JP2855199B2 - Automotive window glass - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a window glass for automobiles,
The present invention relates to an automotive window glass that is optimal for an automobile sunroof, an opera window, and the like, in which transmission of visible light and transmission of heat rays are suppressed. 2. Description of the Related Art Automobiles equipped with a sunroof have become widespread as a means for responding to demands for automobiles having a structure that provides a sense of openness for driving cars and passengers. On the other hand, as a design requirement for automobiles, recently, a glassy design, that is, a design in which the glass area of the automobile is increased, is required. Is required to increase. However, as the glass area increases, the amount of sunlight, particularly heat rays, entering the room increases, and the tendency for the room to become hot increases. Therefore,
In order to block direct sunlight, a sunshade is provided under the sunroof glass, but in this case, storage space on the roof of the car is a problem, and sufficient head clearance can not be obtained. There were problems and design constraints. In addition, as a substitute for mounting the sunshade, we use heat ray reflective glass for the window glass for the sunroof and control the incidence of heat rays of sunlight,
Attempts have been made to ensure head clearance and reduce the cooling load. Further, as an improved sunroof glass, Japanese Patent Laid-Open Publication No. Sho 59-182250 discloses that a semi-reflective film 12 is coated on the inner surface of a single-pane plate glass 11, and the exposed surface of the semi-reflective film 12 is further improved. There is proposed a sunroof window glass having a structure as shown in FIG. 7 in which a point group 13 formed by using enamel is adhered to the window glass. However, this type of sunroof glazing 11
Since it is a single plate, the semi-reflective film 12 is easily damaged and is insufficient in durability, and when it is intended to reduce both the visible light transmittance and the heat ray transmittance to a certain value, the heat ray Although the reflectivity is improved, the reflectivity is increased and an effect like a mirror surface is likely to occur, and various inconveniences have occurred from the occupant side. In other words, the adverse effects of the sunroof glass as viewed from the occupant side in the vehicle include heat ray reflective glass acting like a mirror and reflecting what is disposed in the vehicle, or reflecting the road condition during traveling. The reflected image has a flickering or glaring feeling, and a double image occurs, which makes it difficult to see the outside of the vehicle, resulting in an inconvenience that a sufficient open feeling cannot be obtained. [Problems to be Solved by the Invention] The present invention is intended to improve durability and reduce a cooling load, but also to satisfy a design requirement that does not impair a feeling of freedom and is oriented to glassiness. It is another object of the present invention to provide a window glass for an automobile that can secure the privacy of the interior of the vehicle. Means for Solving the Problems The present invention has been made to achieve the above object, and a transparent outer glass sheet having a heat ray reflective film formed on the inside of a vehicle, and the heat ray reflective film being covered. A transparent film and / or a transparent inner glass laminated on the inner side of the outer glass so that the transparent film and / or the transparent inner glass have a visible light transmittance. The present invention provides an automotive window glass characterized in that it is colored so as to have a transmittance lower than the visible light transmittance of the outer plate glass and is provided with a light shielding function. Hereinafter, the present invention will be described in more detail with reference to the drawings. The vehicle window glass 8 according to the present invention includes a transparent outer glass 1, a transparent heat ray reflective film 2 formed on the inside of the outer glass 1, that is, on the indoor side of the automobile, and the heat ray reflective film 2. The transparent film (only the laminated intermediate film 4 and the polyethylene terephthalate film 7) laminated on the inner side of the outer glass sheet 1 so that the exposed surface side (the inner side of the automobile) is covered
In addition to the single-panel configuration, there is also included a two-panel configuration combining a laminated intermediate film 4 and a polyethylene terephthalate film 7) and / or a transparent inner glass plate 5. In addition, the transparent film and / or the transparent inner glass sheet 5 are provided with a light-shielding function capable of suppressing transmission of visible rays and heat rays (infrared rays) such as solar radiation heat by being colored, and are resistant to light. It is formed as a member having a high penetration property. FIG. 1 shows a typical embodiment of the present invention, in which a window glass 8 for an automobile has a higher transparency than a transparent outer glass 1 having a heat ray reflective film 2 formed on the inside of the vehicle. The inner plate glass 5 and the transparent laminated intermediate film 4 are laminated in this order from the inside of the vehicle. And
At least one of the inner glass sheet 5 and the laminated interlayer film 4, preferably both the inner glass sheet 5 and the laminated interlayer film 4, are colored so that their visible light transmittance is lower than that of the outer glass sheet 1. Thus, a light shielding function is provided. As the colored transparent inner glass 5 used in this case, trace amounts of metal oxides such as iron, nickel, cobalt, and selenium in the composition of soda-lime glass;
Alternatively, a heat ray absorbing glass formed by adding a metal is preferable. In addition, the color presented in that case also has a relationship with the added metal oxide or metal, and an appropriate color such as bronze, blue, gray, or green can be selected. The colored transparent matching interlayer 4 can also be used by selecting an appropriate color such as bronze, blue, gray, and green. FIGS. 2 to 4 show other embodiments of the present invention, respectively. Among them, a window glass 8 for an automobile shown in FIG. 2 has the same basic configuration as that of FIG. The case where the light-shielding pattern 6 is formed on the exposed surface on the vehicle interior side of the sheet glass 5 is shown. In this case, coloring of one or both of the transparent matching interlayer film 4 and the transparent inner glass plate 5 is performed in the same manner as in the embodiment of FIG. Also, a light-shielding pattern 6 that is arranged to be scattered on the inside of the inner glass 5
Is formed by using a color ceramic ink colored in an appropriate color having a light-shielding effect, such as black, and applying it in an appropriate pattern. At this time, the pattern of the light-shielding pattern 6 is appropriately selected according to the desired shape as long as the light-shielding portion and the non-light-shielding portion are formed in a desired arrangement relationship, such as a mesh shape or a dot shape. be able to. On the other hand, an automotive window glass 8 shown in FIG. 3 has a transparency made of a polyethylene terephthalate film (polyester film) 7 from the inside of the vehicle, compared to a transparent outer glass 1 having a heat ray reflective film 2 formed on the inside of the car. , A transparent inner glass plate 5, and a transparent laminated interlayer film 4 are laminated in this order from the inside of the vehicle. In addition, at least one of the polyethylene terephthalate film 7, the inner glass 5 and the intermediate film 4 is the same as in FIG. 1 so that its visible light transmittance is lower than that of the outer glass 1. It is colored and provided with a light blocking function. Further, the window glass 8 for an automobile shown in FIG. 4 has a transparent outer glass 1 having a heat ray reflective film 2 formed on the inside of the vehicle.
A transparent film such as a polyethylene terephthalate film (polyester film) 7 is laminated on the inside of the outer glass 1 so as to cover the heat ray reflective film 2. The transparent film such as the polyethylene terephthalate film 7 is colored so that its visible light transmittance is lower than that of the outer glass 1 and has a light shielding function. In the present invention, the heat ray reflective film 2 formed on the inner surface of the outer glass sheet 1 includes a tin oxide film, a tin oxide film doped with Sb or F, an isodium oxide film, and an indium oxide film doped with Sn. , Titanium oxide coating,
Metal oxide coatings such as chromium oxide and cobalt oxide, nitride coatings, boride coatings, carbide coatings, inorganic coatings such as composite compound coatings, and metal coatings such as Ag, Au, Pt, Cu, Al, and Cr, or these Metal coating containing Ni as the main component, Ni-Cr, Ni
-A synthetic film of Cr-Fe, Ni-Cu or the like is used. When the above-mentioned metal coating, alloy coating, inorganic coating or the like is used as the heat ray reflection film 2, tin oxide, tin oxide, or the like is added to the surface of the metal coating or the like in order to increase its durability and visible light transmittance.
To form a non-absorbable derivative coating such as titanium oxide, indium oxide, zinc oxide, tungsten oxide, aluminum oxide, bismuth oxide, zirconium oxide, or
It is preferable to form a three-layer system by sandwiching a metal film, an alloy film, or the like from above and below with the above-mentioned non-absorbable derivative film in a sandwich manner. In particular, the heat ray reflective film 2 capable of obtaining heat ray reflectivity, durability, and high visible light transmittance includes, for example, a three-layer system of titanium oxide / Ag / titanium oxide, and a three-layer system of zinc oxide / Ag / zinc oxide. And a three-layer system of tungsten oxide / Ag / tungsten oxide. However, the heat ray reflective film 2 having the above-described configuration is only a typical example, and may be further multi-layered, multi-layered by different kinds of films, formed into a composite film, or formed from other materials. Is also good. When the heat ray reflective film 2 is exposed on the end face of the glass, the water resistance, heat resistance, chemical resistance, corrosion gas resistance, etc. of the film itself are not sufficient. The film may peel off. Therefore, the heat ray reflective film 2 is at least 3 mm inward from the end surface of the outer glass 1.
It is particularly preferable to form the outer glass 1 on the inner surface of the vehicle with a blank zone having a width of 6 to 20 mm interposed therebetween. In the present invention, the laminated intermediate film 4 may be formed using an appropriate film, such as an EVA-based resin film or a polyurethane film, in addition to the polyvinyl butyral film. Furthermore, by matching the color tone of the laminated interlayer film 4 of the outer glass 1 and the inner glass 5 in the automotive window glass 8 of the present invention with the color tone of the window glass of other parts, for example, the windshield, side glass, rear glass, etc. Alternatively, by matching the color tone of the vehicle body, a sense of unity as a whole may be obtained. FIG. 6 is a perspective view of an automobile when the automobile window glass of the present invention is applied to a sunroof. [Operation of the Invention] The vehicle window glass 8 of the present invention is composed of the outer glass 1 and a transparent film (in addition to the single-layer structure of the laminated interlayer 4 and the polyethylene terephthalate film 7 alone, the laminated interlayer 4 and the polyethylene terephthalate). The heat ray reflective film 2 is interposed between the heat ray reflective film 2 and the transparent inner plate glass 5 (including a two-sheet configuration in which the film 7 is combined with the film 7). Since it can be reflected, it is possible to reduce the cooling load by suppressing the flow of solar heat rays into the inside of the vehicle, and the heat ray reflective film 2 can be given a function as a so-called half mirror. When looking from the inside of the car to the bright outside, a sense of openness that can be seen through is obtained, and when looking at the inside of the dark car from the outside, it looks like a mirror and looks like a mirror, maintaining the privacy inside the car. Fruit is obtained. In particular, according to the present invention, a transparent film (only the laminated intermediate film 4 and only the polyethylene terephthalate film 7) laminated on the inside of the outer glass 1 so as to cover the heat ray reflective film 2 inside the outer glass 1 is covered. And a two-layer configuration in which a laminated intermediate film 4 and a polyethylene terephthalate film 7 are combined) and / or a transparent inner glass 5
These transparent films and / or transparent inner glass sheets have a visible light transmittance of the outer glass sheet 1.
Is colored so as to be lower than the visible light transmittance and has a light shielding function, so that the room light is absorbed once by the transparent film and / or the transparent inner glass before reaching the heat ray reflective film 2. Further, the light reflected by the heat ray reflective film 2 is also absorbed again by the transparent film and / or the transparent inner glass plate, so that the reflection of indoor light can be reduced, and the reflection from the indoor side can be reduced. Can be reduced. On the other hand, light that enters the interior of the vehicle from the outside is colored so that the visible light transmittance is reduced on the inside of the vehicle, even if a transparent film having a light blocking function and / or a transparent inner glass plate is provided. Since the light is absorbed only once by the transparent film and / or the transparent inner glass, the reduction of the light entering the vehicle can be reduced, and the feeling of openness is not impaired. In addition, since the transparent film and / or the transparent inner glass plate in the present invention is formed using a colored transparent member such as a heat ray reflection absorbing glass, the solar radiation heat in the visible light region and the infrared region is reduced. It can be appropriately absorbed, and the cooling load can be reduced. For example, in the sunroof window glass 8 having the configuration shown in FIG. 5, heat rays and visible rays incident from the outside toward the indoor side are reflected by the heat ray reflection film 2 formed on the outer glass 1.
, And the transmission to the indoor side can be a part thereof. In addition, visible light incident from the indoor side toward the outer glass sheet 1 is absorbed when passing through the colored transparent inner glass sheet 5 and the laminated intermediate film 4 made of colored transparent film, and becomes a heat ray. Light reaching the reflection film 2 is reduced, and furthermore, when the light is reflected from the heat ray reflection film 2 toward the indoor side, the light passes through the colored intermediate film 4 and the inner glass 5 again, so that the light is further reduced. Therefore, reflection of light toward the indoor side can be effectively reduced. [Example] Hereinafter, an example of the present invention will be described. Example 1 A titanium nitride film (thickness: 8)
Outer panel glass 1 (thickness 2.0mm made of transparent float glasses depositing Å) by _{sputtering, T V: 10%, R} V: 28
_{%, T E: 6%,} R E: inner plate glass 5 (thickness 2.0mm of 40%) and colored in bronze the heat absorbing glass, T _V: 84
%, _RV : 9%, _TE : 79%, _RE : 8%) and a polyvinyl butyral colored in bronze.
(A thickness of 0.76 mm) to produce a sunroof window glass as shown in FIG. The results of measuring the optical characteristics and the results of the performance test of Example 1 are shown as Sample 1 in Table 1. Comparative Example 1 An inner glass (sheet thickness: 2.0 mm) made of a bronze-colored heat ray absorbing float glass in which a titanium nitride film is applied as a heat ray reflecting film by a sputtering method on a vehicle outer side surface, and an outer glass (sheet) made of a transparent float glass (Thickness: 2.0 mm) and a laminated interlayer (thickness: 0.76 mm) made of polyvinyl butyral colored in bronze to manufacture a sunroof window glass having a configuration substantially similar to the embodiment shown in FIG. did. The results of measuring the optical characteristics and the results of the performance test for Comparative Example 1 are shown as Sample 2 in Table 1. According to the above example, in the case of the windowpane for a sunroof according to the present invention, the heat ray transmittance is low, the effect of suppressing an increase in indoor temperature is high, and the visible light transmittance is suppressed to a desired preferable degree. As a result, it was possible to confirm the effect that the privacy in the car could be maintained while obtaining the transparency that does not impair the feeling of opening. Further, since the window glass of the above embodiment has a high heat shielding effect,
When the window glass of the present embodiment is mounted on a sunroof window, the mounting of a sunshade for heat shielding can be omitted, the head clearance is secured by sunshadelessness, the feeling of openness is achieved, and the degree of freedom in designing the glass roof is reduced. An improvement can be obtained. [Effects of the Invention] As described above, according to the present invention, a colored transparent film and / or a transparent inner glass plate capable of suppressing transmission of visible light are disposed on the indoor side, and Since the heat ray reflective film formed on the indoor side of the outer glass sheet is covered and protected by the transparent film and / or the transparent inner glass sheet, it is possible to reduce the cooling load by suppressing the incidence of heat rays into the room. In addition to being able to increase the durability at the same time, it has a structure like a half mirror, so that it can be seen through from the inside of the car to the bright outside, and reflective when looking from the bright outside to the inside of the car. This makes it difficult to see through the vehicle, and therefore, it is possible to maintain the privacy inside the vehicle while obtaining a sense of openness. In addition, since the reflection when viewed from the inside of the vehicle can be reduced, it is possible to eliminate the anxiety during driving due to the reflection of road conditions such as street light. Furthermore, since it can be formed simply by being attached to the heat ray reflection film side of the outer glass provided on the inside of the vehicle, it is technically different from the case of forming an optical thin film having the same function. Simple simplification can also be realized at the same time. Moreover, when the color of the outer glass or the color of the heat ray reflective film is transparent when the outer glass is transparent, the same color as the window glass of other parts of the automobile may be used, for example, bronze, blue, green or gray. The use of a system is preferable in terms of design because a feeling of unity of each window glass can be obtained. Further, by matching the color tone of the window glass of the present invention with the color tone of the automobile, a sense of harmony can be enhanced.

BRIEF DESCRIPTION OF THE DRAWINGS FIGS. 1 to 5 are cross-sectional views showing an embodiment of a window glass for an automobile according to the present invention, FIG. 6 is a perspective view of an automobile in which the window glass of the present invention is applied to a sunroof, FIG. 7 is a sectional view showing a conventional example. DESCRIPTION OF SYMBOLS 1 ... Outer glass, 2 ... Heat reflection film, 4 ... Laminated intermediate film, 5
... Inner glass, 6 ... Shading pattern, 7 ... Polyethylene terephthalate film, 8 ... Automotive window glass

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-59-148654 (JP, A) JP-A-60-81047 (JP, A) JP-A-49-100105 (JP, A) 121010 (JP, U) Actually open 49-95624 (JP, U) (58) Fields investigated (Int. Cl. ⁶ , DB name) B60J 1/00-1/20

Claims (1)

(57) [Claims] A transparent outer glass having a heat ray reflective film formed on the vehicle interior, and a transparent film and / or a transparent inner glass laminated on the inner side of the outer glass so as to cover the heat ray reflective film. The transparent film and / or the transparent inner glass is colored so that the visible light transmittance is lower than the visible light transmittance of the outer glass and has a light-shielding function. An automotive window glass characterized by the following. 2. A transparent inner glass and a transparent laminated interlayer are laminated on the outer glass in order from the vehicle interior, and at least one of the transparent inner glass and the transparent laminated interlayer is laminated. 2. A window glass for an automobile according to claim 1, wherein said glass is colored so that its visible light transmittance is lower than that of said outer glass sheet. 3. For the outer glass, a transparent film made of a transparent polyethylene terephthalate film in order from the inside of the vehicle, a transparent inner glass, and a transparent laminated intermediate film are laminated, and the transparent film and 9. The method according to claim 8, wherein at least one of the transparent inner glass and the transparent laminated interlayer is colored so that its visible light transmittance is lower than that of the outer glass. The window glass for an automobile according to claim 1.