Head-up display device

Abstract

A head-up display device (1) is installed in a mobile body and causes a viewer (35) to view a virtual image based on a reflected image of projection light at a projection unit (31). The projection unit (31) comprises laminated glass (10) provided with: a second glass plate (12) that is arranged on an interior side of the mobile body and is provided with a fourth principal surface (124) exposed to the interior side and a third principal surface (123) on the opposite side of the fourth principal surface; a first glass plate (11) that is arranged on an exterior side of the mobile body and is provided with a first principal surface (111) exposed to the exterior side and a second principal surface (112) on the opposite side of the first principal surface; and an intermediate film (20) for adhering the second principal surface (112) and the third principal surface (123) together. At least one wiper (41, 42) for wiping over the first principal surface in a wiping region is arranged on the first principal surface side (111) of the first glass plate (11). Reflected image formation regions (51, 52, 53), where the reflected image is formed on the first principal surface (111), are located inside the wiping region (71, 72) of the at least one wiper (41, 42), and do not include margins (81, 82) of the wiping regions of any wipers.

Description

[Technical Field]

[0001] The present disclosure relates to a head-up display device. [Background technology]

[0002] The main types of conventional head-up displays (hereafter referred to as HUDs) are wedge-shaped HUDs and polarized HUDs. Wedge-shaped HUDs project images onto laminated glass with a wedge-shaped cross section, superimposing the path of the projected light that is formed through the laminated glass until it reaches the viewer's point of view, thereby reducing the blurring of the image received by the viewer, known as "ghosts" or "double images."

[0003] On the other hand, polarized HUDs have the characteristic of suppressing the occurrence of double images by irradiating S-polarized or P-polarized light from a direction that satisfies the Brewster angle onto laminated glass equipped with an intermediate film consisting of an optically rotatory film that shifts the phase of incident light sandwiched between resin films such as polyvinyl butyral (hereinafter referred to as PVB).

[0004] Patent Document 1 describes a laminated glass in which two glass plates are bonded together with an interlayer such as PVB, and a polarization rotator film is bonded to the bonding surface. When this laminated glass is irradiated with S-polarized or P-polarized light, a person viewing the vehicle can recognize a HUD image with reduced double images. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Application Publication No. 6-040271 Summary of the Invention [Problem to be solved by the invention]

[0006] A polarized HUD (hereafter referred to as a P-HUD) that uses P-polarized light is characterized by the fact that when P-polarized light is irradiated onto the surface of laminated glass that contacts the interior of the vehicle at an angle that forms the Brewster angle, the P-polarized light refracts and travels within the laminated glass with almost no reflection, is converted into S-polarized light by an optical rotatory film, is reflected on the surface of the laminated glass that contacts the outside world, is converted back into P-polarized light by an optical rotatory film, is refracted outside the laminated glass with almost no reflection on the surface of the laminated glass that contacts the interior of the vehicle, and travels outside the laminated glass until it enters the viewer's eyes. Unlike polarized HUDs that use S-polarized light, the light that enters the viewer's eyes is not blocked by polarized sunglasses, so performance is not affected by whether or not sunglasses are used.

[0007] However, if water droplets or a water film that disturbs the surface remain on the laminated glass during rainy weather, some of the S-polarized light converted by the optically active film will be refracted by the water droplets or water film remaining on the exterior surface of the laminated glass and travel toward the exterior of the vehicle, or reflected and travel in an unexpected direction toward the interior of the vehicle. As a result, the image perceived by the viewer will be distorted. This phenomenon is particularly noticeable around the periphery of the wiper movement range.

[0008] In addition, with wedge-type HUDs, the reflected image formed on the exterior surface of the vehicle is distorted due to the effects of water droplets or water films remaining on the exterior surface of the laminated glass. As with polarized HUDs, this phenomenon is particularly noticeable around the periphery of the wiper movement range.

[0009] In light of the above, an object of the present invention is to provide a HUD device that enables a viewer to see a clear image even in rainy weather. [Means for solving the problem]

[0010] A head-up display device according to the present disclosure is mounted on a moving body and allows a viewer to view a virtual image based on a reflected image of projection light at a projection unit, the head-up display device comprising: the projection unit comprises a laminated glass including: a second glass plate disposed on an indoor side of the movable body, the second glass plate having a fourth main surface exposed to the indoor side and a third main surface opposite to the fourth main surface; a first glass plate disposed on an outdoor side of the movable body, the first glass plate having a first main surface exposed to the outdoor side and a second main surface opposite to the first main surface; and an interlayer film bonding the second main surface and the third main surface together; at least one wiper is disposed on a first main surface side of the first glass plate, the wiper sliding on the first main surface in a sliding region; The reflection image forming area where a reflection image is formed on the first main surface is located within the sliding area of ​​the at least one wiper and does not include the peripheral portion of the sliding area of ​​any wiper.

[0011] The head-up display device of the present disclosure includes a wiper that slides in a sliding area on a first main surface that corresponds to the exterior side of a vehicle. In rainy weather, water droplets or a water film tend to remain on the periphery of the sliding area. In the head-up display device of the present disclosure, the reflection image forming area where the reflection image is formed on the first principal surface does not include the peripheral edge of the sliding area. In other words, the reflection image forming area does not overlap with the peripheral edge of the sliding area where water droplets or water films are likely to remain. This reduces the influence of refraction or reflection of the projection light that forms the reflection image by water droplets or water films. This results in a HUD device that allows the viewer to clearly see the image even in rainy weather.

[0012] The head-up display device of the present disclosure includes, as the wiper, a first wiper that slides on the first main surface in a first sliding region, It is preferable that the reflected image forming area does not include the peripheral edge of the first sliding area.

[0013] The head-up display device of the present disclosure further includes, as the wiper, a second wiper that slides on the first main surface in a second sliding region, It is preferable that the reflected image forming area does not include the peripheral edge of the second sliding area. In the head-up display device of the present disclosure, the first sliding area and the second sliding area may partially overlap each other.

[0014] When the head-up display device of the present disclosure is equipped with a second wiper, water droplets and a water film are likely to remain on the periphery of the second sliding area. By making the reflected image forming area not overlap with the periphery of the second sliding area, a HUD device can be obtained that allows the viewer to see a better image even in rainy weather.

[0015] In the head-up display device of the present disclosure, the first wiper is arranged on the driver's seat side and the second wiper is arranged on the passenger's seat side, and both the first wiper and the second wiper have a drive shaft on the driver's seat side of the moving body, and the length of the first wiper may be equal to or greater than the length of the second wiper.

[0016] In this embodiment, the position of the peripheral edge portion located below the second sliding region located on the passenger seat side can be raised near the center of the laminated glass. Usually, the lower side near the center of the laminated glass is the position where it is most desirable to display an image, so it is possible to prevent the peripheral edge of the second sliding region from overlapping this portion.

[0017] In the head-up display device of the present disclosure, it is preferable that the first main surface further includes a water-repellent film. The thickness of the water-repellent film is preferably 200 nm or less. If the first main surface is provided with a water-repellent film, water droplets or a water film are less likely to remain on the first main surface, thereby further improving the visibility of images in rainy weather.

[0018] In the head-up display device of the present disclosure, the laminated glass includes an optically active film that changes the vibration direction of incident projection light, the intermediate film bonds the second principal surface to the optically rotatory film and the optically rotatory film to the third principal surface, respectively; the projection light projected onto the fourth principal surface is P-polarized light, It is preferable that the viewer observes a virtual image based on a reflected image reflected from the first main surface toward the room as S-polarized light. The head-up display device having the above configuration is a P-HUD type HUD device (P-HUD device). In P-HUD devices, the influence of water droplets and water films remaining on the outer surface of the laminated glass around the periphery of the wiper sliding range is significant, so the HUD device of the present disclosure, which can reduce this influence, is more effectively utilized.

[0019] In the head-up display device of the present disclosure, it is preferable that the projection light projected onto the fourth main surface is incident on the fourth main surface at an incident angle of 50 to 65°. When the projection light projected onto the fourth principal surface is incident at an angle of incidence of 50 to 65° relative to the fourth principal surface, the angle of incidence is close to the Brewster's angle, so that the proportion of P-polarized light reflected by the fourth principal surface is small and most of the P-polarized light travels inside the laminated glass, thereby increasing the brightness of the virtual image and preventing the projection light reflected by the fourth principal surface from overlapping with the projection light emitted from the fourth principal surface after reflection from the first principal surface.

[0020] In the head-up display device of the present disclosure, it is preferable that a reflected image is formed only on the first main surface.

[0021] In the head-up display device of the present disclosure, it is preferable that the reflected image formation area is 150 mm or more in the vertical direction within the first main surface.

[0022] In the head-up display device of the present disclosure, it is preferable that the reflected image formation area is 150 mm or more in the lateral direction within the first main surface. [Effects of the Invention]

[0023] The present invention can provide a HUD device that allows the viewer to see a clear image even in rainy weather. [Brief explanation of the drawings]

[0024] [Figure 1] FIG. 1 is a schematic diagram showing an outline of a HUD device according to an embodiment of the present invention and a light path in the device. [Figure 2] FIG. 2 is a schematic diagram showing a first wiper, a first sliding region, and a first peripheral edge portion on a first main surface. [Figure 3] FIG. 3 is a schematic diagram showing a second wiper, a second sliding region, and a second peripheral edge portion on the first main surface. [Figure 4] FIG. 4 is a schematic diagram showing examples of a first wiper, a first sliding area and a first peripheral portion, a second wiper, a second sliding area and a second peripheral portion, and a reflected image forming area on the first main surface of a HUD device having two wipers. [Figure 5] FIG. 5 is a schematic diagram showing another example of a first wiper, a first sliding area and a first peripheral portion, a second wiper, a second sliding area and a second peripheral portion, and a reflected image forming area on the first main surface of a HUD device having two wipers. [Figure 6] FIG. 6 is a schematic diagram showing an example of a first wiper, a first sliding region, a first peripheral portion, and a reflected image forming region on a first main surface of a HUD device having one wiper. [Figure 7] FIG. 7 is a diagram showing the positions of the reflection image forming areas set in the examples and comparative examples. [Figure 8] FIG. 8 is a photograph showing a virtual image visually recognized in Example 1. [Figure 9] FIG. 9 is a photograph showing a virtual image visually recognized in Example 2. [Figure 10] FIG. 10 is a photograph showing a virtual image visually recognized in Example 3. [Figure 11] FIG. 11 is a photograph showing a virtual image visually recognized in Example 4. [Figure 12] FIG. 12 is a photograph showing a virtual image visually recognized in Comparative Example 1. [Figure 13]FIG. 13 is a photograph showing a virtual image visually recognized in Comparative Example 2. DETAILED DESCRIPTION OF THE INVENTION

[0025] A head-up display device (HUD device) according to an embodiment of the present invention will be described with reference to the drawings. The following description will be given of a case where the head-up display device is a P-HUD device.

[0026] Examples of mobile bodies include vehicles (passenger cars, trucks, buses, trains, etc.), steamships, ships, airplanes, etc. Among these, vehicles are preferred. The moving body is provided with laminated glass that serves as a projection unit. The laminated glass comprises a second glass plate arranged on the indoor side of the mobile body and having a fourth main surface exposed to the indoor side and a third main surface opposite the fourth main surface, a first glass plate arranged on the outdoor side of the mobile body and having a first main surface exposed to the outdoor side and a second main surface opposite the first main surface, and an interlayer film bonding the second main surface and the third main surface together.

[0027] In the case of a P-HUD device, the laminated glass is equipped with an optically rotatory film that changes the vibration direction of the incident projection light, and the intermediate film bonds the second principal surface to the optically rotatory film and the optically rotatory film to the third principal surface, respectively. The projection light projected onto the fourth principal surface is P-polarized light, and the viewer observes a virtual image based on the reflected image reflected from the first principal surface into the room as S-polarized light.

[0028] In laminated glass, a first glass plate and a second glass plate are bonded together via an interlayer film to form an integrated structure. The interlayer film is not particularly limited as long as it adheres to the glass plate and the optically active film. For example, the first glass plate and the second glass plate are laminated together by heating them at a temperature at which the polymer constituting the interlayer film softens. Examples of polymers that can be used include polyvinyl butyral (PVB), ethylene vinyl acetate (EVA), acrylic resin (PMMA), urethane resin, polyethylene terephthalate (PET), and cycloolefin polymer (COP). Adhesives or pressure-sensitive adhesives that harden with moisture or ultraviolet light can also be used. The interlayer film may be composed of multiple resin layers.

[0029] As the glass material for the laminated glass, flat glass plates processed into a curved shape can be suitably used. As the material for the glass plates, soda-lime silicate glass as specified in ISO 16293-1, as well as glass plates with known glass compositions such as aluminosilicate glass, borosilicate glass, and alkali-free glass can be used. The thickness of each of the first and second glass plates may be, for example, 0.4 mm to 3 mm. The distance between the first and second glass plates may be 0.01 mm to 2.5 mm.

[0030] Optical rotatory film shifts the phase of the projection light incident on the projection surface or changes the vibration direction of the projection light. For example, if the optical rotatory film is a half-wave film, it rotates the vibration direction of the incident projection light by 2dθ, where dθ is the angle between the vibration direction of the projection light incident on the projection surface and the optical axis. The optically active film may also include a layer or film that does not have a substrate, such as a layer having an optical axis in the projection area formed by coating, laminating, attaching, adhering, pressing, transferring, or the like. The optically active film may be a half-wave film or a quarter-wave film, or two quarter-wave films stacked together.

[0031] The optically active film is disposed between the second main surface of the first glass plate and the third main surface of the second glass plate. The second main surface of the first glass plate and the optically rotatory film are bonded together by an interlayer, and the third main surface of the second glass plate and the optically rotatory film are bonded together by an interlayer.

[0032] FIG. 1 is a schematic diagram showing an outline of a HUD device according to an embodiment of the present invention and a light path in the device. In FIG. 1, the optical path of the projection light is shown by a solid line. In the HUD device 1, the projection unit is a laminated glass 10 for a vehicle. The laminated glass 10 for a vehicle has a second glass plate 12 disposed on the interior side of the vehicle and a first glass plate 11 disposed on the exterior side of the vehicle. The second glass plate 12 has a fourth main surface 124 exposed to the interior side and a third main surface 123 opposite to the fourth main surface 124 . The first glass plate 11 has a first main surface 111 exposed to the outside and a second main surface 112 opposite to the first main surface 111 . An optically active film 100 is disposed between the first glass plate 11 and the second glass plate 12 . In addition, the first glass plate 11 and the second glass plate 12 are joined via an intermediate film 20, the second main surface 112 of the first glass plate 11 and the optically rotatory film 100 are bonded by the intermediate film 20, and the third main surface 123 of the second glass plate 12 and the optically rotatory film 100 are bonded by the intermediate film 20.

[0033] Furthermore, the optically rotatory film may be disposed over the entire surface or may be disposed partially, and it is preferable that the total area of ​​the surfaces of the optically rotatory film facing the second principal surface and the third principal surface is equal to or less than the area of ​​the second principal surface and the third principal surface.

[0034] In the HUD device 1, projection light 60 is emitted from the video unit 31. Here, the plane including three points, namely, light emitting point 32 of image section 31, reflection point 33 where projection light 60 is reflected by first main surface 111, and viewpoint 34 of viewer 35, is the plane of incidence. In a vehicle, the video unit 31 is preferably placed on the dashboard or the like of the vehicle.

[0035] The projection light projected from the image section 31 onto the fourth principal surface 124 is P-polarized light whose vibration direction is parallel to the plane of incidence. When the projected light is P-polarized, it can also be used in sunglasses mode, where the virtual image is observed through polarized sunglasses. Also, although polarized sunglasses 36 are used in Figure 1, the virtual image can of course also be observed with the naked eye. First, the projection light 60 emitted from the image unit 31 is irradiated onto the fourth principal surface 124. The angle at this time is preferably Brewster's angle. Generally, P-polarized light incident at the Brewster's angle does not undergo reflection, so it is possible to suppress reflection at the fourth principal surface 124, which causes double images. In the HUD device 1, it is preferable that the projection light projected onto the fourth main surface is incident at an incident angle of 50 to 65°.

[0036] Next, the projection light 60 that has traveled through the projection unit is incident on the optically active film 100, whereupon the vibration direction is changed. In the HUD device 1, it is sufficient that reflection occurs on any surface other than the fourth principal surface, and therefore it is possible to use a half-wave film (a half-wave film), a quarter-wave film, or the like as the optical rotatory film 100. Two quarter-wave films may also be used stacked on top of each other. The vibration direction of light after passing through the optical rotatory film 100 varies depending on the type of optical rotatory film and the direction of the optical axis. For example, when a half-wave film is used as the optical rotatory film, the vibration direction of the projection light after passing through the optical rotatory film 100 is rotated by 2dθ, where dθ is the angle formed between the vibration direction of the projection light incident on the projection surface and the optical axis of the optical rotatory film.

[0037] Examples of optically active films that can be used include retardation elements obtained by uniaxially or biaxially stretching plastic films such as polycarbonate, polyarylate, polyethersulfone, cycloolefin polymer, triacetyl cellulose, polyethylene terephthalate (PET), and polyethylene naphthalate (PEN), and optically active elements obtained by aligning a liquid crystal polymer in a specific direction and fixing the orientation state. The former retardation element, which is a uniaxially or biaxially stretched plastic film, can be produced by, for example, a solvent casting method in which a polymer resin is dissolved in a solvent, coated on a smooth surface such as a stainless steel belt or polyethylene terephthalate (PET), and the film is wound up after the solvent is evaporated, or a melt extrusion method in which a polymer resin is placed in an extruder, heated and melted, extruded through a slit (T-die), cooled, and then wound up. A stretching machine is generally used for stretching, and an optically active film can be obtained that is stretched longitudinally, transversely, diagonally, etc. As the latter optically active element, for example, a liquid crystal polymer can be applied to a transparent substrate such as a transparent plastic film of oriented polyethylene terephthalate (PET) or triacetyl cellulose (TAC), and the liquid crystal orientation can be fixed by heat treatment, ultraviolet irradiation, or the like. Examples of the liquid crystal polymer are not particularly limited as long as they exhibit liquid crystallinity such as nematic liquid crystal, twisted nematic liquid crystal, discotic liquid crystal, or cholesteric liquid crystal when oriented in a specific direction. For example, those that exhibit twisted nematic orientation in the liquid crystal state and become glassy below the liquid crystal transition point can be used, including main-chain liquid crystal polymers such as optically active polyesters, polyamides, polycarbonates, and polyesterimides, and side-chain liquid crystal polymers such as optically active polyacrylates, polymethacrylates, polymerotes, and polysiloxanes. Other examples include polymer compositions in which other low-molecular-weight or high-molecular-weight optically active compounds are added to these main-chain or side-chain polymers that are not optically active.

[0038] Next, when the projection light reaches first main surface 111, it is reflected to form a reflected image. At this time, S-polarized light is reflected as the reflected light, and the other light that is not reflected passes through first main surface 111 and is emitted to the outside of the room. Next, the reflected image formed on the first principal surface 111 passes through the optically active film 100 again and becomes P-polarized light. The viewer 35 visually recognizes a virtual image 621 on an extension of the optical path 62 based on the reflected image on the first principal surface 111. Since this virtual image 621 is made of P-polarized light, the viewer 35 can view the virtual image 621 even through polarized sunglasses 36. In this case, the viewer observes a virtual image based on a reflected image formed on the exterior side (ie, the first main surface) of the first glass plate.

[0039] Furthermore, if there is a reflective layer that reflects light before it reaches first principal surface 111, reflection occurs at that layer. In that case, if the unreflected light reaches first principal surface 111 and is further reflected, this reflection may cause a double image. Therefore, if reflection occurs before it reaches first principal surface 111, it is preferable to change the vibration direction of the light so that it becomes P-polarized light again before it reaches first principal surface 111. In this case, it is preferable that the viewer observes a virtual image based on a reflected image formed on a surface other than the interior surface of the second glass plate. The "reflected image formed on a surface other than the interior surface of the second glass plate" also includes the "reflected image formed on the exterior surface of the first glass plate."

[0040] In the HUD device according to the embodiment of the present invention, at least one wiper is arranged to slide on the first main surface in the sliding region. The reflected image forming area where a reflected image is formed on the first main surface is located within the sliding area of ​​at least one wiper, and does not include the peripheral edge of any sliding area of ​​the wiper. The number of wipers arranged on the HUD device needs to be at least one, but in the case of wipers for vehicles, there are often one or two. First, the case where the number of wipers is two will be described.

[0041] When there are two wipers, the two wipers are called the first wiper and the second wiper, respectively. The first wiper is disposed on the driver's side, and the second wiper is disposed on the passenger's side. The area where the first wiper slides on the first main surface is called the first sliding area, and the peripheral portion of the first sliding area is called the first peripheral portion. The region where the second wiper slides on the first main surface is referred to as a second sliding region, and the peripheral portion of the second sliding region is referred to as a second peripheral portion.

[0042] The HUD device of this embodiment includes a first wiper that slides on the first main surface in a first sliding region, and a reflection image forming region where a reflection image is formed on the first main surface does not include the peripheral edge of the first sliding region. The wiper also includes a second wiper that slides on the first main surface in a second sliding region, and a reflection image forming region where a reflection image is formed on the first main surface does not include the peripheral edge of the second sliding region.

[0043] 2 is a schematic diagram showing the first wiper, the first sliding region, and the first peripheral edge portion on the first main surface, as viewed from the interior side (the fourth surface side of the laminated glass). In addition, in each drawing in this specification showing wipers, the wiper trajectory is expressed by showing the wipers in multiple locations in the same drawing. For example, in Figure 2, the first wiper is shown in four locations, but the number of first wipers provided in this HUD device is one.

[0044] 2 shows the first wiper 41, and the area where the first wiper 41 slides on the first main surface 111 is shown as a first sliding area 71. The first sliding area 71 is an area where water droplets adhering to the first main surface 111 are wiped off by the first wiper 41. The periphery of the first sliding area 71 is shown by a thick line as a first peripheral edge portion 81. The first peripheral edge portion 81 is a portion where the wiped-off water droplets collect when the water droplets adhering to the first main surface 111 are wiped off by the first wiper 41.

[0045] 3 is a schematic diagram showing the second wiper, the second sliding region, and the second peripheral edge portion on the first main surface, as viewed from the interior side (the fourth surface side of the laminated glass). 3 shows the second wiper 42, and the area where the second wiper 42 slides on the first main surface 111 is shown as a second sliding area 72. The second sliding area 72 is an area where water droplets adhering to the first main surface 111 are wiped away by the second wiper 42. The periphery of the second sliding area 72 is shown by a thick line as a second peripheral edge portion 82. The second peripheral edge portion 82 is a portion where the wiped-off water droplets collect when the water droplets adhering to the first main surface 111 are wiped away by the second wiper 42.

[0046] FIG. 4 is a schematic diagram showing examples of a first wiper, a first sliding area and a first peripheral portion, a second wiper, a second sliding area and a second peripheral portion, and a reflected image forming area on the first main surface of a HUD device having two wipers. FIG. 4 shows an overall view of the HUD device 1. The HUD device 1 includes the first wiper 41 and the second wiper 42 described in Figures 2 and 3. Also, Figure 4 shows the first sliding area 71, the first peripheral edge portion 81, and the second sliding area 72, and the second peripheral edge portion 82. The first sliding region 71 and the second sliding region 72 partially overlap each other. The combined region of the first sliding region 71 and the second sliding region 72 is defined as the total sliding region 70. A portion of the first peripheral edge portion 81 is included in the second sliding region 72. Furthermore, a portion of the second peripheral edge portion 82 is included in the first sliding region 71. The combined portion of the first peripheral edge portion 81 and the second peripheral edge portion 82 is defined as the entire peripheral edge portion 80. The entire peripheral edge portion 80 includes the first peripheral edge portion 81 included in the second sliding region 72, and the second peripheral edge portion 82 included in the first sliding region 71. The entire peripheral edge portion 80 is a portion where the wiped water droplets collect when the first wiper 41 and the second wiper 42 move together to wipe away the water droplets adhering to the first main surface 111 .

[0047] In the HUD device according to an embodiment of the present invention, the reflected image forming area in which a reflected image is formed on the first principal surface is located within the sliding area of ​​at least one wiper, and does not include the peripheral portion of any of the sliding areas of the wipers. Specific embodiments of the reflection image forming region include the following. (1) An embodiment in which the entire reflected image forming area is located inside the first sliding area and outside the second sliding area. (2) An embodiment in which the entire reflected image forming area is located inside the second sliding area and outside the first sliding area. (3) An embodiment in which the entire reflected image forming area is located inside the first sliding area and also inside the second sliding area, i.e., an embodiment in which the entire reflected image forming area is located inside the area where the first sliding area and the second sliding area overlap.

[0048] The reflected image forming area does not overlap any of the lines that make up the overall perimeter 80 shown in FIG. FIG. 4 shows a reflection image forming area 51, a reflection image forming area 52, and a reflection image forming area 53 as examples of the reflection image forming area.

[0049] The reflection image forming area 51 is a reflection image forming area that is located entirely inside the first sliding area 71, which is the sliding area of ​​the first wiper 41, and is located entirely outside the second sliding area 72, which is the sliding area of ​​the second wiper 42. The reflection image forming area 52 is a reflection image forming area that is located entirely inside the second sliding area 72, which is the sliding area of ​​the second wiper 42, and entirely outside the first sliding area 71, which is the sliding area of ​​the first wiper 41. The reflected image forming area 53 is a reflected image forming area that is located entirely inside the first sliding area 71, which is the sliding area of ​​the first wiper 41, and is also located entirely inside the second sliding area 72, which is the sliding area of ​​the second wiper 42.

[0050] None of the reflected image forming area 51 , the reflected image forming area 52 , and the reflected image forming area 53 overlaps with any of the lines that make up the entire periphery 80 . The entire peripheral edge portion 80 is a portion where the wiped water droplets collect when the first wiper 41 and the second wiper 42 move together to wipe away the water droplets adhering to the first main surface 111 . That is, in the HUD device according to the embodiment of the present invention, the reflected image forming area where the reflected image is formed on the first main surface does not overlap with the area where water droplets collect. Therefore, the image perceived by the viewer is not affected by water droplets that accumulate on the first main surface of the laminated glass in rainy weather, and the viewer can see a clear image even in rainy weather.

[0051] When the head-up display device of the present disclosure is needed, it is preferable that the reflected image forming areas 51 to 53 are 150 mm or more in the vertical direction within the first main surface. It is also preferable that the width in the lateral direction within the first main surface is 150 mm or more.

[0052] The HUD device according to the embodiment of the present invention preferably further comprises a water-repellent film on the first main surface, which makes it difficult for raindrops to spread over the first main surface, making it easier for the windshield wiper to wipe away the raindrops, and making it difficult for the raindrops to remain on the first main surface. The thickness of the water-repellent film is preferably 200 nm or less. If the water-repellent film is provided with a thickness of more than 200 nm, its effect is unlikely to improve, and if the film is too thick, problems such as cracking of the film, perspective distortion due to uneven film thickness, increased haze, and noticeable scratches due to external contact may occur.

[0053] In the HUD device according to an embodiment of the present invention, the first wiper is positioned on the driver's seat side and the second wiper is positioned on the passenger's seat side, and it is preferable that both the first wiper and the second wiper have a drive shaft on the driver's seat side of the moving body, and that the length of the first wiper is equal to or greater than the length of the second wiper. This aspect will be described below.

[0054] FIG. 5 is a schematic diagram showing another example of a first wiper, a first sliding area and a first peripheral portion, a second wiper, a second sliding area and a second peripheral portion, and a reflected image forming area on the first main surface of a HUD device having two wipers. In the HUD device 2 shown in FIG. 5, the drive shaft 91 of the first wiper 41 and the drive shaft 92 of the second wiper 42 are both located on the driver's seat side of the vehicle. In the configuration shown in Fig. 5, the length of the second wiper is shorter than that in the configuration shown in Fig. 4. The lengths of the first wiper and the second wiper are the lengths of the wiper blades of the respective wipers (the lengths of the rubber parts that actually wipe away water droplets). If the length of the second wiper is short, the position of the peripheral edge 82b (the portion of the peripheral edge 82 indicated by the thick line in FIG. 5) located below the second sliding region 72 can be raised near the center of the laminated glass. This allows the first sliding region 71 below the peripheral edge 82b to be widely used as a reflected image forming region. This area, shown as the reflected image forming area 53', is usually located on the lower side near the center of the laminated glass, where it is most desirable to display an image. Therefore, a configuration in which the position of the peripheral edge 82b can be raised is preferred.

[0055] Furthermore, in the HUD device according to the embodiment of the present invention, it is preferable that the first wiper is arranged on the driver's seat side and the second wiper is arranged on the passenger's seat side, and that the end of the wiper blade of the second wiper on the drive shaft side is located in a region extending from the passenger's seat side end of the laminated glass to 2 / 5 of the way towards the driver's seat. This aspect will be described below.

[0056] The distance from the passenger seat side edge to the driver seat side edge of the laminated glass is defined as the whole (proportion 1). Then, the area from the passenger seat side edge toward the driver seat is defined as 2 / 5 of the whole (proportion 1). The end of the wiper blade of the second wiper on the drive shaft side corresponds to the right end when the wiper blade is in the lowest position. If this position is within the 2 / 5 region, the position of the peripheral edge 82b (the portion of the peripheral edge 82 indicated by the thick line in Figure 5) located below the second sliding region 72 can be raised near the center of the laminated glass.

[0057] It is more preferable that the end of the wiper blade of the second wiper on the drive shaft side is located in a region extending from the passenger seat side end of the laminated glass to one-third of the way toward the driver seat side.

[0058] Next, a case where there is one wiper will be described. When there is one wiper, only the first wiper that mainly slides on the driver's seat side is provided, and the specifications of this first wiper are generally adjusted so that it slides over a wider range than the first wiper when there are two wipers.

[0059] 6 is a schematic diagram showing an example of a first wiper, a first sliding region, a first peripheral portion, and a reflected image forming region on the first main surface of a HUD device having one wiper, as viewed from the interior side (the fourth surface side of the laminated glass). FIG. 6 shows an overall view of the HUD device 3. The HUD device 3 includes a first wiper 141 . 6, the area where the first wiper 141 slides on the first main surface 111 is shown as a first sliding area 171. The first sliding area 171 is an area where water droplets adhering to the first main surface 111 are wiped off by the first wiper 141. The periphery of the first sliding area 171 is shown by a thick line as a first peripheral edge 181. The first peripheral edge 181 is a portion where the wiped-off water droplets collect when the water droplets adhering to the first main surface 111 are wiped off by the first wiper 141. When the number of wipers is one, the first sliding area is the same as the entire sliding area, and the first peripheral portion is the same as the entire peripheral portion.

[0060] The reflected image forming area does not overlap any of the lines that make up the first peripheral portion 181 shown in FIG. FIG. 6 shows a reflection image forming area 151 as an example of the reflection image forming area.

[0061] The reflected image forming area 151 is a reflected image forming area located within the first sliding area 171 of the first wiper 141 .

[0062] None of the reflected image forming regions 151 overlaps with any of the lines that make up the first peripheral portion 181 . The first peripheral edge portion 181 is a portion where the wiped water droplets collect when the first wiper 141 moves together to wipe away the water droplets adhering to the first main surface 111. That is, in the HUD device according to the embodiment of the present invention, the reflected image forming area where the reflected image is formed on the first main surface does not overlap with the area where water droplets collect.

[0063] Up to this point, the case where the head-up display device of the present disclosure is a P-HUD device has been described, but the head-up display device of the present disclosure may also be a wedge-type HUD device. In a wedge-shaped HUD device, the projection unit has a wedge angle profile with a gradually varying thickness, so that the optical path of the projection light is adjusted so that, as seen by the viewer, the virtual image based on the first reflected image reflected from the fourth principal surface coincides with the virtual image based on the second reflected image reflected from the first principal surface.

[0064] The second reflected image reflected from the first principal surface is affected by water droplets or water films remaining on the exterior surface of the laminated glass. However, the reflection image formation area where the second reflected image is formed is within at least one wiper sliding area and does not include the peripheral area of ​​any wiper sliding area. This reduces the influence of the projected light that forms the reflected image being refracted or reflected by water droplets or water films. This results in a HUD device that allows the viewer to clearly recognize the image even in rainy weather.

[0065] In the case of laminated glass that serves as the projection part of a wedge-shaped HUD device, a thickness gradient is used for the interlayer film or glass plate. By using an interlayer or glass plate with a gradient in thickness, the projection section can have a wedge angle profile in the area of ​​the first or second reflected image, with a gradually varying thickness. [Example]

[0066] An experiment was conducted to compare the visibility of the virtual image by changing the positional relationship between the reflected image forming area on the first main surface and the wiper sliding area. The experiment was conducted using a P-HUD device. FIG. 7 is a diagram showing the positions of the reflection image forming areas set in the examples and comparative examples. As an example, reflected image forming areas 51 and 53 were set. These reflected image forming areas are areas that are within the sliding area of ​​at least one wiper, as described with reference to FIG. 4, and do not include the periphery of each sliding area of ​​any wiper. As a comparative example, a reflected image forming area 54 was set. The reflected image forming area 54 is an area including the second peripheral portion 82 of the second wiper 42 .

[0067] A reflection image was formed in each reflection image forming area set as an example and a comparative example. To simulate a rainy condition, water was continuously sprayed onto the first principal surface, and the first wiper and the second wiper were operated, and the visibility of the virtual image was observed.

[0068] Furthermore, to simulate the formation of a reflected image outside the wiper sliding area, water was continuously sprayed onto the first principal surface, and a reflected image was formed in the same area as the reflected image formation area 51 without operating the wiper, and the visibility of the virtual image was observed. This example corresponds to a comparative example.

[0069] In the examples, a test was conducted to observe the visibility of the virtual image in the same manner for both the case where the first main surface was provided with a water-repellent film and the case where the first main surface was not provided with a water-repellent film. The thickness of the water-repellent film was set to 8 nm. For the comparative example, only the test was carried out in the case where the first main surface was not provided with a water-repellent film.

[0070] The test overview and the diagrams showing the test results are summarized in Table 1 below. FIG. 8 is a photograph showing a virtual image visually recognized in Example 1. FIG. 9 is a photograph showing a virtual image visually recognized in Example 2. FIG. 10 is a photograph showing a virtual image visually recognized in Example 3. FIG. 11 is a photograph showing a virtual image visually recognized in Example 4. FIG. 12 is a photograph showing a virtual image visually recognized in Comparative Example 1. FIG. 13 is a photograph showing a virtual image visually recognized in Comparative Example 2.

[0071] [Table 1]

[0072] The visibility of virtual images was evaluated as follows: ◯: The visibility of the virtual image was good, and no distortion occurred in the virtual image. △: The virtual image was visible and was not distorted. ×: Distortion occurred in a part (periphery) or the whole of the virtual image.

[0073] No distortion occurred in the virtual image in Examples 1 to 4. Furthermore, in Examples 2 and 4 in which the first main surface was provided with a water-repellent film, the visibility of the virtual image was particularly good. In Comparative Example 1, since the reflected image formation region includes the second peripheral portion, distortion occurs in the virtual image at the second peripheral portion. Furthermore, Comparative Example 2 simulated an area where water droplets were not wiped off by the wiper, and distortion occurred in the virtual image in that area. [Explanation of symbols]

[0074] 1, 2, 3 HUD device 10. Laminated glass for vehicles 11 First glass plate 12 Second glass plate 20 Interlayer 31 Video Department 32 Luminous point 33 reflection point 34 Viewpoints 35 Viewer 36 Polarized sunglasses 41, 141 First wiper 42 Second wiper 51, 151 Reflection image forming area (reflection image forming area located inside the first sliding area) 52 Reflection image forming area (reflection image forming area located inside the second sliding area) 53 Reflection image forming area (reflection image forming area located inside the first sliding area and the second sliding area) 53' Reflection image forming area (first sliding area below the peripheral portion 82b) 54 Reflection image forming area (reflection image forming area including peripheral area) 60 projection light 62 Optical path based on the reflected image formed on the first principal surface 70 Total sliding area 71, 171 First sliding region 72 Second sliding region 80 All around 81, 181 First peripheral area 82 Second Periphery 82b: a peripheral portion located below the second sliding region 91 First wiper drive shaft 92 Second wiper drive shaft 100 Optical Rotatory Film 111 First principal surface 112 Second principal surface 123 Third principal surface 124 Fourth principal plane 621 Virtual Image

Claims

1. A head-up display device that is mounted on a moving body and allows a viewer to view a virtual image based on a reflected image of projection light at a projection unit, the projection unit comprises a laminated glass including: a second glass plate disposed on an indoor side of the movable body, the second glass plate having a fourth main surface exposed to the indoor side and a third main surface opposite to the fourth main surface; a first glass plate disposed on an outdoor side of the movable body, the first glass plate having a first main surface exposed to the outdoor side and a second main surface opposite to the first main surface; and an interlayer film bonding the second main surface and the third main surface together; At least one wiper is disposed on a first main surface side of the first glass plate, the wiper sliding on the first main surface in a sliding region; A head-up display device characterized in that a reflection image forming area in which a reflection image is formed on the first main surface is within the sliding area of ​​at least one wiper and does not include the peripheral portion of the sliding area of ​​any wiper.

2. The wiper includes a first wiper that slides on the first main surface in a first sliding region, The head-up display device according to claim 1 , wherein the reflected image forming area does not include a peripheral edge portion of the first sliding area.

3. The wiper further includes a second wiper that slides on the first main surface in a second sliding region, The head-up display device according to claim 2 , wherein the reflected image forming area does not include a peripheral edge portion of the second sliding area.

4. The head-up display device according to claim 3 , wherein the first sliding area and the second sliding area partially overlap each other.

5. 5. The head-up display device according to claim 3, wherein the first wiper is arranged on the driver's seat side and the second wiper is arranged on the passenger's seat side, the first wiper and the second wiper both have drive shafts on the driver's seat side of the moving body, and the length of the first wiper is equal to or greater than the length of the second wiper.

6. The head-up display device according to any one of claims 3 to 5, wherein the first wiper is arranged on the driver's seat side and the second wiper is arranged on the passenger's seat side, and an end of a wiper blade of the second wiper on a drive shaft side is located in an area extending from the passenger's seat side end of the laminated glass to 2 / 5 of the way toward the driver's seat side.

7. The head-up display device according to any one of claims 1 to 6, further comprising a water-repellent film on the first main surface.

8. The head-up display device according to claim 7, wherein the water-repellent film has a thickness of 200 nm or less.

9. the laminated glass is provided with an optically active film that changes the vibration direction of incident projection light; the intermediate film bonds the second principal surface to the optically rotatory film and the optically rotatory film to the third principal surface, the projection light projected onto the fourth principal surface is P-polarized light, 9. The head-up display device according to claim 1, wherein a viewer observes a virtual image based on a reflected image reflected from the first main surface as S-polarized light toward the interior of the room.

10. The head-up display device according to claim 9, wherein the projection light projected onto the fourth main surface is incident on the fourth main surface at an incident angle of 50 to 65 degrees.

11. The head-up display device according to claim 9 or 10, wherein a reflected image is formed only on the first main surface.

12. 12. The head-up display device according to claim 1, wherein the reflected image forming area is 150 mm or more in the vertical direction within the first main surface.

13. 13. The head-up display device according to claim 1, wherein the reflected image forming area is 150 mm or more in the lateral direction within the first main surface.

Images