Head-up display

Abstract

The present invention provides a head-up display (HUD) capable of suppressing degradation of the image quality of a projected virtual image even when a first reflector is rotated. The HUD (10) projects a virtual image onto a display medium (11), and includes: a display unit (13) emitting display light to be a display image; a first reflector (14) guiding the image displayed by the display unit (13) toward the display medium (11) to form a virtual image on the side opposite to the observer relative to the display medium (11); the first reflector (14) includes a base (16) having a first surface (17) and a second surface (18) as the back surface of the first surface (17); and a reflecting surface (20) provided on the first surface (17); the base (16) includes an edge portion (21) having a rough surface between the reflecting surface (20) of the first surface (17) and the outer periphery of the base (16); and a rib (22) is provided on the back side of the edge portion (21).

Description

Technical Field

[0001] The present disclosure relates to a head-up display mounted on a vehicle or the like, for example. Background Art

[0002] Conventionally, a head-up display mounted on a vehicle or the like has been proposed (see Patent Document 1). Patent Document 1 discloses a head-up display including a concave mirror having an inclined edge portion and a concave mirror having an embossed edge portion.

[0003] Prior art literature

[0004] Patent Literature

[0005] Patent Document 1: International Publication No. 2017 / 208961 Summary of the Invention

[0006] Problems to be solved by the invention

[0007] Conventional head-up displays (HUDs) have used a method of counteracting shrinkage marks by forming steps or embossing the edges of concave mirrors during manufacturing. However, this thinning of the edges reduces rigidity. Consequently, the concave mirrors used in conventional HUDs sometimes flex significantly, causing distortion in the projected image. This deflection of the concave mirror degrades the quality of the virtual image around the visible area, reducing the image quality of the HUD.

[0008] Therefore, the present disclosure provides a head-up display that prevents degradation of image quality around a visually recognizable area and improves image quality.

[0009] Solutions for solving problems

[0010] A head-up display according to a technical solution of the present disclosure projects a virtual image onto a display medium, wherein the head-up display includes: a display unit that emits display light to become a displayed image; and a first reflector that forms a virtual image on the side of the display medium opposite to the observer by guiding the image displayed by the display unit toward the display medium, the first reflector having a base having a first surface provided with a reflective surface and a second surface serving as a back surface of the first surface, the base having an edge portion provided with a rough surface between the reflective surface and the outer periphery of the base, and a rib provided on the back side of the edge portion.

[0011] A head-up display according to a technical solution of the present disclosure projects a virtual image onto a display medium, wherein the head-up display includes: a display unit that emits display light to become a displayed image; and a first reflector that forms a virtual image on the side of the display medium opposite to the observer by guiding the image displayed by the display unit toward the display medium, the first reflector having a base having a first surface provided with a reflecting surface and a second surface serving as the back surface of the first surface, the base having an edge portion between the reflecting surface and the outer periphery of the base that is stepped back toward the second surface, and a rib is provided on the back side of the edge portion.

[0012] Effects of the Invention

[0013] According to a technical solution of the head-up display of the present disclosure, the image quality of a virtual image projected from the head-up display can be improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 Schematic diagram of a head-up display according to an embodiment.

[0015] Figure 2 This is a top view of the first reflector of the head-up display.

[0016] Figure 3 This is a bottom perspective view of the first reflecting mirror.

[0017] Figure 4 This is a cross-sectional view of the first reflecting mirror taken along line AA.

[0018] Figure 5 It is a top view of the first reflecting mirror of the modification.

[0019] Figure 6 It is a cross-sectional view of a first reflecting mirror according to a modified example.

[0020] Figure 7 It is a schematic diagram of a head-up display according to a modified example. DETAILED DESCRIPTION

[0021] The embodiments will be described in detail with reference to the drawings.

[0022] The embodiments and modifications described below are all inclusive or specific examples. The shapes, materials, components, configuration positions of components, and connection forms shown in the following embodiments are examples and are not intended to limit the present disclosure. In addition, components of the following embodiments that are not described in the independent claims are described as arbitrary components.

[0023] In addition, each figure is a schematic diagram and does not necessarily illustrate the exact structure. In addition, in each figure, the same reference numerals are attached to substantially the same structure.

[0024] In addition, in this specification, words indicating the relationship between elements such as "same" and "parallel" and words indicating the shape of elements such as "concave shape" are not expressions with strict meanings, but also refer to expressions that also include substantially the same range, such as differences of several percent.

[0025] In this specification, the terms "above" and "below" do not refer to absolute spatial positions. Instead, they are used to define the relative positional relationship between the display medium and the display unit. Unless otherwise specified, "above" refers to the display medium side of the display medium and the display unit, and "below" refers to the display unit side of the display medium and the display unit.

[0026] (Implementation Method)

[0027] [1. Structure of the head-up display]

[0028] First, the structure of the head-up display 10 according to the embodiment will be described. Figure 1 , the head-up display 10 is schematically shown cut along a cross section passing through the display medium 11 and along the vertical direction as viewed from the driver's eyes (not shown).

[0029] like Figure 1 As shown, the head-up display 10 of this embodiment is mounted on a vehicle and is used to form a virtual image. This virtual image is visually recognized by the driver of the vehicle, for example, by being present on the front and outer sides of the vehicle. The head-up display 10 is mounted so as to be embedded in the vehicle's instrument panel. The driver is an example of an observer who visually recognizes the virtual image of the head-up display 10.

[0030] The head-up display 10 includes a housing 12 , a display unit 13 , and a projection optical system. A virtual image formed by the head-up display 10 is projected onto a display medium 11 . The display unit 13 and the projection optical system are housed in the housing 12 .

[0031] The display medium 11 allows the driver to visually recognize a virtual image that is projected and overlaps with the scenery being viewed through the display medium 11. The display medium 11 is a light-transmitting member and is implemented, for example, by a windshield or a combiner. In this embodiment, an example in which the display medium 11 is a windshield is described.

[0032] The housing 12 houses the display unit 13 and the projection optical system. The housing 12 is, for example, a resin molded product and is positioned within the vehicle's instrument panel. Furthermore, the housing 12 has an opening formed therein for transmitting display light projected from the projection optical system toward the display medium 11. The opening is covered with a cover such as a transparent resin sheet.

[0033] The display unit 13 is used to display an image that the driver visually recognizes as a virtual image. The display unit 13 is, for example, an LCD (Liquid Crystal Display). Alternatively, the display unit 13 may be a device other than an LCD, such as an organic light-emitting diode (ELD) or a seven-segment fluorescent display. Furthermore, the display unit 13 may be a projector or a scanning laser. Such a display unit 13 is housed on the bottom side of the housing 12 and displays images toward the upper rear side of the vehicle.

[0034] The projection optical system includes a first reflector 14 and a second reflector 15, which are arranged in the optical path of the windshield from the display unit 13 to the display medium 11. The first reflector 14 is arranged on the opening side of the optical path, and the second reflector 15 is arranged on the display unit 13 side of the optical path. Both the first reflector 14 and the second reflector 15 are arranged at a position above the display unit 13. The display light emitted from the display unit 13 is reflected toward the first reflector 14 by the second reflector 15. The display light reflected by the second reflector 15 is reflected, for example, at the lower front side of the vehicle and guided toward the display medium 11. As a result, when the display medium 11 receives the display light reflected by the first reflector 14, it reflects the display light toward the driver's viewpoint. As a result, the driver can visually recognize objects such as the road, pedestrians, or structures located outside the front of the vehicle, as well as virtual images overlapping with the objects, with the help of the display medium 11.

[0035] The first reflector 14 has a rectangular base 16, and the base 16 is made of a resin molded product formed by injection molding a resin such as polycarbonate, glass, etc. The base 16 is black. The base 16 is not limited to a rectangular shape, but in this embodiment, a rectangular base 16 is used as an example for description. The base 16 has a first surface 17, a second surface 18 which is the back of the first surface 17, and a side surface 19 between the first surface 17 and the second surface 18. A reflective film is provided on the central portion of the first surface 17 of the base 16 to form a reflective surface 20, and a reflective film is not provided on the edge portion 21 outside the reflective surface 20. Here, the edge portion 21 refers to the area surrounding the reflective surface 20 between the central portion of the base 16 where the reflective surface 20 is provided and the outer periphery of the base 16. The reflective surface 20 of the first reflector 14 is concave. The reflective surface 20 of the first reflector 14 can be a spherical surface or an aspherical surface (a free-form surface). The reflecting surface 20 of the first reflecting mirror 14 is not limited to a rectangular shape, but in this embodiment, a rectangular shape is described as an example.

[0036] like Figure 4As shown, the edge portion 21 of the first reflector 14 has a stepped shape that is recessed toward the second surface 18 relative to the reflective surface 20. The edge portion 21 is inclined relative to the reflective surface 20. In this embodiment, the example in which the stepped edge portion 21 is substantially parallel to a tangent plane approximately at the center of the reflective surface 20 is used for description. The phrase "edge portion 21 is substantially parallel to the center of the reflective surface 20" means that the edge portion 21 is substantially parallel to a tangent plane approximately at the center (centroid) of the reflective surface 20.

[0037] Furthermore, a rough surface is provided on the edge portion 21 of the first reflector 14. In other words, the edge portion 21 is embossed to provide fine irregularities on the surface. The rough surface is provided along the entire circumference of the edge portion 21 of the first reflector 14.

[0038] The inner periphery and outer periphery of the edge portion 21 of the first reflector 14 are parallel, and the shortest distance W between any side of the inner periphery and the side of the outer periphery opposite to the same side is the same in any area of the upper, lower, left, and right sides of the edge portion 21. Here, the left-right direction of the first reflector 14 refers to the left-right direction when viewed from the upper surface of the first reflector 14, that is, when viewed from the first surface 17 side when the reflector is mounted on the housing 12. Figure 2 , the up-down, left-right directions in the drawing correspond to the up-down, left-right directions of the first reflector 14. The distance W between the inner periphery and the outer periphery of the edge portion 21 may not be equal in all regions, but may vary depending on the region. For the edge portion 21, the design is facilitated when the distance W between the inner periphery and the outer periphery is equal in the up-down, left-right, and right regions.

[0039] A rib 22 is provided on the back side (second surface 18 side) of the edge portion 21 of the first reflector 14. That is, the rib 22 is provided at a position overlapping with the area of the edge portion 21 formed in a stepped shape and the area formed with a rough surface when viewed from the first surface 17 side. In the present embodiment, the area of the area of the edge portion 21 formed in a stepped shape and the area formed with a rough surface when viewed from the first surface 17 side is equal to the area of the rib 22. A thick-walled portion 23 having a thickness in the direction connecting the first surface 17 and the second surface 18 of the base 16 is provided in a part of the rib 22. A protrusion 24 protruding from the side of the first reflector 14 is provided from the rib 22. In Figure 2 In the embodiment, the ribs 22 are provided on the entire periphery of the edge portion 21, similarly to the rough surface. In the example of the present embodiment, the ribs 22 are formed integrally with the base 16 when the first reflector 14 is formed.

[0040] A support portion 25 is provided on the side surface 19 of the base 16 of the first reflector 14. The first reflector 14 is rotatably supported by the support portion 25 on the housing 12. The support portion 25 is connected to a gear 26, and the gear 26 is rotated by a motor (not shown) as a driving source. The first reflector 14 rotates with a straight line L connecting the two support portions 25 as the rotation axis. The angle of the first reflector 14 is adjusted by the rotation of the motor. In this embodiment, the motor is an example of a driving portion.

[0041] The second reflector 15 includes a rectangular base 16. The base 16 may be made of a resin molded article, glass, or the like, formed by injection molding a resin such as polycarbonate. The base 16 is not limited to a rectangular shape. In this embodiment, a rectangular base 16 is used as an example for description. A reflecting surface 20 is provided on the base 16. The reflecting surface 20 may be, for example, a convex surface. The reflecting surface 20 may also be a flat surface or a concave surface. The reflecting surface 20 of the second reflector 15 may also be a spherical surface or an aspherical surface (a free-form surface). The second reflector 15 is fixed to the housing 12.

[0042] By making the reflective surface 20 of the first reflector 14 concave and the reflective surface 20 of the second reflector 15 convex, a so-called telephoto optical system can be formed. This telephoto optical system increases the refractive power (i.e., the optical power) of the first reflector 14, and the effect of the surface accuracy of the edge 21 of the first reflector 14 on virtual image distortion increases. Therefore, providing the rib 22 on the back side of the edge 21 of the first reflector 14 further enhances its effect.

[0043] [2. Functions and effects of head-up display]

[0044] The operation and effects of the head-up display 10 will be described.

[0045] The first reflector 14 rotates under the action of a motor to adjust the display position of the virtual image. Since stress acts on the first reflector 14 during its rotation, strain occurs in the first reflector 14. In particular, the stress increases as the distance from the rotation axis of the first reflector 14 increases. The greatest stress acts on the edge 21 of the first reflector 14, causing significant strain in the edge 21 of the first reflector 14.

[0046] The first reflector 14 has ribs 22 on its second surface 18, resulting in a higher rigidity at the edge 21 than in a case without ribs 22. Furthermore, the ribs 22 increase the rigidity of the edge 21 of the first reflector 14 compared to the central portion where the reflective surface 20 is located. By increasing the rigidity of the edge 21, the strain on the first reflector 14 caused by rotating it can be reduced. Furthermore, the ribs 22 prevent warping of the first reflector 14.

[0047] During injection molding of the first reflector 14, sink marks form on the edge 21 due to the provision of the ribs 22. If sink marks form on the base 16, the display light reflected by the sink marks may be reflected in unintended directions. This can cause distortion in the virtual image projected from the head-up display 10, degrading image quality. While these sink marks can be corrected under molding conditions, this increases the molding cycle time and significantly reduces productivity.

[0048] The edge portion 21 of the head-up display 10 is formed into a stepped shape. By giving the edge portion 21 a stepped shape, the portion where the sink mark is formed by the rib 22 is set back toward the second surface 18, making the sink mark less noticeable and reducing its impact. While the edge portion 21 becomes thinner when it is formed into a stepped shape, providing the rib 22 on the back side of the edge portion 21 allows the edge portion 21 to be thickened, thereby increasing its rigidity. Furthermore, since the edge portion 21 is inclined relative to the reflective surface 20 along its entire circumference, display light reflected by the edge portion 21 is less likely to be directed toward the display medium 11. Specifically, when the head-up display 10 is mounted in a vehicle, sunlight entering the vehicle from the display medium 11 enters the housing 12 through the opening. Sunlight entering the housing 12 is generally reflected toward the second reflector 15 upon entering the first reflector 14. In particular, at the edge 21 of the first reflector 14, sunlight incident on the edge 21 is reflected toward the second reflector 15, similar to sunlight incident on the reflective surface 20. This makes it prone to repeated reflection in the order of the display unit 13, the second reflector 15, the first reflector 14, and the display medium 11, which easily generates stray light that is visually perceived by the driver. However, when the edge 21 is approximately parallel to the approximate center of the reflective surface 20, the sunlight is reflected in a direction different from that of the reflective surface 20, making it difficult for the sunlight to be reflected toward the second reflector 15. Therefore, by making the edge 21 approximately parallel to the approximate center of the reflective surface 20, it is possible to prevent sunlight reflected from the edge 21 from becoming stray light. Therefore, by forming the edge 21 into a stepped shape and making the left-right and top-down edges 21 approximately parallel to the approximate center of the reflective surface 20, it is possible to reduce the effects of sink marks and the strain caused by the rotation of the first reflector 14 while also reducing the effects of stray light. Furthermore, by forming the edge portion 21 in a stepped shape, a masking jig for the reflective film can be brought into close contact with the stepped shape when forming the reflective film of the first reflector 14 , thereby improving the positional accuracy of the jig.

[0049] By forming the edge portion 21 of the first reflector 14 into a stepped shape and providing the ribs 22 on the back side of the edge portion 21, the rigidity of the edge portion 21 of the first reflector 14 can be increased while also reducing the effects of sink marks generated in the edge portion 21. Consequently, the image quality of the virtual image projected from the head-up display 10 can be improved.

[0050] The head-up display 10 has a rough surface at the edge 21. Display light reflected by the rough surface is diffused and thus has difficulty traveling toward the display medium 11. Therefore, providing the rough surface at the edge 21 can reduce the influence of sink marks generated at the edge 21.

[0051] Furthermore, if a rough surface is provided, the thickness of the portion provided with the rough surface becomes smaller. However, by providing the ribs 22 on the back side of the rough surface, the rigidity of the edge portion 21 can be increased. By increasing the rigidity of the edge portion 21, the edge portion 21 is less likely to be deformed even when the first reflector 14 is rotated.

[0052] Since the first reflector 14 has the rough surface and the ribs 22, the rigidity of the edge 21 of the first reflector 14 can be increased while reducing the influence of sink marks generated at the edge 21. Therefore, the image quality of the virtual image projected from the head-up display 10 can be improved.

[0053] The advantages of the present invention can be achieved by either forming the edge portion 21 into a stepped shape and providing the ribs 22, or forming the edge portion 21 into a roughened surface and providing the ribs 22. Since the edge portion 21 of the first reflector 14 is formed into a stepped shape and provided with a roughened surface, the effect of sink marks on the virtual image distortion caused by the edge portion 21 can be reduced compared to a case where only either the stepped shape or the roughened surface is provided. Consequently, the image quality of the virtual image projected from the head-up display 10 can be improved compared to either a case where the edge portion 21 is formed into a stepped shape or a case where the edge portion 21 is provided with a roughened surface.

[0054] All areas of the edge portion 21, including the upper, lower, left, and right sides, are formed into a stepped shape and have a rough surface. That is, the stepped shape and the rough surface are formed along the entire periphery of the edge portion 21. Accordingly, the ribs 22 are also provided along the entire periphery of the second surface 18. Since the ribs 22 are provided along the entire periphery, it is possible to improve the rigidity of the entire periphery of the edge portion 21 of the first reflector 14 while also reducing the effect of shrinkage marks on the distortion of the virtual image. Compared with the case where the stepped shape and the rough surface are only formed on a part of the edge portion 21, the effect of the present invention can be more effectively achieved. In particular, by forming the ribs 22 on the edge portion 21 (the area in the upper and lower directions) farther from the rotation axis of the first reflector 14, the stress generated when the first reflector 14 rotates can be effectively reduced.

[0055] Furthermore, the base 16 of the first reflector 14 is black. The base 16 can be coated with a black paint or formed from a black material. By making the base 16 black, the reflection of visible light can be reduced, thereby reducing the reflection of display light by the edge 21. This further minimizes the effects of sink marks. The color of the base 16 is not limited to black; colors with a low visible light reflectivity are effective. However, by making it black, the reflection of visible light can be significantly reduced.

[0056] The thickness of the rib 22 can be set to a thickness that allows the rigidity of the edge portion 21 to be higher than that of the central portion of the base 16. Furthermore, the provision of the rib 22 also allows the resonance frequency of the first reflector 14 to be adjusted. Adjusting the resonance frequency of the first reflector 14 can counteract vibrations generated by the vehicle equipped with the head-up display 10.

[0057] The effects of the present invention can be achieved as long as the ribs 22 are formed so as to partially overlap the back side of the region of the edge portion 21 where the stepped shape and rough surface are formed when viewed from the first surface 17. In this embodiment, the ribs 22 are formed so as to overlap the entire surface of the stepped shape and rough surface when viewed from the first surface 17. As a result, the rigidity of all regions of the edge portion 21 is higher than that of the central portion of the base 16.

[0058] A thick-walled portion 23 is formed on the rib 22. By providing the thick-walled portion 23 on the rib 22, it is easy to adjust the resonance frequency of the first reflector 14. This makes it easy to implement vibration countermeasures. In addition, by providing the thick-walled portion 23 of the rib 22 at the edge portion 21 at a position farther from the rotation axis of the first reflector 14, the stress when the first reflector 14 is rotated can be reduced to a large extent. In this way, the strain of the first reflector 14 caused by the rotation of the first reflector 14 can be reduced. Figure 2 and Figure 3 In FIG, the thick portion 23 is provided on the lower right side of the first reflecting mirror 14 , but the position where the thick portion 23 is provided can be changed as appropriate.

[0059] A protrusion 24 that protrudes in the direction of the side surface 19 is provided on the side surface 19 of the first reflector 14. By providing the protrusion 24, the resonance frequency of the first reflector 14 can be easily adjusted. This makes it easy to implement vibration countermeasures. Figure 2 and Figure 3 In FIG. 1 , the protrusion 24 is provided on the lower right side of the first reflecting mirror 14 , but the position where the protrusion 24 is provided can be changed as appropriate.

[0060] A groove may be provided in a portion of the side surface 19 of the first reflector 14 including the rib 22. Providing the groove in the side surface 19 of the first reflector 14 also allows adjustment of the resonance frequency of the first reflector 14. The groove may be provided during mold fabrication or through secondary processing after injection molding.

[0061] Furthermore, although the head-up display 10 including the second reflector 15 has been described as an example, the head-up display 10 may be configured without the second reflector 15. If the head-up display 10 is configured without the second reflector 15, the head-up display 10 can be miniaturized.

[0062] (Variation)

[0063] While the head-up display of the present disclosure has been described above based on the aforementioned embodiments, the present disclosure is not limited to the aforementioned embodiments. For example, various modifications that would be conceivable to a person skilled in the art to the various embodiments, as well as arbitrary combinations of the components and functions of the various embodiments without departing from the spirit of the present disclosure, are also encompassed by the present disclosure.

[0064] In the above embodiment, the case where the area of the region where the step shape and the rough surface are formed on the edge portion 21 is equal to the area of the rib 22 when viewed from the first surface 17 is described as an example, but the present invention is not limited to this. As long as the area of the rib 22 is smaller than the area of the region where the step shape and the rough surface are formed on the edge portion 21 when viewed from the first surface 17, the head-up display 10 can be miniaturized. This example is shown in FIG. Figure 5 . Figure 5 1 shows the first reflector 14 viewed from the first surface 17 side. The dotted line D shows the outer periphery of the rib 22. Figure 5 The rib 22 is formed so that the entire rib 22 is located inside the region of the edge portion 21 where the step shape and the rough surface are formed when viewed from the first surface 17 side.

[0065] In the above embodiment, the upper edge portion 21 of the first reflector 14 is formed to be substantially parallel to the center of the reflective surface 20 and tilted relative to the tilt direction of the reflective surface 20. However, the present invention is not limited to this. The upper edge portion 21 of the first reflector 14 may be tilted in the same direction as the tilt direction of the reflective surface 20. Figure 2 In FIG. 1 , the upper edge portion 21 is represented by a region R surrounded by a dotted line. Figure 6 , region R is located on the left side in the drawing. Figure 6 The first reflector 14 of the modified example Figure 2 The cross-sectional view of the position of the AA line. Figure 6, the upper edge portion 30 shown in region R of the edge portion 30 is arranged close to the display medium 11. Only the region R on one side of the edge portion 30 close to the display medium 11 is formed parallel to the reflective surface, and the remaining lower and left and right edges 30 are inclined relative to the reflective surface 20.

[0066] In the above embodiment, the projection optical system is described as having two reflectors, the first reflector 14 and the second reflector 15, but the present invention is not limited thereto. The projection optical system may also be composed of one reflector or may have three or more reflectors. In addition, the projection optical system may also include a lens. Figure 7 A schematic diagram of a head-up display 31 in which a projection optical system is formed by a single reflecting mirror is shown.

[0067] The projection optical system includes a first reflector 14 positioned in the optical path from the display unit 13 to the windshield of the display medium 11. The first reflector 14 is positioned above the display unit 13. Display light reflected by the first reflector 14 is directed to the display medium 11. Upon receiving the display light reflected by the first reflector 14, the display medium 11 reflects the display light toward the driver's viewpoint. This allows the driver to visually recognize objects such as the road, pedestrians, or structures located outside the vehicle's front, as well as virtual images superimposed on these objects, through the display medium 11.

[0068] Since the projection optical system of the head-up display 10 is constituted by only the first reflecting mirror 14 , the head-up display 31 can be miniaturized compared to the above-described embodiment in which the projection optical system is constituted by two reflecting mirrors.

[0069] Industrial applicability

[0070] The present disclosure can be applied to, for example, a head-up display mounted on a vehicle or the like.

[0071] Description of Reference Numerals

[0072] 10. 31. Head-up display; 11. Display medium; 12. Housing; 13. Display portion; 14. First reflector; 15. Second reflector; 16. Base; 17. First surface; 18. Second surface; 19. Side surface; 20. Reflecting surface; 21. 30. Edge portion; 22. Rib; 23. Thick-walled portion; 24. Protrusion; 25. Support portion; 26. Gear.

Claims

1. A head-up display that projects a virtual image onto a display medium, wherein: The head-up display includes: a display unit that emits display light to become a display image; and a first reflecting mirror for guiding the image displayed by the display unit toward the display medium to form a virtual image on the side of the display medium opposite to the observer; The first reflector includes a base body and a reflective surface. The base body includes a first surface and a second surface that is a back surface of the first surface. The reflective surface is provided on the first surface. The base has an edge portion with a rough surface between the reflective surface of the first surface and the outer periphery of the base, and a rib is provided on the back side of the edge portion. The head-up display includes a protrusion that protrudes from the rib in a direction perpendicular to a direction connecting the first surface and the second surface of the base of the first reflector.

2. The head-up display according to claim 1, wherein: The edge portion is formed along the entire periphery of the base body. The rough surface is provided on the entire surface of the edge portion.

3. The head-up display according to claim 1, wherein: The ribs are provided on the entire back side of the rough surface.

4. The head-up display according to claim 1, wherein: The edge portion has a stepped shape that recedes in a direction from the first surface toward the second surface.

5. The head-up display according to claim 4, wherein: The region of the edge portion formed in the step shape, which is close to the display medium, is formed parallel to the reflective surface, and the remaining region is inclined with respect to the reflective surface.

6. The head-up display according to claim 1, wherein: The rib has a thick-walled portion that is thicker than other portions of the rib.

7. The head-up display according to claim 1, wherein: The head-up display further includes a driving unit for driving the first reflecting mirror to rotate. The first reflecting mirror is rotatably supported by the driving portion via a supporting portion provided on the base.

8. The head-up display according to any one of claims 1 to 7, wherein: The head-up display further includes a second reflecting mirror between the display unit and the first reflecting mirror, the second reflecting mirror reflecting display light emitted from the display unit toward the first reflecting mirror.

9. The head-up display according to claim 8, wherein: The first reflecting mirror is a concave mirror, and the second reflecting mirror is a convex mirror.

10. A head-up display that projects a virtual image onto a display medium, wherein: The head-up display includes: a display unit that emits display light to become a display image; and a first reflecting mirror for guiding the image displayed by the display unit toward the display medium to form a virtual image on the side of the display medium opposite to the observer; The first reflector includes a base body and a reflective surface. The base body includes a first surface and a second surface that is a back surface of the first surface. The reflective surface is provided on the first surface. The base has an edge portion formed in a stepped shape between the reflective surface of the first surface and the outer periphery of the base, and a rib is provided on the back side of the edge portion. The head-up display includes a protrusion that protrudes from the rib in a direction perpendicular to a direction connecting the first surface and the second surface of the base of the first reflector.

Images