Head-up display device

Abstract

A head-up display device is provided that can be made lighter while improving heat resistance against light concentration. [Solution] The head-up display device 10 comprises a display 14 that emits display light L, a correction mirror 11 that reflects the display light L so that the upper and lower ends thereof intersect, a concave mirror 12 that reflects the display light L so that it is projected outside the head-up display device 10, a case 30 that houses the display 14, the correction mirror 11, and the concave mirror 12, has an opening 36a through which the display light L passes, and is made of synthetic resin, and a blind cover 40 that is installed on the inner bottom surface 35b of the case 30 and is made of metal and forms an optical path space S through which the display light L travels within the case 30.

Description

[Technical Field]

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

[0002] The head-up display device described in Patent Document 1 includes a first mirror, a second mirror, and a case that houses the first and second mirrors, and a cross optical path is formed between the first and second mirrors. In a head-up display device that forms this cross optical path, the temperature tends to increase due to the concentration of sunlight inside the case. For this reason, the center frame and upper cover of the case are made of metal from the viewpoint of heat resistance (see paragraphs 0034 and 0037 of Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent No. 6769481 Summary of the Invention [Problem to be solved by the invention]

[0004] In the configuration described in Patent Document 1, the case is made of metal, which improves the heat resistance of the head-up display device but increases its weight.On the other hand, if the case is made of resin, the weight of the head-up display device can be reduced but the heat resistance due to light concentration is low.

[0005] The present disclosure has been made in consideration of the above-described circumstances, and aims to provide a head-up display device that can be made lighter while improving heat resistance against light concentration. [Means for solving the problem]

[0006] In order to achieve the above object, a head-up display device according to the present disclosure includes: a display that emits a display light; a correction mirror that reflects the upper and lower ends of the display light so as to intersect; a concave mirror that reflects the display light so as to project it outside the head-up display device; a case made of synthetic resin that houses the display, the correction mirror, and the concave mirror, and has an opening through which the display light passes; The display device further includes a blind cover that is installed on the inner bottom surface of the case and is made of metal to form an optical path space through which the display light travels within the case. [Effects of the Invention]

[0007] According to the present disclosure, it is possible to improve heat resistance against light concentration while reducing weight. [Brief explanation of the drawings]

[0008] [Figure 1] 1 is a schematic cross-sectional view of a head-up display device according to an embodiment of the present disclosure. [Figure 2] 1 is a perspective view of a head-up display device according to an embodiment of the present disclosure with an upper case portion removed; [Figure 3] 1 is a perspective view of a head-up display device according to an embodiment of the present disclosure with an upper case portion removed; [Figure 4] FIG. 1 is a perspective view of a blind cover and a correction mirror according to an embodiment of the present disclosure. [Figure 5] FIG. 1 is a perspective view of a blind cover according to one embodiment of the present disclosure. [Figure 6] FIG. 1 is a perspective view of a blind cover according to one embodiment of the present disclosure. [Figure 7] FIG. 1 is a perspective view of a blind cover according to one embodiment of the present disclosure. [Figure 8] FIG. 8 is a cross-sectional view taken along line VIII-VIII in FIG. [Figure 9] FIG. 1 is a perspective view of a blind cover according to one embodiment of the present disclosure. [Figure 10]1 is a plan view of a state in which a blind cover shown as transparent according to one embodiment of the present disclosure is installed in a lower case portion. FIG. DETAILED DESCRIPTION OF THE INVENTION

[0009] A head-up display device according to an embodiment of the present disclosure will be described with reference to the drawings. 1, a head-up display device 10 is mounted on a vehicle and displays a projection image as a virtual image including vehicle information by projecting display light L onto a windshield 19, which is an example of a projection target member. In the following description, the height direction of the vehicle is defined as the Y direction, the width direction of the vehicle is defined as the X direction, and the front-to-rear direction of the vehicle is defined as the Z direction.

[0010] The head-up display device 10 includes a correction mirror 11, which is an example of a fixed mirror, a concave mirror 12, which is an example of a rotating mirror, a case 30, an illumination unit 13, a display 14, a control board 15, and a mirror rotation drive unit 18.

[0011] The illumination unit 13 emits illumination light toward the display 14 under the control of the control board 15. The illumination unit 13 includes, for example, a plurality of LEDs (Light Emitting Diodes). The display 14 receives illumination light from the illumination unit 13 and emits display light L that displays an image. The display 14 is, for example, a TFT (Thin Film Transistor) type liquid crystal display panel.

[0012] The control board 15 controls the lighting unit 13, the display 14, and the mirror rotation drive unit 18. The control board 15 includes a CPU (Central Processing Unit), a GDC (Graphic Display Controller), a ROM (Read Only Memory), a RAM (Random Access Memory), etc. The control board 15 receives vehicle information from an external source, and causes the display 14 to display an image including the vehicle information, and then radiates illumination light from the lighting unit 13 toward the display 14.

[0013] As shown in FIG. 1, the correction mirror 11 reflects the display light L from the display 14 toward the concave mirror 12. The correction mirror 11 has a reflective surface 11a, which is a free-form surface that corrects distortion of the virtual image due to the shape of the windshield 19. The reflective surface 11a of the correction mirror 11 faces diagonally downward and forward of the vehicle. The reflective surface 11a causes the upper and lower ends of the reflected display light L to cross at a cross point CP. The cross point CP is located between the correction mirror 11 and the concave mirror 12, and more specifically, is located closer to the correction mirror 11 than the midpoint between the correction mirror 11 and the concave mirror 12. The curvatures of the reflective surface 11a of the correction mirror 11 and the reflective surface 12a of the concave mirror 12 are larger in a cross optical system that crosses the display light L compared to a configuration that does not cross the display light L. As the curvatures of the reflective surfaces 11a and 12a increase, sunlight concentration becomes more pronounced.

[0014] As shown in Fig. 4, the correction mirror 11 has three pressed portions 11L, 11R, and 11C. The two pressed portions 11L and 11R are formed in a convex shape on both side surfaces of the correction mirror 11 in the X direction. Each of the pressed portions 11L and 11R has a substantially cylindrical shape extending in the X direction. The pressed portion 11C is formed in a convex shape on the lower side surface of the correction mirror 11.

[0015] As shown in FIG. 1, the concave mirror 12 has a reflecting surface 12a that reflects the display light L from the correction mirror 11 toward the windshield 19. The reflecting surface 12a faces diagonally upward toward the rear of the vehicle. The concave mirror 12 is, for example, a concave mirror. The lower end face of the concave mirror 12 extends along the X direction, is located at the lowest position in the center in the X direction, and curves upward as it moves from the center toward the outside in the X direction. Both ends of the concave mirror 12 on the rotation axis Ax are supported in the case 30 so as to be rotatable about the rotation axis Ax. 2, concave mirror 12 is formed to be long in the X direction, and the size of concave mirror 12 in the X direction is formed to be larger than the size of correction mirror 11 in the X direction. Concave mirror 12 and correction mirror 11 face each other in the Z direction, and the center position of correction mirror 11 in the X direction is located closer to a side wall portion 45R, which will be described later, in the X direction than the center position of concave mirror 12 in the X direction.

[0016] 1, the mirror rotation drive unit 18 rotates the concave mirror 12 about the rotation axis Ax under the control of the control board 15. When the concave mirror 12 rotates about the rotation axis Ax, the irradiation position of the display light L with respect to the viewer can be adjusted in the Z direction.

[0017] The case 30 includes a lower case portion 35, an upper case portion 36, and a lower cover portion 37. Each portion of the case 30 is formed from a light-blocking resin.

[0018] The lower case section 35 is box-shaped and opens upward, and houses a blind cover 40, a correction mirror 11, a concave mirror 12, and a mirror rotation drive section 18. The lighting section 13, a display 14, and a control board 15 are installed on the outer bottom surface of the lower case section 35. The lower cover portion 37 is attached to the outer bottom surface side of the lower case portion 35 so as to cover the lighting portion 13 and the display device 14 .

[0019] The upper case part 36 is attached to the upper part of the lower case part 35 so as to close the opening that opens to the upper side of the lower case part 35. The upper case part 36 is formed in a frame shape having an opening part 36a through which the display light L passes from the concave mirror 12 toward the windshield 19. The opening part 36a of the upper case part 36 is closed by a light-transmitting plate part 36b that transmits light including the display light L.

[0020] The blind cover 40 is provided inside the case 30 and forms an optical path space S through which the display light L travels within the case 30. The blind cover 40 hides structures and shapes (e.g., the rib structure formed inside the case 30 and the mirror rotation drive unit 18) that may cause stray light from the optical path space S. The blind cover 40 is integrally formed from metal. While general metals or light metals can be used as the metal, light metals such as aluminum alloys or magnesium alloys are more preferable. The blind cover 40 is formed to cover the area where parallel light such as sunlight that may enter through the opening 36a of the case 30 is focused by the concave mirror 12. The blind cover 40 is formed by a method such as casting, die casting, punching, or bending, but may also be formed by other methods.

[0021] As shown in Figures 2 and 3, the blind cover 40 comprises a bottom plate portion 41, extension portions 43L, 43R, a pair of side wall portions 45L, 45R, a light-shielding wall 48, an opening tube portion 42, and as shown in Figure 6, a mirror mounting frame portion 47, receiving portions 44L, 44R, 44C, and a light-entering tube portion 49.

[0022] 3 and 5, bottom plate portion 41 is in the form of a plate facing the inner bottom surface 35b of lower case portion 35, and is formed between concave mirror 12 and correction mirror 11. The length of bottom plate portion 41 in the X direction decreases from concave mirror 12 toward correction mirror 11.

[0023] 9 and 10, positioning pins 41a to 41c are provided upright on the back surface (the surface opposite to the optical path space S) of the bottom plate portion 41. The positioning pins 41a to 41c are cylindrical and fit into holes 35a, 35c, and 35d (see FIG. 10) formed in the inner bottom surface 35b of the lower case portion 35. This positions the blind cover 40 in the lower case portion 35. The positioning pin 41b is located approximately in the center of the back surface of the bottom plate portion 41. The positioning pins 41a and 41b are aligned in the Z direction and are positioned opposite the correction mirror 11 in the Z direction. The positioning pin 41c is positioned not opposite the correction mirror 11 in the Z direction, and more specifically, is located closer to the side wall 45R than the correction mirror 11. The distance between each of the positioning pins 41a and 41b and the correction mirror 11 is shorter than the distance between the positioning pin 41c and the correction mirror 11. No positioning pins are formed on the side walls 45L and 45R.

[0024] 3, 5, and 8, the extensions 43L and 43R are located on both sides in the X direction at the end of the bottom plate portion 41 on the correction mirror 11 side. The extensions 43L and 43R are connected to the underside of the end of the bottom plate portion 41 on the correction mirror 11 side. The extensions 43L and 43R extend from the center in the X direction of the lower end face of the concave mirror 12 to positions spaced apart on both sides.

[0025] The length of extension 43R in the Z direction decreases as it moves away from extension 43L in the X direction. The length of extension 43L in the Z direction is the same in the X direction. The shortest length of extension 43R in the Z direction is longer than the length of extension 43L in the Z direction. A gap G is formed between extensions 43L and 43R in the X direction. The center of the lower end surface of concave mirror 12 in the X direction is located in gap G. Here, the lower end surface of concave mirror 12 is located lowest at the center in the X direction and curves upward as it moves outward in the X direction from this center. The formation of gap G prevents extensions 43L and 43R from contacting the lower end surface of concave mirror 12.

[0026] 3, the pair of side walls 45L, 45R extend upright from both outer ends of the bottom plate 41 in the X direction. The pair of side walls 45L, 45R are formed between the light-shielding wall 48 and the reflecting surface 12a in the Z direction. The pair of side walls 45L, 45R are formed such that the inter-surface distance between the pair of side walls 45L, 45R increases as the distance approaches the concave mirror 12 from the correction mirror 11.

[0027] As shown in FIGS. 1 and 3 , the light-shielding wall 48 is inclined so as to hang down from the rear edge of the opening 36a of the case 30 in the Z direction. The light-shielding wall 48 blocks sunlight traveling from outside the head-up display device 10 toward the correction mirror 11 and the display 14. The light-shielding wall 48 extends in the X direction and is plate-shaped, inclining toward the bottom plate portion 41 as it approaches from the correction mirror 11 toward the concave mirror 12. Ends of the side wall portions 45L, 45R closer to the correction mirror 11 are connected to both ends in the X direction of the upper surface of the light-shielding wall 48. A notch 48a opening toward the bottom plate portion 41 is formed in the light-shielding wall 48. The peripheral end of the notch 48a is connected to the end of the opening tube portion 42 closer to the concave mirror 12.

[0028] As shown in FIG. 6, the opening tubular portion 42 is located on the rear side of the light-shielding wall 48 (opposite the optical path space S) and has a tubular shape that surrounds the outer periphery of the display light L reflected by the correction mirror 11. The mirror installation frame 47 is located at the end of the opening tubular portion 42 opposite the light-shielding wall 48. The mirror installation frame 47 is in the shape of a frame that covers the outer periphery of the reflecting surface of the correction mirror 11, and supports the correction mirror 11 while being in contact with the outer periphery of the reflecting surface of the correction mirror 11.

[0029] As shown in Fig. 4, the receiving portions 44L, 44R, 44C are located on the outer periphery of the mirror installation frame portion 47 and are formed in a concave shape so as to support the pressed portions 11L, 11R, 11C of the correction mirror 11. The leaf springs 39L, 39R, 39C press the pressed portions 11L, 11R, 11C in the receiving portions 44L, 44R, 44C, thereby holding the pressed portions 11L, 11R, 11C within the receiving portions 44L, 44R, 44C. The screw holes SH (see Fig. 6) of the screws Sc that fix the leaf springs 39L, 39R, 39C open rearward.

[0030] The opening direction of the screw holes SH and the opening direction of the receiving portions 44L, 44R, 44C are the same direction, and are opposite to the traveling direction of the display light L reflected by the correction mirror 11 (toward the rear of the vehicle). Therefore, the assembly direction of the correction mirror 11 to the mirror installation frame portion 47 and the screw installation direction when screwing in the leaf springs 39L, 39R, 39C can be the same. This makes it easy to assemble the head-up display device 10.

[0031] 7, the light entrance tube portion 49 surrounds the outer periphery of the display light L from the display 14 to the correction mirror 11 and has a cylindrical shape that penetrates in the Y direction. The light entrance tube portion 49 is positioned so as to face the mirror installation frame portion 47 in the Y direction. 5, the upper end of the light incident tube portion 49 is connected to the bottom surface of the opening tube portion 42 as an opening 49h that emits the display light L. The opening 49h is closer to the side wall portion 45R than the center of the blind cover 40 in the X direction. The light incident tube portion 49 has a rectangular cylindrical shape that is long in the X direction.

[0032] As shown in FIGS. 7 and 9, the light entrance tube portion 49 includes four wall portions 49a to 49d that surround the outer periphery of the display light from the display device. The walls 49a and 49c extend in the Z direction and are aligned in the X direction. The walls 49b and 49d extend in the X direction and are aligned in the Z direction. The wall portion 49a is located closer to the side wall portion 45R than the wall portion 49c. The wall portion 49a extends perpendicular to the bottom plate portion 41. The wall portion 49c is inclined with respect to the bottom plate portion 41, and more specifically, is inclined so as to approach the wall portion 49a as it extends downward. The wall portion 49b is formed so that its height relative to the bottom plate portion 41 decreases from the wall portion 49c toward the wall portion 49a.

[0033] Wall portion 49d is located farther from concave mirror 12 than wall portion 49b, and is formed in a plate shape with a smaller area than the other walls 49a to 49c. Receiving portion 44C is formed on the surface of wall portion 49d opposite to opening 49h. Wall portion 49d is plate-shaped and has a length shorter than wall portion 49b in the X direction and a height shorter than the maximum height of wall portion 49b in the Y direction. One end (the left end in FIG. 9) of wall portion 49d in the X direction is connected to wall portion 49a, and the other end (the right end in FIG. 9) is separated from wall portion 49c via a gap H. Gap H faces a taller portion of wall portion 49b in the Z direction.

[0034] As shown in Figures 4 and 6, the lower case 35 includes a blocking portion 34 that blocks the gap H and the lower side of the wall 49d. The blocking portion 34 is formed of resin as part of the lower case 35. The blocking portion 34 is plate-shaped with a notch in a shape corresponding to the wall 49d. The light incident tube 49 is formed into a closed cylindrical shape by blocking the gap H and the lower side of the wall 49d with the blocking portion 34. In this case, the blocking portion 34 and the wall 49d form a single plate made of different materials. The blocking portion 34 may be formed integrally with the lower case portion 35, or may be formed separately.

[0035] (effect) According to the embodiment described above, the following effects are achieved. (1) The head-up display device 10 includes a display 14 that emits display light L, a correction mirror 11 that reflects the display light L so that the upper and lower ends of the display light L intersect, a concave mirror 12 that reflects the display light L so that it is projected outside the head-up display device 10, a case 30 that houses the display 14, the correction mirror 11, and the concave mirror 12 and has an opening 36a through which the display light L passes, and is made of synthetic resin, and a blind cover 40 that is installed on the inner bottom surface 35b of the case 30 and is made of metal and forms an optical path space S through which the display light L travels within the case 30. In a cross optical system in which the correction mirror 11 crosses the upper and lower ends of the display light L, the concave mirror 12 tends to collect sunlight (parallel light). According to the above configuration, the blind cover 40 is made of metal, which improves heat resistance against heating caused by light collection in the cross optical system, while the case 30 is made of resin, which makes it possible to reduce the weight of the head-up display device 10.

[0036] (2) The blind cover 40 includes a light-shielding wall 48 formed to hang down from a portion of the edge of the opening 36a. According to this configuration, the light-shielding wall 48, which easily collects sunlight, is made of metal, so that the heat resistance of the head-up display device 10 can be improved.

[0037] (3) The head-up display device 10 includes a mirror rotation drive unit 18 that rotates the concave mirror 12 about a rotation axis Ax that extends in the left-right direction as seen by a viewer viewing a virtual image V, which is an example of a projected image displayed by the head-up display device 10. The blind cover 40 is located between the correction mirror 11 and the concave mirror 12 and includes a bottom plate portion 41 that is located opposite the inner bottom surface 35b of the case 30, and extension portions 43L, 43R that are formed on the end of the bottom plate portion 41 on the concave mirror 12 side and that protrude downward from both left and right ends of the concave mirror 12. According to this configuration, extensions 43L and 43R prevent unnecessary structures such as wiring inside case 30 from being visible even when concave mirror 12 is rotated, improving the appearance of the inside of case 30. Furthermore, since a gap G is formed between the two extensions 43L, 43R, the rotating concave mirror 12 is prevented from contacting the blind cover 40. Furthermore, it is no longer necessary to place the concave mirror 12 far away from the blind cover 40 in order to avoid this contact, and an increase in the size of the head-up display device 10 can be suppressed.

[0038] (4) The blind cover 40 has a plurality of walls 49a to 49d that surround the outer periphery of the display light L traveling from the display 14 to the correction mirror 11. Of the plurality of walls 49a to 49d, at least a portion of one wall 49d that faces the inner side surface of the case 30 is omitted to form a gap H. The case 30 has a blocking portion 34 that blocks the gap H. According to this configuration, the closing portion 34 of the resin case 30 closes the gaps H between the metal wall portions 49a to 49d, thereby making it possible to reduce the weight compared to a case where the case is made entirely of metal and has a cylindrical shape. Furthermore, since there is no double wall, the head-up display device 10 can be made smaller.

[0039] (5) The blind cover 40 holds the correction mirror 11 and includes a frame-shaped mirror installation frame portion 47. The mirror installation frame portion 47 is configured so that the correction mirror 11 can be attached from a direction along the traveling direction of the display light L reflected by the correction mirror 11. According to this configuration, the head-up display device 10 can be manufactured more easily than in a configuration in which the correction mirror 11 is attached to the mirror installation frame portion 47 from above. Furthermore, the direction in which the correction mirror 11 is assembled to the mirror installation frame 47 is the same as the direction in which the screws Sc for fixing the correction mirror 11 to the mirror installation frame 47 are attached. This makes it possible to easily assemble and fix the correction mirror 11 to the mirror installation frame 47.

[0040] (6) Blind cover 40 is located between correction mirror 11 and concave mirror 12, and includes bottom plate portion 41 positioned opposite inner bottom surface 35b of case 30, and positioning pins 41a to 41c, which are an example of a plurality of positioning portions, formed on the back surface of bottom plate portion 41 facing inner bottom surface 35b of case 30 and positioned in holes 35a, 35c, and 35d, which are an example of a portion to be positioned, formed in inner bottom surface 35b of case 30. Of the plurality of positioning pins 41a to 41c, positioning pins 41a and 41b are positioned opposite correction mirror 11 in the Z direction along display light L between correction mirror 11 and concave mirror 12. High positioning accuracy is required for the correction mirror 11. According to the above configuration, the positioning of the blind cover 40 can be performed at a location close to the correction mirror 11 by the positioning pins 41a and 41b. Furthermore, since the bottom plate portion 41 is stronger than the side wall portions 45L, 45R, by forming the positioning pins 41a to 41c on the bottom plate portion 41, more stable positioning is possible than when the positioning pins 41a to 41c are formed on the side wall portions 45L, 45R.

[0041] The present disclosure is not limited to the above-described embodiments and drawings. Modifications (including deletion of components) may be made as appropriate within the scope of the present disclosure. An example of such a modification is described below.

[0042] (Variation) In the above embodiment, the mirror installation frame portion 47 and the receiving portions 44L, 44R, 44C may be formed separately from the blind cover 40 and made of resin or metal. The light-shielding wall 48 may be formed of resin or metal separately from the blind cover 40. The light-shielding wall 48 may be formed in the upper case portion 36. The extensions 43L and 43R may be connected in the X direction. Alternatively, either or both of the extensions 43L and 43R may be omitted. In the above embodiment, the mirror rotation drive unit 18 may be omitted. In this case, the concave mirror 12 may be fixed in the case 30 so as not to be rotatable. In the above embodiment, the light incident tube portion 49 may be formed without the gap H. In this case, the blocking portion 34 may be omitted. In the above embodiment, the positions and number of the positioning pins 41a to 41c can be changed as appropriate. The positioning pins may be formed on the side wall portions 45L and 45R. In the above embodiment, the correction mirror 11 may be a plane mirror. In the above embodiment, the lower case portion 35 may be formed with the positioning pins 41a to 41c, and the blind cover 40 may be formed with the holes 35a, 35c, and 35d.

[0043] In the above embodiment, the projection target member is the windshield 19, but it may be a dedicated combiner. The head-up display device 10 is not limited to being mounted on a vehicle, but may also be mounted on other vehicles such as an airplane, a ship, etc.

[0044] In the above embodiment, the display 14 is, for example, a TFT-type liquid crystal display panel, but is not limited to this and may be configured to include an organic EL display, a MEMS (Micro Electro Mechanical System), or a DMD (Digital Micro-mirror Device).

[0045] In the above embodiment, the blind cover 40 is not limited to being made of metal and may be made of resin. Also, the correction mirror 11 may be a folding mirror that does not cross the display light L. These modifications are included in the technical ideas described in the following supplementary notes. (Appendix 1) A head-up display device, a display that emits a display light; a folding mirror that reflects the display light; a concave mirror that reflects the display light so as to project it outside the head-up display device; a case that houses the display, the reflecting mirror, and the concave mirror and has an opening through which the display light passes; a blind cover that is installed on the inner bottom surface of the case and forms an optical path space through which the display light travels within the case; a mirror rotation drive unit that rotates the concave mirror around a rotation axis extending in the left-right direction, The blind cover is a bottom plate portion located between the folding mirror and the concave mirror and facing an inner bottom surface of the case; an extension portion formed at an end portion of the bottom plate portion on the concave mirror side and protruding downward from the concave mirror, Head-up display device.

[0046] (Appendix 2) A head-up display device, a display that emits a display light; a folding mirror that reflects the display light; a concave mirror that reflects the display light so as to project it outside the head-up display device; a case that houses the display, the reflecting mirror, and the concave mirror and has an opening through which the display light passes; a blind cover that is installed on the inner bottom surface of the case and forms an optical path space through which the display light travels within the case, the blind cover includes a plurality of wall portions that surround an outer periphery of the display light directed from the display device to the folding mirror; At least a portion of one of the plurality of wall portions that faces an inner side surface of the case is omitted to form a gap, The case includes a closing portion that closes the gap. Head-up display device.

[0047] (Appendix 3) A head-up display device, a display that emits a display light; a folding mirror that reflects the display light; a concave mirror that reflects the display light so as to project it outside the head-up display device; a case that houses the display, the reflecting mirror, and the concave mirror and has an opening through which the display light passes; a blind cover that is installed on the inner bottom surface of the case and forms an optical path space through which the display light travels within the case, the blind cover includes a mirror installation frame portion that holds the folding mirror and is formed in a frame shape, The folding mirror is configured to be assembled to the mirror installation frame from a direction along the traveling direction of the display light reflected by the folding mirror. Head-up display device. [Explanation of symbols]

[0048] 10...Head-up display device 11...correction mirror, 11C, 11L, 11R...pressed portions, 11a...reflecting surface 12...concave mirror, 12a...reflecting surface 13...Lighting section 14...Indicator 15...Control board 18...Mirror rotation drive unit 19...Windshield 30...Case, 34...Blocking portion, 35...Lower case portion, 35b...Inner bottom surface, 35a, 35c, 35d...Hole portion, 36...Upper case portion, 36a...Opening, 36b...Light-transmitting plate portion, 37...Lower cover portion, 39L, 39R, 39C...Leaf spring 40... blind cover, 41... bottom plate portion, 41a to 41c... positioning pins, 42... opening tube portion, 43L, 43R... extension portion, 44C, 44L, 44R... receiving portion, 45L, 45R... side wall portion, 47... mirror installation frame portion, 48... light shielding wall, 48a... notch portion, 49... light incident tube portion, 49a to 49d... wall portion, 49h... opening CP...cross point, G...gap, H...gap, L...display light, S...light path space, SH...screw hole, Sc...screw, Ax...rotation axis

Claims

1. A head-up display device, a display that emits a display light; a correction mirror that reflects the upper and lower ends of the display light so as to intersect; a concave mirror that reflects the display light so as to project it outside the head-up display device; a case made of synthetic resin that houses the display, the correction mirror, and the concave mirror, and has an opening through which the display light passes; a blind cover that is installed on the inner bottom surface of the case and is made of metal to form an optical path space through which the display light travels within the case, Head-up display device.

2. The blind cover includes a light-shielding wall that extends from a part of the edge of the opening and blocks sunlight. The head-up display device according to claim 1 .

3. the head-up display device includes a mirror rotation drive unit that rotates the concave mirror around a rotation axis extending in the left-right direction, The blind cover is a bottom plate portion located between the correction mirror and the concave mirror and facing an inner bottom surface of the case; an extension portion formed at an end portion of the bottom plate portion on the concave mirror side and protruding downward from the concave mirror, The head-up display device according to claim 1 .

4. the blind cover includes a plurality of wall portions that surround an outer periphery of the display light traveling from the display device to the correction mirror, At least a portion of one of the plurality of wall portions that faces an inner side surface of the case is omitted to form a gap, The case includes a closing portion that closes the gap. The head-up display device according to claim 1 .

5. the blind cover includes a mirror installation frame portion that holds the correction mirror and is formed in a frame shape, The correction mirror is configured to be assembled to the mirror installation frame from a direction along the traveling direction of the display light reflected by the correction mirror. The head-up display device according to claim 1 .

6. The blind cover is a bottom plate portion located between the correction mirror and the concave mirror and facing an inner bottom surface of the case; a plurality of positioning portions formed on a rear surface of the bottom plate portion opposite to the inner bottom surface of the case, the positioning portions being positioned to positioned portions formed on the inner bottom surface of the case; At least one of the plurality of positioning portions is positioned opposite the correction mirror in a direction along the display light between the correction mirror and the concave mirror. The head-up display device according to claim 1 .

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