Mirror and head-up display device

Abstract

In this mirror and head-up display device, the mirror (20) reflects display light (L) and has a curved reflection surface (20a). A mirror (20) is provided with: a substrate (21) having a curved adhesive surface (26a); a mirror film (40) that forms a reflective curved surface (20a) in a state in which the mirror film is adhered to the adhesive surface (26a); and reference protrusions (24a, 24b, 24c) formed so as to protrude around the base material (21). Each of the reference protrusions (24a, 24b, 24c) is provided with an upper surface (24U) and a side surface (24S). The upper surfaces (24U) of the reference protrusions (24a, 24b) are located on the same plane (Pxz). The side surfaces (24S) of the reference protrusions (24a, 24c) are located on the same plane (Pyz). The planes (Pxz, Pyz) are imaginary planes that are orthogonal to each other. The mirror and the head-up display device according to the present invention can be manufactured more simply with high shape accuracy.

Description

Technical Field

[0001] This invention relates to a reflector and a head-up display device. Background Technology

[0002] The head-up display device described in Patent Document 1 includes an illumination device, a display that is illuminated by the illumination device and emits display light, and a reflector that reflects the display light. The reflector has a reflective layer bonded to a substrate, which is a reflective polarization multilayer film that reflects only a specific polarization component of visible light. This reflective polarization multilayer film allows infrared light from external light, such as sunlight, to pass through, preventing it from reaching the TFT panel unit, thereby improving the heat resistance of the head-up display device.

[0003] The head-up display device described in Patent Document 2 includes a first reflecting mirror that reflects display light emitted from the display in a manner that refracts it toward a second reflecting mirror. The reflecting mirror has a reflective surface with a curvature that causes the reflected display light to cross vertically before reaching the second reflecting mirror.

[0004] Existing technical documents

[0005] Patent documents

[0006] Patent Document 1: International Publication No. 2020 / 246546

[0007] Patent Document 2: Japanese Patent Application Publication No. 2016-103008 Summary of the Invention

[0008] The technical problem that the invention aims to solve

[0009] The reflective polarizing multilayer film described in Patent Document 1 is generally formed on a flat surface of a substrate by vapor deposition. However, as described in Patent Document 2, it is difficult to form a reflective polarizing multilayer film with high shape accuracy on a curved surface by vapor deposition, and there is a need for a simpler and more accurate method to manufacture reflective polarizing multilayer films.

[0010] The present invention was made in view of the above-mentioned actual situation, and its object is to provide a reflector and head-up display device that can be manufactured more simply and with high shape accuracy.

[0011] Technical solutions adopted to solve technical problems

[0012] To achieve the above objectives, the reflector described in the first aspect of the present invention is a reflector having a reflective surface that reflects display light.

[0013] The reflector comprises: a substrate having a curved adhesive surface;

[0014] A reflective film, which forms the reflective surface when bonded to the adhesive surface; and

[0015] The first to third reference protrusions are formed protrudingly around the substrate.

[0016] The first to third reference protrusions each have a first and a second surface.

[0017] The first surfaces of the first and second reference protrusions are located on the same first plane.

[0018] The second surfaces of the first and third reference protrusions are each located on the same second plane.

[0019] The first and second planes are imaginary planes that are orthogonal to each other.

[0020] To achieve the above objective, a head-up display device according to a second aspect of the present invention includes the reflector and a display device for emitting the display light toward the reflector.

[0021] Invention Effects

[0022] According to the present invention, the mirror and head-up display device can be manufactured more simply and with higher shape accuracy. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of a vehicle equipped with a head-up display device according to one embodiment of the present invention.

[0024] Figure 2 This is a schematic diagram illustrating the structure of a head-up display device according to one embodiment of the present invention.

[0025] Figure 3 This is a perspective view of a reflector according to one embodiment of the present invention.

[0026] Figure 4 This is a front view of a reflector according to one embodiment of the present invention.

[0027] Figure 5 This is a side view of a reflector according to one embodiment of the present invention.

[0028] Figure 6 This is a perspective view of a reflector according to one embodiment of the present invention.

[0029] Figure 7 This is a cross-sectional view of the reflective film, the substrate body, and the transparent adhesive layer according to one embodiment of the present invention.

[0030] Figure 8This is a perspective view of a substrate for a reflector marked with contour lines, according to one embodiment of the present invention.

[0031] Figure 9 This is a perspective view of a mirror according to a variation of the present invention. Detailed Implementation

[0032] The reflector and head-up display device according to one embodiment of the present invention will be described with reference to the accompanying drawings.

[0033] like Figure 1 As shown, a head-up display 100 is installed inside the dashboard of a vehicle 200. The head-up display 100 emits display light L representing an image toward the windshield 201, which is an example of a projection component of the vehicle 200. The display light L is reflected by the windshield 201 and reaches a visual observer 1 (mainly the driver of the vehicle 200). Thus, the head-up display 100 displays a virtual image V in a manner that overlaps with the real scene seen through the windshield 201.

[0034] like Figure 2 As shown, the head-up display device 100 includes a display device 10, a reflector 20, a concave mirror 30, a mirror drive mechanism 35, and a frame 60.

[0035] The display device 10 emits display light L under the control of a control unit (not shown). The display device 10 includes a TFT (Thin Film Transistor) liquid crystal display panel 11 and a backlight 12 for illuminating the liquid crystal display panel 11.

[0036] The display device 10 with display panel 11 has lower heat resistance compared to types with OLED (Organic Light-Emitting Diode) or types that display images on a transmissive screen by receiving reflected light from a DMD (Digital Micromirror Device). Therefore, in the display device 10 with display panel 11, it is particularly necessary to suppress the temperature rise of display panel 11 by means of the reflective film 40 described later.

[0037] The concave mirror 30 amplifies and reflects the display light L reflected by the reflector 20 toward the windshield 201.

[0038] The mirror drive mechanism 35 is configured to rotate the concave mirror 30 about a rotation axis J extending along the vehicle width direction. By rotating the concave mirror 30 about the rotation axis J, the illumination position of the display light L for the visual observer 1 is adjusted in the height direction.

[0039] The frame 60 is made of opaque resin or metal and is a hollow, roughly rectangular prism. The frame 60 houses a reflector 20, a concave mirror 30, and a mirror drive mechanism 35.

[0040] The frame 60 has an opening 61a at a position opposite to the windshield 201. The frame 60 has a curved, plate-shaped window 50 that closes the opening 61a. The window 50 is made of a light-transmitting resin material such as acrylic for the display light L to pass through.

[0041] The frame 60 has a mirror bracket (not shown) that houses the fixed portions 22L, 22R, and 22C of the mirror 20 (described later). With the fixed portions 22L, 22R, and 22C of the mirror 20 housed in the mirror bracket, the fixed portions 22L, 22R, and 22C are secured by applying force using a leaf spring (not shown).

[0042] The reflector 20 is configured as a correction mirror with a reflective polarizing mirror film (cold reflector film) and has a reflective surface 20a formed by a freeform surface. The reflector 20 reflects the display light L from the display device 10 toward the concave mirror 30. The reflector 20 is in the shape of a generally rectangular plate.

[0043] The reflective surface 20a faces forward and downward towards the vehicle. The reflector 20 has a curvature (the reciprocal of the radius of curvature) that causes the reflected display light L to intersect vertically at a point CP before reaching the concave mirror 30. The reflector 20 has a curvature that places the focal point of the reflector 20 within the optical path between the reflector 20 and the concave mirror 30. In other words, the distance from the reflector 20 to the concave mirror 30 is set to be longer than the focal length of the reflector 20. The point CP is located closer to the reflector 20 than the center of the optical path between the reflector 20 and the concave mirror 30.

[0044] Furthermore, the intersection point CP can be located at the central position or at a position closer to the concave mirror 30 than the central position.

[0045] like Figure 3 and Figure 4 As shown, the reflector 20 includes a substrate 21 and a visible polarized light reflector film 40. The substrate 21 includes a substrate body 26, a plurality of fixed portions 22L, 22R, 22C, a plurality of reference protrusions 24a, 24b, 24c, and a plurality of pressed portions 25a, 25b, 25c, 25d.

[0046] In the following description, the direction of the long side of the reflector 20 is the X direction, the direction of the short side of the reflector 20 is the Y direction, and the direction of the thickness of the reflector 20 is the Z direction. The X direction is the direction corresponding to the left and right direction of the virtual image V when viewed by visual observer 1, i.e., the vehicle width direction; the Y direction is the direction corresponding to the up and down direction of the virtual image V when viewed by visual observer 1; and the Z direction is the direction corresponding to the depth direction of the virtual image V when viewed by visual observer 1.

[0047] In the following description, left and right are defined as the directions when viewing the reflecting surface 20a of the mirror 20 from the front.

[0048] The substrate 21 is integrally formed from a translucent synthetic resin. The substrate 21 is formed by injection molding.

[0049] The substrate body 26 is a curved plate shape that is longer in the X direction and shorter in the Y direction. The surface of the substrate 21 (the surface on the side of the reflective curved surface 20a) is the adhesive surface 26a to which the reflective film 40 is adhered. The adhesive surface 26a is a convex curved surface in the X direction and a concave curved surface in the Y direction. At both ends of the adhesive surface 26a in the X direction, the height of the surface decreases, and as it approaches the center in the X direction, the height of the surface gradually increases. At one end of the adhesive surface 26a in the Y direction ( Figure 3 At the end in the +Y direction, the surface height is highest, decreasing as it approaches the other end in the Y direction ( Figure 3 (At the end in the -Y direction), the height of the surface gradually decreases.

[0050] When viewed from the front, the adhesive surface 26a is roughly rectangular, longer in the X direction and shorter in the Y direction. The X-direction of the lower side surface of the adhesive surface 26a is located on the exterior side of the vehicle body (Xo). Figure 4 An inclined edge 21b is formed on the right side of the vehicle. The orientation of the exterior Xo of the vehicle is defined by the view from the visual observer 1 located in the driver's seat. The inclined edge 21b is inclined upward towards the exterior Xo of the vehicle and extends between the lower side and the right side of the base body 26. The inclined edge 21b forms a shape that cuts off the lower part of the exterior Xo of the reflector 20, thereby suppressing interference between the reflector 20 and other components (pipes, etc.) in the vehicle's dashboard.

[0051] The fixing portions 22L and 22R are located on the left and right sides of the substrate body 26, respectively, and are generally cylindrical in shape extending along the X direction. These left and right sides are located on opposite sides of the substrate 21 in the X direction and are sides extending in the Y direction. The fixing portions 22L and 22R are located at the upper ends of each of these left and right sides and are arranged coaxially.

[0052] The fixed portion 22C is located on the lower side surface of the base material 21 and is generally spherical. This lower side surface is a side surface that extends along the X direction. The fixed portion 22C is located at a position closer to the interior side Xi of the vehicle than the center of the lower side surface in the X direction.

[0053] The fixing parts 22L, 22R, and 22C are inserted into a reflector bracket (not shown) and held in place by a leaf spring (not shown).

[0054] like Figure 7 As shown, the reflective film 40 is bonded to the bonding surface 26a of the substrate body 26 via a transparent adhesive layer 49. The transparent adhesive layer 49 is a transparent optical adhesive layer, such as OCA (Optically Clear Adhesive) or OCA (Optically Clear Resin).

[0055] The reflective film 40 is a reflective polarizing multilayer film. A reflective polarizing multilayer film is a film made by stacking hundreds of layers of polyester resin films with different refractive indices.

[0056] The reflective film 40 adjusts the refractive index of each film in a manner that reflects only a specific polarization component of visible light A. The reflective film 40 has wavelength selectivity relative to the reflected wavelength. In S-polarized light, the reflectivity is, for example, less than 20% for wavelengths from 780 nm to 2500 nm, more preferably less than 10%, for example, about 5%, and the reflectivity is, for example, more than 80% for wavelengths from 450 nm to 650 nm, more preferably more than 90%, for example, 95%.

[0057] The reflective film 40 allows a portion of visible light A2 and infrared light B to pass through without reflection. Light A2 and infrared light B pass through the translucent substrate body 26 and reach the frame 60. Therefore, the absorption of light A2 and infrared light B in the substrate body 26 is suppressed, and the temperature of the substrate 21 is less likely to rise compared to the black resin substrate. Thus, it is possible to prevent the reflective film 40 from peeling off from the substrate 21 as the temperature rises.

[0058] In detail, the reflective film 40 has a reflection axis, reflecting visible light A in the direction of the reflection axis ( Figure 4 The reflective mirror film 40 is configured such that the polarization direction of the display light L emitted from the display panel 11 is approximately parallel to the direction of the reflection axis of the reflective mirror film 40. The reflective mirror film 40 allows the linearly polarized component A2 of the visible light A, which is perpendicular to the direction of the reflection axis, to pass through without reflection.

[0059] In this way, by configuring the reflective film 40, a portion of external light such as sunlight (light A2 in visible light A and infrared light B) directed toward the display panel 11 can be reduced. Therefore, the temperature rise of the display panel 11 can be suppressed, and the attenuation of the display light L from the display panel 11 can be suppressed to achieve reflection.

[0060] The reflective film 40 is in the form of a flexible sheet. Before being adhered to the adhesive surface 26a, the reflective film 40 is flat, and when adhered to the adhesive surface 26a, it has a curved shape along the adhesive surface 26a. The reflective film 40 is formed with an area smaller than the adhesive surface 26a and is located in the center of the adhesive surface 26a.

[0061] The reflective film 40 is curved in a concave manner in the Y direction and in a convex manner in the X direction. The curvature of the reflective film 40 in the Y direction causes the displayed light L to cross vertically at the intersection point CP before reaching the concave mirror 30.

[0062] The absolute value of the average curvature of the reflective film 40 in the Y direction is set to be greater than the absolute value of the average curvature of the reflective film 40 in the X direction.

[0063] like Figure 4 As shown, the reflective film 40 has an upper edge 41U, a lower edge 41D, a left edge 41L, and a right edge 41R as its shape.

[0064] The upper side 41U and the lower side 41D are curved in a U-shape and extend along the X direction. The opening side of the U-shape faces the upper side in the Y direction, that is, the side on which the reflected light travels (+Y side). The upper side 41U and the lower side 41D form a shape in which the valley is deepest in the central part in the X direction, and gradually becomes shallower as the valleys on both outer sides towards the central part in the X direction decrease in depth.

[0065] like Figure 8 As shown, the contour lines LC on the adhesive surface 26a of the substrate body 26, like the upper edge 41U, are bent into a U-shape and extend in the X direction. Each contour line LC is a line connecting points of equal height in the Z direction, such as... Figure 5 As shown, the height is indicated by the tangent plane PL at the point 20p in the reflective surface 20a that contacts the center of the optical axis (central ray) of the display light L. By making at least a portion of the upper edge 41U shaped along the contour line LC, the height difference on the bonding surface 26a is reduced when the upper edge 41U of the reflective film 40 is bonded to the reflective surface 20a, making the bonding of the reflective film 40 easier.

[0066] like Figure 4 As shown, an inclined edge 41E is formed at the right end of the lower edge 41D along the inclined edge 21b described above.

[0067] The left side 41L extends downward from the left end of the upper side 41U and bends to connect with the left end of the lower side 41D.

[0068] The right side 41R extends downward from the right end of the upper side 41U and bends to connect with the right end of the inclined side 41E.

[0069] The upper part 41U has three straight sections 42a, 42b, and 42c, and the lower part 41D has one straight section 42d. Each straight section 42a to 42d extends in a straight line along the X direction (the direction of the long side of the mirror film 40) when the mirror film 40 is not adhered to the adhesive surface 26a and is in a flat state. Each straight section 42a to 42d is used for positioning when the mirror film 40 is adhered to the adhesive surface 26a.

[0070] Straight section 42a is located at the left end of the upper part 41U. Straight section 42b is located at the right end of the upper part 41U. Straight section 42c is located at the center of the upper part 41U in the X direction. The straight sections 42a, 42b, and 42c are connected by curves.

[0071] The straight section 42c is located in the Y direction closer to the center point O (near the lower side) of the reflective film 40 than the straight sections 42a and 42b. The length of the straight section 42c is set to be shorter than the length of the straight sections 42a and 42b. In this way, by arranging the straight sections 42a, 42b, and 42c in a mutually parallel and stepped position, the dimensional measurement accuracy of the reflective film 40 can be improved.

[0072] The straight section 42d is located at the center of the lower section 41D in the X direction. The length of the straight section 42d is longer than that of each of the straight sections 42a, 42b, and 42c.

[0073] The reflective film 40 has a U-shaped curved shape (a roughly curved rectangle) in the X direction. This curved shape of the reflective film 40 is the result of a distortion process performed to eliminate the distortion of the virtual image V of the image displayed on the display panel 11. As a result, the usable area occupied by the reflective film 40 can be increased.

[0074] like Figure 4 and Figure 5 As shown, the reflective film 40 reflects the display light L from the display panel 11 side, i.e., the display light arrival side (-Y side), toward the concave mirror 30 toward the +Z side of the reflected light travel. The reflective film 40 is configured such that the U-shaped opening side faces the reflected light travel side (+Y side).

[0075] A reflective surface 20a is formed on the surface of the reflective film 40 (the surface opposite to the substrate 21). For example... Figure 3As shown, the display light L from the display panel 11 is incident on the incident range Ar in the reflective surface 20a. The incident range Ar is formed in a region with a certain blank space BL at a distance from the outer shape of the reflective film 40. The incident range Ar has a shape similar to the outer shape of the reflective film 40. The blank space BL is formed with a length that is larger than the intended positional offset of the incident range Ar.

[0076] Multiple (three) reference protrusions 24a, 24b, 24c are formed in a cuboid shape on the side of the substrate 21.

[0077] Reference protrusions 24a and 24b are located on both sides of the upper side surface of the substrate 21 in the X direction. When viewed from the X direction, the two reference protrusions 24a and 24b are located in an overlapping position.

[0078] like Figure 4 As shown, the upper surfaces 24U of the two reference protrusions 24a and 24b are located on the same plane Pxz extending along the XZ plane.

[0079] The reference protrusion 24c is located on the lower side of the substrate 21 and is positioned at a position overlapping with the reference protrusion 24a when viewed from the Y direction.

[0080] The side surfaces 24S of the reference protrusions 24a and 24c, which extend along the Y direction, are located on the same plane Pyz extending along the YZ plane.

[0081] like Figure 5 As shown, the back surfaces 24B of the reference protrusions 24a, 24b, and 24c are located on the same plane Pxy extending along the XY plane. Plane Pxy is the same plane as the tangent plane PL.

[0082] Here, when the reflector film 40 is pasted onto the pasting surface 26a of the substrate body 26, or when the shape of the reflective surface 20a of the reflector 20 is measured, the substrate 21 is held by a retaining clamp (not shown) via reference protrusions 24a, 24b, and 24c.

[0083] like Figure 4 As shown, the first holding part J1 in the holding fixture is brought into contact with the upper surface 24U of the reference protrusions 24a and 24b, respectively. Thus, the substrate 21 is positioned with high precision in the Y direction by the holding fixture.

[0084] Furthermore, the second holding portion J2 in the holding fixture is brought into contact with the side surfaces 24S of the reference protrusions 24a and 24c, respectively. Thus, the substrate 21 is positioned with high precision in the X direction by the holding fixture.

[0085] In addition, such as Figure 5As shown, the third holding part J3 in the holding fixture is brought into contact with the back surface 24B of each of the reference protrusions 24a, 24b, and 24c. Thus, the substrate 21 is positioned with high precision in the Z direction by the holding fixture.

[0086] Furthermore, the second retaining portion J2 may also contact the side surface of the reference protrusions 24a and 24c opposite to the side surface 24S. Additionally, the third retaining portion J3 may also contact the front surface of each of the reference protrusions 24a, 24b, and 24c. Furthermore, the third retaining portion J3 may also contact the back surface 24B or the front surface of two of the three reference protrusions 24a, 24b, and 24c.

[0087] The reference protrusion 24c is located on the lower side of the substrate 21, closer to the interior side Xi in the X direction than the center. Specifically, the reference protrusion 24c is located at the end of the interior side Xi on the lower side of the substrate 21. The interior side Xi is on the right side from the driver's perspective in a left-hand drive vehicle, and on the left side from the driver's perspective in a right-hand drive vehicle. Since the interior side Xi has more space than the exterior side Xo, the reference protrusion 24c is formed on the interior side Xi.

[0088] like Figure 6 As shown, multiple pressed portions 25a to 25d are formed as cuboids around the substrate 21.

[0089] The multiple pressed portions 25a to 25d are the areas pressed by the ejector pin Ep during injection molding. A circular mark Ea of the ejector pin Ep is formed on the back side of each pressed portion 25a to 25d.

[0090] The pressed part 25a is located at the root of the fixed part 22R on the right side of the substrate 21.

[0091] The pressed part 25a is a cuboid that is longer in the Y direction.

[0092] The pressed part 25b is located at the root of the fixed part 22L on the left side of the substrate 21.

[0093] The pressed portion 25b is a cuboid that extends in the Y direction. The pressed portion 25c is located at the root of the fixed portion 22C on the lower side of the substrate 21.

[0094] The pressed part 25c is a cuboid that is longer in the X direction.

[0095] The pressed portion 25d is located on the lower side of the substrate 21 and is a cuboid that is longer in the X direction. The pressed portion 25d is positioned separately from the fixed portions 22L, 22R, and 22C.

[0096] In addition, the pressed portions 25a to 25d can also be held by the retaining clamp in the same way as the reference protrusions 24a, 24b, and 24c.

[0097] (Effect)

[0098] According to one implementation method described above, the following effects are achieved.

[0099] (1-1) The reflector 20 has a reflective surface 20a that reflects the display light L. The reflector 20 includes: a substrate 21 having a curved adhesive surface 26a; and a reflector film 40, which forms the reflective surface 20a when bonded to the adhesive surface 26a, reflects the polarization component of the visible light A corresponding to the display light L, and allows infrared light B to be transmitted.

[0100] According to this structure, the reflector 20 can be easily manufactured by attaching the reflector film 40 to the curved adhesive surface 26a.

[0101] In addition, the properties of the reflective film 40 can suppress the reflection of unwanted external light onto the display panel 11 and suppress the temperature rise of the display panel 11.

[0102] (1-2) The substrate 21 is formed of a transparent synthetic resin.

[0103] According to this structure, it is possible to suppress the situation where light transmitted through the reflective film 40 is absorbed by the substrate 21. Therefore, it is possible to suppress the temperature rise of the substrate 21 and suppress the peeling of the reflective film 40 from the adhesive surface 26a.

[0104] Furthermore, when the substrate 21 is made of glass, it is difficult to form the adhesive surface 26a into a curved surface. However, since synthetic resin can achieve a soft shape through injection molding, it is easy to form the adhesive surface 26a into a curved surface.

[0105] (1-3) The reflective surface 20a is a convex surface in the X direction, which is an example of a first direction, and a concave surface in the Y direction, which is an example of a second direction. The reflective film 40 has a U-shaped shape that is curved in the X direction.

[0106] Based on this structure, it becomes simple to attach the reflective film 40 to the reflective surface 20a. In particular, when attaching the reflective film 40, wrinkles are less likely to form in the central part of the reflective film 40 in the X direction, resulting in excellent manufacturability.

[0107] (1-4) The reference plane is the tangent plane PL in the reflective surface 20a that contacts the location 20p corresponding to the center of the optical axis of the display light L. When a contour line LC representing the height relative to the tangent plane PL is drawn on the reflective surface 20a, at least a portion of the upper edge 41U of the shape of the reflective film 40 extends along a portion of the contour line LC.

[0108] According to this structure, since a portion of the reflective film 40 is pasted along the contour line LC, it becomes simple to paste the reflective film 40 onto the reflective surface 20a.

[0109] (1-5) An incident range Ar is formed on the reflective surface 20a for the display light L to be incident upon.

[0110] The reflective film 40 is shaped to leave a certain blank space BL around the incident range Ar.

[0111] According to this structure, the reflective film 40 has a shape corresponding to the incident range Ar, thus preventing the reflective film 40 from unnecessarily increasing in size.

[0112] (1-6) The reflector 20 reflects the light L in the Y direction on the side (+Y side) where the reflected light travels. The reflector film 40 is shaped to be U-shaped in the X direction, opening towards the side (+Y side) where the reflected light travels.

[0113] According to this structure, the area of ​​the reflective film 40 can be used more effectively as a reflective region.

[0114] (1-7) The reflective film 40 has an upper side 41U, which is an example of a first side extending side-by-side in the X direction, and a lower side 41D, which is an example of a second side. The upper side 41U has two straight portions 42a and 42b, which are examples of first straight portions, located at both ends in the X direction. The lower side 41D has a straight portion 42d, which is an example of a second straight portion, located at the center in the X direction. When the reflective film 40 is peeled off from the adhesive surface 26a and becomes flat, the straight portions 42a, 42b, and 42d are formed as straight lines extending in the long side direction (X direction) of the reflective film 40.

[0115] According to this structure, the reflector film 40 can be attached to the adhesive surface 26a with high positioning accuracy using the straight sections 42a, 42b, and 42d.

[0116] (1-8) The reflective film 40 has an upper side 41U and a lower side 41D extending side by side in the X direction. The upper side 41U is shaped to include curved sections and straight sections 42a, 42b, and 42c. The curved section is positioned between two straight sections 42a to 42c, which are offset from each other in the Y direction orthogonal to the X direction.

[0117] According to this structure, instead of a continuous curve, parallel straight sections 42a, 42b, and 42c of varying heights are formed, thereby improving the accuracy of dimensional measurement. Furthermore, the straight sections 42a, 42b, and 42c can be used to attach the reflective film 40 to the bonding surface 26a with high positioning accuracy.

[0118] (1-9) The head-up display device 100 includes a reflector 20, a display device 10 that emits display light L, and a concave mirror 30 that reflects the display light L reflected by the reflector 20. The reflector 20 causes the reflected display light L to cross in the vertical direction at a crosspoint CP before reaching the concave mirror 30. The crosspoint CP is located closer to the reflector 20 than to the concave mirror 30.

[0119] According to this structure, by bringing the intersection point CP close to the reflector 20, the size of the reflector 20, which is difficult to manufacture, can be reduced.

[0120] (2-1) The reflector 20 reflects the display light L and has a curved reflective surface 20a. The reflector 20 includes: a substrate 21 having a curved adhesive surface 26a; a reflective film 40, which forms the reflective surface 20a when bonded to the adhesive surface 26a; and reference protrusions 24a, 24b, and 24c, which are examples of first to third reference protrusions formed protruding around the substrate 21. The reference protrusions 24a, 24b, and 24c each have an upper surface 24U and a side surface 24S, which are examples of first and second surfaces, respectively. The upper surface 24U of each of the reference protrusions 24a and 24b is located on a plane Pxz, which is an example of the same first plane. The side surface 24S of each of the reference protrusions 24a and 24c is located on a plane Pyz, which is an example of the same second plane. The planes Pxz and Pyz are imaginary planes that are orthogonal to each other.

[0121] The reflector 20 with the reflective surface 20a requires high forming accuracy. However, compared with vapor-deposited reflectors, the reflector 20 with the reflective surface 20a formed by bonding the reflective film 40 is subjected to load due to the bonding of the reflective film 40, and the shape accuracy of the reflective surface 20a may be lower.

[0122] In this respect, according to the above structure, by attaching the reflective film 40 while positioning the substrate 21 using reference protrusions 24a, 24b, and 24c, the shape accuracy of the reflective surface 20a can be improved. Furthermore, in this positioned state, the shape of the reflective surface 20a can be measured with high precision.

[0123] (2-2) The reference protrusion 24c is located on the lower side of the substrate 21 and is located at the center of the vehicle width direction (X direction) of the lower side, closer to the interior side Xi of the vehicle.

[0124] According to this structure, since the interior side Xi in the vehicle width direction has more extra space compared to the exterior side Xo in the vehicle width direction, it is suitable as the location for setting the reference protrusion 24c.

[0125] (2-3) The reference protrusions 24a, 24b, and 24c each have a back surface 24B, which is an example of a third surface. The back surface 24B of each of the reference protrusions 24a, 24b, and 24c is located on a plane Pxy, which is an example of the same third plane. The back surface 24B contains a location 20p in the reflective surface 20a that corresponds to the center of the optical axis of the display light L.

[0126] According to this structure, by attaching the reflective film 40 while the substrate 21 is positioned using reference protrusions 24a, 24b, and 24c, the shape accuracy of the reflective surface 20a can be improved. Furthermore, in this positioned state, the shape of the reflective surface 20a can be measured with high precision.

[0127] (2-4) The reflective film 40 allows a portion of visible light A to be transmitted. The substrate 21 is transparent. The reflective mirror 20 has pressing portions 25a to 25d formed around the substrate 21 and having traces Ea of the ejector pin Ep.

[0128] According to this structure, by forming pressed portions 25a to 25d with traces Ea around the substrate 21, the traces Ea are prevented from being irradiated by visible light A transmitted through the reflective film 40, thus suppressing the generation of stray light.

[0129] In addition, the pressed parts 25a to 25d can also serve as the surfaces placed on the retaining clamp when the reflective film 40 is pasted.

[0130] (2-5) The reflector 20 has fixed portions 22L, 22R, and 22C, which are formed in a convex shape on the side of the substrate 21 and are fixed to a reflector bracket (not shown) as an example of a fixing object. Pressing portions 25a to 25d are formed at the base of the fixed portions 22L, 22R, and 22C.

[0131] According to this structure, even if the pressed parts 25a to 25d are pressed by the ejector pin Ep, the fixed parts 22L, 22R, and 22C disperse the force, so the adhesive surface 26a is difficult to deform, which can improve the accuracy of the reflective surface 20a.

[0132] (Modified Example)

[0133] Furthermore, the above-described embodiments can be implemented in the following ways with appropriate modifications.

[0134] In the above embodiments, the concave mirror 30 may also be omitted.

[0135] In the above embodiments, the mirror drive mechanism 35 may be omitted.

[0136] In the above embodiment, the number or position of the straight sections 42a to 42d can be appropriately changed. Alternatively, the straight sections 42a to 42d can be omitted, and the entire area covering the upper edge 41U and the lower edge 41D can be formed by curves.

[0137] In the above embodiment, the head-up display device 100 is mounted on the vehicle 200, but it can also be mounted on other vehicles such as airplanes and ships. Furthermore, the projection component is not limited to the windshield and can also be a dedicated assembly.

[0138] In the above embodiments, the number, position or shape of the fixed parts 22L, 22R, and 22C can be appropriately changed.

[0139] like Figure 9 As shown, the fixed parts 22L, 22R, and 22C can also be omitted.

[0140] The number, position, or shape of the pressed portions 25a to 25d in the above embodiments can be appropriately changed. Alternatively, the pressed portions 25a to 25d in the above embodiments can be omitted. Alternatively, the pressed portions pressed by the ejector pin Ep can be formed on the back side of the substrate 21 and on the outer peripheral side of the reflective surface 20a.

[0141] In the above embodiments, as long as the substrate 21 is transparent, it is not limited to synthetic resin, but can also be made of glass.

[0142] Alternatively, in the above embodiment, in the substrate 21, only the main body 26 may be formed of a light-transmitting synthetic resin, while the fixed portions 22L, 22R, 22C, the reference protrusions 24a, 24b, 24c, and the pressed portions 25a to 25d may be formed of a light-shielding material. Alternatively, the entire substrate 21 may be formed of a light-shielding material.

[0143] In the above embodiment, the lower side 41D can also be composed of three straight sections 42a to 42c and a curve between the straight sections 42a to 42c, just like the upper side 41U.

[0144] In the above embodiment, the reflective film 40 is U-shaped and curved in the X direction, but it can also be a rectangle that is long in the X direction as long as it includes the incident range Ar.

[0145] In addition, the reflective film 40 is adhered to the central area of ​​the surface of the substrate 21, but it can also be adhered to the entire surface of the substrate 21.

[0146] In the above embodiments, the curved shape of the adhesive surface 26a can be appropriately modified. The reflector 20 forms an intersecting optical path, but it can also be a shape of the reflective surface 20a that does not form an intersecting optical path. In addition, the adhesive surface 26a may also have a concave or convex curved surface only in one of the X and Y directions.

[0147] In the above embodiment, at least a portion of the upper side 41U is shaped along the contour line LC, but at least a portion of the lower side 41D can also be shaped along the contour line LC. Furthermore, at least a portion of both the upper side 41U and the lower side 41D can also be shaped along the contour line LC. That is, in this case, the shape of the reflective film can also be a shape that extends in two directions in a predetermined direction (drum-shaped, hourglass-shaped).

[0148] The reflective film 40 can also be a film other than a reflective or polarizing type.

[0149] In the above embodiments, the display device 10 is of the type that includes a display panel 11, but it is not limited to this. It can be of any type as long as it can emit display light L from the display surface. For example, the display device 10 can be of the type that includes an OLED, or the type that receives reflected light from a DMD and displays an image on a transmissive screen.

[0150] Explanation of reference numerals in the attached figures

[0151] 1…Visual observer; 10…Display device; 11…Display panel; 12…Backlight; 20…Reflector; 20a…Reflective surface; 20p…Location; 21…Substrate; 21b…Sloping edge; 22C, 22L, 22R…Fixed part; 24a, 24b, 24c…Reference protrusion; 24B…Back side; 24S…Side side; 24U…Top surface; 25a~25d…Pressed part; 26…Substrate body; 26a…Adhesive surface; 30…Concave mirror; 35…Mirror drive mechanism; 40…Reflector film; 41U…Top; 41D…Bottom; 41L…Left side; 41R…Right side; 41E …sloping edge; 42a~42d…straight section; 49…transparent adhesive layer; 50…window section; 60…frame; 61a…opening; 100…head-up display; 200…vehicle; 201…windshield; A…visible light; A1, A2…light; B…infrared light; J…rotation axis; J1~J3…first~third holding section; L…display light; O…center point; V…virtual image; BL…blank; LC…contour line; CP…intersection point; PL…cutting plane; Ea…mark; Ar…incident range; Ep…top pin; Xi…interior side of the vehicle; Xo…exterior side of the vehicle; Pxz, Pyz, Pxy…planes.

Claims

1. A reflector having a reflective surface for reflecting display light, characterized in that, The reflector has the following features: The substrate has a curved adhesive surface; A reflective film, which forms the reflective surface when bonded to the adhesive surface; and The first to third reference protrusions are formed protrudingly around the substrate. The first to third reference protrusions each have a first and a second surface. The first surfaces of the first and second reference protrusions are located on the same first plane. The second surfaces of the first and third reference protrusions are each located on the same second plane. The first and second planes are imaginary planes that are orthogonal to each other.

2. The reflector according to claim 1, characterized in that, The third reference protrusion is located on the lower side of the substrate, and is positioned inside the vehicle interior in the vehicle width direction, closer to the center of the lower side in the vehicle width direction.

3. The reflector according to claim 1, characterized in that, The first to third reference protrusions each have a third surface. The third surfaces of the first to third reference protrusions are each located on the same third plane. The third surface contains the location reached by the center of the optical axis of the displayed light in the reflective surface.

4. The reflector according to claim 1, characterized in that, The reflective film allows a portion of visible light to pass through. The substrate is transparent. The reflector has a pressing portion formed around the substrate and has the marks of an ejector pin.

5. The reflector according to claim 4, characterized in that, The reflector has a fixing part, which is formed in a convex shape on the side of the substrate and is fixed to the fixing object. The pressed portion is formed at the root of the fixed portion.

6. A head-up display device, characterized in that, have: The reflector according to any one of claims 1 to 5; and A display device that emits the display light to the reflector.

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