CN110869228B

CN110869228B - Automobile window glass

Info

Publication number: CN110869228B
Application number: CN201880045768.7A
Authority: CN
Inventors: 青木时彦; 平尾拓树
Original assignee: Asahi Glass Co Ltd
Current assignee: AGC Inc
Priority date: 2017-07-13
Filing date: 2018-06-22
Publication date: 2023-05-23
Anticipated expiration: 2038-06-22
Also published as: JPWO2019012962A1; WO2019012962A1; CN110869228A; JP7040526B2

Abstract

The invention provides a windshield of an automobile, which can reduce the load of an information transceiver represented by a camera and an information processing device caused by heat. The automotive window glass of the present invention is an automotive window glass in which an in-vehicle system capable of transmitting and receiving radio waves and/or optical signals to and from the outside of the vehicle is mounted in the vehicle, and is characterized by comprising a plate-shaped glass member and a shielding layer provided on the vehicle inner surface of the plate-shaped glass member along the outer periphery of the plate-shaped glass member, wherein the shielding layer has a protruding portion protruding in the in-plane direction from the center of the upper edge of the plate-shaped glass member, the protruding portion includes an opening having a signal transmission region transmitting the signal in response to the transmission and reception of the signal, and the low-emissivity layer is provided on the vehicle inner surface of the plate-shaped glass member so as to surround at least a portion of the signal transmission region along at least a portion of the outer periphery of the opening.

Description

Automobile window glass

Technical Field

The present invention relates to automotive glazing.

Background

In recent years, in-vehicle systems having information devices such as cameras mounted in vehicles are known, in which information signals such as road conditions are transmitted and received through a window glass (for example, a windshield of a vehicle) (see patent literature 1). These in-vehicle systems are advanced year by year, and various driving assistance such as notifying a driver of a danger can be performed by analyzing a captured image of an object obtained by a camera to distinguish between vehicles facing each other, vehicles ahead, pedestrians, traffic signs, lane boundaries, and the like.

In many cases, the camera of the in-vehicle system is provided near the upper center of the windshield and the like, and has a shielding layer. In this case, an optical opening is provided as a transmission region for transmitting and receiving an information signal in the shielding layer corresponding to the imaging range of the camera. That is, in many cases, a shielding layer is provided around a transmission region for transmitting and receiving an information signal (see patent document 2).

Prior art literature

Patent literature

Patent document 1: japanese patent laid-open publication 2016-107755

Patent document 2: japanese patent laid-open No. 2006-327381

Disclosure of Invention

Technical problem to be solved by the invention

However, in the case of mounting an information device such as a camera in a vehicle as in patent document 1 or patent document 2, communication is performed while performing calculation processing on image information or the like obtained by the camera, and thus, an in-vehicle system in which an information processing device is provided in addition to the camera is often employed. In recent years, it has become increasingly important and advanced to operate a mechanism for instantaneously suppressing a collision based on information obtained by a camera or to provide the mechanism with a function of assisting a driving operation of a driver.

On the other hand, the load on the information processing apparatus caused by the high speed and huge amount of information to be processed becomes a problem. Other home computers are also inevitably heated due to an increase in load on the information processing apparatus. Therefore, when heat generated by processing is received in addition to heat entering from the outside of the window glass of the automobile, the camera or the information processing device is overheated, and there is a problem that malfunction or no operation occurs.

The purpose of the present invention is to provide an automotive window glass that can reduce the load caused by heat in an in-vehicle system including an information transmitter/receiver device typified by a camera, an information processing device, and the like.

Technical proposal adopted for solving the technical problems

The automotive window glass of the present invention is an automotive window glass in which an in-vehicle system capable of transmitting and receiving radio waves and/or optical signals to and from the outside of the vehicle is mounted in the vehicle, and is characterized by comprising a plate-shaped glass member and a shielding layer provided on the vehicle inner surface of the plate-shaped glass member along the outer periphery of the plate-shaped glass member, wherein the shielding layer has a protruding portion protruding in the in-plane direction from the center of the upper edge of the plate-shaped glass member, the protruding portion includes an opening having a signal transmission region transmitting the signal in response to the transmission and reception of the signal, and the low-emissivity layer is provided on the vehicle inner surface of the plate-shaped glass member so as to surround at least a portion of the signal transmission region along at least a portion of the outer periphery of the opening.

ADVANTAGEOUS EFFECTS OF INVENTION

The present invention can provide an automotive window glass that can reduce a load due to heat in an in-vehicle system including an information transmitting/receiving device typified by a camera, an information processing device, and the like.

Drawings

Fig. 1 is a plan view of an embodiment of a windshield of the present invention.

Fig. 2 is a cross-sectional view of the windshield shown in fig. 1 taken along line X-X.

Fig. 3 is an enlarged plan view of another embodiment of a windshield of the present invention near the center of the upper edge.

Fig. 4 is a plan view illustrating an exemplary configuration of a low emissivity layer of a windshield in accordance with an embodiment of the present invention.

Fig. 5 is a plan view illustrating another configuration example of the low emissivity layer of the windshield in accordance with the embodiment of the present invention.

Fig. 6 is a plan view illustrating another configuration example of the low emissivity layer of the windshield of the embodiment of the present invention.

Fig. 7 is a cross-sectional view illustrating an example of the structure of a low emissivity layer of a windshield in accordance with an embodiment of the present invention.

Fig. 8 is a cross-sectional view illustrating another configuration example of the low emissivity layer of the windshield in accordance with the embodiment of the present invention.

Fig. 9 is a cross-sectional view illustrating another configuration example of the low emissivity layer of the windshield of the embodiment of the present invention.

Fig. 10 is a cross-sectional view illustrating another configuration example of the low emissivity layer of the windshield in accordance with the embodiment of the present invention.

Fig. 11 is a cross-sectional view illustrating another configuration example of the low emissivity layer of the windshield in accordance with the embodiment of the present invention.

Detailed Description

Embodiments of the present invention will be described below. The present invention is not limited to these embodiments, and the embodiments may be modified or changed without departing from the technical spirit and scope of the present invention.

Fig. 1 is a plan view of an embodiment of a windshield of the present invention. Fig. 2 is a cross-sectional view of the windshield shown in fig. 1 taken along line X-X. The automotive window glass of the present invention is an automotive window glass in which an in-vehicle system for transmitting and receiving radio waves and/or optical signals to and from the outside of the vehicle can be mounted in the vehicle, and is applicable to windshields, rear window glass, side window glass, sunroof glass, and the like, and is preferably used for windshields.

In the present specification, the expressions "upper" and "lower" refer to upper and lower sides, respectively, when the automotive window glass is mounted on a vehicle. The "upper portion" of the automotive window glass refers to an upper portion in the case where the automotive window glass is mounted on the vehicle, and the "lower portion" refers to a lower portion in the case where the automotive window glass is mounted on the vehicle.

In the present specification, the "peripheral edge portion" of the plate-like glass member refers to a region having a constant width from the outer periphery of the plate-like glass member toward the center of the main surface. In the present specification, the outer peripheral side of the main surface of the plate-like glass member as viewed from the central portion is referred to as the outer side, and the central portion side as viewed from the outer peripheral side is referred to as the inner side. In the present specification, the "end face" of the low-emissivity layer and the shielding layer means a face connecting one main surface and the other main surface, and the "end portion" means a portion having a constant width from the end face toward the center of the main surface.

The windshield 1 shown in fig. 1 and 2 includes a plate-shaped glass member 2, and a shielding layer 5 provided on an inner surface Sa of the plate-shaped glass member 2 along an outer periphery of the plate-shaped glass member 2 to shield visible light. The shielding layer 5 has a protruding portion 7 formed so as to protrude in the in-plane direction (downward) from the center of the upper edge of the plate-like glass member 2. The protruding portion 7 has an opening 4 having a signal transmission region 3 in the center portion, through which a signal of the vehicle-mounted system is transmitted and received. The low-emissivity layer 6 is provided on the vehicle interior surface Sa of the opening 4 so as to extend along at least a part of the outer periphery of the opening 4 and so as to surround at least a part of the signal transmission region 3. Fig. 1 is a plan view of the windshield 1 as seen from the vehicle interior side.

The mounting portion a of the in-vehicle system is shown by a broken line in fig. 1. The mounting portion a is located at the periphery of the opening portion 4 of the shielding layer 5. Fig. 2 shows a general configuration of the in-vehicle system 40 in a case where the in-vehicle system is mounted on the windshield 1 by a broken line. The in-vehicle system 40 includes an information transceiver 41, an information processor 42, and a housing 43 for housing these. The in-vehicle system 40 can mount the housing 43 on the mounting portion a via, for example, an adhesive layer 44. The frame 43 may be mounted on a bracket not shown, and in this case, the bracket may be mounted on the mounting portion a via the adhesive layer 44.

The shielding layer 5 is provided in a region of the vehicle interior surface Sa of the plate-like glass member 2 including at least the mounting portion a of the vehicle-mounted system. In windshields, the mounting portion a of the in-vehicle system is usually located at the upper portion of the windshield. The shielding layer 5 includes the mounting portion a and is provided in a region that does not obstruct the view of the driver.

In the windshield 1, the shielding layer 5 is provided at a peripheral edge portion on the vehicle inner surface Sa of the plate-like glass member 2. Therefore, the shielding layer 5 having the opening 4 and including the mounting portion a is provided as the protruding portion 7 in succession to the shielding layer 5 at the peripheral portion. The shielding layer 5 having the peripheral edge portion and the opening 4, and the shielding layer 5 including the mounting portion a may be provided at intervals. The shielding layer 5 may be formed in a band shape over the entire peripheral edge portion of the windshield 1 for shielding the vehicle body mounting portion, but the shielding layer 5 may be formed in a part of the peripheral edge portion, not necessarily on all 4 sides of the peripheral edge portion.

The shielding layer 5 may be made of a conventionally known material such as a black ceramic layer. The thickness of the shielding layer 5 is not particularly limited as long as it does not cause a problem in observability. The thickness of the shielding layer 5 is preferably about 8 to 20. Mu.m, more preferably 10 to 15. Mu.m.

The plate-like glass member 2 included in the windshield 1 is a laminated glass. The laminated glass as the plate-like glass member 2 is configured by bonding the in-vehicle glass plate 2A and the out-of-vehicle glass plate 2B via the intermediate adhesive layer 2C. The following describes the symbol of the laminated glass symbol 2 as the plate-like glass member 2. The in-vehicle glass plate 2A and the out-of-vehicle glass plate 2B are referred to as a glass plate 2A and a glass plate 2B, respectively.

In the case where the plate-like glass member 2 is a laminated glass, the shielding layer 5 is provided on the main surface on the opposite side of the intermediate adhesive layer 2C of the in-vehicle glass plate 2A, that is, on the in-vehicle surface Sa of the laminated glass 2. The shielding layer 5 may be provided on the main surface of the vehicle exterior glass plate 2B on the side of the intermediate adhesive layer 2C, if necessary. The shielding layer 5 may be provided on both the main surface of the vehicle interior glass plate 2A opposite to the intermediate adhesive layer 2C and the main surface of the vehicle exterior glass plate 2B opposite to the intermediate adhesive layer 2C.

As the 2

glass plates

2A and 2B in the laminated glass 2, conventionally known glass plates used for window glass of an automobile can be used. The

glass plates

2A and 2B are preferably glass plates manufactured by a known float process, for example. In the float process, a molten glass preform is floated on a molten metal such as tin and is formed into a glass plate having a uniform thickness and plate width by a strict temperature operation.

The thickness of the

glass plates

2A, 2B is not particularly limited, but is preferably 0.5mm to 3.0 mm. The thicknesses of the

glass plates

2A and 2B may be the same or different. When the thicknesses of the

glass plates

2A and 2B are different, the thickness of the in-vehicle glass plate 2A is preferably 0.3mm or more and 2.3mm or less. The in-vehicle glass plate 2A has good handleability when the plate thickness is 0.3mm or more, and the mass of the windshield 1 is not excessively large when the plate thickness is 2.3mm or less.

Further, by setting the plate thickness of the in-vehicle glass plate 2A to 0.3mm or more and 2.3mm or less, the glass quality (for example, residual stress) can be maintained. The thickness of the in-vehicle glass plate 2A is set to 0.3mm or more and 2.3mm or less, which is particularly effective in maintaining the glass quality (for example, residual stress) of the glass plate having a deep curvature. The thickness of the in-vehicle glass sheet 2A is more preferably 0.5mm to 2.1mm, still more preferably 0.7mm to 1.9 mm.

The thickness of the outer glass plate 2B is preferably 1.8mm to 3 mm. If the plate thickness of the outer glass plate 2B is 1.8mm or more, the strength such as the flying stone resistance is sufficient, and if it is 3mm or less, the mass of the windshield 1 is not excessively large, which is preferable in terms of fuel consumption of the vehicle. The thickness of the glass plate 2B outside the vehicle is more preferably 1.8mm to 2.8mm, and still more preferably 1.8mm to 2.6 mm. However, the thicknesses of the

glass plates

2A, 2B are not always fixed, and may be changed at different positions as needed. For example, one or both of the

glass plates

2A and 2B may have a wedge-shaped region, which is a cross-sectional view wedge-shaped region having a thicker thickness on the upper end side than on the lower end side in the vertical direction when the windshield 1 is mounted on a vehicle.

As an example of the composition of the glass constituting the

glass plates

2A, 2B, a composition comprising 50 to 80% of SiO in terms of mol% based on oxides can be exemplified ₂ 0 to 10 percent of B ₂ O ₃ 0.1 to 25 percent of Al ₂ O ₃ 3 to 30 percent of Li ₂ O+Na ₂ O+K ₂ O, mgO 0-25%, caO 0-25%, srO 0-5%, baO 0-5% and ZrO 0-5% ₂ 0 to 5 percent of SnO ₂ Is not particularly limited.

The composition of the intermediate adhesive layer 2C may be the same as that of an adhesive layer commonly used in conventional laminated glass, and for example, polyvinyl butyral (PVB) or Ethylene Vinyl Alcohol (EVA) may be used. In addition, a thermosetting resin that is in a liquid state before heating may be used as a constituent material of the intermediate adhesive layer 2C.

The information transmitting/receiving device 41 shown in fig. 2 is, for example, a camera or a sensor. The opening 4 in the projection 7 of the shielding layer 5 is provided to ensure the signal transmission region 3 through which a signal is transmitted when the information transmitting/receiving device 41 transmits and receives a signal of radio waves (300 MHz to 10 GHz) and/or light (380 nm to 1100 nm). The radio wave includes millimeter waves (30-300 GHz). The signal transmission region 3 can be applied to the use of the information transmitting/receiving device 41 for transmitting/receiving millimeter wave signals.

The shape and area of the signal transmission area 3 are determined by the information transceiver 41. Specifically, the signal transmission region 3 is formed without the shielding layer 5 on the plate-shaped glass member 2, and has the same transmission characteristics as those of the plate-shaped glass member 2, such as radio waves and light.

In the windshield 1, the solar radiation transmittance (Te) of the plate-like glass member 2 is preferably 60% or less and the visible light transmittance (Tv) is preferably 70% or more. The solar radiation transmittance (Te) is more preferably 55% or less, particularly preferably 48% or less. Further, the solar radiation reflectance (Re) is more preferably 5% or more, particularly preferably 7% or more. Also, ae (ae=100-Te-Re) representing the amount of heat absorption is preferably 20% or more, more preferably 40% or more, particularly preferably 45% or more.

The visible light transmittance (Tv) is more preferably 72% or more, particularly preferably 73% or more. The haze value of the signal transmission region 3 is preferably 1.0% or less, more preferably 0.8% or less, and particularly preferably 0.6% or less.

The solar radiation transmittance (Te), solar radiation reflectance (Re) and visible light transmittance (Tv) are values calculated by measuring transmittance and reflectance in a wavelength range including at least 300 to 2100nm by a spectrophotometer or the like using calculation formulas defined in JIS R3106 (1998) and JIS R3212 (1998), respectively. In the present specification, the solar radiation transmittance, solar radiation reflectance, and visible light transmittance refer to the solar radiation transmittance (Te), solar radiation reflectance (Re), and visible light transmittance (Tv) measured and calculated by the above-described methods, within the range not particularly limited.

In the signal transmission region 3, the visible light transmittance (Tv), the solar radiation transmittance (Te), the solar radiation reflectance (Re), and the haze value are not particularly limited, and may be the same as the plate-shaped glass member 2 as described above. In the signal transmission region 3, the infrared transmittance, specifically, the average transmittance in the range of 600 to 1100nm measured by a spectrophotometer or the like is preferably 30% or more, more preferably 40% or more.

The above-mentioned infrared transmittance is a characteristic required for the signal transmission region 3. Therefore, depending on the characteristics required for such a signal transmission region 3, only the signal transmission region 3 of the plate-like glass member 2 can be changed to characteristics different from those of the region other than the signal transmission region 3. For example, in the case where the plate-like glass member is the laminated glass 2, the constituent material of the intermediate adhesive layer 2C may be appropriately changed from the above-described material. The intermediate adhesive layer 2C corresponding to the signal transmission region 3 may be hollowed out, and a region other than the signal transmission region 3 and another intermediate adhesive layer may be formed. In addition, the signal transmission region 3 of the plate-like glass member 2 may be coated with a water repellent function, a hydrophilic function, an antifogging function, an insulating function, an electrothermal function, or the like.

The opening 4 is provided so as to include the entire area of the signal transmission region 3 in the area of the opening 4. In the windshield 1 shown in fig. 1 and 2, the opening 4 is a region having a larger area than the signal transmission region 3. The size of the opening 4 is set to a size such that the following low-emissivity layer 6 can be disposed between the outer periphery of the opening 4 and the outer periphery of the signal transmission region 3. The shape of the opening 4 is not particularly limited. The shape of the opening 4 may be similar to the shape of the signal transmission region 3, or may be different from the similar shape.

In the windshield 1, the shielding layer 5 may be omitted below the opening 4. Fig. 3 is an enlarged plan view showing the vicinity of the center of the upper edge in a modification of the windshield 1 in which the shielding layer 5 is not provided at the lower portion of the opening 4. As shown in fig. 3, when the lower shielding layer 5 is not present in the opening 4, a region surrounded by a virtual line connecting the lowermost ends of both side portions of the opening 4 and the shielding layer 5 is a region of the opening 4. That is, even in the case where the opening 4 does not have the lower shielding layer 5, the virtual line connecting the lowermost ends of both side portions of the opening 4 and the area surrounded by the shielding layer 5 include the entire area of the signal transmission area 3. The area and shape of the protruding portion 7 having the opening 4 formed therein are not particularly limited as long as the protruding portion has the opening 4.

The low-emissivity layer 6 is provided so as to extend along at least a part of the outer periphery of the opening 4, and is provided so as to surround at least a part of the signal transmission region 3. The low emissivity layer 6 has the effect of inhibiting the transfer of heat to the in-vehicle system 40.

As described above, the in-vehicle system 40 is fixed to the shielding layer 5 by, for example, adhering the frame 43 to the mounting portion a. This is due to the following considerations: the aesthetic appearance is enhanced by hiding the location of the stationary vehicle-mounted system 40; preventing deterioration of the adhesive layer 44 used in the fixed portion; and can be more stably fixed to the surface of the shielding layer 5 than to the surface of the plate-like glass member 2.

On the other hand, if the in-vehicle system 40 is fixed to the shielding layer 5 as described above, the distance between the in-vehicle system 40 and the shielding layer 5 becomes shorter, and the heat energy absorbed by the shielding layer 5 is more easily transmitted to the in-vehicle system 40 through the opening 4. In addition, in the case where the information transmitting/receiving device 41 is a camera, if the camera approaches the plate-like glass member 2, the closer the camera is, the larger the angle of view of the camera with respect to the opening 4 of the same size becomes. In the case where the camera is close to the plate-like glass member 2, a method of making the space between the camera and the plate-like glass member 2a closed structure is realistic, but if so, heat does not escape from the space, and this becomes a factor of causing a load on the in-vehicle system 40. Therefore, a strategy for suppressing such heat transfer from the opening 4 to the in-vehicle system 40 is required.

By providing the low-emissivity layer 6 so as to surround at least a part of the signal transmission region 3, the heat energy absorbed by the shielding layer 5 can be suppressed from being transmitted to the information transmitting/receiving device 41 or the information processing device 42 through the opening 4. In order to enhance the heat transfer suppressing effect, the low emissivity layer 6 is preferably provided so as to surround the signal transmission region 3 in a region corresponding to 10 to 100% of the entire circumference of the signal transmission region 3, and more preferably so as to surround the entire circumference of the signal transmission region 3.

The low-emissivity layer 6 is provided so as to surround the signal transmission region 3 and so as to extend along at least a part of the outer periphery of the opening 4 of the shielding layer 5. When the thickness of the low-emissivity layer 6 is the same, the larger the area thereof, the larger the heat transfer suppressing effect of the low-emissivity layer 6. Therefore, in order to exert the maximum effect, the low-emissivity layer 6 is preferably provided in the entire region between the outer periphery of the signal transmission region 3 and the outer periphery of the opening 4. On the other hand, in order to reliably secure the signal transmission region 3, it is preferable to provide the low-emissivity layer 6 at a predetermined distance from the outer periphery of the signal transmission region 3.

From the above point of view, the low-emissivity layer 6 is preferably a low-emissivity layer having a structure shown in a plan view of fig. 4, for example. The low-emissivity layer 6 shown in fig. 4 is formed so as to surround the entire periphery of the signal transmission region 3, and the outer periphery of the low-emissivity layer 6 is in contact with the outer periphery of the opening 4, while the inner periphery of the low-emissivity layer 6 is spaced apart from the outer periphery of the signal transmission region 3 by a predetermined distance. In addition, as in the windshield 1 shown in fig. 3, in the case where the shielding layer 5 is not provided in the lower portion of the opening 4, the low emissivity layer 6 may be provided along the 3 sides of the boundary between the opening 4 and the shielding layer 5. In this case, the low-emissivity layer 6 is formed so as to surround the outer periphery of the signal transmission region 3 except the lower portion thereof.

The width w of the low emissivity layer 6 is preferably 3 to 20mm. The width w is more preferably 5 to 15mm. Here, the width w of the low-emissivity layer 6 means a distance between the outer periphery and the inner periphery of the low-emissivity layer 6, and corresponds to a width from the outer periphery of the opening 4 of the shielding layer 5 toward the signal transmission region 3. Further, the distance L between the inner periphery of the low radiation layer 6 and the outer periphery of the signal transmission region 3 is the shortest distance L _min Preferably 5mm or more, as the distance L where the distance is the maximum _max Preferably 20mm or less.

The thickness T of the low emissivity layer 6 depends on the constituent material or manufacturing method of the low emissivity layer 6. The thickness of the low emissivity layer 6 is preferably 150 to 250nm in the case of a vapor deposition film typically produced by sputtering, and is preferably 3 to 20 μm in the case of firing a silver paste. In this specification, the thickness of the low-emissivity layer 6 refers to the maximum thickness in the region where the low-emissivity layer 6 is provided.

The emissivity of the low emissivity layer 6 is preferably 0.8 or less, more preferably 0.5 or less, further preferably 0.2 or less, and particularly preferably 0.1 or less. The emissivity of the low emissivity layer 6 can be measured by a method defined in JIS R3106.

The low emissivity layer 6 is preferably composed of a metal or metal oxide. Silver is preferable as the metal. As the metal oxide, tin-doped indium oxide (ITO) is preferable. The low-emissivity layer 6 is preferably formed of a low-emissivity film such as a silver paste fired film or an ITO film. The low emissivity layer 6 may be formed of a silver-based multilayer film in which a metal layer containing silver as a main component (hereinafter, also referred to as a silver layer) is sandwiched between dielectric layers. The dielectric layer in the silver-based multilayer film is a layer composed of a material containing an oxide, nitride, oxynitride, or the like of a metal as a main component. The ITO film or the silver-based multilayer film is a film produced by, for example, a sputtering method.

The low-emissivity layer 6 may be suitably used as long as it is a film having low emissivity. The low emissivity layer 6 is preferably formed by firing a silver paste, from the viewpoint of easy selective film formation in a desired region, or from the viewpoint of cost.

In order to improve the heat transfer suppressing effect, as in the low-emissivity layer 6 shown in fig. 4, the low-emissivity layer 6 may be formed in a frame shape so as to surround the entire circumference of the signal transmission region 3. As shown in a plan view in fig. 5, the low-emissivity layer 6 shown in fig. 4 may be cut at one portion of the frame shape, and may be configured to be electrically connected to an external power supply or other electrical mechanism. The low emissivity layer 6 shown in fig. 5 is connected to an external power source via 2 ends, for example, and can be heated by energization when the outside air temperature is low and the plate-like glass member 2 is easily fogged and/or frozen, so that the signal transmission region 3 is prevented from being fogged and/or frozen. In addition, when the outside air temperature is low, even if the low emissivity layer 6 is heated, little heat load is imposed on the in-vehicle system 40.

In addition, for example, if 2 ends of the low-emissivity layer 6 shown in fig. 5 are connected to an external power source and kept in an energized state, if the plate-like glass member 2 around the signal transmission region 3 is broken, the breakage can be detected by breaking the low-emissivity layer 6, which is preferable.

The film thickness of the low-emissivity layer 6 may be smaller in the vicinity of the signal transmission region 3 than in the other regions, or may be formed such that the vicinity of the signal transmission region 3 is formed in a dot pattern. Fig. 6 is a plan view showing an example of the low-emissivity layer 6 formed so that the area around the signal transmission area 3 is formed in a dot pattern. The low-emissivity layer 6 shown in fig. 6 may be the same as the low-emissivity layer 6 shown in fig. 4, except that the areas near the signal transmission areas 3 are formed in a dot pattern. By configuring the low-emissivity layer 6 in the manner shown in fig. 6, the boundary portion with the signal transmission region 3 can be formed without any gap, and the signal transmission region 3 is not visible from the outside. The shape of the dots in the dot pattern is not limited to a circle, and may be an ellipse, a rectangle, a polygon, a star, or the like. The dot pattern may be formed by making the portion of the dot transparent and providing a low-emissivity layer in the other portion.

The windshield 1 shown in fig. 1, 2 and 3 is an example in which the low emissivity layer 6 is formed so as to be in contact with the vehicle interior surface Sa of the plate-like glass member 2. The low radiation layer 6 may be formed so as to contact the inner surface of the shielding layer 5 formed on the inner surface Sa of the plate-like glass member 2 within a range where the low radiation layer 6 is provided so as to surround at least a part of the signal transmission region 3 along at least a part of the outer periphery of the opening 4. That is, in the present invention, the "low-emissivity layer is provided on the vehicle interior surface of the plate-like glass member" includes a case where there is a separate layer between the low-emissivity layer and the vehicle interior surface of the plate-like glass member.

For example, the planar shape is a frame shape or a shape in which one portion of the frame shape is cut as in fig. 4 or 5, but the low radiation layer 6 whose inner periphery coincides with the outer periphery of the opening 4 may be provided on the vehicle interior surface of the shielding layer 5 so that the inner periphery coincides with the outer periphery of the opening 4. Similar to the low emissivity layer 6 shown in fig. 6, the low emissivity layer may be provided on the vehicle interior surface of the shielding layer 5 so that the inner periphery thereof coincides with the outer periphery of the opening 4, but the effect of the dot pattern cannot be exhibited, which is not preferable from the viewpoint of productivity. In the case where the low radiation layer 6 is provided on the vehicle interior surface of the shielding layer 5 so that the inner periphery thereof coincides with the outer periphery of the opening 4, the dot pattern is preferably provided on the outside as shown in fig. 10 described later, for example.

A configuration example of a cross section of the low-emissivity layer 6 will be described with reference to fig. 7, 8, 9, 10, and 11. Fig. 7, 8, 9, 10 and 11 are cross-sectional views of the respective configuration examples in the vertical direction in the vicinity of the opening 4 in the upper portion of the windshield 1.

In the configuration example of the windshield 1 shown in fig. 7, the planar shape of the low emissivity layer 6 is, for example, the same frame-like shape as shown in fig. 4. The low radiation layer 6 shown in fig. 7 is provided so that the outer end surface contacts the end surface of the shielding layer 5 and the inner end surface faces the outer periphery of the signal transmission region 3. The low emissivity layer 6 shown in fig. 7 has a substantially uniform thickness T throughout the layer. The thickness T, width w, and distance L between the inner end surface and the outer periphery of the signal transmission region 3 of the low radiation layer 6 shown in fig. 7 may be the same as those described above.

The windshield 1 shown in fig. 8 is a configuration example in which the low emissivity layer 6 is provided so as to cover the end of the shielding layer 5. The low radiation layer 6 shown in fig. 8 is provided so that the outer end surface exceeds the end surface of the shielding layer 5 and is located on the vehicle inner surface of the shielding layer 5, in other words, so that the outer end portion is overlapped with the inner end portion of the shielding layer 5 and the inner end surface is provided so as to face the outer periphery of the signal transmission region 3. The portion of the low-emissivity layer 6 that is provided at the inner end of the shielding layer 5 is formed to have a thickness T1 substantially equal to the thickness T of the other portions. The planar shape of the low radiation layer 6 shown in fig. 8 is, for example, a frame-like shape, and has a larger width when viewed from the inside of the vehicle than the low radiation layer 6 shown in fig. 7. In the case where the low radiation layer 6 has a cross-sectional shape shown in fig. 8, the shape of the plane viewed from the outside of the vehicle is the same as that of the low radiation layer 6 having a cross-sectional shape shown in fig. 7, and the same is true in terms of aesthetic properties as 2.

The thickness T of the low-emissivity layer 6 shown in fig. 8 and the distance L between the inner end surface and the outer periphery of the signal transmission region 3 may be the same as described above. The width w of the low radiation layer 6 shown in fig. 8 may be larger than the width ws of the overlapping portion of the end portions. The width ws of the overlapping portion of the end portions is preferably about 2 to 5mm, for example. In the case of firing the silver paste to form a film, the thickness T1 of the low emissivity layer 6 in the overlapping portion of the end portions is preferably about 3 to 20 μm, which is the same as the thickness T.

The low radiation layer 6 shown in fig. 8 is provided so as to cover the end portion of the shielding layer 5, thereby more effectively suppressing the transfer of the heat energy absorbed by the shielding layer 5 to the in-vehicle system 40 including the camera and the like through the opening 4.

The low-emissivity layer 6 shown in fig. 5 and 6 may be configured such that the outer end surface of the low-emissivity layer 6 contacts the end surface of the shielding layer 5, as in the case described above, or such that the outer end of the low-emissivity layer 6 overlaps the inner end of the shielding layer 5.

In the configuration example of the windshield 1 shown in fig. 9, the planar shape of the low emissivity layer 6 is, for example, the same frame-like shape as shown in fig. 4, but the inner periphery thereof is substantially the same size as the outer periphery of the opening 4. The low radiation layer 6 shown in fig. 9 is provided on the vehicle interior surface of the shielding layer 5 so that the position of the inner end surface substantially coincides with the position of the inner end surface of the shielding layer 5 and the entire surface overlaps with the shielding layer 5. That is, in the configuration shown in fig. 9, the low-emissivity layer 6 is not provided in the opening 4. That is, in the case where the low-emissivity layer 6 has a cross-sectional shape shown in fig. 9, the low-emissivity layer 6 cannot be seen from the outside of the vehicle, and is preferable from the viewpoint of aesthetic appearance.

In the configuration shown in fig. 9, the opening 4 and the signal transmission region 3 may have substantially the same area. On the other hand, as in fig. 4, in order to reliably secure the signal transmission region 3, it is preferable to provide the low-emissivity layer 6 at a predetermined distance L from the outer periphery of the signal transmission region 3. Therefore, in the configuration shown in fig. 9, the distance L between the inner periphery of the low radiation layer 6 and the outer periphery of the signal transmission region 3 is the shortest distance L _min Preferably 5mm or more, as the distance L where the distance is the maximum _max Preferably 20mm or less.

In the configuration shown in fig. 9, the width w of the low-emissivity layer 6 is a distance between the outer periphery and the inner periphery of the low-emissivity layer 6, and can be appropriately adjusted according to the formation region of the shielding layer 5. The width w of the low emissivity layer 6 may be preferably 3 to 50mm, more preferably 5 to 30mm. The width w of the low-emissivity layer 6 may be the same or different throughout the frame shape. For example, the width w of the low-emissivity layer 6 in the lower portion may be set smaller than the width w of the low-emissivity layer 6 in the upper portion or the left and right side portions along with the formation region of the shielding layer 5. From the standpoint of adhesion, it is preferable that the mounting portion a of the in-vehicle system 40 does not overlap with the formation region of the low-emissivity layer 6. In the configuration shown in fig. 9, when the thickness T of the low emissivity layer 6 is a vapor deposited film as described above, 150 to 250nm is preferable, and when the silver paste is baked into a film, 3 to 20 μm is preferable.

In addition, the low emissivity layer 6 needs to be provided further inside the vehicle than the shielding layer 5. This is because, for example, in the case where the shielding layer 5 is formed of 2 layers and the low-emissivity layer 6 is sandwiched therebetween, heat energy is transmitted from the shielding layer 5 on the vehicle outside to the shielding layer 5 on the vehicle inside by the low-emissivity layer 6.

In the configuration example of the windshield 1 shown in fig. 10, the planar shape of the low emissivity layer 6 is, for example, a frame shape, but the inner periphery thereof is substantially uniform in size with the outer periphery of the opening 4. The low radiation layer 6 shown in fig. 10 is provided on the vehicle interior surface of the shielding layer 5 so that the position of the inner end surface substantially coincides with the position of the inner end surface of the shielding layer 5 and the entire surface overlaps with the shielding layer 5. The low-emissivity layer 6 shown in fig. 10 is an example in which a region distant from the outer periphery of the opening 4 is formed in a dot pattern. The shape of the dots in the dot pattern may be the same as described above.

In the low-emissivity layer 6 shown in fig. 10, the dot pattern is configured such that the dot width decreases (w 4 < w3 < w 2) as the dot pattern is further away from the outer periphery of the mouth portion 4, and the distance between dots increases. The region indicated by the width w1 in the low-emissivity layer 6 is a region where dots are not formed. That is, the low-emissivity layer 6 shown in fig. 10 has a structure in which the area of the dot-shaped region is smaller as the distance from the outer periphery of the mouth portion 4 increases. In other words, the low-emissivity layer 6 shown in fig. 10 is configured such that the proportion of the area of the shielding layer 5 covered by the low-emissivity layer 6 decreases as the distance from the outer periphery of the mouth portion 4 increases. The reduction in the proportion of the area may be stepwise or continuous. The thickness T, width w, and distance L between the inner end surface and the outer periphery of the signal transmission region 3 of the low-emissivity layer 6 shown in fig. 10 may be the same as those described for the low-emissivity layer 6 shown in fig. 9.

In the configuration example of the windshield 1 shown in fig. 11, the planar shape of the low emissivity layer 6 is, for example, a frame shape in which the low emissivity layer 6 shown in fig. 10 substantially coincides with the outer periphery and the inner periphery, and is provided on the vehicle interior surface of the shielding layer 5 in the same manner as the low emissivity layer 6 shown in fig. 10. The low-emissivity layer 6 shown in fig. 11 has a smaller thickness in a region away from the opening 4 than in a region close to the opening 4. Specifically, when the height (thickness) of the inner end surface of the low radiation layer 6 is T and the height (thickness) of the outer end surface is T2, the relationship of T > T2 is satisfied. Thus, the low-emissivity layer 6 shown in fig. 11 has a structure in which the thickness decreases as it is farther from the outer periphery of the mouth portion 4. The decrease in thickness of the low emissivity layer 6 may be stepwise or continuous.

The width w of the low-emissivity layer 6 shown in fig. 11 and the distance L between the inner end surface and the outer periphery of the signal transmission region 3 may be the same as that described for the low-emissivity layer 6 shown in fig. 9. As shown in fig. 10, the low-emissivity layer 6 may be formed in a dot pattern in a region distant from the outer periphery of the opening 4, or may be formed such that the ratio of the area of the low-emissivity layer 6 covering the shielding layer 5 decreases as the low-emissivity layer is distant from the outer periphery of the opening 4, and the thickness of the low-emissivity layer 6 decreases as the low-emissivity layer is distant from the outer periphery of the opening 4.

As shown in fig. 10 or 11, the radiation of thermal energy can be effectively prevented by providing a configuration in which the proportion of the area of the low radiation layer 6 formed on the vehicle inner surface of the shielding layer 5 to cover the shielding layer 5 decreases as it goes away from the outer periphery of the mouth 4, a configuration in which the thickness of the low radiation layer 6 formed on the vehicle inner surface of the shielding layer 5 decreases as it goes away from the outer periphery of the mouth, or a combination of these configurations. Further, by using these components alone or in combination for the windshield 1, even if there is a difference in thermal expansion coefficient between the shielding layer 5 and the low emissivity layer 6, residual stress generated in the plate-like glass member 2 can be reduced, and impact resistance can be improved.

The installation of the vehicle-mounted system for an automobile window glass according to the present invention can be performed as described above, for example, as shown in fig. 2. That is, for example, the in-vehicle system 40 is fixed to the shielding layer 5 by bonding with an adhesive or the like. In addition, a sealing portion may be provided to seal a space between the information transmitting/receiving device 41 such as a camera and the vehicle-inner main surface of the plate-like glass member 2 when the in-vehicle system 40 is mounted. The sealing portion may be shaped to fit the outer diameter width of the information transmitting/receiving device 41, or may be shaped to seal the entire space formed between the vehicle-mounted system 40 and the plate-like glass member 2.

When the sealing portion is sealed as described above, a sealed space is provided between the information transmitting/receiving device 41 and the plate-like glass member 2, and the space is not circulated with the outside air, and is an environment that is not affected by a change in temperature or humidity in the vehicle interior. Therefore, fogging such as dew condensation is less likely to occur on the lens surface of the information transmitting/receiving device 41 such as a camera or the signal transmission region 3. On the other hand, in order that the heat energy from the outside does not escape, it is important to suppress the transfer of the heat energy to the space itself. The automotive window glass according to the present embodiment can effectively suppress the transfer of heat energy by providing the low-emissivity layer around the opening portion of the shielding layer.

As an example in the sealing portion, it is desirable to decompress a sealed space sealed by the sealing portion. By the decompression, the moisture that can exist in the closed space can be reduced.

As another example, a liquid or gel having a refractive index of ±10% or less with respect to the plate-like glass member 2 may be filled in the sealed space sealed with the sealing portion. The liquid or gel is, for example, a matching oil or gel, and there are refractive index matching agents, and the like. By filling the liquid or gel, moisture in the closed space can be removed.

(method for producing automobile Window glass)

The automotive window glass of the present invention can be produced by a conventionally used known technique. A method for manufacturing an automotive window glass according to the present invention will be described below with reference to a windshield 1 shown in fig. 1 as an example. In the windshield 1, the plate-like glass member 2 is a laminated glass.

In manufacturing the laminated glass 2, first, an intermediate adhesive layer 2C is interposed between the inner glass plate 2A and the outer glass plate 2B, and a laminated glass precursor is prepared as a laminated glass before press bonding. The laminated glass precursor is placed in a vacuum bag, such as a rubber bag, which is connected to an evacuation system. While vacuum suction (deaeration) is performed so that the pressure in the vacuum bag reaches a vacuum degree of about-65 to-100 kPa (absolute pressure of about 36 to 1 kPa), pre-bonding (pre-bonding) is performed at a temperature of about 70 to 110 ℃, and then the pre-bonded laminated glass precursor is placed in an autoclave, and main bonding (main press bonding) is performed by heating and pressurizing at a temperature of about 120 to 150 ℃ and a pressure of about 0.98 to 1.47MPa, whereby laminated glass 2 can be obtained.

On the vehicle inner surface Sa of the laminated glass 2, a shielding layer 5 made of black ceramic is formed, for example, by a conventionally known method. The black ceramic layer 5 is specifically a black ceramic layer formed by adding a powder of a heat-resistant black pigment to a resin together with a low-melting glass powder, kneading the mixture in a solvent, applying the mixture to a predetermined region of the vehicle interior surface Sa of the laminated glass 2 by printing or the like, and heating and sintering the mixture. The black pigment used for forming the black ceramic layer may contain a combination of pigments that are black by a combination of a plurality of colored pigments. The thickness of the masking layer 5 is as described above.

When the low emissivity layer 6 is formed by firing a silver paste, the silver paste may be applied to a predetermined region of the inner surface Sa of the laminated glass 2 by printing or the like, and heated and fired. The silver paste can be prepared by adding silver powder and low-melting glass powder to a resin and a solvent, and kneading the mixture. In the silver paste, the ratio of the silver powder to the low melting point glass powder is appropriately adjusted to obtain the emissivity required in the obtained low emissivity layer 6.

The shielding layer 5 and the low emissivity layer 6 can be heated and sintered simultaneously after printing the black ceramic paste as the shielding layer 5 and the silver paste as the low emissivity layer 6, respectively, and this method is preferable from the viewpoint of productivity. In this case, according to the above embodiment, when the low emissivity layer 6 and the shielding layer 5 do not have an overlapping portion, printing of the black ceramic paste and printing of the silver paste may be performed first, and printing of the black ceramic paste is generally performed first. In the case where printing of the black ceramic paste and printing of the silver paste can be performed simultaneously, they may be performed simultaneously. Further, if necessary, the black ceramic paste may be printed and fired to form the shielding layer 5, and then the silver paste may be printed and fired to form the low emissivity layer 6.

When a silver-based multilayer film and an ITO film are used as the low emissivity layer 6, the silver-based multilayer film and the ITO film can be typically formed by sputtering. As the film forming method, for example, a physical vapor deposition method (vacuum vapor deposition method, ion plating method), a chemical vapor deposition method (thermal CVD method, plasma CVD method, photo CVD method), an ion beam sputtering method, and the like other than the sputtering method are also used.

In this case, after the shielding layer 5 is formed, the low-emissivity layer 6 is formed after masking in order to selectively form the low-emissivity layer 6 in a predetermined region. In contrast, in the case of firing the silver paste to form a film, the silver paste having a viscosity can be easily applied to a predetermined region without masking, which is preferable.

The automotive window glass according to the embodiment of the present invention has been described above using the drawings and the like by taking a windshield as an example, but the automotive window glass according to the present invention is not limited thereto. The design may be changed or modified within a range not departing from the technical spirit and scope of the present invention.

Industrial applicability

The automotive window glass of the present invention is suitable for an automotive window glass in which an information processing device is mounted on the inside of an automobile, particularly a windshield, among automotive window glasses that transmit and receive information signals.

Symbol description

1. Windshield glass

2. Plate-like glass member

3. Signal penetration region

4. An opening part

5. Masking layer

6. A low emissivity layer.

Claims

1. An automotive window glass in which an in-vehicle system for transmitting and receiving radio waves and/or optical signals to and from the outside of a vehicle can be installed in the vehicle, characterized in that,

has the following characteristics of

Plate-like glass member

A shielding layer provided on an inner surface of the plate-shaped glass member along an outer periphery of the plate-shaped glass member,

the shielding layer has a protruding portion protruding in an in-plane direction from the center of the upper edge of the plate-like glass member,

the protruding portion includes an opening portion having a signal transmission region transmitting the signal in response to the transmission and reception of the signal,

the low-emissivity layer is provided on the vehicle interior surface of the plate-shaped glass member so as to extend along at least a part of the outer periphery of the opening and so as to surround at least a part of the signal transmission region.

2. A glazing for an automobile as claimed in claim 1 wherein the low emissivity layer is comprised of a metal or metal oxide.

3. The automotive glazing of claim 1 or 2, wherein the low emissivity layer is formed from a fired silver paste film.

4. A window glass for an automobile according to claim 1 or 2, wherein the low-emissivity layer is formed of an ITO film.

5. A window glass for an automobile according to claim 1 or 2, wherein the low-emissivity layer is provided so as to cover an end portion of the shielding layer.

6. A window glass for an automobile according to claim 1 or 2, wherein the low-emissivity layer is provided in a dot-like manner in a region in the vicinity of the signal transmission region.

7. A glazing for an automobile as claimed in claim 1 or claim 2 wherein the sheet glass member is a laminated glass, and is a windscreen.

8. A window glass for an automobile according to claim 1 or 2, wherein the low-emissivity layer is provided so as to surround the entire circumference of the signal transmission region.

9. A window glass for an automobile according to claim 1 or 2, wherein the low-emissivity layer is connected to a heatable energizing mechanism for preventing fogging and/or icing of the plate-like glass member.

10. The automotive window glass according to claim 1 or 2, wherein the low-emissivity layer is connected to an energizing mechanism that can detect when the plate-like glass member is broken.

11. A glazing for an automobile as claimed in claim 1 or claim 2 wherein the emissivity of the low emissivity layer is less than 0.8.

12. A window glass for an automobile according to claim 1 or 2, wherein the low-emissivity layer is formed on the vehicle interior surface of the shielding layer such that the proportion of the area of the low-emissivity layer covering the shielding layer decreases with distance from the outer periphery of the opening.

13. A window glass for an automobile according to claim 1 or 2, wherein the low-emissivity layer is formed on the vehicle interior surface of the shielding layer such that the thickness of the low-emissivity layer decreases with distance from the outer periphery of the opening.