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

Abstract

A pseudo sheet structure (20) for use in a sensor which oscillates an electromagnetic wave of a band of 20-100 GHz comprises a plurality of conductive linear bodies (22) arranged at intervals, wherein an interval L of conductive linear bodies (22) satisfies the following expression (1).　(1): 0.034×λS≤L≤20 mm In expression (1), L indicates the interval of the conductive linear bodies (22), λS indicates the wavelength of the electromagnetic wave oscillated by the sensor, and units of L and λS are mm.

Description

[Technical Field]

[0001] The present invention relates to a pseudo-sheet structure, a sheet-like conductive member, and a sensor device. [Background technology]

[0002] Currently, millimeter-wave lasers with frequencies of 76 GHz (3.9 mm) or 79±4 GHz (3.6 mm to 3.8 mm to 4.0 mm) are used in millimeter-wave radar, AIDAS (Attention Interest Desire Action Satisfaction), road signs, etc. Also, LiDAR (Light Detection and Ranging) uses silicon-based lasers with a wavelength of 950 nm or gallium arsenide-based communication lasers with a wavelength of 1550 nm. Therefore, the wavelength of the radar used is 900nm to 1600nm, as used in LiDAR, or 3.5mm to 4.4mm, as used in millimeter wave radar. Typically, such radars obtain location information by detecting the electromagnetic waves that are reflected and returned by the polarized waves emitted by the radar itself. Therefore, if an object that reflects or absorbs the polarized waves emitted or emitted by the radar is placed on the surface of each radar, it becomes difficult to obtain accurate location information. In vehicles where the radar is installed under the emblem, attenuation is avoided by, for example, creating cracks in the metal foil film used in the emblem. Furthermore, heaters are sometimes used to reduce attenuation due to snow accumulation on the emblem, but heaters made of ITO (indium tin oxide) cannot be used because of the high attenuation.

[0003] For example, Patent Document 1 describes a transparent heating element that is placed facing a sensor. This transparent heating element has multiple connecting conductors that connect a pair of bus bars. Patent Document 1 describes that the resistance value of the heating conductor can be appropriately controlled by specifying the arrangement direction of the connecting conductors and the number of times the connecting conductors are folded back. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Publication No. 2019-96617 Summary of the Invention [Problem to be solved by the invention]

[0005] As mentioned above, heaters mounted on sensors are required to have not only a heating function but also excellent electromagnetic wave transmittance, but Patent Document 1 does not describe detailed conditions for obtaining a heater that combines excellent electromagnetic wave transmittance and heating function.

[0006] An object of the present invention is to provide a pseudo sheet structure that efficiently transmits electromagnetic waves and has a heating function. Another object of the present invention is to provide a sheet-like conductive member that includes the pseudo sheet structure. Another object of the present invention is to provide a sensor device that includes the pseudo sheet structure or the sheet-like conductive member. [Means for solving the problem]

[0007] According to one aspect of the present invention, there is provided a pseudo sheet structure for use in a sensor that emits electromagnetic waves in a band of 20 GHz or more and 100 GHz or less, comprising: the pseudo sheet structure is made up of a plurality of conductive linear bodies arranged at intervals; The interval L between the plurality of conductive linear bodies satisfies the following formula (1): A pseudo seat structure is provided. 0.034×λ S ≦L≦20mm …(1) In the above formula (1), λ S is the wavelength of the electromagnetic wave emitted from the sensor, and L and λ S The unit is mm.

[0008] In the pseudo sheet structure according to one aspect of the present invention, it is preferable that the interval L between the plurality of conductive linear bodies satisfies the following formula (2). 0.034×λ S ≦L≦0.86×λ S …(2) In the above formula (2), λ S is the wavelength of the electromagnetic wave emitted from the sensor, and L and λ S The unit is mm.

[0009] In the pseudo sheet structure according to one aspect of the present invention, it is preferable that the width D of the conductive linear body when the pseudo sheet structure is viewed from above satisfies the following formula (3). D≦0.013×λ S …(3) In the above formula (3), λ S is the wavelength of the electromagnetic wave emitted from the sensor, and D and λ S The unit is mm.

[0010] In a pseudo sheet structure according to one embodiment of the present invention, it is preferable that the electromagnetic wave emitted from the sensor is linearly polarized, and that the conductive linear elements are arranged so that their longitudinal directions are inclined at an angle of 70° or more and 110° or less relative to the polarization plane of the linearly polarized wave.

[0011] In one aspect of the pseudo sheet structure of the present invention, the pseudo sheet structure is preferably used as an electromagnetic wave filter that suppresses the transmission of electromagnetic waves emitted from an oscillation source other than the sensor, and also as a heating element.

[0012] According to one aspect of the present invention, there is provided a sheet-like conductive member comprising a pseudo sheet structure according to one aspect of the present invention and a substrate supporting the pseudo sheet structure.

[0013] In the sheet-shaped conductive member according to one aspect of the present invention, the pseudo sheet structure is preferably fixed to the base material by a resin layer.

[0014] In the sheet-shaped conductive member according to one aspect of the present invention, the resin layer preferably contains a cured product of a curable resin.

[0015] According to one aspect of the present invention, there is provided a sensor device including a pseudo sheet structure according to one aspect of the present invention and a sensor that emits electromagnetic waves in a band of 20 GHz or more and 100 GHz or less.

[0016] According to one aspect of the present invention, there is provided a sensor device including a sheet-shaped conductive member according to one aspect of the present invention and a sensor that oscillates electromagnetic waves in a band of 20 GHz or more and 100 GHz or less.

[0017] According to one aspect of the present invention, a pseudo sheet structure that efficiently transmits electromagnetic waves and has a heating function can be provided. Another aspect of the present invention also provides a sheet-like conductive member that includes the pseudo sheet structure. Another aspect of the present invention also provides a sensor device that includes the pseudo sheet structure or the sheet-like conductive member. [Brief explanation of the drawings]

[0018] [Figure 1] 1 is a schematic cross-sectional view of a sheet-shaped conductive member including a pseudo sheet structure according to one embodiment. [Figure 2] 1 is a schematic plan view of a sheet-shaped conductive member including a pseudo sheet structure according to an embodiment; [Figure 3] 1 is a schematic plan view of a heat generating device having a pseudo sheet structure and electrodes according to one embodiment; [Figure 4] 1 is a schematic cross-sectional view of a sensor device having a pseudo sheet structure and a sensor according to one embodiment. [Figure 5] 10 is a schematic perspective view for explaining the arrangement of the longitudinal direction of the conductive linear body and the polarization plane of the linearly polarized wave. FIG. [Figure 6] 10 is a graph showing the relationship between the angle of the longitudinal direction of the conductive linear body with respect to the polarization plane and the electromagnetic wave transmittance. DETAILED DESCRIPTION OF THE INVENTION

[0019] The present invention will be described below with reference to the drawings, taking an embodiment as an example. The present invention is not limited to the content of the embodiment. In the drawings, some parts are illustrated enlarged or reduced in size for ease of explanation.

[0020] [First embodiment] (Sheet-shaped conductive material) FIG. 1 shows a schematic cross-sectional view of a sheet-shaped conductive member 1 including a pseudo sheet structure 20 according to this embodiment.

[0021] FIG. 2 shows a schematic plan view of a sheet-shaped conductive member 1 including a pseudo sheet structure 20 according to this embodiment.

[0022] The sheet-like conductive member 1 according to this embodiment includes a pseudo sheet structure 20 and a substrate 10 that supports the pseudo sheet structure 20 (see FIGS. 1 and 2). The pseudo sheet structure 20 is fixed to the substrate 10 by a resin layer 30 (see FIGS. 1 and 2).

[0023] (pseudo seat structure) The pseudo sheet structure 20 in the present invention refers to a sheet-like structure in which a plurality of conductive linear members 22 are arranged at intervals. The pseudo sheet structure 20 according to this embodiment is used in a sensor that emits electromagnetic waves in the band of 20 GHz or more and 100 GHz or less. The pseudo sheet structure 20 includes a plurality of conductive linear members 22. In the pseudo sheet structure 20, the plurality of conductive linear members 22 are arranged at intervals. That is, the pseudo sheet structure 20 is made up of a plurality of conductive linear members 22 arranged at intervals. It is preferable that each of the plurality of conductive linear members 22 extends in one direction. It is also preferable that each of the plurality of conductive linear members 22 is arranged in parallel.

[0024] In the pseudo sheet structure 20 according to this embodiment, the interval L between the plurality of conductive linear members 22 satisfies the following formula (1). 0.034×λ S ≦L≦20mm …(1) In the formula (1), L is the spacing between the multiple conductive linear bodies 22, and λ S is the wavelength of the electromagnetic wave emitted from the sensor in which the pseudo sheet structure 20 is used, and L and λ S The unit is mm.

[0025] The wavelength λ [m] for a frequency f [Hz] can be calculated using the following formula: λ=c / f c is the speed at which electromagnetic waves propagate (phase velocity), and is equal to the speed of light.

[0026] In the pseudo sheet structure 20 according to this embodiment, the interval L between the adjacent conductive linear members 22 is set to "0.034 × λ" in the formula (1). S Since the relationship "L≦L" is satisfied, the pseudo sheet structure 20 can efficiently transmit electromagnetic waves emitted from the sensor. Furthermore, since the spacing L between the multiple conductive linear bodies 22 satisfies the relationship "L≦20 mm" in formula (1), the spacing L between the conductive linear bodies 22 does not become too large. Therefore, the pseudo sheet structure 20 as a heating element can also function as a heater with a uniform temperature rise distribution while maintaining low resistance.

[0027] In the pseudo sheet structure 20 according to this embodiment, the interval L between the plurality of conductive linear members 22 preferably satisfies the following formula (2). 0.034×λ S ≦L≦0.86×λ S …(2) In the formula (2), L is the interval between the conductive linear bodies 22, and λ S is the wavelength of the electromagnetic wave emitted from the sensor in which the pseudo sheet structure 20 is used, and L and λ S The unit is mm.

[0028] In the pseudo sheet structure 20 according to this embodiment, when the spacing L between the multiple conductive linear members 22 satisfies the above formula (2), the pseudo sheet structure 20 can more efficiently reflect electromagnetic waves emitted from other sensors. Furthermore, the heating function of the pseudo sheet structure 20 is also improved.

[0029] The interval L between the conductive linear members 22 is preferably 20 mm or less. If the interval L between the conductive linear members 22 is 20 mm or less, the variation in heat generation within the plane of the pseudo sheet structure 20 can be suppressed.

[0030] The interval L between the multiple conductive linear bodies 22 is the interval between the conductive linear bodies 22. Note that the interval between two adjacent conductive linear bodies 22 is the length between the conductive linear bodies 22 arranged in the same direction, and is the length between the opposing portions of the two conductive linear bodies 22 (see FIG. 1). When the conductive linear bodies 22 are arranged at uneven intervals, the interval L is the average value of the intervals between all adjacent conductive linear bodies 22. From the viewpoint of making it easier to control the value of the interval L, it is preferable that the conductive linear bodies 22 are arranged at approximately equal intervals in the pseudo sheet structure 20, and it is more preferable that they are arranged at equal intervals. The distance L between the conductive linear members 22 is measured by observing the conductive linear members 22 of the pseudo sheet structure 20 using a digital microscope and measuring the distance between two adjacent conductive linear members 22.

[0031] The cross-sectional shape of the conductive linear body 22 is not particularly limited. Examples of the cross-sectional shape of the conductive linear body 22 include a polygonal shape, a flat shape, an elliptical shape, a circular shape, and a thin film shape. The pseudo sheet structure 20 according to this embodiment has a plurality of conductive linear bodies 22 each having a substantially circular cross section, but the present invention is not limited to the cross-sectional shape of the conductive linear body 22 according to this embodiment. From the viewpoint of compatibility with the resin contained in the resin layer 30 that fixes the pseudo sheet structure 20 to the substrate 10, it is also preferable that the cross-sectional shape of the conductive linear body 22 be an elliptical shape or a circular shape.

[0032] It is preferable that the width D of the conductive linear member 22 when the pseudo sheet structure 20 is viewed in plan view satisfies the following formula (3). D≦0.013×λ S …(3) In the formula (3), D is the width of the conductive linear body 22, and λ S is the wavelength of the electromagnetic wave emitted from the sensor in which the pseudo sheet structure 20 is used, and D and λ S The unit is mm.

[0033] In the pseudo sheet structure 20 of this embodiment, the width D of the conductive linear body 22 satisfies the above formula (3), so that the electromagnetic waves emitted from the sensor can be prevented from being reflected by the pseudo sheet structure 20.

[0034] The conductive linear members 22 are preferably linear or wavy in a plan view of the pseudo sheet structure 20. Examples of the wavy shape of the conductive linear members 22 include a sine wave, a rectangular wave, a triangular wave, and a sawtooth wave. If the pseudo sheet structure 20 has the above-described structure, breakage of the conductive linear members 22 can be suppressed when the sheet-like conductive member 1 is stretched in the axial direction of the conductive linear members 22. Even if the sheet-shaped conductive member 1 is stretched in a direction perpendicular to the axial direction of the conductive linear members 22, the conductive linear members 22 are unlikely to be cut. Therefore, the sheet-shaped conductive member 1 has sufficient stretchability.

[0035] The number of conductive linear members 22 is not particularly limited as long as a plurality of conductive linear members 22 are arranged in the pseudo sheet structure 20. The number of conductive linear members 22 in the pseudo sheet structure 20 is preferably set, for example, from the viewpoint of exhibiting a heater function.

[0036] In the pseudo sheet structure 20, the conductive linear members 22 are preferably arranged at equal intervals in a direction perpendicular to the axial direction of the conductive linear members 22.

[0037] When 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 Figures 1 and 2. The diameter (width D) of the conductive linear member 22 is preferably 5 µm or more and 75 µm or less. From the viewpoint of suppressing an increase in sheet resistance and improving heat generation efficiency and dielectric breakdown resistance when the sheet-shaped conductive member 1 is used as a heating element, the diameter (width D) of the conductive linear member 22 is more preferably 8 µm or more and 60 µm or less, and even more preferably 12 µm or more and 40 µm or less. When the cross section of the conductive linear body 22 is elliptical, the major axis is preferably 5 μm or more and 75 μm or less, more preferably 8 μm or more and 60 μm or less, and even more preferably 12 μm or more and 40 μm or less. When the cross section of the conductive linear body 22 is elliptical, the major axis of the conductive linear body 22 is preferably aligned along the sheet surface of the pseudo sheet structure 20.

[0038] The width D of the conductive linear body 22 is determined by observing the conductive linear body 22 in a plan view of the pseudo sheet structure 20 using a digital microscope, measuring the width of the conductive linear body 22 at five randomly selected locations, and taking the average value.

[0039] The volume resistivity R of the conductive linear body 22 is 1.0×10 -9 Ω m or more, 1.0×10 -3 It is preferable that the resistance is Ω·m or less, and 1.0×10 -8 Ω m or more, 1.0×10 -4 It is more preferable that the volume resistivity R is Ω·m or less. When the volume resistivity R of the conductive linear members 22 is in the above range, the surface resistance of the pseudo sheet structure 20 tends to decrease. The volume resistivity R of the conductive linear body 22 is measured as follows. Silver paste is applied to both ends of the conductive linear body 22, and the resistance of a portion 40 mm long from the end is measured to determine the resistance value of the conductive linear body 22. Then, the cross-sectional area (unit: m 2 ) is multiplied by the resistance value, and the obtained value is divided by the measured length (0.04 m) to calculate the volume resistivity R of the conductive linear body 22.

[0040] The pseudo sheet structure 20 according to this embodiment is preferably used in a sensor that oscillates linearly polarized waves as electromagnetic waves. It is preferable that the conductive linear members 22 of the pseudo sheet structure 20 of this embodiment are arranged so that the longitudinal direction of the conductive linear members 22 is tilted in the range of 70° or more and 110° or less with respect to the polarization plane of the linearly polarized wave emitted from the sensor in which the pseudo sheet structure 20 is used.

[0041] The polarization plane is a plane that includes the direction in which the electric field of the linearly polarized component oscillates and the direction in which the linearly polarized component propagates, and Figure 2 shows a schematic plan view of the pseudo sheet structure 20 viewed along the direction in which the linearly polarized component propagates. For example, the longitudinal direction of the conductive linear members 22 of the quasi sheet structure 20 is arranged at an angle θ1 with respect to the polarization plane P1. Furthermore, for example, the longitudinal direction of the conductive linear members 22 of the quasi sheet structure 20 is arranged at an angle θ2 (specifically, 90°) with respect to the polarization plane P2. For example, the longitudinal direction of the conductive linear members 22 of the quasi sheet structure 20 is arranged at an angle θ3 with respect to the polarization plane P3.

[0042] The longitudinal direction of the conductive linear members 22 of the pseudo sheet structure 20 according to this embodiment is arranged at an angle of 70° or more and 110° or less with respect to the polarization plane of the linearly polarized wave emitted from the sensor, thereby suppressing the transmission of electromagnetic waves emitted from an oscillation source other than the sensor. Furthermore, since the interval L between the multiple conductive linear members 22 satisfies the relationship "L≦20 mm" in formula (1), the interval L between the conductive linear members 22 does not become too large, which suppresses temperature unevenness during heating and effectively acts to melt snow. That is, the pseudo sheet structure 20 according to this embodiment also functions as a filter for electromagnetic waves emitted from other oscillation sources (e.g., other sensors, etc.). As a result, the pseudo sheet structure 20 can suppress malfunction of the sensor due to electromagnetic waves emitted from other oscillation sources. Therefore, the pseudo sheet structure 20 according to this embodiment is suitably used as an electromagnetic wave filter that suppresses the transmission of electromagnetic waves emitted from an oscillation source other than a sensor, and also as a heating element.

[0043] In this embodiment, the conductive linear body 22 is not particularly limited as long as it satisfies the above formula (1). Examples of the conductive linear body 22 include 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 in which a conductive coating is applied to a thread, and a metal foil.

[0044] The conductive linear body 22 is preferably a metal wire linear body. Metal wire has high thermal conductivity, high electrical conductivity, easy handling, and versatility. Therefore, using a metal wire linear body as the conductive linear body 22 can reduce the resistance value of the pseudo sheet structure 20 while improving light transmittance. Furthermore, when the conductive linear body 22 is a metal wire linear body, rapid heat generation can be achieved when the sheet-like conductive member 1 or the pseudo sheet structure 20 is used as a heating element. Furthermore, as described above, using a metal wire linear body makes it easy to obtain a conductive linear body 22 with a narrow width D or diameter.

[0045] The conductive linear body 22 may be a linear body including a metal wire. The linear body including a metal wire may be a linear body made of a single metal wire, or may be a linear body made of multiple twisted metal wires. Examples of metal wires include wires containing metals such as copper, aluminum, tungsten, iron, molybdenum, nickel, titanium, silver, gold, palladium, rhodium, and platinum, or alloys containing two or more metals (e.g., steels such as stainless steel and carbon steel, brass, phosphor bronze, zirconium-copper alloys, beryllium copper, iron-nickel, nichrome, nickel-titanium, Kanthal, Hastelloy, and rhenium-tungsten). The metal wires may be plated with tin, zinc, silver, nickel, chromium, nickel-chromium alloys, solder, or the like, or may be surface-coated with a carbon material or polymer, as described below. Wires containing one or more metals selected from tungsten, molybdenum, and alloys containing these metals are particularly preferred from the viewpoint of providing a conductive linear body 22 with low volume resistivity.

[0046] The metal wire may be a metal wire coated with a carbon material. When the metal wire is coated with a carbon material, the metallic luster of the metal wire is reduced, making it easier to make the metal wire less noticeable. Furthermore, when the metal wire is coated with a carbon material, metal corrosion is also suppressed. Examples of carbon materials that can be used to coat the metal wire include amorphous carbon (such as carbon black, activated carbon, hard carbon, soft carbon, mesoporous carbon, and carbon fiber), graphite, fullerene, graphene, and carbon nanotubes.

[0047] It is also preferable that the conductive linear body 22 is a metal foil. The metal foil as the conductive linear body 22 can be obtained, for example, by processing the metal foil into a plurality of linear bodies arranged at intervals L by etching or the like. Alternatively, metal foils that have been processed into linear shapes in advance may be arranged at intervals L.

[0048] Carbon nanotube linear bodies can be obtained, for example, by drawing carbon nanotubes into a sheet from the end of a carbon nanotube forest (a growth in which multiple carbon nanotubes are grown on a substrate so as to be aligned perpendicular to the substrate; sometimes referred to as an "array"), bundling the drawn carbon nanotube sheets, and then twisting the bundles of carbon nanotubes. In this production method, if no twist is applied during twisting, ribbon-shaped carbon nanotube linear bodies are obtained, whereas if twist is applied, thread-shaped carbon nanotube linear bodies are obtained. Ribbon-shaped carbon nanotube linear bodies are linear bodies in which the carbon nanotubes do not have a twisted structure. Alternatively, carbon nanotube linear bodies can be obtained by spinning a carbon nanotube dispersion. Carbon nanotube linear bodies can be produced by spinning, for example, by the method disclosed in U.S. Patent Application Publication No. 2013 / 0251619 (Japanese Patent Application Laid-Open No. 2012-126635). From the viewpoint of obtaining uniformity in the diameter of the carbon nanotube linear bodies, it is desirable to use thread-like carbon nanotube linear bodies, and from the viewpoint of obtaining highly pure carbon nanotube linear bodies, it is preferable to obtain thread-like carbon nanotube linear bodies by twisting a carbon nanotube sheet. The carbon nanotube linear body may be a linear body formed by weaving two or more carbon nanotube linear bodies together. Furthermore, the carbon nanotube linear body may be a linear body formed by combining carbon nanotubes with other conductive materials (hereinafter also referred to as a "composite linear body").

[0049] Examples of composite linear bodies include: (i) a composite linear body in which a metal element or a metal alloy is supported on the surface of a carbon nanotube forest, sheet, or bundle, or twisted linear body by vapor deposition, ion plating, sputtering, wet plating, etc., during the process of obtaining a carbon nanotube linear body by drawing carbon nanotubes into a sheet form from the end of a carbon nanotube forest, bundling the drawn carbon nanotube sheet, and then twisting the carbon nanotube bundles; (ii) a composite linear body in which bundles of carbon nanotubes are twisted together with a metal element or a metal alloy linear body or composite linear body; and (iii) a composite linear body in which a metal element or a metal alloy linear body or composite linear body is braided with a carbon nanotube linear body or composite linear body. In the composite linear body of (ii), a metal may be supported on the carbon nanotubes when twisting the bundles of carbon nanotubes, as in the composite linear body of (i). The composite linear body of (iii) is a composite linear body in which two linear bodies are braided, but it may be a composite linear body in which three or more carbon nanotube linear bodies, or linear bodies of a metal or a metal alloy, or composite linear bodies are braided together, as long as it contains at least one linear body of a simple metal or a linear body of a metal alloy, or composite linear body. Examples of metals for the composite linear body include simple metals such as gold, silver, copper, iron, aluminum, nickel, chromium, tin, zinc, palladium, rhodium, and platinum, as well as alloys containing at least one of these simple metals (such as copper-nickel-phosphorus alloys and copper-iron-phosphorus-zinc alloys).

[0050] The conductive linear body 22 may be a linear body in which a conductive coating is applied to a thread. Examples of the thread include threads spun from resins such as nylon and polyester. Examples of the conductive coating include coatings of metals, conductive polymers, carbon materials, etc. The conductive coating can be formed by plating, vapor deposition, etc. A linear body in which a conductive coating is applied to a thread can improve the conductivity of the linear body while maintaining the flexibility of the thread. In other words, it becomes easier to reduce the resistance of the pseudo sheet structure 20.

[0051] (base material) In the sheet-shaped conductive member 1 according to this embodiment, the pseudo sheet structure 20 is preferably supported by the substrate 10 . The material of the substrate 10 is not particularly limited as long as it can support the pseudo sheet structure 20 . Examples of the substrate 10 include paper, thermoplastic resin films, cured films of curable resins, metal foils, nonwoven fabrics, woven fabrics, and glass films. Examples of the thermoplastic resin films include polyester-based, polycarbonate-based, polyimide-based, polyolefin-based, polyurethane-based, and acrylic-based resin films. The substrate 10 is also preferably in the form of a plate. From the viewpoint of imparting optical transparency to the sheet-shaped conductive member 1, the substrate 10 preferably has optical transparency.

[0052] (resin layer) In the sheet-like conductive member 1 according to this embodiment, the pseudo sheet structure 20 is preferably fixed to the substrate 10 by a resin layer 30. The resin layer 30 makes it easier to fix the pseudo sheet structure 20 to the surface of the substrate 10.

[0053] In the sheet-like conductive member 1 according to this embodiment, it is preferable that the conductive linear members 22 are contained in the resin layer 30 on the substrate 10. The conductive linear members 22 are not entirely embedded in the resin layer 30, but are exposed on the surface of the resin layer 30. By containing the conductive linear members 22 in the resin layer 30, displacement of the conductive linear members 22 can be suppressed. From the viewpoint of imparting optical transparency to the sheet-shaped conductive member 1, the resin layer 30 preferably has optical transparency.

[0054] The resin layer 30 contains a resin. The type of resin contained in the resin layer 30 is not particularly limited. The resin contained in the resin layer 30 may be a curable resin or a non-curable resin. The resin layer 30 preferably contains a curable resin. When the resin layer 30 contains a curable resin, the curing of the curable resin can impart sufficient hardness to the resin layer 30 to protect the pseudo sheet structure 20. Furthermore, the impact resistance of the cured resin layer 30 is improved, and deformation of the resin layer 30 due to impact can also be suppressed. The curable resin contained in the resin layer 30 is preferably a resin curable with energy rays such as ultraviolet rays, visible energy rays, infrared rays, or electron beams, since it can be easily cured in a short time. Note that "energy ray curing" also includes thermal curing by heating using energy rays. The resin layer 30 may contain one type of resin alone or two or more types of resins.

[0055] In the sheet-like conductive member 1 according to this embodiment, the resin layer 30 for fixing the pseudo sheet structure 20 to the substrate 10 preferably contains a cured product of a curable resin.

[0056] The resin layer 30 also preferably contains an adhesive as a resin component. Examples of the adhesive contained in the resin layer 30 include a so-called heat-seal type adhesive that bonds by heat, and an adhesive that develops adhesion when moistened. For ease of application to the sheet-like conductive member 1, the adhesive contained in the resin layer 30 is preferably a pressure-sensitive adhesive (a pressure-sensitive adhesive). The pressure-sensitive adhesive contained in the resin layer 30 is not particularly limited. Examples of the pressure-sensitive adhesive include acrylic pressure-sensitive adhesives, urethane pressure-sensitive adhesives, rubber pressure-sensitive adhesives, polyester pressure-sensitive adhesives, silicone pressure-sensitive adhesives, and polyvinyl ether pressure-sensitive adhesives. Among these, the pressure-sensitive adhesive is preferably at least one selected from the group consisting of acrylic pressure-sensitive adhesives, urethane pressure-sensitive adhesives, and rubber pressure-sensitive adhesives, and is more preferably an acrylic pressure-sensitive adhesive. The adhesive contained in the resin layer 30 is preferably a curable adhesive, and more preferably a curable pressure-sensitive adhesive (pressure-sensitive adhesive). Examples of curable adhesives include energy ray-curable adhesives, thermosetting adhesives, and natural curing adhesives. From the viewpoint of productivity, the adhesive contained in the resin layer 30 is preferably an energy ray-curable adhesive, as it cures in a short time. As the energy ray-curable adhesive, for example, a radical-curable adhesive is preferably used. Examples of the radical-curable adhesive include energy ray-curable adhesives such as electron beam-curable adhesives and ultraviolet ray-curable adhesives. In particular, an energy ray-curable adhesive that can be cured in a short time is preferred, and an ultraviolet ray-curable adhesive that can be cured with low energy is more preferred.

[0057] The resin layer 30 may contain an inorganic filler. By including an inorganic filler in the resin layer 30, the hardness of the resin layer 30 after curing can be further improved. The thermal conductivity of the resin layer 30 is also improved. Furthermore, when the adherend is mainly composed of glass, the linear expansion coefficients of the sheet-like conductive member 1 and the adherend can be made closer, thereby improving the reliability of the device obtained by attaching the sheet-like conductive member 1 to the adherend and curing it as necessary.

[0058] Examples of inorganic fillers include inorganic powders (such as silica, alumina, talc, calcium carbonate, titanium white, red iron oxide, silicon carbide, and boron nitride powders), beads obtained by spheroidizing inorganic powders, single-crystal fibers, and glass fibers. Among these, silica fillers and alumina fillers are preferred as inorganic fillers. One type of inorganic filler may be used alone, or two or more types may be used in combination.

[0059] The resin layer 30 may contain other components, such as well-known additives, such as organic solvents, flame retardants, tackifiers, ultraviolet absorbers, antioxidants, preservatives, antifungal agents, plasticizers, antifoaming agents, and wettability adjusters.

[0060] The thickness of the resin layer 30 is determined appropriately depending on the application of the sheet-shaped conductive member 1. For example, from the viewpoint of adhesiveness, 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.

[0061] (Method for manufacturing pseudo-sheet structure and sheet-like conductive member) The pseudo sheet structure and the sheet-like conductive member according to the present embodiment may be manufactured by any method, including the following steps: First, a laminate is prepared, including a substrate 10 and a resin layer 30 formed on the surface of the substrate 10. Next, conductive linear members 22 are arranged and placed on the surface of the resin layer 30 to form a pseudo-sheet structure 20. For example, with the resin layer 30 with the substrate 10 placed on the outer circumferential surface of a drum member, the drum member is rotated and the conductive linear members 22 are spirally wound around the surface of the resin layer 30. Then, the bundle of spirally wound conductive linear members 22 is cut along the axial direction of the drum member. This forms a pseudo-sheet structure 20, and the pseudo-sheet structure 20 is placed on the resin layer 30. The substrate 10 with the pseudo-sheet structure 20 placed on the resin layer 30 is then removed from the drum member. Through this process, a sheet-like conductive member 1 is obtained, including the substrate 10, the resin layer 30, and the pseudo-sheet structure 20. According to this method, for example, by rotating the drum member and moving the payout portion of the conductive linear body 22 along a direction parallel to the axis of the drum member, the spacing L between adjacent conductive linear bodies 22 in the pseudo sheet structure 20 can be easily adjusted to satisfy the above formula (1) or formula (2).

[0062] In another method for manufacturing the pseudo sheet structure according to this embodiment, the conductive linear members 22 are arranged at an interval L that satisfies the above formula (1) or (2) to manufacture the pseudo sheet structure 20. The manufactured pseudo sheet structure 20 can also be bonded to the resin layer 30 of a laminate having the substrate 10 and the resin layer 30 to manufacture the sheet-like conductive member 1.

[0063] (Characteristics of sheet-shaped conductive material and pseudo-sheet structure) ·Electromagnetic wave transmittance The electromagnetic wave transmittance of the pseudo sheet structure 20 of this embodiment in each band from 20 GHz or more to 110 GHz or less is preferably 60% or more, more preferably 70% or more to 100% or less, and even more preferably 80% or more to 100% or less. According to the pseudo sheet structure 20 having such electromagnetic wave transmittance, the electromagnetic waves emitted from the sensor can be transmitted more efficiently. The electromagnetic wave transmittance in the bands of 20 GHz or more and 110 GHz or less can be measured by the free-space S-parameter method using a vector network analyzer (Keysight "N5290A").

[0064] ·Light transmittance The light transmittance of the sheet-like conductive member 1 and pseudo sheet structure 20 in this embodiment is preferably 70% or more, more preferably 70% or more and 100% or less, and even more preferably 80% or more and 100% or less. If the light transmittance is 70% or more, when the sheet-like conductive member 1 or the pseudo-sheet structure 20 is attached to the surface of an adherend, the design of the appearance of the adherend can be prevented from being impaired. The light transmittance of the sheet-like conductive member 1 and the pseudo sheet structure 20 is determined by measuring the light transmittance in the visible range (380 nm or more and 760 nm or less) with a light transmittance meter, and taking the average value.

[0065] (How to use the sheet) The sheet-like conductive member 1 according to this embodiment is used, for example, by being attached to an adherend. When the resin layer 30 contains a curable resin, the sheet-like conductive member 1 is attached to the adherend, and then the resin layer 30 is cured. When attaching the sheet-like conductive member 1 to the adherend, the pseudo-sheet structure 20 side of the sheet-like conductive member 1 may be attached to the adherend (i.e., the sheet-like conductive member 1 may be attached to the adherend with the pseudo-sheet structure 20 interposed between the resin layer 30 and the adherend), or the substrate 10 side of the sheet-like conductive member 1 on which the resin layer 30 is not provided may be attached to the adherend. The pseudo sheet structure 20 side of the sheet-like conductive member 1 may be attached to an adherend, the resin layer 30 may be cured, and then the substrate 10 may be peeled off from the cured resin layer 30. Even when the substrate 10 is peeled off in this manner, the pseudo sheet structure 20 is sufficiently protected between the adherend and the cured resin layer 30, so that the impact resistance of the pseudo sheet structure 20 is maintained. Furthermore, when the sheet-shaped electrically conductive member 1 or the pseudo sheet structure 20 is used as a heating element, the resin layer 30 also contributes to preventing electric shock when heat is generated (when electricity is applied).

[0066] The sheet-like conductive member 1 or pseudo sheet structure 20 according to this embodiment can be suitably used as a snow melting heater in the radar section of a millimeter-wave radar. The sheet-like conductive member 1 or pseudo sheet structure 20 according to this embodiment is more preferably used in a millimeter-wave radar mounted on an automobile. Millimeter-wave radar detects a target using electromagnetic waves in the millimeter wave band (approximately 60 GHz to 80 GHz, for example, 76 GHz (wavelength 3.9 mm) or 79 GHz (wavelength 3.8 mm)). Water droplets and snow have high absorption properties, so if water droplets or snow adhere to the radar surface, it becomes difficult to detect the electromagnetic waves. In the sheet-like conductive member 1 or pseudo sheet structure 20 according to this embodiment, the conductive linear members 22 are arranged at appropriate intervals represented by formula (1) or formula (2), which is determined according to the frequency (or wavelength) of the electromagnetic wave emitted from the sensor. Therefore, the sheet-like conductive member 1 or pseudo sheet structure 20 according to this embodiment exhibits a heater function, making it possible to efficiently remove water droplets and snow, and furthermore, it is possible to efficiently transmit electromagnetic waves. In addition, the pseudo sheet structure of this embodiment is also easily permeable to electromagnetic waves in the frequency band used in fifth-generation mobile communication systems (e.g., 28 GHz (wavelength 10.7 mm) or 39 GHz (wavelength 7.7 mm)), and therefore can also be suitably used in sensors that emit electromagnetic waves in the 5G band.

[0067] It is also preferable to use the sheet-shaped conductive member 1 or the pseudo-sheet structure 20 as a heating element in a heating device 50. For example, a schematic plan view of the heating device 50 is shown in FIG. The heat generating device 50 has a heat generating element according to this embodiment (the sheet-shaped electrically conductive member 1 or pseudo sheet structure 20 according to this embodiment) and an electrode section 40 that supplies power to the pseudo sheet structure 20 of the heat generating element.

[0068] (electrode) The electrode section 40 is used to supply current to the conductive linear body 22. The electrode section 40 is disposed so as to be electrically connected to both ends of the conductive linear body 22. Even if the width D or diameter of the conductive linear body 22 is small, the electrode portion 40 is preferably strip-shaped because it can ensure a good contact area with the conductive linear body 22. The electrode portion 40 can be made of a conductive foil or plate.

[0069] Specific examples of the electrode unit 40 include foils or plates of metals such as gold, silver, copper, nickel, iron, aluminum, tungsten, molybdenum, palladium, rhodium, platinum, and titanium. Alternatively, the electrode unit 40 may be foils or plates of the above metals or other metals or alloys containing nonmetallic elements, such as stainless steel, carbon steel, brass, phosphor bronze, zirconium-copper alloy, beryllium copper, iron-nickel, nichrome, nickel-titanium, Kanthal, Hastelloy, and rhenium-tungsten. Alternatively, a strip containing a carbon material, such as carbon nanotubes, carbon nanofibers, or graphene, may be used. The electrode unit 40 may also be a laminate of a plastic film and a foil or plate of one of these metals, a foil or plate of these alloys, or a strip containing a carbon material.

[0070] Alternatively, the electrode unit 40 may be an electrode formed by solidifying a liquid conductive material (i.e., an electrode formed from a solidified liquid conductive material) from the viewpoint of ensuring a good connection between the conductive linear body 22 and the electrode unit 40. A typical example of a liquid conductive material is a 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 conductive paste. Examples of metal particles include particles of metals such as gold, silver, copper, and nickel. Examples of binder resins include well-known resins such as polyester resin, polyurethane resin, epoxy resin, and phenolic resin. As the liquid conductive material, other than the conductive paste, for example, solder, conductive ink, etc. may be used.

[0071] The electrode portion 40 may be a combination of a conductive foil or plate and a liquid conductive material. The liquid conductive material may be applied to the pseudo sheet structure 20 and then the conductive foil or plate may be attached, or the liquid conductive material may be applied to the pseudo sheet structure 20 after the conductive foil or plate with through holes is attached. By using a conductive foil or plate in combination with a liquid conductive material, the connection between the electrode portion 40 and the conductive linear body 22 becomes better. Alternatively, a plurality of conductive linear members 22 arranged closely together may be used as the electrode portion 40.

[0072] The resistance ratio between 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 resistance ratio between the electrode portion 40 and the pseudo sheet structure 20 can be calculated by "resistance value of electrode portion 40 / resistance value of pseudo sheet structure 20." When the resistance ratio between the electrode portion 40 and the pseudo sheet structure 20 is within this range, abnormal heat generation at the electrode portion is suppressed when the sheet-like conductive member 1 is used as a heating element. When the pseudo sheet structure 20 is used as a film heater, only the pseudo sheet structure 20 generates heat, resulting in a film heater with good heat generation efficiency. The resistance values ​​of the electrode portion 40 and the pseudo sheet structure 20 can be measured using a tester. First, the resistance value of the electrode portion 40 is measured, and then 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 portion 40 is attached.

[0073] 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 thickness of the electrode is within the above range, the electrical conductivity is high and the resistance is low, and the resistance value with the pseudo-sheet structure can be kept low. In addition, sufficient strength as an electrode can be obtained.

[0074] According to this embodiment, a pseudo sheet structure that efficiently transmits electromagnetic waves and has a heating function can be provided. Furthermore, according to this embodiment, a sheet-like conductive member having a pseudo sheet structure that efficiently transmits electromagnetic waves and has a heating function can be provided.

[0075] [Second embodiment] (sensor device) Next, a second embodiment of the present invention will be described. This embodiment relates to a sensor device. In the following explanation, differences from the first embodiment will be mainly explained, and overlapping explanations will be omitted or simplified. The same components as those in the first embodiment will be assigned the same reference numerals, and explanations will be omitted or simplified.

[0076] The sensor device according to this embodiment includes the pseudo sheet structure according to the above embodiment and a sensor that emits electromagnetic waves in a band of 20 GHz or more and 100 GHz or less.

[0077] Alternatively, the sensor device according to this embodiment includes the sheet-shaped conductive member according to the above embodiment and a sensor that oscillates electromagnetic waves in a band of 20 GHz or more and 100 GHz or less.

[0078] FIG. 4 shows a schematic cross-sectional view of the sensor device 100 according to this embodiment. The sensor device 100 according to this embodiment includes a sheet-shaped conductive member 1 and a sensor 110. The sensor device 100 according to this embodiment further includes a protective member 120. As shown in Fig. 4, the sheet-shaped conductive member 1 is preferably disposed between a sensor 110 and a protective member 120. In Fig. 4, the resin layer 30 side of the sheet-shaped conductive member 1 faces the protective member 120, and the substrate 10 side faces the sensor 110; however, the present invention is not limited to this arrangement. For example, the resin layer 30 side of the sheet-shaped conductive member 1 may face the sensor 110, and the substrate 10 side may face the protective member 120.

[0079] In the sensor device 100 of this embodiment, the spacing L of the conductive linear members 22 of the pseudo sheet structure 20 satisfies the above formula (1) which is defined according to the frequency of the electromagnetic waves oscillated by the sensor 110, and preferably satisfies formula (2).

[0080] In the sensor device 100 according to this embodiment, it is preferable that the width D of the conductive linear body 22 of the pseudo sheet structure 20 satisfies the formula (3) defined according to the frequency of the electromagnetic wave oscillated by the sensor 110.

[0081] The sensor 110 of the sensor device according to this embodiment is preferably a sensor that oscillates linearly polarized waves as electromagnetic waves. In the sensor device 100 according to this embodiment, the conductive linear members 22 of the pseudo sheet structure 20 are preferably arranged with their longitudinal directions tilted in the range of 70° to 110° with respect to the plane of polarization of the linearly polarized wave emitted from the sensor 110, and further, the pseudo sheet structure 20 is preferably fixed to the sensor 110 so as to satisfy this tilt range. The tilt range is more preferably 80° to 100°, and even more preferably 85° to 95°. In the sensor device 100 according to this embodiment, the longitudinal directions of the conductive linear bodies 22 are arranged with an inclination in the range of 70° or more and 110° or less with respect to the polarization plane of the linearly polarized wave emitted from the sensor 110, thereby suppressing the transmission of electromagnetic waves emitted from an oscillation source other than the sensor 110. Furthermore, since the interval L between the multiple conductive linear bodies 22 satisfies the relationship "L≦20 mm" in the above formula (1), the interval L between the conductive linear bodies 22 does not become too large, and the transmission of electromagnetic waves emitted from the other oscillation source can be suppressed. That is, when the inclination angle of the longitudinal direction of the conductive linear body 22 with respect to the polarization plane of the electromagnetic wave satisfies the above-mentioned range, the sensor device 100 according to this embodiment also has the function of blocking electromagnetic waves oscillated from other oscillation sources (e.g., other sensors, etc.). As a result, the sensor device 100 is less likely to cause malfunction of the sensor 110 due to electromagnetic waves coming from outside.

[0082] [Modification of the embodiment] The present invention is not limited to the above-described embodiment, and includes modifications and improvements within the scope of achieving the object of the present invention.

[0083] In the above embodiment, an example has been described in which the plurality of conductive linear members 22 are supported by the substrate 10, but the present invention is not limited to such an example. For example, a sheet-like conductive member may be used in which the plurality of conductive linear members 22 are supported by a resin layer 30. In this case, if the resin layer 30 has adhesive properties, the pseudo sheet structure 20 can be attached to an adherend via the resin layer 30.

[0084] In the above embodiment, an example was described in which the sheet-like conductive member 1 has the electrode portion 40, but the present invention is not limited to this. For example, the sheet-like conductive member 1 does not have to have the electrode portion 40. The electrode portion 40 may be provided in advance on an article to which the sheet-like conductive member is to be attached, and the sheet-like conductive member may be attached so that the pseudo sheet structure 20 contacts the electrode portion 40. [Example]

[0085] The present invention will be described in more detail below with reference to examples, but the present invention is not limited to these examples in any way.

[0086] [Example 1] An adhesive sheet was wrapped around a rubber drum. This adhesive sheet was a sheet (size: 120 mm x 120 mm) having an acrylic film (manufactured by Mitsubishi Chemical Corporation, "ACRYPLEN," thickness 75 μm) as a substrate and an adhesive layer (manufactured by Lintec Corporation, "PK," thickness 20 μm) laminated on the substrate. The adhesive sheet was wrapped around the rubber drum with the adhesive surface of the adhesive layer facing outward and without wrinkles. After wrapping, both ends of the adhesive sheet in the circumferential direction of the rubber drum were fixed with double-sided tape. A stainless steel conductive linear body (Tokusai Corporation, "SUS304", diameter D: 35 μm) wound around a bobbin was attached to the surface of an adhesive sheet located near the end of a rubber drum. The linear body was then unwound from the bobbin and wound around the rubber drum. When winding the linear body, the rubber drum was moved little by little in a direction parallel to the drum axis, and the linear body was wound around the rubber drum in a spiral at regular intervals. The adhesive sheet was cut parallel to the drum axis, along with the stainless steel linear members, to obtain a sheet-like conductive member in which a pseudo-sheet structure with an array of stainless steel linear members was laminated on the adhesive sheet. The diameter D and spacing L of the linear bodies of the pseudo-sheet structure were 35 μm and 0.130 mm, respectively. An acrylic film with electrodes was also prepared as an adherend by attaching a pair of copper tapes (10 mm wide, 130 mm long, 35 μm thick) to an acrylic film (75 μm thick, manufactured by Mitsubishi Chemical Corporation, "ACRYPLEN"). The sheet-like conductive member thus prepared was attached to an acrylic film with electrodes, and the copper tape serving as electrodes was electrically connected to both ends of the stainless steel linear body, thereby obtaining the heat generating device according to Example 1.

[0087] [Example 2] The heating device of Example 2 was fabricated in the same manner as Example 1, except that the conductive linear bodies were changed to tungsten conductive linear bodies (manufactured by Tokusai Corporation, "TWG-CS", diameter D: 14 ​​μm) and the spacing L between the conductive linear bodies was changed to 1.000 mm.

[0088] [Example 3] The heating device of Example 3 was fabricated in the same manner as Example 1, except that the conductive linear body was changed to a gold-plated stainless steel wire (manufactured by Tokusai Corporation, "SUS304-Aup", diameter D: 35 μm) and the spacing L of the conductive linear body was changed to 3,000 mm.

[0089] [Example 4] The heating device according to Example 4 was fabricated in the same manner as Example 2, except that the interval L between the tungsten linear bodies serving as the conductive linear bodies was changed to 3.000 mm.

[0090] [Example 5] The heating device of Example 5 was fabricated in the same manner as Example 1, except that the stainless steel conductive linear body was changed to a nickel wire (manufactured by Tokusai Corporation, "Ni wire", diameter D: 30 μm) and the spacing L of the conductive linear body was changed to 9 mm.

[0091] [Comparative Example 1] The heat generating device according to Comparative Example 1 was fabricated in the same manner as in Example 1, except that the interval L between the conductive linear bodies was changed to 0.100 mm.

[0092] Comparative Example 2 The heat generating device according to Comparative Example 2 was fabricated in the same manner as in Example 2, except that the interval L between the conductive linear bodies was changed to 25 mm.

[0093] [Transmittance measurement method] The fabricated heating device was measured for electromagnetic wave transmittance (S21) at the oscillation frequency of the sensor by a free-space S-parameter method using a vector network analyzer (Keysight Corporation, N5290A) in the bands of 20 GHz or higher and 110 GHz or lower, while varying the angle between the polarization plane and the conductive linear body as shown in Table 1. As shown in FIG. 5, this angle is the tilt angle θ2 of the longitudinal direction of the conductive linear body 22 with respect to the polarization plane P2 of the oscillated linearly polarized wave, and was measured by adjusting the tilt angle to the angle shown in Table 1. The electromagnetic wave transmittance was calculated in %. FIG. 5 is a schematic perspective view showing a state in which the conductive linear body 22 of the pseudo sheet structure 20 is arranged with the longitudinal angle θ2 of the conductive linear body 22 tilted at 90°. FIG. 6 is a graph showing the relationship between the longitudinal angle of the conductive linear body with respect to the polarization plane and electromagnetic wave transmittance for the heating devices of Example 1 and Comparative Example 1.

[0094] [Confirmation of heating efficiency, temperature rise test] Using a thin-film thermocouple (Geomatec Co., Ltd.'s "GMT-TC-SB7.5(P)"), the temperature rise ΔT near the center of the fabricated heating device was measured to be 0.1 W / cm when the device generated heat stably without temperature unevenness in the heating area. 2 The measurement was performed under the output condition of . The unit of temperature rise ΔT is K (Kelvin). If the temperature unevenness in the heat generation area is large, it is considered that the temperature unevenness is large.

[0095] [Table 1]

[0096] The pseudo sheet structures of the heating devices according to Examples 1 to 5 had multiple conductive linear members arranged at a spacing L that satisfied the formula (1), and therefore exhibited good electromagnetic wave transmittance and heating efficiency. The pseudo sheet structures according to Examples 1 to 5 efficiently transmitted electromagnetic waves and exhibited a heater function. The pseudo sheet structure of the heating device according to Comparative Example 1 had low electromagnetic wave transmittance because the conductive linear members were spaced closely together and at a large angle relative to the plane of polarization. The pseudo sheet structure of the heating device according to Comparative Example 2 was not fabricated with a linear member spacing L that satisfied the formula (1), and heating was uneven. This is thought to be because the spacing between the multiple conductive linear members in the pseudo sheet structure according to Comparative Example 2 was too wide. [Explanation of symbols]

[0097] 1...sheet-shaped conductive member, 10...substrate, 100...sensor device, 110...sensor, 20...pseudo sheet structure, 22...conductive linear body, 30...resin layer, 40...electrode portion, 50...heat generating device, D...width, L...spacing, P1...polarization plane, P2...polarization plane, P3...polarization plane.

Claims

1. A pseudo sheet structure used in a sensor that emits electromagnetic waves in a band of 20 GHz or more and 100 GHz or less, the pseudo sheet structure is made up of a plurality of conductive linear bodies arranged at intervals; the electromagnetic wave emitted from the sensor is a linearly polarized wave, the conductive linear bodies are arranged such that the longitudinal direction of the conductive linear bodies is inclined in a range of 70° or more and 110° or less with respect to the polarization plane of the linearly polarized wave, When the pseudo sheet structure is viewed from above, the width D of the conductive linear body is 5 μm or more and 40 μm or less, The distance L between the plurality of conductive linear bodies satisfies the following formula (1): The width D of the conductive linear body when the pseudo sheet structure is viewed in a plane satisfies the following formula (3): Pseudo seat structure. 0.034×λ Ｓ ≦L≦20mm …(1) D≦0.013×λS…(3) In the formula (1) and the formula (3), λ Ｓ is the wavelength of the electromagnetic wave emitted from the sensor, and L and λ Ｓ The unit is mm.

2. The pseudo sheet structure according to claim 1 , wherein the distance L between the plurality of conductive linear bodies satisfies the following formula (2): 0.034×λ Ｓ ≦L≦0.86×λ Ｓ …(2) In the above formula (2), λ Ｓ is the wavelength of the electromagnetic wave emitted from the sensor, and L and λ Ｓ The unit is mm.

3. The pseudo sheet structure is used as an electromagnetic wave filter that suppresses transmission of electromagnetic waves emitted from an oscillation source different from the sensor, and also as a heating element. The pseudo-seat structure according to claim 1 or 2.

4. The conductive linear body is a metal wire linear body, The cross section of the conductive linear body is circular, The width D of the conductive linear body corresponds to the diameter of the conductive linear body. The pseudo-seat structure according to any one of claims 1 to 3.

5. The pseudo seat structure according to any one of claims 1 to 4, A substrate supporting the pseudo-sheet structure. Sheet-shaped conductive material.

6. The sheet-shaped conductive member according to claim 5, The pseudo-sheet structure is fixed to the substrate by a resin layer. Sheet-shaped conductive material.

7. The sheet-shaped conductive member according to claim 6, The resin layer contains a cured product of a curable resin. Sheet-shaped conductive material.

8. The pseudo seat structure according to any one of claims 1 to 4, A sensor that emits electromagnetic waves in a band of 20 GHz or more and 100 GHz or less, Sensor device.

9. The sheet-shaped conductive member according to any one of claims 5 to 7, A sensor that emits electromagnetic waves in a band of 20 GHz or more and 100 GHz or less, Sensor device.

Images