JP7415935B2 - heads up display device - Google Patents

Description

The present invention relates to a head-up display device.

2. Description of the Related Art Head-up display devices that display a virtual image by irradiating display light onto a windshield or the like have been known. For example, a head-up display device described in Patent Document 1 includes a plane mirror that reflects display light, a holder that holds the plane mirror, and a support section that supports the holder from the back side.

JP2017-171041A

The holder described in Patent Document 1 is supported by a support portion from the back side. This has led to an increase in the size of the back side of the holder and, in turn, to an increase in the size of the head-up display device.

The present invention has been made in view of the above-mentioned circumstances, and an object of the present invention is to provide a head-up display device that can be miniaturized.

In order to achieve the above object, a head-up display device according to an aspect of the present invention includes: a display section that emits display light; a mirror unit that reflects the display light from the display section toward a member to be projected; a casing having a support portion that holds a mirror unit; the mirror unit includes a mirror including a mirror surface that reflects the display light; and a mirror holder that holds the mirror; the mirror holder includes: The mirror holder includes a positioning part that is located on the front side of the mirror surface and that determines the position of the mirror unit with respect to the support part of the casing, and the mirror holder has the positioning part and is located on the front side with respect to the mirror surface. a pair of protrusions that protrude and are located on both sides of the mirror surface, each of the protrusions having a width direction extending in a direction perpendicular to the direction in which the display light is reflected on the mirror surface and in which the paired protrusions form a pair. In this case, the width in the width direction is formed to become smaller as it advances in the reflection direction .

According to the present invention, it is possible to reduce the size of a head-up display device.

1 is a schematic diagram of a vehicle equipped with a head-up display device according to an embodiment of the present invention. 1 is a schematic diagram of a head-up display device according to an embodiment of the present invention. 1 is a perspective view of a head-up display device according to an embodiment of the present invention. 1 is a perspective view of a head-up display device according to an embodiment of the present invention. FIG. 1 is a perspective view of a head-up display device with an upper case removed according to an embodiment of the present invention. FIG. 1 is a perspective view showing a plane mirror unit and a housing according to an embodiment of the present invention. FIG. 1 is an exploded perspective view of a plane mirror unit according to an embodiment of the present invention. FIG. 2 is a perspective view of a mirror support member according to an embodiment of the present invention. FIG. 2 is a perspective view of a mirror support member according to an embodiment of the present invention. FIG. 2 is a perspective view of a front frame according to an embodiment of the present invention. FIG. 2 is a perspective view of a front frame according to an embodiment of the present invention. FIG. 1 is a perspective view of a plane mirror unit according to an embodiment of the present invention.

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

As shown in FIG. 1, head-up display device 100 is installed within the dashboard of vehicle 200. The head-up display device 100 emits display light L representing an image toward a windshield 201, which is an example of a projected member of the vehicle 200. The display light L is reflected by the windshield 201 and reaches the viewer 1 (mainly the driver of the vehicle 200). Thereby, the virtual image V is displayed so as to be visible to the viewer 1.

As shown in FIG. 2, the head-up display device 100 includes a display section 10, a plane mirror unit 20, a concave mirror 30, a concave mirror drive unit 40, and a housing 60.
In the following description, left and right, top and bottom, and front and back are defined based on the direction when the mirror surface 28a of the plane mirror unit 20 is viewed from the front. In FIGS. 3 to 12, the left side is abbreviated as Lf, the right side is abbreviated as Rt, the top side is abbreviated as Up, the bottom side is abbreviated as Dn, the front side is abbreviated as Fr, and the back side is abbreviated as Bk. . Further, the left-right direction corresponds to the X direction, the up-down direction corresponds to the Y-direction, and the front-back direction corresponds to the Z-direction.

As shown in FIG. 2, the display section 10 emits display light L representing an image under the control of a control section (not shown). The display unit 10 includes, for example, a light source and a liquid crystal display panel, both of which are not shown.

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

As shown in FIGS. 2 and 5, the concave mirror 30 is formed into 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 depositing a metal reflective material such as aluminum on a synthetic resin base material having a concave curved surface. The concave mirror 30 magnifies and reflects the display light L reflected by the plane mirror unit 20 toward the windshield 201. Further, the concave mirror 30 is configured to be rotatable by a concave mirror drive unit 40 around a rotation axis Ax extending in a direction perpendicular to the plane of the paper in FIG.
The concave mirror drive unit 40 rotates the concave mirror 30 around the rotation axis Ax.

As shown in FIGS. 2 and 3, the housing 60 is made of non-transparent resin or metal and has a hollow, substantially rectangular parallelepiped shape. Each component of the head-up display device 100 is housed within the housing 60. The housing 60 includes a box-shaped lower case 60b that opens upward, and an upper case 60a that closes the opening of the lower case 60b. An opening 61 is formed in the upper case 60a at a position facing the windshield 201. The upper case 60a includes a curved plate-shaped window 50 that closes the opening 61. The window portion 50 is made of a translucent resin such as acrylic through which the display light L passes.

As shown in FIG. 4, the upper case 60a includes a light-shielding wall portion 65 located at the edge of the opening 61 and made of light-shielding resin. The light shielding wall portion 65 has a rectangular plate shape that is long in the X direction. The lower end of the light shielding wall 65 overlaps the upper end of the mirror surface 28a of the plane mirror unit 20 in the Z direction. Thereby, the upper end of the mirror surface 28a is hidden by the light-shielding wall portion 65. The light shielding wall portion 65 has a function of suppressing stray light from entering the optical path of the display light L in addition to a function as a parting member that hides the upper end of the mirror surface 28a.

As shown in FIG. 6, the lower case 60b has a box shape that opens upward and toward the back. The lower case 60b includes support parts 62a and 62b that support the plane mirror unit 20. The support parts 62a and 62b have a triangular pyramid shape and are arranged along the X direction so as to sandwich the optical path of the display light L between the display part 10 and the plane mirror unit 20. The support parts 62a and 62b each include positioning surfaces 62a1 and 62b1 located on the back side of the support parts 62a and 62b, and inner surfaces 62a2 and 62b2 located on the optical path side. The positioning surfaces 62a1 and 62b1 have a substantially right triangular shape with the base extending in the X direction, and are inclined toward the back side as they go upward.

Two positioning pins 62c, 62d and a screw hole 62h are formed in the positioning surface 62a1. The positioning pin 62c is located above the positioning surface 62a1 and has a cylindrical shape extending perpendicularly to the positioning surface 62a1. The positioning pin 62d is located on the lower right side of the positioning surface 62a1, and has a cylindrical shape extending perpendicularly 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 the screw hole 62h.

As shown in FIG. 6, two positioning pins 62e and 62f and a screw hole 62i are formed in the positioning surface 62b1. The positioning pin 62e is located above the positioning surface 62b1 and has a cylindrical shape extending perpendicularly 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 perpendicularly 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 the screw hole 62i.

The inner surfaces 62a2 and 62b2 have a substantially isosceles triangular shape with the base along the Z direction, and are inclined away from each other as they go upward and toward the front. The inner surfaces 62a2 and 62b2 are exposed toward the optical path.

Next, the plane mirror unit 20 will be explained in detail.
As shown in FIG. 6, the plane mirror unit 20 is formed to close an opening 60c opening toward the back of the lower case 60b. The plane mirror unit 20 (more precisely, the back surface of the 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.

Specifically, 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, for example. The plane mirror 28 has a trapezoidal plate shape whose width in the X direction decreases as it goes downward. The plane mirror 28 includes a mirror surface 28a that reflects light on the surface of the plane mirror 28.

The mirror holder 27 holds the plane mirror 28 with the central portion of the mirror surface 28a exposed. The mirror holder 27 is formed using a synthetic resin, for example, a polymer alloy of polycarbonate (PC) and polyethylene terephthalate (PET). Further, the mirror holder 27 may be formed by mixing about 10% glass fiber with this PC/PET polymer alloy, for example, in order to increase its rigidity.

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 back side of the plane mirror 28 and holds the plane mirror 28 together with the front frame 25. Specifically, the mirror support member 21 includes a mirror support plate 22 and a pair of protrusions 23a and 23b. The mirror support plate 22 has a rectangular plate shape that is larger than the back surface of the plane mirror 28 so as to include the back surface of the plane mirror 28.

The mirror support plate 22 has four double-sided tape holding recesses 22a, 22b, 22c, and 22d on the surface thereof. A double-sided tape 29 for bonding the front surface of the mirror support member 21 and the back surface of the plane mirror 28 is accommodated in the double-sided tape holding recesses 22a, 22b, 22c, and 22d. 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 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.

As shown in FIG. 7, the pair of protrusions 23a and 23b are located on the surface of the mirror support plate 22 and lined up along the X direction so as to sandwich the plane mirror 28 therebetween. The protrusion 23a is located on the right side of the plane mirror 28, and the protrusion 23b is located on the left side of the plane mirror 28. The protrusions 23a and 23b have a triangular pyramid shape that protrudes toward the front side, and are formed to fit into protrusions 26a and 26b of the 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 surfaces 23a2, 23b2 located on the plane mirror 28 side. The inner surfaces 23a2 and 23b2 are inclined downward toward the center of the mirror support plate 22 in the X direction along the inclined side surfaces 28b and 28c on both ends of the plane mirror 28 in the X direction. The plane mirror 28 is supported by the two inner surfaces 23a2 and 23b2 of the protrusions 23a and 23b.
The positioning surfaces 23a1 and 23b1 have a substantially right-angled triangular shape, and are formed so that the width in the X direction increases toward the bottom and approaches the back side.

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 a through hole located at the upper corner of the positioning surface 23a1 and having a long rectangular shape 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.

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), which will be described later. As shown in FIG. 8, the screw hole 23f is a circular through hole located at the center of the positioning surface 23a1.

The positioning hole 23g is located at the lower left of the positioning surface 23a1 and has a cylindrical shape with a bottom. A 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.

The positioning hole 23h is a circular through hole located above the hook hole 23e on the positioning surface 23a1. A 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.

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.

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 FIGS. 3 and 11), which will be described later.

The screw hole 23i is a circular through hole located at the center of the positioning surface 23b1.
The positioning hole 23k is an elliptical through hole located at the lower part of the positioning surface 23b1, specifically, on the right side of the hook hole 23m. The positioning hole 23k is formed as a long hole that is inclined upward toward the right side.
The positioning hole 23j has a cylindrical shape with a bottom and is located above the screw hole 23i on 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.

(Front frame 25)
As shown in FIG. 7, the front frame 25 is located on the front side of the mirror support member 21 and covers both ends and the lower end of the plane mirror 28 in the X direction. Specifically, the front frame 25 includes a pair of protrusions 26a and 26b, a pair of clamping plate parts 25a and 25b, and a connecting part 25c.
The holding plate portions 25a and 25b have a substantially right triangular plate shape. The holding plate portions 25a and 25b are substantially right-angled triangles, with one of the two orthogonal sides oriented along the X direction, and the other of the two orthogonal sides oriented along the Y direction. The holding plate parts 25a and 25b are arranged along the X direction. The holding plate parts 25a and 25b hold both ends of the plane mirror 28 in the X direction between them and the mirror support member 21. The holding plate part 25a is located opposite the right end of the plane mirror 28 in the Z direction, and the holding plate part 25b is located opposite the left end of the plane mirror 28 in the Z direction. The holding plate portions 25a and 25b also function as parting members that hide both ends of the plane mirror 28 in the X direction.

The connecting portion 25c has a rod shape extending in the X direction so as to connect the holding plate portions 25a and 25b. The connecting portion 25c connects the lower ends of the holding plate portions 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 member that hides the lower end of the plane mirror 28.

The protrusions 26a, 26b have a triangular pyramid shape that protrudes toward the front side, and are located so as to be connected to the oblique sides of the holding plate parts 25a, 25b. The protrusions 26a and 26b are formed so as to avoid the optical path of the display light L. As shown in FIG. 11, the protrusions 26a and 26b open toward the back side so that the protrusions 23a and 23b (see FIG. 8) of the mirror support member 21 fit therein. The protruding part 26a is located adjacent to the clamping plate part 25a, and the protruding part 26b is located adjacent to the clamping plate part 25b.

As shown in FIG. 10, the protrusions 26a, 26b include positioning surfaces 26a1, 26b1 located on the front side of the protrusions 26a, 26b, and inner surfaces 26a2, 26b2 exposed toward the optical path. The positioning surfaces 26a1 and 26b1 have a substantially right triangular shape, and are formed so that the width in the X direction becomes larger toward the bottom and closer to the back side. In other words, the positioning surfaces 26a1 and 26b1 are formed so that the width becomes smaller as the positioning surfaces 26a1 and 26b1 proceed in the incident direction Li (see FIG. 5) of the display light L with respect to the mirror surface 28a. As shown in FIG. 5, the incident direction Li extends upward toward the back side.

The positioning surfaces 26a1 and 26b1 are in surface contact with the positioning surfaces 62a1 and 62b1 (see FIGS. 5 and 6) of the support parts 62a and 62b of the housing 60. Inner surfaces 26a2, 26b2 of the protrusions 26a, 26b are located on the same continuous plane as the inner surfaces 62a2, 62b2 of the supports 62a, 62b. Thereby, it is possible to suppress the occurrence of a step in the optical path, and in turn, it is possible to improve the display quality of the virtual image V.

As shown in FIGS. 10 and 11, the protrusion 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 at 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 back side, and has a U-shape that straddles the hook hole 26e. The hook 26e1 is locked to a locking portion 23e1 of the mirror support member 21 (see FIGS. 3 and 9).

The screw hole 26f is a circular through hole located at the center of the positioning surface 26a1. The screw hole 26f is located in line with the screw hole 23f of the mirror support member 21 (see FIG. 8) in the Z direction.
The positioning holes 26g and 26h are arranged on the positioning surface 26a1 along the inner surface 26a2.
The positioning hole 26g is located at the lower left of the positioning surface 26a1 and is formed as a long hole extending along the inner surface 26a2. The positioning pin 62d (see FIG. 6) fits into the positioning hole 26g in a state where it is lined up in the Z direction with the positioning hole 23g (see FIG. 8) of the mirror support member 21. Since the positioning holes 26g are formed as elongated holes, the positioning pins 62c and 62d can be inserted into the positioning holes 26g and 26h even if a shape error including thermal expansion occurs in the plane mirror unit 20 or the housing 60. It becomes possible.

The positioning hole 26h is a circular through hole located above the hook hole 26e on the positioning surface 26a1. The positioning pin 62c (see FIG. 6) fits into the positioning hole 26h in a state where it is lined up 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.

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

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 locked to a locking portion 23m1 (see FIGS. 3 and 9) of the mirror support member 21.

The screw hole 26i is a circular through hole located at the center of the positioning surface 26b1.
The positioning holes 26j and 26k are arranged on the positioning surface 26b1 along the inner surface 26b2.
The positioning hole 26k is located at the lower part of the positioning surface 26b1, specifically, on the right side of the hook hole 26m. The positioning hole 26k is formed as a long hole extending along the inner surface 26b2. The positioning pin 62f (see FIG. 6) fits into the positioning hole 26k in a state where it is aligned with the positioning hole 23k (see FIG. 8) of the mirror support member 21 in the Z direction. By forming the positioning holes 26k as elongated holes, even if a shape error including thermal expansion occurs in the plane mirror unit 20 or the housing 60, the positioning pins 62e and 62f can be inserted into the positioning holes 26j and 26k. It becomes possible.

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

(Assembling method)
Next, a method for assembling the plane mirror unit 20 will be explained. This assembly work is performed by, for example, a worker.
As shown in FIG. 7, double-sided tapes 29 are first placed in the double-sided tape holding recesses 22a, 22b, 22c, and 22d of the mirror support plate 22, respectively. Then, the plane mirror 28 is installed on the mirror support plate 22 of the mirror support member 21. Thereby, the plane mirror 28 is adhered to the mirror support member 21.
Next, the front frame 25 is assembled to the mirror support member 21. At this time, the protrusions 23a and 23b of the mirror support member 21 fit into the protrusions 26a and 26b of the front frame 25. Moreover, at this time, as shown in FIG. 3, the hook 26e1 is locked to the locking portion 23e1 of the mirror support member 21. Further, the hook 26m1 is locked to the locking portion 23m1 of the mirror support member 21. Thereby, the front frame 25 is fixed to the mirror support member 21. Therefore, as shown in FIG. 12, the plane mirror unit 20 is integrated.

Then, as shown in FIG. 6, the plane mirror unit 20 is attached to the support parts 62a and 62b of the housing 60. As a result, the locating pin 62c is inserted into the locating holes 23h and 26h, the locating pin 62d is inserted into the locating holes 23g and 26g, the locating pin 62e is inserted into the locating holes 23j and 26j, and the locating pin 62f is inserted into the locating holes 23k and 26k (see FIG. 12). fit into each. Thereby, the plane mirror unit 20 is positioned in the housing 60.
Finally, as shown in FIG. 3, the screws 69a are inserted into the screw holes 23f, 26f of the plane mirror unit 20 and the screw holes 62h of the housing 60 (see FIG. 6). Further, the screws 69b are inserted into the screw holes 23i, 26i of the plane mirror unit 20 and the screw holes 62i (see FIG. 6) of the housing 60. Thereby, the plane mirror unit 20 is fixed to the housing 60.

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

(1) The head-up display device 100 is an example of a display unit 10 that emits display light L and 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. It includes a certain plane mirror unit 20 and a casing 60 having support parts 62a and 62b that hold the plane mirror unit 20. The plane mirror unit 20 includes a plane mirror 28, which is an example of a mirror including 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 includes positioning holes 26g, 26h, 26j, and 26k that are located on the front side of the mirror surface 28a and are examples of positioning parts for determining the position of the plane mirror unit 20 with respect to the support parts 62a and 62b of the housing 60.
According to this configuration, since the positioning part is located on the front side of the mirror surface 28a, the positioning part prevents the back side of the plane mirror unit 20 from increasing in size. Therefore, the head-up display device 100 can be made smaller.

(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, since the housing 60 is not present on the back side of the plane mirror unit 20, the head-up display device 100 can be downsized.

(3) The 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 the mirror surface 28a and are located on both sides of the mirror surface 28a. The protrusions 26a and 26b are formed so that their widths become smaller as they advance in the incident direction Li of the display light L with respect to the mirror surface 28a.
According to this configuration, it is possible to realize a mirror holder 27 with high strength by using the dead space in the optical path of the display light L.

(4) The support parts 62a and 62b of the housing 60 include inner surfaces 62a2 and 62b2, which are examples of inner side surfaces of the housing that are exposed to the optical path of the display light L. The protrusions 26a, 26b are formed on the same plane as the inner surfaces 62a2, 62b2 so as to be continuous with the inner surfaces 62a2, 62b2, and the inner surfaces 26a2, 26b are an example of the holder inner surface exposed to the optical path of the display light L. 26b2.
According to this configuration, it is possible to suppress the occurrence of a step in the optical path of the display light L, and thereby the display quality of the virtual image V can be improved.

(5) The support parts 62a and 62b of the housing 60 have a plurality of positioning pins 62c, 62d, 62e, and 62f. The protruding parts 26a, 26b are located on the front side of the protruding parts 26a, 26b, and have positioning surfaces 26a1, 26b1 that are in surface contact with the supporting parts 62a, 62b, and are inclined with respect to the Y direction, which is the height direction, and display light L. and inner surfaces 26a2 and 26b2 exposed to the optical path. A plurality of positioning pins 62c, 62d, 62e, 62f fit into the positioning surfaces 26a1, 26b1, and positioning holes 26h, 26j, which are examples of first positioning holes, and second positioning holes lined up along the inner surfaces 26a2, 26b2. Positioning holes 26g and 26k, which are examples of positioning holes, are formed. 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 and 26k are formed as elongated holes, even if a shape error including thermal expansion or an assembly error occurs in the plane mirror unit 20 or the housing 60, the positioning pin 62c , 62d, 62e, and 62f can be inserted into the positioning holes 26g, 26h, 26j, and 26k.

(6) Two positioning holes 26g, 26h, 26j, and 26k are formed in each of the pair of protrusions 26a and 26b. According to this configuration, when the mirror holder 27 is supported by the positioning pins 62c, 62d, 62e, and 62f, force is suppressed from being applied to the mirror surface 28a, thereby suppressing distortion of the mirror surface 28a.

Note that the present invention is not limited to the above embodiments and drawings. It is possible to make changes (including deletion of constituent elements) as appropriate without changing the gist of the present invention. An example of the modification will be described below.

(Modified example)
In the embodiment described above, the back surface of the mirror holder 27 was exposed to the outside of the head-up display device 100, but the wall portion of the housing 60 may be located on the back surface side of the mirror holder 27.

The plane mirror 28 in the above embodiment may be a concave mirror. Further, the plane mirror 28 may have a mirror surface 28a formed by a free-form surface. Furthermore, although the plane mirror 28 is formed in the shape of a trapezoidal plate, it is not limited to this, and may be formed in the shape of a rectangular plate or the like.

Although the protrusions 26a and 26b in the above embodiment are formed in the shape of a triangular pyramid, they are not limited to this, and may be formed in the shape of a triangular column, a rectangular column, a cylinder, or the like.
Furthermore, in the above embodiment, the protrusions 26a and 26b are formed so that the width in the X direction increases as they go downward, but they are formed so that the width in the X direction becomes the same in the Y direction. Alternatively, the width in the X direction may become smaller as it goes downward.

In the above embodiment, the positioning portions are the positioning holes 26g, 26h, 26j, and 26k, but are not limited thereto, and may be positioning pins. In this case, positioning holes are provided in the support parts 62a, 62b instead of the positioning pins 62c, 62d, 62e, 62f. Furthermore, 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 of 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 that they fit only into the positioning holes 26g, 26h, 26j, and 26k of the front frame 25.

In the embodiment described above, the positioning holes 26h, 26j are formed by round holes, and the positioning holes 26g, 26k are formed by elongated holes.On the contrary, the positioning holes 26h, 26j are formed by elongated holes, and the positioning holes 26g and 26k may be formed by round holes. Further, the positioning holes 26g, 26h, 26j, and 26k may all be formed as round holes or elongated holes.

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 the inner surfaces 26a2, 26b2 and the inner surfaces 62a2, 62b2 are formed on the same plane. A step may be formed between them.

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. Further, the projection member is not limited to the windshield, and may be a dedicated combiner.

In the embodiment described above, the display section 10 is located below the plane mirror unit 20, but the display section 10 is not limited to this, and 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 becomes smaller as they move downward.

10 Display section 20 Plane mirror unit 21 Mirror support member 22 Mirror support plates 22a, 22b, 22c, 22d Double-sided tape holding recesses 23a, 23b, 26a, 26b Projections 23a1, 23b1, 26a1, 26b1 Positioning surfaces 23a2, 23b2, 26a2, 26b2 Inner surface 23e, 23m, 26e, 26m Hook hole 23e1, 23m1 Locking part 23f, 23i, 26f, 26i, 62h, 62i Screw hole 23g, 23h, 23j, 23k, 26g, 26h, 26j, 26k Positioning hole 25 Front frame 25a, 25b Holding plate portion 25c Connecting portions 26e1, 26m1 Hook 27 Mirror holder 28 Plane mirror 28a Mirror surfaces 28b, 28c Slanted side surface 29 Double-sided tape 30 Concave mirror 40 Concave mirror drive unit 50 Window portion 60 Housing 60a Upper case 60b Lower case 60c, 61 Opening Portions 62a, 62b Support portions 62a1, 62b1 Positioning surfaces 62a2, 62b2 Inner surfaces 62c, 62d, 62e, 62f Positioning pins 65 Light shielding wall portions 69a, 69b Screws 100 Head-up display device 200 Vehicle 201 Windshield

Claims (1)

a display section that emits display light;
a mirror unit that reflects the display light from the display section toward a projected member;
a casing having a support portion that holds the mirror unit;
The mirror unit is
a mirror including a mirror surface that reflects the display light;
a mirror holder that holds the mirror;
Equipped with
The mirror holder includes a positioning part that is located on the front side of the mirror surface and determines the position of the mirror unit with respect to the support part of the housing,
The mirror holder has the positioning part, a pair of protrusions that protrude toward the front side of the mirror surface, and are located on both sides of the mirror surface,
Each of the protrusions has a width in the width direction that is perpendicular to the direction in which the display light is reflected on the mirror surface, and when the direction in which the protrusions form a pair is defined as the width direction, the width in the width direction advances in the reflection direction. formed to become smaller as the
Head-up display device.

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