Laminated Glass

Abstract

A laminated glass (1_1) according to the present invention is provided with: a first glass sheet (11); a second glass sheet (12); and an intermediate film (13_1). The intermediate film (13_1) has a laminated region that has: a first layer (21) in contact with the first glass sheet (11); a second layer (22) in contact with the second glass sheet (12); and a third layer (23) disposed between the first layer (21) and the second layer (22). When the relative dielectric constant of the first glass sheet (11) is defined as εg1, the relative dielectric constant of the second glass sheet (12) is defined as εg2, the relative dielectric constant of the first layer (21) is defined as εm1, the relative dielectric constant of the second layer (22) is defined as εm2, and the relative dielectric constant of the third layer (23) is defined as εm3, there are relationships of εm1<εg1, εm1<εg2, εm2<εg1, εm2<g2, εm3>εm1, and εm3>εm2.

Description

[Technical field]

[0001] The present invention relates to laminated glass, and in particular to laminated glass for vehicles. [Background technology]

[0002] In recent years, in addition to communications using wavelength bands such as microwaves and millimeter waves, high-speed, large-capacity communications infrastructure such as 4G, LTE, and 5G has expanded, and the frequency bands used tend to expand from the 3 GHz band to the 5-80 GHz band. For example, when transmitting and receiving signals using millimeter-wave radar installed in a car, gain attenuation caused by window glass, which was not significant in previous frequency band communications (for example, up to 3 GHz), has become an issue.

[0003] As a technique for solving such problems, Patent Document 1 discloses a configuration in which part of window glass, particularly laminated glass for automobiles, is replaced with a radio wave transparent material and fitted in. In other words, Patent Document 1 discloses a configuration in which, in a laminated glass having two pieces of glass and an interlayer film sandwiched between them, a radio wave transparent material is provided in at least the part from which the inner (interior) glass has been removed, in order to increase the transmittance of the window member to millimeter wave radar.

[0004] Furthermore, Patent Document 2 discloses a glass pane that can enhance the detection sensitivity of electromagnetic radiation. The glass pane disclosed in Patent Document 2 enhances the detection sensitivity of electromagnetic radiation that passes through a hole by providing a hole in a part of the inner pane of a composite glass pane (laminated glass). [Prior art documents] [Patent documents]

[0005] [Patent Document 1] International Publication No. 2017 / 188415 [Patent Document 2] Special Publication No. 2011-502090 Summary of the Invention [Problem to be solved by the invention]

[0006] However, when removing part of the glass to increase the transmittance of millimeter wave radar and providing a radio wave transparent material in the area where the glass was removed, as in the window member of Patent Document 1, there was a problem that the manufacturing process became complicated.

[0007] Furthermore, when a hole is provided in part of the inner pane of a composite glass pane (laminated glass) as in Patent Document 2, part of the inner pane is removed, which poses the problem of a reduction in the glass strength required for the composite glass pane (laminated glass).

[0008] In view of the above problems, an object of the present invention is to provide a laminated glass which has improved radio wave transmittance in the millimeter wave band and which satisfies the inherent strength required for laminated glass. [Means for solving the problem]

[0009] A laminated glass according to a first aspect of the present invention comprises a first glass plate, a second glass plate, and an intermediate film sandwiched between the first glass plate and the second glass plate. The intermediate film has a laminated region having a first layer in contact with the first glass plate, a second layer in contact with the second glass plate, and a third layer disposed between the first layer and the second layer, in a plan view of the first glass plate. Let F [GHz] be a predetermined frequency in the range of 60 GHz to 100 GHz, and ε be the relative dielectric constant of the first glass plate at the frequency F. g1 , the relative dielectric constant of the second glass plate is ε g2 , the relative dielectric constant of the first layer is ε m1 , the relative dielectric constant of the second layer is ε m2 , the relative dielectric constant of the third layer is ε m3 When ε m1 <ε g1 , ε m1 <ε g2 , ε m2 <ε g1 , ε m2 <ε g2 , εm3 >ε m1 , ε m3 >ε m2 , The above relationship exists.

[0010] In the laminated glass of the first aspect, the ε g1 , the ε g2 and the ε m3 teeth, ε m3 <ε g1 , ε m3 <ε g2 , may have the relationship:

[0011] In the laminated glass of the first aspect, the ε m1 , the ε m2 and the ε m3 teeth, ε m3 / ε m1 ≧1.2, ε m3 / ε m2 ≧1.2 may be satisfied.

[0012] In the laminated glass of the first aspect, the thickness of the interlayer is T and the thickness of the third layer is T m3 Then, T m3 / T≧0.1 may be satisfied.

[0013] In the laminated glass of the first aspect, the ε m1 , the ε m2 and the ε m3 teeth, ε m3 / ε m1 ≧1.37, ε m3 / ε m2 ≧1.37, may be satisfied.

[0014] In the laminated glass of the first aspect, the ε m1 , the ε m2 and the ε m3 teeth, 2.11 ≧ ε m3 / ε m1 , 2.11 ≥ ε m3 / ε m2 , may be satisfied.

[0015] In the laminated glass of the first aspect, the thickness of the interlayer is T and the thickness of the third layer is T m3 When T m3 / T<1 may be satisfied.

[0016] A laminated glass according to a second aspect of the present invention comprises a first glass plate, a second glass plate, and an intermediate film sandwiched between the first glass plate and the second glass plate. In a plan view of the first glass plate, the intermediate film has a laminated region having a first layer in contact with the first glass plate, a second layer in contact with the second glass plate, and a third layer disposed between the first layer and the second layer. A predetermined frequency in the range of 60 GHz to 100 GHz is defined as F [GHz], and the relative dielectric constant of the first layer at the frequency F is ε m1 , the relative dielectric constant of the second layer is ε m2 , the relative dielectric constant of the third layer is ε m3 When ε m1 >ε m3 , ε m2 >ε m3 , The relationship is as follows: The thickness of the intermediate film in the laminated region is T, and the thickness of the first layer is T m1 , the thickness of the second layer is T m2 When (T m1 +T m2 ) / T≧0.5, The above relationship exists.

[0017] In the laminated glass of the second aspect, the relative dielectric constant of the first glass plate at the frequency F is ε g1 , the relative dielectric constant of the second glass plate is ε g2 Then, the above ε g1 , the ε g2 , the ε m1 and the ε m2 teeth, ε m1 <εg1 , ε m1 <ε g2 , ε m2 <ε g1 , ε m2 <ε g2 , The relationship may be as follows:

[0018] In the laminated glass of the second aspect, the ε m1 , the ε m2 and the ε m3 teeth, ε m1 / ε m3 ≧1.2, ε m2 / ε m3 ≧1.2 may be satisfied.

[0019] In the laminated glass of the second aspect, the ε m1 , the ε m2 and the ε m3 teeth, ε m1 / ε m3 ≧1.37, ε m2 / ε m3 ≧1.37 may be satisfied.

[0020] In the laminated glass of the second aspect, the ε m1 , the ε m2 and the ε m3 teeth, 2.11 ≧ ε m1 / ε m3 , 2.11 ≥ ε m2 / ε m3 may be satisfied.

[0021] In the laminated glass of the second aspect, the thickness T of the interlayer film and the thickness T of the first layer m1 , the thickness T of the second layer m2 0.66≦(T m1 +T m2 ) / T<1 may be satisfied.

[0022] A laminated glass according to a third aspect of the present invention comprises a first glass plate, a second glass plate, and an intermediate film sandwiched between the first glass plate and the second glass plate. The intermediate film has a laminated region having a first layer in contact with the first glass plate and a second layer in contact with the second glass plate in a plan view of the first glass plate. A predetermined frequency between 60 GHz and 100 GHz is F [GHz], and the relative dielectric constant of the first glass plate at the frequency F is ε g1 , the relative dielectric constant of the second glass plate is ε g2 The dielectric constant of the first layer or the second layer, whichever has a relatively higher dielectric constant, is defined as ε mH The lower dielectric constant is ε mL When ε mH <ε g1 , ε mH <ε g2 , ε mL <ε g1 , ε mL <ε g2 , The relationship is as follows: The thickness of the intermediate film in the laminated region is T, and the thickness of the layer having a relatively higher dielectric constant among the first layer and the second layer is T mH When T mH / T≧0.3 The above relationship exists.

[0023] In the laminated glass of the third aspect, the ε mH and the ε mL teeth, ε mH / ε mL ≧1.2 may be satisfied.

[0024] In the laminated glass of the third aspect, the ε mH and the ε mL teeth, ε mH / ε mL ≧1.37 may be satisfied.

[0025] In the laminated glass of the third aspect, the T and the T mH teeth, 0.66≦T mH / T<1 may be satisfied.

[0026] In the above laminated glass, the interlayer film may have, in a plan view of the first glass plate, a first region which is the laminated region, and a second region in which the interlayer film is composed of at least one of the first layer and the second layer.

[0027] In the above laminated glass, the frequency F may be 79 GHz.

[0028] In the laminated glass, the layer having a high relative dielectric constant among the layers constituting the interlayer film may be formed by mixing a filler having a high dielectric constant with a resin material. Effect of the Invention

[0029] The present invention can provide laminated glass that has improved radio wave transmittance in the millimeter wave band and that satisfies the inherent strength required for laminated glass. [Brief description of the drawings]

[0030] [Figure 1] FIG. 1 is a diagram showing a vehicle equipped with a laminated glass according to the present invention. [Diagram 2] FIG. 1 is a cross-sectional view of a laminated glass according to the present invention. [Diagram 3] FIG. 1 is a cross-sectional view of a laminated glass according to a first embodiment. [Figure 4] 4 is a simulation result showing the relationship between the proportion of a high dielectric constant layer in an interlayer film and radio wave transmission characteristics in the laminated glass according to the first embodiment. [Diagram 5] 4 is a simulation result showing radio wave transmission characteristics in a predetermined frequency band of the laminated glass according to the first embodiment. [Figure 6]4 is a simulation result showing the relationship between the proportion of a high dielectric constant layer in an interlayer film and radio wave transmission characteristics in the laminated glass according to the first embodiment. [Figure 7] FIG. 4 is a cross-sectional view of a laminated glass according to a second embodiment. [Figure 8] 11 is a simulation result showing the relationship between the proportion of the high dielectric layer in the interlayer film and the radio wave transmission characteristics in the laminated glass according to the second embodiment. [Figure 9] 6 is a simulation result showing the radio wave transmission characteristics in a predetermined frequency band of the laminated glass according to the second embodiment. [Figure 10] 11 is a simulation result showing the relationship between the proportion of the high dielectric layer in the interlayer film and the radio wave transmission characteristics in the laminated glass according to the second embodiment. [Figure 11] FIG. 11 is a cross-sectional view of a laminated glass according to a third embodiment. [Figure 12] 11 is a simulation result showing the relationship between the proportion of the high dielectric layer in the interlayer film and the radio wave transmission characteristics in the laminated glass according to the third embodiment. [Figure 13] 13 is a simulation result showing radio wave transmission characteristics in a predetermined frequency band of the laminated glass according to the third embodiment. [Figure 14] 11 is a simulation result showing the relationship between the proportion of the high dielectric layer in the interlayer film and the radio wave transmission characteristics in the laminated glass according to the third embodiment. [Figure 15] 1 is a table for explaining an example of a dielectric material made of PVB and alumina. [Figure 16] FIG. 2 is a cross-sectional view showing another example of the configuration of the laminated glass according to the present invention. [Figure 17] FIG. 2 is a cross-sectional view showing another example of the structure of the laminated glass (interlayer film) according to the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0031] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. Fig. 1 is a diagram showing a vehicle equipped with a laminated glass according to the present invention. As shown in Fig. 1, the laminated glass 1 according to the present invention is typically used as a windshield of a vehicle 100 such as an automobile. However, the laminated glass 1 according to the present invention is not limited to the windshield of the vehicle 100, and may also be a rear glass attached to the rear of the vehicle 100, a side glass attached to the side of the vehicle 100, or a roof glass attached to the ceiling of the vehicle 100.

[0032] The vehicle 100 is equipped with an information device for ensuring the driving safety of the vehicle 100. Such an information device is housed, for example, in a housing (case) 10 provided on the vehicle interior side of a laminated glass (windshield) 1. Note that, in FIG. 1, the housing (case) 10 is provided in the upper center of the laminated glass, but the location is not limited to this.

[0033] Here, the information device is a device that detects vehicles, pedestrians, obstacles, etc., present in front of the vehicle using a millimeter wave radar or the like, and may be equipped with a stereo camera, an infrared laser, etc., in addition to the millimeter wave radar. The information device may also include a communication device capable of realizing high-speed, large-capacity communication such as 4G, LTE, and 5G. For example, a communication antenna may be housed in the housing (case) 10.

[0034] In the present invention, the information device is configured to be capable of transmitting and / or receiving millimeter wave band radio waves (signals). Therefore, in the present invention, the radio wave transmittance in the millimeter wave band can be increased at least at a position of the laminated glass 1 corresponding to the housing (case) 10. In the present invention, the millimeter wave band is 30 GHz to 300 GHz, and the effect of the present invention is particularly noticeable in the range of 60 GHz to 100 GHz.

[0035] Fig. 2 is a cross-sectional view of a laminated glass according to the present invention. As shown in Fig. 2, the laminated glass 1 according to the present invention includes a first glass plate 11, a second glass plate 12, and an interlayer film 13 sandwiched between the first glass plate 11 and the second glass plate 12. In other words, the first glass plate 11 and the second glass plate 12 are bonded together with the interlayer film 13 interposed therebetween.

[0036] The first glass sheet 11 and the second glass sheet 12 are manufactured by, for example, a float method, a fusion method, or the like, but the manufacturing method is not limited to these. The laminated glass 1 can be manufactured by laminating the first glass sheet 11, the interlayer film 13, and the second glass sheet 12 in this order, evacuating them using a vacuum packaging machine, and then performing a heat-pressing treatment using an autoclave, but the manufacturing method is not limited to these.

[0037] At least one of the first glass plate 11 and the second glass plate 12 can be made of soda-lime glass, aluminosilicate glass, borosilicate glass, alkali-free glass, quartz glass, or the like. The first glass plate 11 and the second glass plate 12 can be made of either untempered glass or tempered glass. Untempered glass is made by forming molten glass into a plate shape and slowly cooling it. Tempered glass is made by forming a compressive stress layer on the surface of an untempered glass plate. At least one of the first glass plate 11 and the second glass plate 12 can be a glass plate that absorbs ultraviolet rays or infrared rays, or a colored glass plate.

[0038] The tempered glass may be either physically tempered glass such as air-cooled tempered glass or chemically tempered glass. Physically tempered glass can be tempered by generating a compressive stress layer on the glass plate surface due to the temperature difference between the glass plate surface and the inside of the glass by an operation other than slow cooling, such as rapidly cooling a glass plate uniformly heated in bending from a temperature near the softening point. Chemically tempered glass can be tempered by generating a compressive stress on the glass plate surface by an ion exchange method or the like after bending.

[0039] An example of the composition of at least one of the first glass plate 11 and the second glass plate 12 used in the present invention is glass that satisfies the following relationship in terms of oxide-based mole percentage: Examples of glass compositions include glass containing 50-80% SiO2, 0-10% B2O3, 0.1-25% Al2O3, 3-30% in total of at least one alkali metal oxide selected from the group consisting of Li2O, Na2O, and K2O, 0-25% MgO, 0-25% CaO, 0-5% SrO, 0-5% BaO, 0-5% ZrO2, and 0-5% SnO2, but are not limited to these compositions.

[0040] Another example of the composition of at least one of the first glass plate 11 and the second glass plate 12 used in the present invention may be glass that satisfies the following relationship in terms of a composition expressed in mole percentage based on oxides. 50≦SiO2≦85 0≦Al2O3≦20 4≦R2O≦22 (R2O represents the total amount of alkali metal oxides) 0≦RO≦20 (RO represents the total amount of MgO, CaO, SrO, and BaO) 0≦Na2O / R2O≦0.8 0≦K2O / R2O≦0.7

[0041] Another example of the composition of at least one of the first glass plate 11 and the second glass plate 12 used in the present invention may be glass whose composition, expressed in terms of oxide-based mole percentage, satisfies the following relationship: 72≦SiO2+Al2O3+B2O3≦98 55≦SiO2≦87 0≦Al2O3≦20 0≦B2O3≦25 0≦R2O≦5 (R2O represents the total amount of alkali metal oxides) 0≦RO≦20 (RO represents the total amount of MgO, CaO, SrO, and BaO)

[0042] The interlayer film 13 may be made of polyvinyl butyral (PVB), ethylene vinyl acetate (EVA), cycloolefin polymer, urethane resin, polyvinylidene fluoride resin (PVDF), or the like, and may contain at least one selected from this group. A thermosetting resin that is liquid before heating may also be used. That is, the interlayer film 13 may be in a layered form when the laminated glass 1 is formed, and may be liquid before the first glass sheet 11 and the second glass sheet 12 are joined together. Details of the interlayer film 13 will be described later.

[0043] In the following first to third embodiments, the specific configuration of the laminated glass 1 of the present invention and the results of simulations will be described in detail.

[0044] <Embodiment 1> FIG. 3 is a cross-sectional view of the laminated glass according to the first embodiment. As shown in FIG. 3, the laminated glass 1_1 according to the first embodiment includes a first glass plate 11, a second glass plate 12, and an intermediate film 13_1 sandwiched between the first glass plate 11 and the second glass plate 12. The intermediate film 13_1 has a laminated region having a first layer 21 in contact with the first glass plate 11, a second layer 22 in contact with the second glass plate 12, and a third layer 23 disposed between the first layer 21 and the second layer 22 in a plan view of the first glass plate 11. That is, the intermediate film 13_1 may be composed of a three-layer laminated structure of the first layer 21, the third layer 23, and the second layer 22. Here, the plan view means a case where the laminated glass 1_1 is viewed from the plate thickness direction.

[0045] In the present embodiment, the interlayer 13_1 may have a laminated region at least in a position corresponding to the housing 10 (see FIG. 1) in which the information device is housed. Specifically, the laminated glass 1_1 may have the interlayer 13_1 having the configuration according to the present embodiment at least in a position (first region) where the millimeter wave radar travels through the window glass 1, corresponding to the housing 10 (see FIG. 1), and the interlayer in the other region (second region) may be configured arbitrarily. For example, the interlayer in the other region (second region) may be configured to have the same thickness as the interlayer 13_1, with at least one of the first layer 21 and the second layer 22. In this embodiment, the entire laminated glass (windshield) 1 shown in Fig. 1 may include a laminated glass 1_1 having the configuration shown in Fig. 3. That is, in this embodiment, the entire laminated glass (windshield) 1 shown in Fig. 1 may include an interlayer 13_1 (see Fig. 3) having a laminated region.

[0046] The laminated glass 1_1 according to the present embodiment has a dielectric constant of the first glass plate 11 at a predetermined frequency F of ε g1 , the relative dielectric constant of the second glass plate 12 is ε g2 and the relative dielectric constant of the first layer 21 of the intermediate film 13_1 is ε m1 , the relative dielectric constant of the second layer 22 is ε m2 , the relative dielectric constant of the third layer 23 is ε m3 When this is set, the following relationship holds: Here, the predetermined frequency F is 60 GHz to 100 GHz, more specifically 79 GHz, and hereinafter, unless otherwise specified, each relative dielectric constant will be explained as a value at 79 GHz.

[0047] That is, the laminated glass 1_1 is ε m1 <ε g1 , ε m1 <ε g2 , ε m2 <ε g1 , ε m2 <ε g2 , ε m3 >ε m1 , εm3 >ε m2 , The above relationship exists.

[0048] Specifically, the relative dielectric constant ε of the first layer 21 and the second layer 22 of the intermediate film 13_1 m1 , ε m2 are the relative dielectric constants ε of the first glass plate 11 and the second glass plate 12, respectively. g1 , ε g2 Moreover, the relative dielectric constant ε of the third layer 23 sandwiched between the first layer 21 and the second layer 22 of the intermediate film 13_1 is lower than m3 is the relative dielectric constant ε of the first layer 21 and the second layer 22. m1 , ε m2 Higher than.

[0049] In this embodiment, by making the relative permittivities of the elements constituting the laminated glass 1_1 have such a relationship, the three layers constituting the interlayer 13_1 can be regarded as a composite material system, and the difference in the relative permittivities between the interlayer 13_1 and the first and second glass sheets 11 and 12 can be reduced macroscopically, thereby improving radio wave transmittance in the millimeter wave band. In addition, in this embodiment, since it is not necessary to remove a part of each element constituting the laminated glass 1_1, the strength required for laminated glass can be satisfied. That is, since the laminated glass 1_1 according to this embodiment has a three-layer structure of the first glass sheet 11, the second glass sheet 12, and the interlayer 13_1, the strength required for laminated glass can be satisfied.

[0050] In order to ensure strength, the thickness of the first glass plate 11 and the second glass plate 12 should be 1.1 mm or more, preferably 1.5 mm or more, and more preferably 1.8 mm or more. Although there is no particular upper limit to the thickness of the first glass plate 11 and the second glass plate 12, the weight increases as the thickness increases, so that the thickness is usually desirably 3.0 mm or less.

[0051] The laminated glass 1_1 according to the present embodiment further has a relative dielectric constant ε g1 , the relative dielectric constant ε of the second glass plate 12 g2 , and the relative dielectric constant ε of the third layer 23 of the intermediate film 13_1 m3 But, εm3 <ε g1 , ε m3 <ε g2 That is, the relative dielectric constant ε m3 is the relative dielectric constant ε of the first glass plate 11 and the second glass plate 12. g1 , ε g2 By satisfying such a relationship, the three layers constituting the interlayer 13_1 can be regarded as a composite material system, and the difference in relative dielectric constant between the interlayer 13_1 and the first and second glass sheets 11 and 12 can be reduced macroscopically, thereby improving the millimeter wave band radio wave transmittance of the laminated glass 1_1.

[0052] The laminated glass 1_1 according to the present embodiment further has a relative dielectric constant ε m1 , the relative dielectric constant ε of the second layer 22 m2 , and the relative dielectric constant ε of the third layer 23 m3 But, ε m3 / ε m1 ≧1.2, ε m3 / ε m2 ≧1.2. This can improve the millimeter wave band radio wave transmittance of the laminated glass 1_1 by 0.5 dB or more. Also, ε m3 / ε m1 ≧1.3, ε m3 / ε m2 ≧1.3, and ε m3 / ε m1 ≧1.37, ε m3 / ε m2 ≧1.37, and ε m3 / ε m1 ≧1.74, ε m3 / ε m2 ≧1.74, and ε m3 / ε m1 ≧2.11, ε m3 / ε m2 ≧2.11 may be satisfied.

[0053] In this specification, the relative dielectric constant ε of the first layer 21 is m1 The relative dielectric constant ε of the third layer 23 m3 Dielectric constant ratio: ε m3 / ε m1 Similarly, the relative dielectric constant ε m2 The relative dielectric constant ε of the third layer 23 m3 Dielectric constant ratio: ε m3 / ε m2 ". In addition, the relative dielectric constant ε m1 and the relative dielectric constant ε of the second layer 22 m2 When the dielectric constant ratio is the same as that of the dielectric constant ratio of ε m3 / ε m1 " and "Dielectric constant ratio: ε m3 / ε m2 " and "Dielectric constant ratio: ε m3 / ε m1,2 " should be written.

[0054] The laminated glass 1_1 according to the present embodiment further includes an intermediate film 13_1 having a thickness T and a third layer 23 having a thickness T m3 Then, T m3 / T≧0.1 may be satisfied. m3 / T≧0.13, and T m3 / T≧0.39, and T m3 / T≧0.66, and T m3 / T≧0.87. Since the intermediate film 13_1 includes the first layer 21, the second layer 22, and the third layer 23, T m3 / T<1, but T m3 / T≦0.95, T m3 / T<0.90. By setting such a relationship, the millimeter wave band radio wave transmittance of the laminated glass 1_1 can be increased.

[0055] From the viewpoint of ease of handling, the thickness T of the intermediate film 13_1 is preferably 0.3 mm or more, more preferably 0.5 mm or more, and even more preferably 0.7 mm or more. From the viewpoint of light weight, the thickness T is preferably 2.3 mm or less, more preferably 2.0 mm or less, and even more preferably 1.0 mm or less. The thicknesses of the intermediate films 13_2 and 13_3, which will be described later, should also be set within the above ranges.

[0056] (Simulation results) Next, the results of a simulation of the laminated glass 1_1 according to this embodiment will be described. Fig. 4 is a graph showing the results of a simulation of the laminated glass according to this embodiment, illustrating the relationship between the proportion of the third layer 23 (high dielectric layer) in the interlayer 13_1 (see Fig. 3) and the radio wave transmission characteristics. Note that the "high dielectric layer" here refers to the layer with the highest relative dielectric constant among the three layers constituting the interlayer 13_1, i.e., the third layer 23.

[0057] The conditions for the simulation shown in FIG. 4 are as follows: The dielectric constant ratio of the intermediate film 13_1 (see Figure 3) is ε m3 / ε m1,2 Specifically, the relative dielectric constant ε of the first layer 21 of the intermediate film 13_1 is set to 1.74. m1 is 2.7, and the relative dielectric constant of the second layer 22 is ε m2 2.7, and the relative dielectric constant of the third layer 23, ε m3 The relative dielectric constant ε of the first glass plate 11 was set to 4.7. g1 is set to 7, and the relative dielectric constant ε g2 was set to 7. Each relative dielectric constant is the relative dielectric constant at a frequency F=79 GHz. Here, the first glass plate 11 and the second glass plate 12 were assumed to be glasses with a composition expressed in mole percentage based on oxides, SiO2: 69.7%, Al2O3: 0.9%, MgO: 7%, CaO: 9%, TiO2: 0.05%, Na2O: 12.6%, K2O: 0.6%, and Fe2O3: 0.2%. Furthermore, the first layer 21 and the second layer 22 were assumed to be polyvinyl butyral (PVB).

[0058] The thickness of the first glass plate 11 and the second glass plate 12 was set to 2 mm. The thickness T of the intermediate film 13_1 was set to a constant value of 0.76 mm. The thickness T of the third layer 23 (high dielectric constant layer) was set to 0.76 mm. m3 The thicknesses of the first layer 21 and the second layer 22 were the same except for the case where the third layer 23 was 0 mm. The ratio of the third layer 23 (high dielectric constant layer) (T m3 / T) are 0, 0.13, 0.39, 0.66, and 0.87. The frequency in the simulation is 79 GHz. The incident angle of the 79 GHz radio wave is 67.5 degrees with respect to the main surface of the laminated glass 1_1. The results of simulating the radio wave transmission characteristics (S21) under these conditions are shown in FIG. 4.

[0059] As shown in FIG. 4, the ratio of the third layer 23 (high dielectric constant layer) (T m3 When / T) is set to 0, that is, in the conventional example, the millimeter wave transmission characteristics are low. m3 As / T increases from 0, the radio wave transmission characteristics of the millimeter wave band improve, and T m3 The millimeter wave transmission characteristics were the best when / T=0.66. m3 As / T increased, the millimeter wave transmission characteristics slightly decreased, but still showed good values. Therefore, from the simulation results shown in Figure 4, T m3 When / T is 0.13 or more, preferably 0.39 or more, it can be said that the radio wave transmission characteristics in the millimeter wave band are good. In other words, by providing the third layer 23 with a high dielectric constant between the first layer 21 and the second layer 22, the radio wave transmission characteristics in the millimeter wave band of the laminated glass are improved.

[0060] Next, the simulation results shown in Fig. 5 will be described. Fig. 5 shows simulation results showing the radio wave transmission characteristics (S21) of the laminated glass in a predetermined frequency band. The simulation conditions shown in Fig. 5 were basically the same as those shown in Fig. 4, and the incident angle of the radio waves was 67.5 degrees with respect to the main surface of the laminated glass 1_1. Fig. 5 differs from the simulation conditions in Fig. 4 in that the frequency of the radio waves incident on the laminated glass 1_1 is in the range of 60 to 100 GHz.

[0061] As shown in the simulation results in Fig. 5, the millimeter wave transmission characteristics decreased as the frequency was changed from 60 GHz to 100 GHz. In other words, this result indicates that the millimeter wave transmission characteristics decrease as the millimeter wave incident on the laminated glass 1_1 becomes higher in frequency.

[0062] In addition, the proportion of the third layer 23 (high dielectric constant layer) (T m3 If we focus on / T, T m3 When / T is 0.13 or more, the millimeter wave transmission characteristics are improved in the frequency band from 60 GHz to 100 GHz. m3 When / T is 0.13 or more, the conventional T m3 The millimeter wave transmission characteristics were improved compared to when / T was 0. Therefore, it can be said that by providing the third layer 23 with a high dielectric constant between the first layer 21 and the second layer 22, the millimeter wave transmission characteristics of the laminated glass in the range from 60 GHz to 100 GHz are improved.

[0063] Next, the simulation results shown in Fig. 6 will be described. Fig. 6 is a graph showing the simulation results of the laminated glass according to this embodiment, which shows the relationship between the ratio of the third layer 23 (high dielectric constant layer) in the interlayer film 13_1 (see Fig. 3) and the radio wave transmission characteristic (S21). In the above-mentioned Fig. 4, the dielectric constant ratio (ε m3 / ε m1,2 ) is 1.74, but in Fig. 6, the dielectric constant ratio (ε m3 / ε m1,2 ) are set to 1.20, 1.30, 1.37, 1.74, and 2.11.

[0064] Under the simulation conditions of FIG. 6, the relative dielectric constant ε m1 and the relative dielectric constant ε of the second layer 22 m2 are fixed to 2.7, and the relative dielectric constant ε m3 were set to 3.24, 3.51, 3.7, 4.7, and 5.7. In other words, the dielectric constant ratio (ε m3 / ε m1,2 ) were set to 1.20, 1.30, 1.37, 1.74, and 2.11. The other simulation conditions were the same as those in FIG.

[0065] As shown in FIG. 6, the ratio of the third layer 23 (high dielectric constant layer) (T m3 In the conventional case where / T) was set to 0, the radio wave transmission characteristics were the lowest. m3 When / T was increased from 0, the radio wave transmission characteristics improved overall. m3 / ε m1,2 ), the dielectric constant ratio (ε m3 / ε m1,2 ) increased, the radio wave transmission characteristics tended to improve.

[0066] From the simulation results shown in Fig. 6, it can be seen that the dielectric constant ratio is set to 1.20 or more (i.e., ε m3 / ε m1 ≧1.20, ε m3 / ε m2 ≧1.20), and the ratio of the third layer 23 (high dielectric constant layer) (T m3 By setting the ratio of the thickness of the dielectric constant to the thickness of the dielectric constant (T) at 0.1 or more, the radio wave transmittance in the millimeter wave band can be improved by 0.5 dB or more.

[0067] Furthermore, from the simulation results shown in Fig. 6, it is necessary to set the dielectric constant ratio to 1.30 or more (i.e., ε m3 / ε m1 ≧1.30, ε m3 / ε m2 ≧1.30), and the ratio of the thickness of the third layer 23 (high dielectric constant layer) to the thickness of the intermediate film 13_1 (T m3 By setting the ratio of the thickness of the dielectric constant to the thickness of the dielectric constant (T) at 0.1 or more, the radio wave transmittance in the millimeter wave band can be improved by 1 dB or more.

[0068] 6, the dielectric constant ratio is more preferably 1.37 or more. In addition, the dielectric constant ratio is more preferably 1.74 or more and 2.11 or less (i.e., 1.74≦ε m3 / ε m1 ≦2.11, 1.74≦ε m3 / ε m2 ≦2.11), and the ratio of the thickness of the third layer 23 (high dielectric constant layer) to the thickness of the intermediate film 13_1 (T m3 / T) to be 0.39 or more and less than 1, preferably 0.39 or more and 0.87 or less, and more preferably 0.39 or more and 0.66 or less, the radio wave transmittance in the millimeter wave band can be particularly improved.

[0069] According to the invention of the present embodiment described above, it is possible to provide laminated glass that has improved radio wave transmittance in the millimeter wave band and also satisfies the inherent strength required for laminated glass.

[0070] <Embodiment 2> Next, a second embodiment of the present invention will be described. FIG. 7 is a cross-sectional view of the laminated glass according to the second embodiment. As shown in FIG. 7, the laminated glass 1_2 according to the second embodiment includes a first glass plate 11, a second glass plate 12, and an interlayer film 13_2 sandwiched between the first glass plate 11 and the second glass plate 12. The interlayer film 13_2 has a laminated region having a first layer 31 in contact with the first glass plate 11, a second layer 32 in contact with the second glass plate 12, and a third layer 33 disposed between the first layer 31 and the second layer 32 in a plan view of the first glass plate 11. That is, the interlayer film 13_2 may be composed of a three-layer laminated structure of the first layer 31, the third layer 33, and the second layer 32. The laminated glass 1_2 according to this embodiment is different from the laminated glass 1_1 described in the first embodiment in the configuration of the interlayer film 13_2. Other than this, the laminated glass 1_1 is similar to that of the laminated glass 1_1 described in the first embodiment, so duplicated descriptions will be omitted where appropriate.

[0071] The laminated glass 1_2 according to the present embodiment has a dielectric constant of the first glass sheet 11 at a predetermined frequency F of ε g1 , the relative dielectric constant of the second glass plate 12 is ε g2 and the relative dielectric constant of the first layer 31 of the intermediate film 13_2 is ε m1 , the relative dielectric constant of the second layer 32 is ε m2 , the relative dielectric constant of the third layer 33 is ε m3 When this is set, the following relationship holds: Here, the predetermined frequency F is 60 GHz to 100 GHz, and more specifically, 79 GHz.

[0072] That is, the laminated glass 1_2 is ε m1 >ε m3 , ε m2 >ε m3 , The above relationship exists.

[0073] Furthermore, the thickness of the intermediate film 13_2 is T, and the thickness of the first layer 31 is T m1 , the thickness of the second layer 32 is T m2 When (T m1 +T m2 ) / T≧0.5 The above relationship exists.

[0074] Specifically, in the laminated glass 1_2 according to the present embodiment, the relative dielectric constant ε of the first layer 31 and the second layer 32 of the interlayer 13_2 is m1 , ε m2 and the relative dielectric constant ε m3 In addition, the thickness (T m1 +T m2 ) ratio ((T m1 +T m2 ) / T: hereinafter also referred to as the ratio of the high dielectric constant layer) is set to 0.5 or more. Note that the "high dielectric constant layer" here refers to a layer having a higher dielectric constant than the layer having the relatively lowest dielectric constant among the three layers constituting the intermediate film 13_2, i.e., the first layer 31 and the second layer 32.

[0075] In this embodiment, by making the elements of the laminated glass 1_2 have such a relationship, the dielectric constant difference at the interface can be reduced, and radio wave transmittance in the millimeter wave band can be improved. Also, in this embodiment, since it is not necessary to remove a part of each element constituting the laminated glass 1_2, the strength required for laminated glass can be satisfied. That is, since the laminated glass 1_2 according to this embodiment has a three-layer structure of the first glass sheet 11, the second glass sheet 12, and the interlayer film 13_2, the strength required for laminated glass can be satisfied.

[0076] The laminated glass 1_2 according to the present embodiment further has a relative dielectric constant ε g1 , the relative dielectric constant ε of the second glass plate 12 g2 , the relative dielectric constant ε of the first layer 31 of the intermediate film 13_2 m1, the relative dielectric constant ε of the second layer 32 m2 But, ε m1 <ε g1 , ε m1 <ε g2 , ε m2 <ε g1 , ε m2 <ε g2 That is, the relative dielectric constant ε m1 , and the relative dielectric constant ε of the second layer 32 m2 is the relative dielectric constant ε of the first glass plate 11 and the second glass plate 12. g1 , ε g2 By satisfying such a relationship, the difference in dielectric constant at the interface can be reduced, so that the reflection of millimeter wave band radio waves of the laminated glass 1_2 can be suppressed and the transmittance can be increased.

[0077] The laminated glass 1_2 according to the present embodiment further has a relative dielectric constant ε m1 , the relative dielectric constant ε of the second layer 32 m2 , and the relative dielectric constant ε of the third layer 33 m3 But, ε m1 / ε m3 ≧1.2, ε m2 / ε m3 ≧1.2. This can improve the millimeter wave band radio wave transmittance of the laminated glass 1_2 by 0.5 dB or more. Also, ε m1 / ε m3 ≧1.2, ε m2 / ε m3 ≧1.2 and ε m1 / ε m3 ≧1.3 or ε m2 / ε m3 ≧1.3, and ε m1 / ε m3 ≧1.2, ε m2 / ε m3 ≧1.2 and ε m1 / ε m3 ≧1.37 or ε m2 / ε m3 ≧1.37, and ε m1 / ε m3 ≧1.2, ε m2 / ε m3 ≧1.2 and ε m1 / ε m3 ≧1.74 or ε m2 / ε m3 ≧1.74, and ε m1 / ε m3 ≧1.2, ε m2 / ε m3 ≧1.2 and ε m1 / ε m3 ≧2.11 or ε m2 / ε m3 ≧2.11 may be satisfied.

[0078] In this specification, the relative dielectric constant ε m3 The relative dielectric constant ε of the first layer 31 m1 Dielectric constant ratio: ε m1 / ε m3 Similarly, the relative dielectric constant ε m3 The relative dielectric constant ε of the second layer 32 m2 Dielectric constant ratio: ε m2 / ε m3 ". The relative dielectric constant ε m1 and the relative dielectric constant ε of the second layer 32 m2 When the dielectric constant ratio is the same as that of the dielectric constant ratio of ε m1 / ε m3 " and "Dielectric constant ratio: ε m2 / ε m3 " and "Dielectric constant ratio: ε m1,2 / ε m3 " should be written.

[0079] The laminated glass 1_2 according to the present embodiment further has a thickness of the intermediate film 13_2 of T and a thickness of the first layer 31 of T m1 , the thickness of the second layer 32 is T m2 Then, (T m1 +T m2 ) / T≧0.66, and (T m1 +T m2 ) / T≧0.87. Since the intermediate film 13_2 includes the first layer 31, the second layer 32, and the third layer 33, (T m1 +T m2 ) / T<1, but (Tm1 +T m2 ) / T≦0.95, (T m1 +T m2 ) / T<0.90. By satisfying such a relationship, the difference in dielectric constant at the interface can be reduced, and therefore the millimeter wave band radio wave transmittance of the laminated glass 1_2 can be increased.

[0080] (Simulation results) Next, a simulation result of the laminated glass 1_2 according to the present embodiment will be described. Fig. 8 is a graph showing a simulation result of the laminated glass according to the present embodiment, which shows the relationship between the ratio of the high dielectric constant layers (first layer 31 and second layer 32) in the interlayer film 13_2 (see Fig. 7) and the radio wave transmission characteristics.

[0081] The conditions for the simulation shown in FIG. 8 are as follows. The dielectric constant ratio of the intermediate film 13_2 (see Figure 7) is ε m1,2 / ε m3 Specifically, the relative dielectric constant ε of the first layer 31 of the intermediate film 13_2 is set to 1.74. m1 is 4.7, and the relative dielectric constant of the second layer 32 is ε m2 4.7, and the relative dielectric constant of the third layer 33, ε m3 The relative dielectric constant ε of the first glass plate 11 was set to 2.7. g1 is set to 7, and the relative dielectric constant ε g2 was set to 7. It is assumed that the first glass plate 11 and the second glass plate 12 are made of the same glass as in the first embodiment, and the third layer 33 is made of polyvinyl butyral (PVB).

[0082] The thickness of the first glass plate 11 and the second glass plate 12 was set to 2 mm. The thickness T of the intermediate film 13_2 was set to a constant value of 0.76 mm. The total thickness (T m1 +T m2 ) is set to 0 mm (conventional example), 0.1 mm, 0.3 mm, 0.5 mm, and 0.66 mm, and the total of the first layer 31 and the second layer 32 (T m1 +T m2Except for the case where the thickness T of the intermediate film 13_2 is 0 mm, the thicknesses of the first layer 31 and the second layer 32, which are the high dielectric constant layers, are the same. m1 +T m2 ) ratio ((T m1 +T m2 ) / T) are 0, 0.13, 0.39, 0.66, and 0.87. The frequency in the simulation was 79 GHz. The angle of incidence of the millimeter-wave band radio waves was 67.5 degrees with respect to the main surface of the laminated glass 1_2. The results of simulating the radio wave transmission characteristics (S21) under these conditions are shown in FIG. 8.

[0083] As shown in FIG. 8, the ratio of the high dielectric constant layers (first layer 31 and second layer 32) ((T m1 +T m2 In the conventional case where the ratio of the high dielectric constant layer ((T m1 +T m2 ) / T) increased from 0. Therefore, by providing the high dielectric constant layers (first layer 31 and second layer 32) in the interlayer film 13_2, the radio wave transmission characteristics of the laminated glass are improved.

[0084] Next, the simulation results shown in Fig. 9 will be described. Fig. 9 shows the simulation results showing the radio wave transmission characteristics of laminated glass in a predetermined frequency band. The conditions for the simulation shown in Fig. 9 are basically the same as those for the simulation shown in Fig. 8. In FIG. 9, the simulation conditions are different from those in FIG. 8 in that the frequency of the millimeter wave band radio waves incident on the laminated glass 1_2 is set to 60 to 100 GHz.

[0085] As shown in the simulation results in Fig. 9, the radio wave transmission characteristics decreased as the frequency was changed from 60 GHz to 100 GHz. In other words, this result indicates that the radio wave transmission characteristics in the millimeter wave band decrease as the frequency of the radio waves incident on the laminated glass 1_2 increases.

[0086] In addition, the ratio of the high dielectric constant layers (first layer 31 and second layer 32) ((T m1 +T m2 ) / T), the ratio of high dielectric constant layers ((T m1 +T m2 When the ratio of the high dielectric constant layer ((T m1 +T m2 When the ratio of R / T) was 0.66 or more, the improvement in the millimeter wave transmission characteristics in the frequency band from 60 GHz to 100 GHz was remarkable. Therefore, it can be said that by providing the high dielectric constant layers (first layer 31 and second layer 32) in the interlayer film 13_2, the millimeter wave transmission characteristics in the frequency band from 60 GHz to 100 GHz of the laminated glass are improved.

[0087] Next, the simulation results shown in Fig. 10 will be described. Fig. 10 is a graph showing the simulation results of the laminated glass according to this embodiment, which shows the relationship between the ratio of the high dielectric constant layers (first layer 31 and second layer 32) in the interlayer film 13_2 (see Fig. 7) and the radio wave transmission characteristics. In Fig. 8 described above, the dielectric constant ratio (ε m1,2 / ε m3 ) is 1.74, while in Fig. 10, the dielectric constant ratio (ε m1,2 / ε m3 ) are set to 1.20, 1.30, 1.37, 1.74, and 2.11.

[0088] Under the simulation conditions of FIG. 10, the relative dielectric constant ε m3 is fixed to 2.7, and the relative dielectric constants ε m1 , ε m2 were set to 3.24, 3.51, 3.7, 4.7, and 5.7. In other words, the dielectric constant ratio (ε m1,2 / ε m3) were set to 1.20, 1.30, 1.37, 1.74, and 2.11. The other simulation conditions were the same as those in FIG.

[0089] As shown in Fig. 10, the ratio of the high dielectric constant layer ((T m1 +T m2 In the conventional example, when the ratio of the high dielectric constant layer ((T m1 +T m2 ) / T) from 0, the radio wave transmission characteristics in the millimeter wave band tended to improve overall. m1,2 / ε m3 ), the dielectric constant ratio (ε m1,2 / ε m3 ) increased, the millimeter wave transmission characteristics tended to improve.

[0090] From the simulation results shown in Fig. 10, the dielectric constant ratio is set to 1.20 or more (i.e., ε m1 / ε m3 ≧1.20, ε m2 / ε m3 ≧1.20), and the ratio of the high dielectric constant layers (first layer 31 and second layer 32) ((T m1 +T m2 By setting the ratio (T) / T) to be 0.5 or more and less than 1, the radio wave transparency in the millimeter wave band can be improved by 0.5 dB or more.

[0091] Furthermore, from the simulation results shown in Fig. 10, it is necessary to set the dielectric constant ratio to 1.30 or more (i.e., ε m1 / ε m3 ≧1.30, ε m2 / ε m3 ≧1.30), and the ratio of the high dielectric constant layers (first layer 31 and second layer 32) ((T m1 +T m2 By setting the ratio (T) / T) between 0.5 and 1, the radio wave transparency in the millimeter wave band can be improved by 1 dB or more.

[0092] 10, the dielectric constant ratio is preferably 1.37 or more. In addition, the dielectric constant ratio is preferably 1.74 or more and 2.11 or less (i.e., 1.74≦εm1 / ε m3 ≦2.11, 1.74≦ε m2 / ε m3 ≦2.11), and the ratio of high dielectric constant layers ((T m1 +T m2 By setting the ratio (T) / T) to 0.66 or more and less than 1, preferably 0.87 or more and less than 1, radio wave transmittance in the millimeter wave band can be particularly improved.

[0093] According to the invention of the present embodiment described above, it is possible to provide laminated glass that has improved radio wave transmittance in the millimeter wave band and also satisfies the inherent strength required for laminated glass.

[0094] <Embodiment 3> Next, a third embodiment of the present invention will be described. FIG. 11 is a cross-sectional view of a laminated glass according to the third embodiment. As shown in FIG. 11, a laminated glass 1_3 according to the third embodiment includes a first glass plate 11, a second glass plate 12, and an interlayer film 13_3 sandwiched between the first glass plate 11 and the second glass plate 12. The interlayer film 13_3 has a lamination region including a first layer 41 in contact with the first glass plate 11 and a second layer 42 in contact with the second glass plate 12 in a plan view of the first glass plate 11. The laminated glass 1_3 according to the present embodiment is different from the laminated glass 1_1 described in the first embodiment in the configuration of the interlayer film 13_3. That is, in the laminated glass 1_3 according to the present embodiment, the interlayer film 13_3 has a two-layer configuration. Other than this, it is the same as the laminated glass 1_1 described in the first embodiment, so that a duplicated description will be omitted as appropriate.

[0095] The laminated glass 1_3 according to the present embodiment has a dielectric constant of the first glass plate 11 at a predetermined frequency F of ε g1 , the relative dielectric constant of the second glass plate 12 is ε g2 and the relative dielectric constant of the first layer 41 of the intermediate film 13_3 is ε mH , the relative dielectric constant of the second layer 42 is ε mL When this is set, the following relationship holds: Here, the predetermined frequency F is 60 GHz to 100 GHz, and more specifically, 79 GHz.

[0096] That is, the laminated glass 1_3 is ε mH <ε g1 , ε mH <ε g2 , ε mL <ε g1 , ε mL <ε g2 , The above relationship exists.

[0097] Furthermore, the thickness of the intermediate film 13_3 is T, and the thickness of the first layer 41 is T mH When T mH / T≧0.3 The above relationship exists.

[0098] Specifically, in the laminated glass 1_3 according to the present embodiment, the relative dielectric constant ε mH The relative dielectric constant ε mL In addition, the thickness T of the first layer 41, which is a high dielectric constant layer, is set to be higher than the thickness T of the intermediate film 13_3. mH Proportion (T mH / T (hereinafter also referred to as the ratio of the high dielectric constant layer) is set to 0.3 or more. Note that the "high dielectric constant layer" here refers to the layer having a relatively high dielectric constant out of the two layers constituting the intermediate film 13_3, that is, the first layer 41 in this case.

[0099] In Fig. 11, the one having a relatively high dielectric constant out of the first layer 41 and the second layer 42 is designated as the first layer 41, and the one having a relatively low dielectric constant is designated as the second layer 42, but this relationship may be reversed. That is, the one having a relatively high dielectric constant out of the first layer 41 and the second layer 42 may be designated as the second layer 42, and the one having a relatively low dielectric constant may be designated as the first layer 41. In this case, the relative dielectric constant of the first layer 41 is ε mL and the relative dielectric constant of the second layer 42 is ε mH It becomes.

[0100] As described above, in this embodiment, by making the elements of the laminated glass 1_3 have such a relationship, the dielectric constant difference at the interface can be reduced, suppressing the reflection of millimeter wave band radio waves and increasing the transmittance. In addition, in this embodiment, since it is not necessary to remove a part of each element constituting the laminated glass 1_3, the strength required for laminated glass can be satisfied. That is, since the laminated glass 1_3 according to this embodiment has a three-layer structure of the first glass plate 11, the second glass plate 12, and the intermediate film 13_3, the strength required for laminated glass can be satisfied.

[0101] The laminated glass 1_3 according to the present embodiment further has a relative dielectric constant ε mH , and the relative dielectric constant ε of the second layer 42 mL But, ε mH / ε mL ≧1.2. This can improve the millimeter wave band radio wave transmittance of the laminated glass 1_3 by 0.5 dB or more. Also, ε mH / ε mL ≧1.3, and ε mH / ε mL ≧1.37, and ε mH / ε mL ≧1.74 may be satisfied.

[0102] In this specification, the relative dielectric constant ε of the second layer 42 is mL The relative dielectric constant ε of the first layer 41 mH Dielectric constant ratio: ε mH / ε mL " should be written.

[0103] The laminated glass 1_3 according to the present embodiment further has a thickness of the intermediate film 13_3 of T and a thickness of the first layer 41 of the high dielectric constant layer of T mH Then, T mH / T≧0.39, and T mH / T≧0.50, and T mH / T≧0.66, and T mH / T≧0.87. Since the intermediate film 13_3 includes the first layer 41 and the second layer 42, T mH / T<1, but T mH / T≦0.95, T mH / T<0.90. By making the laminated glass 1_3 have such a relationship, the radio wave transmittance in the millimeter wave band can be increased.

[0104] (Simulation results) Next, a simulation result of the laminated glass 1_3 according to the present embodiment will be described. Fig. 12 is a graph showing a simulation result of the laminated glass according to the present embodiment, which shows the relationship between the proportion of the first layer 41 (high dielectric layer) in the interlayer 13_3 (see Fig. 11) and the radio wave transmission characteristics.

[0105] The conditions for the simulation shown in FIG. 12 are as follows. The dielectric constant ratio of the intermediate film 13_3 (see FIG. 11) is ε mH / ε mL Specifically, the relative dielectric constant ε of the first layer 41 of the intermediate film 13_3 is set to 1.74. mH is set to 4.7, and the relative dielectric constant ε mL The relative dielectric constant ε of the first glass plate 11 was set to 2.7. g1 is set to 7, and the relative dielectric constant ε g2 was set to 7. It is assumed that the first glass plate 11 and the second glass plate 12 are made of the same glass as in the first embodiment, and the second layer 42 is made of polyvinyl butyral (PVB).

[0106] The thickness of the first glass plate 11 and the second glass plate 12 was set to 2 mm. The thickness T of the intermediate film 13_3 was set to a constant value of 0.76 mm. The thickness T of the first layer 41 (high dielectric constant layer) was set to 0.76 mm. mH The thickness was set to 0 mm (conventional example), 0.1 mm, 0.3 mm, 0.5 mm, and 0.66 mm. The ratio of the first layer 41 (high dielectric constant layer) at this time (T mH / T) were 0 (conventional example), 0.13, 0.39, 0.66, and 0.87. The frequency in the simulation was 79 GHz. The incident angle of the radio wave was 67.5 degrees with respect to the main surface of the laminated glass 1_3. The millimeter wave was set to be incident from the first glass plate 11 side. The results of simulating the radio wave transmission characteristics (S21) under these conditions are shown in FIG. 12.

[0107] As shown in FIG. 12, the ratio of the first layer 41 (high dielectric constant layer) (T mH In the conventional case where / T) was set to 0, the radio wave transmission characteristics in the millimeter wave band were low. mH As / T increases from 0, the radio wave transmission characteristics improve, and T mH The millimeter wave transmission characteristics were most improved when / T=0.87. Therefore, by providing the first layer 41, which is a high dielectric constant layer, in the interlayer film 13_3, the millimeter wave transmission characteristics of the laminated glass are improved.

[0108] Next, the simulation results shown in Fig. 13 will be described. Fig. 13 shows simulation results showing the radio wave transmission characteristics of a laminated glass in a predetermined frequency band. The simulation conditions shown in Fig. 13 are basically the same as those shown in Fig. 12. Fig. 13 differs from the simulation conditions in Fig. 12 in that the frequency of the millimeter wave band radio waves incident on the laminated glass 1_3 is 60 to 100 GHz.

[0109] As shown in the simulation results in Fig. 13, the millimeter wave transmission characteristics decreased as the frequency was changed from 60 GHz to 100 GHz. In other words, this result indicates that the millimeter wave transmission characteristics decrease as the millimeter wave incident on the laminated glass 1_3 becomes higher in frequency.

[0110] In addition, the ratio of the first layer 41 (high dielectric constant layer) (T mH If we focus on / T, T mHWhen / T was 0.39 or more and less than 1, the millimeter wave band radio wave transmission characteristics were improved in the frequency band from 60 GHz to 100 GHz. Therefore, it can be said that by providing the first layer 41, which is a high dielectric constant layer, in the interlayer film 13_3, the radio wave transmission characteristics of the laminated glass in the frequency band from 60 GHz to 100 GHz are improved.

[0111] Next, the simulation results shown in Fig. 14 will be described. Fig. 14 is a graph showing the simulation results of the laminated glass according to this embodiment, which shows the relationship between the ratio of the first layer 41 (high dielectric layer) in the interlayer 13_3 (see Fig. 11) and the radio wave transmission characteristics. In Fig. 12 described above, the dielectric constant ratio (ε mH / ε mL ) is 1.74, but in Fig. 14, the dielectric constant ratio (ε mH / ε mL ) are set to 1.20, 1.30, 1.37, 1.74, and 2.11.

[0112] Under the simulation conditions of FIG. 14, the relative dielectric constant ε mL is fixed to 2.7, and the relative dielectric constant ε mH were set to 3.24, 3.51, 3.7, 4.7, and 5.7. In other words, the dielectric constant ratio (ε mH / ε mL ) were set to 1.20, 1.30, 1.37, 1.74, and 2.11. The other simulation conditions were the same as those in FIG.

[0113] As shown in FIG. 14, the ratio of the first layer 41 (high dielectric constant layer) (T mH When / T) was set to 0 (conventional example), the radio wave transmission characteristics were low. mH When / T is increased from 0, the radio wave transmission characteristics tend to improve overall. mH / ε mL ), the dielectric constant ratio (ε mH / ε mL The best radio wave transmission characteristics were obtained when the value of 1.74.

[0114] From the simulation results shown in Fig. 14, it can be seen that the dielectric constant ratio is set to 1.20 or more (i.e., ε mH / ε mL ≧1.20), and the ratio of the first layer 41 (high dielectric constant layer) (T mH By setting the ratio of the thickness of the dielectric constant to the thickness of the dielectric constant (T) at 0.3 or more and less than 1, the radio wave transmittance in the millimeter wave band can be improved by 0.5 dB or more.

[0115] Furthermore, from the simulation results shown in Fig. 14, it is necessary to set the dielectric constant ratio to 1.30 or more (i.e., ε mH / ε mL ≧1.30), and the ratio of the first layer 41 (high dielectric constant layer) (T mH By setting the ratio of the thickness of the dielectric constant to the thickness of the dielectric constant (T) at 0.35 or more and less than 1, the radio wave transmittance in the millimeter wave band can be improved by 1 dB or more.

[0116] In addition, from the simulation results shown in FIG. 14, the dielectric constant ratio is set to 1.37 or more and 2.11 or less (i.e., 1.37≦ε mH / ε mL ≦2.11), and the ratio of the first layer 41 (high dielectric constant layer) (T mH By setting the ratio (T) to be 0.66 or more and less than 1, preferably 0.87 or more and less than 1, radio wave transmittance in the millimeter wave band can be particularly improved.

[0117] According to the invention of the present embodiment described above, it is possible to provide laminated glass that has improved radio wave transmittance in the millimeter wave band and also satisfies the inherent strength required for laminated glass.

[0118] As described in the above-mentioned first to third embodiments, in the present invention, the intermediate films 13_1 to 13_3 have a plurality of layers including a high dielectric constant layer, so that the millimeter wave transmission property of the laminated glass can be improved. That is, in the laminated glass 1 shown in FIG. 2, the first glass sheet 11 and the second glass sheet 12 have a higher relative dielectric constant than the intermediate film 13, so that the dielectric constant difference between the first glass sheet 11 and the intermediate film 13 and the dielectric constant difference between the second glass sheet 12 and the intermediate film 13 are large. Therefore, when millimeter wave radio waves pass through the laminated glass 1, the radio waves are reflected at the boundary between the first glass sheet 11 and the intermediate film 13 and the boundary between the second glass sheet 12 and the intermediate film 13, and the radio wave transmission property is reduced.

[0119] In the present invention, in order to suppress such reflection of radio waves, high dielectric constant layers are included in the interlayer films 13_1 to 13_3 (see Figs. 3, 7, and 11). In this way, by including high dielectric constant layers in the interlayer films 13_1 to 13_3, it is possible to suppress reflection of radio waves at the boundary between the first glass sheet 11 and the interlayer film 13 and at the boundary between the second glass sheet 12 and the interlayer film 13. Therefore, it is possible to increase the radio wave transmittance in the millimeter wave band in the laminated glass.

[0120] In the above-mentioned first and second embodiments, the intermediate films 13_1 and 13_2 are described as having a three-layer structure, and in the above-mentioned third embodiment, the intermediate film 13_3 is described as having a two-layer structure. However, in the present invention, the intermediate films 13_1 to 13_3 may further include layers other than these. For example, in the present invention, the intermediate films 13_1 to 13_3 may further include a sound insulation layer. The sound insulation layer may be, for example, a three-layer laminate structure in which a single core layer is sandwiched between a first skin layer and a second skin layer on both sides, and the elastic modulus of the core layer is smaller than that of the first skin layer and the second skin layer, thereby maintaining sound insulation. The elastic modulus is the value of the storage elastic modulus when a frequency dispersion measurement is performed at a strain of 0.05% using a dynamic viscoelasticity measuring device (DMA). For example, a part of the intermediate films 13_1 to 13_3 may be a sound insulation layer, and the three-layer structure of the intermediate films 13_1 and 13_2 itself may have the structure of a sound insulation layer, as described later. In this way, the sound insulation layer can be included in any of the interlayer films 13_1 to 13_3 to improve the sound insulation of the laminated glass.

[0121] In the present invention, one layer (e.g., the third layer 23 in FIG. 3) may include multiple layers. In other words, one layer (e.g., the third layer 23 in FIG. 3) may be configured by stacking multiple layers. In the present invention, one layer (e.g., the third layer 23 in FIG. 3) may be a collection of multiple layers having the same relative dielectric constant. In the present invention, one layer (e.g., the third layer 23 in FIG. 3) may be a layer in which multiple layers having different relative dielectric constants are assembled. In this case, the dielectric constant of one layer (eg, third layer 23 in FIG. 3) is the average of the multiple layers having different dielectric constants.

[0122] In the present invention, the intermediate films 13_1 to 13_3 can be composed of at least one selected from polyvinyl butyral (PVB), ethylene vinyl acetate (EVA) cycloolefin polymer, urethane resin, polyvinylidene fluoride resin (PVDF), etc., as described above. The relative dielectric constant of the intermediate films 13_1 to 13_3 may be adjusted by the material used for the intermediate films 13_1 to 13_3. The relative dielectric constant of the intermediate films 13_1 to 13_3 may also be adjusted by adding a high dielectric constant filler to the above-mentioned PVB, EVA, etc. In other words, the layer with a high relative dielectric constant among the layers constituting the intermediate films 13_1 to 13_3 may be formed by mixing a high dielectric constant filler with a resin material (PVB, EVA, etc.). Examples of the high dielectric constant filler include glass frit, ceramics (aluminum nitride, cordierite, barium titanate (BaTiO3), etc.), titania (TiO2), polybutylene terephthalate, polyvinylidene fluoride, alumina (Al2O3), etc. More specifically, the intermediate films 13_1 to 13_3 may contain at least one selected from the group consisting of Al2O3, TiO2, SiO2, ZrO2, YSZ, SnO2, forsterite, cordierite, steatite, barium magnesium niobate, barium neodymium titanate, lead zirconate titanate (PZT), borosilicate glass, alkali-free glass, glass fiber, soda lime glass, phosphate glass, BaTiO3, SrTiO3, BaSrTiO3, aluminum nitride, and MnO2, in order to adjust the relative dielectric constant.

[0123] FIG. 15 is a table for explaining an example of a dielectric material made of PVB and alumina. The table shown in FIG. 15 shows the relationship between the volume fraction of alumina and the relative dielectric constant of a dielectric material when alumina, which is a filler, is added to PVB to make a dielectric material. In the example shown in FIG. 15, the relative dielectric constant of each dielectric material is calculated by setting the relative dielectric constant of PVB to 2.7 and the relative dielectric constant of alumina to 10. Note that the relative dielectric constant of alumina and the relative dielectric constants of dielectric materials 1 to 5 described later are relative dielectric constants at 79 GHz.

[0124] As shown in the table of FIG. 15, as the volume fraction of alumina in PVB increases, the dielectric constant of the dielectric material increases. Specifically, dielectric material 1 has an alumina volume fraction of 0.07 and a dielectric constant of 3.24. Dielectric material 2 has an alumina volume fraction of 0.11 and a dielectric constant of 3.51. Dielectric material 3 has an alumina volume fraction of 0.14 and a dielectric constant of 3.7. Dielectric material 4 has an alumina volume fraction of 0.27 and a dielectric constant of 4.7. Dielectric material 5 has an alumina volume fraction of 0.41 and a dielectric constant of 5.7.

[0125] In this way, in the present invention, a dielectric material having an arbitrary relative dielectric constant can be obtained by adding a filler to a material such as PVB. Such a dielectric material can be used as the interlayer films 13_1 to 13_3 of the laminated glasses 1_1 to 1_3 described in the above-mentioned embodiments 1 to 3.

[0126] Next, another configuration example of the present invention will be described. Fig. 16 is a cross-sectional view showing another configuration example of the laminated glass according to the present invention. The laminated glass shown in Fig. 16(a) to (d) also includes a first glass plate 11, a second glass plate 12, and intermediate films 50_1 to 50_3 sandwiched between the first glass plate 11 and the second glass plate 12.

[0127] 16(a) includes an interlayer film 50_1 of laminated glass including a first layer 51, a second layer 52, and a third layer 53. A high dielectric layer 54 is provided in a part of the third layer 53. With this configuration, the millimeter wave transmittance can be partially increased in the area (first region) where the high dielectric layer 54 is provided in the plan view of the glass plate 11.

[0128] The interlayer film 50_2 of the laminated glass shown in Fig. 16(b) includes a first layer 55 and a second layer 56. A high dielectric layer 57 is inserted between the first layer 55 and the second layer 56. For example, during production, the high dielectric layer 57 is inserted into the interlayer film 50_2 from the end of the upper side of the windshield (the right side of Fig. 16(b)) and heated and pressed in an autoclave, thereby partially enhancing the millimeter wave transmission property of the upper side of the windshield. The high dielectric layer 57 is inserted so that its thickness gradually decreases with increasing distance from the end of the laminated glass.

[0129] The interlayer film 50_3 of the laminated glass shown in FIG. 16(c) includes a first layer 58 and a second layer 59. The second layer 59 is a high dielectric layer and is provided at an end of the interlayer film 50_3. In this case, for example, during manufacture, the second layer 59 (high dielectric layer) is inserted into the interlayer film 50_3 from the end of the upper side (right side of FIG. 16(c)) of the windshield so as to contact the first glass sheet 11, and then heated and pressed in an autoclave, thereby partially increasing the radio wave permeability of the upper side of the windshield. The high dielectric layer 59 is inserted so that its thickness gradually decreases with increasing distance from the end of the laminated glass.

[0130] An interlayer film 60_1 of a laminated glass shown in Fig. 16(d) includes a dielectric layer 61 and high dielectric layers 62, 63. The high dielectric layer 62 is provided between the dielectric layer 61 and the first glass plate 11, and the high dielectric layer 63 is provided between the dielectric layer 61 and the second glass plate 12. For example, the high dielectric layers 62, 63 can be formed using a high dielectric coating film. For example, during manufacturing, the high dielectric layers 62, 63 are provided at the ends of the upper side (right side of Fig. 16(d)) of the windshield so as to be in contact with the first glass plate 11 and the second glass plate, respectively, and then heated and pressed in an autoclave, thereby partially enhancing the radio wave permeability of the upper side of the windshield.

[0131] Another example of the structure of the present invention will be further described below. Fig. 17 is a cross-sectional view showing another example of the structure of the laminated glass according to the present invention, showing only the interlayer film.

[0132] An interlayer film 70_1 shown in Fig. 17(a) includes a first layer 71, a second layer 72, and a third layer 73. A high dielectric layer 74 is inserted into a part of the first layer 71. By inserting the high dielectric layer 74, the radio wave permeability of the laminated glass can be partially increased. The high dielectric layer 74 is inserted so that its thickness gradually decreases with increasing distance from the end of the interlayer film 70_1 (laminated glass).

[0133] The interlayer film 70_2 shown in Fig. 17(b) includes a first layer 71, a second layer 72, and a third layer 73. High dielectric constant layers 74, 75 are inserted into a part of the first layer 71 and a part of the second layer 72, respectively. By inserting the high dielectric constant layers 74, 75, the radio wave permeability of the laminated glass can be partially increased. The high dielectric constant layers 74, 75 are inserted so that their thickness gradually decreases with increasing distance from the end of the interlayer film 70_2 (laminated glass).

[0134] The interlayer film 70_3 shown in FIG. 17(c) includes a first layer 71, a second layer 72, and a third layer 76. In the configuration shown in FIG. 17(c), the third layer 76 is a high dielectric constant layer and also serves as a core layer of the sound insulation film. This improves the radio wave transmission and sound insulation of the laminated glass. Since the third layer 76 also serves as the core layer of the sound insulation film, a material that is relatively softer than the first layer 71 and the second layer 72 is used for it. In this case, the first layer 71 and the second layer 72 of the interlayer film 70_3 also function as skin layers, so that the radio wave transmission and sound insulation of the laminated glass for millimeter waves are improved at the same time.

[0135] The interlayer film 70_4 shown in FIG. 17(d) includes a first layer 77, a second layer 78, and a third layer 79. In the configuration shown in FIG. 17(d), the first layer 77 and the second layer 78 are each a high dielectric constant layer and also serve as a skin layer of the sound insulation film. This improves the radio wave transmission and sound insulation of the laminated glass. Since the first layer 77 and the second layer 78 also serve as a skin layer of the sound insulation film, a material that is relatively harder than the third layer 79 is used for them. In this case, the third layer 79 of the interlayer film 70_4 also functions as a core layer, so that the radio wave transmission and sound insulation of the laminated glass for millimeter waves are improved.

[0136] The interlayer film 80 shown in FIG. 17(e) includes a first layer 81, a second layer 82, and a third layer 83. The interlayer film 80 has a tapered shape in which the thickness of the interlayer film 80 becomes thinner toward the right side. Specifically, the first layer 81 and the second layer 82 of the interlayer film 80 are configured to become thinner toward the right side. In addition, a high dielectric layer 84 is inserted into a part of the first layer 81. By inserting the high dielectric layer 84, the radio wave permeability of the laminated glass can be partially increased. The interlayer film 80 shown in FIG. 17(e) can be used for laminated glass in which the first glass sheet 11 and the second glass sheet 12 are not parallel to each other (for example, a head-up display). The high dielectric layer 84 is inserted so that its thickness gradually decreases as it moves away from the end of the interlayer film 80 (laminated glass).

[0137] While the present invention has been described above in accordance with the above-described embodiment, the present invention is not limited to the configuration of the above-described embodiment, and naturally includes various modifications, alterations, and combinations that may be made by a person skilled in the art within the scope of the invention as defined in the claims of the present application.

[0138] This application claims priority based on Japanese Patent Application No. 2019-211080, filed on November 22, 2019, the disclosure of which is incorporated herein in its entirety. [Explanation of symbols]

[0139] 1, 1_1~1_3 Laminated glass 11 First glass plate 12 Second Glass Pane 13, 13_1~13_3 Interlayer 21, 31, 41 1st layer 22, 32, 42 2nd layer 23, 33 3rd layer 50_1~50_3, 60_1 Interlayer 51, 55 1st layer 52, 56, 59 2nd layer 53 3rd layer 54, 57 High dielectric constant layer 61 Dielectric layer 62, 63 High dielectric constant layer 70_1~70_4, 80 Interlayer 71, 77, 81 1st layer 72, 78, 82 2nd layer 73, 76, 83 3rd layer 74, 75, 84 High dielectric constant layer

Claims

1. A first glass plate; A second glass plate; an interlayer film sandwiched between the first glass plate and the second glass plate, the interlayer film has a lamination region including, in a plan view of the first glass plate, a first layer in contact with the first glass plate, a second layer in contact with the second glass plate, and a third layer disposed between the first layer and the second layer; A predetermined frequency between 60 GHz and 100 GHz is F [GHz], The relative dielectric constant of the first glass plate at the frequency F is ε ｇ１ , the relative dielectric constant of the second glass plate is ε ｇ２ , the relative dielectric constant of the first layer is ε ｍ１ , the relative dielectric constant of the second layer is ε ｍ２ , the relative dielectric constant of the third layer is ε ｍ３ When e ｍ１ <e ｇ１ 、e ｍ１ <e ｇ２ 、 e ｍ２ <e ｇ１ 、e ｍ２ <e ｇ２ 、 e ｍ３ >e ｍ１ 、e ｍ３ >e ｍ２ 、 The laminated glass has the above relationship.

2. The ε ｇ１ , the ε ｇ２ and the ε ｍ３ teeth, e ｍ３ <e ｇ１ 、e ｍ３ <e ｇ２ 、 The laminated glass according to claim 1 , wherein

3. The ε ｍ１ , the ε ｍ２ and the ε ｍ３ teeth, e ｍ３ / e ｍ１ ≧1.2、 e ｍ３ / e ｍ２ ≧1.2、 The laminated glass according to claim 1 or 2, which satisfies the above.

4. The thickness of the intermediate film is T, and the thickness of the third layer is T ｍ３ When T ｍ３ / T≧0.1、 The laminated glass according to any one of claims 1 to 3, which satisfies the above.

5. The ε ｍ１ , the ε ｍ２ and the ε ｍ３ teeth, e ｍ３ / e ｍ１ ≧1.37、 e ｍ３ / e ｍ２ ≧1.37、 The laminated glass according to any one of claims 1 to 4, which satisfies the above.

6. The ε ｍ１ , the ε ｍ２ and the ε ｍ３ teeth, 2.11≧e ｍ３ / e ｍ１ 、 2.11≧e ｍ３ / e ｍ２ 、 The laminated glass according to claim 5 , which satisfies the above.

7. The thickness of the intermediate film is T, and the thickness of the third layer is T ｍ３ When 0.39≦T ｍ３ / T<1、 The laminated glass according to any one of claims 1 to 6, which satisfies the above.

8. A first glass plate; A second glass plate; an interlayer film sandwiched between the first glass plate and the second glass plate, the interlayer film has a lamination region including, in a plan view of the first glass plate, a first layer in contact with the first glass plate, a second layer in contact with the second glass plate, and a third layer disposed between the first layer and the second layer; A predetermined frequency between 60 GHz and 100 GHz is F [GHz], The relative dielectric constant of the first layer at the frequency F is ε ｍ１ , the relative dielectric constant of the second layer is ε ｍ２ , the relative dielectric constant of the third layer is ε ｍ３ When e ｍ１ >e ｍ３ 、 e ｍ２ >e ｍ３ 、 The relationship is as follows: The thickness of the intermediate film in the laminated region is T, and the thickness of the first layer is T ｍ１ , the thickness of the second layer is T ｍ２ When (T ｍ１ +T ｍ２ ) / T≧0.66、 The laminated glass has the above relationship.

9. The relative dielectric constant of the first glass plate at the frequency F is ε ｇ１ , the relative dielectric constant of the second glass plate is ε ｇ２ Then, the above ε ｇ１ , the ε ｇ２ , the ε ｍ１ and the ε ｍ２ teeth, e ｍ１ <e ｇ１ 、e ｍ１ <e ｇ２ 、 e ｍ２ <e ｇ１ 、e ｍ２ <e ｇ２ 、 The laminated glass according to claim 8 , wherein

10. The ε ｍ１ , the ε ｍ２ and the ε ｍ３ teeth, e ｍ１ / e ｍ３ ≧1.2、 e ｍ２ / e ｍ３ ≧1.2、 The laminated glass according to claim 8 or 9, which satisfies the above.

11. The ε ｍ１ , the ε ｍ２ and the ε ｍ３ teeth, e ｍ１ / e ｍ３ ≧1.37、 e ｍ２ / e ｍ３ ≧1.37、 The laminated glass according to any one of claims 8 to 10, which satisfies the above.

12. The ε ｍ１ , the ε ｍ２ and the ε ｍ３ teeth, 2.11≧e ｍ１ / e ｍ３ 、 2.11≧e ｍ２ / e ｍ３ 、 The laminated glass according to claim 11, which satisfies the above.

13. The thickness T of the intermediate film, the thickness T of the first layer ｍ１ , the thickness T of the second layer ｍ２ teeth, 0.66≦(T ｍ１ +T ｍ２ ) / T<1、 The laminated glass according to any one of claims 8 to 12, which satisfies the above.

14. The laminated glass described in any one of claims 8 to 13, wherein the first layer and the second layer are constructed using a coated film having a high dielectric constant.

15. The laminated glass of claim 8, wherein the first layer and the second layer are made of a material harder than the third layer.

16. A first glass plate; A second glass plate; an interlayer film sandwiched between the first glass plate and the second glass plate, the interlayer film has a lamination region including a first layer in contact with the first glass plate and a second layer in contact with the second glass plate in a plan view of the first glass plate, A predetermined frequency between 60 GHz and 100 GHz is F [GHz], The relative dielectric constant of the first glass plate at the frequency F is ε ｇ１ , the relative dielectric constant of the second glass plate is ε ｇ２ The dielectric constant of the first layer or the second layer, whichever has a relatively higher dielectric constant, is defined as ε ｍＨ The lower dielectric constant is ε ｍＬ When e ｍＨ <e ｇ１ 、e ｍＨ <e ｇ２ 、 e ｍＬ <e ｇ１ 、e ｍＬ <e ｇ２ 、 The relationship is as follows: The thickness of the intermediate film in the laminated region is T, and the thickness of the layer having a relatively higher dielectric constant among the first layer and the second layer is T ｍＨ When T ｍＨ / T≧0.3 The laminated glass has the above relationship.

17. The ε ｍＨ and the ε ｍＬ teeth, e ｍＨ / e ｍＬ ≧1.2、 The laminated glass according to claim 16, which satisfies the above.

18. The ε ｍＨ and the ε ｍＬ teeth, e ｍＨ / e ｍＬ ≧1.37 The laminated glass according to claim 16 or 17, which satisfies the above.

19. The ε ｍＨ and the ε ｍＬ teeth, e ｍＨ / e ｍＬ ≦2.11 The laminated glass according to any one of claims 16 to 18, which satisfies the following:

20. The T and the T ｍＨ teeth, 0.66≦T ｍＨ / T<1 The laminated glass according to any one of claims 16 to 19, which satisfies the following:

21. The interlayer film, in a plan view of the first glass plate, A first region which is the laminated region; and a second region in which the intermediate film is composed of at least one of the first layer and the second layer. The laminated glass according to any one of claims 1 to 20.

22. The laminated glass according to any one of claims 1 to 21, wherein the frequency F is 79 GHz.

23. The laminated glass according to any one of claims 1 to 22, wherein the layer having a high relative dielectric constant among the layers constituting the interlayer film is formed by mixing a filler having a high dielectric constant with a resin material.

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