Head-up display
By designing the reflective image forming area in the laminated glass of the HUD device to avoid the periphery of the wiper sliding area, and by using a hydrophobic film, the problem of image disorder in rainy weather is solved, and clear image display is achieved in rainy weather.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- CENTRAL GLASS PRODUCTS CO LTD
- Filing Date
- 2021-12-08
- Publication Date
- 2026-04-17
AI Technical Summary
In rainy weather, the images from existing HUD devices are easily affected by water droplets and water films on the outside of the laminated glass, especially at the periphery of the wiper's sliding range, causing image distortion.
In the laminated glass of the HUD device, the reflected image forming area is located within the wiper sliding area but does not include the periphery of the sliding area, and a hydrophobic film can be optionally installed to ensure that the projected light is not affected by water droplets or water films.
On rainy days, viewers can see clear images, reducing the impact of water droplets and water films on the image and improving visibility in rainy weather.
Smart Images
Figure CN116685485B_ABST
Abstract
Description
Technical Field
[0001] This disclosure relates to head-up display devices. Background Technology
[0002] As existing head-up displays (hereinafter referred to as HUDs), wedge-shaped HUDs and polarized light HUDs are the main types known. Wedge-shaped HUDs have the following characteristics: by illuminating an image through a wedge-shaped laminated glass, the paths of the illumination light reaching the viewer's viewpoint through the laminated glass overlap, thereby reducing the blurring of the image received by the viewer, which is called "ghosting" or "image blurring".
[0003] On the other hand, polarized light type HUD has the following characteristics: by irradiating S-polarized light or P-polarized light onto a laminated glass with an interlayer film from a direction that satisfies Brewster angle, the generation of ghosting is suppressed. The interlayer film is a photodynamic film that shifts the phase of the incident light by using a resin film 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 using an interlayer such as PVB, and an optically active film is bonded to their joint surface. If S-polarized light or P-polarized light is shone onto this laminated glass, a vehicle viewer can see a HUD image with ghosting suppressed.
[0005] Existing technical documents
[0006] Patent documents
[0007] Patent Document 1: Japanese Patent Application Publication No. 6-040271. Summary of the Invention
[0008] The problem the invention aims to solve
[0009] A type of polarized HUD that utilizes P-polarized light (hereinafter also called P-HUD) has the following characteristics: If P-polarized light is shone onto the surface of the laminated glass that is in contact with the interior of the vehicle at an angle where the incident angle forms the Brewster angle, the P-polarized light is hardly reflected, but is refracted into the laminated glass and propagates. It is then converted into S-polarized light through an optically active film, reflected at the surface of the laminated glass that is in contact with the exterior, and converted back into P-polarized light through an optically active film. At the surface of the laminated glass that is in contact with the interior of the vehicle, it is almost not reflected, but is refracted out of the laminated glass and propagates, eventually entering the viewer's eyes.
[0010] Unlike polarized light HUDs that utilize S-polarized light, this type of HUD has the advantage that its performance is not affected by whether or not sunglasses are used, because the light entering the viewer's eyes is not blocked by polarized sunglasses.
[0011] However, when raindrops or a turbulent water film remain on the laminated glass during rain, a portion of the S-polarized light, converted by the optically active film, is refracted by the water droplets or film remaining on the outside of the car and propagates outwards, or reflected and propagates in unexpected directions inwards. As a result, the image seen by the viewer becomes distorted. This phenomenon is particularly noticeable at the periphery of the sliding range of the vehicle's windshield wipers.
[0012] Furthermore, in wedge-shaped HUDs, the reflected image formed on the vehicle's exterior is also disturbed due to the influence of water droplets and films remaining on the laminated glass. Similar to polarized HUDs, this phenomenon is particularly noticeable at the periphery of the sliding range of the vehicle's windshield wipers.
[0013] In view of the above problems, the object of the present invention is to provide a HUD device that allows the viewer to see a good image even on rainy days.
[0014] Solution for solving the problem
[0015] The head-up display device disclosed herein is characterized in that,
[0016] It is mounted on a moving body, allowing the viewer to see a virtual image based on the reflection of the projected light on the projection section.
[0017] The projection unit includes laminated glass, which comprises: a second glass plate disposed on the indoor side of the movable body, having a fourth main surface exposed on the indoor side and a third main surface opposite to the fourth main surface; a first glass plate disposed on the outdoor side of the movable body, having a first main surface exposed on the outdoor side and a second main surface opposite to the first main surface; and an interlayer film that bonds the second main surface and the third main surface.
[0018] At least one windshield wiper is disposed on the first main surface side of the first glass plate, and slides in the sliding area on the first main surface.
[0019] The area in which the 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 periphery of the sliding area of all wipers.
[0020] The head-up display device disclosed herein has a windshield wiper that slides in a sliding area on a first main surface, which corresponds to the outdoor side of the moving body. In rainy weather, water droplets or water films tend to remain at the periphery of the sliding area.
[0021] In the head-up display device disclosed herein, the image-forming area on the first main surface where the reflected image is formed does not include the periphery of the sliding area. That is, the image-forming area does not overlap with the periphery of the sliding area where water droplets or films are easily retained. Therefore, the effects of refraction or reflection of the projected light forming the reflected image by water droplets or films are reduced. Moreover, it can become a HUD device in which viewers can see a good image even on rainy days.
[0022] Preferably, the head-up display device of this disclosure has a first windshield wiper that slides in a first sliding area on the first main surface as the windshield wiper.
[0023] The aforementioned reflected image forming area does not include the periphery of the aforementioned first sliding area.
[0024] Preferably, the head-up display device of this disclosure further includes a second windshield wiper that slides in the second sliding area on the first main surface as the windshield wiper.
[0025] The aforementioned reflected image forming area does not include the periphery of the aforementioned second sliding area.
[0026] Furthermore, in the head-up display device disclosed herein, the first sliding area and the second sliding area may partially overlap.
[0027] In the case of a head-up display device with a second wiper, water droplets or water films can easily remain at the periphery of the second sliding area. By ensuring that the reflected image forming area does not overlap with the periphery of the second sliding area, a HUD device can be created that allows the viewer to see a better image in rainy weather.
[0028] The head-up display device disclosed herein may have the aforementioned first wiper on the driver's side and the aforementioned second wiper on the passenger's side. Both the first wiper and the second wiper may have a drive shaft on the driver's side of the moving body, and the length of the first wiper is greater than or equal to the length of the second wiper.
[0029] If this method is adopted, the position of the periphery located on the lower side of the second sliding area near the center of the laminated glass can be raised upward, wherein the second sliding area is located on the passenger side.
[0030] Typically, the lower side near the center of the laminated glass is the position where the image is most likely to be displayed, so the periphery of the second sliding area does not overlap with this part.
[0031] Preferably, in the head-up display device of this disclosure, the first main surface also has a hydrophobic film.
[0032] In addition, preferably, the thickness of the hydrophobic membrane is less than 200 nm.
[0033] If a hydrophobic film is present on the first principal surface, water droplets and water films are less likely to remain on the first principal surface, thus further improving the visibility of images during rainy weather.
[0034] Preferably, in the head-up display device of this disclosure, the laminated glass has an optically active film that alters the vibration direction of the incident projected light.
[0035] The aforementioned intermediate film respectively bonds the second main surface to the optically active film, and the optically active film to the third main surface.
[0036] The projected light projected onto the fourth principal plane is P-polarized light.
[0037] The viewer observes a virtual image based on the reflected image of the S-polarized light reflected from the aforementioned first principal surface to the indoor side.
[0038] The head-up display device described above is a P-HUD type HUD device (P-HUD device). In the P-HUD device, since the water droplets and water film remaining on the outside of the vehicle on the laminated glass have a greater impact at the periphery of the wiper's sliding range, the HUD device of this disclosure, which can mitigate this impact, can better perform.
[0039] Preferably, in the head-up display device of this disclosure, the projected light projected onto the fourth main surface is incident at an incident angle of 50 to 65° relative to the fourth main surface.
[0040] If the projection light projected onto the fourth principal surface is incident at an angle of 50 to 65° relative to the fourth principal surface, since the incident angle is near Brewster's angle, the proportion of P-polarized light reflected by the fourth principal surface is small, and almost all of it propagates into the laminated glass. Therefore, the brightness of the virtual image can be improved, and the overlap between the projection light reflected by the fourth principal surface and the projection light reflected by the first principal surface and emitted from the fourth principal surface can be suppressed.
[0041] Preferably, in the head-up display device of this disclosure, a reflected image is formed only on the first main surface.
[0042] Preferably, in the head-up display device of this disclosure, the reflected image forming area is 150 mm or more in the longitudinal direction within the first main surface.
[0043] Preferably, in the head-up display device of this disclosure, the reflected image forming area is 150 mm or more in the lateral direction within the first main surface.
[0044] Invention Effects
[0045] The present invention provides a HUD device that allows viewers to see a good image even in rainy weather. Attached Figure Description
[0046] Figure 1 This is an outline of a HUD device according to an embodiment of the present invention and a schematic diagram of the optical path in the device.
[0047] Figure 2 It is a schematic diagram showing the first wiper, the first sliding area, and the first periphery of the first main surface.
[0048] Figure 3 It is a schematic diagram showing the second wiper, the second sliding area, and the second periphery of the first main surface.
[0049] Figure 4 This is a schematic diagram illustrating an example of a HUD device with two wipers, showing a first wiper, a first sliding area and a first periphery, a second wiper, a second sliding area and a second periphery, and a reflected image forming area on the first main surface.
[0050] Figure 5 This is a schematic diagram illustrating, simultaneously, a first main surface of a HUD device with two wipers, including a first wiper, a first sliding area and a first periphery, a second wiper, a second sliding area and a second periphery, and a reflected image forming area.
[0051] Figure 6 This is a schematic diagram illustrating an example of a first wiper, a first sliding area, a first peripheral portion, and a reflected image forming area on the first main surface of a HUD device having one wiper.
[0052] Figure 7 This is a diagram showing the location of the reflected image forming area set in the embodiments and comparative examples.
[0053] Figure 8 It is a photograph showing the virtual image seen in Embodiment 1.
[0054] Figure 9 This is a photograph showing the virtual image as seen in Embodiment 2.
[0055] Figure 10 This is a photograph showing the virtual image observed in Embodiment 3.
[0056] Figure 11 This is a photograph showing the virtual image as seen in Embodiment 4.
[0057] Figure 12 This is a photograph showing the virtual image observed in Comparative Example 1.
[0058] Figure 13This is a photograph showing the virtual image observed in Comparative Example 2. Detailed Implementation
[0059] The head-up display (HUD) device according to embodiments of the present invention will be described using the accompanying drawings.
[0060] The following explanation addresses the case where the head-up display device is a P-HUD device.
[0061] Examples of mobile bodies include vehicles (passenger cars, trucks, buses, electric trains, etc.), trains, ships, and airplanes. Among these, vehicles are preferred.
[0062] The moving body has laminated glass that serves as a projection section.
[0063] The laminated glass comprises: a second glass plate disposed on the indoor side of the movable body, having a fourth main surface exposed on the indoor side and a third main surface opposite to the fourth main surface; a first glass plate disposed on the outdoor side of the movable body, having a first main surface exposed on the outdoor side and a second main surface opposite to the first main surface; and an interlayer film that bonds the second main surface to the third main surface.
[0064] In the case of a P-HUD device, the laminated glass has an optically active film that changes the vibration direction of the incident projection light. An intermediate film bonds the second principal surface to the optically active film and the optically active film to the third principal surface. The projection light projected onto the fourth principal surface is P-polarized light. The viewer observes a virtual image based on the reflected image reflected from the first principal surface to the indoor side as S-polarized light.
[0065] In laminated glass, the first and second glass plates are joined together as a single structure via an interlayer. The interlayer is not particularly limited as long as it can bond to both the glass plates and the optically active film. For example, the interlayer is a film that bonds the first and second glass plates together by heating it to a temperature at which the polymer constituting the interlayer softens. As the polymer, polyvinyl butyral (PVB), ethylene vinyl acetate (EVA), acrylic resin (PMMA), polyurethane resin, polyethylene terephthalate (PET), cyclic olefin polymers (COP), etc., can be used. Additionally, adhesives and bonding agents that cure through moisture, ultraviolet light, etc., can also be used. Furthermore, the interlayer can also be composed of multiple resin layers.
[0066] The glass materials constituting laminated glass can be materials that can be processed from flat glass sheets into curved shapes. Besides soda-lime silicate glass as specified in ISO 16293-1, known glass materials such as aluminosilicate glass, borosilicate glass, and alkali-free glass can also be used as the glass sheet material. The thickness of each of the first and second glass sheets can be, for example, set to 0.4 mm to 3 mm. Furthermore, the spacing between the first and second glass sheets can be set to 0.01 mm to 2.5 mm.
[0067] Optical rotation films shift the phase of the projected light incident on the projection surface or change the vibration direction of the projected light. For example, when the optical rotation film is a 1 / 2 wavelength film, if the angle between the vibration direction of the projected light incident on the projection surface and the optical axis is set as dθ, the vibration direction of the incident projected light will be rotated by 2dθ.
[0068] Furthermore, as an optically active film, it may also include a layer or film without a substrate. For example, an optically active film in which a layer with an optical axis is formed in the projection section by coating, lamination, pasting, adhesion, pressing, transfer, etc.
[0069] As an optically active film, a half-wavelength film or a quarter-wavelength film can be used. Alternatively, two quarter-wavelength films can be overlapped for use.
[0070] The optically active film is disposed between the second principal surface of the first glass plate and the third principal surface of the second glass plate.
[0071] In addition, the second main surface of the first glass plate and the optically active film are bonded together by an intermediate film, and the third main surface of the second glass plate and the optically active film are bonded together by an intermediate film.
[0072] Figure 1 This is an outline of a HUD device according to an embodiment of the present invention and a schematic diagram of the optical path in the device.
[0073] exist Figure 1 In the image, the light path of the projected light is shown in solid lines.
[0074] In HUD device 1, the projection part is vehicle laminated glass 10.
[0075] The laminated glass 10 for vehicles has a second glass panel 12 disposed on the interior side of the vehicle and a first glass panel 11 disposed on the exterior side of the vehicle.
[0076] The second glass panel 12 has a fourth main surface 124 exposed on the indoor side and a third main surface 123 on the opposite side of the fourth main surface 124.
[0077] The first glass panel 11 has a first main surface 111 exposed on the outdoor side and a second main surface 112 on the opposite side of the first main surface 111.
[0078] An optically active film 100 is disposed between the first glass plate 11 and the second glass plate 12.
[0079] In addition, the first glass plate 11 and the second glass plate 12 are joined together via an intermediate film 20. The second main surface 112 of the first glass plate 11 and the optically active film 100 are bonded together via the intermediate film 20, and the third main surface 123 of the second glass plate 12 and the optically active film 100 are bonded together via the intermediate film 20.
[0080] In addition, the optically active film can be configured on the entire surface or partially. Preferably, the total area of the optically active film facing the second and third main surfaces is less than or equal to the area of the second and third main surfaces.
[0081] In the HUD device 1, projection light 60 is shone from the image unit 31.
[0082] Here, the plane containing the light-emitting point 32 of the image unit 31, the reflection point 33 of the projected light 60 reflected from the first main surface 111, and the viewpoint 34 of the viewer 35 is the incident surface.
[0083] Preferably, the imaging unit 31 is configured in the vehicle's dashboard or the like.
[0084] The projected light from the image unit 31 onto the fourth main surface 124 is P-polarized light whose vibration direction is parallel to the incident surface.
[0085] When the projected light is P-polarized light, it can be used even in sunglasses mode, where the virtual image is observed through polarized sunglasses. Furthermore, in Figure 1 The device uses polarized sunglasses 36, and of course, the virtual image can be observed even with the naked eye.
[0086] First, the projection light 60 emitted from the image unit 31 illuminates the fourth principal surface 124. The preferred angle at this time is the Brewster angle. Generally, since P-polarized light incident at the Brewster angle does not produce reflection, the reflection on the fourth principal surface 124 that causes ghosting can be suppressed.
[0087] In the HUD device 1, the projected light projected onto the fourth main surface preferably has an incident angle of 50 to 65°.
[0088] Next, the projection light 60 advancing in the projection section changes its vibration direction when it enters the optically active film 100.
[0089] In the HUD device 1, reflection can occur on any surface other than the fourth principal surface. Therefore, as the optically active film 100, a half-wavelength film, a quarter-wavelength film, etc., can be used. Alternatively, two quarter-wavelength films can be overlapped for use.
[0090] The vibration direction of light after passing through the optical rotation film 100 varies depending on the type of optical rotation film and the orientation of the optical axis. For example, when using a 1 / 2 wavelength film as the optical rotation film, when the angle between the vibration direction of the projection light incident on the projection surface and the optical axis of the optical rotation film is set as dθ, the vibration direction of the projection light becomes a direction rotated by 2dθ.
[0091] As an optically active film, it is possible to use phase difference elements formed by uniaxial or biaxial stretching of plastic films such as polycarbonate, polyarylate, polyethersulfone, cyclic olefin polymers, triacetyl cellulose, polyethylene terephthalate (PET), and polyethylene naphthalate (PEN), as well as optically active elements formed by oriented liquid crystal polymers in a specific direction and fixing the orientation state.
[0092] As the former, phase difference elements are formed by uniaxial or biaxial stretching of plastic films. For example, elements can be made using methods such as solvent casting and melt extrusion. In the solvent casting method, a polymer resin is dissolved in a solvent, coated onto a smooth surface of materials such as stainless steel strip or polyethylene terephthalate (PET), and after the solvent evaporates, the film is rolled up. In the melt extrusion method, a polymer resin is placed in an extruder, heated and melted, extruded from a slit (T-die), cooled, and then the film is rolled up. For stretching, a stretching machine is generally used, which can obtain optically active films that can be stretched in the longitudinal, transverse, and oblique directions.
[0093] As an optically active element of the latter, for example, an optically active element can be used which is formed by coating a liquid crystal polymer on a transparent substrate such as a transparent plastic film such as polyethylene terephthalate (PET) or triacetyl cellulose (TAC) after orientation treatment, and fixing the liquid crystal orientation by heat treatment, ultraviolet irradiation, etc.
[0094] As examples of the aforementioned liquid crystal polymers, there are no particular limitations as long as the compound exhibits liquid crystal properties such as nematic liquid crystal, twisted nematic liquid crystal, discoid liquid crystal, or cholesterol-type liquid crystal when oriented in a specific direction. For example, polymers that are twisted nematically oriented in the liquid crystal state and become glassy below the liquid crystal transition point can be used, such as optically active polyesters, polyamides, polycarbonates, polyesterimides, and other main-chain liquid crystal polymers, as well as optically active polyacrylates, polymethacrylates, polymalonates, polysiloxanes, and other side-chain liquid crystal polymers. Furthermore, polymer compositions in which other low- or high-molecular-weight optically active compounds are added to these non-optically active main-chain or side-chain polymers can also be exemplified.
[0095] Next, the projected light is reflected when it reaches the first principal surface 111, forming a reflected image. At this time, the S-polarized light is reflected as reflected light, while the other light that is not reflected passes through the first principal surface 111 and is emitted to the outside.
[0096] Next, the reflected image formed on the first principal surface 111 is again converted into P-polarized light by the optical rotation film 100. The viewer 35 views a virtual image 621 based on the reflected image on the first principal surface 111, located on the extension line of the optical path 62.
[0097] The virtual image 621 is formed by P-polarized light, so the viewer 35 can see the virtual image 621 even through polarized sunglasses 36.
[0098] In this case, the viewer observes a virtual image based on the reflected image formed on the outdoor side (i.e., the first main surface) of the first glass plate.
[0099] Furthermore, in the case where a reflective layer is provided to reflect light before it reaches the first principal surface 111, reflection occurs in this layer. In this case, if unreflected light reaches the first principal surface 111 and is further reflected, the reflection may sometimes cause ghosting. Therefore, in the case where reflection occurs before reaching the first principal surface 111, it is preferable to change the vibration direction of the light before reaching the first principal surface 111 so that it becomes P-polarized light again.
[0100] If such a situation is involved, it is preferable that the viewer observes a virtual image based on a reflected image formed outside the interior side of the second glass plate. "Reflected image formed outside the interior side of the second glass plate" also includes "reflected image formed outside the exterior side of the first glass plate".
[0101] The HUD device according to an embodiment of the present invention is provided with at least one wiper that slides in a sliding area on a first main surface.
[0102] Furthermore, the feature is that the area in which the 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 periphery of the sliding areas of all wipers.
[0103] As long as the number of windshield wipers configured in the HUD device is at least one, but in the case of windshield wipers used in vehicles, it is usually one or two.
[0104] First, let's explain the case where there are two windshield wipers.
[0105] When there are two windshield wipers, they will be referred to as the first wiper and the second wiper. Assume that the first wiper is located on the driver's side and the second wiper is located on the passenger's side.
[0106] The area where the first wiper slides on the first main surface is defined as the first sliding area, and the periphery of the first sliding area is referred to as the first periphery.
[0107] The area where the second wiper slides on the first main surface is designated as the second sliding area, and the periphery of the second sliding area is referred to as the second periphery.
[0108] In the HUD device of this embodiment, as a windshield wiper, there is a first windshield wiper that slides in a first sliding area on a first main surface, and the image formation area on the first main surface that forms a reflected image does not include the periphery of the first sliding area. Additionally, as a windshield wiper, there is also a second windshield wiper that slides in a second sliding area on the first main surface, and the image formation area on the first main surface that forms a reflected image does not include the periphery of the second sliding area.
[0109] Figure 2 This is a schematic diagram showing the first wiper, the first sliding area, and the first peripheral portion of the first main surface. Figure 2 The image shown is a view from the interior side (the fourth side of the laminated glass).
[0110] Furthermore, in this specification, the wiper path is shown by depicting the wiper in multiple locations within the same diagram, in the various illustrations of the wipers. For example, in Figure 2 Although the first wiper is shown in four locations, the number of first wipers in this HUD device is one.
[0111] exist Figure 2The image shows a first windshield wiper 41, and the area where the first windshield wiper 41 slides on the first main surface 111 is shown as a first sliding area 71. The first sliding area 71 is the area where water droplets adhering to the first main surface 111 are wiped away by the first windshield wiper 41. The periphery of the first sliding area 71 is shown as a first peripheral portion 81 with thick lines. The first peripheral portion 81 is the area where water droplets wiped away by the first windshield wiper 41 accumulate.
[0112] Figure 3 This is a schematic diagram showing the second wiper, the second sliding area, and the second periphery of the first main surface. Figure 3 The image shown is a view from the interior side (the fourth side of the laminated glass).
[0113] exist Figure 3 The second windshield wiper 42 is shown, and the area where the second windshield wiper 42 slides on the first main surface 111 is shown as the second sliding area 72. The second sliding area 72 is the area where water droplets attached to the first main surface 111 are wiped away by the second windshield wiper 42. The periphery of the second sliding area 72 is shown as the second peripheral area 82 with thick lines. The second peripheral area 82 is the area where water droplets wiped away by the second windshield wiper 42 accumulate.
[0114] Figure 4 This is a schematic diagram illustrating an example of a HUD device with two wipers, showing a first wiper, a first sliding area and a first periphery, a second wiper, a second sliding area and a second periphery, and a reflected image forming area on the first main surface.
[0115] exist Figure 4 The diagram shows an overall view of the HUD device 1.
[0116] HUD device 1 has in Figure 2 and Figure 3 The first wiper 41 and the second wiper 42 are described in the text. Additionally, in... Figure 4 The image shows a first sliding region 71 and a first peripheral portion 81, as well as a second sliding region 72 and a second peripheral portion 82.
[0117] The first sliding region 71 and the second sliding region 72 partially overlap. The area where the first sliding region 71 and the second sliding region 72 are merged is called the full sliding region 70.
[0118] A portion of the first peripheral portion 81 is included in the second sliding region 72. Additionally, a portion of the second peripheral portion 82 is included in the first sliding region 71. The portion combining the first peripheral portion 81 and the second peripheral portion 82 is termed the full peripheral portion 80. The full peripheral portion 80 includes both the first peripheral portion 81 included in the second sliding region 72 and the second peripheral portion 82 included in the first sliding region 71.
[0119] The full perimeter portion 80 is the area where water droplets wiped away by the first wiper 41 and the second wiper 42 working together to wipe away water droplets attached to the first main surface 111.
[0120] The HUD device according to an embodiment of the present invention is characterized in that the reflective image forming area of the first main surface is located within the sliding area of at least one wiper and does not include the periphery of the sliding areas of all wipers.
[0121] The following are specific ways in which the reflected image is formed.
[0122] (1) The entire reflected image forming area is located inside the first sliding area and outside the second sliding area.
[0123] (2) The entire reflected image forming area is located inside the second sliding area and outside the first sliding area.
[0124] (3) The entire reflected image forming area is located inside the first sliding area and inside the second sliding area. That is, the entire reflected image forming area is located inside the area where the first sliding area and the second sliding area overlap.
[0125] The area where the reflected image is formed and Figure 4 The lines that constitute the entire perimeter 80 shown do not overlap.
[0126] exist Figure 4 The image shows a reflection image forming region 51, a reflection image forming region 52, and a reflection image forming region 53 as examples of reflection image forming regions.
[0127] The reflected image forming region 51 is a reflected image forming region whose entirety is located inside the first sliding region 71, which is the sliding region of the first wiper 41, and whose entirety is located outside the second sliding region 72, which is the sliding region of the second wiper 42.
[0128] The reflected image forming region 52 is a reflected image forming region whose entirety is located inside the second sliding region 72, which is the sliding region of the second wiper 42, and whose entirety is located outside the first sliding region 71, which is the sliding region of the first wiper 41.
[0129] The reflected image forming region 53 is a reflected image forming region whose entirety is located inside the first sliding region 71, which is the sliding region of the first wiper 41, and whose entirety is located inside the second sliding region 72, which is the sliding region of the second wiper 42.
[0130] The reflected image forming regions 51, 52, and 53 do not overlap with any line constituting the entire perimeter 80.
[0131] The full perimeter portion 80 is the area where water droplets wiped away by the first wiper 41 and the second wiper 42 working together to wipe away water droplets attached to the first main surface 111.
[0132] That is, in the HUD device of the present invention, the reflective image forming area on the first main surface does not overlap with the area where water droplets accumulate.
[0133] Therefore, the image seen by the viewer will not be affected by water droplets accumulated on the first main surface of the laminated glass during rainy weather. Moreover, the viewer can still see a good image even on rainy days.
[0134] When the head-up display device of this disclosure is required, it is preferable that the reflected image forming area 51 to 53 is 150 mm or more in the longitudinal direction within the first main surface.
[0135] In addition, it is preferable that the horizontal dimension within the first main surface is 150 mm or more.
[0136] In a preferred embodiment of the present invention, the HUD device also has a hydrophobic film on the first main surface. Because of the hydrophobic film, raindrops are difficult to spread on the first main surface, making it easy to wipe them away with a windshield wiper, and preventing raindrops from remaining on the first main surface.
[0137] The preferred thickness of the hydrophobic membrane is below 200 nm. Even if the thickness is set above 200 nm, it is difficult to improve its effect. If the membrane thickness is too thick, problems such as membrane cracks, uneven membrane thickness leading to perspective distortion, increased haze, and significant damage caused by external contact may occur.
[0138] In the HUD device of the present invention, a first wiper is preferably arranged on the driver's side and a second wiper is arranged on the passenger side. Both the first wiper and the second wiper have a drive shaft on the driver's side of the moving body, and the length of the first wiper is greater than or equal to the length of the second wiper.
[0139] The following describes this implementation method.
[0140] Figure 5This is a schematic diagram illustrating, simultaneously, a first main surface of a HUD device with two wipers, including a first wiper, a first sliding area and a first periphery, a second wiper, a second sliding area and a second periphery, and a reflected image forming area.
[0141] exist Figure 5 In the HUD device 2 shown, 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 side of the moving body.
[0142] exist Figure 5 In the manner shown, with Figure 4 Compared to the method shown, the second wiper is shorter.
[0143] In addition, the lengths of the first and second wipers are the lengths of the wiper blades (actually the lengths of the rubber part that wipes away water droplets).
[0144] If the second wiper is short, the peripheral portion 82b located below the second sliding area 72 can be positioned near the center of the laminated glass. Figure 5 The position of the portion shown in thick lines is raised upwards. Thus, the first sliding region 71 below the peripheral portion 82b can be expanded and used as a reflected image forming region.
[0145] The area shown as the reflected image forming area 53′ is typically the area on the lower side near the center of the laminated glass where the image is most desired to be displayed. Therefore, a structure that allows the position of the peripheral portion 82b to be raised is preferred.
[0146] Furthermore, in the HUD device of the embodiment of the present invention, it is preferable to arrange a first wiper on the driver's side and a second wiper on the passenger side, wherein the wiper blade of the second wiper is located at the end of the drive shaft side of the laminated glass in a region extending from the passenger side end toward the driver's side up to 2 / 5 of the way.
[0147] The following describes this implementation method.
[0148] Take the distance from the passenger side end to the driver side end of the laminated glass as a whole (set the scale to 1). Then, determine the area from the passenger side end toward the driver side up to 2 / 5 of the above whole (scale 1).
[0149] The end of the second wiper blade on the drive shaft side corresponds to the right end when the wiper blade is at its lowest position. If its position enters the aforementioned area up to 2 / 5, the peripheral portion 82b located below the second sliding area 72 (in the peripheral portion 82) near the center of the laminated glass can be... Figure 5The part shown in thick lines rises upwards.
[0150] Furthermore, more preferably, the end of the second wiper blade on the drive shaft side is located in one-third of the area of the laminated glass from the passenger side end toward the driver side.
[0151] Next, we will explain the case where there is only one windshield wiper.
[0152] When there is only one windshield wiper, it has only a first wiper that slides primarily on the driver's side. This first wiper is typically configured to slide over a wider range than the first wiper in the case of two wipers.
[0153] Figure 6 This is a schematic diagram illustrating an example of a HUD device with one windshield wiper, including a first wiper, a first sliding area, a first peripheral portion, and a reflected image forming area on the first main surface. Figure 6 The image shown is a view from the interior side (the fourth side of the laminated glass).
[0154] exist Figure 6 The diagram shows an overall view of the HUD device 3.
[0155] HUD device 3 has a first wiper 141.
[0156] exist Figure 6 In the diagram, the area where the first wiper 141 slides on the first main surface 111 is shown as the first sliding area 171. The first sliding area 171 is the area where the first wiper 141 wipes away water droplets adhering to the first main surface 111. The periphery of the first sliding area 171 is shown as the first peripheral portion 181 with a thick line. The first peripheral portion 181 is the area where water droplets wiped away from the first main surface 111 accumulate when the first wiper 141 wipes away water droplets adhering to the first main surface 111.
[0157] When there is only one windshield wiper, the first sliding area is the same as the full sliding area, and the first peripheral portion is the same as the full peripheral portion.
[0158] The area where the reflected image is formed and Figure 6 None of the lines forming the first periphery 181 shown overlap.
[0159] exist Figure 6 The image-forming region 151 is shown as an example of an image-forming region.
[0160] The reflected image forming region 151 is the reflected image forming region located within the first sliding region 171 of the first wiper 141.
[0161] The reflected image forming region 151 does not overlap with any lines constituting the first periphery 181.
[0162] The first peripheral portion 181 is the area where water droplets wiped away by the first wiper 141 when it wipes away water droplets attached to the first main surface 111.
[0163] That is, in the HUD device of the present invention, the reflective image forming area on the first main surface does not overlap with the area where water droplets accumulate.
[0164] This concludes the explanation of the case where the head-up display device of this disclosure is a P-HUD device, but the head-up display device of this disclosure may also be a wedge-shaped HUD device.
[0165] In a wedge-shaped HUD device, by setting the projection part as a component with a wedge-shaped profile that gradually changes in thickness, the light path of the projection light is adjusted so that the virtual image viewed by the viewer based on the first reflected image reflected from the fourth principal surface is consistent with the virtual image based on the second reflected image reflected from the first principal surface.
[0166] Although the second reflected image reflected from the first main surface is affected by water droplets and water films remaining on the outside of the laminated glass, the area forming the second reflected image is located within the sliding area of at least one windshield wiper and does not include the periphery of the sliding area of all windshield wipers. This mitigates the effects of refraction or reflection of the projected light forming the reflected image by water droplets and water films. Furthermore, it enables a HUD device that allows viewers to see a good image even in rainy weather.
[0167] In the case of laminated glass used as the projection part of a wedge-shaped HUD device, laminated glass with an inclined thickness of the interlayer or glass plate is used.
[0168] By using laminated glass with an inclined thickness in the intermediate film or glass plate, the projection section can have a wedge-shaped profile with gradually changing thickness in the region of the first or second reflected image.
[0169] Example
[0170] The following experiment was conducted: the positional relationship between the area where the reflected image is formed on the first principal surface and the sliding area of the windshield wiper was changed, and the visibility of the virtual image was compared.
[0171] Experiments were conducted using a P-HUD device.
[0172] Figure 7 This is a diagram showing the location of the reflected image forming area set in the embodiments and comparative examples.
[0173] As an example, reflective image forming regions 51 and 53 are defined.
[0174] These areas where reflected images are formed are references. Figure 4 The area described is located within the sliding area of at least one wiper but does not include the periphery of the sliding areas of all wipers.
[0175] As a comparative example, a reflected image forming region 54 was defined.
[0176] The reflected image forming region 54 is the region that includes the second peripheral portion 82 of the second wiper 42.
[0177] Reflected images were formed in each of the reflected image forming areas set up as examples and comparative examples. Simulating a rainy situation, water was continuously sprayed onto the first main surface, and the first and second windshield wipers were activated, and the visibility of the virtual image was observed.
[0178] In addition, simulating the formation of a reflected image outside the sliding area of the windshield wiper, a reflected image is formed in the same area as the reflected image formation area 51 while water is continuously sprayed onto the first principal surface and the windshield wipers are not in operation. The visibility of the virtual image is then observed. This example serves as a comparative example.
[0179] Regarding the embodiments, the following experiments were conducted: the visibility of the virtual image was observed in the same way for the case where the first main surface has a hydrophobic film and the case where it does not have a hydrophobic film.
[0180] The thickness of the hydrophobic membrane is set to 8 nm.
[0181] Regarding the comparative example, only the case where the first main surface does not have a hydrophobic film was tested.
[0182] Table 1 below summarizes the experiment and shows the relationship between the experimental results and graphs.
[0183] Figure 8 It is a photograph showing the virtual image seen in Embodiment 1.
[0184] Figure 9 This is a photograph showing the virtual image as seen in Embodiment 2.
[0185] Figure 10 This is a photograph showing the virtual image observed in Embodiment 3.
[0186] Figure 11 This is a photograph showing the virtual image as seen in Embodiment 4.
[0187] Figure 12 This is a photograph showing the virtual image observed in Comparative Example 1.
[0188] Figure 13 This is a photograph showing the virtual image observed in Comparative Example 2.
[0189] [Table 1]
[0190]
[0191] The evaluation of the visibility of virtual images is as follows.
[0192] ○: The virtual image has good visibility and no distortion is produced.
[0193] △: A virtual image can be seen, and the virtual image is not distorted.
[0194] ×: Distortion has occurred in a part (periphery) or the whole of the virtual image.
[0195] In Examples 1 to 4, no distortion occurred in the virtual image. Furthermore, in Examples 2 and 4, where the first main surface has a hydrophobic film, the visibility of the virtual image was particularly good.
[0196] In Comparative Example 1, since the reflected image forming area includes the second periphery, the virtual image in the second periphery is distorted.
[0197] In addition, in Comparative Example 2, an area where water droplets were not wiped away by windshield wipers was simulated, and the virtual image was distorted in this area.
[0198] Explanation of reference numerals in the attached figures
[0199] 1, 2, 3: HUD device;
[0200] 10: Laminated glass for vehicles;
[0201] 11: First glass plate;
[0202] 12: Second glass plate;
[0203] 20: Intermediate membrane;
[0204] 31: Imaging Department;
[0205] 32: Light-emitting point;
[0206] 33: Reflection point;
[0207] 34: Viewpoint;
[0208] 35: The viewer;
[0209] 36: Polarized sunglasses;
[0210] 41, 141: First windshield wiper;
[0211] 42: Second windshield wiper;
[0212] 51, 151: Reflected image forming region (the reflected image forming region located inside the first sliding region);
[0213] 52: Reflected image forming region (the reflected image forming region located inside the second sliding region);
[0214] 53: Reflected image forming region (the reflected image forming region located inside the first sliding region and the second sliding region);
[0215] 53′: Reflected image forming region (first sliding region below the peripheral portion 82b);
[0216] 54: Reflected image forming area (including the reflected image forming area at the periphery);
[0217] 60: Projected light;
[0218] 62: The optical path based on the reflected image formed on the first principal surface;
[0219] 70: Full sliding area;
[0220] 71, 171: First sliding area;
[0221] 72: Second sliding area;
[0222] 80: The entire perimeter;
[0223] 81, 181: First perimeter;
[0224] 82: Second perimeter;
[0225] 82b: The peripheral portion located on the lower side of the second sliding region;
[0226] 91: Drive shaft of the first windshield wiper;
[0227] 92: Drive shaft of the second windshield wiper;
[0228] 100: Optical active film;
[0229] 111: First main face;
[0230] 112: Second main face;
[0231] 123: The third main face;
[0232] 124: The fourth main face;
[0233] 621: Virtual image.
Claims
1. A head-up display device, characterized in that, It is mounted on a moving body, allowing the viewer to see a virtual image based on the reflection of the projected light on the projection section. The projection section has laminated glass, which has: a second glass plate disposed on the interior side of the movable body, having a fourth main surface exposed on the interior side and a third main surface on the opposite side of the fourth main surface; A first glass panel is disposed on the outdoor side of the mobile body, having a first main surface exposed on the outdoor side and a second main surface opposite to the first main surface; And an intermediate film that bonds the second main surface to the third main surface. At least one windshield wiper is disposed on the first main surface side of the first glass plate, and slides in the sliding area on the first main surface. The area in which the reflected 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 periphery of the sliding area of all wipers.
2. The head-up display device according to claim 1, wherein, As the windshield wiper, a first windshield wiper has a first sliding area that slides in the first main surface. The reflected image forming area does not include the periphery of the first sliding area.
3. The head-up display device according to claim 2, wherein, As the windshield wiper, it also includes a second windshield wiper that slides in a second sliding area on the first main surface. The reflected image forming area does not include the periphery of the second sliding area.
4. The head-up display device according to claim 3, wherein, The entire reflected image forming area is located inside the first sliding area and outside the second sliding area.
5. The head-up display device according to claim 3, wherein, The entire area of the reflected image formation is located inside the second sliding area and outside the first sliding area.
6. The head-up display device according to claim 3, wherein, The first sliding region and the second sliding region partially overlap.
7. The head-up display device according to claim 6, wherein, The entire reflected image forming area is located inside the first sliding area and inside the second sliding area.
8. The head-up display device according to claim 3 or 6, wherein, The first windshield wiper is disposed on the driver's side and the second windshield wiper is disposed on the passenger side. Both the first windshield wiper and the second windshield wiper have a drive shaft on the driver's side of the moving body, and the length of the first windshield wiper is greater than the length of the second windshield wiper.
9. The head-up display device according to any one of claims 3 to 7, wherein, The first wiper is located on the driver's side, and the second wiper is located on the passenger side. The end of the wiper blade of the second wiper on the drive shaft side is located in the area of the laminated glass from the passenger side end toward the driver's side up to 2 / 5 of the way.
10. The head-up display device according to claim 9, wherein, The end of the wiper blade of the second wiper on the drive shaft side is located in the area of the laminated glass from the passenger side end toward the driver side up to 1 / 3 of the way.
11. The head-up display device according to any one of claims 1 to 7, wherein, The first main surface also has a hydrophobic film.
12. The head-up display device according to claim 11, wherein, The thickness of the hydrophobic membrane is less than 200 nm.
13. The head-up display device according to any one of claims 1 to 7, wherein, The laminated glass has an optically active film that alters the vibration direction of the incident projected light. The intermediate film bonds the second main surface to the optically active film and the optically active film to the third main surface, respectively. The projected light projected onto the fourth principal surface is P-polarized light. The viewer sees a virtual image based on the reflected image of S-polarized light reflected from the first principal surface to the indoor side.
14. The head-up display device according to claim 13, wherein, The projected light projected onto the fourth principal surface is incident at an incident angle of 50 to 65° relative to the fourth principal surface.
15. The head-up display device according to claim 13, wherein, A reflected image is formed only on the first main surface.
16. The head-up display device according to claim 13, wherein, A 1 / 2 wavelength film is used as the optically active film.
17. The head-up display device according to claim 13, wherein, A quarter-wavelength film is used as the optically active film.
18. The head-up display device according to claim 13, wherein, As the optically active film, two quarter-wavelength films are overlapped for use.
19. The head-up display device according to claim 13, wherein, The optically active film is configured across the entire surface.
20. The head-up display device according to claim 13, wherein, The optically active film is partially configured.
21. The head-up display device according to claim 13, wherein, The total area of the optically active film facing the second main surface and the third main surface is less than or equal to the area of the second main surface and the third main surface.
22. The head-up display device according to any one of claims 1 to 7, wherein, The area where the reflected image is formed is more than 150 mm in the longitudinal direction within the first main surface.
23. The head-up display device according to any one of claims 1 to 7, wherein, The reflected image forming area is more than 150 mm in the horizontal direction within the first main surface.
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