JP2011102217A - Heat ray reflecting glass plate, and method for bending the heat ray reflecting glass plate - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a heat ray reflecting glass plate capable of suppressing distortion upon bending while maintaining transmission characteristics for electromagnetic waves, and to provide a method for bending the heat ray reflecting glass plate. <P>SOLUTION: The heat ray reflecting glass plate 110 includes a heat ray reflecting film 112 and a frequency selective surface 111 which is adjacent to the heat ray reflecting film 112 on at least one side 114 and which comprises the mesh pattern 130 of a heat ray reflecting film and has a plurality of opening lines, both formed on at least one surface of a glass plate. The network comprising the heat ray reflecting film surrounded by opening lines of the mesh pattern 130 gradually or stepwise decreases from a portion of the side 114 close to the center of the glass plate toward the periphery of the glass plate. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a heat ray reflective glass plate having a heat ray reflective film and a frequency selective surface, and a method for bending a heat ray reflective glass plate.

  A glass plate with a heat ray reflective film may be used as a window glass for buildings or vehicles. A heat ray reflective film is comprised with thin films, such as a metal and a metal oxide, and transmits visible light with a wavelength shorter than infrared rays while reflecting infrared rays. Thereby, it can suppress that the heat | fever of sunlight inflows into a room | chamber interior, ensuring the outdoor visibility from the room | chamber interior.

  However, the heat ray reflective film has a tendency to reflect electromagnetic waves having a wavelength longer than that of infrared rays in addition to infrared rays. Particularly, metal and metal oxide type heat ray reflective films having high electrical conductivity have very high electromagnetic wave reflectivity. Therefore, it reflects electromagnetic waves used in broadcasting, communication, device control, etc., such as FM broadcasting, AM broadcasting, UHF broadcasting, VHF broadcasting, cellular phone, GPS (1575 MHz), and keyless entry (250 to 400 MHz) for automobiles.

  On the other hand, a frequency selective surface (FSS: Frequency Selective Surface) having a plurality of aperture lines in which a heat ray reflective film is linearly removed is conventionally known (for example, a patent) Reference 1). The frequency selective surface selectively transmits electromagnetic waves in a frequency band corresponding to the mesh pattern. As a result, it is possible to receive electromagnetic waves from outside such as FM broadcasts with the indoor antenna. Further, it is known that the smaller the size of the mesh pattern on the frequency selection surface, the better the radio wave transmission.

  By the way, generally, when manufacturing a curved glass plate having a frequency selective surface, the flat glass having the frequency selective surface is softened by heat treatment and bent into a product shape. When bending, the peripheral edge of the flat glass is supported and the flat glass is bent by its own weight, or the flat glass is press-bended.

JP 2005-506904 A

  Usually, as shown in FIG. 11, the heat ray reflective film 12 and the frequency selection surface 11 are provided adjacent to each other at least on one side 14. The frequency selection surface 11 is composed of a mesh pattern 30 of a heat ray reflective film, and has a plurality of opening lines 32 from which the heat ray reflective film is linearly removed, so that the heat ray reflectivity is lower than that of the heat ray reflective film 12. For this reason, when viewed macroscopically, the heat ray reflectivity changes abruptly in the vicinity of one side 14 that is a boundary between the frequency selection surface 11 and the heat ray reflective film 12. Further, when viewed microscopically, since there is an opening line along one side 14, a rapid change in the heat ray reflectance near one side 14 is promoted.

  In such a case, the temperature gradient in the vicinity of one side 14 becomes sharp during the heat treatment. As a result, distortion may occur along one side 14 during bending by heat treatment. This distortion was prominent at the center of one side 14, which is a portion close to the center of the glass plate.

  In order to solve this problem, it is conceivable that the mesh 31 made of the heat ray reflective film surrounded by the opening line 32 of the mesh pattern 30 is enlarged as a whole, and the heat ray reflectivity on the frequency selection surface 11 is increased. Adversely affects electromagnetic wave transmission characteristics.

  In order to solve this problem, the flat glass with a heat ray reflective film is softened by heat treatment and bent into a product shape, and then a part of the curved heat ray reflective film is removed in a linear shape and processed into a mesh pattern. To form a frequency selective surface. However, in this case, since the processing is difficult as compared with the case of processing a flat heat ray reflective film, the dimensional accuracy of the mesh pattern is deteriorated. For this reason, the electromagnetic wave transmission characteristics may be adversely affected. Further, since the curved surface is processed, the processing apparatus becomes complicated.

  The present invention has been made in view of the above problems, and provides a heat ray reflective glass plate capable of suppressing distortion during bending while maintaining the electromagnetic wave transmission characteristics, and a method of bending a heat ray reflective glass plate. The purpose is to provide.

In order to solve the above object, the heat ray reflective glass plate of the present invention comprises:
In the heat ray reflective glass plate, which is adjacent to at least one side of the heat ray reflective film, the mesh pattern of the heat ray reflective film, and a frequency selection surface having a plurality of aperture lines is provided on at least one side of the glass plate,
The mesh composed of the heat ray reflective film surrounded by the opening line of the mesh pattern gradually decreases or gradually decreases from the side near the center of the glass plate on one side toward the periphery of the glass plate. It is characterized by becoming.

In addition, the method for bending the heat ray reflective glass plate of the present invention,
The heat ray reflective glass plate described above is softened by heat treatment and bent.

  ADVANTAGE OF THE INVENTION According to this invention, the heat ray reflective glass plate which can suppress distortion at the time of bending molding, and the bending method of a heat ray reflective glass plate can be provided, maintaining the permeation | transmission characteristic of electromagnetic waves.

It is a top view of the mesh pattern in the 1st Embodiment of this invention. It is a top view of the mesh pattern in the 2nd Embodiment of this invention. It is a top view of the mesh pattern in the 3rd Embodiment of this invention. It is a top view of the mesh pattern in the 4th Embodiment of this invention. It is a top view of the mesh pattern in the 5th Embodiment of this invention. It is a flowchart of the bending method of the heat ray reflective glass plate in one Embodiment of this invention. It is explanatory drawing (1) of the bending shaping | molding of the laminated glass in one Embodiment of this invention. It is explanatory drawing (2) of the bending shaping | molding of the laminated glass in one Embodiment of this invention. It is explanatory drawing (3) of the bending shaping | molding of the laminated glass in one Embodiment of this invention. It is the permeation | transmission characteristic figure of Examples 1-2 and the comparative example 1. It is a top view of the conventional mesh pattern.

  Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings. In the drawings, the same components are denoted by the same reference numerals and description thereof is omitted.

(First embodiment)
FIG. 1 is a plan view of a mesh pattern according to the first embodiment of the present invention.

  FIG. 1 shows a heat ray reflective glass plate in which a heat ray reflective film is formed over the entire area of one side of a rectangular flat glass, and a band-shaped frequency selection surface 111 is provided on a part of the heat ray reflective film. In this heat ray reflective glass plate, the frequency selection surface 111 and the heat ray reflective film 112 are adjacent to each other with a long side (one side) 114 as a boundary. The long side (one side) 114 is linear. The center part of the long side 114 is a part close to the center of the flat glass in the long side 114.

  The frequency selection surface 111 selectively transmits electromagnetic waves in a predetermined frequency band. The frequency selection surface 111 includes a mesh pattern 130 of a heat ray reflective film, and has a plurality of opening lines 132 obtained by removing the heat ray reflective film in a linear shape. In other words, the frequency selection surface 111 has a plurality of heat ray reflective film patches surrounded by the opening lines 132 arranged in a mesh pattern. It is desirable that each patch has a rectangular shape because the processing time is short with respect to the method of removing the heat ray reflective film such as a laser processing apparatus or a cutter. However, the shape is not limited to a rectangular shape, and may be a parallelogram, a trapezoid, a circle, or the like.

  The mesh 131 of the mesh pattern 130 is composed of a patch of a heat ray reflective film. The length of each side of the mesh 131 is set to 1/20 or less of the wavelength of electromagnetic waves (hereinafter referred to as “desired electromagnetic waves”) that the frequency selective surface 111 should selectively transmit, for example, 0.2 to 20 mm. Set to

  The plurality of opening lines 132 includes a plurality of vertical lines 133 perpendicular to the long side 114 and a plurality of parallel lines 134 parallel to the long side 114. The line widths of the vertical lines 133 and the parallel lines 134 are set according to the wavelength of the desired electromagnetic wave, and are set to 10 to 1000 μm, for example.

  The interval Y1 between the parallel lines 134 is set to gradually decrease from the vicinity of the long side 114 toward the inside of the frequency selection surface 111. On the other hand, the intervals X1 of the vertical lines 133 are set at equal intervals.

  Here, the interval Y1 between the parallel lines 134 refers to the interval between the center lines of the parallel lines 134 having a predetermined line width (for example, 500 μm), and the interval X1 between the vertical lines 133 is a predetermined line width (for example, The distance between the center lines of the vertical lines 133 having 500 μm).

  In this way, the mesh 131 of the mesh pattern 130 is gradually reduced from the long side 114 toward the inside of the frequency selection surface 111. Therefore, when viewed macroscopically, the heat ray reflectance is selected from the vicinity of the long side 114. It gradually decreases toward the inside of the surface 111. Therefore, the change in the heat ray reflectance in the vicinity of the long side 114 can be moderated.

  By the way, as shown in FIG. 11, when the size of the mesh 31 of the mesh pattern 30 is constant, when viewed macroscopically, the frequency is selected from the vicinity of one side 14 that is the boundary between the frequency selection surface 11 and the heat ray reflective film 12. The heat ray reflectance does not change toward the inside of the surface 11. Accordingly, when viewed macroscopically, the heat ray reflectance changes rapidly in the vicinity of one side 14.

  In such a case, due to a rapid change in the heat ray reflectance in the vicinity of the side 14, the temperature gradient in the vicinity of the side 14 becomes abrupt during the heat treatment. As a result, distortion is likely to occur along one side 14 during bending by heat treatment.

  In the present embodiment, the mesh 131 of the mesh pattern 130 gradually decreases from the vicinity of the long side 114 toward the inside of the frequency selection surface 111, so that the average value of the size of the mesh 131 of the mesh pattern 130 can be maintained. . If the average value of the size of the mesh 131 can be maintained, the wavelength of the desired electromagnetic wave is sufficiently longer than the length of each side of the mesh 131, so that the electromagnetic wave transmission characteristics can be maintained.

  Further, in the present embodiment, the change in the heat ray reflectance near the long side 114 can be moderated, so that the temperature gradient near the long side 114 can be moderated during the heat treatment. Thereby, it can suppress that a distortion arises along the long side 114 at the time of the bending process by heat processing.

  The heat ray reflective glass plate provided with the mesh pattern 130 is softened by heat treatment and bent into a product shape by a method described later. The heat-reflective glass plate bent into the product shape is used for vehicles, buildings, etc. so that the parallel lines of the mesh pattern are horizontal to the ground and the vertical lines of the mesh pattern are perpendicular or inclined to the ground. It can be installed on the object. Thereby, the transparency of polarized waves such as vertically polarized waves, horizontally polarized waves, circularly polarized waves and elliptically polarized waves can be enhanced.

  In the present embodiment, the mesh 131 of the mesh pattern 130 is gradually reduced from the long side 114 toward the inside of the frequency selection surface, but the present invention is not limited to this. In short, the mesh 131 of the mesh pattern 130 only needs to be gradually reduced from a portion where distortion is likely to occur, that is, from a portion near the center of the glass plate on the long side 114 toward the periphery of the glass plate.

(Second Embodiment)
FIG. 2 is a plan view of a mesh pattern according to the second embodiment of the present invention.

  2 is the same as FIG. 1 except for the mesh pattern 230, and is a heat ray reflective glass plate in which the frequency selection surface 211 and the heat ray reflective film 212 are adjacent to each other with a long side (one side) 214 as a boundary.

  The plurality of opening lines 232 of the mesh pattern 230 are configured by a plurality of vertical lines 233 perpendicular to the long side 214 and a plurality of parallel lines 234 parallel to the long side 214.

  The interval Y2 between the parallel lines 234 is set so as to decrease stepwise from the long side 214 toward the inside of the frequency selection surface 211. On the other hand, the intervals X2 of the vertical lines 233 are set at equal intervals.

  In this way, since the mesh 231 of the mesh pattern 230 is gradually reduced from the long side 214 toward the inside of the frequency selection surface 211, the average value of the size of the mesh 231 of the mesh pattern 230 is maintained. be able to. Therefore, the electromagnetic wave transmission characteristics can be maintained.

  Further, since the mesh 231 of the mesh pattern 230 is gradually reduced from the long side 214 toward the inside of the frequency selection surface 211, when viewed macroscopically, the change in the heat ray reflectance near the long side 214 is observed. It can be relaxed. Thereby, the temperature gradient in the vicinity of the long side 214 can be moderated during the heat treatment. As a result, it is possible to suppress the occurrence of distortion along the long side 214 during bending by heat treatment.

  In addition, in the present embodiment, compared to the first embodiment, since many of the pitch lines of the opening lines 232 are the same, it is easy to set the processing of the mesh pattern 230.

  On the other hand, in the first embodiment, since the mesh pattern mesh gradually decreases, the temperature gradient in the vicinity of the boundary can be made gentler than that in the present embodiment, and at the time of bending by heat treatment, the boundary It can suppress more effectively that distortion arises along.

  As in the first embodiment, the heat ray reflective glass plate provided with the mesh pattern 230 may be softened by heat treatment, bent into a product shape, and then installed on an object such as a vehicle or a building. .

(Third embodiment)
FIG. 3 is a plan view of a mesh pattern according to the third embodiment of the present invention.

  FIG. 3 shows a heat ray reflective glass plate in which a heat ray reflective film is formed over the entire area of one side of a rectangular glass plate, and a rectangular frequency selection surface 311 is provided on a part of the heat ray reflective film. In this heat ray reflective glass plate, the frequency selection surface 311 and the heat ray reflective film 312 are adjacent to each other by forming an L-shaped boundary with a long side (one side) 314 and a short side (other side) 315. Corners of the long side 314 and the short side 315 are portions close to the center of the flat glass in each of the long side 314 and the short side 315.

  The frequency selection surface 311 is made of a mesh pattern 330 of a heat ray reflective film, and the mesh 331 of the mesh pattern 330 is made of a patch of a heat ray reflective film.

  The plurality of opening lines 332 of the mesh pattern 330 includes a plurality of vertical lines 333 perpendicular to the long side 314 and a plurality of parallel lines 334 parallel to the long side 314.

  The interval Y3 between the parallel lines 334 is set to gradually decrease from the long side 314 toward the inside of the frequency selection surface 311. On the other hand, the interval X3 between the vertical lines 333 is set so as to gradually decrease from the short side 315 toward the inside of the frequency selection surface 311.

  In this way, the mesh 331 of the mesh pattern 330 gradually decreases from the vicinity of the long side 314 toward the inside of the frequency selection surface 311, so that the electromagnetic wave transmission characteristics are maintained as in the first embodiment. It is possible to suppress the occurrence of distortion along the long side 314 during bending by heat treatment.

  Further, since the mesh 331 of the mesh pattern 330 gradually decreases from the short side 315 toward the inside of the frequency selection surface 311, the short side is similarly reduced during bending by heat treatment while maintaining the electromagnetic wave transmission characteristics. Generation of distortion along 315 can be suppressed.

  In the present embodiment, the mesh 331 of the mesh pattern 330 gradually decreases from the side closer to the center of the flat glass in each of the long side 314 and the short side 315 toward the inside of the frequency selection surface 311.

  As in the first embodiment, the heat ray reflective glass plate provided with the mesh pattern 330 may be softened by heat treatment, bent into a product shape, and then installed on an object such as a vehicle or a building. .

  In the present embodiment, when the mesh 331 of the mesh pattern 330 gradually decreases from the long side 314 and the short side 315 that are the boundary between the frequency selection surface 311 and the heat ray reflective film 312 toward the inside of the frequency selection surface 311. However, the present invention is not limited to this. For example, the mesh 331 of the mesh pattern 330 may gradually decrease from one of the long side 314 and the short side 315 toward the inside of the frequency selection surface 311. Further, the mesh 331 of the mesh pattern 330 may be gradually reduced from the long side 314 and / or the short side 315 toward the inside of the frequency selection surface 311.

(Fourth embodiment)
FIG. 4 is a plan view of a mesh pattern according to the fourth embodiment of the present invention.

  4 is the same as FIG. 1 except for the mesh pattern 430, and is a heat ray reflective glass plate in which the frequency selection surface 411 and the heat ray reflective film 412 are adjacent to each other with a long side (one side) 414 as a boundary.

  The plurality of opening lines 432 of the mesh pattern 430 includes a plurality of vertical lines 433 perpendicular to the long side 414 and a plurality of parallel lines 434 parallel to the long side 414.

  The interval Y4 between the parallel lines 434 is set to gradually decrease from the vicinity of the long side 414 toward the inside of the frequency selection surface 411. On the other hand, the interval X4 between the vertical lines 433 is set so as to gradually decrease from the vicinity of the central portion of the long side 414 near the center of the glass plate toward the periphery of the glass plate.

  In this way, the mesh 431 of the mesh pattern 430 gradually decreases from the vicinity of the central portion of the long side 414 toward the periphery, so that the heat treatment is performed while maintaining the electromagnetic wave transmission characteristics as in the first embodiment. It is possible to suppress the occurrence of distortion along the long side 414 at the time of bending molding by.

  In addition, in this embodiment, since the mesh 431 of the mesh pattern 430 in the vicinity of the center portion of the long side 414 can be made larger than in the first to third embodiments, the distortion is large when viewed macroscopically. It is possible to increase the heat ray reflectance in the portion where it is likely to occur. Therefore, distortion can be effectively suppressed.

  As in the first embodiment, the heat ray reflective glass plate provided with the mesh pattern 430 is softened by heat treatment, bent into a product shape, and then installed on an object such as a vehicle or a building. .

(Fifth embodiment)
FIG. 5 is a plan view of a mesh pattern in the fifth embodiment of the present invention.

  FIG. 5 is the same as FIG. 1 except for the mesh pattern 530, and is a heat ray reflective glass plate in which the frequency selection surface 511 and the heat ray reflective film 512 are adjacent to each other with a long side (one side) 514 as a boundary. The boundary is defined by a line connecting the tips of the opening lines 532 of the mesh pattern 530. In the case of FIG. 5, the long side 514 is linear.

  The plurality of opening lines 532 of the mesh pattern 530 includes a plurality of vertical lines 533 perpendicular to the long side 514 and a plurality of parallel lines 534 parallel to the long side 514.

  The interval Y5 between the parallel lines 534 is set so as to gradually decrease from the long side 514 toward the inside of the frequency selection surface 511. On the other hand, the intervals X5 of the vertical lines 533 are set at equal intervals.

  In this way, the mesh 531 of the mesh pattern 530 gradually decreases from the long side 514 toward the inside of the frequency selection surface 511, so that the average value of the size of the mesh 531 of the mesh pattern 530 is maintained. be able to. Therefore, the electromagnetic wave transmission characteristics can be maintained.

  The parallel lines 534 are arranged so that the parallel line 534 closest to the long side 514 is separated from the long side 514 by a predetermined distance L1. Here, the predetermined distance L1 means an interval between the outer edge of the parallel line 534 having a predetermined line width (for example, 50 μm) and the long side 514.

  The predetermined distance L1 is appropriately set according to the size and shape of the frequency selection surface 511, but is preferably 3 to 100 mm, and more preferably 5 to 100 mm.

  When the predetermined distance L1 is less than 3 mm, the effect of separating the parallel line 534 from the long side 514 cannot be sufficiently obtained. On the other hand, if the predetermined distance L1 exceeds 100 mm, the change in the mesh pattern 530 is too large, which adversely affects the electromagnetic wave transmission characteristics.

  Thus, since the parallel line 534 is separated from the long side 514, there is no opening line along the long side 514 as shown in FIG.

  By the way, as shown in FIG. 13, when there is an opening line along one side 14, a rapid change in the heat ray reflectance near one side 14 is promoted. For this reason, the temperature gradient in the vicinity of the side 14 becomes sharp during the heat treatment. As a result, distortion is likely to occur along one side 14 during bending by heat treatment.

  In the present embodiment, since there is no opening line along the long side 514, the temperature gradient in the vicinity of the long side 514 can be effectively moderated during the heat treatment. Therefore, distortion can be effectively suppressed from occurring along the long side 514 during bending by heat treatment.

  As in the first embodiment, the heat ray reflective glass plate provided with the mesh pattern 530 may be softened by heat treatment, bent into a product shape, and then installed on an object such as a vehicle or a building. .

  The first to fifth embodiments of the present invention have been described above. However, the present invention is not limited to the above-described embodiments, and various modifications can be made to the above-described embodiments without departing from the scope of the present invention. Modifications and substitutions can be made.

  For example, in the first to fifth embodiments, the heat ray reflective glass plate is rectangular, but the shape of the heat ray reflective glass plate is not limited, and may be, for example, a fan shape.

  In the first to fifth embodiments, the aperture line is obtained by removing the heat ray reflective film in a linear shape, but the present invention is not limited to this. For example, the opening line may be formed using a mask in which the mesh pattern is substantially inverted.

  In the first to fifth embodiments, one side that is a boundary between the frequency selection surface and the heat ray reflective film is linear, but may be arcuate. In the case of the arc shape, the plurality of opening lines of the mesh pattern include a plurality of vertical lines substantially perpendicular to the central portion near the center of the glass plate on one side, and a plurality of parallel lines substantially parallel to the central portion on one side. In this case, the parallel lines may be arranged such that the parallel line closest to one side is separated from the central part of one side by a predetermined distance. Further, in the case of an arc, the plurality of opening lines of the mesh pattern may be configured by a plurality of orthogonal lines that are substantially orthogonal to one side and a plurality of arc-shaped lines that are concentric with one side. The arcuate line closest to one side may be arranged so as to be separated from the one side by a predetermined distance.

  Next, bending forming of the heat ray reflective glass plate will be described.

  FIG. 6 is a flowchart of a method for bending a heat ray reflective glass sheet in one embodiment of the present invention.

  For example, as shown in FIG. 6, a heat ray reflective glass plate bending method includes a heat ray reflective film and a frequency selective surface that selectively transmits electromagnetic waves in a predetermined frequency band adjacent to the heat ray reflective film on at least one side. There is a step of forming the flat glass on one side (step S100) and a step of softening the flat glass provided with the heat ray reflective film and the frequency selection surface by heat treatment and bending it into a product shape (step S102).

  In step S100 of FIG. 6, first, a heat ray reflective film is formed on one surface of a flat glass.

  The flat glass is produced, for example, by a float method. The flat glass may be tempered glass that has been heat-treated after production. The flat glass may be colorless and transparent, or may be colored. The glass of the flat glass is not particularly limited, and examples thereof include soda lime glass, borosilicate glass, and quartz glass.

  The heat ray reflective film reflects infrared rays. This window glass with a heat ray reflective film can suppress the heat of sunlight from flowing into the room, and can enhance the indoor cooling effect. The heat ray reflective film preferably transmits visible light having a wavelength shorter than that of infrared rays in order to ensure visibility from the inside of the room to the outside.

  The heat ray reflective film reflects electromagnetic waves having a wavelength longer than that of infrared rays in addition to infrared rays. Therefore, FM broadcast, AM broadcast, UHF broadcast, VHF broadcast, mobile phone, GPS (1575 MHz), automobile keyless entry system (250- 400 MHz) or the like.

  As the heat ray reflective film, a metal film, a metal oxide film, a non-metal film, a dielectric film, or the like is used alone or in combination. The heat ray reflective film may be composed of a single layer or a plurality of layers.

  A general method is used for forming the heat ray reflective film, and for example, a sputtering method, a vapor deposition method, a CVD (chemical vapor deposition) method, or the like is used. The sputtering method is suitable for large-area film formation.

  The heat ray reflective film may be formed on the entire area of one side of the flat glass or may be formed on a part of the area, but is preferably formed on the entire area in order to increase the infrared reflection efficiency. .

  Next, a part of the formed heat ray reflective film is processed into a mesh pattern using a laser processing apparatus, a cutter, or the like to form a frequency selection surface. The frequency selective surface selectively transmits electromagnetic waves in a frequency band corresponding to the mesh pattern.

  As described above, the frequency selective surface adjacent to the heat ray reflective film on at least one side is formed. Since the heat ray reflective film is made of a heat ray reflective film having no opening, it can reflect infrared rays more effectively than a frequency selective surface.

  In this way, since a part of the flat heat ray reflective film is processed into a mesh pattern, the processing is easier than when a heat ray reflective film bent into a product shape is processed. Therefore, the dimensional accuracy of the mesh pattern can be increased, and the electromagnetic wave transmission characteristics can be improved.

  In the present embodiment, a part of the formed heat ray reflective film is processed into a mesh pattern to form the frequency selective surface, but the present invention is not limited to this. For example, the mesh pattern of the heat ray reflective film may be formed on one surface of the flat glass using a mask in which the mesh pattern is substantially reversed. Also in this case, since the mesh pattern is formed on a flat surface, the dimensional accuracy of the mesh pattern can be increased and the electromagnetic wave transmission characteristics can be improved.

  In step S102 of FIG. 6, the flat glass provided with the heat ray reflective film and the frequency selection surface is softened by heat treatment and bent into a product shape.

  In the present embodiment, bending of an automotive window glass will be described, but before that, the configuration of the automotive window glass will be described.

  Laminated glass and tempered glass are used for window glass for automobiles. Usually, laminated glass is used for front glass, and tempered glass is often used for rear glass and side glass. The laminated glass has an intermediate film such as PVB (polyvinyl butyral) interposed between two curved glass plates. The intermediate film plays a role of preventing glass fragments from being scattered when the curved glass plate is broken by an external impact. Tempered glass is physically strengthened having a compressive stress layer on the surface and a tensile stress layer on the inside. The strength of the tempered glass is increased by the compressive stress layer, and when it is further broken, it becomes shattered and sharp fragments cannot be formed.

  7-9 is explanatory drawing of the bending shaping | molding of the laminated glass in one Embodiment of this invention. FIG. 7 is a side view showing a state in which another flat glass is superimposed on the heat ray reflective film and the frequency selection surface provided on one surface of one flat glass. FIG. 8 is a side view showing a state in which the two flat glass sheets laminated in FIG. 7 are bent into a product shape by heat treatment. FIG. 9 is a side view showing a state in which an intermediate film is interposed between the two curved glass plates bent and formed in FIG.

  First, as shown in FIG. 7, after applying a release agent (not shown) on the frequency selection surface 111 and the heat ray reflective film 112 provided on one side of one flat glass 110, another flat glass 120 is formed. The mold is placed on the mold 140 in a superposed state. The mold 140 has the shape of the peripheral part of the product shape. In this state, the frequency selection surface 111 and the heat ray reflective film 112 are flat. The frequency selection surface 111 and the heat ray reflective film 112 may be provided on either surface of another glass plate 120 or may be provided on a plurality of surfaces.

  Next, as shown in FIG. 8, the two flat glass plates 110 and 120 that are overlapped are heated and softened in a state where the peripheral edge portion of the lower flat glass 110 is supported by the molding die 140 and overlapped. In the state, the two flat glass plates 110 and 120 are bent by their own weight. Note that press bending may be used instead of self-weight bending.

  As a result, the two flat glass plates 110 and 120 become curved glass plates 110A and 120A that are curved into a product shape. Further, the flat frequency selection surface 111 and the heat ray reflective film 112 become the frequency selection surface 111A and the heat ray reflective film 112A that are curved into a product shape.

  Subsequently, the curved glass plates 110A and 120A are cooled and separated. Thereafter, the curved glass plates 110A and 120A, the frequency selection surface 111A, and the heat ray reflective film 112A are washed to remove the release agent.

  Next, as shown in FIG. 9, an intermediate film 113 of a flexible PVB sheet is placed on the frequency selection surface 111A and the heat ray reflective film 112A provided on one surface of one curved glass plate 110A, and then the other The curved glass plates 120A are superposed and thermocompression bonded. In this way, laminated glass for automobiles is manufactured.

  In the case of tempered glass, it is bent and formed with a single plate. The glass plate is heat-treated to the vicinity of the softening point and bent by self-weight bending or press bending. Next, for example, the glass plate is rapidly cooled by blowing air onto both sides thereof. It becomes the tempered glass which has the frequency selection surface and heat ray reflective film | curve curved to the product shape.

  In addition, although this embodiment demonstrated bending | flexion shaping | molding of the window glass for motor vehicles, this invention may be applied to general window glasses, such as a window glass for construction, an aircraft, and a railway vehicle.

  EXAMPLES The present invention will be specifically described below with reference to examples, but the present invention is not limited to the following examples.

  With respect to Examples 1 and 2 and Comparative Example 1, electromagnetic wave transmission characteristics were analyzed by computer simulation using a finite integration method. Specifically, the transmission characteristics of vertically polarized waves that pass through parallel lines of the mesh pattern were analyzed. Here, the vertical polarization means a polarization in which the electric field vibrates in a direction parallel to the vertical line of the mesh pattern.

  In Example 1, the pattern is substantially the same as the mesh pattern in FIG. 1, in Example 2, the pattern is substantially the same as the mesh pattern in FIG. 2, and in Comparative Example 1, the pattern is substantially the same as the mesh pattern in FIG. A membrane and a frequency selective surface were set up. Table 1 shows the interval between the parallel lines of the mesh pattern. In the table, the interval number represents a position from the vicinity of the boundary between the heat ray reflective film and the frequency selection surface, and the smaller the interval number, the closer to the boundary. In Examples 1 and 2 and Comparative Example 1, the pitch interval of the vertical lines of the mesh pattern was set to 9.95 mm, and the line width of each line (that is, the line width of the opening line) was set to 500 μm.

実際の解析では、解析を容易にするため、図１〜図２、図１１と異なり、メッシュパターンの垂直線の数を平行線の数と同じ１１本に設定し、略正方形状の周波数選択表面が熱線反射膜で囲繞されているものとし、且つ、ガラスによる電磁波の反射等の影響を排除した。解析結果を図１０に示す。

In actual analysis, in order to facilitate the analysis, unlike FIGS. 1 to 2 and FIG. 11, the number of vertical lines of the mesh pattern is set to 11 which is the same as the number of parallel lines, and the frequency selection surface having a substantially square shape. Was surrounded by a heat ray reflective film, and the influence of reflection of electromagnetic waves by glass was excluded. The analysis result is shown in FIG.

  FIG. 10 is a transmission characteristic diagram of electromagnetic waves in Examples 1 and 2 and Comparative Example 1. In FIG. 10, the result of Example 1 is indicated by a solid line, the result of Example 2 is indicated by a one-dot chain line, and the result of Comparative Example 1 is indicated by a broken line. In FIG. 10, in each example, the transmittance of electromagnetic waves when the heat ray reflective film in the frequency selective surface region is completely removed is set to 0 dB.

  As apparent from FIG. 10, when the interval between the parallel lines of the mesh pattern is gradually reduced or gradually reduced, the average value of the interval between the parallel lines is substantially smaller than when the interval between the parallel lines is constant. If they are the same, it can be seen that the transmission characteristics of vertically polarized waves are substantially the same.

110 flat glass 110A curved glass plate 111 frequency selection surface 112 heat ray reflective film 114 long side (one side)
130 mesh pattern 131 mesh 132 opening line 133 vertical line 134 parallel line

Claims (10)

In the heat ray reflective glass plate, which is adjacent to at least one side of the heat ray reflective film, the mesh pattern of the heat ray reflective film, and a frequency selection surface having a plurality of aperture lines is provided on at least one side of the glass plate,
The mesh composed of the heat ray reflective film surrounded by the opening line of the mesh pattern gradually decreases or gradually decreases from the side near the center of the glass plate on one side toward the periphery of the glass plate. A heat ray reflective glass plate.   The plurality of opening lines are a plurality of vertical lines substantially perpendicular to a central portion of the one side that is a portion near the center of the glass plate on one side, and a plurality of substantially parallel lines to the central portion of the one side. The heat ray reflective glass plate of Claim 1 comprised by these parallel lines.   The heat ray reflective glass plate according to claim 2, wherein the interval between the parallel lines gradually decreases or gradually decreases from the one side toward the inside of the frequency selection surface.   4. The heat ray reflective glass plate according to claim 2, wherein the parallel lines are arranged so that the parallel lines closest to the one side are separated from the one side by a predetermined distance. 5.   The heat ray reflective glass plate according to any one of claims 2 to 4, wherein an interval between the vertical lines gradually decreases or gradually decreases from the central portion of the one side toward the periphery of the glass plate. . The frequency selective surface is adjacent to the heat ray reflective film on the one side and the other side,
The heat ray reflective glass plate according to any one of claims 1 to 5, wherein the mesh gradually decreases or gradually decreases from the other side toward the inside of the frequency selection surface.   The heat ray reflective glass plate according to any one of claims 1 to 6, wherein the flat glass provided with the heat ray reflective film and the frequency selection surface is softened by heat treatment, bent and curved.   The glass according to any one of claims 1 to 7, which is a laminated glass comprising a plurality of glass plates bonded via an intermediate film, including at least one glass plate provided with the heat ray reflective film and the frequency selection surface. Heat ray reflective glass plate.   The heat ray reflective glass plate according to any one of claims 1 to 7, which is a tempered glass obtained by quenching and strengthening a glass plate provided with the heat ray reflective film and the frequency selective surface after heat treatment.   A heat ray reflective glass plate according to any one of claims 1 to 6, wherein the heat ray reflective glass plate is softened by heat treatment and bent.

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