Double-glazed panel

Abstract

To provide a double layer glass panel capable of obtaining radio wave transmissibility while having sufficient thermal insulation properties.SOLUTION: A double layer glass panel includes a first glass plate 1, a second glass plate 2 arranged to face the first glass plate 1 and a spacer 5 arranged between the first glass plate 1 and the second glass plate 2 and forming an air space layer 3 between the first glass plate 1 and the second glass plate 2. A plate surface 12 of at least one of the first glass plate 1 and the second glass plate 2 has a coating region 42 having a Low-E film 41 and an exposure region 43 without having the Low-E film 41.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a double glazing panel. [Background technology]

[0002] As a window glass, there exists a double-glazed glass panel having a first glass plate and a second glass plate, with a Low-E film (low-emissivity film) that reflects infrared rays formed on one of the surfaces of the first glass plate and the second glass plate (for example, Patent Document 1). By using such a multiple glass panel, the heat insulating properties of the window glass can be improved. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2006-143525 Summary of the Invention [Problem to be solved by the invention]

[0004] However, double-glazed glass panels coated with a Low-E film (low-emission film) have low radio wave permeability, making it difficult to transmit and receive radio waves, for example, for mobile phones.

[0005] In view of the above circumstances, there is a demand for a double-glazing panel that can ensure radio wave transmission while having sufficient heat insulation properties. [Means for solving the problem]

[0006] A characteristic configuration of a double-glazed glass panel according to the present invention comprises a first glass plate, a second glass plate disposed opposite the first glass plate, and a spacer disposed between the first glass plate and the second glass plate to form an air gap layer between the first glass plate and the second glass plate, wherein a plate surface of at least one of the first glass plate or the second glass plate has a coated region where a Low-E film is formed and an exposed region where the Low-E film is not formed, the exposed region being rectangular, and the distance between an outer edge of the exposed region and an outer edge of the plate surface having the Low-E film is within 15 cm. When viewed from a direction perpendicular to the first glass plate and the second glass plate, an antenna is provided at a position overlapping with a corresponding area of ​​either the first glass plate or the second glass plate, the exposed area being configured to allow passage of radio waves corresponding to ultra-high frequencies (3 to 30 GHz, 100 mm to 10 mm), and the distance from the lower end of the corresponding area to the antenna is 10 mm or more. It's at the point.

[0007] According to this configuration, the double-glazing panel has a coated area on at least one of the first and second glass sheets, where a Low-E film is formed, and an exposed area where no Low-E film is formed. Therefore, the double-glazing panel can ensure thermal insulation through the coated area where the Low-E film is formed. Furthermore, the double-glazing panel can ensure radio wave transparency through the exposed area where no Low-E film is formed. This allows, for example, an antenna placed on the indoor side to transmit and receive radio waves to and from the outdoor side via the exposed area.

[0008] The exposed region can be formed by removing the Low-E film from the surface of the glass plate on which the Low-E film is formed or by using various masking materials, and therefore can be easily positioned at a desired position on the glass plate.

[0009] As another characteristic configuration, when the first glass plate is on the outdoor side and the plate surface of the first glass plate opposite the air gap layer is defined as the first surface, the plate surface of the first glass plate facing the air gap layer is defined as the second surface, the plate surface of the second glass plate facing the air gap layer is defined as the third surface, and the plate surface of the second glass plate opposite the air gap layer is defined as the fourth surface, it is preferable that the coated region and the exposed region are arranged on the second surface of the first glass plate or the third surface of the second glass plate.

[0010] According to this configuration, the Low-E film is disposed on the side of the first or second glass sheet facing the air gap layer. This allows heat to be blocked in the coating area where the Low-E film is formed, with the air gap layer acting as a boundary. As a result, the heat insulation performance of the double-glazed panel can be improved.

[0011] As another characteristic configuration, it is preferable that the Low-E film is disposed on the second surface of the first glass plate, and a heat-shielding film is disposed on the first surface of the first glass plate, or the third surface of the second glass plate, or the fourth surface of the second glass plate.

[0012] According to this configuration, a Low-E film is disposed on the second surface of the first glass sheet, and a heat-shielding film is disposed on the other surface of the first glass sheet or the second glass sheet. This allows the double-glazing panel to block infrared rays contained in sunlight using the heat-shielding film, thereby imparting heat-shielding properties to the entire surface of the double-glazing panel. In other words, the heat-shielding film ensures heat-shielding properties even in exposed areas where no Low-E film is formed.

[0013] As another characteristic configuration, it is preferable that the Low-E film is disposed on the third surface of the second glass plate, and a heat-shielding film is disposed on the second surface of the first glass plate.

[0014] Most low-E films reflect and block infrared rays, while most heat-shielding films absorb and block infrared rays. Therefore, heat-shielding films easily transfer heat to adjacent glass panes. For this reason, if a heat-shielding film is placed on the third surface of the second glass pane, the second glass pane will be heated by the heat-shielding film, making it easier for the room to warm up due to radiant heat and reducing the insulating performance. On the other hand, if a heat-shielding film is placed on the second surface of the first glass pane, as in this configuration, the second glass pane will be separated from the heat-shielding film and will therefore be less likely to heat up. This can improve the insulating performance of the double-glazed panel. Furthermore, if an antenna is placed indoors, the Low-E film will be placed on the third surface of the second glass plate, bringing it closer to the antenna, and a noise reduction effect can be obtained through coupling between the antenna and the Low-E film, which is made of, for example, a conductive thin film. As a result, the performance of the antenna placed indoors can also be improved.

[0015] As another characteristic configuration, it is preferable that the heat shielding film is a heat ray absorbing film.

[0016] When the heat-shielding film is a heat-ray absorbing film as in this configuration, the heat-shielding film can absorb infrared rays, thereby improving the heat-shielding performance of the double-glazed panel.

[0017] As another characteristic configuration, it is preferable that the surface resistivity of the heat shielding film is 20Ω or more.

[0018] When the surface resistivity of the heat shielding film is 20Ω or more as in this configuration, the heat shielding film has high radio wave transmittance, and loss of radio waves when passing through the heat shielding film can be suppressed.

[0019] As another characteristic configuration, the plate surface having the Low-E film has at least one exposed area, and it is preferable that the exposed area is larger than an area of ​​10 cm square and smaller than an area of ​​60 cm square.

[0020] In order to transmit and receive radio waves in the 5G band, the exposed area of ​​the Low-E coated surface of a double-glazing panel is preferably 10 cm square or larger, and a larger exposed area is preferable for more reliable transmission and reception of radio waves in the 5G band. However, if the exposed area is larger, the proportion of the exposed area on the first or second glass sheet increases, further reducing the thermal insulation properties of the double-glazing panel. Therefore, in this configuration, the surface of the first or second glass sheet that has the Low-E coated surface has at least one exposed area, which is larger than 10 cm square and smaller than 60 cm square. This allows the double-glazing panel to reduce the impact of the exposed area on the thermal insulation properties.

[0021] The exposed area on the plate surface having the Low-E film is preferably positioned to allow the passage of radio waves corresponding to high frequencies (30-300 MHz, 10 m-1 m), ultra-high frequencies (300-3000 MHz, 1 m-100 mm), and / or even higher ultra-high frequencies (3-30 GHz, 100 mm-10 mm).

[0022] The exposed area is also preferably arranged to allow passage of electromagnetic radiation corresponding to very high frequencies and / or only very high frequencies, more preferably radio waves corresponding to mobile phones or only mobile phones and / or devices that can connect wirelessly to the Internet.

[0023] As another characteristic configuration, it is preferable that the plate surface having the Low-E film has only one exposed region.

[0024] According to this configuration, the surface of the first or second glass sheet having the Low-E film has only one exposed area. This allows the double-glazed glass panel to minimize the impact of the exposed area on its thermal insulation. Furthermore, having only one exposed area makes it easier to position an antenna on the transmission path of radio waves, making it easier to improve the antenna's receiving sensitivity.

[0025]

[0026]

[0027] As another characteristic configuration, it is preferable that the difference in visible light transmittance calculated in accordance with JIS R3106 (1998) between the coated region and the exposed region is less than 10%.

[0028] By setting the difference in visible light transmittance between the coated area and the exposed area small as in this configuration, the difference in appearance between the coated area and the exposed area is small, thereby making it possible to reduce the impact of the exposed area on the appearance of the double-glazed panel.

[0029] As another characteristic configuration, it is preferable that the difference in visible light transmittance between the coated region and the exposed region is less than 5%.

[0030] According to this configuration, the difference in visible light transmittance between the coated area and the exposed area is less than 5%, which makes it possible to further reduce the impact of the exposed area on the appearance of the double-glazed panel.

[0031] As another characteristic configuration, it is preferable that the difference in reflected color tone between the coated area and the exposed area, calculated in accordance with JIS Z8781-4 (2013) based on observation from outside the room, is within 10 for a* and within 10 for b* on the CIE L*a*b* chromaticity coordinate diagram.

[0032] By setting the difference in reflected color tone between the coated area and the exposed area small as in this configuration, the difference in appearance between the coated area and the exposed area is small, thereby making it possible to reduce the impact of the exposed area on the appearance of the double-glazed glass panel.

[0033] As another characteristic configuration, it is preferable that the difference in the reflection color tone between the coated region and the exposed region is within 5 in a* and within 5 in b* on the CIE L*a*b* chromaticity coordinate diagram.

[0034] According to this configuration, the difference in reflected color tone between the coated area and the exposed area is within 5. Therefore, the impact of the exposed area on the appearance of the double-glazing panel can be further reduced.

[0035] As another characteristic feature, it is preferable that the Low-E film is a conductive thin film.

[0036] With this configuration, the Low-E film is a conductive thin film that can transmit and capture visible light while reflecting infrared light to block heat, thereby improving the thermal insulation performance of the double-glazed panel.

[0037] As another characteristic feature, it is preferable that the surface resistivity of the conductive thin film is less than 20Ω.

[0038] According to this configuration, the surface resistivity of the conductive thin film is less than 20 Ω and has high reflectivity in the wavelength range from infrared to radio waves. Therefore, the coated area has low radio wave transmittance but also low emissivity. This improves the thermal insulation performance of the double-glazed panel.

[0039] As another characteristic feature, it is preferable that the Low-E film contains a metal layer containing silver as a main component.

[0040] When the Low-E film contains a metal layer mainly composed of silver, as in this configuration, the Low-E film can suppress heat radiation, thereby improving the thermal insulation performance of the double-glazed panel.

[0041] As another characteristic configuration, it is preferable that the thickness of the metal layer is 5 nm or more and 15 nm or less.

[0042] In this configuration, the Low-E film has a metal layer of a specified thickness, which allows the Low-E film to suppress heat radiation. This improves the insulating performance of the double-glazed glass panel. Furthermore, by keeping the metal layer thickness to 15 nm or less, the impact of the Low-E film on the appearance can be reduced.

[0043] In another configuration, the Low-E film has a first antireflection layer on the inner side of the metal layer, closer to the plate surface on which the Low-E film is formed, and it is preferable that the total optical film thickness of the first antireflection layer is 60 nm or more and 120 nm or less.

[0044] According to this configuration, the Low-E film has a first antireflection layer of a predetermined thickness located closer to the glass plate surface than the metal layer. This allows the first antireflection layer to protect the metal layer and ensure the low-emission performance of the metal layer. Furthermore, the double-glazed panel can achieve high visible light transmittance and a desirable reflection color tone.

[0045] As another characteristic configuration, it is preferable that the Low-E film has a second antireflection layer on the outer side of the metal layer, away from the plate surface on which the Low-E film is formed, and that the total optical film thickness of the second antireflection layer is 60 nm or more and 120 nm or less.

[0046] According to this configuration, the Low-E film has a second anti-reflection layer of a predetermined thickness located on the far side of the glass plate from the metal layer. This allows the second anti-reflection layer to protect the metal layer and ensure the low-emission performance of the metal layer. Furthermore, the double-glazed panel achieves high visible light transmittance and a desirable reflection color tone.

[0047] As another characteristic configuration, it is preferable that the conductive thin film is a TCO (Transparent electrically conductive glass) type thin film.

[0048] A TCO-based thin film made of a transparent conductive oxide is a transparent conductive film that is coated on the surface of glass during the glass manufacturing process. Therefore, when the conductive thin film is a TCO-based thin film, as in this configuration, it can be easily arranged on the glass plate. In addition, because the TCO-based thin film is transparent, it is possible to make the coated area of ​​a double-glazed panel transparent. This makes it possible to reduce the impact of the coated area on the appearance of the double-glazed panel.

[0049] As another characteristic configuration, the exposed area is The aforementioned It is preferable that the area be an area where an antenna can be installed.

[0050] According to this configuration, the antenna is placed in the exposed area where no conductive film is formed, and the antenna can transmit and receive radio waves well through the exposed area, which has high radio wave permeability. [Brief explanation of the drawings]

[0051] [Figure 1] 1 is a cross-sectional view of a double-glazing panel according to a first embodiment. [Figure 2] FIG. 2 is a view taken along the line II-II in FIG. [Figure 3] FIG. 4 is a cross-sectional view of a double-glazing panel according to a second embodiment. [Figure 4] FIG. 4 is a view taken along the line IV-IV in FIG. 3. [Figure 5] FIG. 2 is a cross-sectional view of a double glazing panel showing the location of the antenna area. [Figure 6] FIG. 2 is a cross-sectional view of a double glazing panel showing the location of the antenna area. [Figure 7A] FIG. 2 is a plan view showing the positional relationship between a corresponding region and an antenna region. [Figure 7B] FIG. 2 is a plan view showing the positional relationship between a corresponding region and an antenna region. [Figure 7C] FIG. 2 is a plan view showing the positional relationship between a corresponding region and an antenna region. [Figure 8] 1A and 1B are diagrams showing the configuration and test results of an example. [Figure 9A]FIG. 10 is a diagram showing a simulation result of radio waves passing through an aperture. [Figure 9B] FIG. 10 is a diagram showing a simulation result of radio waves passing through an aperture. [Figure 10A] FIG. 10 is a diagram showing a simulation result of radio waves passing through an aperture. [Figure 10B] FIG. 10 is a diagram showing a simulation result of radio waves passing through an aperture. [Figure 11A] FIG. 10 is a diagram showing a simulation result of radio waves passing through an aperture. [Figure 11B] FIG. 10 is a diagram showing a simulation result of radio waves passing through an aperture. [Figure 12A] FIG. 10 is a diagram showing a simulation result of radio waves passing through an aperture. [Figure 12B] FIG. 10 is a diagram showing a simulation result of radio waves passing through an aperture. [Figure 13] FIG. 10 is a diagram showing another embodiment of a double glazing panel. DETAILED DESCRIPTION OF THE INVENTION

[0052] [First embodiment] A first embodiment of a double-glazing panel (hereinafter also referred to as "glass panel") 100 according to the present invention will be described with reference to Figs. 1 and 2. The glass panel 100 can be used for a variety of purposes, for example, as window glass for buildings, and for mobile objects such as automobiles, aircraft, ships, and trains. In addition, various antennas 60 for receiving radio waves can be disposed on the indoor (interior vehicle) side of both plate surfaces of the glass panel 100.

[0053] <Overview of double-glazed glass panels> As shown in FIG. 1, the glass panel 100 has two glass plates, namely a first glass plate 1 and a second glass plate 2, with substantially the same rectangular outer shape of the plate surface. The glass plates 1 and 2 are connected to each other by spacers 5 arranged at their peripheral portions. By the spacers 5, a void layer 3 is formed between the two glass plates 1 and 2. Further, in the first glass plate 1, a Low-E film 41 having radio wave shielding properties is formed on the plate surface (second surface 12) on the side of the void layer 3. The Low-E film 41 is, for example, a conductive thin film. The surface resistivity of the conductive thin film is preferably less than 20 Ω. In this way, the conductive thin film (Low-E film 41) has a high reflectivity in the wavelength range from the infrared region to the radio wave region. Therefore, the film region 42 where the Low-E film 41 is formed has low radio wave permeability but also low emissivity. Thereby, the heat insulation performance can be improved in the multilayer glass panel. Note that an antenna 60 for radio wave transmission and reception may be installed on the plate surface (fourth surface 14) on the indoor side of the glass panel 100, or the antenna 60 may be installed on the ceiling or the like indoors. Also, although not shown, the void layer 3 is sealed by a frame body with a sealing material arranged outside the spacers 5.

[0054] The first glass plate 1 has a first surface 11 which is the outdoor-side plate surface and a second surface 12 which is the plate surface on the side of the void layer 3. The second glass plate 2 has a third surface 13 which is the plate surface on the side of the void layer 3 and a fourth surface 14 which is the indoor-side plate surface.

[0055] The second surface 12 of the first glass plate 1 has a film region 42 where the Low-E film 41 is formed. As shown in FIG. 2, an exposed region 43 where the Low-E film 41 is not formed is provided in a part of the second surface 12 which is the plate surface where the Low-E film 41 is formed. The exposed region 43 is an area where the antenna 60 can be installed. The antenna 60 is, as shown in FIG. 1, attached to, for example, the plate surface on the indoor (inside the vehicle) side of the glass panel 100. In this way, by installing the antenna 60 in the exposed region 43, the antenna 60 can perform radio wave transmission and reception well through the exposed region 43.

[0056] <Low-E film> The Low-E film 41 is not particularly limited as long as it does not impede the objectives of the present invention. Preferably, however, it is a multilayer film including a layer primarily composed of silver. The Low-E film 41 is also preferably a multilayer film formed by stacking two or more layers selected from a metal layer, a metal oxide layer, a metal nitride layer, and a metal oxynitride layer. A suitable example of the metal layer is a silver layer. A suitable example of the metal oxide layer is a tin oxide layer, a titanium oxide layer, or a zinc oxide layer. A suitable example of the metal nitride layer is silicon nitride. A suitable example of the metal oxynitride layer is silicon oxynitride. The Low-E film 41 is preferably formed by a vacuum deposition method such as physical vapor deposition (PVD), with sputtering being particularly preferred because it can form a uniform film over a large area. The exposed region 43 is formed, for example, by forming the Low-E film 41 on a glass plate by sputtering and then removing the Low-E film 41 by laser processing or the like. The exposed region 43 may also be formed using various masking materials. By forming the exposed area 43 in this manner, it can be easily positioned at a desired position on the glass plate.

[0057] Furthermore, the Low-E film 41 is more preferably made of a multilayer structure in which three or more layers selected from a tin oxide layer, a silicon nitride layer, a silicon oxynitride layer, a titanium oxide layer, a zinc oxide layer, and a silver layer are stacked, and most preferably made of three or five layers in which, from the surface of the glass plate, (1) a tin oxide layer (an example of a first antireflection layer), a zinc oxide layer (an example of a first antireflection layer), a silver layer (an example of a metal layer), an aluminum-added zinc oxide layer (an example of a second antireflection layer), and a tin oxide layer (an example of a second antireflection layer); and (2) a silicon nitride layer (an example of a first antireflection layer), an aluminum-added zinc oxide layer (an example of a first antireflection layer), a silver layer (an example of a metal layer), and an aluminum-added zinc oxide layer (an example of a second antireflection layer) are stacked.

[0058] The Low-E film contains a metal layer whose main component is silver. The thickness of the metal layer is preferably 5 nm to 15 nm, and more preferably 5 nm to 10 nm. When the Low-E film 41 has a metal layer whose main component is silver and has a predetermined thickness, it is possible to suppress heat radiation. This allows the glass panel 100 to have improved heat insulation performance. Furthermore, when the thickness of the metal layer is 15 nm or less, it is possible to reduce the impact of the Low-E film on the appearance.

[0059] The Low-E film 41 preferably has a first antireflection layer on the inner side of the metal layer, closer to the plate surface on which the Low-E film 41 is formed, and the total optical thickness of the first antireflection layer is preferably 60 nm or more and 120 nm or less. The Low-E film 41 preferably has a second antireflection layer on the outer side of the metal layer, farther from the plate surface on which the Low-E film 41 is formed, and the total optical thickness of the second antireflection layer is preferably 60 nm or more and 120 nm or less. The optical thickness can be calculated by (refractive index n) x (film thickness d). When the first antireflection layer (second antireflection layer) is composed of multiple films, the sum of the optical thicknesses calculated for each film is the optical thickness of the first antireflection layer (second antireflection layer). When calculating the optical thickness, the refractive index varies depending on the wavelength of visible light. Here, the optical thickness is calculated based on the refractive index when the wavelength of visible light is a common reference wavelength (550 nm) in the visible range.

[0060] As described above, the Low-E film 41 has a first antireflection layer of a predetermined thickness located on the side of the metal layer closer to the second surface 12 of the first glass plate 1, thereby protecting the metal layer and providing the Low-E film with low reflection performance, thereby reliably blocking heat. Furthermore, the glass panel 100 can achieve high visible light transmittance and a favorable reflection color tone.

[0061] Furthermore, even if a second antireflection layer of a predetermined thickness is present on the side of the first glass plate 1 farther from the second surface 12 relative to the metal layer, the Low-E film 41 protects the metal layer, allowing the Low-E film to have low reflection performance and reliably block heat. Furthermore, the glass panel 100 can achieve high visible light transmittance and a favorable reflection color tone.

[0062] In this embodiment, the second surface 12 (plate surface) of the first glass plate 1, which has the coated region 42 and the exposed region 43, has only one exposed region 43. Having only one exposed region 43 makes it easier to arrange the antenna 60 on the transmission path of the radio waves, and the reception sensitivity of the antenna 60 can be easily improved.

[0063] The exposed region 43 is rectangular, and the distance between the outer edge 43a of the exposed region 43 and the outer edge 12a of the second surface 12 (plate surface) having the coated region 42 and the exposed region 43 is within 15 cm. The exposed region 43 is larger than a 10 cm square area and smaller than a 60 cm square area.

[0064] The rectangular shape of the exposed area 43 allows the glass panel 100 to maximize the radio wave transmittance of a rectangular antenna. Furthermore, for transmitting and receiving radio waves in the 5G band, the exposed area 43 of the glass panel 100 is preferably 10 cm square or larger. A larger area of ​​the exposed area 43 is preferable for more reliable transmission and reception of radio waves in the 5G band. However, if the area of ​​the exposed area 43 is increased, the proportion of the exposed area 43 in the first glass plate 1 increases, further reducing the thermal insulation properties of the glass panel 100. Therefore, in this embodiment, the second surface 12 of the first glass plate 1 has at least one exposed area 43, and the exposed area 43 is larger than a 10 cm square area and smaller than a 60 cm square area. This allows the glass panel 100 to minimize the impact of the exposed area 43 on the thermal insulation properties.

[0065] Furthermore, when the distance between the outer edge 43a of the exposed region 43 and the outer edge 12a of the second surface 12 of the first glass plate 1 is within 15 cm, the outer edge 43a of the exposed region 43 is close to the outer edge 12a of the second surface 12 of the first glass plate 1. This allows the exposed region 43 to be positioned close to the periphery of the second surface 12 of the first glass plate 1. As a result, the impact of the exposed region 43 on the appearance of the glass panel 100 can be reduced.

[0066] The difference in visible light transmittance calculated in accordance with JIS R3106 (1998) between the coated region 42 and the exposed region 43 is less than 10%. It is more preferable that the difference in visible light transmittance between the coated region 42 and the exposed region 43 is less than 5%.

[0067] In the coated region 42 and the exposed region 43, the difference in reflected color tone from a plate surface not having the coated region 42 or the exposed region 43, calculated in accordance with JIS Z8781-4 (2013), is within 10 for a* and within 10 for b* in the CIE L*a*b* chromaticity coordinate diagram. It is more preferable that the difference in reflected color tone in the coated region 42 and the exposed region 43 is within 5 for a* and within 5 for b* in the CIE L*a*b* chromaticity coordinate diagram.

[0068] The exposed area 43 is preferably positioned to allow the passage of radio waves corresponding to high frequencies (30-300 MHz, 10 m-1 m), ultra-high frequencies (300-3000 MHz, 1 m-100 mm), and / or even higher ultra-high frequencies (3-30 GHz, 100 mm-10 mm).

[0069] Also, the exposed area 43 is preferably arranged to allow the passage of electromagnetic radiation corresponding to very high frequencies and / or only very high frequencies, more preferably radio waves corresponding to mobile phones or only mobile phones and / or devices that can connect wirelessly to the Internet.

[0070] Second Embodiment 3 and 4, in the glass panel 100 of the second embodiment, a heat-shielding film 51 is disposed on the second surface 12 of the first glass plate 1, and a Low-E film 41 is disposed on the third surface 13 of the second glass plate 2. The third surface 13 of the second glass plate 2 is provided with a coated region 42 where the Low-E film 41 is formed, and an exposed region 43 where the Low-E film 41 is not formed. The exposed region 43 is an area where an antenna 60 can be installed. As in the first embodiment, the Low-E film 41 is formed of, for example, a conductive thin film.

[0071] The exposed area 43 is rectangular, and the distance between the outer edge 43a of the exposed area 43 and the outer edge 13a of the third surface 13 (plate surface) of the second glass plate 2 having the coated area 42 and the exposed area 43 is within 15 cm. The exposed area 43 is larger than a 10 cm square area and smaller than a 60 cm square area. Because 5G band radio waves are highly directional (linear), it is important to design the angle of radio wave transmission and reception according to the usage environment. In other words, the position of the exposed area 43 relative to the glass plate is important. Therefore, it is desirable to appropriately arrange the number, size, and position of the exposed areas 43 depending on the usage environment and the desired direction of radio wave transmission and reception.

[0072] <Heat-shielding film> The heat shielding film 51 is not particularly limited as long as it does not impede the object of the present invention, but is preferably a multilayer film including a layer whose main component is titanium nitride. A suitable example of a metal nitride layer is a titanium nitride layer. The film thickness of the heat shielding film 51 is appropriately selected depending on the type of film to be laminated, but is usually 5 to 100 nm, and preferably 10 to 50 nm. The heat shielding film 51 is composed of, for example, a heat ray absorbing film. When the heat shielding film 51 is a heat ray absorbing film, infrared rays can be absorbed by the heat shielding film 51, thereby improving the heat shielding properties of the glass panel 100.

[0073] As shown in the table in Figure 8 described below, the double-glazed glass panel having the heat-shielding film 51 (the exposed area in Example 2) has a visible light transmittance of 60% or less and a solar heat gain coefficient calculated in accordance with JIS R3106 (1998) of 0.6 or less, and the Low-E film 41 (the coated area in Example 1) has a visible light transmittance of 70% or more and a solar heat gain coefficient of 0.7 or more.

[0074] The Low-E film 41 is a heat ray reflective film containing a metal layer mainly composed of, for example, silver. Heat ray reflective films have low radio wave transmittance and a surface resistivity of, for example, less than 20Ω. On the other hand, the heat shielding film 51 is a heat ray absorbing film having, for example, a titanium nitride layer. Heat ray absorbing films have radio wave transmittance and a surface resistivity of 20Ω or more. The surface resistivity of the TiN / TiO2 film used as the heat shielding film 51 in Example 2 described below is 5000Ω.

[0075] In the glass panel 100 of the second embodiment, the difference in visible light transmittance calculated in accordance with JIS R3106 (1998) between the coated region 42 and the exposed region 43 is also less than 10%. It is more preferable that the difference in visible light transmittance between the coated region 42 and the exposed region 43 is less than 5%.

[0076] Furthermore, the coated region 42 and the exposed region 43 conform to JIS Z8781-4 (2013), and the difference in reflected color tone between the coated region 42 and the exposed region 43, calculated by observation from the outside of the room, is within 10 for a* and within 10 for b* on the CIE L*a*b* chromaticity coordinate diagram. It is more preferable that the difference in reflected color tone between the coated region 42 and the exposed region 43 is within 5 for a* and within 5 for b* on the CIE L*a*b* chromaticity coordinate diagram.

[0077] In the first and second embodiments, the antenna can be disposed, for example, on the surface facing the interior, i.e., the fourth surface 14 of the second glass plate 2. In this case, the position of the antenna region where the antenna is disposed is not particularly limited, but the antenna can be disposed, for example, as shown in FIG. 5 , particularly for 5G radio waves. In the example of FIG. 5 , when both glass plates 1 and 2 are viewed from a direction perpendicular to them, the antenna 60 can be disposed in a region 6 (hereinafter referred to as the "corresponding region 6") on the fourth surface 14 of the second glass plate 2 that corresponds to the exposed region 43. The antenna 60 may be the same size as the corresponding region 6, or it may be smaller than the corresponding region 6. For example, because 5G radio waves have a high degree of directional propagation, disposing the antenna 60 in the corresponding region 6 as described above can particularly enhance the sensitivity of transmitting and receiving 5G radio waves.

[0078] Alternatively, as shown in FIGS. 6 and 7A, the antenna 60 can be formed so that at least a portion thereof extends into the corresponding region 6. In the example of FIGS. 6 and 7A, the lower end of the antenna 60 is positioned a distance L inward from the lower end of the corresponding region 6. This is done in consideration of the linearity of 5G radio waves, assuming, for example, that the radio waves are incident at an angle onto the glass body. That is, as shown in FIG. 6, when radio waves with high linearity are incident, the strength of the radio waves reaching the region extending from the end of the corresponding region 6 over the distance L becomes weak. This distance L is, for example, preferably 10 mm or more, more preferably 20 mm or more, and particularly preferably 50 mm or more. Furthermore, the length S of the end portion extending the distance L (see FIG. 7A) can be, for example, 10 mm or more.

[0079] 7B, a portion of antenna 60 may protrude from corresponding region 6. Also, as shown in FIG. 7C, the end of antenna 60 that is separated from corresponding region 6 by distance L may be a side of antenna 60. [Example]

[0080] The following describes the glass panels of Examples 1 and 2. The configuration of the glass panels of Examples 1 and 2 is as shown in FIG.

[0081] Example 1 The glass panel of Example 1 corresponds to the glass panel 100 of the first embodiment, and has a Low-E film 41 formed on the second surface 12 of the first glass plate 1. As shown in the table of Fig. 8 , the Low-E film 41 is formed by laminating tin oxide, zinc oxide, silver, a zinc-aluminum alloy, zinc oxide, and tin oxide from the plate surface of the second surface 12. The first glass plate 1 and the second glass plate 2 are made of float glass (soda-lime glass) with a plate thickness of 6 mm, and the gap layer 3 between the first glass plate 1 and the second glass plate 2 is 12 mm thick.

[0082] The Low-E film 41 has a first anti-reflection layer made of tin oxide (19 nm thick) and zinc oxide (27 nm thick) on the side closer to the plate surface on which the Low-E film 41 is formed, inside the silver metal layer. The Low-E film 41 has silver (6.5 nm thick) as the metal layer. The Low-E film 41 has a second anti-reflection layer made of a zinc-aluminum alloy (0.4 nm thick), zinc oxide (27 nm thick), and tin oxide (15 nm thick) on the side farther from the plate surface on which the Low-E film 41 is formed. The total optical thickness of the first antireflection layer (inner antireflection layer optical thickness) is approximately 94 nm. The total optical thickness of the second antireflection layer (outer antireflection layer optical thickness) is approximately 85 nm. When calculating the optical thickness, the refractive index varies depending on the wavelength of visible light. Here, the optical thickness is based on the refractive index when the wavelength of visible light is the standard wavelength in the visible range (550 nm). Incidentally, the refractive index of tin oxide is 2.08, and the refractive index of zinc oxide is 2.00.

[0083] Example 2 The glass panel of Example 2 corresponds to the glass panel 100 of the second embodiment, and has a heat-shielding film 51 formed on the second surface 12 of the first glass plate 1, and a Low-E film 41 formed on the third surface 13 of the second glass plate 2. As shown in the table of Fig. 8 , the Low-E film 41 has the same layer structure as in Example 1, and the heat-shielding film 51 is formed by laminating titanium nitride (film thickness 6 nm) and titanium oxide (film thickness 5 nm) from the plate surface of the second surface 12 of the first glass plate 1.

[0084] [First Exam] The visible light transmittance and visible light reflectance were calculated in accordance with JIS R3106:1998 for the coated region 42 and exposed region 43 of the double-glazing panels of Examples 1 and 2. The values ​​of the visible light transmittance and visible light reflectance, the solar heat gain coefficient calculated in accordance with JIS R3106 (1998), and the overall unit heat transmission coefficient (U value) calculated in accordance with JIS R3107 (1998) are shown in Figure 8.

[0085] [First test results] In Example 1, the difference in "visible light transmittance" between the coated region 42 and the exposed region 43 was 1.8%, the difference in "visible light reflectance / out" (outside the room) was 2.4%, and the difference in "visible light reflectance / in" (inside the room) was 1.8%. Thus, in Example 1, the differences in visible light transmittance and visible light reflectance between the coated region 42 and the exposed region 43 were all within 5%. This proves that there is little difference in appearance between the coated region 42 and the exposed region 43 in the glass panel of Example 1.

[0086] In Example 2, the difference in "visible light transmittance" between the coated region 42 and the exposed region 43 was 1.4%, the difference in "visible light reflectance / out" (outside the room) was 0.9%, and the difference in "visible light reflectance / in" (inside the room) was 2.5%. Thus, in Example 2 as well, the differences in visible light transmittance and visible light reflectance between the coated region 42 and the exposed region 43 were all within 5%. This demonstrated that the glass panel of Example 2 also had little difference in appearance between the coated region 42 and the exposed region 43. Furthermore, the solar heat gain coefficient was lower than in Example 1, demonstrating that the formation of the heat-shielding film 51 improves the heat-shielding properties of the double-glazed glass panel.

[0087] [Second Exam] In the coated region 42 and exposed region 43 of the double-glazing panels of Examples 1 and 2, the transmitted color tone and reflected color tone were calculated based on observation from the outside of the room in accordance with JIS Z8781-4 (2013). Specifically, the transmitted color tone and reflected color tone were calculated as a* and b* in the CIE L*a*b* chromaticity coordinate diagram. The values ​​of the transmitted color tone and reflected color tone are shown in Figure 8.

[0088] [Second test results] The coated region 42, on which the Low-E film 41 is formed, differs in transmission color tone and reflection color tone from the exposed region 43, on which the Low-E film 41 is not formed. In Example 1, the difference in "transmission color tone" between the coated region 42 and the exposed region 43 was 1.0 for "a*" and 1.7 for "b*." The difference in "reflected color tone / out" (outside) was 1.0 for "a*" and 1.0 for "b*." The difference in "reflected color tone / in" (inside) was 0.2 for "a*" and 0.1 for "b*." Thus, in Example 1, the difference in "a*" and "b*" between the coated region 42 and the exposed region 43 for "transmission color tone," "reflected color tone / out" (outside), and "reflected color tone / in" (inside) was all within 5. This demonstrates that there is little difference in appearance between the coated region 42 and the exposed region 43 in the glass panel of Example 1.

[0089] In Example 2, the difference in "transmitted color tone" between the coated region 42 and the exposed region 43 was 0.9 for "a*" and 0.1 for "b*," the difference in "reflected color tone / out" (outside of the room) was 0.1 for "a*" and 0.6 for "b*," and the difference in "reflected color tone / in" (inside of the room) was 1.2 for "a*" and 0.9 for "b*." Thus, in Example 2, the difference in "a*" and the difference in "b*" between the coated region 42 and the exposed region 43 in "transmitted color tone," "reflected color tone / out" (outside of the room), and "reflected color tone / in" (inside) were all within 5. This demonstrated that there was little difference in appearance between the coated region 42 and the exposed region 43 in the glass panel of Example 2 as well.

[0090] (Consideration of antenna area position) A simulation was performed using a shielding plate with a 100 mm × 100 mm opening through which radio waves can pass. This opening represents exposed area 43. Simulations were performed in which 30 GHz and 10 GHz radio waves were irradiated onto this shielding plate. The irradiation angles of the radio waves relative to the shielding plate were 90°, 60°, and 30°. This simulation was performed using the electromagnetic field simulator Micro-Stripes2. Figure 9A shows the distribution of radio waves when 30 GHz radio waves are irradiated at 90°, and Figure 9B shows the distribution of radio waves when 10 GHz radio waves are irradiated at 90°. Figure 10A shows the distribution of radio waves when 30 GHz radio waves are irradiated at 60°, and Figure 10B shows the distribution of radio waves when 10 GHz radio waves are irradiated at 60°. Figure 11A shows the distribution of radio waves when 30 GHz radio waves are irradiated at 30°, and Figure 11B shows the distribution of radio waves when 10 GHz radio waves are irradiated at 30°. In these figures, the radio waves are irradiated in the direction indicated by the arrows. The areas surrounded by dotted lines indicate the distribution of strong or weak radio waves.

[0091] 9 to 11, it can be seen that the radio waves travel straight in the direction of the arrow after passing through the opening. In particular, it can be seen that the high-frequency 30 GHz radio waves have a higher tendency to travel in a straighter direction than the low-frequency 10 GHz radio waves. It can also be seen that the low-frequency 10 GHz radio waves spread out somewhat after passing through the aperture.

[0092] Furthermore, because 30 GHz radio waves have a high tendency to travel in a straight line, when the radio waves are irradiated obliquely, as shown in, for example, FIGS. 10A and 11A, the radio waves do not reach the triangular area M after passing through the opening very well.

[0093] From the above, it has been found that, particularly for 5G radio waves, it is preferable to provide the antenna region at a position corresponding to exposed region 43, as shown in Figures 5 to 7. Furthermore, when radio waves are incident at an angle, a region with weak radio wave strength such as region M described above occurs, so it is preferable to provide the antenna region at a distance L from corresponding region 6 depending on the direction of the radio waves, for example, as shown in Figures 6 and 7.

[0094] FIG. 10A shows that one side of region M is 24 mm, which is an example of a glass body having a total thickness of 24 mm (first glass plate: 9 mm, air gap: 6 mm, second glass plate: 9 mm). In this case, it is shown that the radio wave intensity is weak in a region up to 13.9 mm from the edge of the corresponding region on the fourth surface 14 of the second glass plate 2. On the other hand, FIG. 11A shows that one side of region M is 30 mm, which is an example of a glass body having a total thickness of 30 mm (first glass plate: 9 mm, air gap: 12 mm, second glass plate: 9 mm). In this case, it is shown that the radio wave intensity is weak in a region up to 52 mm from the edge of the corresponding region on the fourth surface 14 of the second glass plate 2.

[0095] From the above, based on the results of FIGS. 10A and 11A, the distance L shown in FIGS. 6 and 7 is preferably 10 mm or more, more preferably 20 mm or more, and particularly preferably 50 mm or more.

[0096] (Consideration of the size of the antenna area) Simulations were performed in the same manner as described above (Study of the antenna region position). Simulations were performed for aperture sizes of 100 mm × 100 mm and 33 mm × 33 mm. The results are shown in FIG. 12. FIG. 12A shows the results of a simulation using an aperture of 100 mm × 100 mm (frequency: 30 GHz), and FIG. 12B shows the results of a simulation using an aperture of 33 mm × 33 mm (frequency: 10 GHz). As shown in these figures, if the aperture size is small, the radio waves that pass through the aperture spread and cannot maintain their linearity. Therefore, it was found that the size of the above-mentioned exposed region 43 is preferably larger than a 33 mm × 33 mm rectangle.

[0097] Other Embodiments (1) In the above embodiment, the Low-E film 41 is disposed on the second surface 12 of the first glass plate 1 or the third surface 13 of the second glass plate 2, but the Low-E film 41 may be disposed on the first surface 11 of the first glass plate 1 or the fourth surface 14 of the second glass plate 2. In other words, the Low-E film 41 may be disposed on one or more of both plate surfaces 11, 12 of the first glass plate 1 and both plate surfaces 13, 14 of the second glass plate 2.

[0098] (2) In the second embodiment, the heat-shielding film 51 is disposed on the second surface 12 of the first glass plate 1, and the Low-E film 41 is disposed on the third surface 13 of the second glass plate 2. However, the heat-shielding film 51 may be disposed on the first surface 11 of the first glass plate 1, and the Low-E film 41 may be disposed on the third surface 13 of the second glass plate 2. Alternatively, the Low-E film 41 may be disposed on the second surface 12 of the first glass plate 1, and the heat-shielding film 51 may be disposed on the first surface 11 of the first glass plate 1 or the third surface 13 or fourth surface 14 of the second glass plate 2. If the heat-shielding film 51 is disposed on the first surface 11 of the first glass plate 1, the heat-shielding film 51 can shield infrared rays contained in sunlight, thereby providing heat-shielding properties across the entire surface of the glass panel 100. In other words, the heat-shielding film 51 can ensure heat-shielding properties even in exposed areas where the Low-E film 41 is not formed.

[0099] (3) In the above embodiment, an example was shown in which the Low-E film 41 was a film containing a metal layer mainly composed of silver. However, the Low-E film 41 may also be a TCO-based thin film. A TCO-based thin film is a transparent conductive film that is coated on the glass surface during, for example, a glass manufacturing process (online CVD manufacturing method). The metal thin film of this transparent conductive film is a fluorine-doped tin oxide (FTO) film. Since the Low-E film 41 is a TCO-based thin film, it can be easily disposed on the glass plates 1 and 2. Furthermore, because a TCO-based thin film is transparent, the coated region 42 of the glass panel 100 can be made transparent. This reduces the impact of the exposed region 43 on the appearance of the glass panel 100.

[0100] (4) In the above embodiment, the entire outer periphery of exposed region 43 is formed in a position surrounded by coated region 42, but as shown in Fig. 13, exposed region 43 may be exposed region 43A located at a corner of the surface of glass plate 1, 2 inside the frame, exposed region 43B adjacent to one side of the surface of glass plate 1, 2, or exposed region 43C whose longitudinal direction is the up-down direction. Furthermore, exposed region 43 is not limited to a rectangular shape, and may be a circular shape including an ellipse or an oval, a triangular shape, a polygonal shape with pentagons or more sides, or the like. [Industrial Applicability]

[0101] The present invention can be applied to a double-glazing panel in which a Low-E film is formed on a glass plate. [Explanation of symbols]

[0102] 1: First glass plate 2: Second glass plate 3 :Void layer 5: Spacer 11: 1st page 12:Second side 12a: outer edge 13:Third side 13a: outer edge 41: Low-E film 42:Coating area 43:Exposed area 43A :Exposed area 43B:Exposed area 43C:Exposed area 43a: outer edge 51: Heat-shielding film 60: Antenna 100: Glass panel (double-glazed glass panel)

Claims

1. A first glass plate; a second glass plate disposed opposite the first glass plate; a spacer disposed between the first glass plate and the second glass plate and forming a gap layer between the first glass plate and the second glass plate, a coated region on a surface of at least one of the first glass plate and the second glass plate, the coated region having a Low-E film formed thereon, and an exposed region on which the Low-E film is not formed; the exposed area is rectangular; the distance between the outer edge of the exposed region and the outer edge of the plate surface having the Low-E film is within 15 cm; an antenna is provided at a position overlapping a corresponding area of ​​either the first glass plate or the second glass plate that corresponds to the exposed area when viewed from a direction perpendicular to the first glass plate and the second glass plate; The exposed area is configured to allow passage of radio waves corresponding to ultra-high frequencies (3 to 30 GHz, 100 mm to 10 mm), A double-glazed glass panel, wherein the distance from the lower end of the corresponding area to the lower end of the antenna is 10 mm or more.

2. When the first glass plate is on the outdoor side, and a plate surface of the first glass plate opposite to the air gap layer is defined as a first surface, a plate surface of the first glass plate on the air gap layer side is defined as a second surface, a plate surface of the second glass plate on the air gap layer side is defined as a third surface, and a plate surface of the second glass plate opposite to the air gap layer is defined as a fourth surface, 2. The double-glazing panel according to claim 1, wherein the coated area and the exposed area are located on the second surface of the first glass sheet or the third surface of the second glass sheet.

3. the Low-E film is disposed on the second surface of the first glass plate; The double-glazing panel according to claim 2 , wherein a heat-shielding film is disposed on the first surface of the first glass plate, the third surface of the second glass plate, or the fourth surface of the second glass plate.

4. the Low-E film is disposed on the third surface of the second glass plate; 3. The double-glazing panel according to claim 2, wherein a heat-shielding film is disposed on the second surface of the first glass sheet.

5. 5. The double-glazing panel according to claim 3, wherein the heat-shielding film is a heat-absorbing film.

6. 5. The double-glazing panel according to claim 3, wherein the heat-shielding film has a surface resistivity of 20 Ω or more.

7. the plate surface having the Low-E film has at least one exposed area; 7. A double glazing panel according to any preceding claim, wherein the exposed area is greater than an area of ​​10 cm square and less than an area of ​​60 cm square.

8. 8. The double-glazing panel according to claim 7, wherein the plate surface having the Low-E film has only one exposed area.

9. 9. The double-glazed glass panel according to claim 1, wherein the difference in visible light transmittance between the coated region and the exposed region, calculated in accordance with JIS R3106 (1998), is less than 10%.

10. In the coated region and the exposed region, 10. The insulating glazing panel of claim 9, wherein the difference in visible light transmittance is less than 5%.

11. 11. The double-glazed glass panel according to claim 1, wherein a difference in reflected color tone between the coated region and the exposed region, calculated in accordance with JIS Z8781-4 (2013) based on observation from outside the room, is within 10 for a* and within 10 for b* in a CIE L*a*b* chromaticity coordinate diagram.

12. In the coated region and the exposed region, 12. The insulating glass panel according to claim 11, wherein the difference in reflected color tone is within 5 in a* and within 5 in b* on the CIE L*a*b* chromaticity coordinate diagram.

13. 13. The insulating glass panel according to claim 1, wherein the Low-E film is a conductive thin film.

14. 14. The double-glazing panel according to claim 13, wherein the surface resistivity of the conductive thin film is less than 20 Ω.

15. The double-glazing panel according to any one of claims 1 to 14, wherein the Low-E film contains a metal layer containing silver as a main component.

16. 16. The double-glazing panel according to claim 15, wherein the metal layer has a thickness of 5 nm or more and 15 nm or less.

17. the Low-E film has a first antireflection layer on the inner side of the metal layer, closer to the plate surface on which the Low-E film is formed; 17. The double-glazing panel according to claim 16, wherein the total optical thickness of the first antireflection layer is 60 nm or more and 120 nm or less.

18. the Low-E film has a second antireflection layer on the outer side of the metal layer, away from the plate surface on which the Low-E film is formed; 17. The double-glazing panel according to claim 16, wherein the total optical thickness of the second antireflection layer is 60 nm or more and 120 nm or less.

19. 15. The double glazing panel according to claim 13, wherein the conductive thin film is a TCO-based thin film.

20. 20. The double glazing panel according to claim 1, wherein the exposed area is an area where the antenna can be installed.

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