windshield

Abstract

To provide a windshield making an image projected to the windshield by a HUD device hardly be affected by light from outside a vehicle.SOLUTION: A windshield to which information related at least to a vehicle is projected by light emitted from a head-up display device includes: an outer glass plate; an inner glass plate facing the outer glass plate; an interlayer film for adhering the inner glass plate and the outer glass plate; a first shield layer arranged in the peripheral edge part at least one of the outer glass plate and the inner glass plate; and a second shield layer which is arranged in the inner area than the first shield layer at least in one of the outer glass plate and the inner glass plate, and to which the information related to the vehicle is projected.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a windshield on which at least information relating to a vehicle is projected by light emitted from a head-up display device (HUD device). [Background technology]

[0002] Patent Document 1 discloses a windshield that projects light from a HUD device and displays various information related to the automobile. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Special Publication No. 2014-24752 Summary of the Invention [Problem to be solved by the invention]

[0004] As described above, the image projected on the windshield includes information that the driver must see, such as a speed display. However, the area of ​​the windshield where the projected image is displayed also transmits light from outside the vehicle, so there is a problem that the projected image is difficult to see due to the light from outside the vehicle. The present invention has been made to solve this problem, and has an object to provide a windshield that can make the image projected on the windshield by the HUD device less susceptible to the influence of light from outside the vehicle. [Means for solving the problem]

[0005] Item 1. A windshield on which at least information about a vehicle is projected by light emitted from a head-up display device, An outer glass plate; an inner glass plate facing the outer glass plate; an interlayer film that bonds the inner glass sheet and the outer glass sheet; A first shielding layer disposed on a peripheral portion of at least one of the outer glass sheet and the inner glass sheet; A second shielding layer is disposed in an area inside the first shielding layer in at least one of the outer glass sheet and the inner glass sheet, and information about the vehicle is projected onto the second shielding layer. Equipped with a windshield.

[0006] Item 2. The upper end of the second shielding layer is Below the reduced test area B specified in JIS R3212 (2021) JA.1.1.4b, or 25 mm below the bottom edge of the expanded test area B as specified in JIS R3212 (2021) JA.1.1.4b Item 1. The windshield according to item 1, wherein the windshield is disposed on any one of the above.

[0007] Item 3. The first shielding layer is disposed on at least the vehicle interior surface of the inner glass sheet, of the vehicle interior surface of the outer glass sheet or the vehicle interior surface of the inner glass sheet; Item 2. The windshield according to item 1, wherein the second shielding layer is disposed at least on a surface of the inner glass sheet other than the surface facing the vehicle interior side.

[0008] Item 4. The first shielding layer is disposed on at least the vehicle interior surface of the inner glass sheet, of the vehicle interior surface of the outer glass sheet or the vehicle interior surface of the inner glass sheet; Item 2. The windshield according to item 1, wherein the first shielding layer is disposed at least on the same plane as a plane on which the second shielding layer is disposed.

[0009] Item 5. The windshield according to item 4, wherein the first shielding layer and the second shielding layer are connected.

[0010] Item 6. The windshield according to item 1 or 2, wherein the second shielding layer is disposed on an inner surface of the outer glass sheet.

[0011] Item 7. The windshield according to item 6, wherein a reflective film is disposed on an interior surface of the inner glass plate facing the vehicle.

[0012] Item 8. The windshield according to item 7, wherein a difference between a refractive index of the inner glass sheet and a refractive index of the intermediate film overlapping the second shielding layer is greater than a difference between a refractive index of the intermediate film overlapping the second shielding layer and a refractive index of the second shielding layer.

[0013] Item 9. The windshield according to item 7, wherein the reflective film covers a portion of the first shielding layer.

[0014] Item 10. The windshield according to item 1 or 2, wherein the information about the automobile includes at least one of a speedometer or an odometer.

[0015] Item 11. The windshield according to item 1 or 2, wherein the second shielding layer is disposed on the lower side when the windshield is mounted on a vehicle.

[0016] Item 12. The windshield according to item 1 or 2, wherein the light is P-polarized.

[0017] Item 13. One or more layers of reflective film are arranged on the vehicle interior surface of the inner glass plate, Item 13. The windshield according to item 12, wherein when an incident angle of light irradiated from the head-up display device is larger than the Brewster angle at the inner glass plate, a refractive index of an outermost surface layer of the reflective film is smaller than a refractive index of the inner glass plate.

[0018] Item 14. One or more layers of reflective film are arranged on the surface of the inner glass plate facing the vehicle interior, Item 13. The windshield according to item 12, wherein when an incident angle of light irradiated from the head-up display device is smaller than the Brewster angle at the inner glass plate, a refractive index of an outermost surface layer of the reflective film is larger than a refractive index of the inner glass plate.

[0019] Item 15. The windshield according to item 1 or 2, further comprising an illumination area where light from a second head-up display device is irradiated and projected onto an area where external light is transmitted and incident and where the first shielding layer and the second shielding layer are not disposed.

[0020] Item 16. The windshield according to item 15, wherein on the vehicle interior side of the inner glass sheet, the reflectance of the irradiated area is smaller than the reflectance of an area where the first shielding layer and the second shielding layer are provided.

[0021] Item 17. The second shielding layer is formed on the vehicle interior surface of the outer glass sheet or the vehicle exterior surface of the inner glass sheet, Item 3. The windshield according to item 1 or 2, wherein the second shielding layer has a lower gloss than the first shielding layer. Effect of the Invention

[0022] According to the present invention, it is possible to make the image projected onto the windshield by the HUD device less susceptible to the influence of light from outside the vehicle. [Brief description of the drawings]

[0023] [Figure 1] 1 is a front view of a windshield according to an embodiment of the present invention. [Diagram 2] FIG. 2 is a cross-sectional view of FIG. [Diagram 3] FIG. 2 is a cross-sectional view of a laminated glass. [Figure 4] FIG. 2 is a cross-sectional view showing the projection of an image by a HUD device. [Diagram 5] FIG. 1 is a block diagram of an image processing device. [Figure 6] FIG. 1 is a cross-sectional view of a windshield provided with a reflective film. [Figure 7] The relationship between the angle of incidence and reflectance is quite rough. [Figure 8] FIG. 1 is a cross-sectional view showing the projection of an image by an AR-HUD device. [Figure 9]FIG. 2 is a front view of a windshield onto which an image is projected by an AR-HUD device. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0024] Hereinafter, an embodiment of a windshield of the present invention will be described with reference to the drawings. Fig. 1 is a plan view of the windshield, and Fig. 2 is a cross-sectional view of Fig. 1. For ease of explanation, the up-down direction in Fig. 1 will be referred to as "up-down", "vertical", and "length", and the left-right direction in Fig. 1 will be referred to as "left-right". Fig. 1 illustrates an example of a windshield as seen from the inside of the vehicle. That is, the front side of the paper in Fig. 1 is the inside of the vehicle, and the back side of the paper in Fig. 1 is the outside of the vehicle.

[0025] As shown in Figures 1 and 2, this windshield 1 has a substantially rectangular laminated glass 10 and is installed on the vehicle body in an inclined state. A first shielding layer 110 and a second shielding layer 120 that block the view from outside the vehicle are laminated on this laminated glass 10. In addition, an imaging device 2 with a built-in camera for photographing the situation outside the vehicle is attached to the first shielding layer 110 via a bracket (not shown). A photographing window 113 is provided in the first shielding layer 110 at a position corresponding to the photographing device 2, and the photographing device 2 can photograph the situation outside the vehicle through this photographing window 113.

[0026] An image processing device 3 is connected to the photographing device 2, and images captured by the photographing device 2 are processed by this image processing device 3. The photographing device 2 and the image processing device 3 configure an in-vehicle system 5 (see FIG. 5), and this in-vehicle system 5 can provide various information to passengers in accordance with the processing of the image processing device 3.

[0027] Furthermore, a head-up display device (hereinafter, referred to as HUD device) 500 is provided inside the vehicle. This HUD device 500 projects information such as vehicle speed and other information onto the windshield by emitting image light such as vehicle speed, other characters, figures, and the like.

[0028] 4, the above-mentioned second shielding layer 120 is disposed in an area irradiated with light from the HUD device 500. Each component will be described below.

[0029] <1. Laminated glass> <1-1. Glass plate> First, the outer glass plate 11 and the inner glass plate 12 will be described. The outer glass plate 11 and the inner glass plate 12 can be made of known glass plates, and can also be made of heat absorbing glass, general clear glass, green glass, dark green glass, or UV green glass. However, these glass plates 11 and 12 need to achieve a visible light transmittance that meets the safety standards of the country in which the automobile is used. For example, the outer glass plate 11 can ensure a required solar radiation absorptance, and the inner glass plate 12 can adjust the visible light transmittance to meet the safety standards. Examples of clear glass, heat absorbing glass, and soda lime glass are shown below.

[0030] (Clear glass) SiO 2 :70~73% by mass Al 2 O 3 :0.6~2.4% by mass CaO: 7~12% by mass MgO: 1.0~4.5% by mass R 2 O: 13 to 15 mass% (R is an alkali metal) Fe 2 O 3 Total iron oxide (T-Fe 2 O 3 ):0.08~0.14% by mass

[0031] (Heat absorbing glass) The composition of heat absorbing glass is, for example, based on the composition of clear glass, Fe 2 O 3 Total iron oxide (T-Fe 2 O 3 ) is 0.4 to 1.3 mass%, and CeO 2 The ratio of TiO is 0 to 2 mass%.2 The ratio of is 0 to 0.5 mass%, and the glass framework component (mainly SiO 2 Or Al 2 O 3 ) to T-Fe 2 O 3 , CEO 2 and TiO 2 The composition can be reduced by the increase in

[0032] (Soda-lime glass) SiO 2 :65~80% by mass Al 2 O 3 :0~5% by mass CaO: 5~15% by mass MgO: 2% by mass or more NaO: 10~18% by mass K 2 O: 0~5% by mass MgO+CaO: 5~15% by mass Na 2 O+K 2 O: 10~20% by mass SO 3 :0.05~0.3 mass% B 2 O 3 :0~5% by mass Fe 2 O 3 Total iron oxide (T-Fe 2 O 3 ):0.02~0.03% by mass

[0033] (Green Glass) SiO 2 :65~80% by mass Al 2 O 3 :0~5% by mass CaO: 5~15% by mass MgO: 2% by mass or more NaO: 10~18% by mass K 2 O: 0~5% by mass MgO+CaO: 5~15% by mass Na 2 O+K 2O: 10~20% by mass SO 3 :0.05~0.3 mass% B 2 O 3 :0~5% by mass Fe 2 O 3 Total iron oxide (T-Fe 2 O 3 ):0.4~0.6% by mass

[0034] (dark green glass) SiO 2 :65~80% by mass Al 2 O 3 :0~5% by mass CaO: 5~15% by mass MgO: 2% by mass or more NaO: 10~18% by mass K 2 O: 0~5% by mass MgO+CaO: 5~15% by mass Na 2 O+K 2 O: 10~20% by mass SO 3 :0.05~0.3 mass% B 2 O 3 :0~5% by mass Fe 2 O 3 Total iron oxide (T-Fe 2 O 3 ):0.7~1.3% by mass

[0035] The visible light transmittance of each of the glass plates 11 and 12 can also be adjusted. 2 O 3 By adjusting the content of Fe, the glass plates 11 and 12 can be colored, and the visible light transmittance can be adjusted. 2 O 3 When the content of Fe is high, the glass is colored green, resulting in the above-mentioned green glass or dark green glass. 2 O 3When the content is low, the above-mentioned clear glass is obtained.

[0036] The thickness of the laminated glass 10 according to this embodiment is not particularly limited. However, the total thickness of the outer glass sheet 11 and the inner glass sheet 12 can be, for example, 2.1 to 6 mm. From the viewpoint of weight reduction, the total thickness of the outer glass sheet 11 and the inner glass sheet 12 is preferably 2.4 to 3.8 mm, more preferably 2.6 to 3.4 mm, and particularly preferably 2.7 to 3.2 mm.

[0037] The outer glass sheet 11 is primarily required to be durable and impact resistant against external obstacles, and as a windshield for an automobile, it is required to have impact resistance against flying objects such as pebbles. On the other hand, the thicker the sheet, the heavier it becomes, which is not preferable. From this viewpoint, the thickness of the outer glass sheet 11 is preferably 1.8 to 2.3 mm, and more preferably 1.9 to 2.1 mm. The thickness to be adopted can be determined according to the application of the glass.

[0038] The thickness of the inner glass plate 12 can be equal to that of the outer glass plate 11, but can be smaller than that of the outer glass plate 11, for example, to reduce the weight of the laminated glass 10. Specifically, in consideration of the strength of the glass, the thickness is preferably 0.6 to 2.0 mm, more preferably 0.8 to 1.6 mm, and particularly preferably 1.0 to 1.4 mm. Furthermore, the thickness of each of the glass plates 11, 12 will be described later.

[0039] As described later in detail, the laminated glass 10 is curved so as to be convex toward the outside of the vehicle, and in this case, the thickness is measured at two positions above and below a center line extending vertically through the center in the left-right direction of the laminated glass 10. The measuring device is not particularly limited, and for example, a thickness gauge such as SM-112 manufactured by Techclock Corporation can be used. During measurement, the laminated glass 10 is placed so that the curved surface thereof is placed on a flat surface, and the edge of the laminated glass 10 is clamped with the thickness gauge to perform the measurement.

[0040] <1-2. Interlayer film> Fig. 3 shows an example of the interlayer film. As shown in Fig. 3, the interlayer film 13 can be configured as three layers, with a soft core layer 136 sandwiched between a pair of outer layers 137, 138 that are harder than the soft core layer. However, the configuration is not limited to this, and the interlayer film 13 may be formed of multiple layers including the core layer 136 and at least one outer layer disposed on the outer glass sheet 11 side.

[0041] The hardness of the core layer 136 is not particularly limited as long as it is softer than the outer layers 137 and 138. The materials constituting the layers 136 to 138 are not particularly limited, but for example, the materials can be selected based on the Young's modulus. Specifically, the Young's modulus of the core layer 136 is preferably 1 to 20 MPa, more preferably 1 to 18 MPa, and particularly preferably 1 to 14 MPa at a frequency of 100 Hz and a temperature of 20 degrees. By setting it in such a range, it is possible to prevent the sound transmission loss (STL) from decreasing in a low frequency range of about 3500 Hz or less. On the other hand, the Young's modulus of the outer layers 137 and 138 is preferably large in order to improve the sound insulation performance in a high frequency range, and can be 560 MPa or more, 600 MPa or more, 650 MPa or more, 700 MPa or more, 750 MPa or more, 880 MPa or more, or 1300 MPa or more at a frequency of 100 Hz and a temperature of 20 degrees. The upper limit of the Young's modulus of the outer layer 522 is not particularly limited, but can be set, for example, from the viewpoint of processability. For example, it is known empirically that if the Young's modulus is 1750 MPa or more, processability, particularly cutting, becomes difficult.

[0042] As a specific material, the outer layers 137, 138 can be made of, for example, polyvinyl butyral resin (PVB). Polyvinyl butyral resin is preferable because it has excellent adhesion to the outer glass plate 11 and excellent penetration resistance. On the other hand, the core layer 136 can be made of, for example, ethylene vinyl acetate resin (EVA) or polyvinyl acetal resin which is softer than the polyvinyl butyral resin constituting the outer layers. By sandwiching a soft core layer, it is possible to greatly improve the sound insulation performance while maintaining the same adhesion and penetration resistance as a single-layer resin interlayer.

[0043] The thickness of the core layer 136 is not particularly limited, but is preferably 0.1 to 2.0 mm, and more preferably 0.1 to 0.6 mm, for example. On the other hand, the thickness of each of the outer layers 137, 138 is not particularly limited, but is preferably 0.1 to 2.0 mm, and more preferably 0.1 to 1.0 mm, for example.

[0044] However, the above-mentioned intermediate film 13 is only one example, and it may be formed as a single layer, or may include various functional layers such as a heat reflecting film, an ultraviolet absorbing film, etc.

[0045] <2.First shielding layer> Next, the first shielding layer 110 will be described. As illustrated in Fig. 1 and Fig. 2, in this embodiment, the first shielding layer 110 is formed along the peripheral portion of the laminated glass 10 on the vehicle interior side surface of the outer glass sheet 11 and on the vehicle interior side of the inner glass sheet 12. Specifically, as shown in Fig. 1, the first shielding layer 110 can be divided into a peripheral region 111 along the peripheral portion of the laminated glass 10 and a protruding region 112 protruding downward in a rectangular shape from the upper side of the laminated glass 10. The peripheral region 111 blocks the incidence of light from the peripheral portion of the windshield. On the other hand, the protruding region 112 prevents the imaging device 2 arranged inside the vehicle from being seen from outside the vehicle.

[0046] However, if the first shielding layer 110 blocks the imaging range of the imaging device 2, the imaging device 2 will not be able to capture the situation outside the vehicle. Therefore, in this embodiment, a rectangular imaging window 113 is provided in the protruding region 112 of the first shielding layer 110 at a position corresponding to the imaging device 2 so that the imaging device 2 can capture the situation outside the vehicle.

[0047] The first shielding layer 110 may be laminated on at least one of the surface of the outer glass sheet 11 facing the vehicle interior side and the surface of the inner glass sheet 12 facing the vehicle exterior side.

[0048] Next, a description will be given of the material of the first shielding layer 110. The material of the first shielding layer 110 may be appropriately selected depending on the embodiment as long as it can block the view from outside the vehicle, and for example, a dark colored ceramic such as black, brown, gray, or dark blue may be used.

[0049] When black ceramics are selected as the material of the first shielding layer 110, for example, black ceramics are laminated on the peripheral portion of the surface of the inner glass sheet 12 on the vehicle interior side by screen printing or the like, and the laminated ceramics are heated together with the outer glass sheet 11 and the inner glass sheet 12. This allows the first shielding layer 110 to be formed on the peripheral portion of the outer glass sheet 11 and the inner glass sheet 12. Also, when printing the black ceramics, a region is provided where the black ceramics is not printed partially. This allows the imaging window 113 to be formed. Note that various materials can be used as the ceramics used for the first shielding layer 110. For example, ceramics having the composition shown in Table 1 below can be used for the first shielding layer 110.

[0050] [Table 1] *1, Main components: copper oxide, chromium oxide, iron oxide and manganese oxide *2, Main ingredients: bismuth borosilicate, zinc borosilicate

[0051] <3.Second shielding layer> The second shielding layer 120 is disposed in an area where light from the HUD device 500 is irradiated. Specifically, as shown in FIG. 4, the second shielding layer 120 is disposed on the surface of the outer glass plate 11 on the vehicle interior side. The HUD device 500 is disposed inside or on the upper surface of the dashboard of the vehicle, and irradiates light toward the second shielding layer 120 to project information about the vehicle on the windshield. The information about the vehicle may be various information such as a speedometer or odometer as defined in Article 46 of the Road Transport Vehicle Safety Standards, as well as a tachometer, a fuel gauge, a water gauge, and a warning light. Note that in FIG. 4, the light from the HUD device 500 is described as being reflected only on the vehicle interior side of the inner glass plate 12, but in reality, it is also reflected on the vehicle exterior side of the inner glass plate 12 and the vehicle interior side of the second shielding layer 120 as described later.

[0052] In particular, the speedometer or odometer stipulated in Article 46 of the Vehicle Safety Standards must be easily visible to the driver. If light from outside the vehicle overlaps with light from the HUD device 500, it may be affected by changes in brightness of the external environment, and the driver may not be able to easily see the image from the HUD device 500. For these reasons, the second shielding layer 120 is required to block visible light from the outside. In addition, by lowering at least one of the ultraviolet transmittance (ISO9050) and the solar transmittance (JISR3106) of the second shielding layer 120, it is possible to suppress deterioration of the flat light source of the HUD device 500 due to ultraviolet rays and heat entering the vehicle from outside through the second shielding layer 120.

[0053] When an image of light irradiated from the HUD device 500 (hereinafter referred to as HUD image) is projected onto an area through which external light passes, the light reflected by projecting the HUD image onto the windshield overlaps with the light from the outside. Therefore, in order to improve the visibility of the HUD image, it is necessary to make the intensity of the irradiated light stronger than the light from the outside. If such strong light is continuously irradiated onto the same area of ​​the windshield, the windshield may discolor. Therefore, it is desirable to project information (HUD image) that is to be displayed in the same area for a long period of time onto the second shielding layer 120. In particular, when projecting the HUD image onto the second shielding layer 120, it is not necessary to take into account the light from the outside, and therefore the illuminance can be reduced. As a result, discoloration of the windshield can be suppressed.

[0054] The second shielding layer 120 can be formed of the same material as the first shielding layer 110. Similarly to the first shielding layer 110, the second shielding layer 120 can be laminated on at least one of the vehicle interior surface of the outer glass sheet 11, the vehicle exterior surface of the inner glass sheet 12, and the vehicle interior surface of the inner glass sheet 12.

[0055] The second shielding layer 120 is positioned in the left-right direction in front of the driver on the windshield. For example, in a right-hand drive vehicle, it is positioned on the right side of the windshield as seen by the driver. The second shielding layer 120 is positioned in the up-down direction in a position lower than, for example, (i) or (ii) below so as not to obstruct the driver's forward field of vision. (i) Below the lower end of the "reduced test area B" specified in JIS R3212(2021)JA.1.1.4b (ii) Below the position 25 mm from the bottom end of the "expanded test area B" specified in JIS R3212(2021)JA.1.1.4b

[0056] That is, the second shielding layer 120 is provided on the lower part of the windshield.

[0057] The shape of the second shielding layer 120 is not particularly limited, but may be any shape that allows easy display of information, and may be a variety of shapes such as a rectangle, a polygon, a circle, an ellipse, or an irregular shape.

[0058] <4. In-vehicle systems> Next, an in-vehicle system 5 including an imaging device 2 and an image processing device 3 will be described with reference to Fig. 5. Fig. 5 illustrates the configuration of the in-vehicle system 5. As shown in Fig. 5, the in-vehicle system 5 according to this embodiment includes the imaging device 2 and an image processing device 3 connected to the imaging device 2.

[0059] The image processing device 3 is a device that processes the captured image acquired by the photographing device 2. The image processing device 3 has, for example, general hardware such as a storage unit 31, a control unit 32, and an input / output unit 33 connected by a bus as a hardware configuration. However, the hardware configuration of the image processing device 3 is not limited to this example, and components can be added, omitted, or added as appropriate to the specific hardware configuration of the image processing device 3 depending on the embodiment.

[0060] The storage unit 31 stores various data and programs (not shown) used in the processes executed by the control unit 32. The storage unit 31 may be realized, for example, by a hard disk or a recording medium such as a USB memory. The various data and programs stored in the storage unit 31 may be acquired from a recording medium such as a CD (Compact Disc) or a DVD (Digital Versatile Disc). Furthermore, the storage unit 31 may be called an auxiliary storage device.

[0061] As described above, the laminated glass 10 is disposed at an angle with respect to the vertical direction and is curved. The image capturing device 2 captures the situation outside the vehicle through the laminated glass 10. Therefore, the captured image captured by the image capturing device 2 is deformed according to the attitude, shape, refractive index, optical defects, etc. of the laminated glass 10. In addition, aberration inherent to the camera lens of the image capturing device 2 is also added. Therefore, the storage unit 31 may store correction data for correcting the image deformed by the aberration of the laminated glass 10 and the camera lens.

[0062] The control unit 32 has one or more processors such as a microprocessor or a CPU (Central Processing Unit), and peripheral circuits (ROM (Read Only Memory), RAM (Random Access Memory), interface circuits, etc.) used for processing by the processor. The ROM, RAM, etc. may be called main memory devices in the sense that they are arranged in an address space handled by the processor in the control unit 32. The control unit 32 functions as an image processing unit 321 by executing various data and programs stored in the memory unit 31.

[0063] The image processing unit 321 processes the captured image acquired by the image capturing device 2. The processing of the captured image can be appropriately selected according to the embodiment. For example, the image processing unit 321 may recognize a subject appearing in the captured image by analyzing the captured image using pattern matching or the like. In this embodiment, since the image capturing device 2 captures the situation in front of the vehicle, the image processing unit 321 may further determine whether or not a living being such as a human is captured in front of the vehicle based on the subject recognition. Then, if a person is captured in front of the vehicle, the image processing unit 321 may output a warning message in a predetermined manner.

[0064] The input / output unit 33 is one or more interfaces for transmitting and receiving data to and from devices external to the image processing device 3.

[0065] Such an image processing device 3 may be a device designed specifically for the service to be provided, or a general-purpose device such as a PC (Personal Computer) or a tablet terminal.

[0066] <5.Features> The windshield configured as above has the following advantages. (1) Since the second shielding layer 120 is arranged so as to overlap with the projection area of ​​the HUD device 500, the light from outside the vehicle can be shielded by the second shielding layer 120, and this makes it possible to prevent the information from the HUD device 500 projected onto the windshield from becoming difficult to see due to the light from outside the vehicle. In other words, the projected information can be easily viewed regardless of the brightness outside the vehicle.

[0067] In particular, when speed indications and the like stipulated in Article 46 of the Vehicle Safety Standards are displayed on an instrument panel as in the past, the speed indications are visually recognized by at least one of a large shift in the line of sight and a change in focal length, which can easily cause eye strain, etc. Therefore, by displaying the speed indications and the like on the windshield using the HUD device 500, eye strain can be reduced.

[0068] The information provided by the light from the outside that passes through the lower part of the windshield is information about a position where the distance to the hood or object is short and the focal length is short. On the other hand, the information provided by the light from the outside that passes through the upper part of the windshield may have a long focal length. Therefore, for example, if the second shielding layer 120 is provided on the upper part of the windshield, the focal length may differ from the information obtained from the light from the outside, which may cause eye strain. Therefore, it is desirable to place the second shielding layer 120 on the lower part of the windshield as in this embodiment.

[0069] (2) Since the surface of the second shielding layer 120 may have unevenness, for example, if the second shielding layer 120 is disposed on the surface of the inner glass plate 12 facing the vehicle interior, the light from the HUD device 500 is hardly able to pass through the second shielding layer 120, and is reflected only by the second shielding layer 120. Therefore, the image of the light from the HUD device 500 may fluctuate. Therefore, in this embodiment, the second shielding layer 120 is disposed on the surface of the outer glass plate 11 facing the vehicle interior (it can be disposed on a surface of the inner glass plate 12 other than the vehicle interior). This can eliminate the influence of the unevenness on the surface of the second shielding layer 120, and can prevent the occurrence of image fluctuating. However, the second shielding layer 120 can also be disposed on the vehicle interior of the inner glass plate.

[0070] (3) The light from the HUD device 500 can be P-polarized light. This allows the driver to see the information projected onto the windshield even when wearing polarized sunglasses.

[0071] Article 46 of the Vehicle Safety Standards stipulates that the speedometer or odometer must be easily visible regardless of whether the driver is wearing polarized sunglasses, so it is desirable to make the information about the vehicle projected on the windshield visible. Therefore, it is desirable for the light from the HUD device 500 to be P-polarized. For example, if an instrument panel is not provided and information such as a speed display is projected only on the windshield by the HUD device 500, the light from the HUD device 500 must be P-polarized.

[0072] <6. Variations> Although one embodiment of the present invention has been described above, the present invention is not limited to the above embodiment, and various modifications are possible without departing from the spirit of the present invention. The following modified examples can be appropriately combined.

[0073] <6-1> As shown in the above embodiment, when the second shielding layer 120 is disposed on the vehicle interior surface of the outer glass plate 11, the light from the HUD device 500 is reflected by the vehicle interior surface of the inner glass plate 12, the vehicle exterior surface of the inner glass plate 12 (the vehicle interior surface of the intermediate film 13), and the vehicle interior surface of the second shielding layer 120. Therefore, these reflected lights may cause deviations in the projected information (occurrence of deviations in the reflected image). Therefore, in order to suppress such deviations, the following measures can be taken.

[0074] (1) As shown in FIG. 6, a transparent reflective film 7 is provided on the surface of the inner glass plate 12 facing the vehicle interior. This reduces the amount of light transmitted through the inner glass plate 12, thereby reducing reflection on the surface of the inner glass plate 12 facing the vehicle interior and the surface of the second shielding layer 120 facing the vehicle interior. As a result, it is possible to suppress the deviation of the reflected image from becoming apparent. In addition, when the light from the HUD device 500 is P-polarized light, the reflectance of P-polarized light is lower than that of S-polarized light, so that sufficient reflectance cannot be obtained on the windshield. Therefore, it is useful to provide the reflective film 7. A known reflective film 7 can be used. In addition, the reflective film 7 may be configured as one layer or multiple layers.

[0075] (2) The difference between the refractive index of the inner glass plate 12 and the refractive index of the intermediate film 13 overlapping with the second shielding layer 120 can be made larger than the difference between the refractive index of the intermediate film 13 overlapping with the second shielding layer 120 and the refractive index of the second shielding layer 120.

[0076] This allows the reflection of light on the vehicle interior surface of the interlayer 13 to be greater than the reflection of light on the vehicle interior surface of the second shielding layer 120. As a result, the reflection of light on the vehicle interior surface of the interlayer 13 is reduced, reducing the deviation of the reflected image.

[0077] (3) When the angle of incidence of light irradiated from the HUD device 500 to the reflective film 7 consisting of at least one layer is larger than the Brewster angle at the interface between the inner glass plate 12 and the atmosphere, the reflectance at the outermost layer of the reflective film 7 can be increased by making the refractive index of the outermost layer of the reflective film 7 in contact with the atmosphere smaller than the refractive index of the inner glass plate 12. Conversely, when the angle of incidence of light irradiated from the HUD device 500 to the reflective film 7 consisting of at least one layer is smaller than the Brewster angle at the interface between the inner glass plate 12 and the atmosphere, the reflectance at the outermost layer of the reflective film 7 can be increased by making the refractive index of the outermost layer of the reflective film 7 in contact with the atmosphere larger than the refractive index of the inner glass plate 12.

[0078] When the reflective film 7 is composed of multiple layers, the reflectance is the sum of the values ​​calculated for each interface by multiplying the transmittance of the light incident on each interface by the reflectance at the interface. If the reflectance at the outermost surface can be increased, less light will be incident on the next interface, so that if the reflectance is the same, less light will be reflected at that interface. Therefore, by increasing the reflectance at the outermost surface, reflection can be strengthened even with the same number of layers, making the reflected image easier to see. The relationship between the angle of incidence to the outermost surface layer and the reflectance at the outermost surface layer when considering the Brewster angle is as shown in Figure 7.

[0079] <6-2> A second HUD device can be used in the windshield, which projects light onto an area through which external light passes. The second HUD device can display information that does not need to be displayed superimposed on objects in the outside world and information that needs to be displayed superimposed on objects in the outside world. Examples of information that does not need to be displayed superimposed on objects in the outside world include information indicating the state of the vehicle, such as a fuel gauge, a water temperature gauge, a turn signal, headlights, door opening and closing, the operation status of ADAS functions, and warning lights, information about the surroundings of the vehicle, such as a rear monitor, a compass, a map, car navigation information, such as the distance to the destination and the estimated time of arrival, and audio information, such as the operation of the audio system and the music being played.

[0080] On the other hand, information that needs to be displayed superimposed on an object in the external scene is, for example, navigation information such as the position of a corner to turn and instructions for changing lanes, and information on objects to be careful of such as pedestrians, bicycles, and motorcycles. To display such information, a HUD device with an AR function (called an AR-HUD device) can be used. As shown in FIG. 8, the AR-HUD device 600 projects an image onto the windshield as described above, and also displays a second image 52 on the windshield as a virtual image. For convenience of explanation, an image based on light from the normal HUD device 500 is referred to as a first image 51, and an image based on light from the AR-HUD device 600 is referred to as a second image 52. The second image 52 is an image for AR (Augmented Reality) display, and is displayed so as to be superimposed on an object included in the external scene. The object is something included in the external scene seen through the laminated glass 10, such as a road, a building, a pedestrian, a vehicle ahead, or a road sign. The second image 52 is a figure or a character such as an arrow as shown in FIG. 9, and in this example, is displayed so as to be superimposed on the road in the outside scene. That is, the first image 51 is displayed so as to be imaged on an object located at a position approximately 3 m or more away from the driver's eyes. The first image 51 can move as seen by the driver, following the object, so as to be fixed relative to the object. Therefore, the relative positional relationship between the driver's eyes, a specific object in the outside scene, and the first image 51 is continuously maintained. Therefore, the shape of the first image 51 may be continuously updated at a predetermined cycle according to the relative position and shape of the specific object. The area of ​​the laminated glass 10 onto which such a first image 51 is projected is an area different from the first shielding layer 110 and the second shielding layer 120 described above.

[0081] In this case, the reflectance of the area where the first image 51 is displayed can be made greater than the reflectance of the area where the second image 52 is displayed. This is because the second image 52 is displayed by being superimposed on transmitted light (external view) from outside the vehicle, and therefore if the reflection of the interior of the vehicle increases, the second image becomes difficult to view. On the other hand, the first image 51 is displayed at a position corresponding to the second shielding layer 120, and therefore is less affected by the reflection.

[0082] <6-3> When the first shielding layer 110 arranged on the periphery of the windshield is arranged on the surface of the inner glass plate 12 facing the vehicle interior, applying an adhesive or the like to the first shielding layer 110 makes it easier to attach the windshield to the vehicle body. From this viewpoint, it is preferable that the first shielding layer 110 is arranged at least on the surface of the inner glass plate 12 facing the vehicle interior. In this case, if the above-mentioned reflective film 7 is applied onto the first shielding layer 110, there is a risk of the adhesive strength with the vehicle body decreasing. Therefore, it is preferable that the reflective film 7 is arranged in a location where the first shielding layer 110 is not provided (or a part of the first shielding layer 110). In particular, if a film with a reflective film having a film substrate and a reflective film 7 formed on this film substrate is used and the film substrate is attached to the first shielding layer 110 by a transparent adhesive layer, there is a concern that the adhesive strength between the windshield and the vehicle body may decrease.

[0083] <6-4> When the first shielding layer 110 and the second shielding layer 120 are disposed on the same surface of either of the glass plates 11 and 12, they can be connected to each other. This allows the first shielding layer 110 and the second shielding layer 120 to be formed by printing in one step.

[0084] <6-5> It is also possible to adjust the glossiness instead of the reflectance. That is, the second shielding layer 120 is formed on the surface of the outer glass plate 11 facing the vehicle interior side or the surface of the inner glass plate 12 facing the vehicle exterior side, and the glossiness of the second shielding layer 120 can be made lower than that of the first shielding layer 110. For example, even if the first shielding layer 110 and the second shielding layer 120 are on the same surface of either of the glass plates 11, 12, the glossiness can be made different as described above.

[0085] If the gloss of the second shielding layer 120 is made lower than that of the first shielding layer 110, the diffuse reflection increases, and by strengthening the reflection of the second shielding layer 120 relatively to the reflection of the first shielding layer 110, double images can be suppressed. In particular, it is preferable to place the second shielding layer 120 on the inside of the inner glass plate 12, since the reflection at the outermost surface of the inside of the windshield is strengthened. Also, when the shielding layers 110 and 120 are formed of ceramics, the gloss can be improved by increasing the firing temperature. That is, the gloss can be controlled by adjusting the temperature distribution during firing. Also, the gloss can be reduced by using a material with a high melting point of ceramics. [Explanation of symbols]

[0086] 10. Laminated Glass 11 Outer glass plate 12 Inner glass plate 13 Interlayer 110 1st shielding layer 120 2nd shielding layer

Claims

1. A windshield on which at least information related to a vehicle is projected by light emitted from a head-up display device disposed inside the vehicle, An outer glass plate; an inner glass plate facing the outer glass plate; an interlayer film that bonds the inner glass sheet and the outer glass sheet; A first shielding layer disposed on a peripheral portion of at least one of the outer glass sheet and the inner glass sheet; A second shielding layer is disposed in an area inside the first shielding layer in at least one of the outer glass sheet and the inner glass sheet, and information about the vehicle is projected onto the second shielding layer. Equipped with a windshield.

2. The upper end of the second shielding layer is JIS R3212(2021)J A. Below the reduced test area B defined in 1.1.4b, or JIS R3212(2021)J A. More than 25 mm below the lower end of the expanded test area B as specified in 1.1.4b The windshield of claim 1 , wherein the windshield is disposed on one of the sides of the vehicle.

3. The first shielding layer is disposed on at least the vehicle interior side surface of the inner glass sheet among the vehicle interior side surface of the outer glass sheet and the vehicle interior side surface of the inner glass sheet, The windshield according to claim 1 , wherein the second shielding layer is disposed at least on a surface of the inner glass sheet other than the surface facing the vehicle interior side.

4. The first shielding layer is disposed on at least the vehicle interior side surface of the inner glass sheet among the vehicle interior side surface of the outer glass sheet and the vehicle interior side surface of the inner glass sheet, The windshield according to claim 1 , wherein the first shielding layer is disposed at least on the same plane as a plane on which the second shielding layer is disposed.

5. The windshield of claim 1 , wherein the first shielding layer and the second shielding layer are connected.

6. The windshield according to claim 1 or 2, wherein the second shielding layer is disposed on an interior side surface of the outer glass sheet.

7. 7. The windshield according to claim 6, wherein a reflective film is disposed on an interior surface of the inner glass sheet.

8. 8. The windshield according to claim 7, wherein a difference between a refractive index of the inner glass sheet and a refractive index of the intermediate film overlapping with the second shielding layer is greater than a difference between a refractive index of the intermediate film overlapping with the second shielding layer and a refractive index of the second shielding layer.

9. The windshield according to claim 7 , wherein the reflective film covers at least a portion of the second shielding layer.

10. 3. The windshield of claim 1, wherein the information relating to the vehicle includes at least one of a speedometer or an odometer.

11. The windshield according to claim 1 or 2, wherein the second shielding layer is disposed on a lower side when the windshield is mounted on a vehicle.

12. 3. The windshield of claim 1 or 2, wherein the light is P-polarized.

13. One or more layers of a reflective film are disposed on the vehicle interior surface of the inner glass plate, 13. The windshield according to claim 12, wherein when an angle of incidence of light emitted from the head-up display device is larger than the Brewster's angle at the inner glass plate, a refractive index of an outermost surface layer of the reflective film is smaller than a refractive index of the inner glass plate.

14. One or more layers of a reflective film are disposed on the vehicle interior surface of the inner glass plate, 13. The windshield according to claim 12, wherein when an incident angle of light emitted from the head-up display device is smaller than the Brewster's angle at the inner glass plate, a refractive index of an outermost surface layer of the reflective film is larger than a refractive index of the inner glass plate.

15. The windshield according to claim 1 or 2, further comprising an illumination area in which light from a second head-up display device is irradiated and projected onto an area in which external light is transmitted and incident and in which the first shielding layer and the second shielding layer are not disposed.

16. The windshield according to claim 15, wherein on the vehicle interior side of the inner glass sheet, the reflectance of the irradiated area is smaller than the reflectance of an area where the first shielding layer and the second shielding layer are provided.

17. The second shielding layer is formed on a surface of the outer glass sheet facing the vehicle interior side or a surface of the inner glass sheet facing the vehicle exterior side, The windshield according to claim 1 or 2, wherein the second shielding layer has a lower gloss than the first shielding layer.

Images