JP2010068154A - Heat-ray reflecting glass - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a heat-ray reflecting glass having high heat-ray reflectivity and small in transmission loss of radio waves. <P>SOLUTION: In this heat-ray reflecting glass, a heat-ray reflecting film including a conductive layer having conductivity is formed on a surface of a glass substrate. The above problem is solved by providing the heat-ray reflecting glass characterized in that the conductive layer is divided into a plurality of regions by slits; and the slits include a plurality of first slits parallel to one another and extending in a first direction, and a plurality of second slits parallel to one another, extending in a second direction without orthogonally crossing the first direction and crossing the first slits. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a heat ray reflective glass.

  A heat ray reflective glass formed by forming a coating containing a conductive layer having conductivity such as a metal on the glass surface reflects not only heat rays but also radio waves. When used as a window glass of a vehicle such as a car or a train, This hindered communication from inside to outside. In particular, it is required to transmit radio waves of mobile phones (800 MHz to 2 GHz) and keyless entries (Japan, USA: 315 MHz, Europe: 433.92 MHz).

  For this reason, as a method of transmitting radio waves for communication etc., there is a method of cutting out a coated heat ray reflective film and transmitting radio waves, etc., but it has many problems such as color unevenness due to hollowing out. Yes. As a technique for transmitting radio waves, there is an FSS (Frequency Selective Surface) structure in which two slits orthogonal to the heat ray reflective film are provided.

Patent Documents 1 and 2 describe a heat ray reflective glass having such an FSS structure.
Japanese Patent Laid-Open No. 5-50548 JP 2005-506904 A

  However, the heat ray reflective glasses described in Patent Documents 1 and 2 have a problem that radio wave permeability is remarkably deteriorated when the heat ray reflectance is increased.

  Heat-reflecting glass is used for rear glass of cars, etc., and has the function of reflecting sunlight used as heat rays and transmitting radio waves used for communication as much as possible when sunlight or radio waves from outside enters. is there.

  FIG. 1 is a plan view of a heat ray reflective glass described in Patent Documents 1 and 2 and the like. A conductive layer 101 is formed on the substrate surface of the heat ray reflective glass, and the conductive layer 101 is separated by a slit 102 and a slit 103. The slit 102 and the slit 103 are orthogonal to each other, and the width of the slit 102 and the slit 103 is G1. The conductive layer 101 separated by the slit 102 and the slit 103 is a square pattern having one side L1. In the heat ray reflective glass having such a configuration, in order to increase the heat ray reflectivity, when the length of one side L1 of the square pattern of the conductive layer 101 is increased, or when the width G1 of the slit 102 and the slit 103 is reduced, Radio wave permeability will deteriorate remarkably. Conversely, when the length of one side L1 of the square pattern of the conductive layer 101 is shortened or the width G1 of the slit 102 and the slit 103 is widened in order to increase radio wave transmission, the heat ray reflectance is significantly reduced. End up.

  Therefore, a heat ray reflective glass having high radio wave transmittance while maintaining high heat ray reflectivity is desired.

  In view of the above problems, the present invention provides a heat ray reflective glass having high radio wave permeability while maintaining high heat ray reflectivity.

  The present invention is a heat ray reflective glass in which a heat ray reflective film including a conductive conductive layer is formed on the surface of a glass substrate, wherein the conductive layer is divided into a plurality of regions by slits, A plurality of first slits extending in parallel to each other and a second slit extending in a second direction not orthogonal to the first direction and intersecting the first slits. And a slit.

  Further, the present invention is characterized in that the first slit extends in the horizontal direction.

  Further, the present invention is characterized in that the first slit extends in the vertical direction.

  In addition, the present invention is characterized in that an angle formed by the first slit and the second slit is 45 ° or less, or 135 ° or more.

  According to the present invention, the slit has a plurality of third slits parallel to each other extending in a third direction intersecting at an intersection of the first slit and the second slit, The direction is not parallel to the first direction or the second direction.

  Further, the present invention is characterized in that the third slit is orthogonal to the second slit.

  Further, the present invention has a plurality of mutually parallel fourth slits intersecting at the intersection of the first slit and the second slit, and the fourth slit is orthogonal to the first slit. It is characterized by being.

  In the heat ray reflective glass according to the present invention, the ratio of the area of the conductive layer to the sum of the area of the slit and the area of the conductive layer is 88.5% or more.

  Further, the present invention is characterized in that the heat ray reflective glass is attached to a vehicle, and a glass substrate surface of the heat ray reflective glass is attached at an angle of 30 ° or more with respect to a horizontal plane.

  ADVANTAGE OF THE INVENTION According to this invention, heat ray reflective glass with a high radio wave transmittance can be obtained, maintaining a high heat ray reflectance.

  As shown in FIG. 1, the FSS is a pattern in which conductive layers are periodically arranged on a substrate such as glass, and has an effect of transmitting or blocking radio waves having a specific frequency.

  A structure in which a pattern made of the conductive layer 101 is arranged on a substrate has a property of blocking radio waves in a specific frequency band. This specific frequency depends on the pattern formed of the conductive layer 101.

  As a method for improving the radio wave transmission loss in the FSS having such a configuration, the conductive layer shown in FIG. 2B is used in the configuration in which the pattern made of the conductive layer 101 is arranged on the substrate shown in FIG. By reducing the size of the pattern as in 101a, the resonance frequency can be shifted to the high frequency side from the solid line to the broken line shown in FIG. Thereby, it is possible to improve the transmission loss in the low frequency region lower than the resonance frequency.

[First Embodiment]
Next, the heat ray reflective glass of 1st Embodiment in this invention is demonstrated.

  The present embodiment is a heat ray reflective glass in which a heat ray reflective film including a conductive conductive film is formed on a transparent substrate such as glass, and the conductive layer is divided into a plurality of regions by slits. A plurality of mutually parallel first slits extending in one direction and a plurality of mutually parallel second slits extending in a second direction not perpendicular to the first direction and intersecting the first slit Is provided.

  In addition, the 1st direction of this invention is a direction orthogonal to the polarization plane of the desired electromagnetic wave which wants to permeate | transmit a heat ray reflective glass. That is, it is determined from the desired radio wave when designing the heat ray reflective glass of the present invention.

  Based on FIG. 3, FIG. 4, the heat ray reflective glass of this Embodiment is demonstrated.

  FIG. 3 is a plan view of the heat ray reflective glass in the present embodiment, and FIG. 4 is a cross-sectional view taken along a broken line 4A-4B in FIG.

  In the heat ray reflective glass in the present embodiment, a conductive layer 11 is formed on a glass substrate 10. The conductive layer 11 is separated by the first slit 21 and the second slit 22. The first slit 21 extends in a direction (first direction) orthogonal to the polarization plane of the radio wave, and a plurality of the first slits 21 are provided. The second slit 22 extends in the second direction without being orthogonal to the first slit 21, and intersects the first slit 21 at an intersection angle α, and similarly to the first slit 21. A plurality are provided.

  With the first slit 21 and the second slit 22, the conductive layer 11 has a configuration in which a plurality of parallelogram-shaped patterns are two-dimensionally arranged.

  The glass substrate in the present invention includes an inorganic glass substrate and a resinous organic glass substrate made of polycarbonate or the like.

(principle)
Next, the principle of the heat ray reflective glass in the present embodiment will be described based on FIG. FIG. 5A shows the case of the conductive layer 101 having a square pattern formed by the mutually orthogonal slits shown in FIG. In this case, the current flowing in the pattern of the conductive layer 101 flows in the direction indicated by the arrow, and the effective electrical length corresponds to the length of one side of the pattern of the conductive layer 101. On the other hand, in the heat ray reflective glass in the present embodiment shown in FIG. 5B, the conductive layer 11 is a parallelogram pattern, and current flows in the direction indicated by the arrow. In this case, the effective electrical length of the current flowing in this pattern is shorter than in the case of the square pattern shown in FIG. Therefore, as shown in FIG. 5C, the frequency characteristic of the parallelogram pattern shown in FIG. 5B shown by the broken line is changed from the frequency characteristic in the square pattern shown in FIG. 5A shown by the solid line. Can be improved. That is, by using the parallelogram pattern in the present embodiment shown in FIG. 5B, the resonance frequency can be shifted to the high frequency side and the transmission loss on the low frequency side can be reduced.

(Manufacturing method and materials)
Next, the manufacturing method of the heat ray reflective glass in this Embodiment is demonstrated.

  The heat ray reflective glass in this embodiment forms a heat ray reflective film including the conductive layer 11 on the glass substrate 10 as shown in FIG. 4, and then forms the first slit 21 and the second slit 22. It is produced by removing a part of the conductive layer 11 (heat ray reflective film). In this embodiment, the case where the glass substrate 10 is used as the transparent substrate is described, but a plastic substrate or the like may be used as long as it is a transparent substrate.

  Moreover, although the material which comprises the conductive layer 11 uses silver in this Embodiment, if a sheet resistance can obtain a value lower than several ohms / square, it will be specifically limited. It is not a thing. In addition, the conductive layer 11 is formed by a vacuum deposition method such as vacuum deposition or sputtering.

  Further, the first slit 21 and the second slit 22 formed in the conductive layer 11 are formed by a method such as a combination of photolithography and etching, a machining process using a milling machine, or the like in addition to a process by laser irradiation. However, any method may be used as long as a predetermined slit width can be formed.

(simulation)
Next, the simulation result of the heat ray reflective glass in the present embodiment will be described. In this simulation, electromagnetic field simulation software using a finite integration method (FIT: Finite Integration Theory) is used for two-dimensionally arranged patterns of the parallelogram conductive layer 11 in this embodiment. It was done using.

  Here, the metal area ratio indicates the ratio of the surface area of the conductive layer 11 to the surface area of the glass substrate 10. That is, in the heat ray reflective glass in which the slit is formed in the conductive layer 11, the ratio of the area of the conductive layer 11 to the sum of the area of the conductive layer 11 and the area of the slit is shown. The metal area ratio is considered to be the same value as the heat ray reflectance. The higher the metal area ratio, the higher the heat ray reflectance.

(Transmission loss due to normal incidence)
Next, in the heat ray reflective glass, the result of the simulation in the case where the polarized radio wave orthogonal to the slit is vertically incident on the heat ray reflective glass will be described. Specifically, the conductive layer 101 becomes a square pattern (referred to as a “square pattern”) by the orthogonal slits shown in FIG. 1, and the pattern of the present embodiment shown in FIG. It is the result of having performed the simulation about what becomes the pattern of a parallelogram (it calls a "parallelogram pattern") by the 2nd slit which is not orthogonal to a slit and the 1st slit. For the square pattern shown in FIG. 1, the width G1 of the vertical and horizontal slits orthogonal to each other is 0.12 mm, and one side L1 of the square pattern is 2 mm. The metal area ratio at this time is 88.9%.

  In the parallelogram pattern shown in FIG. 3 in the present embodiment, the width G2 of the first slit 21 and the second slit 22 is 0.1 mm, and the height L2 of the parallelogram is 2 mm. The crossing angle α between the first slit 21 and the second slit 22 is 45 °, and the metal area ratio at this time is 88.9% similarly to the square pattern.

  FIG. 6 shows the relationship between the frequency and transmission loss when both the square pattern and the parallelogram pattern according to the present embodiment have a metal area ratio of 88.9%. As shown in this figure, the transmission loss of the parallelogram pattern is smaller than that of the square pattern.

  Next, FIG. 7 shows the relationship between the metal area ratio and transmission loss of a square pattern and the parallelogram pattern in the present embodiment in a 2 GHz radio wave. As shown in this figure, in a region where the metal area ratio is 90% or higher, the transmission loss of the parallelogram pattern is smaller than the transmission loss of the square pattern.

  From the above, at the same metal area ratio, that is, the same heat ray reflectance, the parallelogram pattern in this embodiment is easier to transmit radio waves than the square pattern, and radio wave transmission loss with high heat ray reflectivity. Can be reduced.

(Transmission loss due to oblique incidence)
Next, transmission loss due to oblique incidence will be described. When the heat ray reflective glass in the present embodiment is used as a rear glass of an automobile, it is generally attached obliquely to the vehicle or the like. For this reason, when communication is performed using radio waves from a mobile phone or the like from the inside of the vehicle, as shown in FIG. 8, radio waves propagate and enter the heat ray reflective glass 200 in the present embodiment in a substantially horizontal direction. For this reason, the relationship between the transmission loss and the incident angle of radio waves in the heat ray reflective glass 200, that is, the vehicle body mounting angle β attached to the vehicle or the like becomes important.

  FIG. 9 shows the relationship between the vehicle body mounting angle β and the transmission loss in the square pattern and the parallelogram pattern in the present embodiment. Here, the transmission loss is the average of 0.25 to 2 GHz radio waves when the radio waves are vertically polarized TM waves, and the vehicle body mounting angle β is based on the horizontal direction of 0 °. Is the angle. From this figure, when radio waves are obliquely incident, the parallelogram pattern according to the present embodiment has less transmission loss than the square pattern, particularly when the vehicle body mounting angle β is 30 ° or more. Is significantly improved. Therefore, even with obliquely incident radio waves, the parallelogram pattern in this embodiment is easier to transmit radio waves than the square pattern, and it is possible to reduce radio wave transmission loss with high heat ray reflectivity. It is.

(Slit crossing angle)
Next, the relationship between the intersection angle α between the first slit 21 and the second slit 22 and the transmission loss of the heat ray reflective glass in the present embodiment will be described. That is, in the state where the width G2 of the first slit 21 and the second slit 22 shown in FIG. 3 is 0.1 mm, and the parallelogram height L2 of the pattern of the conductive layer 11 is constant at 2 mm, The relationship between the intersection angle α and the transmission loss when the value of α is changed will be described.

  FIG. 10 shows a shape example of a parallelogram pattern of the conductive layer 11 when the crossing angle α between the first slit 21 and the second slit 22 is changed. FIG. 10A is an example of a pattern shape when the intersection angle α is 20 °, and FIG. 10B is an example of a pattern shape when the intersection angle α is 45 °. ) Is an example of a pattern shape when the intersection angle α is 60 °.

  FIG. 11 is a correlation diagram of the crossing angle α of the first slit 21 and the second slit 22 in the vertical polarization, the metal area ratio (R), and the transmission loss. FIG. FIG. 6 is a correlation diagram between an intersection angle α of one slit 21 and a second slit 22, a metal area ratio (R), and a transmission loss. The transmission loss is an average value of radio waves of 0.25 to 2 GHz. As shown in FIG. 11, in the vertically polarized wave, the transmission loss decreases as the crossing angle α becomes sharper. In particular, when the crossing angle α is 45 ° or less, the transmission loss becomes a value of a practical level or more. Therefore, in the case of vertical polarization, the crossing angle α between the first slit 21 and the second slit is preferably 45 ° or less (or 135 ° or more).

  On the other hand, as shown in FIG. 12, in the horizontal polarization, the transmission loss increases as the crossing angle α becomes sharper, contrary to the vertical polarization. When considering the combined use of vertically polarized waves and horizontally polarized waves, the crossing angle α is preferably 35 ° or more (or 145 ° or less).

  FIG. 13 shows the relationship between the metal area ratio and transmission loss of the square pattern and the parallelogram pattern in the present embodiment. The transmission loss is an average value of radio waves of 0.25 to 2 GHz, and the square pattern has a slit width G1 shown in FIG. 1 of 0.1 mm, and the length of one side of the square pattern of the conductive layer 101. L1 is set to 1.2, 1.4, 1, 6, 1.8, and 2.0 mm. As shown in this figure, when the metal area ratio is 88.5% or more, the vertical polarization characteristics of the parallelogram pattern have lower transmission loss than the characteristics of the square pattern. Furthermore, the transmission loss decreases as the metal area ratio of the parallelogram pattern increases. Therefore, the transmission loss can be reduced at a high metal area ratio by using the conductive layer 11 of the parallelogram pattern in the present embodiment with a metal area ratio of 88.5% or more in vertical polarization. it can.

[Second Embodiment]
Next, the heat ray reflective glass in 2nd Embodiment in this invention is demonstrated.

  In this embodiment, in a conductive layer formed on a transparent substrate such as glass, a plurality of mutually parallel first slits extending in a direction perpendicular to the plane of polarization of radio waves, and the first slits The first slit and the second slit intersecting at a crossing point between the plurality of mutually parallel second slits intersecting the first slit, the first slit and the second slit without intersecting with each other. The third slit is provided in a third direction that is not parallel to the second slit.

  Based on FIG. 14, the heat ray reflective glass of this Embodiment is demonstrated. FIG. 14 is a plan view of the heat ray reflective glass in the present embodiment.

  In the heat ray reflective glass in this embodiment, a conductive layer 111 is formed on a glass substrate. The conductive layer 111 is separated by the first slit 121, the second slit 122, and the third slit 123. The first slit 121 extends in a direction perpendicular to the plane of polarization of the radio wave, and a plurality of the first slits 121 are provided. The second slits 122 intersect with the first slits 121 at an angle that is not orthogonal, and a plurality of the second slits 122 are provided in the same manner as the first slits 121. The third slit 123 intersects with the first slit 121 at the intersection of the first slit 121 and the second slit 122 at an angle of the same value as the intersection angle between the first slit 121 and the second slit 122. In the same manner as the first slit 122, a plurality of slits are provided. In the present embodiment, the first slit 121 and the second slit 122 intersect at an angle of 45 °, and the first slit 121 and the third slit 123 intersect at an angle of 45 °. ing.

  By the first slit 121, the second slit 122, and the third slit 123 described above, the conductive layer 111 has a configuration in which a plurality of isosceles triangular patterns are two-dimensionally arranged.

(Transmission loss due to normal incidence)
Next, in the heat ray reflective glass, the result of the simulation in the case where the polarized radio wave orthogonal to the slit is vertically incident on the heat ray reflective glass will be described. Specifically, the conductive layer 111 is formed by the square pattern shown in FIG. 1 and the pattern of the present embodiment shown in FIG. 14, that is, the first slit 121, the second slit 122, and the third slit 123. It is the result of having performed simulation about what becomes a pattern of an isosceles triangle (it calls an "isosceles triangle pattern"). For the square pattern shown in FIG. 1, the width G1 of the vertical and horizontal slits orthogonal to each other is 0.12 mm, and one side L1 of the square pattern of the conductive layer 101 is 2 mm. The metal area ratio at this time is 88.8%. is there.

  In addition, in the isosceles triangle pattern shown in FIG. 14 in the present embodiment, the width G3 of the first slit 121, the second slit 122, and the third slit 123 is 0.1 mm, and the first slits 121 are the same. The interval L3 between them is 2 mm, and the metal area ratio is 88.8% as in the square pattern.

  FIG. 15 shows the relationship between the frequency and transmission loss when the metal area ratio is 88.8% in both the square pattern and the isosceles triangle pattern in the present embodiment. As shown in this figure, the transmission loss of the isosceles triangle pattern in this embodiment is smaller than the transmission loss of the square pattern.

  Next, FIG. 16 shows the relationship between the metal area ratio and the transmission loss in a square pattern and an isosceles triangle pattern in this embodiment in a 2 GHz radio wave. As shown in this figure, in the region where the metal area ratio is 89% or more, the transmission loss of the isosceles triangle pattern is smaller than the transmission loss of the square pattern.

  From the above, at the same metal area ratio, that is, the same heat ray reflectance, the isosceles triangle pattern in the present embodiment is easier to transmit radio waves than the square pattern, and radio wave transmission loss with high heat ray reflectivity. Can be reduced.

[Third Embodiment]
Next, the heat ray reflective glass in the 3rd Embodiment in this invention is demonstrated.

  In this embodiment, in a conductive layer formed on a transparent substrate such as glass, a plurality of mutually parallel first slits extending in the first direction and a second direction not orthogonal to the first direction A plurality of mutually parallel second slits extending to intersect with the first slit, and a plurality of mutually intersecting intersections of the first slit and the second slit and perpendicular to the first slit. In this configuration, a fourth parallel slit is provided.

  Based on FIG. 17, the heat ray reflective glass of this Embodiment is demonstrated. FIG. 17 is a plan view of the heat ray reflective glass in the present embodiment.

  In the heat ray reflective glass in this embodiment, a conductive layer 211 is formed on a glass substrate. The conductive layer 211 is separated by the first slit 221, the second slit 222, and the fourth slit 223. The first slit 221 extends in a direction orthogonal to the plane of polarization of the radio wave, and a plurality of the first slits 221 are provided. The second slit 222 intersects with the first slit 221 without being orthogonal to the first slit 221, and a plurality of the second slits 222 are provided in the same manner as the first slit 221. The fourth slit 223 intersects the first slit 221 perpendicularly at the intersection of the first slit 221 and the second slit 222, and a plurality of the fourth slits 223 are provided in the same manner as the first slit 221. . In the present embodiment, the first slit 221 and the second slit 222 intersect at an angle of 45 °.

  By the first slit 221, the second slit 222, and the fourth slit 223, the conductive layer 211 has a configuration in which a plurality of right-angled isosceles triangular patterns are two-dimensionally arranged.

(Transmission loss due to normal incidence)
Next, in the heat ray reflective glass, the result of the simulation in the case where the polarized radio wave orthogonal to the slit is vertically incident on the heat ray reflective glass will be described. Specifically, the conductive pattern is formed by the square pattern shown in FIG. 1 and the pattern of the present embodiment as shown in FIG. 17, that is, the first slit 221, the second slit 222, and the fourth slit 223. It is the result of having performed the simulation about what becomes 211 a right-angled isosceles triangle pattern (it calls a "right-angled isosceles triangle pattern"). For the square pattern shown in FIG. 1, the width G1 of the vertical and horizontal slits orthogonal to each other is 0.18 mm, and one side L1 of the square pattern of the conductive layer 101 is 2 mm. The metal area ratio at this time is 84.4%. is there.

  In the pattern of the right isosceles triangle shown in FIG. 17 in the present embodiment, the width G4 of the first slit 221, the second slit 222, and the fourth slit 223 is 0.1 mm, and the first slit 221 is used. The distance between each other and the distance L4 between the fourth slits 223 are 2 mm, and the metal area ratio at this time is 84.4% similarly to the square pattern.

  FIG. 18 shows the relationship between the frequency and transmission loss when the metal area ratio is 84.4% in both the square pattern and the isosceles right triangle pattern in the present embodiment. As shown in this figure, the transmission loss of the right isosceles triangle pattern in the present embodiment is smaller than the transmission loss of the square pattern.

  Next, FIG. 19 shows the relationship between the metal area ratio and the transmission loss in a square pattern and a right isosceles triangle pattern in this embodiment in a 2 GHz radio wave. As shown in this figure, in the region where the metal area ratio is 84% to 96%, the transmission loss of the right isosceles triangle pattern is smaller than the transmission loss of the square pattern.

  From the above, at the same metal area ratio, that is, the same heat ray reflectance, the isosceles right triangle pattern in this embodiment is easier to transmit radio waves than the square pattern, and radio wave transmission with high heat ray reflectivity is possible. Loss can be reduced.

[Fourth Embodiment]
Next, the heat ray reflective glass in 4th Embodiment in this invention is demonstrated.

  In this embodiment, in a conductive layer formed on a transparent substrate such as glass, a plurality of mutually parallel first slits extending in a direction perpendicular to the plane of polarization of radio waves, and the first slits The first slit and the second slit at the intersection of the plurality of mutually parallel second slits intersecting with the first slit and the first slit and the second slit without intersecting with each other A plurality of mutually parallel third slits that intersect the first slit at the same angle as the intersecting angle with the first slit and the first slit and the second slit intersect at right angles to the first slit A plurality of intersecting parallel fourth slits are provided.

  Based on FIG. 20, the heat ray reflective glass of this Embodiment is demonstrated. FIG. 20 is a plan view of the heat ray reflective glass in the present embodiment.

  In the heat ray reflective glass in this embodiment, a conductive layer 311 is formed on a glass substrate. The conductive layer 311 is separated by a first slit 321, a second slit 322, a third slit 323, and a fourth slit 324. The first slit 321 extends in a direction orthogonal to the plane of polarization of the radio wave, and a plurality of the first slits 321 are provided. The second slits 322 intersect with the first slits 321 at an angle of 45 ° without being orthogonal to the first slits 321, and a plurality of the second slits 322 are provided similarly to the first slits 321. ing. The third slit 323 is the first slit 321 at the intersection of the first slit 321 and the second slit 322 and an angle having the same value as the intersection angle 45 ° between the first slit 321 and the second slit 322. As with the first slit 321, a plurality of slits are provided. The fourth slit 324 intersects the first slit 321 perpendicularly at the intersection of the first slit 321 and the second slit 322, and a plurality of the fourth slits 324 are provided in the same manner as the first slit 321. .

  By the first slit 321, the second slit 322, the third slit 323, and the fourth slit 324, the conductive layer 311 has a plurality of right-angled isosceles triangular patterns arranged two-dimensionally. It is a thing of composition.

(Transmission loss due to normal incidence)
Next, in the heat ray reflective glass, the result of the simulation in the case where the polarized radio wave orthogonal to the slit is vertically incident on the heat ray reflective glass will be described. Specifically, the square pattern shown in FIG. 1 and the pattern of this embodiment as shown in FIG. 20, that is, the first slit 321, the second slit 322, the third slit 323, and the fourth pattern. This is a result of performing a simulation on the conductive layer 311 having a right isosceles triangle pattern (referred to as a “second right isosceles triangle pattern”) by the slit 324. For the square pattern shown in FIG. 1, the width G1 of the vertical and horizontal slits orthogonal to each other is 0.26 mm, and one side L1 of the square pattern of the conductive layer 101 is 2 mm. The metal area ratio at this time is 78.3%. is there.

  In the second right isosceles triangle pattern shown in FIG. 20 in the present embodiment, the width G5 of the first slit 321, the second slit 322, the third slit 323, and the fourth slit 324 is as follows. The distance L5 between the first slits 321 and the distance L5 between the third slits 321 is 2 mm, and the metal area ratio at this time is 78.3%, as in the square pattern. is there.

  FIG. 21 shows the relationship between the frequency and transmission loss when the metal area ratio is 78.3% in both the square pattern and the second isosceles triangle pattern in the present embodiment. As shown in this figure, the transmission loss of the second right isosceles triangle pattern in the present embodiment is smaller than the transmission loss of the square pattern.

  Next, FIG. 22 shows the relationship between the metal area ratio and the transmission loss in the square pattern and the second right isosceles triangle pattern in the present embodiment in a 2 GHz radio wave. As shown in this figure, in the region where the metal area ratio is 78% or more, the transmission loss of the second right isosceles triangle pattern is smaller than the transmission loss of the square pattern.

  From the above, at the same metal area ratio, that is, the same heat ray reflectance, the pattern of the second right isosceles triangle in this embodiment is easier to transmit radio waves than the square pattern, and the heat ray reflectance is high. It is possible to reduce transmission loss of radio waves.

  Next, in the square pattern shown in FIG. 1 and the second isosceles triangle pattern shown in FIG. 20 in the present embodiment, the area of the conductive layer 101 having the same metal area ratio and one square pattern is shown. And transmission loss when the area of the conductive layer 311 having the pattern of one second right isosceles triangle is equal will be described.

  As shown in FIG. 23, the metal area ratio of the square pattern shown in FIG. 23A and the metal area ratio of the second right isosceles triangle pattern shown in FIG. The length LU of one side of the unit consisting of four square patterns shown in FIG. 23 (a) and the length LU of one side of the unit consisting of four second right-angled isosceles triangle patterns shown in FIG. Are both equal. Note that the second right isosceles triangular pattern shown in FIG. 23A and the square pattern shown in FIG. 23B are two-dimensionally arranged in units. Therefore, the width G5 of the first slit 321, the second slit 322, the third slit 323, and the fourth slit 324 shown in FIG. 23A, and the first slit 102 shown in FIG. The value is different from the width G1 of the second slit 103.

  FIG. 24 shows the metal area ratio and transmission loss between the square pattern and the second right isosceles triangle pattern in the present embodiment when the area per pattern is the same in a 2 GHz radio wave. Show the relationship. As shown in this figure, the transmission loss of the second right isosceles triangle pattern is lower than the transmission loss of the square pattern.

[Fifth Embodiment]
Next, the heat ray reflective glass in 5th Embodiment in this invention is demonstrated.

  In this embodiment, in a conductive layer formed on a transparent substrate such as glass, a plurality of mutually parallel first slits extending in a direction perpendicular to the plane of polarization of radio waves, and the first slits The first slit and the second slit intersect each other at a crossing point of the plurality of mutually parallel second slits intersecting with the first slit without intersecting with the first slit and the second slit. The third slit is not parallel to the slit.

  Based on FIG. 25, the heat ray reflective glass of this Embodiment is demonstrated. FIG. 25 is a plan view of the heat ray reflective glass in the present embodiment.

  In the heat ray reflective glass in this embodiment, a conductive layer 411 is formed over a glass substrate. The conductive layer 411 is separated by a first slit 421, a second slit 422, and a third slit 423. The first slit 421 extends in a direction orthogonal to the polarization plane of the radio wave, and a plurality of the first slits 421 are provided. The second slits 422 intersect with the first slits 421 at an intersecting angle of 60 °, and a plurality of the second slits 422 are provided similarly to the first slits 421. The third slit 423 intersects the first slit 421 at the intersection of the first slit 421 and the second slit 422 at the same angle as the intersection angle 60 ° between the first slit 421 and the second slit 422. In the same manner as the first slit 421, a plurality of slits are provided.

  By the first slit 421, the second slit 422, and the third slit 423 described above, the conductive layer 411 has a configuration in which a plurality of equilateral triangular patterns are two-dimensionally arranged.

(Transmission loss due to normal incidence)
Next, in the heat ray reflective glass, the result of the simulation in the case where the polarized radio wave orthogonal to the slit is vertically incident on the heat ray reflective glass will be described. Specifically, a square pattern as shown in FIG. 1 and a pattern of the present embodiment as shown in FIG. 25, that is, a first slit 421, a second slit 422, and a third slit 423, It is the result of having performed a simulation about what the conductive layer 411 becomes a regular triangle pattern (referred to as “regular triangle pattern”). For the square pattern shown in FIG. 1, the width G1 of the vertical and horizontal slits orthogonal to each other is 0.154 mm, and one side L1 of the square pattern of the conductive layer 101 is 2 mm. The metal area ratio at this time is 86.2%. is there.

  In the equilateral triangle pattern shown in FIG. 25 in this embodiment, the width G6 of the first slit 421, the second slit 422, and the third slit 423 is 0.1 mm, and between the first slits 421. , The interval between the second slits 422 and the interval L6 between the third slits 423 are 2 mm, and the metal area ratio at this time is 86.2% as in the square pattern.

  FIG. 26 shows the relationship between the frequency and transmission loss when the metal area ratio is 86.2% in both the square pattern and the equilateral triangle pattern in the present embodiment. As shown in this figure, the transmission loss of the regular triangle pattern in the present embodiment is smaller than the transmission loss of the square pattern.

  Next, FIG. 27 shows the relationship between the metal area ratio and the transmission loss in a square pattern and a regular triangle pattern in this embodiment in a 2 GHz radio wave. As shown in this figure, in a region where the metal area ratio is 86% or more, the transmission loss of the regular triangle pattern is smaller than the transmission loss of the square pattern.

  From the above, at the same metal area ratio, that is, the same heat ray reflectance, the equilateral triangle pattern in this embodiment is easier to transmit radio waves than the square pattern, and the radio wave transmission loss is high with high heat ray reflectivity. It is possible to reduce.

  In the embodiment of the present invention, the interval between the slits and the slit width are appropriately determined according to the frequency of the desired radio wave to be transmitted. That is, if the interval between the slits is narrow, the transmission loss is reduced, but the heat ray reflecting function is deteriorated. Therefore, the interval between the slits and the slit width are determined by these balances.

  As mentioned above, although the form which concerns on implementation of this invention was demonstrated, the said content does not limit the content of invention.

Surface view of a conventional electromagnetic wave absorber Illustration of conventional electromagnetic wave absorber Surface view of the electromagnetic wave absorbing plate in the first embodiment Sectional drawing of the electromagnetic wave absorber in 1st Embodiment Explanatory drawing of the electromagnetic wave absorber in 1st Embodiment Correlation diagram of frequency and transmission loss of electromagnetic wave absorbing plate in the first embodiment Correlation diagram between metal area ratio and transmission loss of electromagnetic wave absorbing plate in first embodiment Practical example of electromagnetic wave absorbing plate in the present invention Correlation diagram of electromagnetic wave absorbing plate mounting angle and transmission loss in the first embodiment Pattern shape diagram of conductive layer of electromagnetic wave absorbing plate in first embodiment Correlation diagram between pattern shape and transmission loss of conductive layer of electromagnetic wave absorbing plate in first embodiment (vertical polarization) Correlation diagram between pattern shape and transmission loss of conductive layer of electromagnetic wave absorbing plate in first embodiment (horizontal polarization) Correlation diagram between metal area ratio and transmission loss of electromagnetic wave absorbing plate in first embodiment Surface view of electromagnetic wave absorbing plate according to second embodiment Correlation diagram of frequency and transmission loss of electromagnetic wave absorbing plate in the second embodiment Correlation diagram between metal area ratio and transmission loss of electromagnetic wave absorbing plate in second embodiment Surface view of electromagnetic wave absorbing plate according to third embodiment Correlation diagram of frequency and transmission loss of electromagnetic wave absorbing plate in the third embodiment Correlation diagram between metal area ratio and transmission loss of electromagnetic wave absorbing plate in third embodiment Surface view of electromagnetic wave absorbing plate in fourth embodiment Correlation diagram of frequency and transmission loss of electromagnetic wave absorbing plate in the fourth embodiment Correlation diagram between metal area ratio and transmission loss of electromagnetic wave absorbing plate in fourth embodiment Explanatory drawing of the electromagnetic wave absorption plate in 4th Embodiment Correlation diagram between metal area ratio and transmission loss of electromagnetic wave absorbing plate in fourth embodiment Surface view of electromagnetic wave absorbing plate according to fifth embodiment Correlation diagram of frequency and transmission loss of electromagnetic wave absorbing plate in the fifth embodiment Correlation diagram between metal area ratio and transmission loss of electromagnetic wave absorbing plate in fifth embodiment

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Transparent substrate 11 Conductive layer 21 1st slit 22 2nd slit G2 Slit width (The slit width of a 1st slit and a 2nd slit)
L2 Pattern height α of conductive layer 11 Crossing angle of first slit and second slit

Claims (9)

A heat ray reflective glass in which a heat ray reflective film including a conductive layer is formed on the surface of a glass substrate,
The conductive layer is divided into a plurality of regions by slits,
A plurality of mutually parallel first slits extending in a first direction;
A plurality of mutually parallel second slits extending in a second direction not orthogonal to the first direction and intersecting the first slit;
The heat ray reflective glass characterized by having.   2. The heat ray reflective glass according to claim 1, wherein the first slit extends in a horizontal direction.   2. The heat ray reflective glass according to claim 1, wherein the first slit extends in a vertical direction.   4. The heat ray reflective glass according to claim 1, wherein an angle formed by the first slit and the second slit is 45 ° or less, or 135 ° or more. 5.   The slit has a plurality of mutually parallel third slits extending in a third direction intersecting at an intersection of the first slit and the second slit, and the third direction is The heat ray reflective glass according to any one of claims 1 to 4, wherein neither the direction 1 nor the second direction is parallel.   6. The heat ray reflective glass according to claim 5, wherein the third slit is orthogonal to the second slit.   It has a plurality of mutually parallel 4th slits which intersect at the intersection of the 1st slit and the 2nd slit, and the 4th slit is perpendicular to the 1st slit. The heat ray reflective glass according to any one of claims 1 to 6.   In the said heat ray reflective glass, the ratio of the area of the said conductive layer with respect to the sum of the area of the said slit and the area of the said conductive layer is 88.5% or more, It is any one of Claim 1 to 7 characterized by the above-mentioned. Heat ray reflective glass.   The said heat ray reflective glass is attached to a vehicle, The glass substrate surface in the said heat ray reflective glass is attached at an angle of 30 degrees or more with respect to a horizontal surface, The one in any one of Claim 1 to 8 characterized by the above-mentioned. Heat ray reflective glass.

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