Mirror and head-up display device

Abstract

To provide a mirror and a head-up display device which can be manufactured more easily.SOLUTION: The mirror 20 has a reflective curved surface 20a that reflects the display light. The mirror 20 includes a base material 21 having a sticking surface 26a forming a curved surface, and a mirror film 40 that forms the reflecting curved surface 26a in a state of being bonded to the sticking surface 20a, reflects light of polarized components corresponding to display light among visible lights, and transmits infrared light.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present disclosure relates to a mirror 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 emits display light when illuminated by the illumination device, and a reflector that reflects the display light. The reflector includes a reflective layer that is bonded to a substrate, and the reflective layer is a reflective polarizing multilayer film that reflects only specific polarized components of visible light. The reflective polarizing multilayer film transmits infrared light from external light such as sunlight, 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 mirror as a folding mirror that reflects display light emitted from a display unit so as to fold it back toward a second mirror. The folding mirror has a reflective curved surface with a curvature that causes the reflected display light to cross above and below before reaching the second mirror. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] International Publication No. 2020 / 246546 [Patent Document 2] Japanese Patent Application Laid-Open No. 2016-103008 Summary of the Invention [Problem to be solved by the invention]

[0005] The reflective polarizing multilayer film described in Patent Document 1 is generally formed on a flat surface of a substrate by vapor deposition. However, it is difficult to form a reflective polarizing multilayer film on a curved surface by vapor deposition as described in Patent Document 2, and an easier method of production has been desired.

[0006] The present disclosure has been made in consideration of the above-described circumstances, and aims to provide a mirror and a head-up display device that can be manufactured more simply. [Means for solving the problem]

[0007] In order to achieve the above object, a mirror according to a first aspect of the present disclosure comprises: A mirror having a reflective curved surface that reflects display light, a substrate having a curved attachment surface; The display device further includes a mirror film that forms the reflective curved surface when adhered to the attachment surface, reflects visible light with a polarized component corresponding to the display light, and transmits infrared light.

[0008] In order to achieve the above object, a head-up display device according to a second aspect of the present disclosure includes: the mirror; a display device that emits the display light; a concave mirror that reflects the display light reflected by the mirror, the mirror causes the reflected display light to cross in the vertical direction at a cross point before reaching the concave mirror; The cross point is located closer to the mirror than the concave mirror. [Effects of the Invention]

[0009] According to the present disclosure, mirror and head-up display devices can be manufactured more easily. [Brief explanation of the drawings]

[0010] [Figure 1]1 is a schematic diagram of a vehicle equipped with a head-up display device according to an embodiment of the present disclosure. [Figure 2] 1 is a schematic diagram illustrating a configuration of a head-up display device according to an embodiment of the present disclosure. [Figure 3] FIG. 1 is a perspective view of a mirror according to an embodiment of the present disclosure. [Figure 4] FIG. 1 is a front view of a mirror according to an embodiment of the present disclosure. [Figure 5] FIG. 1 is a side view of a mirror according to an embodiment of the present disclosure. [Figure 6] FIG. 1 is a perspective view of a mirror according to an embodiment of the present disclosure. [Figure 7] 1 is a cross-sectional view of a mirror film, a substrate body portion, and a transparent adhesive layer according to an embodiment of the present disclosure. [Figure 8] FIG. 1 is a perspective view of a contoured mirror substrate according to one embodiment of the present disclosure. [Figure 9] FIG. 10 is a perspective view of a mirror according to a modified example of the present disclosure. DETAILED DESCRIPTION OF THE INVENTION

[0011] A mirror and a head-up display device according to an embodiment of the present disclosure will be described with reference to the drawings. As shown in Fig. 1, the head-up display device 100 is installed in the dashboard of a vehicle 200. The head-up display device 100 emits display light L that displays an image toward a windshield 201, which is an example of a projection target member of the vehicle 200. The display light L is reflected by the windshield 201 and reaches a viewer 1 (mainly the driver of the vehicle 200). As a result, the head-up display device 100 displays a virtual image V so as to be superimposed on an actual scene seen through the windshield 201.

[0012] As shown in FIG. 2, the head-up display device 100 includes a display device 10, a mirror 20, a concave mirror 30, a mirror driving mechanism 35, and a housing 60.

[0013] 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 that illuminates the liquid crystal display panel 11. The display device 10 of the type including the display panel 11 has lower heat resistance than a type including an OLED (Organic Light-Emitting Diode) or a type that receives light reflected by a DMD (Digital Micromirror Device) and displays an image on a transmissive screen. For this reason, in the display device 10 of the type including the display panel 11, it is particularly required to suppress a rise in temperature of the display panel 11 using a mirror film 40, which will be described later.

[0014] The concave mirror 30 reflects the display light L reflected by the mirror 20 toward the windshield 201 while expanding the light. The mirror driving mechanism 35 is configured to rotate the concave mirror 30 around a rotation axis J extending along the vehicle width direction. By rotating the concave mirror 30 around the rotation axis J, the irradiation position of the display light L with respect to the viewer 1 is adjusted in the height direction.

[0015] The housing 60 is made of a non-transparent resin material or a metal material and has a hollow, substantially rectangular parallelepiped shape. The housing 60 accommodates the mirror 20, the concave mirror 30, and the mirror drive mechanism . The housing 60 has an opening 61a formed in a position facing the windshield 201. The housing 60 has a curved plate-like window portion 50 that closes the opening 61a. The window portion 50 is made of a translucent resin material such as acrylic, through which the display light L passes. The housing 60 includes a mirror holder (not shown) that houses fixed portions 22L, 22R, and 22C (described later) of the mirror 20. With the fixed portions 22L, 22R, and 22C (described later) of the mirror 20 housed in the mirror holder, the fixed portions 22L, 22R, and 22C are biased and fixed by a leaf spring (not shown).

[0016] The mirror 20 is configured as a corrective mirror with a reflective polarizing mirror film (cold mirror film) and has a reflective curved surface 20a formed by a free-form surface. The mirror 20 reflects the display light L from the display device 10 toward the concave mirror 30. The mirror 20 is shaped like a substantially rectangular plate. The reflective curved surface 20a faces diagonally downward and forward of the vehicle. The mirror 20 has a curvature (the reciprocal of the radius of curvature) that causes the reflected display light L to cross above and below at a cross point CP before reaching the concave mirror 30. The mirror 20 has a curvature such that the focal point of the mirror 20 is located on the optical path between the mirror 20 and the concave mirror 30. In other words, the distance from the mirror 20 to the concave mirror 30 is set longer than the focal length of the mirror 20. The cross point CP is located closer to the mirror 20 than the center of the optical path between the mirror 20 and the concave mirror 30. The cross point CP may be located at this central position, or may be located closer to the concave mirror 30 than this central position.

[0017] 3 and 4, the mirror 20 includes a substrate 21 and a visible light polarization reflective mirror film 40. The substrate 21 includes a substrate main body 26, a plurality of fixed portions 22L, 22R, and 22C, a plurality of reference protrusions 24a, 24b, and 24c, and a plurality of pressed portions 25a, 25b, 25c, and 25d. In the following description, the longitudinal direction of the mirror 20 is the X direction, the lateral direction of the mirror 20 is the Y direction, and the thickness direction of the mirror 20 is the Z direction. The X direction corresponds to the left-right direction of the virtual image V as seen by the viewer 1, i.e., the vehicle width direction, the Y direction corresponds to the up-down direction of the virtual image V as seen by the viewer 1, and the Z direction corresponds to the depth direction of the virtual image V as seen by the viewer 1. In the following description, left and right are defined as directions when the curved reflecting surface 20a of the mirror 20 is viewed from the front.

[0018] The base material 21 is integrally formed from a translucent synthetic resin by injection molding. The substrate main body 26 is shaped like a curved plate that is long in the X direction and short in the Y direction. The surface of the substrate 21 (the surface on the reflective curved surface 20a side) is an attachment surface 26a to which the mirror film 40 is attached. The attachment surface 26a is a convexly curved surface in the X direction and a concavely curved surface in the Y direction. The height of the attachment surface 26a is low at both ends in the X direction and gradually increases as it approaches the center in the X direction. The height of the attachment surface 26a is highest at one end in the Y direction (the end in the +Y direction in FIG. 3 ) and gradually decreases as it approaches the other end in the Y direction (the end in the -Y direction in FIG. 3 ). The attachment surface 26a has a generally rectangular shape that is long in the X direction and short in the Y direction when viewed from the front of the attachment surface 26a. An inclined side portion 21b is formed on the lower side of the attachment surface 26a on the outer side Xo of the vehicle cabin in the X direction (the right side in FIG. 4). The outer side Xo of the vehicle cabin is defined by the direction as seen by the viewer 1 in the driver's seat. The inclined side portion 21b inclines upward toward the outer side Xo of the vehicle cabin, and extends to connect the lower side and the right side of the base material main body portion 26. The inclined side portion 21b gives the mirror 20 a shape in which the outer side Xo of the vehicle cabin and the lower portion are cut out, thereby preventing the mirror 20 from interfering with other components (such as ducts) inside the vehicle dashboard.

[0019] The fixed portions 22L and 22R are located on the left and right side surfaces of the base body portion 26, respectively, and are generally cylindrical and extend in the X direction. The left and right side surfaces are located on both sides of the base body 21 in the X direction and extend in the Y direction. The fixed portions 22L and 22R are located at the upper end portions of the left and right side surfaces, respectively, and are arranged coaxially. The fixed portion 22C is located on the lower side surface of the base material 21 and has a substantially spherical shape. This lower side surface extends in the X direction. The fixed portion 22C is located on the lower side surface closer to the cabin interior Xi than the center in the X direction. The fixed portions 22L, 22R, and 22C are inserted into a mirror holder (not shown) and are held in the mirror holder by a plate spring (not shown).

[0020] 7, the mirror film 40 is adhered to the attachment surface 26a of the substrate main body portion 26 via a transparent adhesive layer 49. The transparent adhesive layer 49 is a transparent optical adhesive layer, for example, OCA (Optically Clear Adhesive) or OCA (Optically Clear Resin).

[0021] The mirror film 40 is a reflective polarizing multilayer film, which is made by laminating several hundred layers of polyester resin films with different refractive indices. The refractive index of each layer of the mirror film 40 is adjusted so as to reflect only specific polarization components of visible light A. The mirror film 40 has wavelength selectivity for reflected wavelengths, and for S-polarized light, the reflectance for wavelengths of 780 nm to 2500 nm is, for example, 20% or less, more preferably 10% or less, for example, about 5%, and for wavelengths of 450 nm to 650 nm is, for example, 80% or more, more preferably 90% or more, for example, 95%.

[0022] The mirror film 40 allows light A2, a portion of visible light A, and infrared light B to pass through without reflecting it. Light A2 and infrared light B pass through the translucent substrate main body 26 and reach the housing 60. This suppresses absorption of light A2 and infrared light B in the substrate main body 26, making it difficult for the temperature of the substrate 21 to rise compared to a substrate made of black resin. This suppresses peeling of the mirror film 40 from the substrate 21 due to this temperature rise. Specifically, the mirror film 40 has a reflection axis and reflects light A1, a linearly polarized component of visible light A that is parallel to the reflection axis direction (the left-right direction in FIG. 4). The mirror film 40 is oriented such that the reflection axis direction of the mirror film 40 is approximately parallel to the polarization direction of display light L emitted from the display panel 11. The mirror film 40 passes light A2, a linearly polarized component of visible light A that is perpendicular to the reflection axis direction, without reflecting it.

[0023] In this way, by disposing the mirror film 40, it is possible to reduce part of the external light (light A2 of visible light A and infrared light B) such as sunlight heading toward the display panel 11. Therefore, it is possible to suppress a rise in temperature of the display panel 11 and to suppress attenuation of the display light L from the display panel 11 while reflecting it.

[0024] The mirror film 40 is in the form of a flexible sheet. The mirror film 40 has a flat shape before being attached to the attachment surface 26a, and has a curved shape that conforms to the attachment surface 26a once attached to the attachment surface 26a. The mirror film 40 is formed with an area smaller than the attachment surface 26a and is located in the center of the attachment surface 26a. The mirror film 40 is curved so as to be concave in the Y direction and convex in the X direction. The curvature of the mirror film 40 in the Y direction causes the display light L to cross above and below at a cross point CP before reaching the concave mirror 30. The absolute value of the average curvature of the mirror film 40 in the Y direction is set to be larger than the absolute value of the average curvature of the mirror film 40 in the X direction.

[0025] As shown in FIG. 4, the mirror film 40 has an outer shape including an upper side 41U, a lower side 41D, a left side 41L, and a right side 41R. Upper side 41U and lower side 41D are curved to form a U-shape and extend in the X direction. The opening side of this U-shape faces upward in the Y direction, i.e., toward the reflected light traveling side (+Y side). Upper side 41U and lower side 41D have a U-shape in which the deepest valleys are at the center in the X direction and the depth of the valleys gradually decreases toward both sides of the center in the X direction.

[0026] As shown in Fig. 8, each contour line LC on the attachment surface 26a of the substrate main body 26 extends in a U-shape in the X direction, similar to the upper side 41U. Each contour line LC is a line connecting points at the same height in the Z direction, and as shown in Fig. 5, indicates a height based on a tangential plane PL at which a point 20p of the reflective curved surface 20a, at which the optical axis center (Gattley) of the display light L is tangent, is in contact. By forming at least a portion of the upper side 41U in a shape that follows the contour line LC, the difference in height on the attachment surface 26a is reduced when the mirror film 40 is attached from the upper side 41U to the reflective curved surface 20a, making it easier to attach the mirror film 40.

[0027] As shown in FIG. 4, an inclined side portion 41E is formed at the right end of the lower side 41D, along the inclined side portion 21b described above. The left side 41L extends downward from the left end of the upper side 41U and is curved and connected to the left end of the lower side 41D. The right side 41R extends downward from the right end of the upper side 41U and is curved and connected to the right end of the inclined side portion 41E.

[0028] The upper side 41U has three straight line portions 42a, 42b, and 42c, and the lower side 41D has one straight line portion 42d. Each of the straight line portions 42a to 42d extends linearly in the X direction (the longitudinal direction of the mirror film 40) when the mirror film 40 is not attached to the attachment surface 26a and is in a flat state. Each of the straight line portions 42a to 42d is used for positioning the mirror film 40 when it is attached to the attachment surface 26a.

[0029] Straight line portion 42a is located at the left end of top side 41U. Straight line portion 42b is located at the right end of top side 41U. Straight line portion 42c is located at the center of top side 41U in the X direction. Straight line portions 42a, 42b, and 42c are connected by curved lines. The straight line portion 42c is located closer to the center point O (lower) of the mirror film 40 in the Y direction than the straight line portions 42a and 42b. The straight line portion 42c is set to be shorter than the straight line portions 42a and 42b. By arranging the straight line portions 42a, 42b, and 42c in parallel to each other and at stepped positions in this manner, the accuracy of measuring the dimensions of the mirror film 40 can be improved.

[0030] The straight line portion 42d is located in the center of the bottom side 41D in the X direction. The straight line portion 42d is formed to be longer than the straight line portions 42a, 42b, and 42c.

[0031] The mirror film 40 has a curved shape (a curved, substantially rectangular shape) that is curved in a U-shape in the X direction. The curved shape of the mirror film 40 is a shape obtained after warping is applied, which distorts the image displayed on the display panel 11 to cancel out the distortion of the virtual image V. This allows the area of ​​the mirror film 40 that is actually used to be increased. 4 and 5, the mirror film 40 reflects the display light L arriving from the display light arrival side (-Y side) on the display panel 11 side toward the reflected light traveling side +Z toward the concave mirror 30. The mirror film 40 is arranged so that the U-shaped opening side faces the reflected light traveling side (+Y side).

[0032] A curved reflective surface 20a is formed on the front surface of the mirror film 40 (the surface opposite to the substrate 21). As shown in FIG. 3, display light L from the display panel 11 is incident on an incident range Ar of the curved reflective surface 20a. The incident range Ar is formed in an area having a certain margin BL from the outer shape of the mirror film 40. The incident range Ar has a shape similar to the outer shape of the mirror film 40. The margin BL is formed with a length greater than the expected positional deviation of the incident range Ar.

[0033] The plurality of (three) reference protrusions 24a, 24b, and 24c are formed on the side surface of the base material 21 in a rectangular parallelepiped shape. The reference protrusions 24a and 24b are located on both sides in the X direction of the upper side surface of the base material 21. The two reference protrusions 24a and 24b are located so as to overlap each other when viewed from the X direction. As shown in FIG. 4, the upper surfaces 24U of the two reference projections 24a and 24b are located on the same plane Pxz extending in the XZ plane.

[0034] The reference protrusion 24c is located on the lower side surface of the base material 21, and is provided at a position overlapping the reference protrusion 24a when viewed from the Y direction. The side surfaces 24S of the reference projections 24a and 24c extending in the Y direction are located on the same plane Pyz extending in the YZ plane. 5, the back surfaces 24B of the reference projections 24a, 24b, and 24c are located on the same plane Pxy that extends in the XY plane. The plane Pxy is the same plane as the tangent plane PL.

[0035] Here, when attaching the mirror film 40 to the attachment surface 26a of the substrate main body portion 26, or when measuring the shape of the reflective curved surface 20a of the mirror 20, the substrate 21 is held via the reference protrusions 24a, 24b, and 24c by a holding jig not shown. 4, the first holding portion J1 of the holding jig is brought into contact with the upper surfaces 24U of the reference protrusions 24a and 24b, respectively, so that the substrate 21 is positioned in the Y direction with high precision by the holding jig. Furthermore, the second holding portion J2 of the holding jig is brought into contact with the side surfaces 24S of the reference projections 24a and 24c, respectively, whereby the substrate 21 is positioned in the X direction with high precision by the holding jig. 5, the third holding portion J3 of the holding jig is brought into contact with the rear surfaces 24B of the reference protrusions 24a, 24b, and 24c, respectively, so that the substrate 21 is positioned in the Z direction with high precision by the holding jig. The second holding portion J2 may contact the side surfaces of the reference protrusions 24a, 24c opposite to the side surface 24S. The third holding portion J3 may contact the front surfaces of the front sides of the reference protrusions 24a, 24b, 24c. The third holding portion J3 may contact the back surfaces 24B or front surfaces of two of the three reference protrusions 24a, 24b, 24c.

[0036] The reference protrusion 24c is located on the passenger compartment inner side Xi of the lower side surface of the base material 21, closer to the center in the X direction. More specifically, the reference protrusion 24c is located on the end of the passenger compartment inner side Xi of the lower side surface of the base material 21. The passenger compartment inner side Xi is the right side as seen from the driver's perspective in a left-hand drive vehicle, and the left side as seen from the driver's perspective in a right-hand drive vehicle. Since the passenger compartment inner side Xi has more space than the passenger compartment outer side Xo, the reference protrusion 24c is formed on the passenger compartment inner side Xi.

[0037] As shown in FIG. 6, the plurality of pressed portions 25a to 25d are formed as rectangular parallelepipeds around the base material 21. The plurality of pressed portions 25a to 25d are portions that are pressed by an ejector pin Ep during injection molding. A circular mark Ea of the ejector pin Ep is formed on the rear surface of each of the pressed portions 25a to 25d.

[0038] The pressed portion 25a is located at the base of the fixed portion 22R on the right side surface of the base material 21. The pressed portion 25a has a rectangular parallelepiped shape that is long in the Y direction. The pressed portion 25b is located at the base of the fixed portion 22L on the left side surface of the base material 21. The pressed portion 25b has a rectangular parallelepiped shape that is long in the Y direction. The pressed portion 25c is located at the base of the fixed portion 22C on the lower side surface of the base material 21. The pressed portion 25c has a rectangular parallelepiped shape that is long in the X direction. The pressed portion 25d is located on the lower side surface of the base material 21 and has a rectangular parallelepiped shape that is long in the X direction. The pressed portion 25d is provided at a position separated from the fixed portions 22L, 22R, and 22C. The pressed portions 25a to 25d may be held by a holding jig, similar to the reference protrusions 24a, 24b, and 24c.

[0039] (effect) According to the embodiment described above, the following effects are achieved. (1-1) The mirror 20 has a reflective curved surface 20a that reflects the display light L. The mirror 20 includes a base material 21 having a curved attachment surface 26a, and a mirror film 40 that forms the reflective curved surface 20a when adhered to the attachment surface 26a, reflects light of the polarized component of visible light A that corresponds to the display light L, and transmits infrared light B. According to this configuration, the mirror 20 can be easily manufactured by attaching the mirror film 40 to the curved attachment surface 26a. Furthermore, due to the properties of the mirror film 40, it is possible to suppress unnecessary reflection of external light toward the display panel 11, thereby suppressing a rise in the temperature of the display panel 11.

[0040] (1-2) The base material 21 is made of a translucent synthetic resin. According to this configuration, the light transmitted through the mirror film 40 is transmitted through the base material 21 and is prevented from being absorbed by the base material 21. Therefore, it is possible to prevent the temperature of the base material 21 from rising, and the mirror film 40 is prevented from peeling off from the attachment surface 26a. Furthermore, when the base material 21 is made of glass, it is difficult to form the attachment surface 26a as a curved surface, but when using synthetic resin, a flexible shape can be achieved by injection molding, so it is easy to form the attachment surface 26a as a curved surface.

[0041] (1-3) The reflective curved surface 20a is convex in the X direction, which is an example of a first direction, and concave in the Y direction, which is an example of a second direction. The outer shape of the mirror film 40 is U-shaped and curved in the X direction. This configuration makes it easy to attach the mirror film 40 to the reflective curved surface 20a. In particular, when attaching the mirror film 40, wrinkles are less likely to form in the central portion of the mirror film 40 in the X direction, which improves manufacturability.

[0042] (1-4) The reference plane is the tangential plane PL of the curved reflecting surface 20a, which is in contact with a point 20p corresponding to the optical axis center of the display light L. When a contour line LC indicating the height relative to the tangential plane PL is drawn on the curved reflecting surface 20a, at least a part of the upper side 41U of the outline of the mirror film 40 extends along a part of the contour line LC. According to this configuration, a part of the mirror film 40 can be attached so as to follow the contour line LC, which makes it easy to attach the mirror film 40 to the reflective curved surface 20a.

[0043] (1-5) The curved reflective surface 20a has an incident range Ar where the display light L is incident. The outer shape of the mirror film 40 is formed so that a certain margin BL is provided around the incident range Ar. According to this configuration, the mirror film 40 has an outer shape corresponding to the incident range Ar, and the mirror film 40 is prevented from becoming unnecessarily large.

[0044] (1-6) The mirror 20 reflects the display light L toward the reflected light traveling side (+Y side) in the Y direction. The outer shape of the mirror film 40 is curved in the X direction so as to form a U-shape that opens toward the reflected light traveling side (+Y side). According to this configuration, the area of ​​the mirror film 40 can be used more efficiently as a reflective area.

[0045] (1-7) The outer shape of the mirror film 40 has an upper side 41U, which is an example of a first side, and a lower side 41D, which is an example of a second side, extending parallel to each other in the X direction. The upper side 41U has two straight line portions 42a and 42b, which are examples of first straight line portions, located at both ends in the X direction. The lower side 41D has a straight line portion 42d, which is an example of a second straight line portion, located in the center in the X direction. The straight line portions 42a, 42b, and 42d form straight lines extending in the longitudinal direction (X direction) of the mirror film 40 when the mirror film 40 is peeled off from the attachment surface 26a and laid flat. According to this configuration, the mirror film 40 can be attached to the attachment surface 26a with high positional accuracy using the straight line portions 42a, 42b, and 42d.

[0046] (1-8) The outer shape of the mirror film 40 has an upper side 41U and a lower side 41D that extend parallel to each other in the X direction. The upper side 41U has a shape that includes a curved line and straight line portions 42a, 42b, and 42c. The curved line is sandwiched between two straight line portions 42a to 42c that are positioned at offset positions in the Y direction, which is perpendicular to the X direction. This configuration improves the accuracy of dimensional measurement by forming parallel, stepped straight line portions 42a, 42b, and 42c instead of a continuous curve. In addition, the straight line portions 42a, 42b, and 42c allow the mirror film 40 to be attached to the attachment surface 26a with high positional accuracy.

[0047] (1-9) The head-up display device 100 includes a mirror 20, a display device 10 that emits display light L, and a concave mirror 30 that reflects the display light L reflected by the mirror 20. The mirror 20 causes the reflected display light L to cross in the vertical direction at a cross point CP before reaching the concave mirror 30. The cross point CP is located closer to the mirror 20 than the concave mirror 30. According to this configuration, the cross point CP is located closer to the mirror 20, which makes it possible to reduce the size of the mirror 20, which is difficult to manufacture.

[0048] (2-1) The mirror 20 has a curved reflective surface 20a that reflects the display light L. The mirror 20 includes a base material 21 having a curved attachment surface 26a, a mirror film 40 that forms the reflective curved surface 20a when attached to the attachment surface 26a, and reference protrusions 24a, 24b, and 24c that are examples of first to third reference protrusions and are formed to protrude from the periphery of the base material 21. The reference protrusions 24a, 24b, and 24c each have an upper surface 24U and a side surface 24S that are examples of a first and second surface. The upper surfaces 24U of the reference protrusions 24a and 24b are located on a plane Pxz, which is an example of a first plane. The side surfaces 24S of the reference protrusions 24a and 24c are located on a plane Pyz, which is an example of a second plane. The planes Pxz and Pyz are imaginary planes that are perpendicular to each other. A mirror 20 having a curved reflecting surface 20a is required to have high molding precision. However, compared to a vapor-deposited mirror, a mirror 20 having a curved reflecting surface 20a formed by adhering a mirror film 40 is subject to load due to the adhering of the mirror film 40, which may result in a relatively low shape precision of the curved reflecting surface 20a. In this regard, according to the above configuration, the mirror film 40 is attached in a state where the base material 21 is positioned using the reference protrusions 24a, 24b, and 24c, thereby improving the shape accuracy of the curved reflecting surface 20a. Furthermore, in this positioned state, the shape of the curved reflecting surface 20a can be measured with high accuracy.

[0049] (2-2) The reference protrusion 24c is located on the lower side surface of the base material 21, and is located on the inner side Xi of the vehicle cabin than the center of the lower side surface in the vehicle width direction (X direction). According to this configuration, the inside side Xi of the vehicle cabin in the vehicle width direction has relatively more space than the outside side Xo of the vehicle cabin in the vehicle width direction, and is therefore suitable as a position for providing the reference protrusion 24c.

[0050] (2-3) Each of the reference protrusions 24a, 24b, and 24c has a back surface 24B, which is an example of a third surface. The back surfaces 24B of the reference protrusions 24a, 24b, and 24c are located on the same plane Pxy, which is an example of a third plane. The back surface 24B includes within its plane a point 20p that corresponds to the optical axis center of the display light L on the reflective curved surface 20a. According to this configuration, the mirror film 40 is attached in a state where the base material 21 is positioned using the reference protrusions 24a, 24b, and 24c, thereby improving the shape accuracy of the curved reflecting surface 20a. Furthermore, in this positioned state, the shape of the curved reflecting surface 20a can be measured with high accuracy.

[0051] (2-4) The mirror film 40 transmits a part of visible light A. The base material 21 is translucent. The mirror 20 is formed around the periphery of the base material 21 and includes pressed portions 25a to 25d having marks Ea of the ejection pin Ep. According to this configuration, the pressed portions 25a to 25d having the marks Ea are formed around the base material 21, thereby preventing the marks Ea from being illuminated by the visible light A transmitted through the mirror film 40, thereby suppressing the generation of stray light. The pressed portions 25a to 25d can also serve as surfaces to be placed on a holding jig when the mirror film 40 is attached.

[0052] (2-5) The mirror 20 includes fixed portions 22L, 22R, and 22C that are formed in a convex shape on the side surface of the base material 21 and are fixed to a mirror holder (not shown), which is an example of a fixing object. The pressed portions 25a to 25d are formed at the bases of the fixed portions 22L, 22R, and 22C. According to this configuration, even if the pressed portions 25a to 25d are pressed by the ejector pin Ep, the fixed portions 22L, 22R, 22C distribute the force, so that the pasted surface 26a is less likely to deform, and the precision of the reflective curved surface 20a can be improved.

[0053] (Variation) The above embodiment can be modified as follows. In the above embodiment, the concave mirror 30 may be omitted. In the above embodiment, the mirror driving mechanism 35 may be omitted. In the above embodiment, the number or positions of the straight line portions 42a to 42d can be changed as appropriate. Also, the straight line portions 42a to 42d may be omitted, and the upper side 41U and the lower side 41D may be formed as curved lines over the entire area.

[0054] In the above embodiment, the head-up display device 100 is mounted on the vehicle 200, but it may be mounted on a vehicle other than the vehicle 200, such as an airplane or a ship. In addition, the projection member is not limited to the windshield, and may be a dedicated combiner.

[0055] In the above embodiment, the number, positions or shapes of the fixed portions 22L, 22R, 22C can be changed as appropriate. As shown in FIG. 9, the fixed portions 22L, 22R, and 22C may be omitted. The number, positions, or shapes of the pressed portions 25a to 25d in the above embodiment can be changed as appropriate. The pressed portions 25a to 25d in the above embodiment may be omitted. The pressed portions to be pressed by the ejector pins Ep may be formed on the back surface of the substrate 21, closer to the outer periphery than the reflective curved surface 20a.

[0056] In the above embodiment, the base material 21 is not limited to synthetic resin, and may be made of glass as long as it has light-transmitting properties. In the above embodiment, in the base material 21, only the base material main body 26 may be made of a light-transmitting synthetic resin, and the fixed portions 22L, 22R, 22C, the reference protrusions 24a, 24b, 24c, and the pressed portions 25a to 25d may be made of a light-blocking material. Alternatively, the entire base material 21 may be made of a light-blocking material. In the above embodiment, the lower side 41D may be configured with three straight line portions 42a to 42c and a curved line between the straight line portions 42a to 42c, similar to the upper side 41U.

[0057] In the above embodiment, the mirror film 40 has a U-shape curved in the X direction, but may have a rectangular shape that is long in the X direction as long as the shape includes the incident range Ar. Furthermore, although the mirror film 40 is attached to the central region of the surface of the base material 21, it may be attached over the entire surface of the base material 21. In the above embodiment, the curved shape of the attachment surface 26a can be changed as appropriate. Although the mirror 20 forms a cross optical path, the shape of the reflective curved surface 20a may be such that a cross optical path is not formed. Furthermore, the attachment surface 26a may have a concave or convex curve in only one of the X and Y directions. In the above embodiment, at least a portion of the upper side 41U is shaped to follow the contour line LC, but at least a portion of the lower side 41D may also be shaped to follow the contour line LC. Furthermore, at least a portion of both the upper side 41U and the lower side 41D may also be shaped to follow the contour line LC. In other words, in this case, the outer shape of the mirror film may be a shape that widens in both directions in a predetermined direction (a hand drum shape, an hourglass shape). The mirror film 40 may be a film other than a reflective polarizing film.

[0058] In the above embodiment, the display device 10 is a type including a display panel 11, but the present invention is not limited to this and may be of any type as long as it is capable of emitting display light L from the display surface. The display device 10 may be, for example, a type including an OLED, a type that receives light reflected by a DMD and displays an image on a transmissive screen, or the like. [Explanation of symbols]

[0059] 1...Viewer 10... display device, 11... display panel, 12... backlight 20...mirror, 20a...reflective surface, 20p...point 21... Base material, 21b... Inclined side part, 22C, 22L, 22R... Fixed part, 24a, 24b, 24c... Reference protrusion, 24B... Back surface, 24S... Side surface, 24U... Top surface, 25a~25d... Pressed part, 26... Base material body part, 26a... Pasting surface 30…Concave mirror 35...Mirror drive mechanism 40...mirror film, 41U...upper edge, 41D...lower edge, 41L...left edge, 41R...right edge, 41E...inclined edge portion, 42a to 42d...straight portion, 49…Transparent adhesive layer 50...Window section 60... housing, 61a... opening 100...Head-up display device 200...Vehicle, 201...Windshield A...visible light, A1, A2...light, B...infrared light, J...rotation axis, J1 to J3...first to third holding parts, L...display light, O...center point, V...virtual image, BL...margin, LC...contour line, CP...cross point, PL...tangent plane, Ea...mark, Ar...incident range, Ep...eject pin, Xi...inside of vehicle cabin, Xo...outside of vehicle cabin, Pxz, Pyz, Pxy...plane

Claims

1. A mirror having a reflective curved surface that reflects display light, a substrate having a curved attachment surface; a mirror film that forms the reflective curved surface when adhered to the attachment surface, reflects light of a polarized component corresponding to the display light among visible light, and transmits infrared light; mirror.

2. The base material is formed of a light-transmitting synthetic resin. The mirror of claim 1 .

3. the reflective curved surface is a convex curved surface in a first direction which is a longitudinal direction of the mirror, and a concave curved surface in a second direction which is a lateral direction of the mirror, The outer shape of the mirror film is U-shaped and curved in the first direction. The mirror of claim 1 .

4. a tangent plane of the reflective curved surface, which is in contact with a point where the optical axis center of the display light reaches, is set as a reference plane; When a contour line indicating a height relative to the reference plane is drawn on the reflective curved surface, a part of at least any side of the outer shape of the mirror film extends along a part of the contour line. The mirror of claim 1 .

5. an incident area onto which the display light is incident is formed on the reflective curved surface; The outer shape of the mirror film is formed in a shape with a certain margin around the incident range. The mirror of claim 1 .

6. the mirror reflects the display light toward a reflected light traveling side in a second direction, which is a short side direction of the mirror; The outer shape of the mirror film is curved in a first direction, which is the longitudinal direction of the mirror, so as to form a U-shape that opens toward the reflected light traveling side. The mirror of claim 1 .

7. The outer shape of the mirror film has a first side and a second side extending parallel to each other in a first direction which is a longitudinal direction of the mirror, the first side includes two first linear portions located at both ends in the first direction, the second side includes a second linear portion located at the center in the first direction, The first linear portion and the second linear portion form a straight line extending in the longitudinal direction of the mirror film when the mirror film is peeled off from the attachment surface and laid flat. Mirror according to claim 1, 3 or 6.

8. The outer shape of the mirror film has a first side and a second side extending parallel to each other in a first direction which is a longitudinal direction of the mirror, At least one of the first side and the second side has a shape including a curved line and a straight line, the curved line is disposed so as to be sandwiched between two of the linear lines disposed at positions shifted in a second direction which is a short-side direction of the mirror; Mirror according to claim 1, 3 or 6.

9. A mirror according to any one of claims 1 to 6; a display device that emits the display light; a concave mirror that reflects the display light reflected by the mirror, the mirror causes the reflected display light to cross in the vertical direction at a cross point before reaching the concave mirror; the cross point is located closer to the mirror than the concave mirror; Head-up display device.

Images