The sheet-shaped conductive member is manufactured, for example, by the following steps.

[0120] First, a laminate having a substrate 10 and a resin layer 30 formed on the surface of the substrate 10 is prepared. Next, conductive wires 22 are arranged on the surface of the resin layer 30 to form a pseudo-sheet structure 20. For example, with the resin layer 30 having the substrate 10 disposed on the outer peripheral surface of the roller member, the conductive wires 22 are spirally wound onto the surface of the resin layer 30 while the roller member is rotated. Then, the bundle of spirally wound conductive wires 22 is cut along the axial direction of the roller member. Thus, the pseudo-sheet structure 20 is formed and disposed on the resin layer 30. Then, the substrate 10 with the pseudo-sheet structure 20 disposed on the resin layer 30 is removed from the roller member. Through this process, a sheet-shaped conductive member 1 having a substrate 10, a resin layer 30, and a pseudo-sheet structure 20 can be obtained. According to this method, for example, by rotating the roller component while moving the conveying portion of the conductive wire 22 in a direction parallel to the axis of the roller component, it is possible to easily adjust the spacing L of adjacent conductive wires 22 in the pseudo-sheet structure 20 to satisfy the formula (1) or formula (2).

[0121] As another method of manufacturing the pseudo-sheet structure of this embodiment, the pseudo-sheet structure 20 can be manufactured by arranging conductive linear bodies 22 at intervals L in accordance with the formula (1) or formula (2). It is also possible to manufacture a sheet-like conductive component 1 by bonding the manufactured pseudo-sheet structure 20 together with the resin layer 30 of a laminate having a substrate 10 and a resin layer 30.

[0122] (Characteristics of sheet-like conductive components and sheet-like structures)

[0123] Electromagnetic wave transmittance

[0124] Preferably, the electromagnetic wave transmittance of the pseudo-sheet structure 20 in this embodiment in each frequency band of 20 GHz and above and 110 GHz and below is 60% or more, more preferably 70% or more and 100% or less, and even more preferably 80% or more and 100% or less.

[0125] By using a pseudo-sheet structure 20 with such electromagnetic wave transmittance, electromagnetic waves oscillating from the sensor can be transmitted more efficiently.

[0126] Electromagnetic wave transmittance in the frequency band above 20 GHz and below 110 GHz can be determined using a vector network analyzer (Keysight Technologies "N5290A") via the free-space S-parameter method.

[0127] • Light transmittance

[0128] The light transmittance of the sheet-shaped conductive member 1 and the pseudo-sheet member 20 of the present embodiment is preferably 70% or more, more preferably 70% or more and 100% or less, and further preferably 80% or more and 100% or less.

[0129] If the light transmittance is 70% or more, in the case where the sheet-shaped conductive member 1 or the pseudo-sheet member 20 is attached to the surface of an adherend, the influence on the designability of the adherend can be suppressed.

[0130] Note that the light transmittance of the sheet-shaped conductive member 1 and the pseudo-sheet member 20 is measured by a light transmittance meter for the light transmittance in the visible range (380 nm or more and 760 nm or less) and is set as the average value thereof.

[0131] (Method for using the sheet)

[0132] The sheet-shaped conductive member 1 of the present embodiment is used, for example, by being attached to an adherend. In the case where the resin layer 30 contains a curable resin, the resin layer 30 is cured after the sheet-shaped conductive member 1 is attached to the adherend. In attaching the sheet-shaped conductive member 1 to the adherend, either the pseudo-sheet member 20 side of the sheet-shaped conductive member 1 can be attached to the adherend (i.e., the pseudo-sheet member 20 is sandwiched between the resin layer 30 and the adherend and is attached to the adherend), or the substrate 10 side of the sheet-shaped conductive member 1 on which the resin layer 30 is not provided can be attached to the adherend.

[0133] The substrate 10 can also be peeled from the cured resin layer 30 after the pseudo-sheet member 20 side of the sheet-shaped conductive member 1 is attached to the adherend and the resin layer 30 is cured. Even in the case where the substrate 10 is peeled in this way, the pseudo-sheet member 20 can be sufficiently protected by the adherend and the cured resin layer 30, and thus the impact resistance of the pseudo-sheet member 20 can be obtained.

[0134] Further, in the case where the sheet-shaped conductive member 1 or the pseudo-sheet member 20 is used as a heating body, the resin layer 30 also contributes to the prevention of electric shock at the time of heating (at the time of power supply).

[0135] The sheet-shaped conductive member 1 or the pseudo-sheet member 20 of the present embodiment is preferably used as a snow-melting heater for a radar portion of a millimeter wave radar. More preferably, the sheet-shaped conductive member 1 or the pseudo-sheet member 20 of the present embodiment is used in a millimeter wave radar mounted on a vehicle. A millimeter wave radar uses electromagnetic waves in the millimeter wave band (about 60 GHz to 80 GHz. For example, 76 GHz (wavelength: 3.9 mm) or 79 GHz (wavelength: 3.8 mm)) to detect an object to be detected. Water droplets and snow have high absorption characteristics, and thus it is difficult to detect electromagnetic waves when water droplets and snow adhere to the surface layer of the radar.

[0136] In the sheet-shaped conductive member 1 or the pseudo-sheet structure 20 of the present embodiment, the conductive linear bodies 22 are arranged at appropriate intervals represented by Formula (1) or Formula (2) using the frequency (or wavelength) of the electromagnetic wave oscillated from the sensor. Thus, the sheet-shaped conductive member 1 or the pseudo-sheet structure 20 of the present embodiment exhibits a heater function and can effectively remove water droplets and snow, and can efficiently transmit electromagnetic waves.

[0137] Also, the pseudo-sheet structure of the present embodiment also easily transmits electromagnetic waves of a frequency band used in the fifth-generation mobile communication system (for example, 28 GHz (wavelength 10.7 mm) or 39 GHz (wavelength 7.7 mm)), and thus can also be favorably applied to a sensor that oscillates electromagnetic waves of the 5G band.

[0138] Also, it is preferable to apply the sheet-shaped conductive member 1 or the pseudo-sheet structure 20 as a heating body in a heating device 50. For example, Figure 3 The drawing indicates a schematic plan view of the heating device 50.

[0139] The heating device 50 has the heating body of the present embodiment (the sheet-shaped conductive member 1 or the pseudo-sheet structure 20 of the present embodiment) and an electrode portion 40 that supplies power to the pseudo-sheet structure 20 of the heating body.

[0140] (Electrode)

[0141] The electrode portion 40 is used to supply current to the conductive linear bodies 22. The electrode portion 40 is arranged to be electrically connected to both end portions of the conductive linear bodies 22.

[0142] Even in the case where the width D or diameter of the conductive linear bodies 22 is small, it is preferable for the electrode portion 40 to be a strip from the viewpoint of being able to ensure a good contact area with the conductive linear bodies 22. As the electrode portion 40, a foil or a plate of a conductive material can be used.

[0143] As the electrode portion 40, specifically, a foil or a plate of a metal such as gold, silver, copper, nickel, iron, aluminum, tungsten, molybdenum, palladium, rhodium, platinum, and titanium is used. In addition, the electrode portion 40 can also use a foil or a plate of an alloy such as stainless steel, carbon steel, brass, phosphor bronze, zirconium copper alloy, beryllium copper, iron-nickel, nickel-chromium alloy, nickel-titanium alloy, Kanthal heat-resistant steel, hastelloy steel, and rhenium-tungsten, which contain the above-described metal or other metal, non-metal elements, and can also use a strip-shaped body containing a carbon material such as a carbon nanotube, carbon nanofiber, graphene. Also, the electrode portion 40 can be a laminate of a foil or a plate of these metals, a foil or a plate of these alloys, or a strip-shaped body containing a carbon material and a plastic film.

[0144] In addition, from the viewpoint of ensuring a good connection state of the electrically conductive linear member 22 and the electrode portion 40, the electrode portion 40 can also be an electrode in which a liquid conductive material is solidified (i.e., an electrode composed of a solidified product of a liquid conductive material). As the liquid conductive material, a conductive paste can be typically cited. As the conductive paste, for example, a paste in which metal particles or carbon particles are dispersed in a binder resin and / or an organic solvent can be used. As the metal particles, for example, particles of metals such as gold, silver, copper, and nickel can be cited. As the binder resin, for example, publicly known resins such as polyester resins, polyurethane resins, epoxy resins, and phenol resins can be cited.

[0145] Note that, as the liquid conductive material, in addition to the conductive paste, for example, solder and conductive ink can also be applied.

[0146] The electrode portion 40 can also use a foil or a plate that is electrically conductive in combination with the liquid conductive material. Either the foil or the plate that is electrically conductive can be attached after the liquid conductive material is applied to the pseudo-sheet structure 20, or the liquid conductive material can be applied after the foil or the plate that is electrically conductive and in which through holes are formed is installed.

[0147] By using the foil or the plate that is electrically conductive in combination with the liquid conductive material, the connection of the electrode portion 40 and the electrically conductive linear member 22 becomes better.

[0148] In addition, a member in which a plurality of electrically conductive linear members 22 are closely arranged can also be used as the electrode portion 40.

[0149] The ratio of the resistance values of the electrode portion 40 and the pseudo-sheet structure 20 is preferably 0.0001 or more and 0.3 or less, and more preferably 0.0005 or more and 0.1 or less. The ratio of the resistance values of the electrode portion 40 and the pseudo-sheet structure 20 can be calculated by "resistance value of the electrode portion 40 / resistance value of the pseudo-sheet structure 20". By making the ratio of the resistance values of the electrode portion 40 and the pseudo-sheet structure 20 within this range, abnormal heat generation in the electrode portion in the case where the sheet-shaped conductive member 1 is used as a heat generating body can be suppressed. In the case where the pseudo-sheet structure 20 is used as a thin film heater, only the pseudo-sheet structure 20 generates heat, and a thin film heater with good heat generation efficiency can be obtained.

[0150] The resistance values of the electrode portion 40 and the pseudo-sheet structure 20 can be measured using a multimeter. First, the resistance value of the electrode portion 40 is measured, and the resistance value of the pseudo-sheet structure 20 to which the electrode portion 40 is attached is measured. Then, the resistance values of the electrode portion 40 and the pseudo-sheet structure 20 are calculated by subtracting the measured value of the electrode portion 40 from the resistance value of the pseudo-sheet structure 20 to which the electrode is attached.

[0151] The thickness of the electrode portion 40 is preferably 2 μm or more and 200 μm or less, more preferably 2 μm or more and 120 μm or less, and even more preferably 10 μm or more and 100 μm or less. If the electrode thickness is within the above range, the conductivity is high and the resistance is low, thus suppressing the resistance value of the pseudo-sheet structure to a low level. Furthermore, it achieves sufficient strength as an electrode.

[0152] According to this embodiment, a sheet-like structure that efficiently transmits electromagnetic waves and has a heater function can be provided. Furthermore, according to this embodiment, a sheet-like conductive member having a sheet-like structure that efficiently transmits electromagnetic waves and has a heater function can be provided.

[0153] [Second Implementation]

[0154] (Sensor device)

[0155] Next, the second embodiment of the present invention will be described.

[0156] This embodiment relates to a sensor device. In the following description, the parts that differ from the first embodiment will be described primarily, and repeated descriptions will be omitted or simplified. For structures identical to those in the first embodiment, the same reference numerals will be used, and descriptions will be omitted or simplified.

[0157] The sensor device of this embodiment has the pseudo-sheet structure of the above embodiment and a sensor that oscillates electromagnetic waves in a frequency band of 20 GHz or higher and 100 GHz or lower.

[0158] Alternatively, the sensor device of this embodiment may have a sheet-like conductive component as described in the above embodiment and a sensor that oscillates electromagnetic waves in a frequency band of 20 GHz or higher and 100 GHz or lower.

[0159] Figure 4 The diagram shows a simplified cross-sectional view of the sensor device 100 according to this embodiment.

[0160] The sensor device 100 of this embodiment includes a sheet-like conductive member 1 and a sensor 110. The sensor device 100 of this embodiment also includes a protective member 120.

[0161] like Figure 4 As shown, the preferably sheet-like conductive component 1 is disposed between the sensor 110 and the protective component 120. Figure 4 In this embodiment, the resin layer 30 side of the sheet-like conductive component 1 is positioned opposite the protective component 120, and the substrate 10 side is positioned opposite the sensor 110. However, the present invention is not limited to this configuration. For example, the resin layer 30 side of the sheet-like conductive component 1 may also be positioned opposite the sensor 110, and the substrate 10 side may be positioned opposite the protective component 120.

[0162] In the sensor device 100 of the present embodiment, the interval L of the conductive linear bodies 22 of the pseudo sheet-like structure 20 satisfies the above-described formula (1) defined by the frequency of the electromagnetic wave oscillated by the sensor 110, and preferably satisfies formula (2).

[0163] In the sensor device 100 of the present embodiment, the width D of the conductive linear bodies 22 of the pseudo sheet-like structure 20 preferably satisfies formula (3) defined by the frequency of the electromagnetic wave oscillated by the sensor 110.

[0164] The sensor 110 of the sensor device of the present embodiment is preferably a sensor that oscillates a linearly polarized wave as an electromagnetic wave.

[0165] In the sensor device 100 of the present embodiment, for the conductive linear bodies 22 of the pseudo sheet-like structure 20, the length direction of the conductive linear bodies 22 is preferably arranged to be inclined within a range of 70° or more and 110° or less with respect to the polarization plane of the linearly polarized wave oscillated from the sensor 110, and the pseudo sheet-like structure 20 is preferably fixed to the sensor 110 in a manner that satisfies the range of the inclination. The range of the inclination is more preferably a range of 80° or more and 100° or less, and further preferably a range of 85° or more and 95° or less.

[0166] In the sensor device 100 of the present embodiment, by arranging the length direction of the conductive linear bodies 22 to be inclined within a range of 70° or more and 110° or less with respect to the polarization plane of the linearly polarized wave oscillated from the sensor 110, the transmission of the electromagnetic wave oscillated from an oscillation source different from the sensor 110 can be suppressed. Also, the interval L of the plurality of conductive linear bodies 22 satisfies the relationship of "L≤20 mm" in the above-described formula (1), and thus the interval L of the conductive linear bodies 22 from each other does not become excessively large, and the transmission of the electromagnetic wave oscillated from the other oscillation source can be suppressed.

[0167] That is, by making the inclination angle of the length direction of the conductive linear bodies 22 with respect to the polarization plane of the electromagnetic wave satisfy the above-described range, the sensor device 100 of the present embodiment also has a function of shielding the electromagnetic wave oscillated from another oscillation source (for example, another sensor, etc.). As a result, the sensor device 100 is less likely to cause a malfunction of the sensor 110 caused by an external electromagnetic wave.

[0168] [Variations of the Embodiment]

[0169] The present application is not limited to the above-described embodiment, and includes variations, modifications, and the like within the scope of achieving the object of the present application.

[0170] In the foregoing embodiment, a case where the plurality of electrically conductive linear bodies 22 are supported by the base material 10 is exemplified, but the present application is not limited to such a case. For example, a sheet-like conductive member in which the plurality of electrically conductive linear bodies 22 are supported by the resin layer 30 can also be provided. In this case, in a case where the resin layer 30 has adhesiveness, the pseudo-sheet structure 20 can be attached to an adherend via the resin layer 30.

[0171] In the foregoing embodiment, a case where the sheet-like conductive member 1 has the electrode portion 40 is exemplified, but the present application is not limited to such a case. For example, the sheet-like conductive member 1 can also not have the electrode portion 40. The electrode portion 40 can also be provided in advance in an article to which the sheet-like conductive member is attached, and the sheet-like conductive member can be attached in such a manner that the pseudo-sheet structure 20 contacts the electrode portion 40.

[0172] Example

[0173] Hereinafter, the present application will be further explained by citing examples. The present application is not limited to any of these examples.

[0174] [Example 1]

[0175] An adhesive sheet was wound around a rubber roller. As the adhesive sheet, a sheet (size: 120 mm x 120 mm) having an acrylic film (manufactured by Mitsubishi Chemical Corporation, "acryplen", thickness 75 μm) as a base material and an adhesive layer (manufactured by Lindcote Corporation, "PK", thickness 20 μm) laminated to the base material was used. The adhesive sheet was wound around the rubber roller in such a manner that the adhesive face of the adhesive layer faces outward and is free from wrinkles. After the winding, both end portions of the adhesive sheet in the circumferential direction of the rubber roller were fixed with double-sided tape.

[0176] A stainless steel electrically conductive linear body (manufactured by TOKUSAI TUNG, "SUS304", diameter D: 35 μm) wound around a bobbin was attached to the surface of the adhesive sheet near the end portion of the rubber roller. Then, the linear body was wound around the rubber roller while being unwound from the bobbin. While winding the linear body, the rubber roller was moved little by little in a direction parallel to the roller axis to draw a spiral at a constant interval and wind the linear body around the rubber roller.

[0177] The adhesive sheet was cut at every stainless steel linear body in parallel to the roller axis to obtain a sheet-like conductive member in which a pseudo-sheet structure in which stainless steel linear bodies are arranged is laminated to the adhesive sheet.

[0178] As for the diameter D of the linear body and the interval L of the arrangement of the linear body of the pseudo-sheet structure, the diameter D of the linear body was 35 μm and the interval L of the arrangement of the linear body was 0.130 mm.

[0179] Further, an acrylic film with electrodes as the adherend was prepared. The acrylic film with electrodes was produced by adhering a pair of copper tapes (width 10 mm, length 130 mm, thickness 35 μm) as electrodes to an acrylic film (manufactured by Mitsubishi Chemical Corporation, "acryplen" thickness 75 μm).

[0180] The sheet-shaped conductive member produced was adhered to the acrylic film with electrodes, and the copper tapes as electrodes were electrically connected to both ends of the stainless wire-shaped body, respectively. In this way, the heating device of Example 1 was obtained.

[0181] [Example 2]

[0182] The heating device of Example 2 was produced in the same manner as in Example 1, except that the conductive wire-shaped body was changed to a tungsten conductive wire-shaped body (manufactured by TOKUSAI TUNG MOIY, "TWG-CS", diameter D: 14 μm) and the interval L of the conductive wire-shaped body was changed to 1.000 mm.

[0183] [Example 3]

[0184] The heating device of Example 3 was produced in the same manner as in Example 1, except that the conductive wire-shaped body was changed to a gold-plated stainless steel wire (manufactured by TOKUSAI TUNG MOIY, "SUS304-Aup", diameter D: 35 μm) and the interval L of the conductive wire-shaped body was changed to 3.000 mm.

[0185] [Example 4]

[0186] The heating device of Example 4 was produced in the same manner as in Example 2, except that the interval L of the tungsten wire-shaped body as the conductive wire-shaped body was changed to 3.000 mm.

[0187] [Example 5]

[0188] The heating device of Example 5 was produced in the same manner as in Example 1, except that the stainless steel wire-shaped body as the conductive wire-shaped body was changed to a nickel wire (manufactured by TOKUSAI TUNG MOIY, "Ni wire", diameter D: 30 μm) and the interval L of the conductive wire-shaped body was changed to 9 mm.

[0189] [Comparative Example 1]

[0190] The heating device of Comparative Example 1 was produced in the same manner as in Example 1, except that the interval L of the conductive wire-shaped body was changed to 0.100 mm.

[0191] [Comparative Example 2]

[0192] The heating device of Comparative Example 2 was manufactured in the same manner as in Example 2 except that the interval L of the electrically conductive linear bodies was changed to 25 mm.

[0193] [Transmittance measurement method]

[0194] For the manufactured heating device, a vector network analyzer ("N5290A" manufactured by Agilent Technologies, Inc.) was used to measure the electromagnetic wave transmittance (S21) at the oscillation frequency of the sensor by a free space type S parameter method in a frequency band of 20 GHz or more and 110 GHz or less, while changing the angle of the polarization plane to the electrically conductive linear bodies as shown in Table 1. The angle was adjusted to the inclined angle shown in Table 1 and measured as shown in FIG. 2. Figure 5 The angle θ2 at which the length direction of the electrically conductive linear bodies 22 was inclined with respect to the polarization plane P2 of the linearly polarized wave that was oscillated was adjusted to the inclined angle shown in Table 1 and measured as shown in FIG. 2. Figure 5 is a schematic perspective view showing a state in which the angle θ2 of the length direction of the electrically conductive linear bodies 22 of the pseudo sheet structure 20 is inclined at 90°. Figure 6 is a graph showing the relationship between the angle of the length direction of the electrically conductive linear bodies with respect to the polarization plane and the electromagnetic wave transmittance with respect to the heating devices of Example 1 and Comparative Example 1.

[0195] [Confirmation of heating efficiency, temperature rise test]

[0196] A thin film thermocouple ("GMT-TC-SB7.5(P)" manufactured by GOMAT Co., Ltd.) was used to measure the temperature rise ΔT of the vicinity of the center of the manufactured heating device in a state in which the heating device stably generated heat without temperature unevenness in the heating region at an output condition of 0.1 W / cm 2 The unit of the temperature rise ΔT was K (Kelvin). In a case in which the temperature unevenness in the heating region was large, it was considered that the temperature unevenness was large.

[0197] [Table 1]

[0198]

[0199] The pseudo sheet structures of the heating devices of Examples 1 to 5 in which a plurality of electrically conductive linear bodies were arranged at an interval L satisfying the formula (1) exhibited good electromagnetic wave transmittance and heating efficiency. The pseudo sheet structures of Examples 1 to 5 efficiently transmitted electromagnetic waves and exhibited a heater function.

[0200] The pseudo sheet-like structure of the heat generating device of Comparative Example 1 has a narrow interval of the electrically conductive linear bodies, and the angle of the electrically conductive linear bodies with respect to the polarization plane is also greatly inclined, so that the electromagnetic wave transmittance is low. The pseudo sheet-like structure of the heat generating device of Comparative Example 2 is not manufactured with the interval L of the linear bodies satisfying the formula (1), and the heating unevenness is large. It is considered that this is caused by the interval of the plurality of electrically conductive linear bodies in the pseudo sheet-like structure of Comparative Example 2 being too wide.

[0201] BRIEF DESCRIPTION OF DRAWINGS

[0202] 1…sheet-like conductive member, 10…base material, 100…sensor device, 110…sensor, 20…pseudo sheet-like structure, 22…electrically conductive linear body, 30…resin layer, 40…electrode portion, 50…heat generating device, D…width, L…interval, P1…polarization plane, P2…polarization plane, P3…polarization plane.

Claims

1. A sheet-like conductive member having a quasi-sheet-like structure, which is used in a sensor that oscillates electromagnetic waves in a frequency band of 20 GHz or more and 100 GHz or less; a base material that supports the quasi-sheet-like structure, characterized in that: the quasi-sheet-like structure is composed of a plurality of electrically conductive linear bodies arranged at intervals, the quasi-sheet-like structure is fixed to the base material by a resin layer, the resin layer contains a curable adhesive, electromagnetic waves oscillated from the sensor are linearly polarized waves, the electrically conductive linear bodies are arranged so that a length direction of the electrically conductive linear bodies is inclined in a range of 70° or more and 110° or less with respect to a polarizing plane of the linearly polarized waves, a width D of the electrically conductive linear bodies when the quasi-sheet-like structure is viewed from above is 5 μm or more and 40 μm or less, and an interval L of the plurality of electrically conductive linear bodies satisfies the following formula (1).

2. The sheet-like conductive member according to claim 1, wherein the interval L of the plurality of electrically conductive linear bodies satisfies the following formula (2).

3. The sheet-like conductive member according to claim 1 or 2, wherein the quasi-sheet-like structure is used as an electromagnetic wave filter that suppresses transmission of electromagnetic waves oscillated from a different oscillation source than the sensor and as a heating element.

4. A sensor device having: the sheet-like conductive member according to any one of claims 1 to 3; and a sensor that oscillates electromagnetic waves in a frequency band of 20 GHz or more and 100 GHz or less. ​ ​ ​ ​ The width D of the conductive linear bodies when the pseudo-sheet structure is viewed from above satisfies the following equation (3), 0.034 x λ S ≤ L ≤ 20 mm... (1), D < 0.013 x λ S …(3), In the formula (1) and the formula (3), λ S is a wavelength of an electromagnetic wave oscillated from the sensor, L, D and λ S have units of mm. ​ ​ 0.034 x λ S ≤ L ≤ 0.86 x λ S … (2), In the formula (2), λ S is the wavelength of the electromagnetic wave oscillating from the sensor, L and λ S are in mm. ​ ​ ​ ​ ​

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