Head-up display device

Abstract

To provide a head-up display device capable of size reduction.SOLUTION: A head-up display device comprises: a display portion that emits display light; a plane mirror unit 20 that reflects the display light from the display portion toward a windshield; and a casing having a supporting portion for supporting the plane mirror unit 20. The plane mirror unit 20 includes a plane mirror 28 including a mirror surface 28a that reflects the display light, and a mirror holder 27 for holding the plane mirror 28. The mirror holder 27 is provided with positioning holes 26g, 26h, 26j, and 26k, which are positioned further toward the front side than the mirror surface 28a and which are an example of positioning portions for positioning the plane mirror unit 20 with respect to the supporting portion of the casing.SELECTED DRAWING: Figure 12

Description

[Technical field]

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

[0002] Conventionally, there has been known a head-up display device that displays a virtual image by irradiating a display light onto a windshield, etc. For example, a head-up display device described in Patent Document 1 includes a plane mirror that reflects the display light, a holder that holds the plane mirror, and a support part that supports the holder from the rear side. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2017-171041 A Summary of the Invention [Problem to be solved by the invention]

[0004] The holder described in Patent Document 1 is supported by a support portion from the rear side, which leads to an increase in size of the rear side of the holder, and therefore to an increase in size of the head-up display device.

[0005] The present invention has been made in consideration of the above-mentioned circumstances, and has an object to provide a head-up display device that can be made compact. [Means for solving the problem]

[0006] In order to achieve the above object, the present invention View of The head-up display device according to the present invention is A display unit that emits display light; a mirror unit that reflects the display light from the display unit toward a projection member; a housing having a support portion for holding the mirror unit, The mirror unit includes: a mirror including a mirror surface that reflects the display light; A mirror holder for holding the mirror; Equipped with The mirror holder has the positioning portion and protrudes toward the front side of the mirror surface. A pair of approximately triangular pyramids A protrusion is provided, The protrusion forms the positioning portion, The faces on the front side of each A positioning surface that comes into contact with the support portion year, The positioning surface is When the direction in which the display light is reflected by the mirror surface is defined as a reflection direction, and the direction perpendicular to the reflection direction and along the mirror surface is defined as a width direction, The shape includes an upper side and a bottom side that are formed along the width direction, The top side is shorter than the bottom side and is located closer to the reflection direction than the bottom side. Effect of the Invention

[0007] According to the present invention, it is possible to reduce the size of a head-up display device. [Brief description of the drawings]

[0008] [Figure 1] 1 is a schematic diagram of a vehicle equipped with a head-up display device according to an embodiment of the present invention. [Diagram 2] 1 is a schematic diagram of a head-up display device according to an embodiment of the present invention. [Diagram 3] 1 is a perspective view of a head-up display device according to an embodiment of the present invention. [Figure 4] 1 is a perspective view of a head-up display device according to an embodiment of the present invention. [Diagram 5] 1 is a perspective view of a head-up display device with an upper case removed according to an embodiment of the present invention; [Figure 6] 1 is a perspective view showing a plane mirror unit and a housing according to an embodiment of the present invention. [Figure 7] FIG. 2 is an exploded perspective view of a plane mirror unit according to an embodiment of the present invention. [Figure 8] 1 is a perspective view of a mirror support member according to one embodiment of the present invention; [Figure 9] 1 is a perspective view of a mirror support member according to one embodiment of the present invention; [Figure 10] FIG. 2 is a perspective view of a front frame according to one embodiment of the present invention. [Figure 11] FIG. 2 is a perspective view of a front frame according to one embodiment of the present invention. [Figure 12] FIG. 1 is a perspective view of a plane mirror unit according to an embodiment of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] An embodiment of a head-up display device according to the present invention will be described with reference to the drawings.

[0010] 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, a virtual image V is displayed so as to be visible to the viewer 1.

[0011] As shown in FIG. 2, the head-up display device 100 includes a display unit 10, a plane mirror unit 20, a concave mirror 30, a concave mirror driving unit 40, and a housing 60. In the following description, left and right, up and down, and front and back are defined based on the direction when mirror surface 28a of plane mirror unit 20 is viewed from the front. In Figures 3 to 12, left is abbreviated as Lf, right is abbreviated as Rt, up is abbreviated as Up, down is abbreviated as Dn, front is abbreviated as Fr, and back is abbreviated as Bk. Furthermore, the left and right direction coincides with the X direction, the up and down direction coincides with the Y direction, and the front and back direction coincides with the Z direction.

[0012] 2, the display unit 10 emits display light L that displays an image under the control of a control unit (not shown). The display unit 10 includes, for example, a light source and a liquid crystal display panel (not shown).

[0013] The plane mirror unit 20 reflects the display light L emitted by the display unit 10 toward the concave mirror 30. A specific configuration of the plane mirror unit 20 will be described later.

[0014] 2 and 5, the concave mirror 30 is formed in a substantially rectangular plate shape that is long in the X direction and is curved along the X direction. The concave mirror 30 is formed by evaporating a metallic reflective material such as aluminum onto a synthetic resin base material having a concave curved surface. The concave mirror 30 reflects the display light L reflected by the plane mirror unit 20 toward the windshield 201 while expanding the light. The concave mirror 30 is configured to be rotatable by the concave mirror drive unit 40 about a rotation axis Ax that extends in a direction perpendicular to the paper surface of FIG. 2. The concave mirror driving unit 40 rotates the concave mirror 30 about a rotation axis Ax.

[0015] 2 and 3, the housing 60 is made of a non-translucent resin or metal and has a hollow, substantially rectangular parallelepiped shape. Each component of the head-up display device 100 is housed inside the housing 60. The housing 60 includes a lower case 60b having a box shape that opens upward, and an upper case 60a that closes the opening of the lower case 60b. The upper case 60a has an opening 61 formed in a position facing the windshield 201. The upper case 60a includes a curved plate-like window portion 50 that closes the opening 61. The window portion 50 is made of a translucent resin such as acrylic that transmits the display light L.

[0016] As shown in Fig. 4, the upper case 60a is located on the edge of the opening 61 and has a light-shielding wall 65 formed of a light-shielding resin. The light-shielding wall 65 has a rectangular plate shape that is long in the X direction. The lower end of the light-shielding wall 65 overlaps with the upper end of the mirror surface 28a of the plane mirror unit 20 in the Z direction. As a result, the upper end of the mirror surface 28a is hidden by the light-shielding wall 65. The light-shielding wall 65 has a function of preventing stray light from entering the optical path of the display light L in addition to a function as a parting material that hides the upper end of the mirror surface 28a.

[0017] As shown in FIG. 6, the lower case 60b is box-shaped with openings toward the top and back. The lower case 60b includes support parts 62a and 62b that support the plane mirror unit 20. The support parts 62a and 62b are triangular pyramid-shaped and are aligned along the X direction so as to sandwich the optical path of the display light L between the display unit 10 and the plane mirror unit 20. The support parts 62a and 62b include positioning surfaces 62a1 and 62b1 located on the back side of the support parts 62a and 62b, respectively, and inner surfaces 62a2 and 62b2 located on the optical path side. The positioning surfaces 62a1 and 62b1 are substantially right-angled triangular with their bases along the X direction, and are inclined toward the back side as they move upward.

[0018] Two positioning pins 62c, 62d and a screw hole 62h are formed on the positioning surface 62a1. The positioning pin 62c is located at the top of the positioning surface 62a1 and has a cylindrical shape extending perpendicular to the positioning surface 62a1. The positioning pin 62d is located at the lower right of the positioning surface 62a1 and has a cylindrical shape extending perpendicular to the positioning surface 62a1. The screw hole 62h is located at the center of the positioning surface 62a1 and is threaded so that a screw 69a (see FIG. 3) can be screwed into it.

[0019] As shown in Fig. 6, two positioning pins 62e, 62f and a screw hole 62i are formed on the positioning surface 62b1. The positioning pin 62e is located at the top of the positioning surface 62b1 and has a cylindrical shape extending perpendicular to the positioning surface 62b1. The positioning pin 62f is located at the lower left of the positioning surface 62b1 and has a cylindrical shape extending perpendicular to the positioning surface 62b1. The screw hole 62i is located at the center of the positioning surface 62b1 and is threaded so that a screw 69b (see Fig. 3) can be screwed into it.

[0020] The inner surfaces 62a2, 62b2 are substantially isosceles triangular in shape with their bases aligned along the Z direction, and are inclined in directions away from each other in the upward and front directions. The inner surfaces 62a2, 62b2 are exposed to the optical path.

[0021] Next, the plane mirror unit 20 will be described in detail. 6, the plane mirror unit 20 is formed so as to cover an opening 60c that opens toward the rear of the lower case 60b. The plane mirror unit 20 (more precisely, the rear surface of a mirror support plate 22 described later) is formed so as to be exposed to the outside of the head-up display device 100, as shown in FIG.

[0022] In detail, as shown in FIG. 7, the plane mirror unit 20 includes a plane mirror 28 and a mirror holder 27. The plane mirror 28 is formed by laminating aluminum on a base material made of resin such as polycarbonate. The plane mirror 28 is a trapezoidal plate whose width in the X direction decreases downward. The plane mirror 28 has a mirror surface 28a on its surface that reflects light.

[0023] The mirror holder 27 holds the plane mirror 28 with the center of the mirror surface 28a exposed. The mirror holder 27 is made of synthetic resin, for example, a polymer alloy of polycarbonate (PC) and polyethylene terephthalate (PET). The mirror holder 27 may be made by mixing about 10% glass fiber into the PC / PET polymer alloy to increase its rigidity.

[0024] As shown in FIG. 7, the mirror holder 27 includes a mirror support member 21 and a front frame 25. The mirror support member 21 is located on the rear surface side of the plane mirror 28, and holds the plane mirror 28 together with the front frame 25. In detail, the mirror support member 21 includes a mirror support plate 22 and a pair of protrusions 23a, 23b. The mirror support plate 22 is in the shape of a rectangular plate that is larger than the rear surface of the plane mirror 28 so as to include the rear surface of the plane mirror 28.

[0025] The mirror support plate 22 has four double-sided tape holding recesses 22a, 22b, 22c, and 22d on the surface of the mirror support plate 22. The double-sided tape holding recesses 22a, 22b, 22c, and 22d accommodate double-sided tape 29 for bonding the surface of the mirror support member 21 and the back surface of the plane mirror 28. The double-sided tape holding recess 22a is located at the center in the X direction at the upper end of the mirror support plate 22 and has a rectangular shape that is long in the X direction. The double-sided tape holding recess 22b is located at the center in the X direction at the lower end of the mirror support plate 22 and has a rectangular shape that is long in the X direction. The double-sided tape holding recess 22c is located at the center in the Y direction at the right end of the mirror support plate 22 and has a rectangular shape that is long in the Y direction. The double-sided tape holding recess 22d is located at the center in the Y direction at the left end of the mirror support plate 22 and has a rectangular shape that is long in the Y direction. The double-sided tape holding recess 22a is hidden by a light-shielding wall portion 65 (see FIG. 4). The double-sided tape holding recesses 22b, 22c, and 22d are hidden by the front frame 25. This prevents the double-sided tape 29 from being reflected in the virtual image V.

[0026] 7, the pair of protrusions 23a, 23b are located on the surface of mirror support plate 22 and are aligned along the X direction so as to sandwich plane mirror 28. Protrusion 23a is located on the right side of plane mirror 28, and protrusion 23b is located on the left side of plane mirror 28. Protrusions 23a, 23b have a triangular pyramid shape that protrudes toward the front side, and are formed to fit into protrusions 26a, 26b of front frame 25, which will be described later. The protrusions 23a, 23b include positioning surfaces 23a1, 23b1 located on the front side of the protrusions 23a, 23b, and inner side surfaces 23a2, 23b2 located on the plane mirror 28 side. The inner side surfaces 23a2, 23b2 are inclined downward to approach the center in the X direction of the mirror support plate 22, so as to follow the inclined side surfaces 28b, 28c at both ends in the X direction of the plane mirror 28. The plane mirror 28 is supported by the two inner side surfaces 23a2, 23b2 of the protrusions 23a, 23b. The positioning surfaces 23a1 and 23b1 are generally in the shape of a right-angled triangle, and are formed so that the width in the X direction increases downward and approaches the back side.

[0027] As shown in FIG. 8, the protruding portion 23a includes a hook hole 23e, a screw hole 23f, positioning holes 23g and 23h, and a locking portion 23e1. The hook hole 23e is located at an upper corner of the positioning surface 23a1 and is a through hole forming a rectangle elongated in the Y direction. The hook hole 23e is a hole through which a hook 26e1 (see FIG. 11), which will be described later, passes.

[0028] As shown in Fig. 9, the locking portion 23e1 extends from the edge of the hook hole 23e to the back side. The locking portion 23e1 is locked to a hook 26e1 (see Figs. 3 and 11) described later. As shown in Fig. 8, the screw hole 23f is located in the center of the positioning surface 23a1 and is a circular through hole.

[0029] The positioning hole 23g is located at the lower left of the positioning surface 23a1 and has a bottomed cylindrical shape. The positioning pin 62d (see FIG. 6) of the housing 60 fits into the positioning hole 23g. The positioning hole 23g has a larger diameter than the positioning pin 62d.

[0030] The positioning hole 23h is a circular through hole located above the hook hole 23e in the positioning surface 23a1. The positioning pin 62c (see FIG. 6) of the housing 60 fits into the positioning hole 23h. The positioning hole 23h has the same hole diameter as the positioning pin 62c.

[0031] As shown in FIG. 8, the protruding portion 23b includes a locking portion 23m1, a hook hole 23m, a screw hole 23i, and positioning holes 23j and 23k.

[0032] The hook hole 23m is located at the bottom of the positioning surface 23b2 and has a rectangular shape that is long in the Y direction. The hook hole 23m is a hole through which a hook 26m1 (see FIG. 11), which will be described later, passes. As shown in FIG. 9, the locking portion 23m1 extends from the edge of the hook hole 23m to the back side. The locking portion 23m1 is locked to a hook 26m1 (see FIG. 3 and FIG. 11), which will be described later.

[0033] The screw hole 23i is located at the center of the positioning surface 23b1 and is a circular through-hole. The positioning hole 23k is an elliptical through hole located in the lower part of the positioning surface 23b1, more specifically, to the right of the hook hole 23m. The positioning hole 23k is formed as an elongated hole that is inclined so as to approach the upper direction as it goes rightward. The positioning hole 23j is a bottomed cylinder located above the screw hole 23i in the positioning surface 23b1. A positioning pin 62e (see FIG. 6) fits into the positioning hole 23j. The positioning hole 23j has a larger diameter than the positioning pin 62e.

[0034] (Front frame 25) 7, front frame 25 is located on the front side of mirror support member 21, and covers both ends in the X direction and the lower end of plane mirror 28. In detail, front frame 25 includes a pair of protrusions 26a, 26b, a pair of clamping plate portions 25a, 25b, and a connecting portion 25c. The clamping plates 25a and 25b are substantially in the shape of a right-angled triangle. One of the two orthogonal sides of the clamping plates 25a and 25b is oriented along the X direction, and the other of the two orthogonal sides is oriented along the Y direction. The clamping plates 25a and 25b are arranged along the X direction. The clamping plates 25a and 25b clamp both ends of the plane mirror 28 in the X direction between the clamping plates 25a and 25b and the mirror support member 21. The clamping plate 25a is positioned opposite the right end of the plane mirror 28 in the Z direction, and the clamping plate 25b is positioned opposite the left end of the plane mirror 28 in the Z direction. The clamping plates 25a and 25b also function as a parting material that hides both ends of the plane mirror 28 in the X direction.

[0035] The connecting portion 25c is rod-shaped and extends in the X direction to connect the clamping plates 25a and 25b. The connecting portion 25c connects the lower ends of the clamping plates 25a and 25b, and is located opposite the lower end of the plane mirror 28 in the Z direction. The connecting portion 25c also functions as a parting material that hides the lower end of the plane mirror 28.

[0036] Protrusions 26a, 26b are triangular pyramid-shaped protruding toward the front side, and are positioned so as to be connected to the hypotenuses of clamping plate portions 25a, 25b. Protrusions 26a, 26b are formed so as to avoid the optical path of display light L. As shown in Fig. 11, protrusions 26a, 26b open toward the back side so as to fit protrusions 23a, 23b (see Fig. 8) of mirror support member 21. Protrusion 26a is positioned adjacent to clamping plate portion 25a, and protrusion 26b is positioned adjacent to clamping plate portion 25b.

[0037] As shown in Fig. 10, the protrusions 26a and 26b include positioning surfaces 26a1 and 26b1 located on the front side of the protrusions 26a and 26b, and inner surfaces 26a2 and 26b2 exposed toward the optical path. The positioning surfaces 26a1 and 26b1 are substantially right-angled triangular, and are formed so that their width in the X direction increases downward and approaches the back side. In other words, the positioning surfaces 26a1 and 26b1 are formed so that their width decreases as they proceed in the incident direction Li (see Fig. 5) of the display light L to the mirror surface 28a. As shown in Fig. 5, the incident direction Li extends in an upward direction toward the back side.

[0038] The positioning surfaces 26a1, 26b1 are in surface contact with the positioning surfaces 62a1, 62b1 (see FIGS. 5 and 6) of the support portions 62a, 62b of the housing 60. The inner surfaces 26a2, 26b2 of the protrusions 26a, 26b are located on the same plane that is continuous with the inner surfaces 62a2, 62b2 of the support portions 62a, 62b. This makes it possible to prevent steps from occurring in the optical path, and ultimately improve the display quality of the virtual image V.

[0039] As shown in FIGS. 10 and 11, the protruding portion 26a includes a hook hole 26e, a hook 26e1, a screw hole 26f, and positioning holes 26g and 26h. The hook hole 26e is located in the upper part of the positioning surface 26a1 and has a rectangular shape that is long in the Y direction. The hook 26e1 extends from the edge of the hook hole 26e to the rear side and forms a U-shape that straddles the hook hole 26e. The hook 26e1 is engaged with the engaging portion 23e1 of the mirror support member 21 (see FIGS. 3 and 9).

[0040] The screw hole 26f is a circular through-hole located at the center of the positioning surface 26a1. The screw hole 26f is aligned in the Z direction with the screw hole 23f (see FIG. 8) of the mirror support member 21. The positioning holes 26g and 26h are aligned on the positioning surface 26a1 so as to extend along the inner surface 26a2. Positioning hole 26g is located at the lower left of positioning surface 26a1 and is formed as an elongated hole extending along inner surface 26a2. Positioning pin 62d (see FIG. 6) fits into positioning hole 26g while being aligned in the Z direction with positioning hole 23g (see FIG. 8) of mirror support member 21. By forming positioning hole 26g as an elongated hole, even if shape errors including thermal expansion occur in plane mirror unit 20 or housing 60, positioning pins 62c and 62d can be inserted into positioning holes 26g and 26h.

[0041] The positioning hole 26h is located above the hook hole 26e on the positioning surface 26a1 and is a circular through hole. The positioning pin 62c (see FIG. 6) fits into the positioning hole 26h while being aligned in the Z direction with the positioning hole 23h (see FIG. 8) of the mirror support member 21. The positioning hole 26h has the same hole diameter as the positioning pin 62c.

[0042] As shown in FIGS. 10 and 11, the protruding portion 26b includes a hook hole 26m, a hook 26m1, a screw hole 26i, and positioning holes 26j and 26k.

[0043] The hook hole 26m is located at the bottom of the positioning surface 26b1 and has a square shape. The hook 26m1 extends from the edge of the hook hole 26m to the back side and has a U-shape that straddles the hook hole 26m. The hook 26m1 is engaged with the engaging portion 23m1 of the mirror support member 21 (see FIGS. 3 and 9).

[0044] The screw hole 26i is located at the center of the positioning surface 26b1 and is a circular through-hole. The positioning holes 26j and 26k are aligned on the positioning surface 26b1 so as to extend along the inner surface 26b2. Positioning hole 26k is located at the bottom of positioning surface 26b1, specifically, to the right of hook hole 26m. Positioning hole 26k is formed as an elongated hole extending along inner surface 26b2. Positioning pin 62f (see FIG. 6) fits into positioning hole 26k while being aligned in the Z direction with positioning hole 23k (see FIG. 8) of mirror support member 21. By forming positioning hole 26k as an elongated hole, even if shape errors including thermal expansion occur in plane mirror unit 20 or housing 60, positioning pins 62e, 62f can be inserted into positioning holes 26j, 26k.

[0045] The positioning hole 26j is located above the screw hole 26i in the positioning surface 26b1. The positioning pin 62e fits into the positioning hole 26j in a state aligned with the positioning hole 23j (see FIG. 8) in the Z direction. The positioning holes 26g, 26h, 26j, and 26k of the plane mirror unit 20 are an example of a positioning portion located on the front side of the mirror surface 28a.

[0046] (Assembly Instructions) Next, a description will be given of a method for assembling the plane mirror unit 20. This assembly work is carried out, for example, by a worker. 7, first, double-sided tape 29 is placed in each of double-sided tape holding recesses 22a, 22b, 22c, and 22d of mirror support plate 22. Then, plane mirror 28 is placed on mirror support plate 22 of mirror support member 21. In this way, plane mirror 28 is adhered to mirror support member 21. Next, the front frame 25 is assembled to the mirror support member 21. At this time, the protrusions 23a, 23b of the mirror support member 21 fit into the protrusions 26a, 26b of the front frame 25. Also, at this time, as shown in FIG. 3, the hook 26e1 engages with the locking portion 23e1 of the mirror support member 21. Also, the hook 26m1 engages with the locking portion 23m1 of the mirror support member 21. This fixes the front frame 25 to the mirror support member 21. Therefore, the plane mirror unit 20 is integrated as shown in FIG. 12.

[0047] 6, the plane mirror unit 20 is attached to the supports 62a and 62b of the housing 60. As a result, the positioning pin 62c fits into the positioning holes 23h and 26h, the positioning pin 62d fits into the positioning holes 23g and 26g, the positioning pin 62e fits into the positioning holes 23j and 26j, and the positioning pin 62f fits into the positioning holes 23k and 26k (see FIG. 12). As a result, the plane mirror unit 20 is positioned in the housing 60. 3, screw 69a is screwed into screw holes 23f, 26f of plane mirror unit 20 and screw hole 62h (see FIG. 6) of housing 60. Additionally, screw 69b is screwed into screw holes 23i, 26i of plane mirror unit 20 and screw hole 62i (see FIG. 6) of housing 60. This fixes plane mirror unit 20 to housing 60.

[0048] (effect) According to the embodiment described above, the following effects are achieved.

[0049] (1) The head-up display device 100 includes a display unit 10 that emits display light L, a plane mirror unit 20 that is an example of a mirror unit that reflects the display light L from the display unit 10 toward a windshield 201 that is an example of a projected member, and a housing 60 that has support portions 62a and 62b that hold the plane mirror unit 20. The plane mirror unit 20 includes a plane mirror 28 that is an example of a mirror that includes a mirror surface 28a that reflects the display light L, and a mirror holder 27 that holds the plane mirror 28. The mirror holder 27 is located on the front side of the mirror surface 28a, and includes positioning holes 26g, 26h, 26j, and 26k that are an example of a positioning portion that determines the position of the plane mirror unit 20 relative to the support portions 62a and 62b of the housing 60. According to this configuration, since the positioning portion is located on the front side of the mirror surface 28a, the rear side of the plane mirror unit 20 is prevented from becoming large due to the positioning portion. Therefore, the head-up display device 100 can be made smaller.

[0050] (2) The back surface of the mirror holder 27 is exposed to the outside of the head-up display device 100 . According to this configuration, the housing 60 does not exist on the rear side of the plane mirror unit 20, so that the head-up display device 100 can be made smaller.

[0051] (3) Mirror holder 27 has positioning holes 26g, 26h, 26j, and 26k, and includes a pair of protrusions 26a and 26b that protrude toward the front side of mirror surface 28a and are located on both sides of mirror surface 28a. Protrusions 26a and 26b are formed so that their width decreases as they proceed in the incident direction Li of display light L to mirror surface 28a. According to this configuration, a mirror holder 27 with high strength can be realized by using the dead space in the optical path of the display light L.

[0052] (4) The support portions 62a, 62b of the housing 60 have inner side surfaces 62a2, 62b2 that are an example of a housing inner side surface exposed to the optical path of the display light L. The protrusions 26a, 26b have inner side surfaces 26a2, 26b2 that are formed to be continuous with the inner side surfaces 62a2, 62b2 on the same plane as the inner side surfaces 62a2, 62b2 and are an example of a holder inner side surface exposed to the optical path of the display light L. According to this configuration, the occurrence of a step in the optical path of the display light L can be suppressed, and as a result, the display quality of the virtual image V can be improved.

[0053] (5) The support parts 62a, 62b of the housing 60 have a plurality of positioning pins 62c, 62d, 62e, 62f. The protrusions 26a, 26b are located on the front side of the protrusions 26a, 26b and have positioning surfaces 26a1, 26b1 that are in surface contact with the support parts 62a, 62b, and inner side surfaces 26a2, 26b2 that are inclined with respect to the Y direction, which is the height direction, and are exposed to the optical path of the display light L. The positioning surfaces 26a1, 26b1 are fitted with a plurality of positioning pins 62c, 62d, 62e, 62f, and positioning holes 26h, 26j, which are an example of a first positioning hole, and positioning holes 26g, 26k, which are an example of a second positioning hole, are formed along the inner side surfaces 26a2, 26b2. The positioning holes 26h, 26j are formed by round holes, and the positioning holes 26g, 26k are formed by elongated holes. According to this configuration, since the positioning holes 26g, 26k are formed as elongated holes, even if a shape error or assembly error including thermal expansion occurs in the plane mirror unit 20 or the housing 60, the positioning pins 62c, 62d, 62e, 62f can be inserted into the positioning holes 26g, 26h, 26j, 26k.

[0054] (6) Two positioning holes 26g, 26h, 26j, and 26k are formed in each of the pair of protrusions 26a and 26b. With this configuration, when mirror holder 27 is supported by positioning pins 62c, 62d, 62e, and 62f, the application of force to mirror surface 28a is suppressed, and thus distortion of mirror surface 28a is suppressed.

[0055] The present invention is not limited to the above-described embodiment and drawings. Modifications (including the deletion of components) can be made as appropriate within the scope of the present invention. An example of a modification will be described below.

[0056] (Modification) In the above embodiment, the back surface of the mirror holder 27 is exposed to the outside of the head-up display device 100. However, a wall portion of the housing 60 may be located on the back surface side of the mirror holder 27.

[0057] The plane mirror 28 in the above embodiment may be a concave mirror. The plane mirror 28 may have a mirror surface 28a formed by a free-form surface. The plane mirror 28 is formed in a trapezoidal plate shape, but is not limited thereto and may be formed in a rectangular plate shape, etc.

[0058] Although the protrusions 26a and 26b in the above embodiment are formed in a triangular pyramid shape, the shape is not limited to this and may be a triangular columnar shape, a rectangular columnar shape, a cylindrical shape, or the like. In addition, in the above embodiment, the protrusions 26a, 26b are formed so that the width in the X direction increases toward the downward direction, but they may be formed so that the width in the X direction is the same in the Y direction, or may be formed so that the width in the X direction decreases toward the downward direction.

[0059] In the above embodiment, the positioning parts are the positioning holes 26g, 26h, 26j, and 26k, but they may be positioning pins. In this case, the support parts 62a and 62b are provided with positioning holes instead of the positioning pins 62c, 62d, 62e, and 62f. The positions, numbers, and shapes of the positioning holes and positioning pins can be changed as appropriate. The positioning holes 23g, 23h, 23j, and 23k in the mirror support member 21 in the above embodiment may be omitted. In this case, the positioning pins 62c, 62d, 62e, and 62f are formed short so as to fit only into the positioning holes 26g, 26h, 26j, and 26k in the front frame 25.

[0060] In the above embodiment, the positioning holes 26h and 26j are formed as round holes and the positioning holes 26g and 26k are formed as elongated holes, but conversely, the positioning holes 26h and 26j may be formed as elongated holes and the positioning holes 26g and 26k may be formed as round holes. Also, the positioning holes 26g, 26h, 26j, and 26k may all be formed as round holes or elongated holes.

[0061] In the above embodiment, the inner surfaces 26a2, 26b2 of the protrusions 26a, 26b and the inner surfaces 62a2, 62b2 of the housing 60 are formed on the same plane, but a step may be formed between the inner surfaces 26a2, 26b2 and the inner surfaces 62a2, 62b2.

[0062] In the above embodiment, the head-up display device 100 is mounted on the vehicle 200, but 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.

[0063] In the above embodiment, the display unit 10 is located below the plane mirror unit 20, but this is not limiting and the display unit 10 may be located above the plane mirror unit 20. In this case, the plane mirror unit 20 may be provided upside down. As a result, the width of the positioning surfaces 23a1, 23b1, 26a1, and 26b1 in the X direction decreases downward. [Explanation of symbols]

[0064] 10 Display section 20 Plane mirror unit 21 Mirror support member 22 Mirror support plate 22a, 22b, 22c, 22d Double-sided tape holding recess 23a, 23b, 26a, 26b protrusion 23a1, 23b1, 26a1, 26b1 Positioning surface 23a2,23b2,26a2,26b2 Inner surface 23e, 23m, 26e, 26m Hook hole 23e1,23m1 Locking part 23f, 23i, 26f, 26i, 62h, 62i screw holes 23g, 23h, 23j, 23k, 26g, 26h, 26j, 26k Positioning holes 25 Front Frame 25a, 25b Holding plate part 25c connection part 26e1,26m1 hook 27 Mirror Holder 28 plane mirror 28a Mirror surface 28b,28c Slanted side 29 Double-sided tape 30 concave mirror 40 Concave mirror drive unit 50 Window 60 Case 60a Upper case 60b Lower case 60c,61 opening 62a,62b Support part 62a1, 62b1 Positioning surface 62a2,62b2 Inner side 62c, 62d, 62e, 62f Locating pins 65 Shading wall 69a,69b Bis 100 Head-up display device 200 vehicles 201 Windshield

Claims

[Claim 1] A display unit that emits display light; a mirror unit that reflects the display light from the display unit toward a projection member; a housing having a support portion for holding the mirror unit, The mirror unit includes: a mirror including a mirror surface that reflects the display light; A mirror holder for holding the mirror; Equipped with the mirror holder is located on the front side of the mirror surface and includes a positioning portion that determines a position of the mirror unit relative to the support portion of the housing; the mirror holder has the positioning portion and is provided with a pair of protrusions having a substantially triangular pyramid shape protruding toward the front side of the mirror surface, the protrusions form the positioning portions, and a surface located on the front side of each of the protrusions serves as a positioning surface that comes into contact with the support portion; The positioning surface is When the direction in which the display light is reflected by the mirror surface is defined as a reflection direction, and the direction perpendicular to the reflection direction and along the mirror surface is defined as a width direction, The shape includes an upper side and a bottom side that are formed along the width direction, The upper side is shorter than the bottom side and is located on the reflection direction side of the bottom side. Head-up display device.

Images