Electromagnetic shielding window

Abstract

To provide an electromagnetic shield window and a method for manufacturing an electromagnetic shield window capable of improving shielding performance while securing visible light permeability.SOLUTION: An electromagnetic shield window includes a transparent base material that is non-conductive and transparent to visible light and has a groove recessed from the surface and extending in a mesh shape along the surface, and a transparent conductive material having an in-groove transparent conductive material provided in the groove over the extending direction of the groove and having conductivity and visible light transmittance.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present disclosure relates to an electromagnetic shield. window Regarding. [Background technology]

[0002] Patent Document 1 discloses a transparent body used as an electromagnetic interference shield. The transparent body includes, for example, a substrate and a conductive mesh printed on the substrate by inkjet printing. The conductive mesh suppresses the propagation of electromagnetic radiation through the transparent body. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent No. 6599963 Summary of the Invention [Problem to be solved by the invention]

[0004] However, in the cited document 1, since the conductive mesh is formed on the substrate by printing, it is difficult to increase the thickness of the conductive mesh, and therefore it is not possible to realize a shielding performance sufficient to protect electronic devices from electromagnetic pulses (EMP).

[0005] The present disclosure has been made to solve the above problems, and provides an electromagnetic shield that can improve shielding performance while ensuring transparency of visible light. window The purpose is to provide. [Means for solving the problem]

[0006] In order to solve the above problems, the electromagnetic shielding window according to the present disclosure includes a transparent substrate having a non-conductive property and a visible light transmissive property, the transparent substrate having a groove portion recessed from a surface and extending in a mesh-like manner along the surface, and a transparent conductive material having an in-groove transparent conductive material that is conductive and transmissive to visible light and is provided within the groove portion along an extension direction of the groove portion. The transparent conductive material further includes a surface transparent conductive material that is provided over the entire surface and has electrical conductivity and visible light transparency. . In addition, the electromagnetic shielding window according to the present disclosure comprises a transparent substrate having a groove portion recessed from a surface and extending in a mesh-like manner along the surface, a transparent conductive material provided within the groove portion along the extension direction of the groove portion, the transparent conductive material having an intra-groove transparent conductive material that is conductive and transmissive to visible light, and a transparent protective material that is non-conductive and has a visible light transmittance higher than that of the transparent conductive material, the transparent protective material being provided on the opposite side of the transparent substrate with the transparent conductive material sandwiched therebetween, the transparent protective material having an intra-groove transparent protective material disposed within the groove portion, the intra-groove transparent conductive material being provided so as to fill the space between the groove portion and the intra-groove transparent protective material. In addition, the electromagnetic shielding window according to the present disclosure comprises a transparent substrate having a non-conductive property and a visible light transmissive property, the transparent substrate having a groove portion recessed from a surface and extending in a mesh-like manner along the surface, and a transparent conductive material provided within the groove portion along the extension direction of the groove portion, the transparent conductive material having an intra-groove property and being conductive and transmissive to visible light, the groove portion penetrating the transparent substrate in the thickness direction. Effect of the Invention

[0008] Electromagnetic shielding of the present disclosure window According to this, it is possible to improve the shielding performance while ensuring the transmittance of visible light. [Brief description of the drawings]

[0009] [Figure 1] FIG. 2 is a perspective view of an electromagnetic shielding window according to the first embodiment of the present disclosure. [Diagram 2] 2 is a cross-sectional view of an electromagnetic shielding window according to a first embodiment of the present disclosure, taken along line II-II of FIG. [Diagram 3] 4 is a flowchart showing the steps of a method for manufacturing an electromagnetic shielding window according to the first embodiment of the present disclosure. [Figure 4] FIG. 2 is a cross-sectional view of the electromagnetic shielding window according to the first embodiment of the present disclosure, with the transparent conductive material removed. [Diagram 5] FIG. 2 is a cross-sectional view of the electromagnetic shielding window according to the first embodiment of the present disclosure, showing the state in which a transparent conductive material is filled in. [Figure 6] FIG. 4 is a cross-sectional view of an electromagnetic shielding window according to a second embodiment of the present disclosure. [Figure 7] FIG. 11 is a cross-sectional view of an electromagnetic shielding window according to a third embodiment of the present disclosure. [Figure 8] 10 is a flowchart showing the steps of a method for manufacturing an electromagnetic shielding window according to a third embodiment of the present disclosure. [Figure 9] FIG. 11 is a cross-sectional view of an electromagnetic shielding window according to a fourth embodiment of the present disclosure. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] [First embodiment] (Electromagnetic shielding window) Hereinafter, an electromagnetic shielding window 1 according to a first embodiment of the present disclosure and a method for manufacturing the electromagnetic shielding window 1 will be described with reference to FIGS.

[0011] As shown in Figs. 1 and 2, the electromagnetic shielding window 1 is used to shield electromagnetic radiation such as EMP. EMP is electromagnetic radiation having a wide frequency band, for example, from 1 kHz to 1.5 GHz. The electromagnetic shielding window 1 is attached to, for example, a metal housing (not shown). An electronic device (not shown) is placed inside the housing. The housing has a window frame (not shown) that opens to the outside. The electromagnetic shielding window 1 is attached to the window frame of the housing. In this case, the electromagnetic shielding window 1 is used to protect the electronic device from electromagnetic radiation outside the housing. The electromagnetic shielding window 1 includes a transparent substrate 10 and a transparent conductive material 20.

[0012] (Transparent base material) The transparent substrate 10 is a plate-like member having a uniform thickness. The transparent substrate 10 is made of polycarbonate. Therefore, the transparent substrate 10 is non-conductive and transparent to visible light. Hereinafter, the thickness direction of the transparent substrate 10 may be simply referred to as the "thickness direction." The transparent substrate 10 has a first surface 11 (front surface), a second surface 12, and a groove portion 13.

[0013] (Side 1) The first surface 11 is a flat surface of the surface of the transparent base material 10 that is perpendicular to the thickness direction of the transparent base material 10 .

[0014] (2nd page) The second surface 12 is a surface of the transparent substrate 10 that is located on the opposite side in the thickness direction to the first surface 11. The second surface 12 is a flat surface that is perpendicular to the thickness direction.

[0015] (Groove) The groove portion 13 is provided on the first surface 11. The groove portion 13 is formed so as to be recessed from the first surface 11 of the transparent substrate 10. The groove portion 13 extends in a mesh shape along the first surface 11. Specifically, the groove portion 13 is formed in a honeycomb shape in which a plurality of regular hexagons of the same size are combined in a plan view.

[0016] Hereinafter, in the first embodiment, the distance between two opposing sides of one regular hexagon constituting groove portion 13 is defined as the opening dimension of groove portion 13. From the viewpoint of shielding performance, it is desirable that dimension g of the opening dimension be equal to or less than half the wavelength of the electromagnetic radiation shielded by electromagnetic shield window 1. Specifically, it is desirable that dimension g be equal to or less than 15 mm, for example. From the viewpoint of ease of processing, it is desirable that dimension g be equal to or more than 0.5 mm, for example.

[0017] The groove portion 13 is formed in a U-shape that opens in the thickness direction in a cross-sectional view. The depth dimension d of the groove portion 13 is constant throughout the electromagnetic shielding window 1. From the viewpoint of shielding performance, it is desirable that d / g is 1 or greater. The width dimension w of the groove portion 13 is constant throughout the electromagnetic shielding window 1. From the viewpoint of shielding performance, the larger the dimension w, the better the performance, but taking into consideration the transmittance of visible light, it is desirable that the dimension w be, for example, from 100 [μm] to 1000 [μm].

[0018] The groove portion 13 has a pair of inner circumferential surfaces 14 and a bottom surface 15. The pair of inner circumferential surfaces 14 are surfaces along the thickness direction and face each other in a direction perpendicular to the thickness direction. The bottom surface 15 is a surface along the first surface 11 and the second surface 12 and connects the lower ends of the pair of inner circumferential surfaces 14 to each other.

[0019] (Transparent conductive material) The transparent conductive material 20 is provided on the first surface 11 side of the transparent substrate 10. The transparent conductive material 20 of the first embodiment is formed from silver nanoink of paint I (precursor material) (see FIG. 5 ) described below. Therefore, the transparent conductive material 20 has electrical conductivity and visible light transparency. From the viewpoint of shielding performance, the electrical conductivity of the transparent conductive material 20 is 1.0×10 5 The transparent substrate 10 has a visible light transmittance higher than that of the transparent conductive material 20. The transparent conductive material 20 has transparent conductive material 21 in its grooves.

[0020] (Transparent Conductive in Groove) The intra-groove transparent conductive material 21 is provided in the groove portion 13 over the extension direction of the groove portion 13. The intra-groove transparent conductive material 21 fills the entire area of ​​the groove portion 13. Therefore, the shape of the intra-groove transparent conductive material 21 is the same as the shape of the groove portion 13, and each dimension of the intra-groove transparent conductive material 21 is equal to each dimension of the groove portion 13. Specifically, the thickness dimension of the intra-groove transparent conductive material 21 is dimension d, and the width dimension of the intra-groove transparent conductive material 21 is dimension w. In addition, if the distance between two opposing sides of one regular hexagon constituting the intra-groove transparent conductive material 21 is taken as the opening dimension of the intra-groove transparent conductive material 21, the opening dimension of the intra-groove transparent conductive material 21 is dimension g. The exposed surface of the in-groove transparent conductive material 21 exists along the first surface 11. The exposed surface of the in-groove transparent conductive material 21 is a flat surface that is flush with the first surface 11.

[0021] (Manufacturing method of electromagnetic shielding window) Next, a manufacturing method of the electromagnetic shielding window 1 will be described with reference to the flowchart shown in Fig. 3. The manufacturing method of the electromagnetic shielding window 1 includes at least a groove forming step S1, an application step S2, and a curing step S4. The manufacturing method of the electromagnetic shielding window 1 of the first embodiment further includes a leveling step S3 between the application step S2 and the curing step S4.

[0022] The groove forming step S1 is carried out simultaneously when molding the entire transparent base material 10. Specifically, the groove 13 as shown in Fig. 4 is formed by a mold when the entire transparent base material 10 is resin molded.

[0023] The coating step S2 is performed after the groove forming step S1. As shown in Fig. 5, in the coating step S2, paint I is applied to the inside of the groove 13 using a spray. The paint I in the first embodiment is silver nano-ink. The paint I has fluidity.

[0024] The application step S2 is followed by a leveling step S3. As shown in Fig. 2, in the leveling step S3, the paint I is leveled to such an extent that the paint I slightly protrudes from the first surface 11. The leveling step S3 may be omitted. The hardening step S4 is carried out after the smoothing step S3. In the hardening step S4, the transparent substrate 10 to which the coating material I has been applied is left to harden naturally. As a result, the coating material I becomes the transparent conductive material 20. As a finishing touch, the portion of the transparent conductive material 20 that protrudes beyond the first surface 11 in the thickness direction is polished and scraped off. As a result, the exposed surface of the transparent conductive material 20 becomes a flat surface flush with the first surface 11 of the transparent substrate 10. Note that if the exposed surface of the transparent conductive material 20 becomes a flat surface flush with the first surface 11 when the coating material I hardens, the step of scraping off the transparent conductive material 20 may be omitted. In this manner, the production of the electromagnetic shielding window 1 is completed.

[0025] In addition, in the coating step S2, the coating material I may be applied not only to the grooves 13 but also to the first surface 11, and after the resin has hardened, the coating material I on the first surface may be scraped off to expose the first surface 11.

[0026] The manufactured electromagnetic shield window 1 is attached to a metal housing (not shown) via a transparent conductive material 20.

[0027] (Action and effect) In the electromagnetic shielding window 1 having the above configuration, both the transparent substrate 10 and the transparent conductive material 20 have visible light transparency, so that the electromagnetic shielding window 1 as a whole can ensure visible light transparency. In addition, since the transparent conductive material 20 is provided in the groove portion 13, the thickness of the transparent conductive material 20 can be made larger than when the transparent conductive material 20 is provided on the surface of the transparent substrate 10, for example. This ensures sufficient shielding performance to shield electromagnetic radiation having a wide frequency band such as EMP and to protect electronic devices. This sufficient shielding performance is, for example, a shielding performance of 80 dB or more. Therefore, according to the electromagnetic shielding window 1 of the first embodiment, it is possible to improve the shielding performance while ensuring the transmittance of visible light.

[0028] In the electromagnetic shielding window 1 having the above configuration, the dimension w is, for example, within a range of 100 μm to 1000 μm. This allows the electromagnetic shielding window 1 to have sufficient visible light transmittance to ensure sufficient visibility through the electromagnetic shielding window 1.

[0029] The electromagnetic shielding window 1 having the above configuration is attached to a metal housing (not shown) via the transparent conductive material 20. This makes it easier to connect the electromagnetic shielding window 1 to the housing compared to a case in which the electromagnetic shielding window 1 is attached to the housing via the transparent base material 10.

[0030] In the method for manufacturing the electromagnetic shielding window 1 having the above configuration, the transparent conductive material 20 is formed by applying the paint I inside the groove portion 13. This makes it easier to achieve a larger area and lower costs than when the transparent conductive material 20 is formed by lithography, sputtering, or the like. Therefore, according to the manufacturing method of the electromagnetic shielding window 1 of the first embodiment, the electromagnetic shielding window 1 described above can be easily obtained.

[0031] [Second embodiment] An electromagnetic shielding window 1 according to a second embodiment of the present disclosure will now be described with reference to Fig. 6. In the second embodiment, the configuration of the transparent conductive material 20 provided in the electromagnetic shielding window 1 of the first embodiment is partially different. The transparent conductive material 20 of the second embodiment includes a surface transparent conductive material 22 provided over the entire first surface 11, in addition to an in-groove transparent conductive material 21. The same components as in the first embodiment are denoted by the same reference numerals, and detailed description thereof will be omitted.

[0032] (Transparent base material) The grooves 13 of the second embodiment shown in FIG. 6 are shallower than the grooves 13 of the first embodiment. (Transparent conductive material) The overall thickness dimension of the transparent conductive material 20 in the second embodiment is equal to the thickness dimension d of the in-groove transparent conductive material 21 in the first embodiment.

[0033] (Surface transparent conductive material) The surface transparent conductive material 22 is integrally formed at the end of the inner-groove transparent conductive material 21 on the first surface 11 side in the thickness direction. The material of the surface transparent conductive material 22 is the same as the material of the inner-groove transparent conductive material 21. The surface transparent conductive material 22 is formed in a plate shape with a uniform thickness. The thickness direction of the surface transparent conductive material 22 coincides with the thickness direction of the transparent substrate 10. The surface transparent conductive material 22 is thinner than the transparent substrate 10 and the inner-groove transparent conductive material 21. The surface transparent conductive material 22 is bonded to the first surface 11 of the transparent substrate 10. The exposed surface of the surface of the surface transparent conductive material 22 opposite in the thickness direction to the surface bonded to the first surface 11 is a flat surface.

[0034] The in-groove transparent conductive material 21 of the second embodiment is formed thinner than the in-groove transparent conductive material 21 of the first embodiment by the thickness of the surface transparent conductive material 22 . The transparent conductive material 20 of the second embodiment is formed by applying the paint I not only to the inside of the grooves 13 but also to the first surface 11 in the application step S2.

[0035] (Action and effect) In the electromagnetic shielding window 1 having the above-mentioned configuration, the surface transparent conductive material 22 is provided on the surface of the transparent base material 10, so that the shielding performance can be further improved. Furthermore, the contribution of the surface transparent conductive material 22 to the shielding performance makes it possible to ensure the necessary shielding performance even if the thickness of the intra-groove transparent conductive material 21 is reduced. Here, if the thickness of the intra-groove transparent conductive material 21 is carelessly increased, the transmittance of visible light, particularly light that is incident obliquely with respect to the normal to the first surface 11 of the electromagnetic shielding window 1, is hindered, resulting in a loss of transmittance for the electromagnetic shielding window 1 as a whole. In contrast, with the above configuration, the thickness of the intra-groove transparent conductive material 21 can be reduced, thereby preventing the transmittance from being impaired.

[0036] [Third embodiment] An electromagnetic shielding window 1 according to a third embodiment of the present disclosure will now be described with reference to Figures 7 and 8. Unlike the electromagnetic shielding window 1 according to the first and second embodiments, the electromagnetic shielding window 1 of the third embodiment further includes a transparent protective material 30. The same components as those in the first and second embodiments are denoted by the same reference numerals, and detailed descriptions thereof will be omitted.

[0037] (Transparent protective material) As shown in FIG. 7 , the transparent protective material 30 is provided on the first surface 11 side of the transparent substrate 10 in the thickness direction, separated from the transparent substrate 10. The transparent protective material 30 is formed of the same material as the transparent substrate 10 (e.g., polycarbonate). Therefore, the transparent protective material 30 is non-conductive and transparent to visible light. The visible light transmittance of the transparent protective material 30 is higher than the visible light transmittance of the transparent conductive material 20. The transparent protective material 30 includes an in-groove transparent protective material 31 and a surface transparent protective material 32.

[0038] (Transparent protective material inside the groove) The intra-groove transparent protective material 31 is provided within the groove portion 13 in the extension direction of the groove portion 13. Therefore, the intra-groove transparent protective material 31 is formed in a honeycomb shape similar to that of the groove portion 13 in a plan view. The width of the intra-groove transparent protective material 31 is smaller than the width of the groove portion 13. The surface of the intra-groove transparent protective material 31 is spaced apart from the inner circumferential surface 14 and the bottom surface 15 of the groove portion 13.

[0039] (Surface transparent protective material) The surface transparent protective material 32 is integrally formed at the end of the in-groove transparent protective material 31 on the first surface 11 side in the thickness direction. The surface transparent protective material 32 is formed in a plate shape with a uniform thickness. The thickness direction of the surface transparent protective material 32 coincides with the thickness direction of the transparent substrate 10. The surface transparent protective material 32 is thinner than the transparent substrate 10. The surface transparent protective material 32 is spaced apart from the first surface 11 of the transparent substrate 10 in the thickness direction. The surface transparent protective material 32 is provided so as to follow the first surface 11. The exposed surface of the surface of the surface transparent protective material 32 opposite in the thickness direction to the surface facing the first surface 11 is a flat surface.

[0040] (Transparent conductive material) The transparent conductive material 20 is provided so as to fill the gap between the transparent substrate 10 and the transparent protective material 30. Specifically, the intra-groove transparent conductive material 21 is provided so as to fill the gap between the groove portion 13 and the intra-groove transparent protective material 31, and the surface transparent conductive material 22 is provided so as to fill the gap between the first surface 11 and the surface transparent protective material 32. In other words, the transparent protective material 30 is provided on the opposite side of the transparent conductive material 20 to the transparent substrate 10. The transparent conductive material 20 bonds the transparent base material 10 and the transparent protective material 30 together without any gaps.

[0041] (Manufacturing method of electromagnetic shielding window) Next, a manufacturing method for the electromagnetic shielding window 1 will be described with reference to the flowchart shown in Fig. 8. The manufacturing method for the electromagnetic shielding window 1 of the third embodiment further includes a protective material arrangement step S3a and a pressure and heat molding step S3b between the application step S2 and the curing step S4, instead of the smoothing step S3 of the first embodiment.

[0042] After the coating step S2, a protective material arranging step S3a is performed. In the protective material arranging step S3a, the transparent protective material 30 is arranged on the transparent substrate 10 to which the coating material I has been applied, so that the in-groove transparent protective material 31 is inserted into the groove portion 13. As a result, the coating material I is arranged so as to be filled between the transparent substrate 10 and the transparent protective material 30.

[0043] After the protective material arrangement step S3a, a pressure and heat molding step S3b is performed. In the pressure and heat molding step S3b, the transparent base material 10, the coating material I, and the transparent protective material 30 are tightly adhered to each other by pressure and heat in the thickness direction. Thereafter, a hardening step S4 is performed, and the manufacturing method of the electromagnetic shielding window 1 is completed.

[0044] (Action and effect) In the electromagnetic shielding window 1 configured as above, the shielding performance can be improved by thickening the portion of the transparent conductive material 20 along the inner circumferential surface 14 of the groove portion 13. In addition, since the transparent protective material 30 has a higher visible light transmittance than the transparent conductive material 20, the visible light transmittance of the electromagnetic shielding window 1 as a whole can be sufficiently ensured.

[0045] In the electromagnetic shielding window 1 having the above configuration, the transparent conductive material 20 bonds the transparent base material 10 and the transparent protective material 30 without any gaps. This makes it possible to suppress diffuse reflection of visible light at the interface between the transparent base material 10 and the transparent conductive material 20 and the interface between the transparent conductive material 20 and the transparent protective material 30. This makes it possible to improve the transmittance of visible light.

[0046] [Fourth embodiment] An electromagnetic shielding window 1 according to a fourth embodiment of the present disclosure will now be described with reference to Fig. 9. In the fourth embodiment, the configuration of the transparent base material 10 provided in the electromagnetic shielding window 1 of the first embodiment is partially different. In the transparent base material 10 of the fourth embodiment, a groove portion 13 penetrates the transparent base material 10 in the thickness direction. The same components as in the first embodiment are denoted by the same reference numerals, and detailed description thereof will be omitted.

[0047] (Transparent base material) As shown in FIG. 9, the grooves 13 are open not only on the first surface 11 side of the transparent substrate 10 but also on the second surface 12 side.

[0048] (Transparent conductive material in groove) The in-groove transparent conductive material 21 is exposed not only on the first surface 11 side but also on the second surface 12 side. The exposed surface of the in-groove transparent conductive material 21 on the second surface 12 side is aligned along the second surface 12. The exposed surface of the in-groove transparent conductive material 21 on the second surface 12 side is a flat surface that is flush with the second surface 12.

[0049] (Action and effect) In the electromagnetic shielding window 1 having the above configuration, the manufacturer of the electromagnetic shielding window 1 can easily form the groove 13, compared to a case in which the groove 13 is formed in a recessed shape that does not penetrate the transparent base material 10 in the thickness direction. Therefore, the electromagnetic shielding window 1 can be easily obtained.

[0050] [Other embodiments] Although the embodiments of the present disclosure have been described in detail above with reference to the drawings, the specific configurations are not limited to these embodiments, and also include design modifications and the like that do not deviate from the gist of the present disclosure.

[0051] In the above embodiments, the groove portion 13 is formed in a honeycomb shape in which a plurality of identical regular hexagons are combined in a plan view, but this is not limited thereto. The transparent substrate 10 may be formed in a mesh shape. For example, the groove portion 13 may be formed in a shape in which a plurality of identical polygons other than a regular hexagon, such as an equilateral triangle, a square, or a regular pentagon, are combined in a plan view. When the unit shape of the groove portion 13 is an equilateral triangle, the opening dimension of the groove portion 13 is the height dimension of the equilateral triangle. When the unit shape of the groove portion 13 is a square, the opening dimension of the groove portion 13 is the length dimension of the diagonal line of the square. The groove portion 13 does not have to be formed in a shape in which a plurality of identical regular polygons are combined.

[0052] In the above embodiments, the transparent base material 10 is made of polycarbonate, but is not limited to this. The transparent base material 10 may be made of a resin material such as PET (Polyethylene Terephthalate) or epoxy resin, glass, or a composite material thereof.

[0053] In the above embodiments, the transparent conductive material 20 is formed of silver nano-ink, but the present invention is not limited to this. The transparent conductive material 20 may be formed of a transparent conductive material such as PEDOT (Polyethylenedioxythiophene) or a CNT (Carbon Nanotube) dispersion liquid.

[0054] In the third embodiment, the transparent protective material 30 is formed of the same material as the transparent base material 10, but this is not limited thereto. The transparent protective material 30 may be formed of a material different from that of the transparent base material 10.

[0055] In the above-described embodiments, the grooves 13 are formed by a mold when the entire transparent substrate 10 is resin-molded, but the present invention is not limited to this. The grooves 13 may be formed, for example, by irradiating the first surface 11 with a laser beam.

[0056] In the above embodiments, the paint I is applied to the transparent base material 10 using a spray, but the present invention is not limited to this and the paint I may be applied by a method such as bar coating.

[0057] <Additional Notes> The electromagnetic shielding window 1 described in each embodiment can be understood, for example, as follows.

[0058] (1) The electromagnetic shielding window 1 of the first embodiment comprises a transparent substrate 10 which is non-conductive and transparent to visible light, and has grooves 13 recessed from a surface (first surface 11) and extending in a mesh-like pattern along the surface, and a transparent conductive material 20 which is provided within the grooves 13 in the direction in which the grooves 13 extend, and which has intra-groove transparent conductive material 21 which is conductive and transparent to visible light.

[0059] According to the above configuration, both the transparent base material 10 and the transparent conductive material 20 have visible light transparency, and therefore it is possible to ensure the visible light transparency of the entire electromagnetic shielding window 1. Furthermore, since the transparent conductive material 20 is provided within the groove portion 13, the thickness of the transparent conductive material 20 can be made greater than when the transparent conductive material 20 is provided on the surface of the transparent base material 10, for example.

[0060] (2) The electromagnetic shielding window 1 of the second aspect is the electromagnetic shielding window 1 of (1), wherein the transparent conductive material 20 is provided over the entire surface and may further include a surface transparent conductive material 22 that is conductive and transparent to visible light.

[0061] According to the above-mentioned configuration, since the surface transparent conductive material 22 is provided on the surface of the transparent base material 10, the shielding performance can be further improved.

[0062] (3) The electromagnetic shielding window 1 of a third embodiment is the electromagnetic shielding window 1 of (1) or (2), further comprising a transparent protective material 30 which is non-conductive and has a visible light transmittance higher than that of the transparent conductive material 20, and is provided on the opposite side of the transparent substrate 10 across the transparent conductive material 20, and the transparent protective material 30 has an intra-groove transparent protective material 31 which is disposed within the groove portion 13, and the intra-groove transparent conductive material 21 may be provided so as to fill the space between the groove portion 13 and the intra-groove transparent protective material 31.

[0063] According to the above configuration, it is possible to improve the shielding performance by thickening the portion of the transparent conductive material 20 along the inner circumferential surface 14 of the groove portion 13. In addition, since the transparent protective material 30 has a higher visible light transmittance than the transparent conductive material 20, it is possible to sufficiently ensure the visible light transmittance of the electromagnetic shielding window 1 as a whole.

[0064] (4) The electromagnetic shielding window 1 of a fourth aspect is the electromagnetic shielding window 1 of any one of (1) to (3), wherein the groove portion 13 may penetrate the transparent base material 10 in the thickness direction.

[0065] According to the above configuration, the manufacturer of the electromagnetic shielding window 1 can form the groove 13 more easily than when the groove 13 is formed in a recessed shape that does not penetrate the transparent base material 10 in the thickness direction.

[0066] (5) A manufacturing method of an electromagnetic shielding window 1 of a fifth aspect is a manufacturing method of an electromagnetic shielding window 1 of any of (1) to (4), and includes a groove forming step S1 of forming grooves 13 on the surface of a transparent substrate 10 that is non-conductive and transmissive to visible light, the grooves 13 being recessed from the surface and extending in a mesh-like pattern along the surface, an application step S2 of applying a precursor material (paint I) having flowability into the grooves 13, and a curing step S4 of curing the precursor material applied into the grooves 13 to form a transparent conductive material 20 having an in-groove transparent conductive material 21 that is conductive and transmissive to visible light and is provided within the grooves 13 along the extension direction of the grooves 13.

[0067] This makes it possible to easily obtain the electromagnetic shielding window 1 described above. [Explanation of symbols]

[0068] 1...Electromagnetic shield window 10...Transparent base material 11...First surface (front) 12...Second surface 13...Groove portion 14...Inner peripheral surface 15...Bottom surface 20...Transparent conductive material 21...Transparent conductive material in the groove 22...Surface transparent conductive material 30...Transparent protective material 31...Transparent protective material in the groove 32...Surface transparent protective material S1...Groove formation process S2...Coating process S3...Breaking-in process S3a...Protective material placement process S3b...Pressure / heat molding process S4...Curing process I...Paint (precursor material)

Claims

1. A transparent substrate having non-conductivity and visible light transmissibility, the transparent substrate having grooves recessed from a surface and extending in a mesh-like pattern along the surface; a transparent conductive material provided in the groove along an extension direction of the groove, the transparent conductive material having an in-groove transparent conductive material having electrical conductivity and visible light transparency; The transparent conductive material is The electromagnetic shielding window further comprises a surface transparent conductive material provided over the entire surface, the surface transparent conductive material having electrical conductivity and visible light transparency.

2. A transparent substrate having non-conductivity and visible light transmissibility, the transparent substrate having grooves recessed from a surface and extending in a mesh-like pattern along the surface; a transparent conductive material including an in-groove transparent conductive material provided in the groove along an extension direction of the groove and having electrical conductivity and visible light transmissivity; a transparent protective material that is non-conductive and has a visible light transmittance higher than that of the transparent conductive material, and is provided on the opposite side of the transparent base material with the transparent conductive material interposed therebetween; The transparent protective material includes an in-groove transparent protective material disposed in the groove portion, The groove-inside transparent conductive material is an electromagnetic shield window provided so as to fill the gap between the groove portion and the groove-inside transparent protective material.

3. A transparent substrate having non-conductivity and visible light transmissibility, the transparent substrate having grooves recessed from a surface and extending in a mesh-like pattern along the surface; a transparent conductive material provided in the groove along an extension direction of the groove, the transparent conductive material having an in-groove transparent conductive material having electrical conductivity and visible light transparency; The groove portion is an electromagnetic shielding window that penetrates the transparent base material in the thickness direction.

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