JP6295885B2 - Laminated glass, vehicles and windows - Google Patents

Description

  The present invention relates to a laminated glass including a pair of glass plates and a mesh sheet disposed between the pair of glass plates, and a vehicle and a window including the laminated glass.

  2. Description of the Related Art Conventionally, as a defroster device used for a window glass such as a front window or a rear window of a vehicle, an apparatus in which a heating wire made of tungsten wire or the like is arranged on the entire window glass is known (for example, Patent Document 1 and Patent Document 2). reference). In this prior art, a heating wire arranged on the entire window glass is energized, and the window glass is heated by resistance heating to remove fogging of the window glass or to melt snow and ice attached to the window glass. The occupant's field of view can be secured.

JP 2013-173402 A JP-A-8-72674

  In a conventional defroster device, a bonding layer and a heating wire are sandwiched between a pair of glass plates and thermocompression bonded to form a laminated glass. Moreover, as a heating wire, what consists of thin wires, such as tungsten manufactured at the separate process, was used. However, as a result of extensive studies by the present inventors, it has been found that in such a laminated glass, the diffusion and diffraction of light in a thin line adversely affects visibility. In particular, in the method of arranging the heating wire manufactured in a separate process, the arrangement pattern of the heating wire is limited to a simple shape such as a straight line or a wavy line, and the above-described adverse effects on the visibility due to the diffusion and diffraction of light become remarkable. It was.

  On the other hand, as a wiring forming method, a method of forming a conductive wiring on a base substrate by patterning using a photolithography technique is known. In this method, first, a conductive metal layer is formed on a flat base substrate by attaching a metal foil such as a copper foil, plating, sputtering, or the like. Next, a resist pattern is formed on the conductive metal layer using a photolithography technique. Then, the conductive metal layer is etched using this resist pattern as a mask. By this etching, the conductive metal layer is patterned into a pattern substantially the same as the resist pattern. This method has an advantage that even a conductive wiring having a complicated arrangement pattern can be easily formed.

  However, when a mesh sheet is formed by forming a conductive mesh on the base substrate by this method and glass plates are bonded to both sides of the mesh sheet via a bonding layer, the mesh sheet and both The problem that the joining with the glass plate of the side which the electroconductive mesh of the mesh sheet | seat of a glass plate faces becomes unstable occurred.

  The present invention has been made in consideration of the above points, and an object of the present invention is to stably and firmly join a mesh sheet and a glass plate.

The laminated glass according to the present invention is
A first glass plate and a second glass plate;
A mesh sheet disposed between the first glass plate and the second glass plate;
A first bonding layer for bonding the first glass plate and the mesh sheet, and a second bonding layer for bonding the second glass plate and the mesh sheet,
The mesh sheet has a holding layer, and a conductive mesh provided on the surface of the holding layer facing the first bonding layer,
Among the surfaces of the holding layer facing the first glass plate, at least the surface roughness of the surface to be bonded facing the first bonding layer is 0.5 μm or more and 2.5 μm or less in terms of arithmetic average roughness Ra. .

  In the laminated glass according to the present invention, the refractive index of the region on the first bonding layer side of the holding layer is between the refractive index of the region on the second bonding layer side of the holding layer and the refractive index of the first bonding layer. It may be.

  In the laminated glass according to the present invention, an easy adhesion layer may be provided on the surface of the mesh sheet on the side facing the second bonding layer.

  According to the present invention, the mesh sheet and the glass plate can be stably and firmly bonded.

FIG. 1 is a diagram for explaining an embodiment according to the present invention, and is a perspective view schematically showing a vehicle provided with a laminated glass. In particular, FIG. 1 schematically shows an automobile with laminated glass as an example of a vehicle. FIG. 2 is a view of the laminated glass as viewed from the normal direction of the plate surface. FIG. 3 is a cross-sectional view of the laminated glass of FIG. FIG. 4 is a plan view showing an example of a conductive mesh pattern. Drawing 5 is a figure for explaining an example of a manufacturing method of laminated glass. Drawing 6 is a figure for explaining an example of a manufacturing method of laminated glass. Drawing 7 is a figure for explaining an example of a manufacturing method of laminated glass. FIG. 8 is a diagram for explaining an example of a method for producing laminated glass. FIG. 9 is a diagram for explaining an example of a method for producing laminated glass. FIG. 10 is a diagram for explaining an example of a method for producing laminated glass. FIG. 11 is a diagram for explaining an example of a method for producing laminated glass. FIG. 12 is a diagram for explaining an example of a method for producing laminated glass. FIG. 13 is a view for explaining a modified example of the laminated glass. FIG. 14 is a view for explaining another modified example of the laminated glass.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings. In the drawings attached to the present specification, for the sake of illustration and ease of understanding, the scale, the vertical / horizontal dimension ratio, and the like are appropriately changed and exaggerated from those of the actual product.

  In the present specification, the terms “plate”, “sheet”, and “film” are not distinguished from each other only based on the difference in names. For example, “mesh sheet” is a concept that includes a member that can be called a plate or a film. Therefore, “mesh sheet” is a member called “mesh plate (substrate)” or “mesh film”. It cannot be distinguished only by the difference.

  In addition, “sheet surface (plate surface, film surface)” means a target sheet-like member (plate-like) when the target sheet-like (plate-like, film-like) member is viewed as a whole and globally. It refers to the surface that coincides with the plane direction of the member or film-like member.

  In addition, as used in this specification, the shape and geometric conditions and the degree thereof are specified, for example, terms such as “parallel”, “orthogonal”, “identical”, length and angle values, etc. are strictly Without being bound by meaning, it should be interpreted including the extent to which similar functions can be expected.

  FIGS. 1-12 is a figure for demonstrating one Embodiment by this invention. Among these, FIG. 1 is a diagram schematically showing an automobile equipped with a laminated glass, FIG. 2 is a diagram of the laminated glass viewed from the normal direction of the plate surface, and FIG. 3 is a diagram of FIG. It is a cross-sectional view of glass.

  As shown in FIG. 1, an automobile 1 as an example of a vehicle has window glasses such as a front window, a rear window, and a side window. Here, an example in which the front window 5 is composed of a laminated glass 10 is illustrated. The automobile 1 has a power source 7 such as a battery.

  FIG. 2 shows the laminated glass 10 viewed from the normal direction of the plate surface. Moreover, the cross-sectional view corresponding to the III-III line of the laminated glass 10 of FIG. 2 is shown in FIG. In the example shown in FIG. 3, the laminated glass 10 includes a first glass plate 11, a first bonding layer 21, a mesh sheet 40, a second bonding layer 22, and a second glass plate 12 that are laminated in this order. The mesh sheet 40 includes a base material 41, a holding layer 42 stacked on the base material 41, and a conductive mesh 30 stacked on the holding layer 42. In the example shown in FIGS. 1 and 2, the laminated glass 10 is curved. However, in FIGS. 3, 13 and 14, the laminated glass 10, 100 and 110 are illustrated in a flat plate shape.

  2 and 4, the laminated glass 10 includes a wiring portion 15 for energizing the conductive mesh 30 and a connection portion 16 that connects the conductive mesh 30 and the wiring portion 15. And have. In the illustrated example, the conductive mesh 30 is energized from the power source 7 such as a battery via the wiring portion 15 and the connection portion 16, and the conductive mesh 30 is heated by resistance heating. The heat generated in the conductive mesh 30 is transmitted to the glass plates 11 and 12, and the glass plates 11 and 12 are warmed. Thereby, the cloudiness by the dew condensation adhering to the glass plates 11 and 12 can be removed. Moreover, when snow and ice adhere to the glass plates 11 and 12, this snow and ice can be melted. Therefore, a passenger | crew's visual field is ensured favorable.

  Hereinafter, each layer of the laminated glass 10 will be described.

  First, the glass plates 11 and 12 will be described. In particular, when the glass plates 11 and 12 are used for a front window, it is preferable to use a glass plate having a high visible light transmittance so as not to obstruct the passenger's field of view. Examples of the material of the glass plates 11 and 12 include soda lime glass and blue plate glass. The glass plates 11 and 12 preferably have a transmittance in the visible light region of 90% or more. Here, the visible light transmittance of the glass plates 11 and 12 is measured within a measurement wavelength range of 380 nm to 780 nm using a spectrophotometer (“UV-3100PC” manufactured by Shimadzu Corporation, JISK0115 compliant product). Of the transmittance at each wavelength. The visible light transmittance may be lowered by coloring a part or the whole of the glass plates 11 and 12. In this case, it is possible to block direct sunlight and to make it difficult to visually recognize the inside of the vehicle from outside the vehicle.

  Moreover, it is preferable that the glass plates 11 and 12 have a thickness of 1 mm or more and 5 mm or less. With such a thickness, the glass plates 11 and 12 excellent in strength and optical characteristics can be obtained.

  Next, the bonding layers 21 and 22 will be described. The first bonding layer 21 is disposed between the first glass plate 11 and the mesh sheet 40 and bonds the first glass plate 11 and the mesh sheet 40 to each other. The second bonding layer 22 is disposed between the second glass plate 12 and the mesh sheet 40 and bonds the second glass plate 12 and the mesh sheet 40 to each other.

  As the bonding layers 21 and 22, layers made of materials having various adhesiveness or tackiness can be used. The bonding layers 21 and 22 preferably have a high visible light transmittance. As a typical joining layer, the layer which consists of polyvinyl butyral (PVB) can be illustrated. The thicknesses of the bonding layers 21 and 22 are preferably 0.15 mm or more and 1 mm or less, respectively.

  The laminated glass 10 is not limited to the illustrated example, and may be provided with other functional layers expected to exhibit a specific function. Further, one functional layer may exhibit two or more functions. For example, the glass plates 11 and 12 of the laminated glass 10, the bonding layers 21 and 22, and the base material 41 of the mesh sheet 40 to be described later. You may make it provide a function to at least one. Examples of functions that can be imparted to the laminated glass 10 include antireflection (AR) function, hard coat (HC) function having scratch resistance, infrared shielding (reflection) function, ultraviolet shielding (reflection) function, and polarization function. An antifouling function and the like can be exemplified.

  Next, the mesh sheet 40 will be described. The mesh sheet 40 includes a holding layer 42 and a conductive mesh 30 provided on a surface 42 a of the holding layer 42 facing the first bonding layer 21. In particular, in the example illustrated in FIG. 3, the mesh sheet 40 further includes a base material 41 that supports the holding layer 42 and the conductive mesh 30. Furthermore, the mesh sheet 40 includes a wiring portion 15 for energizing the conductive mesh 30 and a connection portion 16 that connects the conductive mesh 30 and the wiring portion 15. The mesh sheet 40 has substantially the same planar dimensions as the glass plates 11 and 12 and may be arranged over the entire laminated glass 10 or only on a part of the laminated glass 10 such as the front portion of the driver's seat. May be.

  The base material 41 functions as a base material that supports the holding layer 42 and the conductive mesh 30. The base material 41 is an electrically insulating substrate that is transparent in general terms and transmits a wavelength (380 nm to 780 nm) in the visible light wavelength band. The base material 41 may be made of any material as long as it transmits visible light and can appropriately support the holding layer 42 and the conductive mesh 30. For example, polyethylene terephthalate, polyethylene naphthalate, polycarbonate, polystyrene And cyclic polyolefin. In addition, the substrate 41 preferably has a thickness of 0.03 mm or more and 0.15 mm or less in consideration of light transmittance, appropriate supportability of the holding layer 42 and the conductive mesh 30, and the like.

  The holding layer 42 has a function of improving the bondability between the mesh sheet 40 and the first glass plate 11. The holding layer 42 can be formed by, for example, laminating a transparent electrically insulating resin sheet on the base material 41 or applying a resin material on the base material 41. Of the surface (upper surface) 42a facing the first glass plate 11 of the holding layer 42, at least the surface roughness of the bonded surface 42a1 facing the first bonding layer 21 is 0.5 μm in terms of arithmetic average roughness Ra. It is 2.5 μm or less. More preferably, the surface roughness of the bonded surface 42a1 may be greater than 1 μm and less than 2 μm in arithmetic average roughness Ra. Here, the arithmetic average roughness Ra is an arithmetic average roughness Ra defined by JIS B 0601 (1994). The holding layer 42 having such a surface roughness has fine irregularities on at least the bonded surface 42a1 of the upper surface 42a of the holding layer 42. Then, the first bonding layer 21 enters the fine irregularities, and the first bonding layer 21 is cured in this state, so that the bonded surface 42a1 of the holding layer 42 and the first bonding layer 21 are bonded by the so-called anchor effect. Are firmly joined. That is, according to the holding layer 42 including the bonded surface 42a1 having a surface roughness of 0.5 μm or more and 2.5 μm or less in arithmetic average roughness Ra, the bonded surface 42a1 of the holding layer 42 and the first bonding layer 21 Can be effectively improved. As a result, the mesh sheet 40 and the first glass plate 11 are firmly bonded via the first bonding layer 21. As such a holding layer 42, for example, a filler-rich layer (hollow silica or the like) that easily breaks up and breaks down can be used. In addition, the thickness of the holding layer 42 can be set to 1 μm or more and 100 μm or less in consideration of light transmittance, bondability between the mesh sheet 40 and the first glass plate 11, and the like. Preferably, the thickness of the holding layer 42 can be 1 μm or more and 15 μm or less.

  FIG. 4 is a plan view showing an example of an arrangement pattern of the conductive mesh 30. The conductive mesh 30 is energized from the power source 7 such as a battery through the wiring portion 15 and the connection portion 16 and generates heat by resistance heating. And when this heat is transmitted to the glass plates 11 and 12, the glass plates 11 and 12 are warmed.

  As shown in FIG. 4, the conductive mesh 30 is a mesh member that defines a large number of openings 33. The conductive mesh 30 includes a plurality of thin conductive wires 31 extending between two branch points 32 and defining an opening 33. That is, the conductive mesh 30 is configured as a collection of a large number of thin conductive wires 31 that form branch points 32 at both ends. In particular, in the illustrated example, at the branch point 32, three conductive thin wires 31 are connected at an equal angle, so that a large number of honeycomb-shaped openings 33 having the same shape surrounded by the six conductive thin wires 31 are defined. Yes.

  In addition, each thin conductive wire 31 is integrally formed at each branch point 32. That is, they are formed from the same material without joints. When each thin conductive wire 31 is integrally formed at each branch point 32, it is possible to effectively prevent the conductive thin wire 31 from being broken or broken at each branch point 32.

  Examples of the material for forming the conductive mesh 30 include one or more of gold, silver, copper, platinum, aluminum, chromium, molybdenum, nickel, titanium, palladium, indium, tungsten, and alloys thereof. Can be illustrated.

  The conductive mesh 30 can be formed using an opaque metal material as described above. On the other hand, the conductive mesh 30 is formed with a high aperture ratio of about 70% to 90%. Moreover, the line width of the thin conductive wire 31 is about 2 μm or more and 20 μm or less. For this reason, the electroconductive mesh 30 is grasped | ascertained transparently as a whole, and it does not impair visibility.

  In the example shown in FIG. 3, the conductive thin wire 31 has a surface 31a facing the glass plate 11, a surface 31b facing the holding layer 42, and side surfaces 31c and 31d, and has a rectangular cross section as a whole. doing. The width W of the thin conductive wire 31, that is, the width W along the plate surface of the laminated glass 10 is 2 μm or more and 20 μm or less, and the height (thickness) H, that is, along the normal direction to the plate surface of the laminated glass 10. The height (thickness) H is preferably 1 μm or more and 60 μm or less. According to the conductive thin wire 31 having such a size, since the conductive thin wire 31 is sufficiently thinned, the conductive mesh 40 can be effectively invisible.

  In addition, the conductive thin wire 31 includes the first dark color layer 36 covering the surface facing the holding layer 42 among the surfaces of the conductive metal layer 35 and the conductive metal layer 35, and the surface of the conductive metal layer 35. In addition, a second dark color layer 37 that covers the surface opposite to the glass plate 11 and both side surfaces is included.

  The conductive metal layer 35 made of a metal material having excellent conductivity exhibits a relatively high reflectance. When the light is reflected by the conductive metal layer 35 that forms the conductive thin wires 31 of the conductive mesh 30, the reflected light is visually recognized, which may obstruct the occupant's field of view. Further, when the conductive metal layer 35 is visually recognized from the outside, the designability may be deteriorated. Therefore, the dark color layers 36 and 37 are disposed on at least a part of the surface of the conductive metal layer 35. The dark color layers 36 and 37 may be layers having lower visible light reflectivity than the conductive metal layer 35, and are dark color layers such as black. The dark color layers 36 and 37 make it difficult for the conductive metal layer 35 to be visually recognized, thereby ensuring a good occupant's field of view. Moreover, the fall of the designability when seen from the outside can be prevented.

  In addition, as above-mentioned, the conductive mesh 30 forms the opening 33 with a high aperture ratio from a viewpoint of ensuring transparency or visibility. For this reason, as shown in FIG. 3, the first bonding layer 21 and the holding layer 42 of the mesh sheet 40 are in contact via the opening 33 of the conductive mesh 30. For this reason, the conductive mesh 30 is in a state of being embedded in the first bonding layer 21.

  Next, with reference to FIGS. 5-10, an example of the manufacturing method of the laminated glass 10 is demonstrated. 5-10 is sectional drawing which shows an example of the manufacturing method of the mesh sheet 40 in order.

  First, as shown in FIG. 5, a metal foil 350 is prepared in which at least one surface 350b of a pair of opposed surfaces 350a and 350b is a rough surface. The metal foil 350 forms the conductive metal layer 35 of the conductive thin wire 31. As the metal foil 350, for example, a foil of gold, silver, copper, platinum, aluminum, chromium, molybdenum, nickel, titanium, palladium, indium, tungsten, or an alloy thereof can be used. Further, the thickness of the metal foil 350 can be set to 1 μm or more and 60 μm or less. As the metal foil 350 having at least one surface 350b as a rough surface, one having at least one surface 350b as a rough surface at the time of producing the metal foil 350 may be used. You may use what performed the known roughening process to the one surface 350b. The surface roughness of the rough surface 350b of the metal foil 350 is preferably 0.5 μm or more and 2.5 μm or less in terms of arithmetic average roughness Ra. More preferably, the surface roughness of the rough surface 350b of the metal foil 350 may be greater than 1 μm and less than 2 μm in terms of arithmetic average roughness Ra. According to the metal foil 350 having such a rough surface 350b, the surface roughness of the surface 42a of the holding layer 42 is appropriately set to the arithmetic average roughness in the step of laminating and pressing the metal foil 350 to the holding layer 42 described later. The thickness Ra is 0.5 μm or more and 2.5 μm or less, more preferably more than 1 μm and less than 2 μm.

  Next, as shown in FIG. 6, a dark color film 360 that forms the first dark color layer 36 of the conductive thin wire 31 is formed on the rough surface 350 b of the metal foil 350. For example, the dark color film 360 is subjected to darkening treatment (blackening treatment) on a part of the material forming the metal foil 350, and the dark film 360 made of metal oxide or metal sulfide is formed from the part forming the metal foil 350. Can be formed. Alternatively, a dark color film 360 may be provided on the surface of the rough surface 350b of the metal foil 350, such as a coating film of a dark color material or a plating layer of nickel or chromium.

  Next, as shown in FIG. 7, the holding layer 42 is formed on the base material 41, and the surface 42 a opposite to the surface facing the base material 41 of the holding layer 42 and the dark color film 360 of the metal foil 350 are formed. A metal foil 350 is laminated on the holding layer 42 so as to face the formed rough surface 350b. As the base material 41, for example, polyethylene terephthalate, polyethylene naphthalate, polycarbonate, polystyrene, cyclic polyolefin or the like having a thickness of 0.03 mm to 0.15 mm can be used. The holding layer 42 is formed by, for example, laminating a resin sheet having adhesiveness or tackiness (tackiness) on the base material 41 or applying a resin material on the base material 41 and then applying this resin material. The semi-cured state can be formed so as to have adhesiveness or tackiness (tackiness).

  On the holding layer 42, the metal foil is placed on the holding layer 42 so that the surface (upper surface) 42 a opposite to the surface facing the base material 41 of the holding layer 42 faces the rough surface 350 b on which the dark color film 360 of the metal foil 350 is formed. When the metal foil 350 is pressed against the holding layer 42, that is, when the metal foil 350 is pressed against the holding layer 42, a resin material that forms the upper surface 42a of the holding layer 42 that contacts the rough surface 350b of the metal foil 350. Enters inside the fine irregularities of the rough surface 350b of the metal foil 350. As a result, a rough surface is formed on the upper surface 42 a of the holding layer 42. Then, when the holding layer 42 is cured by heating, irradiation with ionizing radiation, or the like in this state, the metal foil 350 and the holding layer 42 are firmly joined as shown in FIG. 8 by the so-called anchor effect. . The surface roughness of the upper surface 42a of the holding layer 42 is 0.5 μm or more and 2.5 μm or less, more preferably more than 1 μm and less than 2 μm in arithmetic mean roughness Ra.

  Next, as shown in FIG. 9, a resist pattern 39 is provided on the metal foil 350. The resist pattern 39 is a pattern corresponding to the pattern of the conductive mesh 30 to be formed. In the method described here, the resist pattern 39 is provided only on the portion finally forming the conductive mesh 30. The resist pattern 39 can be formed by patterning using a known photolithography technique.

  Next, as shown in FIG. 10, the metal foil 350 including the dark color film 360 is etched using the resist pattern 39 as a mask. By this etching, the metal foil 350 including the dark color film 360 is patterned into a pattern substantially the same as the resist pattern 39. As a result, the conductive metal layer 35 that forms a part of the thin conductive wire 31 is formed from the patterned metal foil 350. Further, a first dark color layer 36 that forms a part of the thin conductive wire 31 is formed from the patterned dark color film 360.

  At this time, of the surface (upper surface) 42a opposite to the surface facing the base material 41 of the holding layer 42, that is, the upper surface 42a in contact with the metal foil 350 of the holding layer 42, the dark color film 360 is formed by the above-described etching. The portion 42a1 from which the metal foil 350 is removed is exposed. The portion 42a1 is a rough surface in contact with the rough surface 350b of the metal foil 350 as described above. Then, by removing the metal foil 350 including the dark color film 360 that has entered the unevenness of the rough surface by etching, the portion 42a1 from which the metal foil 350 has been removed has an arithmetic average roughness of the surface roughness. Ra is exposed as a rough surface of 0.5 μm or more and 2.5 μm or less, more preferably more than 1 μm and less than 2 μm.

  The etching method is not particularly limited, and a known method can be employed. Known methods include, for example, wet etching using an etchant, plasma etching, and the like. Thereafter, as shown in FIG. 11, the resist pattern 39 is removed.

  Next, the second dark color layer 37 is formed on the surface 35a and the side surfaces 35c and 35d opposite to the first dark color layer 36 of the conductive metal layer 35. The second dark color layer 37 is formed by, for example, applying a darkening process (blackening process) to a part of the material forming the conductive metal layer 35, and then forming a metal oxide or metal sulfide from a part of the conductive metal layer 35. A second dark color layer 37 made of a material can be formed. Further, a second dark color layer 37 may be provided on the surface of the conductive metal layer 35 such as a coating film of dark color material or a plating layer of nickel or chromium. Alternatively, the second dark color layer 37 may be provided by roughening the surface of the conductive metal layer 35.

  The mesh sheet 40 thus created is shown in FIG. Finally, the first bonding layer 21 and the first glass plate 11 are laminated from the conductive mesh 30 side of the mesh sheet 40 to bond the mesh sheet 40 and the first glass plate 11. Moreover, the 2nd joining layer 22 and the 2nd glass plate 12 are laminated | stacked from the base material 41 side of the mesh sheet 40, and the mesh sheet 40 and the 2nd glass plate 12 are joined. Thereby, the laminated glass 10 shown in FIG. 3 is produced.

  At this time, as described above, the conductive mesh 30 forms the opening 33 with a high opening ratio from the viewpoint of ensuring transparency or visibility. For this reason, as shown in FIG. 3, the first bonding layer 21 and the holding layer 42 of the mesh sheet 40 are in contact via the opening 33 of the conductive mesh 30. Here, of the surface (upper surface) 42a facing the first glass plate 11 of the holding layer 42, the surface roughness of at least the bonded surface 42a1 facing the first bonding layer 21 is an arithmetic average roughness Ra of 0.00. 5 μm or more and 2.5 μm or less, more preferably more than 1 μm and less than 2 μm. The holding layer 42 having such a surface roughness has fine irregularities on at least the bonded surface 42a1 of the upper surface 42a of the holding layer 42. Then, the first bonding layer 21 enters the fine irregularities, and the first bonding layer 21 is cured in this state, so that the bonded surface 42a1 of the holding layer 42 and the first bonding layer 21 are bonded by the so-called anchor effect. Are firmly joined. As a result, the mesh sheet 40 and the first glass plate 11 are firmly bonded via the first bonding layer 21.

  As mentioned above, the laminated glass 10 in this Embodiment is the mesh sheet 40 arrange | positioned between the 1st glass plate 11 and the 2nd glass plate 12, and the 1st glass plate 11 and the 2nd glass plate 12, A first bonding layer 21 for bonding the first glass plate 11 and the mesh sheet 40; and a second bonding layer 22 for bonding the second glass plate 12 and the mesh sheet 40. The mesh sheet 40 includes a holding layer 42. And the conductive mesh 30 provided on the surface of the holding layer 42 facing the first bonding layer 21, and at least of the surfaces of the holding layer 42 facing the first glass plate 11. The surface roughness of the bonded surface 42a1 facing the first bonding layer 21 is 0.5 μm or more and 2.5 μm or less, more preferably more than 1 μm and less than 2 μm in arithmetic average roughness Ra. According to such a laminated glass 10, the mesh sheet 40 and the first glass plate 11 can be stably and firmly bonded.

  Various modifications can be made to the above-described embodiment. Hereinafter, modified examples will be described with reference to the drawings as appropriate. In the following description and the drawings used in the following description, the same reference numerals as those used for the corresponding parts in the above embodiment are used for the parts that can be configured in the same manner as in the above embodiment. A duplicate description is omitted.

  FIG. 13 shows a modified example of the laminated glass. As in the illustrated example, the laminated glass 100 may not include the base material 41 of the mesh sheet 40. For example, the mesh sheet 40 and the first glass plate are laminated on the mesh sheet 40 shown in FIG. 12 by laminating the first bonding layer 21 and the first glass plate 11 from the conductive mesh 30 side of the mesh sheet 40. 11 can be removed from the mesh sheet 40 after joining. Thereafter, when the second bonding layer 22 and the second glass plate 12 are laminated on the surface of the mesh sheet 40 from which the base material 41 has been removed, and the mesh sheet 40 and the second glass plate 12 are bonded, FIG. The laminated glass 100 shown in FIG.

  In this case, it is preferable that an interfacial release type release layer is provided between the base material 41 and the holding layer 42, or an interlayer release type or a cohesive release type release layer is provided in the holding layer 42. As the interfacial release type release layer, a release layer in which the adhesion between the holding layer 42 and the substrate 41 is relatively lower than the adhesion between the holding layer 42 and the first bonding layer 21 is preferably used. Can do. Examples of such a layer include a silicone resin layer, a fluororesin layer, and a polyolefin resin layer. The delamination type includes a plurality of layers, and the adhesion between the plurality of layers compared to the adhesion between the holding layer 42 and the first bonding layer 21 and the adhesion between the holding layer 42 and the substrate 41. A release layer having a relatively low property can be exemplified. Moreover, as a cohesive peeling type thing, the peeling layer which disperse | distributed the filler as a dispersed phase in the base resin as a continuous phase can be illustrated.

  FIG. 14 shows another modification of the laminated glass. In the illustrated example, the refractive index of the region on the first bonding layer 21 side of the holding layer 42 is between the refractive index of the region on the second bonding layer 22 side of the holding layer 42 and the refractive index of the first bonding layer 21. It has become. According to such a laminated glass 110, the reflectance of light at the interface between the holding layer 42 and the first bonding layer 21 is reduced as compared with the laminated glass having a constant refractive index in the holding layer 42. Can do.

In general, the reflectance R at the interface of light perpendicularly incident on the interface between the medium A having a refractive index n ₁ and the medium B having a refractive index n ₂ is
R = (n ₁ −n ₂ ) ² / (n ₁ + n ₂ ) ²
It is. That is, the reflectance R decreases exponentially as the refractive index difference between the medium A and the medium B decreases. Therefore, by setting the refractive index of the region on the first bonding layer 21 side of the holding layer 42 between the refractive index of the region on the second bonding layer 22 side of the holding layer 42 and the refractive index of the first bonding layer 21. , The total light reflectance between the holding layer 42 and the first bonding layer 21 and between the region on the first bonding layer 21 side and the region on the second bonding layer 22 side of the holding layer 42, When the refractive index in the holding layer 42 is constant, the reflectance of light between the holding layer 42 and the first bonding layer 21 can be made smaller.

  In order to set the refractive index of the region on the first bonding layer 21 side of the holding layer 42 between the refractive index of the region on the second bonding layer 22 side of the holding layer 42 and the refractive index of the first bonding layer 21, for example, The particles 43 having a refractive index different from the refractive index of the material constituting the holding layer 42 can be included in the region of the holding layer 42 on the first bonding layer 21 side. In particular, when the refractive index of the first bonding layer 21 is lower than the refractive index of the holding layer 42, the refractive index of the material constituting the holding layer 42 in the region of the holding layer 42 on the first bonding layer 21 side is larger. It is preferable to include particles 43 having a relatively low refractive index. As such particles 43, hollow or porous particles such as hollow silica particles and porous silica particles having an average particle diameter of 20 nm to 150 nm can be used. Here, the average particle diameter is an arithmetic average particle diameter measured by the method defined in the appendix of JIS Z 8901: 2006 (test powder and test particles).

  As still another modified example of the laminated glass, as shown in FIGS. 3, 13, and 14, an easy adhesion layer 44 may be provided on the surface of the mesh sheet 40 facing the second bonding layer 22. According to such a laminated glass, the adhesion between the mesh sheet 40 and the second bonding layer 22 can be improved. Examples of the easy adhesion layer 44 include polyvinyl butyral (PVB) and ethylene vinyl acetate (EVA).

  It should be noted that various changes can be made to the above-described embodiments and modifications.

  For example, in the example shown in FIG. 4, the conductive mesh 30 has a mesh pattern in which honeycomb-shaped openings 33 having the same shape are regularly arranged. However, the present invention is not limited to such a mesh pattern. A mesh pattern in which openings 33 having the same shape such as triangles and rectangles are regularly arranged, a mesh pattern in which openings 33 having a different shape are regularly arranged, and irregular openings 33 such as a Voronoi mesh are irregular. Various mesh patterns such as a mesh pattern arranged in the above may be used.

  Further, in the example shown in FIGS. 3 and 5 to 14, the second dark color layer 37 is formed on the surface 35 a and the side surfaces 35 c and 35 d opposite to the first dark color layer 36 of the conductive metal layer 35. However, the present invention is not limited to this, and the second dark color layer 37 is formed only on the surface 35a opposite to the first dark color layer 36 of the conductive metal layer 35 or only on the side surfaces 35c and 35d of the conductive metal layer 35. May be.

  When the second dark color layer 37 is formed only on the surface 35a opposite to the first dark color layer 36 of the conductive metal layer 35, for example, on the conductive metal layer 35 after the step shown in FIG. The second dark color layer 37 and the resist pattern 39 are provided in order, and then the second dark color layer 37, the conductive metal layer 35, and the first dark color layer 36 may be etched using the resist pattern 39 as a mask.

  In the case where the second dark color layer 37 is formed only on the side surfaces 35c and 35d of the conductive metal layer 35, for example, the second dark color layer without removing the resist pattern 39 after the step shown in FIG. 37 is formed, and then the resist pattern 39 is removed.

  If the first dark color layer 36 is not necessary, the step of forming the dark color film 360 on the rough surface 350b of the metal foil 350 shown in FIG. 6 may be omitted.

  The cross-sectional shape of the thin conductive wire 31 is not limited to the substantially rectangular shape described above. For example, the width of the thin conductive wire 31 changes so as to become narrower as it is separated from the holding layer 42 along the normal direction of the mesh sheet 40. It may be. As such a cross-sectional shape, the surface 31b on the holding layer 42 side and the surface 31a opposite to the holding layer 42 are parallel, and the side surface 31c is held along the normal direction of the sheet surface of the mesh sheet 40. The side surface 31d has a tapered surface that approaches the side surface 31c as it moves away from the holding layer 42 along the normal direction of the sheet surface of the mesh sheet 40. Thus, the one having a substantially trapezoidal cross section as a whole can be exemplified. When the thin conductive wire 31 has such a cross-sectional shape, the thin conductive wire 31 forming the conductive mesh 30 can be reliably embedded in the first bonding layer 21.

  The laminated glass 10 may be used for a rear window, a side window, or a sunroof of the automobile 1. Moreover, you may use for windows of vehicles other than a motor vehicle, such as a railway, an aircraft, a ship, and a spacecraft.

  Furthermore, the laminated glass 10 can also be used in places other than the vehicle, in particular, in places that divide the room from the outdoors, such as buildings, stores, and house windows.

  In addition, although the some modification with respect to embodiment mentioned above was demonstrated above, naturally, it is also possible to apply combining several modifications suitably.

DESCRIPTION OF SYMBOLS 1 Car 5 Front window 7 Power supply 10 Laminated glass 11 1st glass plate 12 2nd glass plate 15 Connection part 16 Wiring part 21 1st joining layer 22 2nd joining layer 30 Conductive mesh 31 Conductive thin wire 32 Branch point 33 Opening 35 Conductivity Conductive metal layer 36 first dark color layer 37 second dark color layer 39 resist pattern 40 mesh sheet 41 base material 42 holding layer 42a1 bonded surface 43 particles 44 easy adhesion layer 100 laminated glass 110 laminated glass 350 metal film 360 dark film

Claims (4)

A first glass plate and a second glass plate;
A mesh sheet disposed between the first glass plate and the second glass plate;
A first bonding layer for bonding the first glass plate and the mesh sheet, and a second bonding layer for bonding the second glass plate and the mesh sheet,
The mesh sheet has a holding layer, and a conductive mesh provided on the surface of the holding layer facing the first bonding layer,
Of the surface of the holding layer facing the first glass plate, at least the surface roughness of the surface to be bonded facing the first bonding layer is an arithmetic average roughness Ra of 0.5 μm or more and 2.5 μm or less. The
The refractive index of the region on the first bonding layer side of the holding layer is between the refractive index of the region on the second bonding layer side of the holding layer and the refractive index of the first bonding layer. Glass. The easy-adhesion layer on the surface on the side facing said second bonding layer of mesh sheet is provided, laminated glass according to claim 1. Vehicles equipped with a laminated glass according to claim 1 or 2. Claim 1 or 2 window having a laminated glass as described in.

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