JP2016084254A - Manufacturing method of glass laminate - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a manufacturing method of a glass laminate capable of manufacturing a glass laminate having an excellent appearance and a see-through property.SOLUTION: A pattern sheet 20 includes a transparent base material 30 and a conductive pattern member 40 formed on the base material 30. The pattern sheet 20 is formed into such a shape that each of a pair of glass plates 11, 12 can be encapsulated as a whole, inside a peripheral part 20C thereof, in a state spread along each surface of the pair of glass plates 11, 12 and between the pair of glass plates 11, 12 before heating and pressurizing. The pattern sheet 20 is arranged between the pair of glass plates 11, 12, and heated and pressurized.SELECTED DRAWING: Figure 19

Description

  The present invention relates to a method for producing laminated glass.

  DESCRIPTION OF RELATED ART Conventionally, what has arrange | positioned the heating wire to the window glass as a defroster apparatus used for window glasses, such as a front window of a vehicle, and a rear window, is known. In such a defroster device, a heating wire arranged on the window glass is energized, and the window glass is heated by resistance heating to remove fogging of the window glass, or snow and ice attached to the window glass are removed. It can be melted to ensure the sight of the occupant.

  As a technique related to the heating wire, for example, Patent Literature 1 and Patent Literature 2 disclose a transparent film having heating wires (metal thin wires) arranged in a mesh pattern. Among these, Patent Document 1 discloses that a transparent film is provided on a front cover of a vehicular lamp, and Patent Document 2 discloses that a transparent film is used in a vehicle defroster device. ing.

  In Patent Document 1 and Patent Document 2, heating wires arranged in a mesh pattern in a transparent film can be formed from a silver salt photosensitive layer exposed on a transparent substrate made of a flexible resin film. It is also disclosed that it can be formed by printing.

JP 2009-272302 A JP 2010-003667 A

  By the way, in a defroster apparatus, a bonding layer and a heating wire are inserted | pinched between a pair of glass plates, it heats and pressurizes (specifically vacuum lamination), a laminated glass is manufactured, and a defroster apparatus is comprised from this laminated glass. There is a case. Also in such a laminated glass, the transparent film which has a heating wire arrange | positioned by the mesh pattern as disclosed by patent document 1 and patent document 2 is applicable.

  However, when a transparent film as disclosed in Patent Document 1 and Patent Document 2 is applied to the laminated glass, the transparent film is deformed during vacuum lamination at a high temperature, and the appearance of the laminated glass is impaired. The present inventors have found that there is. Specifically, at a high temperature near the glass transition point (Tg), the deformation at the peripheral edge of the transparent film tends to become significantly large, and the peripheral edge of the transparent film protrudes in an arc shape inside the peripheral edge of the glass plate. As a result, the transparent film may enter deeply or the transparent film may be distorted inside the peripheral edge of the glass plate. As a result, undesired lines are generated in the laminated glass, the appearance is impaired, and the transparency may be deteriorated.

  Such poor appearance of the laminated glass due to the deformation of the transparent film is considered to be caused by the following. That is, since the substrate of the transparent film is made of a resin material, when the substrate of the transparent film is heated to the vicinity of its glass transition point (Tg) during high-temperature processing, particularly during vacuum lamination, the substrate deforms. More likely to occur. Therefore, it is presumed that the base material is deformed so that the residual stress accumulated in the base material is released under a heated environment during vacuum lamination.

  The stretched resin base material includes a relatively large residual stress due to stretching during the manufacturing process. Therefore, when a base material made of a stretched film is used, since a relatively large residual stress in the base material is released by heating, the deformation of the base material tends to increase particularly. On the other hand, the non-stretched resin base material contains only a small residual stress as compared with the stretched resin base material. Therefore, when an unstretched resin base material is used, deformation of the base material due to heat is alleviated. However, the non-stretched resin base material also includes residual stress because it is stretched somewhat during manufacture. Therefore, even a non-stretched base material is deformed so as to release residual stress in a heating environment during vacuum lamination. Therefore, when the transparent film as described above is applied to the laminated glass, the appearance of the laminated glass may be impaired regardless of whether the base material is a stretched resin material or an unstretched resin material.

  The present invention has been made in consideration of the above points, and an object of the present invention is to provide a method for producing a laminated glass capable of producing a laminated glass having a good appearance and excellent transparency.

  The present invention includes a pair of glass plates, a transparent base material, and a pattern sheet including a conductive pattern member provided on the base material, and the laminated glass disposed between the pair of glass plates. A method of preparing the pattern sheet, a step of preparing the pair of glass plates, and a step of placing the pattern sheet between the pair of glass plates and heating and pressurizing. The pattern sheet is unfolded along the respective surfaces of the pair of glass plates between the pair of glass plates before heating and pressurizing, and the inner side of the peripheral edge of the pair of glass plates. It is the manufacturing method of the laminated glass currently formed in the shape which can include each whole.

  Further, the conductive pattern member is configured to include a conductive thin wire, and the pattern sheet is disposed between the pair of glass plates before heating and pressurizing, and the glass plate of the conductive thin wires. It may be formed so that the line width of the thin conductive wire located in the vicinity of the peripheral edge of the glass plate is larger than the width of the thin conductive wire located on the center side of the glass plate.

  The base material may be an unstretched resin material.

  The pattern sheet may be heated and pressurized in a vacuum state.

  According to the present invention, it is possible to produce a laminated glass having a good appearance and excellent transparency.

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 view showing a state before lamination of each member constituting the laminated glass of FIG. FIG. 5 is a plan view showing an example of a conductive pattern member. FIG. 6 is a cross-sectional view corresponding to the line AA in FIG. 5, and is a diagram illustrating an example of a cross-sectional shape of the conductive thin wire. FIG. 7 is a cross-sectional view corresponding to the line AA in FIG. 5 and is a diagram illustrating another example of the cross-sectional shape of the conductive thin wire. 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 diagram for explaining an example of a method for producing laminated glass. FIG. 14 is a diagram for explaining an example of a method for producing laminated glass. FIG. 15 is a diagram for explaining an example of a method for manufacturing a laminated glass. FIG. 16 is a diagram for explaining an example of a method for producing laminated glass. FIG. 17 is a cross-sectional view corresponding to the line BB in FIG. 16, showing an example of the cross-sectional shape of the conductive thin wire before being heated and pressurized. FIG. 18 is a cross-sectional view corresponding to the line CC in FIG. 16, and is a diagram illustrating an example of a cross-sectional shape of the conductive thin wire before being heated and pressurized. FIG. 19 is a diagram for explaining an example of a method for manufacturing a laminated glass, and is a diagram for explaining a size relationship between a glass plate and a pattern sheet. FIG. 20 is a diagram for explaining an example of a method for producing a laminated glass, and is a diagram for explaining a state of a pattern sheet after heating and pressurization.

  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, “sheet” is a concept that includes a member that can be called a plate or a film. Therefore, a “pattern sheet” is a member called “pattern plate (substrate)” or “pattern film”. It cannot be distinguished only by differences.

  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.

  Furthermore, 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. Without being bound by meaning, it should be interpreted including the extent to which similar functions can be expected.

  FIGS. 1-20 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. FIG. 4 is a cross-sectional view of the glass, and FIG. 4 is a diagram showing a state before lamination of each member constituting the laminated glass of FIG.

  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 formed of a laminated glass 10 will be described. 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. The laminated glass 10 includes a pair of curved glass plates 11, 12, a pattern sheet 20 disposed between the pair of curved glass plates 11, 12, and a joint for joining the glass plates 11, 12 and the pattern sheet 20. Layers 13 and 14. In addition, the glass plates 11 and 12 of this Embodiment are formed in the trapezoid shape.

  The pattern sheet 20 includes a transparent base material 30, a conductive pattern member 40 provided on the base material 30, a wiring portion 15 for energizing the conductive pattern member 40, a conductive pattern member 40 and a wiring portion. 15 and a connecting portion 16 for connecting the terminal 15 to the terminal 15.

  In the example shown in FIGS. 2 and 3, the conductive pattern member 40 is energized from the power source 7 such as a battery through the wiring portion 15 and the connection portion 16, and the conductive pattern member 40 generates heat by resistance heating. The heat generated in the conductive pattern member 40 is transmitted to the glass plates 11 and 12 through the bonding layers 13 and 14, 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.

  In order to create this laminated glass 10, as shown in FIG. 4, the curved glass plate 11, the bonding layer 13, the pattern sheet 20, the bonding layer 14, and the curved glass plate 12 are superposed in this order, and heated and pressed. By performing (for example, vacuum laminating), the curved glass plate 11, the pattern sheet 20, and the curved glass plate 12 are joined by the joining layers 13 and 14.

  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 occupant'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.

  The glass plates 11 and 12 and the pattern sheet 20 are bonded via bonding layers 13 and 14, respectively. As the bonding layers 13 and 14, layers made of materials having various adhesiveness or tackiness can be used. The bonding layers 13 and 14 preferably have a high visible light transmittance. As a typical joining layer, the layer which consists of polyvinyl butyral (PVB) can be illustrated. The thickness of the bonding layers 13 and 14 is preferably 0.15 mm or more and 0.7 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. Moreover, you may make it one functional layer exhibit two or more functions, for example, the glass plates 11 and 12 of the laminated glass 10, the joining layers 13 and 14, and the base material 30 of the pattern sheet 20 mentioned 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 pattern sheet 20 will be described. The pattern sheet 20 includes a base material 30, a conductive pattern member 40 provided on the base material 30, a wiring part 15 for energizing the conductive pattern member 40, a conductive pattern member 40, and a wiring part 15. And a connecting portion 16 for connecting the two. The pattern sheet 20 of the present embodiment has a larger plane dimension than the glass plates 11 and 12 and is disposed over the entire laminated glass 10. Here, the pattern sheet 20 is unfolded along each surface of the pair of glass plates 11 and 12 between the pair of glass plates 11 and 12 before heating and pressurization, and the peripheral portion 20C ( 19), the shape of the pair of glass plates 11 and 12 can be entirely included. Details of the shape of the pattern sheet 20 will be described later.

  The base material 30 functions as a base material that supports the conductive pattern member 40. The base material 30 is a transparent and electrically insulating substrate that generally transmits a wavelength in the visible light wavelength band (380 nm to 780 nm), and includes a thermoplastic resin.

  The thermoplastic resin contained as the main component in the base material 30 may be any resin as long as it is a thermoplastic resin that transmits visible light. For example, an acrylic resin such as polymethyl methacrylate, a polyolefin resin such as polypropylene, and polyethylene terephthalate. And polyester resins such as triacetyl cellulose (cellulose triacetate), polyvinyl chloride, polystyrene, polycarbonate resin, AS resin and the like. In particular, acrylic resin and polypropylene are preferable because they have excellent optical properties and good moldability. Moreover, although the base material 30 may be formed from either a stretched resin material and an unstretched resin material, in order to suppress the deformation | transformation at the time of a heating, it is preferable to form from the unstretched resin material.

  Moreover, it is preferable that the base material 30 has a thickness of 0.03 mm or more and 0.15 mm or less in consideration of retention of the conductive pattern member 40 being manufactured, light transmittance, and the like.

  The conductive pattern member 40 will be described with reference to FIGS. FIG. 5 is a plan view of the pattern sheet 20 as viewed from the normal direction of the sheet surface, and is a diagram illustrating an example of an arrangement pattern of the conductive pattern members 40.

  The conductive pattern member 40 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 | fever is transmitted to the glass plates 11 and 12 through the joining layers 13 and 14, the glass plates 11 and 12 are warmed.

  The conductive pattern member 40 shown in FIG. 5 is a member composed of conductive fine wires 41 arranged in a mesh pattern that defines a large number of openings 43, and is also a member called a conductive mesh. The conductive pattern member 40 includes a plurality of connection elements 44 extending between the two branch points 42 and defining the opening 43. That is, the thin conductive wire 41 is configured as a collection of a large number of connection elements 44 that form branch points 42 at both ends. In particular, in the illustrated example, at the branch point 42, the three connection elements 44 are connected at an equal angle, so that many honeycomb-shaped (hexagonal) openings 43 surrounded by the six connection elements 44 are formed. It is defined.

  In the illustrated example, the conductive pattern member 40 has a mesh pattern in which honeycomb-shaped openings 43 having the same shape are regularly arranged. However, the conductive pattern member 40 is not limited to such a mesh pattern, and may be a triangle, a rectangle, or the like. Of irregularly shaped openings 43 such as a mesh pattern (lattice pattern) in which openings 43 of the same shape are regularly arranged, a mesh pattern in which irregularly shaped openings 43 are regularly arranged, and a Voronoi mesh. Various mesh patterns such as regularly arranged mesh patterns can be used. The conductive pattern member 40 may have a line and space pattern formed by a plurality of conductive thin wires 41 arranged in one direction.

  Examples of the material for forming the conductive pattern member 40 include gold, silver, copper, platinum, aluminum, chromium, molybdenum, nickel, titanium, palladium, indium, tungsten, and alloys thereof. The above can be illustrated.

  FIG. 6 is a cross-sectional view corresponding to the line AA in FIG. 5, and is a diagram illustrating an example of a cross-sectional shape of the conductive thin wire. On the base material 30, conductive thin wires 41 (connecting elements 44) forming the conductive pattern member 40 are formed. In the illustrated example, the conductive thin wire 41 has a surface 41 a on the base material 30 side, a surface 41 b on the opposite side of the base material 30, and side surfaces 41 c and 41 d, and has a substantially rectangular cross section as a whole. The width W of the conductive thin wire 41, that is, the width W along the sheet surface of the base material 30 is 2 μm or more and 20 μm or less, and the height (thickness) H, that is, in the normal direction to the sheet surface of the base material 30 The along height (thickness) H is preferably 1 μm or more and 12 μm or less. According to the conductive thin wire 41 having such a dimension, since the conductive thin wire 41 is sufficiently thinned, the conductive pattern member 40 can be effectively invisible.

  The conductive thin wire 41 is provided on the first dark color layer 46 provided on the base material 30, the conductive metal layer 45 provided on the first dark color layer 46, and the conductive metal layer 45. The second dark color layer 47 is included. In other words, the surface on the base material 30 side of the surface of the conductive metal layer 45 is covered with the first dark color layer 46, and the surface on the opposite side of the base material 30 among the surface of the conductive metal layer 45 and The second dark color layer 47 covers both side surfaces.

  The conductive metal layer 45 made of a metal material exhibits a relatively high reflectance. When the light is reflected by the conductive metal layer 45 forming the conductive thin wire 41 of the conductive pattern member 40, the reflected light is visually recognized, which may obstruct the occupant's field of view. Further, when the conductive metal layer 45 is visually recognized from the outside, the designability may be deteriorated. Therefore, the dark color layers 46 and 47 are disposed on at least a part of the surface of the conductive metal layer 45. The dark color layers 46 and 47 may be layers having a visible light reflectance lower than that of the conductive metal layer 45, and are dark color layers such as black. The dark color layers 46 and 47 make it difficult for the conductive metal layer 45 to be visually recognized, so that the occupant's field of view can be favorably secured. Moreover, the fall of the designability when seen from the outside can be prevented. Such dark color layers 46 and 47 may be omitted.

  FIG. 7 is a cross-sectional view corresponding to the line AA in FIG. 5 and is a diagram illustrating another example of the cross-sectional shape of the conductive thin wire. In the illustrated example, the conductive thin wire 41 has a surface 41a on the base material 30 side, a surface 41b on the opposite side of the base material 30, and side surfaces 41c and 41d. The surface 41a on the substrate 30 side and the surface 41b on the opposite side of the substrate 30 are parallel. The side surface 41 c has a tapered surface that approaches the side surface 41 d as it is separated from the substrate 30 along the normal direction of the sheet surface of the pattern sheet 20. The side surface 41d also has a tapered surface that approaches the side surface 41c as it is separated from the substrate 30 along the normal direction of the sheet surface of the pattern sheet 20. The thin conductive wire 41 has a substantially trapezoidal cross section as a whole. That is, the width of the thin conductive wire 41 changes so as to become narrower as the distance from the base material 30 increases along the normal line direction of the pattern sheet 20. Similarly to the example shown in FIG. 6, the first dark color layer 46 covers the surface on the base material 30 side of the surface of the conductive metal layer 45. A second dark color layer 47 covers the surface opposite to the material 30 and both side surfaces.

  In FIG. 7, the thin conductive wire 41 has a substantially trapezoidal cross section as a whole, and the width of the thin conductive wire 41 becomes narrower as the distance from the substrate 30 increases along the normal direction of the pattern sheet 20. Although what is changing was shown, it is not restricted to this, The side surfaces 41c and 41d may be comprised by the curve, or may be multistage shape. Further, there may be a portion where the width of the conductive thin wire 41 is partially increased as the distance from the substrate 30 is increased along the normal direction of the pattern sheet 20. That is, when the cross section of the conductive thin wire 41 is viewed as a whole and globally, the width of the conductive thin wire 41 changes so as to become narrower as it is separated from the substrate 30 along the normal direction of the pattern sheet 20. If it is,

  In the example shown in FIG. 7, the width of the conductive thin wire 41 is configured to change so as to become narrower as it is separated from the base material 30 along the normal direction of the pattern sheet 20. 12, when the bonding layers 13 and 14 and the pattern sheet 20 are laminated, the conductive pattern member 40 can be reliably embedded in the bonding layer 13, and bubbles remain at the interface between the conductive pattern member 40 and the bonding layer 13. Can be suppressed.

  Next, with reference to FIGS. 8-20, an example of the manufacturing method of the laminated glass 10 is demonstrated. 8-15 is sectional drawing which shows an example of the manufacturing method of the laminated glass 10 in order, and is a figure which demonstrates the manufacture of the pattern sheet 20 in detail especially. 16-20 is a figure explaining in detail the manufacturing process of the laminated glass 10 manufactured by pinching the pattern sheet 20 between the glass plates 11 and 12 after the pattern sheet 20 is manufactured.

  When manufacturing the pattern sheet 20, first, as shown in FIG. 8, the base material 30 is prepared. The base material 30 is a transparent electrically insulating substrate that generally transmits a wavelength in the visible light wavelength band (380 nm to 780 nm), and includes a thermoplastic resin.

  Next, as shown in FIG. 9, a first dark color layer 46 is provided on the substrate 30. For example, the first dark color layer 46 is formed on the substrate 30 by a plating method including electroplating and electroless plating, a sputtering method, a CVD method, a PVD method, an ion plating method, or a combination of these two or more. Can be provided. Various known materials can be used as the material for the first dark color layer 46. For example, copper nitride, copper oxide, nickel nitride and the like can be exemplified.

  Next, as shown in FIG. 10, a conductive metal layer 45 is provided on the first dark color layer 46. As described above, the conductive metal layer 45 is a layer made of one or more of gold, silver, copper, platinum, aluminum, chromium, molybdenum, nickel, titanium, palladium, indium, tungsten, and alloys thereof. The conductive metal layer 45 can be formed by a known method. For example, a method of attaching a metal foil such as a copper foil using a weather-resistant adhesive (such as a two-component mixed urethane ester adhesive), a plating method including electroplating and electroless plating, a sputtering method, a CVD method , PVD method, ion plating method, or a combination of two or more of these methods can be employed.

  Next, as shown in FIG. 11, a resist layer 48 is provided on the conductive metal layer 45. The resist layer 48 is a resin layer having photosensitivity to, for example, light in a specific wavelength range, for example, ultraviolet rays. This resin layer may be formed by sticking a resin film, or may be formed by coating a fluid resin. The specific photosensitive characteristics of the resist layer 48 are not particularly limited. For example, as the resist layer 48, a photocurable photosensitive material may be used, or a photodissolvable photosensitive material may be used.

  Thereafter, as shown in FIG. 12, the resist layer 48 is patterned to form (stack) a resist pattern 49. As a method of patterning the resist layer 48, various known methods can be employed. In this example, a resin layer having photosensitivity to light in a specific wavelength region, for example, ultraviolet rays, is used as the resist layer 48. Patterning is performed using a known photolithography technique. First, a mask in which a portion to be patterned is opened or a mask in which a portion to be patterned is shielded is disposed on the resist layer 48, and the resist layer 48 is irradiated with ultraviolet rays through this mask. Thereafter, the portion where the ultraviolet rays are shielded by the mask or the portion irradiated with the ultraviolet rays is removed by means such as development. Thereby, the patterned resist pattern 49 can be formed.

  Next, as shown in FIG. 13, the conductive metal layer 45 and the first dark color layer 46 are etched using the resist pattern 49 as a mask. By this etching, the conductive metal layer 45 and the first dark color layer 46 are patterned into a pattern substantially the same as the resist pattern 49. 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. 14, the resist pattern 49 is removed.

  Finally, the second dark color layer 47 is formed on the surface 41b and the side surfaces 41c and 41d on the opposite side of the base material 30 of the conductive metal layer 45. For example, the second dark color layer 47 is subjected to a darkening process (blackening process) on a part of the material forming the conductive metal layer 45, and the metal oxide or metal sulfide is formed from a part of the conductive metal layer 45. A second dark color layer 47 made of a material can be formed. Alternatively, the second dark color layer 47 may be provided on the surface of the conductive metal layer 45, such as a coating film of dark color material or a plating layer of nickel or chromium. Alternatively, the second dark color layer 47 may be provided by roughening the surface of the conductive metal layer 45.

  In this example, the second dark color layer 47 is formed on the surface 41b and the side surfaces 41c and 41d opposite to the base material 30 of the conductive metal layer 45. However, the present invention is not limited to this, and the base material 30 of the conductive metal layer 45 is not limited thereto. The second dark color layer 47 may be formed only on the opposite surface 41 b or only on the side surfaces 41 c and 41 d of the conductive metal layer 45.

  In the case where the second dark color layer 47 is formed only on the surface 41b on the opposite side of the base material 30 of the conductive metal layer 45, for example, the second metal layer 45 is formed on the conductive metal layer 45 after the step shown in FIG. A dark color layer 47 and a resist layer 48 are provided in this order, and the resist layer 48 is patterned to form a resist pattern 49. Thereafter, the second dark color layer 47, the conductive metal layer 45, and the first dark color layer 46 may be etched using the resist pattern 49 as a mask.

  When the second dark color layer 47 is formed only on the side surfaces 41c and 41d of the conductive metal layer 45, for example, the second dark color layer without removing the resist pattern 49 after the step shown in FIG. 47 is formed, and then the resist pattern 49 is removed.

  If the first dark color layer 46 is not necessary, the step of providing the first dark color layer 46 on the substrate 30 shown in FIG. 9 may be omitted.

  And after the pattern sheet 20 as described above is manufactured, the curved glass plate 11, the bonding layer 13, the pattern sheet 20, the bonding layer 14, and the curved glass plate 12 are superposed in this order, and heated and pressed. The laminated glass 10 is manufactured. Such a laminated glass 10 includes a pair of curved glass plates 11 and 12, a pattern sheet 20 disposed between the pair of curved glass plates 11 and 12, the glass plates 11 and 12, and the pattern sheet 20. And bonding layers 13 and 14 for bonding the glass plates 11 and 12 and the pattern sheet 20 to each other. The pattern sheet 20 includes a base material 30 and a conductive pattern member 40 formed on the base material 30. The conductive pattern member 40 is given a desired pattern with high accuracy by the patterning method described above. Therefore, for example, the laminated glass 10 having excellent optical characteristics can be produced.

  Next, the manufacturing process of the laminated glass 10 is explained in full detail using FIGS.

  When the laminated glass 10 is disposed between the glass plates 11 and 12, the pattern sheet 20 is first cut out. FIG. 16 shows a state where the pattern sheet 20 is cut out. In the illustrated example, the pattern sheet 20 is cut out in a trapezoidal shape corresponding to the shape of the glass plates 11 and 12. The cut pattern sheet 20 is disposed between the glass plates 11 and 12, as indicated by the arrows in the figure.

  FIG. 19 shows a state in which the pattern sheet 20 is disposed between the glass plates 11 and 12. Here, as shown in FIG. 19, the pattern sheet 20 of the present embodiment is arranged along each surface of the pair of glass plates 11, 12 between the pair of glass plates 11, 12 before heating and pressurization. In the expanded state, the whole of each of the pair of glass plates 11 and 12 is formed on the inner side of the peripheral edge portion 20C.

  In addition, in this Embodiment, since the glass plates 11 and 12 are curving, the state expand | deployed along each surface of the glass plates 11 and 12 WHEREIN: The pattern sheet 20 is curved and deformed and the glass plate 11 Or the state along which it contact | abutted to the curved surface of the glass plate 12 entirely is meant.

  In the present embodiment, by defining the shape of the pattern sheet 20 as described above, in the process of heating and pressurizing the pattern sheet 20 between the glass plates 11 and 12 as will be described later. In addition, the pattern sheet 20 is prevented from being thermally deformed and entering the inside of the peripheral portions 11C and 12C of the glass plates 11 and 12. Thereby, the laminated glass 10 with a favorable external appearance and excellent transparency can be provided.

  The shape of the pattern sheet 20 is such that the peripheral edge portion 20C of the pattern sheet 20 is thermally deformed inside the peripheral edge portions 11C and 12C after heating and pressurization in the state of being arranged between the glass plates 11 and 12. It is preferable to define the degree. Here, since the thermal deformation changes depending on the material of the base material 30 and the outer shape of the pattern sheet 20, the shape of the pattern sheet 20 is appropriately determined in consideration of the material of the base material 30 and the outer shape of the pattern sheet 20. It is preferable to do. Moreover, it is not preferable in terms of manufacturing cost to make the pattern sheet 20 excessively larger than the glass plates 11 and 12. Therefore, the shape of the pattern sheet 20 is such that the peripheral portion 20C of the pattern sheet 20 is not thermally deformed into the peripheral portions 11C and 12C after heating and pressurization, and the manufacturing cost is suppressed as much as possible. It is preferable to set it to such an extent that it can be performed.

  In FIG. 19, each of the pattern sheet 20 and the glass plates 11 and 12 is formed in a trapezoidal shape, and the upper bottom side surplus length is a length that the pattern sheet 20 protrudes from the upper bottom of the glass plates 11 and 12. A pair of glass plates 11 and 12 that connect T1, a lower bottom side surplus length T2 that is a length protruding from the lower bottom of the glass plates 11 and 12, and an end portion of the upper base and an end portion of the lower base. A side-side surplus length T3 that is a length protruding from the side is shown. In the illustrated example, the upper and lower bases of the glass plates 11 and 12 are parallel. In the present embodiment, as an example, when the length (height) along the plate surface between the upper and lower bases of the glass plates 11 and 12 is L1, (L1 / 2) × 0.025 ≦ T1 ≦ (L1 / 2) × 0.1 and (L1 / 2) × 0.025 ≦ T2 ≦ (L1 / 2) × 0.1. Further, when the length along the plate surface between the opposing sides of the glass plates 11 and 12 on the intermediate position between the upper and lower bases of the glass plates 11 and 12 is L2, (L2 / 2) × 0.025 ≦ T3 ≦ (L2 / 2) × 0.1. The inventor of the present invention defines the surplus lengths T1, T2, and T3 as described above, so that regardless of the type of material of the base material 30 and stretching / non-stretching, after heating and pressurization with high probability, It has been found that the peripheral portion 20C of the pattern sheet 20 does not enter the peripheral portions 11C and 12C due to thermal deformation.

  In addition, although the case where each of the pattern sheet 20 and the glass plates 11 and 12 was formed in a trapezoidal shape was described here, the above-described dimension range relating to the surplus length in the case of the trapezoidal shape is as follows. It was also confirmed that each of the glass plates 11 and 12 was effective even when formed in a rectangular shape.

  Further, in FIG. 16, an area AR <b> 2 on one side (upper side in the drawing) and an other side (lower side on the drawing) in the direction in which the connection line 16 extends in the area where the conductive pattern member 40 is arranged in the pattern sheet 20. An area AR3 and a central area AR1 between the area AR2 and the area AR3 are shown. The area AR2 is located in the vicinity of the upper portion of the peripheral edge 20C of the pattern sheet 20, and the area AR3 is located in the vicinity of the lower portion of the peripheral edge 20C of the pattern sheet 20.

  FIG. 16 shows an area AR5 on one side (left side in the drawing) in the direction extending from one connection line 16 to the other connection line 16 in the area where the conductive pattern member 40 is arranged in the pattern sheet 20. In addition, an area AR6 on the other side (right side of the drawing) and an area AR4 on the center side between these areas AR5 and AR6 are shown. The area AR5 is located in the vicinity of the left portion of the pattern sheet 20 at the peripheral edge 20C, and the area AR6 is located in the vicinity of the right portion of the peripheral edge 20C of the pattern sheet 20.

  17 is a cross-sectional view corresponding to the line B-B in FIG. 16, and FIG. 18 is a cross-sectional view corresponding to the line C-C in FIG. The cross-sectional shape of the conductive thin wire 41 before being processed is shown. FIG. 17 shows a cross-sectional shape and a width of the conductive thin wire 41 located in each of the above-described region AR1, region AR2, and region AR3. FIG. 18 also shows the cross-sectional shape and width of the conductive thin wire 41 located in each of the above-described region AR4, region AR5, and region AR6. In addition, when the cross section of the conductive fine wire 41 is strictly observed along the CC line in FIG. 16, the cross section of the conductive thin wire 41 does not appear in a cross section perpendicular to the direction in which the conductive thin wire 41 extends. In FIG. 18, for convenience of explanation, the cross section of the thin conductive wire 41 is represented by a cross section in a direction orthogonal to the direction in which the thin conductive wire 41 extends.

  Here, as shown in FIG. 17, the width W2 of the thin conductive wire 41 located in the region AR2 and the region AR3 is formed larger than the width W1 of the thin conductive wire 41 located in the region AR1. Further, as shown in FIG. 18, the width W3 of the thin conductive wire 41 located in the region AR5 and the region AR6 is also formed larger than the width W1 of the thin conductive wire 41 located in the region AR4.

  That is, in this Embodiment, when the pattern sheet 20 is arrange | positioned between the glass plates 11 and 12 before a heating and pressurization, the peripheral parts 11C and 12C of the glass plates 11 and 12 of the electrically conductive thin wires 41 are shown. Are formed such that the line widths W2 and W3 of the conductive thin wires 41 located in the vicinity of are larger than the line width W1 of the conductive thin wires 41 located on the center side of the glass plates 11 and 12.

  In the process of heating and pressurizing the pattern sheets 20 between the glass plates 11 and 12, the peripheral edge portion 20C of the pattern sheet 20 tends to be greatly deformed, and the peripheral edge portion 20C is greatly deformed. In some cases, the conductive thin wire 41 in the vicinity of the peripheral portion 20C may be contracted and become thin. Therefore, in the present embodiment, the line widths W2 and W3 of the conductive thin wires 41 located in the vicinity of the peripheral portions 11C and 12C of the glass plates 11 and 12 of the conductive thin wires 41 are arranged on the center side of the glass plates 11 and 12. It is made larger than the line width W1 of the conductive thin wire 41 located. Thereby, even when the peripheral edge portion 20C of the pattern sheet 20 is greatly deformed during the heating and pressurizing steps, it is possible to prevent the conductive thin wires 41 on the peripheral edge portion 20C side from being contracted and thinned. it can.

  Then, returning to FIG. 19, after the pattern sheet 20 having the shape as described above is disposed between the glass plates 11 and 12, heating and pressurizing steps are performed. The heating and pressurizing steps are performed, for example, by vacuum lamination using a known vacuum laminating apparatus. That is, heating and pressurization are performed in a vacuum state.

  FIG. 20 shows the glass plates 11 and 12 and the pattern sheet 20 after the heating and pressurizing steps. As shown in the figure, the pattern sheet 20 is contracted from the state before heating and pressurization indicated by the two-dot chain line toward the peripheral portions 11C and 12C of the glass plates 11 and 12 due to thermal deformation. However, in this embodiment, since the pattern sheet 20 is formed larger than the glass plates 11 and 12 as described above, the peripheral edge portion 20C of the pattern sheet 20 is changed to the peripheral edge portions 11C and It does not reach the inner side than 12C. Therefore, the peripheral edge portion 20C of the pattern sheet 20 is prevented from entering the inside of the peripheral edge portions 11C, 12C of the glass plates 11, 12. In this way, in the present embodiment, the peripheral edge portion 20C of the pattern sheet 20 greatly enters into the inside of the peripheral edge portions 11C and 12C of the glass plates 11 and 12 so as to project in an arc shape, or the peripheral edge portion 11C. , 12C is prevented from entering in a distorted state. Thereby, the laminated glass 10 with a favorable external appearance and excellent transparency can be provided.

  In FIG. 20, the peripheral edge portion 20 </ b> C of the pattern sheet 20 after the heating and pressurizing steps is positioned slightly outside the peripheral edge portions 11 </ b> C and 12 </ b> C of the glass plates 11 and 12. In such a case, the peripheral portion 20C is trimmed. The laminated glass 10 is manufactured by the above.

  As described above, in the present embodiment, the pattern sheet 20 is developed between the pair of glass plates 11 and 12 along each surface of the pair of glass plates 11 and 12 before heating and pressurization. In the state, it is formed in the shape which can include the whole of each of a pair of glass plates 11 and 12 inside the peripheral part 20C. The laminated glass 10 is manufactured by arrange | positioning such a pattern sheet 20 between a pair of glass plates 11 and 12, and heating and pressurizing. Thereby, by providing the peripheral edge portion 20C of the pattern sheet 20 to the inside of the peripheral edge portions 11C and 12C of the glass plates 11 and 12, it is possible to provide the laminated glass 10 having a good appearance and excellent transparency. Can do.

  Moreover, when the pattern sheet 20 of this Embodiment is arrange | positioned between a pair of glass plates 11 and 12 before a heating and pressurization, the peripheral part 11C of the glass plates 11 and 12 of the conductive thin wires 41 is shown. , 12C is formed so that the line width of the conductive thin wire 41 located in the vicinity of 12C is larger than the line width of the conductive thin wire 41 positioned on the center side of the glass plates 11, 12. Thereby, even when the peripheral edge portion 20C of the pattern sheet 20 is greatly deformed during the heating and pressurizing steps, it is possible to prevent the conductive thin wires 41 on the peripheral edge portion 20C side from being contracted and thinned. it can. Thereby, it is possible to prevent the appearance of the conductive thin wire 41 from being damaged and to prevent the transparency from deteriorating, and to prevent the conductive thin wire 41 from becoming abnormal due to the thin conductive wire 41. it can.

  Note that various modifications can be made to the above-described embodiment.

  For example, the conductive pattern member 40 of the pattern sheet 20 may be provided not on the glass plate 11 side surface of the substrate 30 but on the glass plate 12 side surface. Moreover, you may provide in the both surfaces of the glass plate 11 side and the glass plate 12 side of the base material 30. FIG.

  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 Glass plate 11C Peripheral part 12 Glass plate 12C Peripheral part 13 Joining layer 14 Joining layer 15 Wiring part 16 Connection part 20 Pattern sheet 20C Peripheral part 30 Base material 40 Conductive pattern member 41 Conductivity Fine wire 41a Surface 41b Surface 41c, 41d Side surface 42 Branch point 43 Opening

Claims (4)

A method for producing a laminated glass comprising: a pair of glass plates; and a pattern sheet including a transparent substrate and a conductive pattern member provided on the substrate, wherein the pattern sheet is disposed between the pair of glass plates. There,
Preparing the pattern sheet;
Preparing the pair of glass plates;
Placing the pattern sheet between the pair of glass plates and heating and pressurizing;
With
Each of the pair of glass plates is disposed on the inner side of the peripheral edge of the pattern sheet in a state of being developed along each surface of the pair of glass plates between the pair of glass plates before heating and pressing. The manufacturing method of the laminated glass currently formed in the shape which can include the whole. The conductive pattern member includes a conductive fine wire,
The pattern sheet is arranged between the pair of glass plates before heating and pressurization, and the wire width of the conductive thin wires located in the vicinity of the peripheral edge of the glass plate among the conductive thin wires is the glass plate. The manufacturing method of the laminated glass of Claim 1 currently formed so that it may become larger than the line | wire width of the electroconductive fine wire located in the center side.   The said base material is a manufacturing method of the laminated glass of Claim 1 or 2 which is an unstretched resin material.   The method for producing a laminated glass according to any one of claims 1 to 3, wherein the pattern sheet is heated and pressurized in a vacuum state.

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