Head-up display device

Abstract

The invention provides a head-up display device which can improve heat resistance of light condensation and realize light weight. This head-up display device (10) is provided with: a display (14) that emits display light (L); a correction mirror (11) that reflects the display light (L) so that the upper end and the lower end of the display light (L) intersect each other; a concave mirror (12) that reflects the display light (L) so as to project the display light (L) to the outside of the head-up display device (10); a housing (30) which is formed from a synthetic resin, 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 a light shield (40) which is made of metal, is arranged on the inner bottom surface (35b) of the housing (30), and forms an optical path space (S) in the housing (30), and the display light (L) travels in the optical path space (S).

Description

Technical Field

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

[0002] The head-up display device described in Patent Document 1 includes a first reflector, a second reflector, and a housing that houses the first and second reflectors, with a cross-beam optical path formed between the first and second reflectors. In the head-up display device that forms this cross-beam optical path, the temperature tends to rise due to the focusing of sunlight within the housing. Therefore, from the viewpoint of heat resistance, the central frame and upper cover of the housing are made of metal (see paragraphs 0034 and 0037 of Patent Document 1).

[0003] Existing technical documents

[0004] Patent documents

[0005] Patent Document 1: Japanese Patent No. 6769481 Summary of the Invention

[0006] The technical problem that the invention aims to solve

[0007] In the structure described in Patent Document 1 above, while making the casing metal improves the heat resistance of the head-up display device, it also increases its weight. On the other hand, while making the casing resin enables a lighter head-up display device, it results in lower heat resistance for light focusing.

[0008] The present invention was made in view of the above-mentioned actual situation, and its object is to provide a head-up display device that can improve the heat resistance to light concentration and achieve lightweight.

[0009] Technical solutions adopted to solve technical problems

[0010] To achieve the above objectives, the head-up display device according to the present invention comprises:

[0011] A display that emits display light;

[0012] A correction mirror that reflects the display light in such a way that the upper and lower ends of the light cross.

[0013] A concave mirror that reflects the display light in a manner that projects the display light toward the outside of the head-up display device;

[0014] A housing, formed of synthetic resin, houses the display, the calibration mirror, and the concave mirror, and has an opening for the display light to pass through; and

[0015] A light shield, which is made of metal, is disposed on the inner bottom surface of the housing and forms an optical path space within the housing for the display light to travel.

[0016] Invention Effects

[0017] According to the present invention, the heat resistance to light concentration can be improved, and lightweighting can be achieved. Attached Figure Description

[0018] Figure 1 This is a schematic cross-sectional view of a head-up display device according to one embodiment of the present invention.

[0019] Figure 2 This is a perspective view of a head-up display device with the upper housing removed, according to one embodiment of the present invention.

[0020] Figure 3 This is a perspective view of a head-up display device with the upper housing removed, according to one embodiment of the present invention.

[0021] Figure 4 This is a perspective view of a light shield and a correction mirror according to one embodiment of the present invention.

[0022] Figure 5 This is a perspective view of a light shield according to one embodiment of the present invention.

[0023] Figure 6 This is a perspective view of a light shield according to one embodiment of the present invention.

[0024] Figure 7 This is a perspective view of a light shield according to one embodiment of the present invention.

[0025] Figure 8 yes Figure 3 A cross-sectional view of line VIII-VIII.

[0026] Figure 9 This is a perspective view of a light shield according to one embodiment of the present invention.

[0027] Figure 10 This is a top view of a state in which a light shield, shown transparently, is disposed within the lower housing portion according to an embodiment of the present invention. Detailed Implementation

[0028] A head-up display device according to one embodiment of the present invention will be described with reference to the accompanying drawings.

[0029] like Figure 1As shown, the head-up display 10 is mounted on a vehicle and projects a display light L onto the windshield 19, which is one example of the projected component, to display a projected image containing vehicle information as a virtual image. Furthermore, in the following description, the vehicle's height direction is defined as the Y direction, the vehicle's width direction as the X direction, and the vehicle's front-to-back direction as the Z direction.

[0030] The head-up display device 10 includes a correction mirror 11, which is an example of a fixed reflector; a concave mirror 12, which is an example of a rotating reflector; a housing 30; an illumination unit 13; a display 14; a control board 15; and a reflector rotation drive unit 18.

[0031] The illumination unit 13 emits illumination light to the display 14 under the control of the control board 15. The illumination unit 13 includes, for example, multiple LEDs (Light Emitting Diodes).

[0032] The display 14 receives illumination light from the illumination unit 13 and emits display light L to represent an image. The display 14 is, for example, a TFT (Thin Film Transistor) type liquid crystal display panel.

[0033] The control board 15 controls the lighting unit 13, the display 14, and the reflector rotation drive unit 18. The control board 15 includes a CPU (Central Processing Unit), a GDC (Graphics Display Controller), ROM (Read Only Memory), and RAM (Random Access Memory). The control board 15 receives vehicle information from the outside and, when the display 14 is displaying an image containing that vehicle information, emits illumination light from the lighting unit 13 toward the display 14.

[0034] like Figure 1As shown, the correction mirror 11 reflects the display light L from the display 14 towards the concave mirror 12. The correction mirror 11 has a reflective surface 11a, which is a freeform surface that corrects the distortion of the virtual image caused by the shape of the windshield 19. The reflective surface 11a of the correction mirror 11 faces the front and lower side of the vehicle. The reflective surface 11a causes the upper and lower ends of the reflected display light L to intersect at a crosspoint CP. The crosspoint CP is located between the correction mirror 11 and the concave mirror 12, specifically, closer to the correction mirror 11 than the midpoint between the correction mirror 11 and the concave mirror 12. In the cross-optical system that causes the display light L to intersect, the curvature of the reflective surface 11a of the correction mirror 11 and the reflective surface 12a of the concave mirror 12 is greater than that of a structure that does not cause the display light L to intersect. The greater the curvature of the reflective surfaces 11a and 12a, the more significant the focusing of sunlight.

[0035] like Figure 4 As shown, the correction mirror 11 has three pressing portions 11L, 11R, and 11C. Two of the pressing portions 11L and 11R are convex on both sides of the correction mirror 11 in the X direction. Each pressing portion 11L and 11R is approximately cylindrical and extends in the X direction. The pressing portion 11C is convex on the lower side of the correction mirror 11.

[0036] like Figure 1 As shown, the concave mirror 12 has a reflective surface 12a that reflects the display light L from the correction mirror 11 toward the windshield 19. The reflective surface 12a faces obliquely 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, with the lowermost portion located at the center in the X direction, and is curved upward toward the outer side from the center in the X direction.

[0037] The two ends of the concave mirror 12 on the rotation axis Ax are supported in the housing 30 in a manner that allows it to rotate about the rotation axis Ax.

[0038] like Figure 2 As shown, the concave mirror 12 is formed to be longer in the X direction, and the size of the concave mirror 12 in the X direction is larger than the size of the correction mirror 11 in the X direction. The concave mirror 12 and the correction mirror 11 face each other in the Z direction, and the center position of the correction mirror 11 in the X direction is located closer to the side wall portion 45R described later in the X direction than the center position of the concave mirror 12 in the X direction.

[0039] like Figure 1 As shown, the mirror rotation drive unit 18, under the control of the control board 15, causes the concave mirror 12 to rotate around the rotation axis Ax. If the concave mirror 12 rotates around the rotation axis Ax, the illumination position of the display light L relative to the visual observer can be adjusted in the Z direction.

[0040] The housing 30 includes a lower housing portion 35, an upper housing portion 36, and a lower cover portion 37. Each part of the housing 30 is formed of a light-shielding resin.

[0041] The lower housing 35 is box-shaped with an opening facing upwards. Inside the lower housing 35 are a light shield 40, a correction mirror 11, a concave mirror 12, and a mirror rotation drive unit 18. An illumination unit 13, a display 14, and a control board 15 are provided on the outer bottom surface of the lower housing 35.

[0042] The lower cover 37 is mounted on the outer bottom side of the lower housing 35 in such a way that it covers the lighting unit 13 and the display 14.

[0043] The upper housing portion 36 is mounted on the upper part of the lower housing portion 35 in such a way that it closes the upper opening of the lower housing portion 35. The upper housing portion 36 is formed into a frame shape having an opening 36a through which the display light L from the concave mirror 12 toward the windshield 19 passes. The opening 36a of the upper housing portion 36 is closed by a light-transmitting plate portion 36b through which light containing the display light L passes.

[0044] A light shield 40 is disposed within the housing 30, forming an optical path space S within the housing 30 for the propagation of the display light L. The light shield 40 conceals structures and shapes that may contribute to stray light from the optical path space S (e.g., rib structures and mirror rotation drive units 18 formed within the housing 30). The light shield 40 is integrally formed of metal. The metal can be a general metal or a light metal, but a light metal such as an aluminum alloy or a magnesium alloy is more preferred. The light shield 40 is configured to cover the area where parallel light, such as sunlight, can be focused by the concave mirror 12 from the opening 36a of the housing 30.

[0045] The sunshade 40 is formed by methods such as casting, die casting, stamping or bending, but it can also be formed by other construction methods.

[0046] The sunshade 40 has the following features: Figure 2 and Figure 3 As shown, the base plate 41, extensions 43L and 43R, a pair of sidewalls 45L and 45R, a light-shielding wall 48, and an open cylinder 42, etc. Figure 6 As shown, there is a reflector mounting frame 47, receiving parts 44L, 44R, 44C, and a light-entry tube 49.

[0047] like Figure 3 and Figure 5 As shown, the base plate portion 41 is plate-shaped and faces the inner bottom surface 35b of the lower housing portion 35, and is formed between the concave mirror 12 and the correction mirror 11. The length of the base plate portion 41 in the X direction decreases as it moves from the concave mirror 12 toward the correction mirror 11.

[0048] like Figure 9 and Figure 10As shown, positioning pins 41a to 41c are erected on the back side of the base plate 41 (the side opposite to the optical path space S). Positioning pins 41a to 41c are cylindrical and are inserted into holes 35a, 35c, and 35d formed in the inner bottom surface 35b of the lower housing 35 (see reference). Figure 10 Thus, the light shield 40 is positioned on the lower housing portion 35. The positioning pin 41b is located approximately at the center of the back side of the base plate portion 41.

[0049] Positioning pins 41a and 41b are arranged in the Z direction and positioned opposite the calibration mirror 11 in the Z direction. Positioning pin 41c is positioned opposite the calibration mirror 11 in the Z direction; specifically, it is located closer to the side wall portion 45R than the calibration mirror 11. The distance between each positioning pin 41a and 41b and the calibration mirror 11 is shorter than the distance between the positioning pin 41c and the calibration mirror 11. No positioning pins are formed on the side walls 45L and 45R.

[0050] like Figure 3 , Figure 5 and Figure 8 As shown, the extensions 43L and 43R are located on both sides of the end of the base plate 41 on the side of the correction mirror 11. The extensions 43L and 43R are connected to the lower surface of the end of the base plate 41 on the side of the correction mirror 11. The extensions 43L and 43R extend into positions offset outward from the center of the lower end face of the concave mirror 12 in the X direction.

[0051] The length of the extension 43R in the Z direction decreases in the X direction as it moves away from the extension 43L. The length of the extension 43L in the Z direction is the same in the X direction. The shortest length of the extension 43R in the Z direction is longer than the length of the extension 43L in the Z direction. A gap G is formed between the extensions 43L and 43R in the X direction. The central portion of the lower end face of the concave mirror 12 in the X direction is located in the gap G. Here, the lower end face of the concave mirror 12 is located at the lowermost side at the central portion in the X direction, and is curved upwards as it moves outwards from the central portion in the X direction. By forming the gap G, contact between the extensions 43L and 43R and the lower end face of the concave mirror 12 is suppressed.

[0052] like Figure 3 As shown, a pair of sidewall portions 45L and 45R extend vertically from the two outer ends of the base plate portion 41 in the X direction. A pair of sidewall portions 45L and 45R are formed in the Z direction between the light-shielding wall 48 and the reflecting surface 12a. The inter-surface distance between the pair of sidewall portions 45L and 45R increases as the correction mirror 11 approaches the concave mirror 12.

[0053] like Figure 1 and Figure 3As shown, the light-shielding wall 48 is inclined downwards from the rear edge of the opening 36a in the Z direction of the housing 30. The light-shielding wall 48 blocks sunlight traveling from the outside of 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, inclined as it approaches the base plate 41 from the correction mirror 11 toward the concave mirror 12. The ends of the sidewall portions 45L and 45R near the correction mirror 11 are connected to both ends of the upper surface of the light-shielding wall 48 in the X direction. A cutout portion 48a is formed on the light-shielding wall 48 that opens toward the base plate 41. The peripheral end of the cutout portion 48a is connected to the end of the opening cylinder portion 42 near the concave mirror 12.

[0054] like Figure 6 As shown, the open cylindrical portion 42 is located on the back side of the light-shielding wall 48 (opposite to the light path space S), and is cylindrical in shape that surrounds the outer periphery of the display light L reflected by the correction mirror 11.

[0055] The mirror mounting frame 47 is located at the end of the opening cylinder 42 opposite to the light-shielding wall 48. The mirror mounting frame 47 is a frame shape that covers the outer peripheral side of the reflective surface of the correction mirror 11 and supports the correction mirror 11 in a state of contact with the outer peripheral side of the reflective surface of the correction mirror 11.

[0056] like Figure 4 As shown, the receiving portions 44L, 44R, and 44C are located on the outer periphery of the reflector mounting frame portion 47 and are formed in a concave shape to support the pressed portions 11L, 11R, and 11C of the correction mirror 11. The leaf springs 39L, 39R, and 39C retain the pressed portions 11L, 11R, and 11C within the receiving portions 44L, 44R, and 44C by pressing them against the pressed portions 11L, 11R, and 11C. The screw Sc that fixes the leaf springs 39L, 39R, and 39C has a threaded hole SH (see reference). Figure 6 It opens towards the rear.

[0057] The opening direction of the threaded hole SH and the opening directions of the receiving portions 44L, 44R, and 44C are the same, which is opposite to the direction of travel of the display light L reflected by the correction mirror 11 (rear of the vehicle). Therefore, the assembly direction of the correction mirror 11 toward the reflector mounting frame portion 47 can be the same as the screw mounting direction when the leaf springs 39L, 39R, and 39C are screwed in place. Therefore, the assembly of the head-up display device 10 becomes easier.

[0058] like Figure 7 As shown, the light-incident tube 49 surrounds the outer periphery of the display light L from the display 14 to the correction mirror 11, and is cylindrical in shape extending through the Y direction. The light-incident tube 49 is located opposite the reflector mounting frame 47 in the Y direction.

[0059] like Figure 5As shown, 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 for emitting the display light L. The opening 49h is closer to the side wall portion 45R than the center of the light shield 40 in the X direction. The light-incident tube portion 49 is a rectangular tube that is longer in the X direction.

[0060] like Figure 7 and Figure 9 As shown, the light-incident tube portion 49 has four wall portions 49a to 49d surrounding the outer periphery of the display light L from the display 14.

[0061] Wall portions 49a and 49c extend in the Z direction and are arranged in the X direction. Wall portions 49b and 49d extend in the X direction and are arranged in the Z direction.

[0062] The wall portion 49a is located closer to the side wall portion 45R than the wall portion 49c. The wall portion 49a extends vertically relative to the base plate portion 41. The wall portion 49c is inclined relative to the base plate portion 41, specifically, it is inclined in a manner that approaches the wall portion 49a towards the lower side.

[0063] The wall portion 49b is formed such that its height relative to the base plate portion 41 decreases as it approaches the wall portion 49a from the wall portion 49c.

[0064] The wall portion 49d is located further away from the concave mirror 12 than the wall portion 49b, and is formed into a plate with a smaller area than the other wall portions 49a to 49c. A receiving portion 44c is formed on the surface of the wall portion 49d opposite to the opening portion 49h.

[0065] The wall portion 49d is plate-shaped, shorter in length in the X direction than the wall portion 49b and lower in height in the Y direction than the maximum height of the wall portion 49b. One end of the wall portion 49d in the X direction ( Figure 9 The left end) is connected to the wall 49a, and the other end ( Figure 9 The right end) is away from the wall 49c via the gap H. The gap H is opposite the higher part of the wall 49b in the Z direction.

[0066] like Figure 4 and Figure 6 As shown, the lower housing portion 35 includes a blocking portion 34 on the lower side of the blocking gap H and the wall portion 49d. The blocking portion 34 is formed of resin as part of the lower housing portion 35. The blocking portion 34 is plate-shaped with a cutout corresponding to the shape of the wall portion 49d. The light-receiving tube portion 49 is cylindrical and closed by the blocking portion 34 blocking the gap H and the lower side of the wall portion 49d. At this time, the blocking portion 34 and the wall portion 49d are made of a single plate of different types of materials.

[0067] The blocking part 34 can be integrally formed with the lower housing part 35, or it can be formed separately.

[0068] (Effect)

[0069] According to one implementation method described above, the following effects are achieved.

[0070] (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 in such a way that the upper and lower ends of the display light L cross; a concave mirror 12 that reflects the display light L in such a way that it is projected onto the outside of the head-up display device 10; a housing 30 that is formed of synthetic resin and 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 a light shield 40 that is formed of metal and is disposed on the inner bottom surface 35b of the housing 30, forming an optical path space S for the display light L to travel within the housing 30.

[0071] In the cross optical system where the upper and lower ends of the display light L are crossed by the correction mirror 11, sunlight (parallel light) is easily focused by the concave mirror 12.

[0072] According to the above structure, by forming the light shield 40 with metal, the heat resistance to the heating of the light-gathering system accompanying the cross optical system can be improved, and by forming the housing 30 with resin, the head-up display device 10 can be made lightweight.

[0073] (2) The light shield 40 has a light shield wall 48 formed in such a way that it hangs down from a part of the edge of the opening 36a.

[0074] According to this structure, since the light-blocking wall 48, which easily concentrates sunlight, is made of metal, the heat resistance of the head-up display device 10 can be improved.

[0075] (3) The head-up display device 10 includes a mirror rotation drive unit 18, which rotates the concave mirror 12 about a rotation axis Ax, which extends in the left-right direction when viewed by a visual observer observing an example of the projected image displayed by the head-up display device 10, namely the virtual image V. The light shield 40 includes: a base plate 41 located between the correction mirror 11 and the concave mirror 12, and positioned opposite the inner bottom surface 35b of the housing 30; and extensions 43L and 43R formed at the ends of the base plate 41 on the side of the concave mirror 12, and protruding downwards to the left and right ends of the concave mirror (12).

[0076] According to this structure, even if the concave mirror 12 is rotated, the wiring and other unnecessary structures inside the housing 30 can be suppressed from being seen through the extensions 43L and 43R, and the appearance inside the housing 30 is good.

[0077] Furthermore, since a gap G is formed between the two extensions 43L and 43R, it is possible to prevent the rotating concave mirror 12 from contacting the light shield 40. In addition, it is not necessary to move the concave mirror 12 far away from the light shield 40 to avoid such contact, thus suppressing the enlargement of the head-up display device 10.

[0078] (4) The light shield 40 has a plurality of walls 49a to 49d that surround the outer periphery of the display light L from the display 14 toward the correction mirror 11. At least a portion of one of the walls 49a to 49d that faces the inner side of the housing 30 is omitted to form a gap H. The housing 30 has a blocking portion 34 that blocks the gap H.

[0079] According to this structure, the sealing portion 34 of the resin housing 30 blocks the gaps H of the multiple metal wall portions 49a to 49d, thereby achieving a lighter weight compared to the case where it is entirely formed into a cylindrical shape by metal. In addition, by not forming a double-walled structure, the head-up display device 10 can also be miniaturized.

[0080] (5) The light shield 40 has a reflector mounting frame 47 that holds the correction mirror 11 and is formed in a frame shape. The correction mirror 11 is configured to be assembled into the reflector mounting frame 47 in a direction along the travel direction of the reflected display light L.

[0081] According to this structure, compared with the structure in which the correction mirror 11 is assembled from the top to the reflector mounting frame 47, the head-up display device 10 can be manufactured simply.

[0082] Furthermore, the assembly direction of the correction mirror 11 to the reflector mounting frame 47 and the mounting direction of the screw Sc used to fix the correction mirror 11 to the reflector mounting frame 47 are set to the same direction. Therefore, the correction mirror 11 can be easily assembled and fixed onto the reflector mounting frame 47.

[0083] (6) The light shield 40 includes: a base plate portion 41 located between the correction mirror 11 and the concave mirror 12, and positioned opposite the inner bottom surface 35b of the housing 30; and a plurality of positioning pins 41a to 41c, which are examples of positioning portions, formed on the back side of the base plate portion 41 opposite the inner bottom surface 35b of the housing 30, and positioned in holes 35a, 35c, and 35d formed on the inner bottom surface 35b of the housing 30, which are examples of positioning portions. Positioning pins 41a and 41b of the plurality of positioning pins 41a to 41c are positioned opposite the correction mirror 11 in the Z direction along the display light L between the correction mirror 11 and the concave mirror 12.

[0084] The calibration mirror 11 is required to have high positioning accuracy. According to the above structure, the light shield 40 can be positioned close to the calibration mirror 11 by means of positioning pins 41a and 41b.

[0085] Furthermore, since the base plate 41 has higher strength than the side wall portions 45L and 45R, by forming positioning pins 41a to 41c on the base plate 41, stable positioning can be achieved compared to forming positioning pins 41a to 41c on the side wall portions 45L and 45R.

[0086] Furthermore, the present invention is not limited to the embodiments and drawings described above. Without altering the spirit of the invention, appropriate modifications (including the deletion of constituent elements) can be made. Hereinafter, one example of a modification will be described.

[0087] (Modified Example)

[0088] In the above embodiments, the reflector mounting frame 47 and the receiving portions 44L, 44R, 44C may also be separately formed from resin or metal from the light shield 40.

[0089] The light-shielding wall 48 can also be formed separately from the light-shielding cover 40 from resin or metal. The light-shielding wall 48 can also be formed on the upper housing portion 36.

[0090] The extensions 43L and 43R can be connected in the X direction. Alternatively, either or both of the extensions 43L and 43R can be omitted.

[0091] In the above embodiment, the mirror rotation drive unit 18 may also be omitted. In this case, the concave mirror 12 may also be fixed in the housing 30 without rotation.

[0092] In the above embodiment, the light-entry tube portion 49 may also be formed without gap H. In this case, the blocking portion 34 may also be omitted.

[0093] In the above embodiments, the position and number of locating pins 41a to 41c can be appropriately changed. Locating pins 41a to 41c can also be formed on the sidewall portions 45L and 45R.

[0094] In the above embodiments, the correction mirror 11 can be a plane mirror.

[0095] In the above embodiments, positioning pins 41a to 41c may be formed on the lower housing portion 35, and holes 35a, 35c, and 35d may be formed on the light shield 40.

[0096] In the above embodiment, the projected component is the windshield 19, but it can also be a dedicated assembly. Furthermore, the head-up display 10 is not limited to vehicles, but can also be mounted on other modes of transportation such as airplanes and ships.

[0097] In the above embodiments, the display 14 is, for example, a TFT-type liquid crystal display panel, but is not limited thereto, and may also include an organic EL display, MEMS (Micro Electro Mechanical System) or DMD (Digital Micro-mirror Device) structure.

[0098] In the above embodiments, the light shield 40 is not limited to being made of metal, but may also be made of resin. Furthermore, the correction mirror 11 may also be a folding mirror that prevents the displayed light L from crossing. These variations are included in the technical concepts described in the following appendix.

[0099] (Postscript 1)

[0100] A head-up display device, comprising:

[0101] A display that emits display light;

[0102] A folding mirror reflects the displayed light;

[0103] A concave mirror that reflects the display light in a manner that projects the display light toward the outside of the head-up display device;

[0104] The housing, which houses the display, the folding mirror and the concave mirror, has an opening for the display light to pass through;

[0105] A light shield, disposed on the inner bottom surface of the housing, forms an optical path space within the housing for the propagation of the display light; and

[0106] The mirror rotation drive unit causes the concave mirror to rotate about a rotation axis extending in the left-right direction.

[0107] The light shield has the following features:

[0108] The base plate is located between the reflecting mirror and the concave mirror, and is positioned opposite the inner bottom surface of the housing; and

[0109] An extension portion, formed at the end of the base plate on the concave mirror side, protrudes downward toward the concave mirror.

[0110] (Postscript 2)

[0111] A head-up display device, comprising:

[0112] A display that emits display light;

[0113] A folding mirror reflects the displayed light;

[0114] A concave mirror that reflects the display light in a manner that projects the display light toward the outside of the head-up display device;

[0115] A housing that accommodates the display, the folding mirror, and the concave mirror, and has an opening for the display light to pass through; and

[0116] A light shield is disposed on the inner bottom surface of the housing, forming the optical path space for the display light to travel within the housing.

[0117] The light shield has a plurality of walls surrounding the outer periphery of the display light extending from the display toward the folding mirror.

[0118] At least a portion of one of the plurality of walls, which faces the inner side of the housing, is omitted to form a gap.

[0119] The housing has a plugging part to block the gap.

[0120] (Note 3)

[0121] A head-up display device, comprising:

[0122] A display that emits display light;

[0123] A folding mirror reflects the displayed light;

[0124] A concave mirror that reflects the display light in a manner that projects the display light toward the outside of the head-up display device;

[0125] A housing that houses the display, the folding mirror, and the concave mirror, and has an opening for the display light to pass through; and

[0126] A light shield is disposed on the inner bottom surface of the housing, forming the optical path space for the display light to travel within the housing.

[0127] The light shield includes a mirror mounting frame portion that holds the reflective mirror and is formed in a frame shape.

[0128] The head-up display device is configured such that the folding mirror is assembled onto the mirror mounting frame in a direction along the direction of travel of the display light reflected by the folding mirror.

[0129] Explanation of reference numerals in the attached figures

[0130] 10…Head-up display; 11…Correction mirror; 11C, 11L, 11R…Pressable part; 11a…Reflective surface; 12…Concave mirror; 12a…Reflective surface; 13…Illumination part; 14…Display; 15…Control board; 18…Reflector rotation drive part; 19…Windshield; 30…Housing; 34…Blocking part; 35…Lower housing part; 35b…Inner bottom surface; 35a, 35c, 35d…Hole part; 36…Upper housing part; 36aOpening part; 36b…Light transmittance plate part; 37…Lower cover part; 39L, 39R… 39C…Leaf spring; 40…Light shield; 41…Base plate; 41a~41c…Positioning pin; 42…Opening cylinder; 43L, 43R…Extension; 44C, 44L, 44R…Receiving part; 45L, 45R…Side wall; 47…Reflector mounting frame; 48…Light shield wall; 48a…Slit; 49…Light entrance cylinder; 49a~49d…Wall; 49h…Opening; CP…Intersection; G…Gap; H…Gap; L…Display light; S…Optical path space; SH…Threaded hole; Sc…Screw; Ax…Rotation shaft.

Claims

1. A head-up display device, characterized by comprising: The head-up display device includes: a display that emits display light; a correction mirror that reflects the display light in such a manner that an upper end and a lower end of the display light cross each other; a concave mirror that reflects the display light in such a manner that the display light is projected outside the head-up display device; a housing that is formed of synthetic resin, accommodates the display, the correction mirror, and the concave mirror, and has an opening portion through which the display light passes; and a light shield that is formed of metal, provided to an inner bottom surface of the housing, and forms a light path space in which the display light travels in the housing.

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

3. The head-up display device according to claim 1, wherein the head-up display device includes a mirror rotation driving portion that rotates the concave mirror about a rotation axis extending in a left-right direction as a center, the light shield includes: a bottom plate portion that is located between the correction mirror and the concave mirror and at a position opposite to the inner bottom surface of the housing; and an extension portion that is formed at an end portion of the bottom plate portion on the concave mirror side and protrudes toward a lower side of the concave mirror.

4. The head-up display device according to claim 1, wherein the light shield includes a plurality of wall portions that surround an outer periphery of the display light that travels from the display toward the correction mirror, at least a part of one wall of the plurality of wall portions that is opposite to an inner side surface of the housing is omitted to form a gap, the housing includes a plug portion that plugs the gap.

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

6. The head-up display device according to claim 1, wherein the light shield includes: a bottom plate portion that is located between the correction mirror and the concave mirror and at a position opposite to the inner bottom surface of the housing; and a plurality of positioning portions that are formed at a back surface of the bottom plate portion opposite to the inner bottom surface of the housing and are positioned to positioning portions formed in the inner bottom surface of the housing, at least one of the plurality of positioning portions is located at a position opposite to the correction mirror in a direction along the display light between the correction mirror and the concave mirror. ​

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