Head-up display device

Abstract

A head-up display device is provided with: a first display unit (12a) that transmits light emitted from a first light source (11a) and displays a real image (RI) of a display image; a reflection unit (13) that reflects a first light beam (B1) indicating a real image (RI) toward a windshield (WS); and an optical axis bending member (14) on which the first light beam (B1) is incident and which bends a first optical axis (S1) of the first light beam (B1) at a predetermined angle to form a second optical axis (S2) and emits the second optical axis (S2) to the first display unit (12a), the reflection unit (13) comprising: a first mirror unit (13a) which reflects and folds back the first light beam (B1); and a second mirror section (13b) that reflects the first light beam (B1) from the first mirror section (13a) toward the windshield (WS), the second mirror section (13b) being disposed such that a portion thereof is included in a first virtual region (A1) in which the first display section (12a) is virtually moved in parallel along the second optical axis (S2) to the side opposite the first mirror section (13a). According to the invention, the head-up display device can be made small by bending the light emitted from the light source.

Description

Technical Field

[0001] The present invention relates to a head-up display device that provides required display content to a driver and has a compact structure. Background Art

[0002] Conventionally, for example, a head-up display device described in Patent Document 1 is known. This display device emits display light representing an image onto the windshield of a vehicle, and displays a virtual image of the image by the display light reflected by the windshield. The display device includes a display unit, a folding mirror member, a mirror unit, a motor, a conversion mechanism, a housing, and a control unit, and the display unit emits display light representing a specified image. The display light emitted from the display unit is amplified and reflected by the mirror unit having a concave mirror, so that an observer can see a virtual image in the distance on the windshield.

[0003] Prior Art Documents

[0004] Patent Documents

[0005] Patent Document 1: Japanese Patent Laid-Open No. 2023-148434 Summary of the Invention

[0006] Problems to be Solved by the Invention

[0007] However, in the above-described conventional head-up display device, if the viewing angle of the virtual image is to be increased, the concave mirror or the display unit (such as a liquid crystal display panel in the display unit) becomes larger, resulting in an increase in the size of the housing. Therefore, there is a problem of interference with vehicle parts such as those inside the instrument panel disposed below the head-up display device.

[0008] Therefore, the present invention has been completed in view of the above problems, and an object thereof is to provide a small head-up display device that bends the light emitted from a light source to avoid interference with vehicle parts and the like.

[0009] Means for Solving the Problems

[0010] The present invention relates to a head-up display device 1 having an emission port 17. By emitting display light from the emission port 17 to a light-transmitting member WS, at least a real image RI of a display image represented by the display light can be seen by a driver of a vehicle C. The head-up display device includes: a first display unit 12a having a first display element, which transmits light emitted by a first light source 11a for the real image RI and displays the real image RI of the display image; a reflection unit 13 that reflects at least a first light beam B1 representing the real image RI displayed on the first display unit 12a toward the light-transmitting member WS; and an optical axis bending member 14 disposed between the first light source 11a and the first display unit 12a along the optical path of the first light beam B1, which receives the first light beam B1 of the first light source 11a and bends a first optical axis S1 in the first light beam B1 at a predetermined angle to become a second optical axis S2 and emits it to the first display unit 12a. The reflection unit 13 includes: a first mirror unit 13a that reflects and turns back the first light beam B1; and a second mirror unit 13b that reflects the first light beam B1 from the first mirror unit 13a toward the emission port 17, and the second mirror unit 13b is configured such that a part of the second mirror unit 13b is included in a first virtual region A1 formed by virtually and parallelly moving the first display unit 12a along the second optical axis S2 to the side opposite to the first mirror unit 13a.

[0011] Advantages of the Invention

[0012] According to the present invention, a small head-up display device can be provided that does not interfere with vehicle parts or the like disposed below the head-up display device even when the viewing angle of the display unit is increased. Description of the Drawings

[0013] Figure 1 FIG. is a diagram showing the configuration of a head-up display device according to a first embodiment of the present invention.

[0014] Figure 2 FIG. is an example diagram showing the configuration of a head-up display device without an optical axis bending member.

[0015] Figure 3 FIG. is a diagram showing a first case of extra space generated in the head-up display device according to the first embodiment of the present invention due to the presence of an optical axis bending member.

[0016] Figure 4 FIG. is a diagram showing a second case of extra space generated in the head-up display device according to the first embodiment of the present invention due to the presence of an optical axis bending member.

[0017] Figure 5 FIG. is a diagram showing the configuration of a head-up display device according to a second embodiment of the present invention.

[0018] Explanation of symbols

[0019] A1: 1st virtual area; A2: 2nd virtual area; B, b: light; B1: 1st light; B2: 2nd light; C: vehicle; DR: driver; F1: 1st optical focus; F2: 2nd optical focus; RI: real image (1st display image); S, s: optical axis; S1: 1st optical axis; S2: 2nd optical axis; VI: virtual image (2nd display image); WS: windshield; X: vehicle parts; 1: HUD device; 1 0a: 1st PGU; 10b: 2nd PGU; 11a: 1st light source; 11b: 2nd light source; 12a: 1st display unit; 12b: 2nd display unit; 13: reflecting unit; 13a: 1st mirror unit; 13b: 2nd mirror unit; 14: optical axis bending component; 15: control unit; 16: outer casing; 17: opening unit; 18: cover glass; 131: 1st correction mirror; 132: 2nd correction mirror; 133: concave mirror. DETAILED DESCRIPTION

[0020] (First embodiment of the present invention)

[0021] use Figures 1 to 4 The HUD device 1 of this embodiment allows a driver DR to see a real image RI inside the vehicle through the windshield WS and a virtual image VI outside the vehicle through the windshield WS.

[0022] Figure 1 1 is a diagram showing the configuration of the HUD device 1 according to the present embodiment. Figure 1In this case, the HUD device 1 includes a first image generation unit (hereinafter referred to as the first PGU (PGU: Picture Generation Unit)) 10a, a second image generation unit (hereinafter referred to as the second PGU) 10b, a reflection unit 13, and a control unit 15, and they are housed in a housing 16. The first PGU 10a at least includes: a first light source 11a that emits light in, for example, the visible wavelength region; a first display unit 12a that transmits the light emitted from the first light source 11a and displays a real image (first display image) RI of a display image formed in front of the driver DR; and an optical axis bending member 14 that bends the first optical axis S1 of the first light beam B1 emitted from the first light source 11a at a predetermined angle to form a second optical axis S2. The second PGU 10b at least includes: a second light source 11b that emits light in, for example, the visible wavelength region; and a second display unit 12b that transmits the light emitted from the second light source 11b and displays a virtual image (second display image) VI of a display image formed in front of the driver DR. The reflection unit 13 reflects the first light beam B1 representing the display image displayed on the first display unit 12a and the second light beam B2 representing the display image displayed on the second display unit 12b toward the windshield WS (light-transmitting member). The control unit 15 controls the display contents and display switching of the first display unit 12a and the second display unit 12b. An opening 17 (light exit) for emitting the first light beam B1 and the second light beam B2 is provided in the housing 16, and a cover glass 18 for protecting the interior is disposed at the opening 17. The windshield WS is an example of a light-projecting member, and the opening 17 is an example of a light exit.

[0023] In addition, Figure 1 In this case, the first light beam B1 is represented by a dashed line, and the second light beam B2 is represented by a one-dot chain line. Further, Figure 1 In this case, actually, an infinite number of light beams (display lights) are emitted from the first display unit 12a and the second display unit 12b. However, here, the light beam of the strongest light that is emitted from the center of the first display unit 12a and passes through the center of the eye box is represented as the representative light beam by the first light beam B1, and the light beam of the strongest light that is emitted from the center of the second display unit 12b and passes through the center of the eye box is represented as the representative light beam by the second light beam B2.

[0024] The HUD device 1 is positioned below the windshield WS of the vehicle C (e.g., inside the instrument panel (hereinafter referred to as the instrument panel)). It emits a first light beam B1 and a second light beam B2, projecting them onto the windshield WS. The first light beam B1 is generated by the first light source 11a and the first display unit 12a within the HUD device 1, while the second light beam B2 is generated by the second light source 11b and the second display unit 12b. The first light beam B1 emitted from the first display unit 12a and the second light beam B2 emitted from the second display unit 12b pass through the reflector 13, exit from the opening 17 of the housing 16, and then through the cover glass 18 onto the windshield WS. The driver DR of the vehicle C observes the first light beam B1 reflected from the windshield WS and sees a real image RI on the inside of the vehicle, i.e., on the near side of the windshield WS from the driver DR's perspective. The driver DR of the vehicle C observes the second light beam B2 reflected from the windshield WS and sees a virtual image VI on the outside of the vehicle, i.e., on the far side of the windshield WS from the driver DR's perspective.

[0025] As Figure 1 The real image RI shown, for example, displays entertainment content, assistants or agents supporting the driver DR, and characters presenting these, on the near front side of the windshield WS in the driver DR's perspective. In addition, as a virtual image VI, for example, vehicle information such as the speed and engine speed of the vehicle C, path navigation displays such as turn-by-turn navigation or maps, blind spot indicators, speeding warnings, and other warning displays that are highly necessary for the driver DR to be reminded. Through these displays, a driving environment that reduces the need for line of sight movement and eye focus adjustment can be provided. In addition to the text or icons representing this information, the real image RI and the virtual image VI also include a background portion, which, from the plane perspective of the driver DR, is, for example, roughly rectangular.

[0026] Figure 1In the first PGU 10a shown, the first light source 11a is, for example, a light-emitting diode that emits light in the visible wavelength region and is mounted on a wiring board, and emits white light. The first display unit 12a is provided closer to the opening 17 side than the first light source 11a on the optical path, and has a thin-film transistor (TFT) type first display element (not shown) that forms display light representing an arbitrary image according to a control signal transmitted from the control unit 15. An optical axis bending member 14 is disposed between the first light source 11a and the first display unit 12a. It receives the first light beam B1 from the first light source 11a and bends the first optical axis S1 of the strongest light in the first light beam B1 at a specified angle to become the second optical axis S2 and emits it to the first display unit 12a. The optical axis bending member 14 may be any member that can bend the first optical axis S1 of the first light beam B1 emitted from the first light source 11a. For example, a prism, a mirror, a direct turning film (DFT), etc. may be used. The functions and effects when the optical axis bending member 14 is provided will be described in detail later.

[0027] In addition, Figure 1 In the second PGU 10b shown, the second light source 11b is, for example, a light-emitting diode that emits light in the visible wavelength region and is mounted on a wiring board, and emits white light. The second display unit 12b is provided closer to the opening 17 side than the second light source 11b on the optical path, and has a TFT type second display element (not shown) that forms display light representing an arbitrary image according to a control signal transmitted from the control unit 15.

[0028] In addition, in the first PGU 10a and the second PGU 10b, in addition to the above, optical components such as a condenser lens, a cylindrical lens, a diffusion plate, and a polarizing plate may be disposed at arbitrary positions on the rear stage side of the first light source 11a and the second light source 11b, respectively.

[0029] Figure 1 In the reflection unit 13, it includes a first mirror unit 13a and a second mirror unit 13b. The first mirror unit 13a includes: a first correction mirror 131 that reflects the first light beam B1 emitted from the first display unit 12a to the second correction mirror 132; and a second correction mirror 132 that reflects the first light beam B1 emitted from the first correction mirror 131 to the second mirror unit 13b. The surfaces of the first correction mirror 131 and the second correction mirror 132 are mirror surfaces and are in a complex free-form surface shape in order to correct image distortion seen by the driver DR. In addition, the second correction mirror 132 is, for example, a semi-reflection mirror that allows the second light beam B2 representing the virtual image VI displayed on the second display unit 12b to pass through. The second light beam B2 that has passed through the second correction mirror 132 directly enters the second mirror unit 13b (concave mirror 133).

[0030] The second mirror unit 13b includes at least a concave mirror 133, whose surface is a mirror surface, and reflects the first light ray B1 reflected and turned back by the first mirror unit 13a and the second light ray B2 transmitted through the second correction mirror 132 toward the opening 17. The concave mirror 133 is rotatably provided and rotates according to the eye position of the driver DR, arbitrarily changing the emission directions of the first light ray B1 and the second light ray B2, thereby adjusting the position of the image. In particular, when the first light ray B1 displays a real image RI and the second light ray B2 displays a virtual image VI, there are times when it is desired to make the angles of their display surfaces different (for example, the virtual image VI is displayed inclined with respect to the road surface, and the real image RI is displayed in a state perpendicular to the road surface). Through such rotational driving adjustment, the display images can be respectively displayed at angles suitable for the real image RI and the virtual image VI.

[0031] As Figure 1 shown, the first correction mirror 131 is disposed at a position approximately the same height as the position of the first PGU 10a, and reflects the first light ray B1 emitted from the first display unit 12a in a substantially horizontal direction in a substantially vertical direction toward the second correction mirror 132 disposed above the first correction mirror 131. Here, the height in the present invention is Figure 1 the up-and-down direction, and is the distance in the up-and-down direction of the vehicle C. The second correction mirror 132 reflects the first light ray B1 from a substantially vertical direction reflected by the first correction mirror 131 in a substantially horizontal direction back and forth toward the concave mirror 133 disposed at a position approximately the same height as the position of the second correction mirror 132. The concave mirror 133 is disposed above the position of the first PGU 10a, and reflects the first light ray B1 from a substantially horizontal direction reflected by the second correction mirror 132 upward toward the opening 17. Then, the first light ray B1 reflected by the concave mirror 133 exits through the cover glass 18 to the windshield WS, so that the driver DR sees the display image represented by the first light ray B1 as the real image RI.

[0032] At this time, the first correction mirror 131 is disposed closer to the opening 17 side than the first PGU 10a on the optical path of the first light ray B1, and is disposed closer to the first PGU 10a side than the first optical focus F1 of the imaging optical system including the windshield WS, the second correction mirror 132, and the concave mirror 133.

[0033] In addition, the horizontal direction and the vertical direction are shown based on the horizontal direction and the vertical direction of the vehicle C, but the reference of each direction is not limited thereto. For example, when the device as a whole is inclined at a specified angle while maintaining the relative position relationship of the entire configuration of each optical component according to the internal shape of the instrument panel or the outer shape of the housing 16, such a case is also included in the present invention.

[0034] By making the first PGU10a and the reflecting portion 13 be in such a configuration relationship, the optical path of the first light ray B1 forms a roughly U-shape, so that the housing 16 can be miniaturized. In addition, by locating the first optical focus F1 closer to the opening portion 17 than the first correction mirror 131, the real image RI can be displayed at any suitable position in front of the driver DR. That is, if the first optical focus F1 is located closer to the first PGU10a than the first correction mirror 131, the first optical focus F1 will be away from the second correction mirror 132. As the degree of distance increases, the real image RI will be displayed at a position closer to the driver DR and in a larger size. Therefore, it is very difficult for the driver DR to see the real image RI clearly. That is, the first optical focus F1 is preferably close to the second correction mirror 132. In the HUD device 1 of this embodiment, as Figure 1 As shown, the reflecting portion 13 is arranged so that the first optical focus F1 is located at least between the first correction mirror 131 and the second correction mirror 132 .

[0035] Furthermore, the second display unit 12b of the second PGU 10b is arranged closer to the opening 17 than the second optical focus F2 of the imaging optical system including the windshield WS and the concave mirror 133 on the optical path of the second light ray B2.

[0036] With this configuration, when the first light source 11a is illuminated, the first light beam B1 emitted from the first PGU 10a is reflected by the first correction mirror 131, the second correction mirror 132, the concave mirror 133, and the windshield WS, allowing the driver DR to see a real image RI on the inside of the vehicle through the windshield WS. Furthermore, when the second light source 11b is illuminated, the second light beam B2 emitted from the second PGU 10b is transmitted through the second correction mirror 132, reflected by the concave mirror 133, and the windshield WS, allowing the driver DR to see a virtual image VI on the outside of the vehicle through the windshield WS.

[0037] The control unit 15 cooperatively controls the first PGU10a and the second PGU10b to turn on / off the first light source 11a, turn on / off the second light source 11b, control the display content of the first display unit 12a, control the display content of the second display unit 12b, etc., thereby generating the first light beam B1 emitted from the first PGU10a and the second light beam B2 emitted from the second PGU10b.

[0038] Here, the operation and effects of the optical axis bending member 14 will be described in detail. Figure 2 This is a diagram showing an example of the configuration of the HUD device 1 when the optical axis bending member 14 is not provided.

[0039] Figure 2In [the figure], the first PGU 10a is disposed below the concave mirror 133. The optical axis S of the light beam B emitted from the first light source 11a is the light beam with the strongest light intensity in the first light source 11a, and is the light in the direction consistent with the normal direction of the circuit board in the chip-type LED. In addition, the optical axis s of the light beam b emitted from the first display unit 12a is called the chief ray (Gut Ray). It passes through the center of the first light beam B1 emitted from the first display unit 12a and becomes the principal axis of the light entering the eyes of the driver DR. Figure 2 In the first PGU 10a shown [in the figure], since it does not have the optical axis bending member 14, the optical axis S of the light beam B and the optical axis s of the light beam b are substantially the same (aligned linearly). In this case, as Figure 2 shown [in the figure], if it is necessary to dispose the vehicle part X (prescribed part) within the instrument panel below the first PGU 10a, the vehicle part X will interfere with the first PGU 10a, and thus it is necessary to move the first PGU 10a upward. When the first PGU 10a is moved upward, the first PGU 10a may interfere with the concave mirror 133, making it difficult to layout the respective optical components.

[0040] Therefore, in the HUD device 1 of the present embodiment, as Figure 1 shown [in the figure], in the first PGU 10a, an optical axis bending member 14 is disposed between the first light source 11a and the first display unit 12a. The first light beam B1 from the first light source 11a is incident thereon, and the first optical axis S1 of the strongest light in the first light beam B1 is bent at a prescribed angle and emitted as the second optical axis S2 to the first display unit 12a. That is, the first light source 11a and the first display unit 12a are disposed such that the first optical axis S1 and the second optical axis S2 intersect in a "V" shape, and the light is refracted at the vertex portion of the "V". As described above, the optical axis bending member 14 is formed of, for example, a transmissive synthetic resin, and a prism (light guide) formed in a triangle having a prescribed angle between the light receiving surface and the light emitting surface can be used. By setting the disposition position of the optical axis bending member 14 to the vertex portion of the "V", that is, to a position above the first PGU 10a compared with Figure 2 the case [where there is no optical axis bending member], an extra space can be generated above the first light source 11a corresponding to the starting end portion position of the "V". By disposing the concave mirror 133 such that a part of it is included in this extra space, the space of the housing 16 can be utilized efficiently.

[0041] Figure 3 is a diagram showing the first case of the extra space generated in the HUD device 1 of the present embodiment due to the presence of the optical axis bending member 14. As Figure 3As shown, when the optical axis bending member 14 receives the first light beam B1 from the first light source 11a and bends the first optical axis S1 in the first light beam B1 into a "V" shape to become the second optical axis S2 and emits it to the first display unit 12a, the concave mirror 133 can be arranged in the following state: a part of it is included in the moving area (designated as the first virtual area A1) when the first display unit 12a is virtually translated in parallel along the second optical axis S2 to the side opposite to the first correction mirror 131. That is, compared with the case of Figure 2 the first PGU 10a can be arranged closer to the concave mirror 133.

[0042] In addition, at the same time, as Figure 3 shown, the vehicle part X can be arranged in the following state: a part of it interferes with the moving area (designated as the second virtual area A2) when the circuit board on which the first light source 11a is arranged is virtually translated in parallel along the second optical axis S2 to the first display unit 12a side. That is, compared with the case of Figure 2 the vehicle part X can be arranged to be closer to the upper first PGU 10a and the upper part can enter the extra space generated below the "V" shape.

[0043] In addition, as Figure 3 shown, the first light source 11a is partially or entirely arranged on the side opposite to the concave mirror 133 with the second optical axis S2 (including the extension line of the second optical axis S2) as the boundary. That is, ideally, most of the concave mirror 133 is arranged above the second optical axis S2, and most of the first light source 11a is arranged below the second optical axis S2.

[0044] Figure 4 is a diagram showing the second case of the extra space generated in the HUD device 1 of the present embodiment due to the presence of the optical axis bending member 14. Figure 4 In this case, the angle formed by the first optical axis S1 and the second optical axis S2 is smaller than that in the case of Figure 3 and the vertex position of the "V" shape is shifted, so as to increase the difference between the optical path length of the first light beam B1 along the first optical axis S1 and the optical path length of the first light beam B1 along the second optical axis S2 in the first PGU 10a. At this time, the concave mirror 133 is arranged such that a part of it interferes with the extension line obtained by virtually extending the second optical axis S2 to the side opposite to the first correction mirror 131. By adopting such a structure, compared with the case of Figure 3 the extra space generated below the "V" shape is larger, and the vehicle part X can be arranged at the required position without affecting the viewing angle size.

[0045] In addition, Figures 1 to 4The HUD device 1 shown is configured to display a display image of a real image RI with the first light beam B1 emitted from the first PGU 10a, and a display image of a virtual image VI with the second light beam B2 emitted from the second PGU 10b. However, it may also be configured to include only the first PGU 10a without including the second PGU 10b. In this case, the driver DR can see only the real image RI near the front side of the windshield WS.

[0046] As described above, the HUD device 1 of the present embodiment includes: a first display unit 12a that transmits the light emitted from the first light source 11a for the real image RI and displays the real image RI of the display image; a reflection unit 13 that reflects at least the first light beam B1 representing the real image RI displayed on the first display unit 12a toward the windshield WS; and an optical axis bending member 14 that is disposed between the first light source 11a and the first display unit 12a along the optical path of the first light beam B1, receives the first light beam B1 of the first light source 11a, and bends the first optical axis S1 in the first light beam B1 at a specified angle to become a second optical axis S2 and emits it to the first display unit 12a. The reflection unit 13 includes: a first mirror unit 13a that reflects and turns back the first light beam B1; and a second mirror unit 13b that reflects the first light beam B1 from the first mirror unit 13a toward the opening 17. The second mirror unit 13b is configured such that a part of the second mirror unit 13b is included in a first virtual region A1 formed by virtually moving the first display unit 12a parallel to the first mirror unit 13a along the second optical axis S2 in the opposite direction. Therefore, the optical path of the first light beam B1 that reaches the first display unit 12a from the first light source 11a via the optical axis bending member 14 is bent into a "V" shape. By moving the first light source 11a located on the starting end side of the "V" shape downward, the entire first PGU 10a can be disposed closer to the concave mirror 133. In addition, since extra space is formed below the "V" shape, this extra space can be utilized as a space for disposing the upper part of the vehicle component X. Thus, even if the size of the first display unit 12a becomes relatively large, the enlargement of the entire housing 16 of the HUD device 1 can be suppressed, and interference with the vehicle component X disposed below the HUD device 1 can be avoided.

[0047] In addition, as needed, the first light source 11a is disposed on the side opposite to the concave mirror 133 with respect to the second optical axis S2. Therefore, the first light source 11a and the concave mirror 133 are disposed one above the other, and thus the miniaturization of the entire HUD device 1 in the vertical direction can be surely achieved.

[0048] Furthermore, as needed, at least a part of the concave mirror 133 is disposed on the second optical axis S2. Therefore, a part of the concave mirror 133 overlaps with the second optical axis S2, and thus the miniaturization of the entire HUD device 1 in the vertical direction can be surely achieved.

[0049] In addition, as required, the vehicle part X of the vehicle C is arranged such that a part thereof interferes with a second virtual region A2 formed by virtually moving the circuit board on which the first light source 11a is to be arranged parallel to the first display unit 12a side along the second optical axis S2. Therefore, a configuration can be achieved in which the upper part of the vehicle part X of the vehicle C enters the redundant space formed below the "V" shape, and thus the miniaturization of the entire HUD device 1 in the vertical direction can be surely achieved.

[0050] In addition, as required, the second mirror unit 13b is a concave mirror having a curved surface. Therefore, the light that travels from the lower side along the "U" shaped optical path from the first display unit 12a via the first mirror unit 13a to the second mirror unit 13b can be surely reflected toward the opening 17.

[0051] In addition, as required, the first mirror unit 13a includes a second correction mirror 132, and a second display unit 12b is further provided. The second display unit 12b is arranged on the side opposite to the reflection surface of the second correction mirror 132 of the first mirror unit 13a, includes a second display element, transmits the light emitted by the second light source 11b for the virtual image VI, and displays the virtual image VI of the display image. The second correction mirror 132 of the first mirror unit 13a transmits the second light beam B2 representing the virtual image VI displayed on the second display unit 12b, and the concave mirror 133 of the second mirror unit 13b reflects the second light beam B2 toward the windshield WS. Thus, the virtual image VI of the display image can be seen, and therefore, the HUD device 1 that can switch between displaying the real image RI and the virtual image VI can be achieved.

[0052] (Second Embodiment of the Present Invention)

[0053] Use Figure 5 The HUD device 1 of the present embodiment will be described. Figure 5 This is a diagram showing the configuration of the HUD device 1 of the present embodiment. The HUD device 1 of the first embodiment is configured such that the first mirror unit 13a includes the first correction mirror 131 and the second correction mirror 132, while the HUD device 1 of the present embodiment is as Figure 5 shown, and is configured such that the first mirror unit 13a includes only one correction mirror (the second correction mirror 132).

[0054] Figure 5In the HUD device 1 shown, the first light beam B1 emitted from the first PGU 10a is reflected by the second correction mirror 132 toward the concave mirror 133, and is reflected by the concave mirror 133 toward the opening 17, allowing the driver DR to see the display image of the real image RI. The second light beam B2 emitted from the second PGU 10b passes through the second correction mirror 132 serving as a half mirror and enters the concave mirror 133, and is reflected by the concave mirror 133 toward the opening 17, allowing the driver DR to see the display image of the virtual image VI. At this time, the first display unit 12a of the first PGU 10a is arranged on the side closer to the first light source 11a than the position of the first optical focus F1 of the imaging optical system including the windshield WS, the second correction mirror 132, and the concave mirror 133. In addition, the second display unit 12b of the second PGU 10b is arranged on the side closer to the opening 17 than the position of the second optical focus F2 of the imaging optical system including the windshield WS and the concave mirror 133.

[0055] In addition, in the first PGU 10a, similarly to the case of the first embodiment, it includes an optical axis bending member 14 that bends the first optical axis S1 of the first light beam B1 emitted from the first light source 11a at a predetermined angle to become the second optical axis S2, so that the entire first PGU 10a can be arranged closer to the concave mirror 133. In addition, since an extra space is formed below the first PGU 10a, this extra space can be utilized as a space for arranging the upper part of the vehicle part X to enter.

[0056] In addition, Figure 5 The HUD device 1 shown is configured such that the first light beam B1 emitted from the first PGU 10a displays the display image of the real image RI, and the second light beam B2 emitted from the second PGU 10b displays the display image of the virtual image VI. However, it may also be configured to have only the first PGU 10a without the second PGU 10b.

[0057] As described above, in the HUD device 1 of the present embodiment, by adopting a configuration without the first correction mirror 131, a smaller HUD device 1 can be realized.

Claims

1. A head-up display device, characterized in that, The head-up display device has an emission port, and by emitting display light from the emission port to a light-transmitting member, a driver of a vehicle can see a first display image represented by the display light. Moreover, the head-up display device includes: A first display unit that includes a first display element, allows light emitted from a first light source to pass through, and displays the first display image; A reflection unit that reflects at least first light rays representing the first display image displayed on the first display unit toward the light-transmitting member; and An optical axis bending member that is disposed between the first light source and the first display unit along the optical path of the first light rays, receives the first light rays of the first light source, and bends a first optical axis in the first light rays at a specified angle to be emitted as a second optical axis to the first display unit. The reflection unit includes: A first mirror unit that reflects and turns back the first light rays; and A second mirror unit that reflects the first light rays from the first mirror unit toward the emission port. The second mirror unit is configured such that: A part of the second mirror unit is included in a first virtual region formed by virtually moving the first display unit parallel to the second optical axis to the side opposite to the first mirror unit.

2. The head-up display device according to claim 1, wherein: The first light source is disposed on the side opposite to the second mirror unit with respect to the second optical axis.

3. The head-up display device according to claim 1, wherein: At least a part of the second mirror unit is disposed on the second optical axis.

4. The head-up display device according to claim 1, wherein: A specified part of the vehicle is configured such that a part thereof interferes with a second virtual region formed by virtually moving a circuit board on which the first light source is disposed parallel to the second optical axis toward the first display unit side.

5. The head-up display device according to claim 1, wherein: The second mirror unit is a concave mirror having a curved surface.

6. The head-up display device according to claim 5, wherein: The first mirror unit includes a correction mirror. The head-up display device is further provided with a second display unit that is disposed on the side opposite to the reflection surface of the correction mirror of the first mirror unit, includes a second display element, allows light emitted from a second light source to pass through, and displays a second display image. Second light rays representing the second display image displayed on the second display unit are transmitted through the correction mirror of the first mirror unit, and the concave mirror of the second mirror unit reflects the second light rays toward the light-transmitting member, so that the second display image can be seen.

7. The head-up display device according to any one of claims 1 to 5, wherein: The first display image is a real image.

8. The head-up display device according to claim 6, wherein: The first display image is a real image, and the second display image is a virtual image.

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